HOUSTON LIGHTING & POWER CO
S-4/A, 1996-10-15
ELECTRIC SERVICES
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<PAGE>   1
 
   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON OCTOBER 15, 1996
    
 
   
                                                      REGISTRATION NO. 333-11329
    
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                             ---------------------
   
                                AMENDMENT NO. 1
    
   
                                       TO
    
 
                                    FORM S-4
                          REGISTRATION STATEMENT UNDER
                           THE SECURITIES ACT OF 1933
                             ---------------------
 
                        HOUSTON LIGHTING & POWER COMPANY
                        HOUSTON INDUSTRIES INCORPORATED
             (Exact name of Registrant as specified in its charter)
                             ---------------------
 
<TABLE>
<S>                                 <C>                                 <C>
               TEXAS                                4911                             74-0694415
               TEXAS                                4911                             74-1885573
  (State or other jurisdiction of       (Primary Standard Industrial              (I.R.S. Employer
   incorporation or organization)       Classification Code Number)             Identification No.)
                                                                         HUGH RICE KELLY
                                                              SENIOR VICE PRESIDENT, GENERAL COUNSEL
                                                                     AND CORPORATE SECRETARY
                1111 LOUISIANA                                            1111 LOUISIANA
             HOUSTON, TEXAS 77002                                      HOUSTON, TEXAS 77002
                (713) 207-1111                                            (713) 207-1111
  (Address, including zip code, and telephone       (Name, address, including zip code, and telephone number,
  number, including area code, of Registrant's                              including
         principal executive offices)                            area code, of agent for service)
</TABLE>
 
                             ---------------------
                                   COPIES TO:
 
<TABLE>
<S>                                              <C>
               STEPHEN A. MASSAD                                         GERRY OSTERLAND
             BAKER & BOTTS, L.L.P.                                  JONES, DAY, REAVIS & POGUE
                ONE SHELL PLAZA                                        555 WEST 5TH STREET
                 910 LOUISIANA                                              SUITE 4600
             HOUSTON, TEXAS 77002                                 LOS ANGELES, CALIFORNIA 90013
</TABLE>
 
                             ---------------------
     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE OF THE SECURITIES TO THE
PUBLIC:  as soon as practicable after the effective date of this Registration
Statement and the effective time of the merger of NorAm Energy Corp. with and
into HI Merger, Inc. or Houston Lighting & Power Company, as the case may be
(the "NorAm Merger"), as described in the Agreement and Plan of Merger, dated as
of August 11, 1996 (the "Merger Agreement"), attached as Appendix A to the Joint
Proxy Statement/Prospectus forming a part of this Registration Statement.
     If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box.  / /
                             ---------------------
                        CALCULATION OF REGISTRATION FEE
 
   
<TABLE>
<CAPTION>
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------
                                                                                      PROPOSED
                                                                      PROPOSED        MAXIMUM
                                                     AMOUNT           MAXIMUM        AGGREGATE       AMOUNT OF
           TITLE OF EACH CLASS OF                     TO BE        OFFERING PRICE     OFFERING      REGISTRATION
        SECURITIES TO BE REGISTERED               REGISTERED(4)     PER UNIT(5)       PRICE(5)         FEE(6)
- ------------------------------------------------------------------------------------------------------------------
<S>                                            <C>                <C>             <C>             <C>
Common Stock, without par value, of Houston
  Lighting & Power Company(1)...............   315,402,570 shares      $21.13      $6,664,453,948    $2,298,088
- ------------------------------------------------------------------------------------------------------------------
Purchase Rights(2)(3).......................       315,402,570           --              --              --
- ------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------
</TABLE>
    
 
   
(1) If the Second Alternative Merger (as defined in the Joint Proxy
    Statement/Prospectus) is effected in lieu of the Basic Mergers (as defined
    in the Joint Proxy Statement/Prospectus) pursuant to the Merger Agreement,
    then (a) Common Stock, without par value, of Houston Industries Incorporated
    ("HI Common Stock") (including associated preference stock purchase rights)
    will be issued to stockholders of NorAm Energy Corp. ("NorAm") rather than
    Common Stock, without par value, of Houston Lighting & Power Company
    ("HL&P") and (b) no new shares will be issued to the stockholders of Houston
    Industries Incorporated ("HI").
    
   
(2) Preference (or preferred) stock purchase rights associated with the Common
    Stock of HL&P (or HI Common Stock) pursuant to the Rights Agreement dated
    July 11, 1990 between HI and Texas Commerce Bank National Association, as
    Rights Agent.
    
   
(3) The preference (or preferred) stock purchase rights are issued with the
    common stock for no separate consideration, therefore, no separate fee is
    payable.
    
   
(4) Includes 258,235,447 shares to be issued in the merger of HI into HL&P
    (based upon the estimated number of shares of HI Common Stock which will be
    outstanding at the effective time of the merger of HI into HL&P (the
    "Estimated HI Common Stock Outstanding Number")) and up to 57,167,123 shares
    to be issued in the NorAm Merger (based upon the product of (a) one-half of
    the estimated number of shares of Common Stock, par value $0.625 per share
    ("NorAm Common Stock"), of NorAm which will be outstanding at the effective
    time of the NorAm Merger, assuming conversion of all outstanding NorAm
    6 1/4% Convertible Junior Subordinated Debentures (the "Estimated NorAm
    Common Stock Outstanding Number"), and (b) 0.7529).
    
   
(5) The registration fee was computed pursuant to Rule 457(f) under the
    Securities Act of 1933, as amended, by adding (a) the product of the
    Estimated HI Common Stock Outstanding Number and $21.875 (the average of the
    high and low sales prices reported in the consolidated reporting system for
    HI Common Stock on August 30, 1996) and (b) the product of the Estimated
    NorAm Common Stock Outstanding Number and $14.6875 (the average of the high
    and low sales prices reported in the consolidated reporting system for NorAm
    Common Stock on August 30, 1996), and subtracting therefrom the product of
    one-half of the Estimated NorAm Common Stock Outstanding Number and $16.00.
    
   
(6) The registration fee of $2,298,088 was previously paid.
    
                             ---------------------
     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
                                [HI LETTERHEAD]
 
   
October   , 1996
    
 
To Our Shareholders:
 
   
     You are cordially invited to attend a Special Meeting of Shareholders of
Houston Industries Incorporated ("HI"), which will be held in the Auditorium of
Houston Industries Plaza, 1111 Louisiana Street, Houston, Texas on Wednesday,
December 11, 1996, at 2:00 p.m., Houston time.
    
 
   
     At the Special Meeting, shareholders will be asked to approve and adopt an
Agreement and Plan of Merger (the "Merger Agreement") among HI, its subsidiaries
Houston Lighting & Power Company ("HL&P") and HI Merger, Inc. ("Merger Sub"),
and NorAm Energy Corp. ("NorAm"). Pursuant to the Merger Agreement,
    
 
          - HI will merge into HL&P, as a result of which each outstanding share
     of HI common stock will be converted into one share of common stock of the
     surviving corporation, which will be renamed "Houston Industries
     Incorporated" ("Houston") and will continue to conduct HL&P's electric
     utility business under HL&P's name, and
 
          - NorAm will merge into Merger Sub, as a result of which NorAm will
     become a wholly owned subsidiary of Houston.
 
The Merger Agreement also provides that one of two alternative merger structures
could be used rather than the above two mergers in certain circumstances. The
term "Transaction" refers to the business combination between HI and NorAm,
regardless of the structure used to implement the combination.
 
   
     In the Transaction, each outstanding share of NorAm common stock will be
converted into either cash or Houston common stock. The cash amount per share of
NorAm common stock will be $16.00 (subject to increase if the Transaction closes
after May 11, 1997). The number of shares of Houston common stock issued per
share of NorAm common stock will be not less than 0.6154 shares nor more than
0.7529 shares. (The actual number will depend upon the average closing price of
HI common stock on the New York Stock Exchange during a specified period prior
to the closing date of the Transaction.) The value (based on the average closing
price) of the Houston common stock issued per share of NorAm common stock will
be $16.00 per share if the average price of HI common stock is greater than or
equal to $21.25 and less than or equal to $26.00; the value will be more or less
than $16.00 if the average price is outside that range. Each NorAm stockholder
will be entitled to elect to receive either cash or Houston common stock.
However, elections may be prorated in order that the total number of cash
election shares and the total number of stock election shares will be
approximately equal.
    
 
     In connection with the Transaction, T. Milton Honea, Robert C. Hanna, O.
Holcombe Crosswell and Joseph M. Grant, who are currently directors of NorAm,
will become directors of Houston at the effective time of the Transaction.
 
     The Transaction and related matters are described more fully in the
accompanying Joint Proxy Statement/Prospectus. A copy of the Merger Agreement is
attached to the Joint Proxy Statement/Prospectus as Appendix A.
 
     YOUR BOARD OF DIRECTORS BELIEVES THAT THE MERGER AGREEMENT, WHICH WAS
APPROVED UNANIMOUSLY BY THE BOARD, IS IN THE BEST INTERESTS OF HI AND RECOMMENDS
THAT YOU VOTE FOR ADOPTION AND APPROVAL OF THE MERGER AGREEMENT. In addition,
the Board of Directors has received the opinion of CS First Boston Corporation
that the consideration to be paid to holders of NorAm common stock was fair from
a financial
<PAGE>   3
 
   
point of view to HI at the date of such opinion. Approval and adoption of the
Merger Agreement require the affirmative vote of the holders of two-thirds of
the outstanding shares of HI common stock. Approval of the Merger Agreement will
constitute approval of the Transaction and the other transactions contemplated
by the Merger Agreement, including the election of the four directors named
above.
    
 
     You are urged to read carefully the Joint Proxy Statement/Prospectus and
the Appendices in their entirety for a complete description of the Transaction
and the Merger Agreement. Whether or not you plan to be at the Special Meeting
of Shareholders, please be sure to date, sign and return the proxy card in the
enclosed envelope as promptly as possible so that your shares may be represented
at the meeting and voted in accordance with your wishes. Your vote is important
regardless of the number of shares you own.
 
                                          Sincerely,
 
                                          Don D. Jordan
                                          Chairman, Chief Executive Officer and
                                          President
<PAGE>   4
 
                        HOUSTON INDUSTRIES INCORPORATED
                            HOUSTON INDUSTRIES PLAZA
                             1111 LOUISIANA STREET
                              HOUSTON, TEXAS 77002
 
                   NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
   
                          TO BE HELD DECEMBER 11, 1996
    
 
TO THE SHAREHOLDERS:
 
   
     NOTICE IS HEREBY GIVEN that a Special Meeting of Shareholders of Houston
Industries Incorporated, a Texas corporation ("HI"), will be held in the
Auditorium of Houston Industries Plaza, 1111 Louisiana Street, Houston, Texas on
Wednesday, December 11, 1996, at 2:00 p.m., Houston time, to vote upon adoption
and approval of the Agreement and Plan of Merger (the "Merger Agreement"), dated
as of August 11, 1996, among HI, its subsidiaries Houston Lighting & Power
Company ("HL&P") and HI Merger, Inc. ("Merger Sub"), and NorAm Energy Corp.
("NorAm"), which is described in the attached Joint Proxy Statement/Prospectus.
Pursuant to the Merger Agreement,
    
 
          - HI will merge into HL&P, as a result of which each outstanding share
     of HI common stock will be converted into one share of common stock of the
     surviving corporation, which will be renamed "Houston Industries
     Incorporated" ("Houston") and will continue to conduct HL&P's electric
     utility business under HL&P's name, and
 
          - NorAm will merge into Merger Sub, as a result of which NorAm will
     become a wholly owned subsidiary of Houston.
 
The Merger Agreement also provides that one of two alternative merger structures
could be used rather than the above two mergers in certain circumstances. The
term "Transaction" refers to the business combination between HI and NorAm,
regardless of the structure used to implement the combination.
 
   
     As part of the Transaction, T. Milton Honea, Robert C. Hanna, O. Holcombe
Crosswell and Joseph M. Grant, who are currently directors of NorAm, will be
elected as directors of Houston effective as of the effective time of the
Transaction.
    
 
     The Transaction and related matters are described more fully in the
accompanying Joint Proxy Statement/Prospectus. A copy of the Merger Agreement is
attached to the Joint Proxy Statement/Prospectus as Appendix A.
 
   
     Only HI shareholders of record at the close of business on October 18, 1996
are entitled to notice of and to vote at the Special Meeting.
    
 
     Your vote is important -- as is the vote of every shareholder -- and the
Board of Directors of HI appreciates the cooperation of shareholders in
directing proxies to vote at the meeting. It is important that your shares be
represented at the meeting by your signing and returning the enclosed proxy card
in the accompanying envelope as promptly as possible, whether or not you expect
to be present in person.
 
     You may revoke your proxy at any time by following the procedures set forth
in the accompanying Joint Proxy Statement/Prospectus.
 
                                          By order of the Board of Directors
 
                                          Hugh Rice Kelly
                                          Corporate Secretary
 
Houston, Texas
   
October   , 1996.
    
<PAGE>   5
 
                               [NORAM LETTERHEAD]
 
   
October   , 1996
    
 
To Our Stockholders:
 
   
     You are cordially invited to attend a Special Meeting of Stockholders of
NorAm Energy Corp. ("NorAm"), which will be held in
Houston, Texas on Wednesday, December 11, 1996, at      a.m., Houston time.
    
 
   
     At the Special Meeting, stockholders will be asked to approve and adopt an
Agreement and Plan of Merger (the "Merger Agreement") among NorAm, Houston
Industries Incorporated ("HI") and HI's subsidiaries Houston Lighting & Power
Company ("HL&P") and HI Merger, Inc. ("Merger Sub"), which provides that NorAm
will merge into Merger Sub and as a result will become a wholly owned subsidiary
of Houston (as defined below).
    
 
     The Merger Agreement also provides that HI will merge into HL&P, as a
result of which each outstanding share of HI common stock will be converted into
one share of common stock of the surviving corporation, which will be renamed
"Houston Industries Incorporated" ("Houston") and will continue to conduct
HL&P's electric utility business under HL&P's name. The Merger Agreement further
provides that one of two alternative merger structures could be used in certain
circumstances. The term "Transaction" refers to the business combination between
HI and NorAm, regardless of the structure used to implement the combination.
 
   
     In the Transaction, each outstanding share of NorAm common stock will be
converted into either cash or Houston common stock. The cash amount per share of
NorAm common stock will be $16.00 (subject to increase if the Transaction closes
after May 11, 1997). The number of shares of Houston common stock issued per
share of NorAm common stock will be not less than 0.6154 shares nor more than
0.7529 shares. (The actual number will depend upon the average closing price of
HI common stock on the New York Stock Exchange during a specified period prior
to the closing date of the Transaction.) The value (based on the average closing
price) of the Houston common stock issued per share of NorAm common stock will
be $16.00 per share if the average price of HI common stock is greater than or
equal to $21.25 and less than or equal to $26.00; the value will be more or less
than $16.00 if the average price is outside that range. Each NorAm stockholder
will be entitled to elect to receive either cash or Houston common stock.
However, elections may be prorated in order that the total number of cash
election shares and the total number of stock election shares will be
approximately equal.
    
 
     In connection with the Transaction, T. Milton Honea, Robert C. Hanna, O.
Holcombe Crosswell and Joseph M. Grant, who are currently directors of NorAm,
will become directors of Houston at the effective time of the Transaction.
 
     The Transaction and related matters, including the merger consideration,
are described more fully in the accompanying Joint Proxy Statement/Prospectus. A
copy of the Merger Agreement is attached to the Joint Proxy Statement/Prospectus
as Appendix A.
 
     YOUR BOARD OF DIRECTORS BELIEVES THAT THE TRANSACTION, WHICH WAS APPROVED
UNANIMOUSLY BY THE BOARD, IS IN THE BEST INTERESTS OF NORAM AND RECOMMENDS THAT
YOU VOTE FOR ADOPTION AND APPROVAL OF THE MERGER
<PAGE>   6
 
AGREEMENT. In addition, the Board of Directors has received the opinion of
Merrill Lynch, Pierce, Fenner & Smith Incorporated that the consideration to be
received by holders of NorAm common stock pursuant to the Transaction, taken as
a whole, was fair to such stockholders from a financial point of view as of the
date of such opinion. Approval and adoption of the Merger Agreement require the
affirmative vote of the holders of a majority of the outstanding shares of NorAm
common stock. Approval of the Merger Agreement will constitute approval of the
Transaction and the other transactions contemplated by the Merger Agreement.
 
     You are urged to read carefully the Joint Proxy Statement/Prospectus and
the Appendices in their entirety for a complete description of the Transaction
and the Merger Agreement. Whether or not you plan to be at the Special Meeting
of Stockholders, please be sure to date, sign and return the proxy in the
enclosed envelope as promptly as possible so that your shares may be represented
at the meeting and voted in accordance with your wishes. Your vote is important
regardless of the number of shares you own. PLEASE DO NOT SEND STOCK
CERTIFICATES WITH YOUR PROXY CARDS.
 
                                          Sincerely,
 
                                          T. Milton Honea
                                          Chairman of the Board, President
                                          and Chief Executive Officer
<PAGE>   7
 
                               NORAM ENERGY CORP.
                               1600 SMITH STREET
                              HOUSTON, TEXAS 77002
 
                   NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
   
                        TO BE HELD ON DECEMBER 11, 1996
    
 
TO THE STOCKHOLDERS:
 
   
     NOTICE IS HEREBY GIVEN that a Special Meeting of Stockholders of NorAm
Energy Corp., a Delaware corporation ("NorAm"), will be held in
                         Houston, Texas on Wednesday, December 11, 1996, at
     a.m., Houston time, to vote upon adoption and approval of the Agreement and
Plan of Merger (the "Merger Agreement"), dated as of August 11, 1996, among
NorAm, Houston Industries Incorporated ("HI") and HI's subsidiaries Houston
Lighting & Power Company ("HL&P") and HI Merger, Inc. ("Merger Sub"), whereby
NorAm will merge into Merger Sub and as a result of which NorAm will become a
wholly owned subsidiary of Houston (as defined below).
    
 
     The Merger Agreement is described in the attached Joint Proxy
Statement/Prospectus. The Merger Agreement also provides that HI will merge into
HL&P, as a result of which each outstanding share of HI common stock will be
converted into one share of common stock of the surviving corporation, which
will be renamed "Houston Industries Incorporated" ("Houston") and will continue
to conduct HL&P's electric utility business under HL&P's name. The Merger
Agreement further provides that one of two alternative merger structures could
be used in certain circumstances. The term "Transaction" refers to the business
combination between HI and NorAm, regardless of the structure used to implement
the combination.
 
     In connection with the Transaction, T. Milton Honea, Robert C. Hanna, O.
Holcombe Crosswell and Joseph M. Grant, who are currently directors of NorAm,
will be elected as directors of Houston effective as of the effective time of
the Transaction.
 
     The Transaction and related matters, including the merger consideration,
are described more fully in the accompanying Joint Proxy Statement/Prospectus. A
copy of the Merger Agreement is attached to the Joint Proxy Statement/Prospectus
as Appendix A.
 
   
     Only NorAm stockholders of record at the close of business on October 18,
1996 are entitled to notice of and to vote at the Special Meeting.
    
 
     We hope you will be represented at the meeting by signing and returning the
enclosed proxy card in the accompanying envelope as promptly as possible,
whether or not you expect to be present in person. Your vote is important -- as
is the vote of every stockholder -- and the Board of Directors of NorAm
appreciates the cooperation of stockholders in directing proxies to vote at the
meeting. PLEASE DO NOT SEND STOCK CERTIFICATES WITH YOUR PROXY CARDS.
 
     Your proxy may be revoked at any time by following the procedures set forth
in the accompanying Joint Proxy Statement/Prospectus.
 
                                          By order of the Board of Directors
 
                                          Hubert Gentry, Jr.
                                          Secretary
 
Houston, Texas
   
October   , 1996.
    
<PAGE>   8
 
   
***************************************************************************
*                                                                         *
*  INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A  *
*  REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED     *
*  WITH THE SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT  *
*  BE SOLD NOR MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE        *
*  REGISTRATION STATEMENT BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT    *
*  CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY     *
*  NOR SHALL THERE BE ANY SALE OF THESE SECURITIES IN ANY JURISDICTION    *
*  IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR TO   *
*  REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH    *
*  JURISDICTION.                                                          *
*                                                                         *
***************************************************************************
    

 
   
                  SUBJECT TO COMPLETION DATED OCTOBER 15, 1996
    
                        HOUSTON INDUSTRIES INCORPORATED
                        HOUSTON LIGHTING & POWER COMPANY
                               NORAM ENERGY CORP.
 
                        JOINT PROXY STATEMENT/PROSPECTUS
 
   
     This Joint Proxy Statement/Prospectus relates to an Agreement and Plan of
Merger, dated as of August 11, 1996 (the "Merger Agreement"), among Houston
Industries Incorporated ("HI"), its subsidiaries, Houston Lighting & Power
Company ("HL&P") and HI Merger, Inc. ("Merger Sub"), and NorAm Energy Corp.
("NorAm"). The Merger Agreement provides for
    
 
          - the merger of HI into HL&P (the "HI/HL&P Merger"), as a result of
     which each outstanding share of HI common stock will be converted into one
     share of common stock of HL&P, which will be renamed "Houston Industries
     Incorporated" ("Houston") and will continue to conduct HL&P's electric
     utility business under HL&P's name, and
 
          - the merger of NorAm into Merger Sub (the "NorAm Merger," and
     together with the HI/HL&P Merger, the "Basic Mergers"), as a result of
     which NorAm will become a wholly owned subsidiary of Houston and the
     outstanding shares of common stock of NorAm will be converted into the
     right to receive cash or Houston common stock as more fully described
     herein. See "The Transaction -- Merger Consideration."
 
     The Merger Agreement also provides that one of two alternative merger
structures (the "Alternative Mergers") could be used rather than the Basic
Mergers in certain circumstances. See "The Transaction -- The Alternative
Mergers." The term "Transaction" refers to the business combination between HI
and NorAm, whether implemented using the Basic Mergers or one of the Alternative
Mergers.
 
   
     HL&P has filed a registration statement pursuant to the Securities Act of
1933 (the "Securities Act") covering up to 315,402,570 shares of its common
stock, without par value ("Houston Common Stock"), issuable in connection with
the Transaction. Each share includes an associated preference stock purchase
right ("Houston Right"). This Joint Proxy Statement/Prospectus constitutes the
Prospectus filed as a part of the registration statement and is being furnished
to stockholders of HI and NorAm in connection with the solicitation of proxies
by the respective Boards of Directors of HI and NorAm for use at their
respective special meetings of stockholders (or any adjournment or postponement
thereof), both scheduled to be held on December 11, 1996 (the "HI Special
Meeting" and the "NorAm Special Meeting" and, collectively, the "Special
Meetings").
    
 
   
     HI common stock is listed for trading on the New York Stock Exchange (the
"NYSE") under the symbol "HOU," and HL&P will make application to have Houston
Common Stock listed for trading on the NYSE under the same symbol. On October
  , 1996, the average of the high and low sales prices of HI common stock and
NorAm common stock, as reported on the NYSE composite tape, were $          and
$          per share, respectively.
    
 
THE SECURITIES TO BE ISSUED IN CONNECTION WITH THE TRANSACTION HAVE NOT BEEN
 APPROVED OR DISAPPROVED BY THE SECURITIES AND EXCHANGE COMMISSION OR ANY
  STATE SECURITIES COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION
   OR ANY STATE SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY
     OF THIS JOINT PROXY STATEMENT/PROSPECTUS. ANY REPRESENTATION TO THE
     CONTRARY IS A CRIMINAL OFFENSE.
                             ---------------------
   This Joint Proxy Statement/Prospectus and the accompanying forms of proxy
   
 are first being mailed to stockholders of HI and NorAm on or about October   ,
                                     1996.
    
                             ---------------------
     The date of this Joint Proxy Statement/Prospectus is October   , 1996.
<PAGE>   9
 
                             AVAILABLE INFORMATION
 
     HI, HL&P and NorAm are subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and, in
accordance therewith, file reports, proxy statements and other information with
the Securities and Exchange Commission (the "SEC"). Such reports and other
information may be inspected and copied at the public reference facilities
maintained by the SEC at Room 1024, Judiciary Plaza, 450 Fifth Street, N.W.,
Washington D.C. 20549, and at the following Regional Offices of the SEC:
Northwest Atrium Center, 500 West Madison Street, Suite 1400, Chicago, Illinois
60661; and Seven World Trade Center, Suite 1300, New York, New York 10048.
Copies of such material can also be obtained from the Public Reference Section
of the SEC at 450 Fifth Street, N.W., Washington, D.C. 20549 at prescribed
rates. The SEC maintains a Web site that contains reports, proxy and information
statements and other information filed electronically by HI, HL&P and NorAm with
the SEC which can be accessed over the Internet at http://www.sec.gov. In
addition, reports, proxy statements and other information filed by HI can be
inspected at the offices of the NYSE, 20 Broad Street, New York, New York 10005,
and at the offices of The Chicago Stock Exchange, 440 S. LaSalle Street,
Chicago, Illinois 60605. Such material filed by NorAm can be inspected at the
offices of the NYSE.
 
   
     HL&P and HI have filed with the SEC a registration statement on Form S-4
(together with all amendments, supplements and exhibits thereto, the
"Registration Statement") under the Securities Act with respect to the Houston
Common Stock or, if the Second Alternative Merger (as hereinafter defined) is
effected in lieu of the Basic Mergers, HI Common Stock (as defined below),
including associated preference stock purchase rights, to be issued pursuant to
the Merger Agreement. The information contained herein with respect to HI and
its subsidiaries (other than HL&P) has been provided by HI, the information with
respect to HL&P has been provided by HL&P and the information with respect to
NorAm and its subsidiaries has been provided by NorAm. This Joint Proxy
Statement/Prospectus does not contain all of the information set forth in the
Registration Statement and the exhibits thereto, certain parts of which are
omitted in accordance with the rules and regulations of the SEC. The
Registration Statement and any amendments hereto, including exhibits filed as a
part thereof, are available for inspection and copying as set forth above.
Statements contained in this Joint Proxy Statement/Prospectus or in any document
incorporated in this Joint Proxy Statement/Prospectus by reference as to the
contents of any contract or other document referred to herein or therein are not
necessarily complete, and in each instance reference is made to the copy of such
contract or other document filed as an exhibit to the Registration Statement or
such other document, each such statement being qualified in all respects by such
reference.
    
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
   
     THIS JOINT PROXY STATEMENT/PROSPECTUS INCORPORATES CERTAIN DOCUMENTS BY
REFERENCE WHICH ARE NOT PRESENTED HEREIN OR DELIVERED HEREWITH. THESE DOCUMENTS
(OTHER THAN EXHIBITS TO SUCH DOCUMENTS UNLESS SUCH EXHIBITS ARE SPECIFICALLY
INCORPORATED BY REFERENCE) ARE AVAILABLE TO ANY PERSON, INCLUDING ANY BENEFICIAL
OWNER, UPON REQUEST FROM, IN THE CASE OF DOCUMENTS RELATING TO HI OR HL&P,
ROBERT E. SMITH, INVESTOR SERVICES, 1111 LOUISIANA, HOUSTON, TEXAS 77002,
TELEPHONE NUMBER (713) 207-3060, AND IN THE CASE OF DOCUMENTS RELATING TO NORAM,
RANDY BURKHALTER, DIRECTOR OF INVESTOR RELATIONS, 1600 SMITH STREET, 32ND FLOOR,
HOUSTON, TEXAS 77002, TELEPHONE NUMBER (713) 654-7502. IN ORDER TO ENSURE TIMELY
DELIVERY OF THESE DOCUMENTS, ANY REQUEST SHOULD BE MADE BY DECEMBER 3, 1996.
    
 
     HI, HL&P and NorAm hereby undertake to provide, without charge, to each
person, including any beneficial owner of common stock, without par value, of HI
("HI Common Stock") or common stock, par value $0.625 per share, of NorAm
("NorAm Common Stock"), to whom a copy of this Joint Proxy Statement/Prospectus
has been delivered, upon the written or oral request of any such person, a copy
of any and all of the documents referred to below which have been or may be
incorporated herein by reference, other than exhibits to such documents, unless
such exhibits are specifically incorporated herein by reference. Requests for
such documents should be directed to one of the persons indicated in the
immediately preceding paragraph.
 
                                        2
<PAGE>   10
 
   
     The following documents, which have been previously filed by HI (File No.
1-7629), HL&P (File No. 1-3187) and NorAm (File No. 1-3751) with the SEC
pursuant to the Exchange Act, are hereby incorporated herein by reference:
    
 
   
          (1) HI and HL&P's Combined Annual Report on Form 10-K for their
     respective fiscal years ended December 31, 1995;
    
 
   
          (2) HI and HL&P's Combined Quarterly Report on Form 10-Q for the
     period ended March 31, 1996;
    
 
   
          (3) HI and HL&P's Combined Quarterly Report on Form 10-Q for the
     period ended June 30, 1996;
    
 
   
          (4) HI and HL&P's Combined Current Report on Form 8-K dated August 11,
     1996;
    
 
          (5) HI Proxy Statement for the 1996 Annual Meeting of Shareholders
     held on May 22, 1996;
 
          (6) The descriptions of each of (a) the HI Common Stock, which is
     contained in HI's Registration Statement on Form 8-A dated January 14,
     1977, as amended by Form 8 dated July 14, 1986, and (b) the rights ("HI
     Rights") to purchase one two-hundredth of a share of Series A Preference
     Stock, no par value, of HI associated with the HI Common Stock, which is
     contained in HI's Registration Statement on Form 8-A dated July 16, 1990;
 
          (7) NorAm's Annual Report on Form 10-K for its fiscal year ended
     December 31, 1995;
 
          (8) NorAm's Quarterly Report on Form 10-Q for the period ended March
     31, 1996;
 
          (9) NorAm's Quarterly Report on Form 10-Q for the period ended June
     30, 1996;
 
          (10) NorAm's Current Reports on Form 8-K dated February 7, 1996, June
     10, 1996 and August 11, 1996; and
 
          (11) NorAm Proxy Statement for the 1996 Annual Meeting of Stockholders
     held on May 14, 1996.
 
     All documents and reports filed by HI, HL&P or NorAm pursuant to Section
13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this Joint Proxy
Statement/Prospectus and prior to the date that the Transaction is consummated
shall be deemed to be incorporated by reference herein and to be a part hereof
from the respective dates of filing of such documents or reports. All
information appearing in this Joint Proxy Statement/Prospectus or in any
document incorporated herein by reference is not necessarily complete and is
qualified in its entirety by the information and financial statements (including
notes thereto) appearing in the documents incorporated herein by reference and
should be read together with such information and documents.
 
     Any statement contained herein or in a document all or a portion of which
is incorporated or deemed to be incorporated by reference herein shall be deemed
to be modified or superseded for purposes of this Joint Proxy
Statement/Prospectus to the extent that a statement contained herein (or in any
subsequently filed document which also is or is deemed to be incorporated by
reference herein) modifies or supersedes such statement. Any such statement so
modified or superseded shall not be deemed to constitute a part of this Joint
Proxy Statement/Prospectus except as so modified or superseded.
 
     No person is authorized to give any information or to make any
representation not contained in this Joint Proxy Statement/Prospectus, and, if
given or made, such information or representation must not be relied upon as
having been authorized. This Joint Proxy Statement/Prospectus does not
constitute an offer to sell, or a solicitation of an offer to purchase, any of
the securities offered by this Joint Proxy Statement/Prospectus, or the
solicitation of a proxy, in any jurisdiction in which, or to any person to whom,
it is unlawful to make such offer or solicitation of an offer or proxy
solicitation. Neither the delivery of this Joint Proxy Statement/Prospectus nor
any distribution of the securities offered hereby shall, under any
circumstances, create any implication that the information contained herein is
correct as of any time subsequent to the date hereof or that there has been no
change in the affairs of HI, HL&P or NorAm since the date hereof.
 
                                        3
<PAGE>   11
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
AVAILABLE INFORMATION.................................................................     2
INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE.......................................     2
SUMMARY...............................................................................     6
  The Special Meetings................................................................     6
  The Transaction.....................................................................     7
  The Companies.......................................................................    12
  Comparative Per Share Prices of HI and NorAm Common Stock...........................    13
  Selected Historical Financial Information for HI....................................    14
  Selected Historical Financial Information for NorAm.................................    15
  Summary Pro Forma Combined Financial Information....................................    16
  Comparative Per Share Data of HI and NorAm..........................................    16
THE COMPANIES.........................................................................    17
  Houston Industries Incorporated.....................................................    17
  NorAm Energy Corp. .................................................................    17
THE MEETINGS..........................................................................    19
  HI Special Meeting..................................................................    19
  NorAm Special Meeting...............................................................    19
  Quorum..............................................................................    19
  Vote Required.......................................................................    20
  Record Date; Stock Entitled to Vote.................................................    20
  Voting of Proxies...................................................................    20
  Revocation of Proxies...............................................................    20
  Solicitation of Proxies.............................................................    21
  Security Ownership of Certain Persons...............................................    21
THE TRANSACTION.......................................................................    22
  General.............................................................................    22
  The HI/HL&P Merger..................................................................    22
  The NorAm Merger....................................................................    22
  Merger Consideration................................................................    23
  Election Procedure..................................................................    25
  Proration...........................................................................    27
  Procedures for Exchange of Certificates; the Payment Fund...........................    28
  Fractional Shares...................................................................    29
  The Alternative Mergers.............................................................    29
  Corporate Structure.................................................................    31
  Background of the Transaction.......................................................    32
  HI's Reasons for the Transaction....................................................    33
  NorAm's Reasons for the Transaction.................................................    35
  Recommendations of the Boards of Directors..........................................    36
  Opinion of HI's Financial Advisor...................................................    37
  Opinion of NorAm's Financial Advisor................................................    41
  Certain Federal Income Tax Consequences.............................................    47
  Accounting Treatment................................................................    49
  Funding of Cash Consideration.......................................................    49
  NorAm Employee Matters..............................................................    50
  Interests of Certain Persons in the Transaction.....................................    52
  Amendment of Articles of Incorporation..............................................    54
  Dissenters' Appraisal Rights........................................................    54
  NYSE Listing of Common Stock........................................................    57
  Resales of Houston Common Stock.....................................................    57
</TABLE>
    
 
                                        4
<PAGE>   12
 
   
<TABLE>
<CAPTION>
                                                                                        PAGE
                                                                                        ----
<S>                                                                                     <C>
  Litigation..........................................................................    57
CERTAIN REGULATORY MATTERS............................................................    58
  Antitrust Considerations............................................................    58
  Public Utility Holding Company Act of 1935..........................................    58
  Atomic Energy Act of 1954...........................................................    59
  State Regulatory Matters............................................................    59
  Other Regulatory Matters............................................................    59
CERTAIN PROVISIONS OF THE MERGER AGREEMENT............................................    59
  Conditions to the Transaction.......................................................    59
  Representations and Warranties......................................................    62
  Certain Covenants -- Conduct of Business of NorAm...................................    62
  Certain Covenants -- Conduct of Business of HI and HL&P.............................    66
  Additional Agreements...............................................................    66
  Amendment and Waiver................................................................    67
  Termination.........................................................................    68
  Expenses and Termination Fee........................................................    69
UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS...........................    71
RELATIONSHIPS OF THE PARTIES..........................................................    78
  Prior to the Transaction............................................................    78
  Following the Transaction...........................................................    78
DESCRIPTION OF HOUSTON CAPITAL STOCK..................................................    79
  Common Stock........................................................................    79
  Preferred Stock.....................................................................    80
  Preference Stock....................................................................    81
  Certain Provisions of the Houston Articles of Incorporation and Bylaws..............    81
  Rights Plan.........................................................................    81
COMPARATIVE RIGHTS OF STOCKHOLDERS....................................................    84
  General.............................................................................    84
  Mergers and Other Fundamental Transactions..........................................    84
  Mergers Without Stockholder Approval................................................    85
  Appraisal Rights....................................................................    85
  Amendments to Charter...............................................................    86
  Preference Stock Purchase Rights....................................................    86
  Special Meetings of Stockholders....................................................    86
  Cumulative Voting...................................................................    86
  No Preemptive Rights................................................................    86
  Stockholder Action by Written Consent...............................................    86
  Newly Created Directorships.........................................................    87
  Classification of the Houston Board of Directors....................................    87
  Removal of Directors................................................................    87
EXPERTS...............................................................................    88
LEGAL MATTERS.........................................................................    88
STOCKHOLDER PROPOSALS.................................................................    88
APPENDIX A -- Agreement and Plan of Merger
APPENDIX B -- Opinion of CS First Boston Corporation
APPENDIX C -- Opinion of Merrill Lynch, Pierce, Fenner & Smith Incorporated
APPENDIX D -- Section 262 of the Delaware General Corporation Law
APPENDIX E -- Glossary of Certain Terms Relating to the Transaction
</TABLE>
    
 
                                        5
<PAGE>   13
 
                                    SUMMARY
 
     The following is a summary of certain information contained elsewhere in
this Joint Proxy Statement/Prospectus and does not purport to be complete.
Stockholders are urged to carefully read this Joint Proxy Statement/Prospectus
and the Appendices hereto in their entirety.
 
     Unless otherwise indicated, capitalized terms used in this Joint Proxy
Statement/Prospectus are defined in the Glossary of Certain Terms Relating to
the Transaction attached hereto as Appendix E.
 
                              THE SPECIAL MEETINGS
 
   
MEETINGS OF STOCKHOLDERS...  The HI Special Meeting will be held on December 11,
                             1996 at 2:00 p.m., Houston time, in the Auditorium
                             of Houston Industries Plaza, 1111 Louisiana Street,
                             Houston, Texas.
    
 
   
                             The NorAm Special Meeting will be held on December
                             11, 1996 at
                             a.m., Houston time, in the
                             Houston, Texas.
    
 
MATTERS TO BE CONSIDERED AT
THE SPECIAL MEETINGS.......  At the Special Meetings, stockholders will be asked
                             to approve and adopt the Merger Agreement, which
                             provides for the Transaction.
 
VOTE REQUIRED..............  Approval of the Merger Agreement requires the
                             affirmative vote of the holders of:
 
                             - two-thirds of the outstanding shares of HI Common
                             Stock, and
 
                             - a majority of the outstanding shares of NorAm
                               Common Stock.
 
                             No approval by the holders of outstanding shares of
                             HL&P preferred stock is required to approve the
                             Merger Agreement, and such holders are not entitled
                             to vote on the Merger Agreement.
 
   
RECORD DATE................  Only stockholders of record of HI Common Stock at
                             the close of business on October 18, 1996 (the "HI
                             Record Date") are entitled to notice of and to vote
                             at the HI Special Meeting. On October , 1996, there
                             were        shares of HI Common Stock outstanding.
                             Holders of HI Common Stock are entitled to one vote
                             with respect to the Merger Agreement for each share
                             held.
    
 
   
                             Only stockholders of record of NorAm Common Stock
                             at the close of business on October 18, 1996 (the
                             "NorAm Record Date") are entitled to notice of and
                             to vote at the NorAm Special Meeting. On October
                               , 1996, there were        shares of NorAm Common
                             Stock outstanding. Holders of NorAm Common Stock
                             are entitled to one vote with respect to the Merger
    
                             Agreement for each share held.
 
                                        6
<PAGE>   14
 
                                THE TRANSACTION
 
EFFECT OF THE HI/HL&P
  MERGER...................  In the HI/HL&P Merger, HI will merge into HL&P.
                             HL&P will be the surviving corporation and will be
                             renamed "Houston Industries Incorporated"
                             ("Houston").
 
TREATMENT OF HI COMMON
  STOCK....................  Each share of HI Common Stock (and associated HI
                             Right) outstanding prior to the effective time of
                             the HI/HL&P Merger will be converted into one share
                             of Houston Common Stock (and one associated Houston
                             Right).
 
EFFECT OF THE NORAM
MERGER.....................  In the NorAm Merger, NorAm will merge into Merger
                             Sub. Merger Sub will be the surviving corporation
                             and will be renamed "NorAm Energy Corp." As a
                             result, NorAm will become a wholly owned subsidiary
                             of Houston.
 
TREATMENT OF NORAM
  COMMON STOCK.............  In the Transaction, each share of NorAm Common
                             Stock outstanding immediately prior to the
                             effective time of the Transaction (the "Effective
                             Time") (other than dissenting shares) will be
                             converted into either cash or Houston Common Stock,
                             as elected by the NorAm stockholder but subject to
                             proration as described below.
 
                             The cash amount to be paid per share of NorAm
                             Common Stock will be $16.00. If the Transaction is
                             not consummated by May 11, 1997, the $16.00 cash
                             amount will increase after that date by 2% (simple
                             interest) per quarter until consummation (the "Cash
                             Consideration").
 
   
                             The number of shares of Houston Common Stock to be
                             issued per share of NorAm Common Stock will be not
                             less than 0.6154 shares nor more than 0.7529
                             shares. The actual number of shares will depend
                             upon the average daily closing prices of HI Common
                             Stock on the NYSE during a 20-trading-day period
                             commencing 25 trading days prior to the Closing
                             Date. (The actual number of shares of Houston
                             Common Stock to be issued to NorAm stockholders, as
                             so determined, is called the "Stock
                             Consideration.") Accordingly, the value (based on
                             the average closing price) of the Stock
                             Consideration will be $16.00 per share of NorAm
                             Common Stock if the average price of HI Common
                             Stock is greater than or equal to $21.25 and less
                             than or equal to $26.00; such value will be more or
                             less than $16.00 if the average price is outside
                             that range. Cash will be paid in lieu of fractional
                             shares.
    
 
   
NORAM MERGER ELECTION
  PROCEDURES...............  Each record holder of NorAm Common Stock (other
                             than dissenting shares) will be entitled to elect
                             to receive either Cash Consideration (a "Cash
                             Election") or Stock Consideration (a "Stock
                             Election"), subject to proration as described
                             below. As indicated in the Election Form, each
                             record holder of NorAm Common Stock has a right to
                             elect Cash Consideration or Stock Consideration for
                             each share of NorAm Common Stock held by the
                             holder.
    
 
   
                             All elections are to be made on a form of election
                             and letter of transmittal (the "Election Form") to
                             be mailed to record holders of NorAm Common Stock
                             at least 20 business days prior to the Closing
                             Date. Stockholders may also obtain copies of the
                             Election Form upon request from
                                                                           (the
                             "Ex-
    
 
                                        7
<PAGE>   15
 
   
                             change Agent") either in writing by mail to
                                       , or by telephone at        . HI will
                             issue a public announcement of the anticipated
                             Closing Date as soon as practicable, but in no
                             event less than five trading days prior to the
                             Closing Date. Election Forms must be received by
                             the Exchange Agent at its designated office no
                             later than 5:00 p.m., New York City time, on the
                             trading day immediately preceding the Closing Date
                             (the "Election Deadline"). The shares of NorAm
                             Common Stock of a holder who fails to properly
                             complete and return the Election Form, together
                             with certificates representing such holder's shares
                             of NorAm Common Stock or an appropriate guarantee
                             of delivery of certificates for such shares, to the
                             Exchange Agent by the Election Deadline, or who
                             fails to comply with the election procedures
                             described in this Joint Proxy Statement/ Prospectus
                             and the Election Form, will be deemed by HL&P, in
                             its sole and absolute discretion, to be shares in
                             respect of which either Cash Elections or Stock
                             Elections have been made.
    
 
   
PRORATION..................  If either Cash Elections or Stock Elections are
                             made with respect to more than half the total
                             outstanding shares of NorAm Common Stock, those
                             elections will be adjusted pro rata so that the
                             total number of Cash Election Shares and the total
                             number of Stock Election Shares will be
                             approximately equal. (For this purpose, dissenting
                             shares will be treated as Cash Election shares.)
                             However, HI has the option to change the aggregate
                             amounts of Cash Consideration and Stock
                             Consideration to more closely follow the actual
                             elections of the NorAm stockholders.
    
 
RECOMMENDATIONS OF THE
BOARDS OF DIRECTORS........  The Boards of Directors of HI and NorAm believe
                             that the terms of the Transaction are fair to and
                             in the best interests of their respective
                             stockholders and have unanimously approved the
                             Merger Agreement and the transactions contemplated
                             thereby. THE BOARD OF DIRECTORS OF HI UNANIMOUSLY
                             RECOMMENDS THAT HI STOCKHOLDERS APPROVE THE MERGER
                             AGREEMENT. THE BOARD OF DIRECTORS OF NORAM
                             UNANIMOUSLY RECOMMENDS THAT NORAM STOCKHOLDERS
                             ADOPT THE MERGER AGREEMENT.
 
HI'S REASONS FOR THE
  TRANSACTION..............  HI's Board of Directors believes that the
                             Transaction offers the following significant
                             strategic and financial benefits to HI and its
                             stockholders, as well as to its employees and
                             customers:
 
                             - NorAm brings to the combined companies more than
                               2.1 million additional retail distribution
                               customers (net of its approximately 600,000
                               customers who overlap with HL&P's approximately
                               1.5 million retail customers).
 
                             - NorAm has a fast-growing gas and electric
                               wholesale trading organization, which can be
                               combined with HL&P's electric power expertise to
                               build a leading wholesale energy trading and risk
                               management business.
 
                             - NorAm's international strategy, with its emphasis
                               on gas transmission and distribution, complements
                               HI's international strategy, which is focused on
                               power plant development and acquisition of
                               electric distribution systems.
 
NORAM'S REASONS FOR THE
  TRANSACTION..............  NorAm's Board of Directors believes that the
                             Transaction is the best alternative for achieving
                             the strategic objectives of NorAm and enhancing
                             value for its stockholders because, among other
                             things:
 
                                        8
<PAGE>   16
 
                             - The values to NorAm's stockholders which could be
                               achieved either by NorAm remaining an independent
                               company or choosing other possible alternatives
                               were considered unlikely to equal the value to
                               NorAm's stockholders to be achieved by the
                               Transaction.
 
                             - NorAm's stockholders who receive Stock
                               Consideration can participate in the continued
                               growth of NorAm and HI through their ownership of
                               stock of Houston, a company with greater
                               financial strength, financial flexibility and
                               cash available for investments than NorAm on a
                               stand-alone basis.
 
OPINIONS OF FINANCIAL
ADVISORS...................  CS First Boston Corporation ("CS First Boston") has
                             delivered its written opinion dated August 11, 1996
                             to the Board of Directors of HI that, as of the
                             date of such opinion, the Merger Consideration was
                             fair from a financial point of view to HI.
 
                             Merrill Lynch, Pierce, Fenner & Smith Incorporated
                             ("Merrill Lynch") has delivered its written opinion
                             dated August 11, 1996 to the Board of Directors of
                             NorAm that, as of the date of such opinion, the
                             Merger Consideration to be received by the holders
                             of NorAm Common Stock, taken as a whole, was fair
                             from a financial point of view to the holders of
                             NorAm Common Stock.
 
                             For information on the assumptions made, matters
                             considered and limits of the reviews by CS First
                             Boston and Merrill Lynch, see "The
                             Transaction -- Opinion of HI's Financial Advisor"
                             and "-- Opinion of NorAm's Financial Advisor."
                             Stockholders are urged to read in their entirety
                             the opinions of CS First Boston and Merrill Lynch,
                             attached as Appendices B and C, respectively, to
                             this Joint Proxy Statement/ Prospectus.
 
HOUSTON BOARD OF DIRECTORS
  FOLLOWING THE
  TRANSACTION..............  In connection with the Transaction, T. Milton
                             Honea, Robert C. Hanna, O. Holcombe Crosswell and
                             Joseph M. Grant, who are currently directors of
                             NorAm, will be elected as directors of Houston
                             effective as of the Effective Time.
 
EFFECT OF THE ALTERNATIVE
  MERGERS..................  Pursuant to the Merger Agreement, one of two
                             alternative merger structures could be utilized in
                             lieu of the Basic Mergers under certain
                             circumstances. If HL&P determines that, upon
                             consummation of the Basic Mergers, Houston would
                             not be an exempt "public utility holding company"
                             under the Public Utility Holding Company Act of
                             1935 (the "1935 Act"), NorAm and HI will both be
                             merged into HL&P, with HL&P being the surviving
                             corporation.
 
                             Alternatively, if at the time all conditions to
                             consummating the Transac-
                             tion have been satisfied or waived, the 1935 Act
                             does not constrain the structure of the
                             Transaction, then (i) HI will not merge into HL&P
                             and (ii) NorAm will merge into Merger Sub with
                             Merger Sub being the surviving corporation. In that
                             event, both HL&P and NorAm would be wholly owned
                             subsidiaries of HI.
 
EFFECTIVE TIME OF THE
  TRANSACTION..............  The closing of the Transaction (the "Closing") will
                             occur on the fifth business day after all of the
                             conditions to the Transaction contained in the
                             Merger Agreement have been satisfied or waived or
                             on such other date as to which NorAm and HI
                             mutually agree. The Transaction will become
                             effective promptly after the Closing.
 
                                        9
<PAGE>   17
 
CONDITIONS TO THE
TRANSACTION................  The obligations of HI and NorAm to consummate the
                             Transaction are subject to certain conditions,
                             including:
 
                             - the approval of the stockholders of HI and NorAm;
 
                             - the expiration or termination of the relevant
                               waiting period under the Hart-Scott-Rodino
                               Antitrust Improvements Act of 1976 (the "HSR
                               Act");
 
                             - the receipt of consents and approvals from
                               certain Governmental Entities and third parties;
                               and
 
                             - other conditions customary for transactions of
                               this nature.
 
   
AMENDMENT AND WAIVER.......  The Merger Agreement may be amended at any time
                             before or after stockholder approval. After
                             stockholder approval has been obtained, no
                             amendment which by law requires further approval of
                             stockholders will be made without such further
                             approval.
    
 
   
                             Either HI or NorAm may extend the time for
                             performance of any of the obligations of the other
                             party or may waive compliance with any of the
                             agreements or conditions contained in the Merger
                             Agreement. Neither HI nor NorAm currently has any
                             intention to allow for any such extension or make
                             any such waiver.
    
 
   
REGULATORY MATTERS.........  Consummation of the Transaction is conditioned on
                             the approvals of utility regulatory commissions in
                             Arkansas, Louisiana, Minnesota, Oklahoma and
                             Mississippi under applicable state laws and four
                             municipalities, including the City of Houston,
                             under NorAm's franchises with the municipalities.
                             The required filings and applications have been
                             made in each state and with the City of Houston.
                             Consummation is also conditioned on the expiration
                             or termination of the applicable waiting period
                             under the HSR Act.
    
 
   
                             Houston has filed an application with the SEC
                             requesting an exemption from regulation as a
                             registered public utility holding company under the
                             1935 Act. If the SEC does not grant the exemption,
                             both HI and NorAm will be merged into HL&P pursuant
                             to the First Alternative Merger.
    
 
   
TERMINATION................  The Merger Agreement may be terminated at any time
                             prior to the Effective Time by mutual consent of HI
                             and NorAm. It may also be terminated by either
                             party in certain events, including if the
                             Transaction has not been consummated by August 11,
                             1997 (unless on such date all conditions to the
                             consummation of the Transaction have been fulfilled
                             or are capable of being fulfilled other than the
                             condition that all material required consents,
                             approvals and authorizations of Governmental
                             Entities be obtained, in which case such date will
                             automatically be extended to December 31, 1997).
    
 
                             NorAm may also terminate the Merger Agreement,
                             prior to approval by NorAm's stockholders, if NorAm
                             receives from another party an unsolicited
                             acquisition proposal that is financially superior
                             to the Transaction, subject to certain conditions,
                             including that NorAm's Board of Directors shall
                             have concluded that such action is necessary in
                             order to satisfy its fiduciary duties under
                             applicable law. HI may terminate the Merger
                             Agreement if the Board of Directors of NorAm has
                             recommended to the NorAm stockholders an
                             alternative acquisition proposal.
 
                             Upon termination of the Merger Agreement under
                             certain circumstances, HI or NorAm may be required
                             to pay the other a fee, ranging from $10 million to
                             $35 million in the case of a payment by HI and from
                             $10 million to $75 million in the case of a payment
                             by NorAm.
 
                                       10
<PAGE>   18
 
   
APPRAISAL RIGHTS...........  Under Texas law, HI stockholders will not be
                             entitled to any dissenter's rights in connection
                             with the Transaction. Under Delaware law, NorAm
                             stockholders will be entitled to appraisal rights
                             in connection with the Transaction. A copy of the
                             Delaware statutory provisions regarding appraisal
                             rights is attached hereto as Appendix D and those
                             provisions are described more fully elsewhere
                             herein.
    
 
   
CERTAIN FEDERAL INCOME TAX
  CONSEQUENCES.............  Counsel to HI has opined that each of the mergers
                             in the Transaction will qualify as a reorganization
                             within the meaning of Section 368(a) of the
                             Internal Revenue Code of 1986 (the "Code") and,
                             accordingly, for federal income tax purposes, no
                             gain or loss will be recognized by HI, HL&P, NorAm
                             or Merger Sub as a result of the Transaction.
    
 
                             A citizen or resident of the United States or a
                             domestic corporation (a "U.S. Holder") who holds HI
                             Common Stock and exchanges such stock for Houston
                             Common Stock pursuant to the Transaction will not
                             recognize any gain or loss on such exchange.
 
                             A U.S. Holder who holds NorAm Common Stock and
                             exchanges such stock pursuant to the Transaction
                             solely for Cash Consideration will recognize
                             capital gain or loss in an amount equal to the
                             difference between the amount of Cash Consideration
                             received by such holder and such holder's tax basis
                             in the shares of NorAm Common Stock surrendered
                             therefor. A U.S. Holder of NorAm Common Stock who
                             exchanges NorAm Common Stock pursuant to the
                             Transaction solely for Stock Consideration will not
                             recognize any gain or loss on such exchange. A U.S.
                             Holder of NorAm Common Stock who exchanges NorAm
                             Common Stock pursuant to the Transaction for both
                             Cash Consideration and Stock Consideration
                             generally will realize capital gain or loss in an
                             amount equal to the difference between the fair
                             market value of the Merger Consideration received
                             by such holder and the holder's adjusted tax basis
                             in the shares of NorAm Common Stock surrendered
                             therefor. Such gain, if any, will be recognized,
                             however, only to the extent of the amount of Cash
                             Consideration received by such holder; any loss
                             will not be recognized.
 
ACCOUNTING TREATMENT.......  The acquisition of NorAm will be accounted for as a
                             "purchase" by Houston in accordance with generally
                             accepted accounting principles.
 
INTERESTS OF CERTAIN
PERSONS IN THE
  TRANSACTION..............  In considering the recommendation of the Board of
                             Directors of NorAm with respect to the Transaction,
                             stockholders should be aware that certain members
                             of the Board of Directors of NorAm and certain
                             executive officers of NorAm have interests in the
                             Transaction separate from their interests as NorAm
                             stockholders, including executive severance
                             agreements.
 
COMPARISON OF STOCKHOLDER
  RIGHTS...................  As a result of the Transaction (unless the Second
                             Alternative Merger is implemented), holders of HI
                             Common Stock will become stockholders of Houston.
                             The terms and provisions of Houston Common Stock
                             are substantially similar to those of HI Common
                             Stock.
 
                             As a result of the Transaction, holders of NorAm
                             Common Stock will become stockholders of Houston
                             and will have certain different rights as
                             stockholders of Houston than they had as
                             stockholders of NorAm.
 
                                       11
<PAGE>   19
 
                                 THE COMPANIES
 
     HI is a holding company operating principally in the electric utility
business. HL&P is the principal subsidiary of HI and is engaged in the
generation, transmission, distribution and sale of electric energy. HL&P is the
nation's ninth-largest electric utility in terms of kilowatt-hour sales. HL&P's
service area covers a 5,000-square mile area on the Texas Gulf Coast, including
Houston (the nation's fourth largest city). HL&P serves approximately 1.5
million residential, commercial and industrial customers. The business and
operations of HL&P account for substantially all of HI's income from continuing
operations and common stock equity. Houston Industries Energy, Inc. ("HI
Energy") participates in domestic and foreign power generation projects and
invests in the privatization of foreign electric utilities. Merger Sub is a
direct wholly owned subsidiary of HI incorporated for purposes of the
Transaction. The principal executive offices of HI and HL&P are located at
Houston Industries Plaza, 1111 Louisiana Street, Houston, Texas 77002. HI's
telephone number is (713) 207-3000 and HL&P's telephone number is (713)
207-1111. See "The Companies -- Houston Industries Incorporated."
 
     NorAm is principally engaged in the distribution and transmission of
natural gas, including the gathering, storage and marketing of natural gas.
Through its Entex, Arkla and Minnegasco gas distribution divisions, NorAm is the
nation's third-largest natural gas utility in terms of customers served, serving
over 2.7 million customers in six states. NorAm operates interstate gas pipeline
facilities through NorAm Gas Transmission Company and Mississippi River
Transmission Corporation, natural gas gathering assets in Oklahoma, Louisiana,
Arkansas and Texas and is engaged in various other energy-related businesses,
including natural gas and electric wholesale trading, gas storage, wholesale
electric services and providing unregulated retail energy services to industrial
and large commercial customers. The principal executive offices of NorAm are
located at 1600 Smith Street, 32nd Floor, Houston, Texas 77002, and its
telephone number is (713) 654-5699. See "The Companies -- NorAm Energy Corp."
 
   
FORWARD-LOOKING STATEMENTS
    
 
   
     This Joint Proxy Statement/Prospectus includes forward-looking statements
within the meaning of the Private Securities Litigation Reform Act of 1995.
Although HI and NorAm believe their expectations are based on reasonable
assumptions, no assurance can be given that actual results may not differ
materially from those in the forward-looking statements herein for reasons
including the effects of competition, legislative and regulatory changes,
fluctuations in the weather, the timing and extent of changes in commodity
prices for crude oil, natural gas and interest rates, conditions of the capital
markets and equity markets, and the ability of HI and NorAm to achieve the goals
described in "The Transaction -- HI's Reasons for the Transaction" and
"-- NorAm's Reasons for the Transaction," as well as other factors discussed in
or incorporated by reference into this Joint Proxy Statement/Prospectus.
    
 
                                       12
<PAGE>   20
 
           COMPARATIVE PER SHARE PRICES OF HI AND NORAM COMMON STOCK
 
     HI Common Stock is traded on the NYSE, the Chicago Stock Exchange and the
London Stock Exchange under the symbol "HOU." NorAm Common Stock is traded on
the NYSE under the symbol "NAE." The following table sets forth the high and low
sales prices of HI Common Stock and NorAm Common Stock for the calendar quarters
indicated, as reported in The Wall Street Journal's NYSE Composite Transactions
Reports. It also sets forth certain dividend information.
 
   
<TABLE>
<CAPTION>
                                          HI COMMON STOCK(1)                        NORAM COMMON STOCK
                                  ----------------------------------     -----------------------------------------
                                   MARKET PRICE                               MARKET PRICE
                                  ---------------    DIVIDEND DECLARED      ---------------      DIVIDEND DECLARED
                                  HIGH        LOW        PER SHARE          HIGH        LOW         PER SHARE
                                  ----        ---    ------------------     ----        ---      -----------------
<S>                               <C>        <C>          <C>              <C>         <C>           <C>
1994
First Quarter...................  $23 7/8    $17 3/8      $ 0.375          $ 9         $ 6 3/4        $0.07
Second Quarter..................  $18 5/8    $15          $ 0.375          $ 6 1/2     $ 5 5/8        $0.07
Third Quarter...................  $18 5/16   $16 1/4      $ 0.375          $ 7 3/4     $ 5 3/4        $0.07
Fourth Quarter..................  $18 1/4    $16          $ 0.375          $ 6 1/2     $ 5 1/4        $0.07
1995
First Quarter...................  $20 1/2    $17 11/16    $ 0.375          $ 6         $ 5 1/8        $0.07
Second Quarter..................  $21 7/8    $18 15/16    $ 0.375          $ 6 3/4     $ 5 1/4        $0.07
Third Quarter...................  $22 3/4    $21 1/16     $ 0.375          $ 8 1/8     $ 6 1/4        $0.07
Fourth Quarter..................  $24 1/2    $22 1/16     $ 0.375          $ 9         $ 7 5/8        $0.07
1996
First Quarter...................  $25 5/8    $21 1/2      $ 0.375          $ 9 3/8     $ 7 7/8        $0.07
Second Quarter..................  $24 3/4    $20 1/2      $ 0.375          $11 1/8     $ 8 3/8        $0.07
Third Quarter...................  $24 3/4    $21 1/8      $ 0.375          $14 7/8     $10 1/4        $0.07
Fourth Quarter (through October
    )...........................  $          $            $                $           $              $
</TABLE>
    
 
- ---------------
 
(1) All HI Common Stock data reflect a two-for-one common stock dividend
    distribution in December 1995.
 
   
     The following table sets forth the closing price per share of HI Common
Stock and NorAm Common Stock on the NYSE and the equivalent per share price (as
explained below) of NorAm Common Stock on August 9, 1996, the business day
preceding public announcement of the Transaction, and on October   , 1996:
    
 
   
<TABLE>
<CAPTION>
                                                         HI           NORAM       EQUIVALENT PER
              MARKET PRICE PER SHARE AT:            COMMON STOCK   COMMON STOCK    SHARE PRICE
    ----------------------------------------------  ------------   ------------   --------------
    <S>                                             <C>            <C>            <C>
    August 9, 1996................................    $ 23.625       $ 11.625         $16.00
    October   , 1996..............................    $              $                $
</TABLE>
    
 
     The equivalent per share price of a share of NorAm Common Stock represents
an estimation of the Stock Consideration, assuming that the Effective Time had
occurred on the respective dates set forth in the table above. See "The
Transaction -- Merger Consideration."
 
     Stockholders are advised to obtain current market quotations for HI Common
Stock and NorAm Common Stock. No assurance can be given as to the market price
of HI Common Stock or NorAm Common Stock at, or in the case of Houston Common
Stock after, the Effective Time.
 
DIVIDEND POLICY OF HOUSTON
 
   
     It is currently anticipated that a $1.50 per share annual dividend will be
maintained on Houston Common Stock following consummation of the Transaction.
However, future dividends will be subject to determination based upon the
results of operations and financial condition of Houston, Houston's future
business prospects, any applicable contractual restrictions and such other
factors as the Houston Board of Directors considers relevant.
    
 
                                       13
<PAGE>   21
 
                SELECTED HISTORICAL FINANCIAL INFORMATION FOR HI
 
     The following table sets forth selected financial data for HI for each of
the five fiscal years in the period ended December 31, 1995 and the six months
ended June 30, 1996 and 1995. This data should be read in conjunction with the
financial statements and the related notes incorporated by reference herein. See
"Incorporation of Certain Documents by Reference." Selected unaudited financial
data for the six months ended June 30, 1996 and 1995 for HI include all
adjustments (consisting only of normally recurring accruals) that HI considers
necessary for a fair presentation of consolidated operating results for such
interim periods. Results for the interim periods are not necessarily indicative
of results for the full year. On July 6, 1995, HI closed the sale of its cable
television subsidiary. The operations and net assets of that subsidiary have
been accounted for as discontinued operations.
 
<TABLE>
<CAPTION>
                                                    SIX MONTHS
                                                  ENDED JUNE 30,                       YEAR ENDED DECEMBER 31,
                                               --------------------    --------------------------------------------------------
                                                 1996        1995        1995        1994        1993        1992        1991
                                               --------    --------    --------    --------    --------    --------    --------
                                                               (MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
<S>                                            <C>         <C>         <C>         <C>         <C>         <C>         <C>
Revenues...................................... $1,938.2    $1,745.0    $3,730.2    $3,754.1    $4,083.7    $3,857.9    $3,707.6
                                               --------    --------    --------    --------    --------    --------    --------
Income from continuing operations before
  cumulative effect of change in
  accounting(1)...............................    128.6       157.1       397.4       424.0       440.5       370.0       484.3
Loss from discontinued operations.............                                        (16.5)      (24.5)      (29.5)      (67.5)
Gain on sale of cable television subsidiary...                 90.6       708.1
Cumulative effect of change in
  accounting(2)...............................                                         (8.2)                   94.2
                                               --------    --------    --------    --------    --------    --------    --------
Net income(1)................................. $  128.6    $  247.7    $1,105.5    $  399.3    $  416.0    $  434.7    $  416.8
                                               ========    ========    ========    ========    ========    ========    ========
Earnings per common share(3):
  Continuing operations before cumulative
    effect of change in accounting(1)......... $    .52    $    .63    $   1.60    $   1.72    $   1.69    $   1.43    $   1.88
  Loss from discontinued operations...........                                         (.07)       (.09)       (.11)       (.26)
  Gain on sale of cable television
    subsidiary................................                  .37        2.86
  Cumulative effect of change in
    accounting(2).............................                                         (.03)                    .36
                                               --------    --------    --------    --------    --------    --------    --------
Earnings per common share(1).................. $    .52    $   1.00    $   4.46    $   1.62    $   1.60    $   1.68    $   1.62
                                               ========    ========    ========    ========    ========    ========    ========
Cash dividends declared per common
  share(3)(4)................................. $    .75    $    .75    $   1.50    $   1.50    $  1.875    $   1.49    $   1.48
At period-end:
  Total assets of continuing operations....... $ 12,175    $ 11,526    $ 11,820    $ 10,784    $ 10,868    $ 11,076    $ 10,821
  Net assets of discontinued operations.......                                          619         487         231         170
                                               --------    --------    --------    --------    --------    --------    --------
Total assets.................................. $ 12,175    $ 11,526    $ 11,820    $ 11,403    $ 11,355    $ 11,307    $ 10,991
                                               ========    ========    ========    ========    ========    ========    ========
Common stock equity(5)........................ $  4,052    $  3,444    $  4,124    $  3,369    $  3,274    $  3,285    $  3,232
Long-term obligations including current
  maturities:
  Continuing operations(6).................... $  3,482    $  3,794    $  3,769    $  3,906    $  3,951    $  4,244    $  4,489
  Discontinued operations.....................                                     $    505    $    515    $    740    $    813
</TABLE>
 
- ---------------
 
(1) HI adopted Statement of Position (SOP) 93-6, "Employers' Accounting for
    Employee Stock Ownership Plans," effective January 1, 1994, which had the
    effect of reducing net income while increasing earnings per share. SOP 93-6
    is effective only with respect to financial statements for periods after
    January 1, 1994, and no restatement was permitted for prior periods.
 
(2) The 1994 cumulative effect relates to the change in accounting for
    postemployment benefits. The 1992 cumulative effect relates to the change in
    accounting for revenues.
 
(3) All common share data reflect a two-for-one common stock dividend
    distribution in December 1995.
 
(4) Year ended December 31, 1993 includes five quarterly dividends of $.375 per
    share due to a change in the timing of HI's Board of Directors' declaration
    of dividends. Dividend payout was $1.50 per share for 1993.
 
   
(5) Pursuant to a stock repurchase program, HI had purchased         shares of
    HI Common Stock for $  million from June 30, 1996 through October   , 1996.
    
 
(6) Includes Cumulative Preferred Stock subject to mandatory redemption.
 
                                       14
<PAGE>   22
 
              SELECTED HISTORICAL FINANCIAL INFORMATION FOR NORAM
 
     The following table sets forth selected financial data for NorAm for each
of the five fiscal years in the period ended December 31, 1995 and the six
months ended June 30, 1996 and 1995. This data should be read in conjunction
with the financial statements and the related notes incorporated by reference
herein. See "Incorporation of Certain Documents by Reference." Selected
unaudited financial data for the six months ended June 30, 1996 and 1995 for
NorAm include all adjustments (consisting only of normally recurring accruals)
that NorAm considers necessary for a fair presentation of consolidated operating
results for such interim periods. Results for the interim periods are not
necessarily indicative of results for the full year.
 
   
<TABLE>
<CAPTION>
                                                      SIX MONTHS ENDED
                                                          JUNE 30,                       YEAR ENDED DECEMBER 31,
                                                     -------------------   ----------------------------------------------------
                                                       1996       1995       1995       1994       1993       1992       1991
                                                     --------   --------   --------   --------   --------   --------   --------
<S>                                                  <C>        <C>        <C>        <C>        <C>        <C>        <C>
                                                                  (MILLIONS OF DOLLARS, EXCEPT PER SHARE AMOUNTS)
Revenues............................................ $2,309.0   $1,454.0   $2,964.7   $2,857.9   $2,988.3   $2,782.2   $2,759.2
                                                     --------   --------   --------   --------   --------   --------   --------
Income from continuing operations before
  extraordinary items...............................     63.5       44.9       65.5       51.3       39.9        6.2       16.5
Loss from discontinued operations(1)................                                      (2.1)                (34.8)      (6.9)
Cumulative effect of change in accounting
  principles(2).....................................                                                            (4.9)     (64.4)
Extraordinary item(3)...............................     (4.7)       (.1)        .0       (1.1)      (3.8)    (195.0)        .0
                                                     --------   --------   --------   --------   --------   --------   --------
Net income (loss)................................... $   58.8   $   44.8   $   65.5   $   48.1   $   36.1   $ (228.5)  $  (54.8)
                                                     ========   ========   ========   ========   ========   ========   ========
Earnings (loss) per common share:
  Continuing operations............................. $    .48   $    .33   $    .47   $    .36   $    .26   $   (.01)  $    .08
  Loss from discontinued operations.................                                      (.02)                 (.29)      (.06)
  Cumulative effect of change in accounting
    principles......................................                                                            (.04)      (.56)
  Extraordinary item................................     (.04)       .00        .00       (.01)      (.03)     (1.60)       .00
                                                     --------   --------   --------   --------   --------   --------   --------
Earnings (loss) per common share.................... $    .44   $    .33   $    .47   $    .33   $    .23   $  (1.94)  $   (.54)
                                                     ========   ========   ========   ========   ========   ========   ========
Cash dividends declared per common share............ $    .14   $    .14   $    .28   $    .28   $    .28   $    .48   $   1.08
At period-end:
  Total assets of continuing operations............. $  3,596   $  3,408   $  3,666   $  3,561   $  3,728   $  4,059   $  4,470
  Common stock equity............................... $    788   $    631   $    637   $    587   $    578   $    583   $    818
  Long-term obligations including current
    maturities...................................... $  1,555   $  1,545   $  1,594   $  1,565   $  1,727   $  1,903   $  1,675
</TABLE>
    
 
- ---------------
 
(1) Includes (i) in 1994, a pre-tax loss of $3.3 million, less related tax
    benefit of $1.2 million, associated with the discontinued operations of a
    former savings and loan subsidiary of Entex, (ii) in 1992, pre-tax income of
    $31.4 million, less related tax expense of $66.2 million, associated with
    the discontinued operations and disposal of NorAm's former operations in the
    exploration and production, radio communications, savings and loan and gas
    grill manufacturing businesses and (iii) in 1991, a pre-tax loss of $7.1
    million, less related tax benefit of $.2 million, associated with the
    discontinued operations of NorAm's former exploration and production, gas
    grill manufacturing and radio communications businesses.
 
(2) Represents the after-tax effect of (i) in 1992, the cumulative effect of
    NorAm's adoption of Statement of Financial Accounting Standards No. 112,
    "Employers' Accounting for Postemployment Benefits" and (ii) in 1991, the
    cumulative effect of NorAm's adoption of Statement of Financial Accounting
    Standards No. 109, "Accounting for Income Taxes."
 
   
(3) Represents (i) in the six months ended June 30, 1996 and 1995, and in 1995,
    1994 and 1993, losses recognized upon early extinguishment of debt, less
    taxes and (ii) in 1992, the charge associated with NorAm's discontinuance of
    the application of Statement of Financial Accounting Standards No. 71,
    "Accounting for the Effects of Certain Types of Regulation" to its NorAm Gas
    Transmission Company subsidiary effective December 31, 1992.
    
 
                                       15
<PAGE>   23
 
          SUMMARY PRO FORMA COMBINED FINANCIAL INFORMATION (UNAUDITED)
 
     The following tables set forth certain unaudited pro forma combined
financial information giving effect to the Transaction accounted for as a
purchase in accordance with generally accepted accounting principles. The
information below may not be indicative of the results that actually would have
occurred if the Transaction had been consummated on the dates indicated or which
will be obtained in the future. The summary pro forma financial data for the
periods indicated have been derived from the unaudited pro forma combined
condensed financial statements and related notes appearing elsewhere in this
Joint Proxy Statement/Prospectus.
 
<TABLE>
<CAPTION>
                                                              SIX MONTHS ENDED        YEAR ENDED
                                                               JUNE 30, 1996       DECEMBER 31, 1995
                                                              ----------------     -----------------
                                                                   (MILLIONS OF DOLLARS, EXCEPT
                                                                         PER SHARE AMOUNTS)
<S>                                                           <C>                  <C>
Revenues....................................................      $4,247.2             $ 6,694.9
Income from continuing operations available for common
  stock.....................................................      $  145.1             $   366.8
Earnings per common share from continuing operations........      $    .48             $    1.22
Cash dividends declared per common share....................      $    .75             $    1.50
At period-end:
  Total assets..............................................      $ 17,576                    --
  Long-term obligations including current maturities........      $  6,195                    --
</TABLE>
 
                   COMPARATIVE PER SHARE DATA OF HI AND NORAM
 
     The following tables present comparative per share information for HI and
NorAm on a historical basis and on a pro forma basis assuming that the
Transaction had occurred at the beginning of the periods presented for cash
dividends and earnings per common share purposes and as of June 30, 1996 for
book value per common share purposes. The tables should be read in conjunction
with the financial statements of HI and NorAm incorporated by reference in this
Joint Proxy Statement/Prospectus and the unaudited pro forma combined condensed
financial statements and related notes included elsewhere herein. See "Unaudited
Pro Forma Combined Condensed Financial Statements."
 
   
<TABLE>
<CAPTION>
                                                               SIX MONTHS ENDED       YEAR ENDED
                                                                JUNE 30, 1996      DECEMBER 31, 1995
                                                               ----------------    -----------------
<S>                                                            <C>                 <C>
                                                                 (UNAUDITED)
HI -- HISTORICAL
Book value per common share.................................        $16.36              $ 16.61
Cash dividends per common share.............................           .75                 1.50
Earnings per common share from continuing operations........           .52                 1.60
HI -- PRO FORMA (UNAUDITED)
Book value per common share.................................        $17.62              $ 17.82
Cash dividends per common share.............................           .68                 1.36
Earnings per common share from continuing operations........           .48                 1.22
NORAM -- HISTORICAL
Book value per common share.................................        $ 5.75              $  5.11
Cash dividends per common share.............................           .14                  .28
Earnings per common share from continuing operations........           .48                  .47
NORAM -- EQUIVALENT PRO FORMA(1) (UNAUDITED)
Book value per equivalent common share......................        $11.93              $ 12.07
Cash dividends per equivalent common share..................           .46                  .92
Earnings per equivalent common share from continuing
  operations................................................           .33                  .83
</TABLE>
    
 
- ---------------
 
(1) The NorAm equivalent pro forma per share amounts were calculated by
    multiplying the HI pro forma per share amounts by 0.6772. The 0.6772
    represents the number of shares that a holder of NorAm Common Stock
    receiving Stock Consideration would receive per NorAm share assuming a
    20-trading-day average price of HI Common Stock of $23.625 (the mid-point of
    the $21.25 to $26.00 range).
 
                                       16
<PAGE>   24
 
                                 THE COMPANIES
 
HOUSTON INDUSTRIES INCORPORATED
 
     HI is a holding company operating principally in the electric utility
business. HI is a holding company as defined in the 1935 Act; however, based
upon the intrastate operations of HL&P and the exemptions applicable to the
affiliates of HI Energy, HI is exempt from regulation as a "registered" holding
company under the 1935 Act except with respect to the acquisition of voting
securities of other domestic public utility companies and utility holding
companies.
 
     HOUSTON LIGHTING & POWER COMPANY.  HL&P is the principal subsidiary of HI
and is engaged in the generation, transmission, distribution and sale of
electric energy. HL&P is the nation's ninth-largest electric utility in terms of
kilowatt-hour sales. HL&P's service area covers a 5,000-square mile area on the
Texas Gulf Coast, including Houston (the nation's fourth largest city). HL&P
serves approximately 1.5 million residential, commercial and industrial
customers. HL&P is a member of the Electric Reliability Council of Texas, Inc.
and is interconnected to a transmission grid encompassing most of the State of
Texas. The business and operations of HL&P account for substantially all of HI's
income from continuing operations and common stock equity. HL&P operates under a
certificate of convenience and necessity granted by the Public Utility
Commission of Texas which covers HL&P's present service area and facilities. In
addition, HL&P holds franchises to provide electric service within the
incorporated municipalities in its service territory.
 
     HOUSTON INDUSTRIES ENERGY, INC.  HI formed HI Energy in 1993 to seek
investment opportunities in domestic and foreign power generation projects and
the privatization of foreign electric utilities. HI Energy's major foreign
investments include interests in two Argentine electric utility companies and
two power generation projects being developed in Argentina and India.
Additionally, in May 1996, a subsidiary of HI acquired, as part of a consortium
which acquired a controlling interest, 11.35 percent of the common shares of
Light -- Servicos de Eletricidade S.A., a publicly held Brazilian corporation,
for $392 million.
 
     MERGER SUB.  Merger Sub is a direct wholly owned subsidiary of HI
incorporated in Delaware in August 1996 for purposes of the Transaction. Merger
Sub engages in no other business.
 
NORAM ENERGY CORP.
 
     NorAm is principally engaged in the distribution and transmission of
natural gas, including the gathering, storage and marketing of natural gas.
NorAm is currently organized into five operating units: (i) natural gas
distribution; (ii) interstate pipelines; (iii) wholesale energy marketing; (iv)
retail energy marketing; and (v) natural gas gathering.
 
     NATURAL GAS DISTRIBUTION.  NorAm's natural gas distribution business is
conducted through three divisions, Arkla, Entex and Minnegasco, which
collectively form the nation's third-largest gas distribution operation in terms
of customers served with over 400 billion cubic feet ("Bcf") of annual
throughput to over 2.7 million customers. Through these divisions, NorAm engages
in both the sale and transportation of natural gas. The facilities and terms of
service related to these three divisions are largely regulated by state public
service commissions and municipalities.
 
     INTERSTATE PIPELINES.  NorAm's interstate natural gas pipeline business is
conducted principally through NorAm Gas Transmission Company and Mississippi
River Transmission Corporation, two wholly owned subsidiaries of NorAm, together
with certain subsidiaries and affiliates. Through these subsidiaries and
affiliates, NorAm engages in the transmission, sale and storage of natural gas.
These operations are subject to regulation principally by the Federal Energy
Regulatory Commission ("FERC").
 
     WHOLESALE ENERGY MARKETING.  NorAm's wholesale energy marketing business
principally consists of marketing natural gas and providing risk management
services to natural gas resellers and certain large volume customers. This
business is principally conducted by NorAm Energy Services, Inc., together with
certain affiliates ("NES"). NES is a fast-growing marketer, having increased its
average daily volumes from 0.9 Bcf per day in 1994 to 1.4 Bcf per day in 1995
and 2.1 Bcf per day during the second quarter of 1996. NES has
 
                                       17
<PAGE>   25
 
begun to market electricity in wholesale markets in recent periods. NES's
activities are not generally subject to rate regulation.
 
     RETAIL ENERGY MARKETING.  NorAm's retail energy marketing business is
principally conducted by NorAm Energy Management, Inc. and certain affiliates
("NEM"). NEM was created in 1995 to consolidate the existing unregulated retail
marketing activities of NorAm's distribution companies into one business
segment. NEM is focusing on industrial and large commercial customers. Services
offered to these customers include natural gas supply, electric power services,
management of commodity pricing risks, total energy management, and supply and
financing of gas burning equipment, including inside-the-fence cogeneration.
NEM's activities are not generally subject to traditional cost-of-service
regulation.
 
     NATURAL GAS GATHERING.  NorAm's natural gas gathering activities are
principally carried out by NorAm Field Services Corp. and certain affiliates
("NFS"). NFS operates approximately 3,500 miles of gathering pipelines which
collect gas from more than 200 separate systems located in major producing
fields in Oklahoma, Louisiana, Arkansas and Texas. NFS is implementing plans to
provide additional services including compression, line looping and
administrative services to its customers.
 
     For a more complete description of the businesses of HI and NorAm, see
"Incorporation of Certain Documents by Reference."
 
                                       18
<PAGE>   26
 
                                  THE MEETINGS
HI SPECIAL MEETING
 
   
     The HI Special Meeting will be held on December 11, 1996 at 2:00 p.m.,
Houston time, in the Auditorium of Houston Industries Plaza, 1111 Louisiana
Street, Houston, Texas.
    
 
     At the HI Special Meeting, the stockholders of HI will be asked to consider
and vote upon the approval and adoption of the Merger Agreement. Pursuant to the
terms of the Merger Agreement,
 
          - HI will merge into HL&P, as a result of which each currently
     outstanding share of HI Common Stock will be converted into one share of
     Houston Common Stock, and
 
          - NorAm will merge into Merger Sub, as a result of which NorAm will
     become a wholly owned subsidiary of Houston and the outstanding shares of
     NorAm Common Stock will be converted into the right to receive the Cash
     Consideration or the Stock Consideration, as the holder thereof has elected
     or is deemed to have elected (collectively, the "Merger Consideration").
     See "The Transaction -- Merger Consideration."
 
     In connection with the Transaction, T. Milton Honea, Robert C. Hanna, O.
Holcombe Crosswell and Joseph M. Grant, who are currently directors of NorAm,
will be elected as directors of Houston effective as of the effective time of
the Transaction (the "Effective Time").
 
     In addition, the Merger Agreement provides that one of two alternative
merger structures could be used rather than the Basic Mergers in certain
circumstances. See "The Transaction -- The Alternative Mergers." Approval of the
Merger Agreement will constitute approval of the Transaction, the issuance of up
to 57,167,123 shares of Houston Common Stock to the holders of NorAm Common
Stock and the election of directors. See "The Transaction." A copy of the Merger
Agreement is attached hereto as Appendix A.
 
     THE BOARD OF DIRECTORS OF HI HAS UNANIMOUSLY APPROVED THE MERGER AGREEMENT
AND RECOMMENDS A VOTE FOR ADOPTION AND APPROVAL OF THE MERGER AGREEMENT.
 
NORAM SPECIAL MEETING
 
   
     The NorAm Special Meeting will be held on December 11, 1996 at      a.m.,
Houston time, in the                , Houston, Texas.
    
 
     At the NorAm Special Meeting, stockholders of NorAm will be asked to
approve and adopt the Merger Agreement pursuant to which NorAm will merge into
Merger Sub. As a result, NorAm will become a wholly owned subsidiary of Houston
and the outstanding shares of NorAm Common Stock will be converted into the
right to receive the Merger Consideration.
 
     The Merger Agreement provides that one of two alternative merger structures
could be used rather than the Basic Mergers in certain circumstances. See "The
Transaction -- The Alternative Mergers."
 
     THE BOARD OF DIRECTORS OF NORAM HAS UNANIMOUSLY APPROVED THE MERGER
AGREEMENT AND RECOMMENDS A VOTE FOR ADOPTION AND APPROVAL OF THE MERGER
AGREEMENT.
 
     Pursuant to certain provisions of NorAm's Bylaws, all proxies and ballots
shall be received, and all questions regarding the qualification of voters and
the validity of proxies, and the acceptance or rejection of votes shall be
decided by two inspectors.               and               have been appointed
by the NorAm Board of Directors to serve as Inspectors of Election at the NorAm
Special Meeting.
 
QUORUM
 
     The presence, in person or by proxy, of the holders of a majority of the
outstanding shares of HI Common Stock is necessary to constitute a quorum at the
HI Special Meeting. Similarly, the presence, in person or by proxy, of the
holders of a majority of the outstanding shares of NorAm Common Stock is
necessary to constitute a quorum at the NorAm Special Meeting.
 
                                       19
<PAGE>   27
 
VOTE REQUIRED
 
     The affirmative vote of the holders of two-thirds of the outstanding HI
Common Stock is required to approve the Merger Agreement. Approval of the Merger
Agreement constitutes approval of the Transaction and the other transactions
contemplated by the Merger Agreement.
 
     The affirmative vote of the holders of a majority of the outstanding NorAm
Common Stock is required to approve the Merger Agreement. Approval of the Merger
Agreement constitutes approval of the Transaction and the other transactions
contemplated by the Merger Agreement.
 
     No approval by the holders of outstanding shares of preferred stock of HL&P
is required to approve the Merger Agreement, and such holders are not entitled
to vote on the Merger Agreement.
 
RECORD DATE; STOCK ENTITLED TO VOTE
 
   
     The HI Board of Directors has established October 18, 1996 as the date to
determine those record holders of HI Common Stock entitled to notice of and to
vote at the HI Special Meeting. On October   , 1996, there were        shares of
HI Common Stock outstanding. Holders of HI Common Stock are entitled to one vote
with respect to the Merger Agreement for each share held.
    
 
   
     The NorAm Board of Directors has established October 18, 1996 as the date
to determine those record holders of NorAm Common Stock entitled to notice of
and to vote at the NorAm Special Meeting. On October   , 1996, there were
       shares of NorAm Common Stock outstanding. Holders of NorAm Common Stock
are entitled to one vote with respect to the Merger Agreement for each share
held.
    
 
VOTING OF PROXIES
 
     Shares represented by all properly executed proxies received in time for
each respective Special Meeting will be voted at such meeting in the manner
specified by the holders thereof. Proxies that do not contain voting
instructions will be voted FOR adoption and approval of the Merger Agreement at
the respective Special Meeting. It is not expected that any matter other than
those referred to herein will be brought before either of the Special Meetings.
If, however, other matters are properly presented, the persons named as proxies
will vote in accordance with their judgment with respect to such matters.
 
     If a holder of HI Common Stock or NorAm Common Stock does not return a
signed proxy card, his or her shares will not be voted and thus will have the
effect of a vote against the Merger Agreement at the respective Special Meeting.
Abstentions and broker non-votes (shares held by brokers and other nominees or
fiduciaries that are present at either Special Meeting but not voted on a
particular matter) will have the effect of a vote against the Merger Agreement
at the respective Special Meeting.
 
     STOCKHOLDERS SHOULD NOT SEND STOCK CERTIFICATES WITH THEIR PROXY CARDS.
 
     All elections by NorAm stockholders as to the form of the Merger
Consideration are to be made on the Election Form to be mailed to NorAm
stockholders of record at least 20 business days prior to the Closing Date. See
"The Transaction -- Election Procedure."
 
REVOCATION OF PROXIES
 
     Any holder of HI Common Stock has the unconditional right to revoke his or
her proxy at any time prior to the voting thereof at the HI Special Meeting by
(i) filing a written revocation with the Corporate Secretary of HI prior to the
voting of such proxy, (ii) giving a duly executed proxy bearing a later date or
(iii) attending the HI Special Meeting and voting in person. Attendance by a
stockholder at the HI Special Meeting will not by itself revoke his or her
proxy.
 
     Any holder of NorAm Common Stock has the unconditional right to revoke his
or her proxy at any time prior to the voting thereof at the NorAm Special
Meeting by (i) filing a written revocation with the Secretary of NorAm prior to
the voting of such proxy, (ii) giving a duly executed proxy bearing a later date
or
 
                                       20
<PAGE>   28
 
(iii) attending the NorAm Special Meeting and voting in person. Attendance by a
stockholder at the NorAm Special Meeting will not by itself revoke his or her
proxy.
 
SOLICITATION OF PROXIES
 
   
     Solicitation of proxies for use at the HI Special Meeting and the NorAm
Special Meeting may be made in person or by mail, telephone, telecopy or
telegram. Each of HI and NorAm will bear the cost of the solicitation of proxies
from its own stockholders, except that HI and NorAm will share equally the
Registration Statement filing fees and the cost of printing this Joint Proxy
Statement/Prospectus. In addition to solicitation by mail, the directors,
officers and regular employees of each company and its subsidiaries may solicit
proxies from stockholders of such company by telephone, telecopy or telegram or
in person. HI and NorAm have requested banking institutions, brokerage firms,
custodians, trustees, nominees and fiduciaries to forward solicitation materials
to the beneficial owners of HI Common Stock and NorAm Common Stock held of
record by such entities, and HI and NorAm will, upon the request of such record
holders, reimburse reasonable forwarding expenses. In addition, HI and NorAm
have engaged Morrow & Co. to assist in the solicitation of proxies. HI and NorAm
anticipate that they will incur total fees of approximately $13,500 and $8,500,
respectively, plus reimbursement of certain out-of-pocket expenses for this
service, with each company to pay for its own solicitation costs.
    
 
SECURITY OWNERSHIP OF CERTAIN PERSONS
 
   
     As of October   , 1996, the directors and executive officers of HI as a
group and NorAm as a group beneficially owned (excluding shares purchasable upon
exercise of stock options) less than 1% of the outstanding shares of HI Common
Stock and NorAm Common Stock, respectively, and all of such directors and
executive officers who had the right to vote, as of the respective Record Date,
have indicated that they intend to vote in favor of the proposal to approve and
adopt the Merger Agreement.
    
 
                                       21
<PAGE>   29
 
                                THE TRANSACTION
 
GENERAL
 
     HI, HL&P, Merger Sub and NorAm have entered into the Merger Agreement,
which provides that, subject to the satisfaction of the conditions thereof (see
"Certain Provisions of the Merger Agreement -- Conditions to the Transaction"),
the HI/HL&P Merger and the NorAm Merger will be effected, or under certain
circumstances, as more fully described below under "-- The Alternative Mergers,"
one of the Alternative Mergers will be effected in lieu of the Basic Mergers
(the "Selected Alternative Merger"). THE DESCRIPTION OF THE MERGER AGREEMENT
CONTAINED IN THIS JOINT PROXY STATEMENT/PROSPECTUS IS QUALIFIED IN ITS ENTIRETY
BY REFERENCE TO THE MERGER AGREEMENT, A COPY OF WHICH IS INCLUDED AS APPENDIX A
TO THIS JOINT PROXY STATEMENT/PROSPECTUS AND IS INCORPORATED IN ITS ENTIRETY
HEREIN BY REFERENCE.
 
THE HI/HL&P MERGER
 
     The Merger Agreement provides for the merger of HI into HL&P. HL&P will be
the surviving corporation and will be renamed "Houston Industries Incorporated."
In the Transaction, each share of HI Common Stock (including each associated HI
Right) outstanding immediately prior to the Effective Time (other than shares
owned immediately prior to such time directly or indirectly by HI or HL&P, which
will be canceled) will be automatically converted into one share of Houston
Common Stock (and one associated Houston Right). Stockholders of HI will not
need to exchange stock certificates formerly representing shares of HI Common
Stock for stock certificates representing shares of Houston Common Stock. Each
unexpired employee or director stock option to purchase HI Common Stock issued
by HI that is outstanding at the Effective Time will automatically be converted
into an option to purchase the number of shares of Houston Common Stock equal to
the number of shares of HI Common Stock that could be purchased under such
option at a price per share of Houston Common Stock equal to the per share
exercise price of such option. Each outstanding share of cumulative preferred
stock of HL&P will not be converted or otherwise affected by the Transaction and
will remain outstanding after the Transaction.
 
   
     HOLDERS OF HI COMMON STOCK SHOULD NOT SUBMIT CERTIFICATES REPRESENTING
THEIR SHARES OF HI COMMON STOCK FOR EXCHANGE.
    
 
     The Closing will occur on the fifth business day after all of the
conditions to the Transaction contained in the Merger Agreement have been
satisfied or waived unless another date is agreed to by HI and NorAm. As soon as
practicable after the Closing, Articles of Merger with respect to the HI/HL&P
Merger will be filed with the Secretary of State of the State of Texas, and the
HI/HL&P Merger will become effective upon the issuance of the HI/HL&P Merger
Certificate of Merger by the Secretary of State of the State of Texas, or at
such time thereafter as is provided in the Articles of Merger with respect
thereto. The effective time of the HI/HL&P Merger will be immediately prior to
the effective time of the NorAm Merger.
 
     Pursuant to the Merger Agreement, the Restated Articles of Incorporation of
HL&P, as amended by the amendments thereto set forth as Exhibit A to the Merger
Agreement (the "Amendments") (see "-- Amendment of Articles of Incorporation"),
will be the Articles of Incorporation of Houston and the Bylaws of HI will be
the Bylaws of Houston. The directors and officers of HI at the effective time of
the HI/HL&P Merger will be the initial directors and officers of Houston. In
addition, T. Milton Honea, Robert C. Hanna, O. Holcombe Crosswell and Joseph M.
Grant, each of whom is currently a director of NorAm, will be elected as
directors of Houston effective as of the Effective Time. See "Relationships of
the Parties -- Following the Transaction -- Board of Directors of Houston."
 
     However, if the Transaction is accomplished using the Second Alternative
Merger (as hereinafter defined), HI will not be merged into HL&P. In that event,
HL&P will remain a subsidiary of HI and the shares of HI capital stock will not
be affected.
 
THE NORAM MERGER
 
     The Merger Agreement provides for the merger of NorAm into Merger Sub (or
into Houston, if the First Alternative Merger (as hereinafter defined) is
implemented). Merger Sub will be the surviving corporation
 
                                       22
<PAGE>   30
 
and will be renamed "NorAm Energy Corp." In the Transaction, each share of NorAm
Common Stock outstanding immediately prior to the Effective Time (other than
dissenting shares and shares owned immediately prior to such time directly or
indirectly by NorAm or HI, which will be canceled) will be automatically
converted into the right to receive the Merger Consideration, as described
below. See "-- Merger Consideration."
 
   
     The Closing will occur on the fifth business day after all of the
conditions to the Transaction contained in the Merger Agreement have been
satisfied or waived unless another date is agreed to by HI and NorAm. As soon as
practicable after the Closing, the Certificate of Merger relating to the NorAm
Merger will be filed with the Secretary of State of the State of Delaware, and
the time of such filing will be the Effective Time unless otherwise provided in
the Certificate of Merger. The effective time of the HI/HL&P Merger will be
immediately prior to the effective time of the NorAm Merger.
    
 
     Pursuant to the Merger Agreement, the Certificate of Incorporation of
Merger Sub, as amended to change its name to "NorAm Energy Corp.," will be the
Certificate of Incorporation of, and the Bylaws of Merger Sub will be the Bylaws
of, the surviving corporation of the NorAm Merger. The directors of Merger Sub
at the Effective Time and the officers of NorAm at the Effective Time will be
the initial directors and officers of the surviving corporation of the NorAm
Merger.
 
   
MERGER CONSIDERATION
    
 
     NORAM COMMON STOCK.  Except for shares as to which appraisal rights have
been perfected under Delaware law (the "Dissenting Shares") and shares owned
directly or indirectly by NorAm or HI (which will be canceled at the Effective
Time), each share of NorAm Common Stock outstanding immediately prior to the
Effective Time will be converted at the Effective Time into the right to receive
from Houston the Merger Consideration. The Merger Consideration will consist of
(i) Cash Consideration of $16.00 or (ii) Stock Consideration (including a
corresponding number of Houston Rights), as the holders of NorAm Common Stock
thereof shall have elected or be deemed to have elected as described in
"-- Election Procedure" below.
 
     The Merger Agreement contains certain provisions generally designed to
result in 50% of the outstanding shares of NorAm Common Stock being converted
into the Stock Consideration and 50% of the outstanding shares of NorAm Common
Stock being converted into the Cash Consideration. See "-- Proration."
Notwithstanding the foregoing, HI has the option, in its sole discretion, to
change the Cash Election Number and the Stock Election Number to more closely
follow the actual elections of NorAm stockholders so long as such modification
does not prevent tax counsel to NorAm or tax counsel to HI from delivering their
respective tax opinions which are conditions to consummating the Transaction.
See "-- Certain Federal Income Tax Consequences."
 
     If the Closing does not occur by May 11, 1997, the Cash Consideration (but
not the Stock Consideration) will increase thereafter by two percent (simple
interest based on a year of 365 days) per quarter until the consummation of the
Transaction. The increase, if any, will be payable pro rata on a daily basis for
the period from May 11, 1997 until consummation. Otherwise, no interest will be
payable on the Merger Consideration. As used in this Joint Proxy
Statement/Prospectus, the term "Cash Consideration" includes any such increase.
 
     The "Stock Consideration" will be determined as follows:
 
          - if the Average Price of HI Common Stock (as defined below) is $21.25
     or lower, the Stock Consideration will be 0.7529 shares of Houston Common
     Stock;
 
          - if the Average Price of HI Common Stock is $26.00 or greater, the
     Stock Consideration will be 0.6154 shares of Houston Common Stock; or
 
          - if the Average Price of HI Common Stock is greater than $21.25 but
     less than $26.00, the Stock Consideration will be that portion of a share
     of Houston Common Stock equal to the quotient of $16.00 divided by the
     Average Price of HI Common Stock.
 
                                       23
<PAGE>   31
 
     In each case, the Stock Consideration includes a corresponding number of
associated Houston Rights. The "Average Price" of HI Common Stock will be the
average of the closing sales prices per share of HI Common Stock, rounded to
four decimal places, as reported in The Wall Street Journal's New York Stock
Exchange Composite Transactions Reports, for each of the first 20 consecutive
trading days in the period commencing 25 trading days prior to the Closing Date.
 
   
     NORAM CONVERTIBLE SECURITIES.  The NorAm 6% Convertible Subordinated
Debentures due 2012 (the "6% Convertible Debentures") and the NorAm 6 1/4%
Convertible Junior Subordinated Debentures (the "6 1/4% Convertible Debentures")
which are outstanding at the Effective Time shall continue to be outstanding
subsequent to the Effective Time as debt instruments of the surviving
corporation of the NorAm Merger, subject to their respective terms and
conditions and the execution and delivery of a supplemental indenture in the
form required thereby. NorAm Financing I, a Delaware statutory business trust
(the "Trust"), holds all of the 6 1/4% Convertible Debentures. The Trust
publicly issued 3,450,000 shares of 6 1/4% Convertible Trust Originated
Preferred Securities (the "Convertible Preferred Securities" and together with
the 6% Convertible Debentures, the "Convertible Securities"). The ability of the
Trust to pay distributions on the Convertible Preferred Securities is solely
dependent on the Trust's receipt of interest payments from NorAm on the 6 1/4%
Convertible Debentures. The Convertible Preferred Securities which are
outstanding at the Effective Time shall continue to be outstanding subsequent to
the Effective Time as securities of the Trust. Following the Effective Time,
each outstanding 6% Convertible Debenture and each outstanding Convertible
Preferred Security will be convertible into the amount of Stock Consideration
and Cash Consideration which the holder thereof would have had the right to
receive after the Effective Time if such Convertible Security had been converted
immediately prior to the Effective Time and the holder thereof had received
Stock Consideration with respect to 50% of such holder's shares received upon
conversion and Cash Consideration with respect to the remaining 50% of such
holder's shares received upon conversion. At June 30, 1996, $130.0 million in
principal amount of 6% Convertible Debentures were issued and outstanding (which
are convertible at $28.625 per share into approximately 4,541,485 shares of
NorAm Common Stock), and $172.5 million in principal amount of Convertible
Preferred Securities were issued and outstanding (which are convertible at
$12.125 per share into approximately 14,226,765 shares of NorAm Common Stock).
    
 
     NORAM 10% DEBENTURES DUE 2019.  In the event that within a specified period
following public announcement of the consummation of the Transaction, the rating
of the NorAm 10% Debentures due 2019 (the "NorAm 10% Debentures") (i) falls
below Investment Grade (as defined in the indenture governing the NorAm 10%
Debentures), assuming the NorAm 10% Debentures are rated by one of certain
rating agencies as Investment Grade on the date which is 121 days prior to
public announcement of the consummation of the Transaction (the "Rating Date")
or (ii) falls at least one Full Rating Category (as defined in such indenture)
below the rating of the NorAm 10% Debentures on the Rating Date, then each
holder of NorAm 10% Debentures will have the right, at the holder's option, to
require NorAm's successor to purchase all or any part of such holder's NorAm 10%
Debentures by a specified date at 100% of the principal amount thereof, plus
accrued interest to the repurchase date.
 
   
     NORAM EMPLOYEE STOCK OPTIONS.  Each holder of an unexpired employee stock
option to purchase NorAm Common Stock, along with any tandem stock appreciation
right, that is outstanding at the Effective Time (a "NorAm Stock Option"),
whether or not then exercisable, will be entitled to elect either to have all or
any portion of his or her NorAm Stock Options canceled and "cashed out" as
described below or to have all or any portion of his or her NorAm Stock Options
assumed by Houston. Holders of NorAm Stock Options will make such elections on
forms to be provided by NorAm to such holders. To be effective, an election form
must be properly completed, signed and submitted to HL&P or its designated agent
by 5:00 p.m. on the business day immediately prior to the Closing Date. A holder
of NorAm Stock Options who does not make a proper election will be deemed to
have elected to have his or her NorAm Stock Options "cashed out." If a holder of
NorAm Stock Options elects to be "cashed out" or does not properly make an
election, the NorAm Stock Options of such holder will be canceled by NorAm
immediately prior to the Effective Time, and each holder of a canceled NorAm
Stock Option will be entitled to receive, as soon as practicable after the
Effective Time, in consideration for the cancellation of such NorAm Stock
Option, an amount in cash equal to the product of (i) the total number of shares
of NorAm Common Stock subject to such holder's NorAm Stock
    
 
                                       24
<PAGE>   32
 
Option and (ii) the excess, if any, of (x) the Cash Consideration over (y) the
exercise price per share of the NorAm Common Stock previously subject to such
NorAm Stock Option. Generally, each NorAm Stock Option of a holder who has
properly elected to have Houston assume his or her NorAm Stock Options will be
deemed to be an option to acquire, on the same terms and conditions as were
applicable under such NorAm Stock Option, a number of shares of Houston Common
Stock equal to the number of shares of NorAm Common Stock purchasable pursuant
to such NorAm Stock Option multiplied by the Stock Consideration, at a price per
share equal to the per-share exercise price for the shares of NorAm Common Stock
purchasable pursuant to such NorAm Stock Option divided by the Stock
Consideration.
 
ELECTION PROCEDURE
 
   
     Subject to the proration procedures described below, each record holder of
shares of NorAm Common Stock (other than Dissenting Shares and shares owned
immediately prior to the Effective Time directly or indirectly by NorAm or HI,
which shares will be canceled) outstanding immediately prior to the Effective
Time shall be entitled to elect to receive in respect of each such share either
Cash Consideration or Stock Consideration. Alternatively, a record holder may
indicate that the record holder has no preference as between Cash Consideration
and Stock Consideration for such shares. Shares of NorAm Common Stock in respect
of which no election is made or deemed to have been made, or shares of NorAm
Common Stock as to which the holder thereof has tried to avail himself or
herself of the appraisal right provisions of Delaware law but has failed to
properly comply with such provisions (collectively, the "Non-Election Shares"),
will be deemed by HL&P, in its sole and absolute discretion, to be shares in
respect of which either Cash Elections or Stock Elections have been made. SHARES
OF NORAM COMMON STOCK IN RESPECT OF WHICH A VALID ELECTION IS NOT MADE WILL BE
DEEMED TO BE NON-ELECTION SHARES.
    
 
   
     All elections are to be made on the Election Form to be mailed to NorAm
stockholders of record at least 20 business days prior to the Closing Date.
Stockholders may also obtain copies of the Election Form upon request from the
Exchange Agent either in writing by mail to        , or by telephone at
       . HI will issue a public announcement of the anticipated Closing Date as
soon as practicable, but in no event less than five trading days prior to the
Closing Date.
    
 
   
     Election Forms must be received by the Exchange Agent at its designated
office no later than 5:00 p.m., New York City time, on the trading day
immediately preceding the Closing Date (the "Election Deadline"). For an
Election Form to be effective, holders of NorAm Common Stock must properly
complete, sign and submit such Election Form, and such form must be received by
the Exchange Agent at        , if by mail, to                      or, if by
courier, to                      , and not withdrawn, by the Election Deadline.
HI will issue a public announcement of the Average Price of HI Common Stock and
the number of shares of Houston Common Stock to be issued as Stock Consideration
as soon as practicable after such amounts are determinable.
    
 
   
     COMPLETING THE ELECTION FORM. To make a proper election, a holder of shares
of NorAm Common Stock must have delivered to the Exchange Agent at the address
specified above prior to the Election Deadline the following:
    
 
   
          (i) an Election Form properly completed in accordance with the
     instructions thereon and signed by the record holder of the shares of NorAm
     Common Stock as to which such election is being made; and
    
 
   
          (ii) either (a) the certificates for such shares or (b) an appropriate
     guarantee of delivery of certificates for such shares.
    
 
   
     Holders of record of NorAm Common Stock who hold such shares as nominees,
trustees or in other such representative capacities may submit multiple Election
Forms.
    
 
   
     A form of the guarantee of delivery accompanies the Election Form, and,
unless stock certificates are submitted with the Election Form, a guarantee of
delivery must be properly executed by a firm which is a member of any registered
national securities exchange or a member of the National Association of
Securities Dealers, Inc. or a bank, broker, dealer, credit union, savings
association or other entity that is a member in
    
 
                                       25
<PAGE>   33
 
   
good standing of the Securities Transfer Agent's Medallion Program, the New York
Stock Exchange Medallion Signature Guarantee Program or the Stock Exchange
Medallion Program, and certificates for the shares covered by such guarantee
must in fact be received by the Exchange Agent by the time specified in such
guarantee for a valid Election Form to have been deemed submitted.
    
 
   
     WITHDRAWAL AND CHANGE OF ELECTIONS. Any NorAm stockholder may revoke his or
her election by submitting to the Exchange Agent written notice and a properly
completed and signed revised Election Form, by withdrawing his or her
certificates for shares of NorAm Common Stock, or by withdrawing the guarantee
of delivery of such certificates previously deposited with the Exchange Agent,
provided that the Exchange Agent receives all necessary materials prior to the
Election Deadline. Upon any such revocation, unless a duly completed Election
Form is thereafter submitted, such shares will be Non-Election Shares.
    
 
   
     All elections will be revoked automatically if the Exchange Agent is
notified in writing by HI or NorAm that the Merger Agreement has been
terminated.
    
 
   
     DISCRETIONARY AUTHORITY. HL&P will determine in its sole and absolute
discretion whether Election Forms have been properly completed, signed and
submitted or revoked. The determinations of HL&P in such matters will be
conclusive and binding.
    
 
   
     TIMING OF ELECTION PROCEDURES. The following diagram sets forth the
anticipated procedures (and certain related events) that a NorAm stockholder
will need to follow in connection with his or her election to receive Cash
Consideration or Stock Consideration.
    

   
                        --Description of Omitted Chart--

     The omitted graphic material consists of a time line showing certain
events leading up to the Closing Date.  According to the time line, HI will
mail Election Forms to record holders of NorAm Common Stock at least 20 days
prior to the Closing Date.  Such holders will be able to complete, sign and
submit (or change) their Election Forms until the Election Deadline, which is
represented on the time line as being one (1) trading day prior to the Closing
Date.  As depicted on the time line,  a public announcement of the Closing Date
and of the Average Price of the HI Common Stock will be made at least (5)
trading days before the Closing Date.
    
 
     IN MAKING AN ELECTION FOR CASH CONSIDERATION OR STOCK CONSIDERATION, NORAM
STOCKHOLDERS ARE URGED TO CONSIDER THE POSSIBLE IMPACT OF THE FLUCTUATING MARKET
VALUE OF HI COMMON STOCK ON THE VALUE OF TOTAL CONSIDERATION RECEIVED IN THE
TRANSACTION. UNDER THE MERGER AGREEMENT, THE STOCK CONSIDERATION PER SHARE OF
NORAM COMMON STOCK WILL BE FIXED AT NOT LESS THAN 0.6154 SHARES AND NOT MORE
THAN 0.7529 SHARES OF HOUSTON COMMON STOCK. THIS WILL RESULT IN STOCK
CONSIDERATION HAVING A VALUE OF $16.00 PER SHARE OF NORAM COMMON STOCK BASED
UPON THE AVERAGE PRICE OF HI COMMON STOCK, IF THE AVERAGE PRICE OF HI COMMON
STOCK IS GREATER THAN OR EQUAL TO $21.25 AND LESS THAN OR EQUAL TO $26.00. IF
THE AVERAGE PRICE OF HI COMMON STOCK IS LESS THAN $21.25 PER SHARE, THE VALUE OF
THE STOCK CONSIDERATION BASED UPON THE AVERAGE PRICE WILL BE LESS THAN $16.00.
CONVERSELY, IF THE AVERAGE PRICE OF HI COMMON STOCK IS MORE THAN $26.00 PER
SHARE, THE VALUE OF THE STOCK CONSIDERATION BASED UPON THE AVERAGE PRICE WILL BE
MORE THAN $16.00. IN ANY EVENT, THERE IS NO ASSURANCE THAT THE AVERAGE PRICE
(WHICH IS BASED UPON A 20-TRADING-DAY AVERAGE CLOSING SALES PRICE DETERMINED
PRIOR TO THE CLOSING DATE) OF HI COMMON STOCK WILL APPROXIMATE THE ACTUAL VALUE
OF HOUSTON COMMON STOCK AT THE CLOSING DATE OR AT ANY TIME THEREAFTER.
 
     NORAM STOCKHOLDERS WHO PERFECT AN ELECTION MAY NOT RECEIVE THE ELECTED
STOCK CONSIDERATION OR CASH CONSIDERATION IN FULL DUE TO PRORATION LIMITATIONS
IN THE MERGER AGREEMENT, WHICH GENERALLY ARE DESIGNED TO EXCHANGE ONE-HALF OF
THE OUTSTANDING SHARES OF NORAM COMMON STOCK FOR STOCK CONSIDERATION AND ONE-
 
                                       26
<PAGE>   34
 
HALF OF SUCH SHARES (INCLUDING DISSENTING SHARES) FOR CASH CONSIDERATION. NORAM
STOCKHOLDERS ARE ALSO URGED TO CONSIDER THE DIFFERING FEDERAL INCOME TAX
CONSEQUENCES IN MAKING THE ELECTION, AS DISCUSSED BELOW.
 
   
     THE SHARES OF NORAM COMMON STOCK OF A HOLDER WHO FAILS TO PROPERLY COMPLETE
AND RETURN THE ELECTION FORM, TOGETHER WITH CERTIFICATES REPRESENTING SUCH
HOLDER'S SHARES OF NORAM COMMON STOCK OR AN APPROPRIATE GUARANTEE OF DELIVERY OF
CERTIFICATES FOR SUCH SHARES, TO THE EXCHANGE AGENT BY THE ELECTION DEADLINE, OR
WHO FAILS TO COMPLY WITH THE ELECTION PROCEDURES DESCRIBED IN THIS JOINT PROXY
STATEMENT/ PROSPECTUS AND THE ELECTION FORM, WILL BE DEEMED BY HL&P, IN ITS SOLE
AND ABSOLUTE DISCRETION, TO BE SHARES IN RESPECT OF WHICH EITHER CASH ELECTIONS
OR STOCK ELECTIONS HAVE BEEN MADE.
    
 
PRORATION
 
   
     If the aggregate number of shares in respect of which Cash Elections have
been made (the "Cash Election Shares") exceeds the Cash Election Number (as
defined below), (1) not all Cash Election Shares will be converted into the Cash
Consideration, and the Cash Election Shares to be converted into the Cash
Consideration will be prorated and (2) all shares of NorAm Common Stock in
respect of which Stock Elections have been made (the "Stock Election Shares")
and all Non-Election Shares in respect of which Stock Elections are deemed to
have been made will be converted into the right to receive Stock Consideration.
The proration of Cash Election Shares to be converted into the right to receive
Stock Consideration or Cash Consideration will be performed as follows: (i) Cash
Election Shares will be deemed to be Stock Election Shares on a pro rata basis
for each record holder of NorAm Common Stock with respect to those shares of
NorAm Common Stock, if any, of such record holder which are Cash Election
Shares, so that the number of Cash Election Shares so deemed to be Stock
Election Shares, when added to the other Stock Election Shares and all
Non-Election Shares in respect of which Stock Elections are deemed to have been
made, will equal as closely as practicable the Stock Election Number, and all
such Cash Election Shares so deemed to be Stock Election Shares will be
converted into the right to receive Stock Consideration; and (ii) the remaining
Cash Election Shares will be converted into the right to receive Cash
Consideration. The "Cash Election Number" is the aggregate number of shares of
NorAm Common Stock to be converted into the right to receive Cash Consideration,
which will be equal to (i) 50% of the number of shares of NorAm Common Stock
outstanding immediately prior to the Effective Time less (ii) the sum of (A) the
number of Dissenting Shares determined as of the Effective Time, (B) the number
of shares of NorAm Common Stock owned immediately prior to the Effective Time
directly or indirectly by NorAm or HI (which will be canceled) and (C) the
number of shares of NorAm Common Stock to be exchanged for cash in lieu of
fractional shares.
    
 
   
     If the aggregate number of Stock Election Shares exceeds the Stock Election
Number (as defined below), all Cash Election Shares and all Non-Election Shares
in respect of which Cash Elections are deemed to have been made will be
converted into the right to receive Cash Consideration, and all Stock Election
Shares will be converted into the right to receive Stock Consideration or Cash
Consideration as follows: (i) Stock Election Shares will be deemed to be Cash
Election Shares on a pro rata basis for each record holder of NorAm Common Stock
with respect to those shares of NorAm Common Stock, if any, of such record
holder which are Stock Election Shares, so that the number of Stock Election
Shares so deemed to be Cash Election Shares, when added to the other Cash
Election Shares and all Non-Election Shares in respect of which Cash Elections
are deemed to have been made, will equal as closely as practicable the Cash
Election Number, and all such shares of NorAm Common Stock so deemed to be Cash
Election Shares will be converted into the right to receive the Cash
Consideration; and (ii) the remaining Stock Election Shares will be converted
into the right to receive the Stock Consideration. The "Stock Election Number"
is the aggregate number of shares of NorAm Common Stock to be converted into the
right to receive Stock Consideration, which will be equal to (i) the number of
shares of NorAm Common Stock outstanding immediately prior to the Effective Time
less (ii) the sum of the Cash Election Number and the sum of (A) the number of
Dissenting Shares determined as of the Effective Time, (B) the number of shares
of NorAm Common Stock owned immediately prior to the Effective Time directly or
indirectly by NorAm or HI (which will be canceled) and (C) the number of shares
of NorAm Common Stock to be exchanged for cash in lieu of fractional shares.
    
 
                                       27
<PAGE>   35
 
   
     Notwithstanding the foregoing, HI has the option, in its sole discretion,
to change the Cash Election Number and the Stock Election Number to more closely
follow the actual elections of NorAm stockholders so long as the total amount of
Cash Consideration (including (a) the amount of cash paid to holders of
Dissenting Shares, (b) the amount of cash paid in lieu of fractional shares, (c)
$16.00 per share of NorAm Common Stock, if any, held directly or indirectly by
HI or NorAm and (d) the 2% simple interest per quarter payable if the
Transaction is not consummated by May 11, 1997) paid to holders of NorAm Common
Stock does not exceed 58.7% of the sum of the total Cash Consideration and the
value of the Stock Consideration (based upon the average of the high and low
sales prices of HI Common Stock on the Closing Date).
    
 
   
     EXAMPLES OF PRORATION. The following examples illustrate the application of
the proration provisions of the Merger Agreement described above. For purposes
of the examples, it is assumed that: (i) there will be 120,000,000 shares of
NorAm Common Stock outstanding immediately prior to the Effective Time and (ii)
the total number of Dissenting Shares, shares owned directly or indirectly by HI
or NorAm and shares exchanged for cash in lieu of fractional shares is 2,000,000
shares of NorAm Common Stock.
    
 
   
     In the first example, it is assumed that: (i) the holders of 70,000,000
shares of NorAm Common Stock elected to receive Cash Consideration, (ii) the
holders of 40,000,000 shares of NorAm Common Stock elected to receive Stock
Consideration and (iii) the holders of 8,000,000 shares of NorAm Common Stock
indicated no Merger Consideration preference or did not timely submit a duly
completed Election Form to the Exchange Agent prior to the Election Deadline. In
this example, the Cash Election Number would be 58,000,000 (120,000,000 X 50% -
2,000,000) and the Stock Election Number would be 60,000,000 (120,000,000 -
(58,000,000 + 2,000,000)). As a result of such elections or non-elections (a)
the 8,000,000 Non-Election Shares and the 40,000,000 Stock Election Shares would
receive Stock Consideration, (b) 58,000,000 out of the 70,000,000 Cash Election
Shares would receive Cash Consideration and (c) 12,000,000 (i.e., the number of
Cash Election Shares in excess of the Cash Election Number) out of the
70,000,000 Cash Election Shares would receive Stock Consideration.
    
 
   
     In the second example, it is assumed that: (i) the holders of 30,000,000
shares of NorAm Common Stock elected to receive Cash Consideration, (ii) the
holders of 80,000,000 shares of NorAm Common Stock elected to receive Stock
Consideration and (iii) the holders of 8,000,000 shares of NorAm Common Stock
indicated no Merger Consideration preference or did not timely submit a duly
completed Election Form to the Exchange Agent prior to the Election Deadline. In
this example as in the previous example, the Cash Election Number would be
58,000,000 and the Stock Election Number would be 60,000,000. As a result of
such elections or non-elections (a) the 8,000,000 Non-Election Shares and the
30,000,000 Cash Election Shares would receive Cash Consideration, (b) 60,000,000
out of the 80,000,000 Stock Election Shares would receive Stock Consideration
and (c) 20,000,000 (i.e., the number of Stock Election Shares in excess of the
Stock Election Number) out of the 80,000,000 Stock Election Shares would receive
Cash Consideration.
    
 
PROCEDURES FOR EXCHANGE OF CERTIFICATES; THE PAYMENT FUND
 
   
     Upon the surrender of each certificate (a "Certificate") that prior to the
Effective Time represented shares of NorAm Common Stock, the Exchange Agent will
pay the holder of such Certificate the Merger Consideration multiplied by the
number of shares of NorAm Common Stock formerly represented by such Certificate
in exchange therefor, and such Certificate will forthwith be canceled. If the
Transaction is not consummated by May 11, 1997, the Cash Consideration (but not
the Stock Consideration) will increase thereafter by two percent (simple
interest based upon a year of 365 days) per quarter until the consummation of
the Transaction. The increase, if any, will be payable pro rata on a daily basis
for the period from May 11, 1997 until consummation. Otherwise, no interest will
be paid or will accrue on the Merger Consideration.
    
 
   
     As of the Effective Time, HL&P will deposit or cause to be deposited, in
trust with the Exchange Agent, for the benefit of the holders of shares of NorAm
Common Stock, for exchange as provided herein, the aggregate Merger
Consideration.
    
 
   
     The Election Form will contain instructions with respect to the surrender
of certificates representing NorAm Common Stock to be exchanged for the Merger
Consideration, including in the case of the Stock Consideration, certificates
representing Houston Common Stock. In order to make a proper election, a holder
    
 
                                       28
<PAGE>   36
 
   
of shares of NorAm Common Stock must have delivered to the Exchange Agent prior
to the Election Deadline (i) a properly completed Election Form and (ii) either
(a) the certificates for such shares or (b) an appropriate guarantee of delivery
of certificates for such shares.
    
 
   
     NORAM STOCKHOLDERS SHOULD NOT RETURN STOCK CERTIFICATES WITH THE ENCLOSED
PROXY.
    
 
     No dividends or other distributions declared or made after the Effective
Time with respect to shares of Houston Common Stock will be paid to the holder
of any unsurrendered Certificate with respect to the shares of Houston Common
Stock such holder is entitled to receive and no cash payment in lieu of
fractional shares will be paid to any such holder until the surrender of such
Certificate in accordance with the Merger Agreement.
 
   
     After the Effective Time, there will be no transfers on the stock transfer
books of the surviving corporation of the NorAm Merger of any shares of NorAm
Common Stock. If, after the Effective Time, Certificates formerly representing
shares of NorAm Common Stock are presented to the surviving corporation of the
NorAm Merger or the Exchange Agent, they will be canceled and (subject to
applicable abandoned property, escheat and similar laws and, in the case of
Dissenting Shares, subject to applicable law) exchanged for the applicable
Merger Consideration.
    
 
   
     Promptly following the first anniversary of the Effective Time, the
Exchange Agent will deliver to Houston all cash, shares of Houston Common Stock,
Certificates and other documents in its possession relating to the Transaction,
and thereafter Houston will act as the Exchange Agent. Thereafter, each holder
of a Certificate may surrender such Certificate to Houston and (subject to
applicable abandoned property, escheat and similar laws and, in the case of
Dissenting Shares, subject to applicable law) receive in exchange therefor the
applicable Merger Consideration, without any interest or dividends or other
payments thereon.
    
 
     HI shall not be liable to any holder of shares of NorAm Common Stock for
any Merger Consideration in respect of such shares (or dividends or
distributions with respect thereto) delivered to a public official pursuant to
any applicable abandoned property, escheat or similar law.
 
FRACTIONAL SHARES
 
     No fractional shares of Houston Common Stock will be issued to any NorAm
stockholder upon consummation of the Transaction. For each fractional share that
would otherwise be issued, Houston will pay by check an amount equal to a pro
rata portion of the net proceeds of the sale by the Exchange Agent of shares of
Houston Common Stock representing the aggregate of all such fractional shares
and the aggregate dividends or other distributions that are payable with respect
to such shares of Houston Common Stock. Such sale is to be executed by the
Exchange Agent as soon as practicable after the Effective Time at then
prevailing prices on the NYSE.
 
THE ALTERNATIVE MERGERS
 
     The Merger Agreement provides that under certain circumstances (as more
fully described below) one of two alternative merger structures could be
utilized in lieu of the Basic Mergers. If an Alternative Merger is utilized in
lieu of the Basic Mergers, such Alternative Merger is sometimes referred to
herein as the "Selected Alternative Merger."
 
     THE FIRST ALTERNATIVE MERGER.  HI is filing an application with the SEC
requesting an order granting Houston an exemption from regulation as a
registered public utility holding company under the 1935 Act. If the order is
not granted and HL&P, after consultation with its legal counsel, determines that
upon consummation of the Basic Mergers, Houston would not be an exempt public
utility holding company under the 1935 Act, NorAm and HI will both be merged
with and into HL&P (the "First Alternative Merger") with HL&P being the
surviving corporation and being renamed "Houston Industries Incorporated."
HL&P's determination to consummate the First Alternative Merger in lieu of the
Basic Mergers may be made before or after the Special Meetings. The primary
difference to HI stockholders and NorAm stockholders caused by consummating the
First Alternative Merger in lieu of the Basic Mergers is that NorAm would not be
a wholly owned subsidiary of Houston and all of the regulated utility assets of
HL&P and NorAm would be held within
 
                                       29
<PAGE>   37
 
the same corporation. The parties to the Merger Agreement have agreed that, if
the First Alternative Merger is to be effected, they will execute an appropriate
amendment to the Merger Agreement to reflect all changes required to be made in
the Merger Agreement to effect the First Alternative Merger in lieu of the Basic
Mergers.
 
     THE SECOND ALTERNATIVE MERGER.  The parties to the Merger Agreement have
acknowledged that in the absence of applicable regulatory constraints under the
1935 Act, it would be preferable for the HI/HL&P Merger not to be effected and
for NorAm to merge with and into Merger Sub, with Merger Sub being the surviving
corporation and being renamed "NorAm Energy Corp." In that event, both NorAm and
HL&P would be wholly owned subsidiaries of HI. Accordingly, if, at the time at
which all of the conditions to consummating the Transaction have been satisfied
or waived, the 1935 Act does not constrain the structure of the Transaction,
then (i) HI will not merge with and into HL&P and (ii) NorAm will merge with and
into Merger Sub (the "Second Alternative Merger"). The primary differences to
NorAm stockholders caused by consummating the Second Alternative Merger in lieu
of the Basic Mergers are: (i) HI would remain a holding company and HL&P and
NorAm would be wholly owned subsidiaries of HI and (ii) such stockholders would
receive HI Common Stock rather than Houston Common Stock. The terms and
provisions of HI Common Stock are substantially similar to the Houston Common
Stock described under "Description of Houston Capital Stock -- Common Stock." A
description of HI Common Stock and associated HI Rights is incorporated by
reference herein. See item 6 of the list of documents incorporated by reference
into this Joint Proxy Statement/Prospectus in "Incorporation of Certain
Documents by Reference." The parties to the Merger Agreement have agreed that,
if the Second Alternative Merger is to be effected, they will execute an
appropriate amendment to the Merger Agreement to reflect all changes required to
be made in the Merger Agreement to effect the Second Alternative Merger in lieu
of the Basic Mergers.
 
                                       30
<PAGE>   38
   
CORPORATE STRUCTURE
    
 
   
     The diagrams set forth below illustrate the corporate structure of HI and
NorAm prior to and following consummation of the Transaction.
    
 
   
                 CORPORATE STRUCTURE PRIOR TO THE TRANSACTION
    

   
     The omitted graphic material consists of a diagram depicting the current
corporate structure of HI and NorAm.  The diagram on the left side of the page
depicts HI as the parent company of HL&P and as the parent company of a group
of companies consisting of HI Energy and other nonregulated subsidiaries.  The
diagram on the right side of the page depicts NorAm as the parent company of a
group of existing subsidiaries.   
    
 
   
                   CORPORATE STRUCTURE FOLLOWING TRANSACTION
    
 
   
1) IF THE BASIC MERGERS ARE UTILIZED:
    
 
   
     The omitted graphic material consists of a diagram depicting the corporate
structure of HI and NorAm following the Transaction if the Basic Mergers are
utilized.  The diagram depicts the former stockholders of HI and NorAm as the
stockholders of a new entity, Houston, which is the parent company of NorAm and
a group of subsidiaries consisting of HI Energy and other nonregulated
subsidiaries of HI existing prior to the Basic Mergers.  NorAm is depicted as
the parent of a group of subsidiaries existing prior to the Basic Mergers. 
Houston is the entity resulting from the HI/HL&P Merger.
    
 
   
2) IF THE FIRST ALTERNATIVE MERGER IS UTILIZED IN LIEU OF THE BASIC MERGERS:
    
 
   
     The omitted graphic material consists of a diagram depicting the corporate
structure of HI and NorAm following the Transaction if the First Alternative
Merger is utilized in lieu of the Basic Mergers.  The diagram depicts the
former stockholders of HI and NorAm as the stockholders of Houston, the
post-merger entity consisting of HI, HL&P and NorAm.  Houston is depicted as
the parent company of a new group of subsidiaries consisting of HI Energy and
other nonregulated subsidiaries of HI existing prior to the First Alternative
Merger and as the parent company of certain subsidiaries of NorAm existing
prior to the First Alternative Merger.
    
 
 
                                       31
<PAGE>   39
   
3) IF THE SECOND ALTERNATIVE MERGER IS UTILIZED IN LIEU OF THE BASIC MERGERS:
    
 
   
     The omitted graphic material consists of a diagram depicting the
corporate structure of HI and NorAm following the Transaction if the Second
Alternative Merger is utilized in lieu of the Basic Mergers.  The stockholders
of HI and the former stockholders of NorAm are shown as the stockholders of HI. 
HI is shown as the parent company of HL&P, NorAm and a group of subsidiaries
consisting of HI Energy and other nonregulated subsidiaries of HI.  NorAm is
depicted as the parent company of certain subsidiaries of NorAm existing prior
to the Second Alternative Merger.
    
 
   
BACKGROUND OF THE TRANSACTION
    
 
   
     In May 1996, a representative of CS First Boston, at the request of HI, met
with T. Milton Honea, the Chief Executive Officer of NorAm, and suggested that
HI would be interested in exploring the possibility of a business combination
with NorAm. Subsequently, the CS First Boston representative contacted Mr. Honea
to suggest that he meet with Don D. Jordan, the Chief Executive Officer of HI.
Following a phone call from Mr. Jordan, Mr. Jordan and Mr. Honea met on June 24,
and Mr. Jordan proposed that the two companies explore the possibility of a
business combination. Mr. Jordan said that HI would consider a possible purchase
price of $15 per share of NorAm Common Stock, payable in a combination of
Houston Common Stock and cash, subject to due diligence and further analysis.
The two CEOs determined that they shared similar visions of likely future
developments affecting the electric and gas utility industries. The discussions
continued at a meeting between Mr. Jordan and Mr. Honea on June 27 when the two
CEOs further discussed the possibility of a business combination, the potential
benefits to NorAm stockholders of a business combination and the expected timing
of obtaining required regulatory approvals.
    
 
     Prior to NorAm's regularly scheduled July 10 Board of Directors meeting,
Mr. Honea called the Board members individually to discuss with them HI's
expressions of interest and the fact that a detailed presentation related to HI
would be made at the July 10 meeting. Presentations were made at the July 10
meeting by management and Merrill Lynch. The NorAm Board directed management to
continue exploration of a transaction and discussions with HI.
 
   
     Mr. Jordan and Mr. Honea met again on July 12, with Mr. Honea accompanied
by a representative of Merrill Lynch. On July 15, the two companies signed
parallel confidentiality and standstill agreements. On July 16, Mr. Jordan and
several other senior officers of HI and HL&P met with Mr. Honea and several
other senior officers of NorAm. Representatives of CS First Boston and Merrill
Lynch were also present. At this meeting, certain officers of each company made
presentations regarding business activities and strategies of their respective
organizations. Mr. Jordan and Mr. Honea met again on July 17 and confirmed to
each other an increasing interest in the possibility of a combination.
    
 
     On July 19, the Board of Directors of HI, at a special meeting, discussed
the status of the matter. Presentations were made by management, CS First Boston
and counsel. The HI Board directed management
 

                                       32
<PAGE>   40
 
to continue exploration of a transaction and discussions with NorAm. The HI
Board had also discussed the feasibility and desirability of a business
combination with NorAm at earlier board meetings.
 
     Thereafter, and continuing into early August, the possibility of a
transaction and related matters were discussed and negotiated at various
meetings between Mr. Jordan and Mr. Honea, among other senior officers of the
two companies, between CS First Boston and Merrill Lynch and between counsel for
the two companies. During this time period, the two companies exchanged detailed
operational, financial and other business information.
 
     On August 2, HI representatives told NorAm representatives that HI had
substantially completed its review of relevant NorAm business information and
was prepared to confirm its offer to pay $15 per NorAm share (payable half in
cash and half in stock), provided the other terms of a merger agreement could be
agreed upon. HI also sent NorAm a draft of a merger agreement.
 
     After several meetings early in the week of August 5, which included
substantial negotiation regarding price and discussion of due diligence results,
Mr. Jordan and Mr. Honea agreed on August 7 that a price of $16 per share (half
in cash and half in stock) would be an appropriate price to present to their
respective boards of directors if the parties successfully concluded
negotiations regarding the other terms and provisions of the merger agreement.
Following meetings between counsel on August 7 and 8, a substantially complete
form of the proposed merger agreement was delivered to the directors of each
company.
 
     On the afternoon of Friday, August 9, the Board of Directors of HI met to
consider the proposed transaction. Presentations were made by management, CS
First Boston and counsel. The HI Board reviewed and discussed the terms of the
transaction and management's assessment of the transaction from financial,
strategic, operating and regulatory standpoints. Representatives of CS First
Boston presented certain financial and other analyses and delivered CS First
Boston's opinion, later confirmed in writing, that as of the date of the board
meeting, the consideration to be paid in the transaction was fair from a
financial point of view to HI. After discussion, the Board of Directors, by a
unanimous vote of those present, approved the Merger Agreement and voted to
recommend approval of the Merger Agreement to HI's stockholders. The only
director who was absent from the meeting subsequently informed Mr. Jordan of his
approval of the Merger Agreement. The Boards of Directors of HL&P and Merger Sub
also approved the Merger Agreement.
 
     On Sunday, August 11, the Board of Directors of NorAm met to consider the
proposed transaction. Presentations were made by management, Merrill Lynch and
counsel. The NorAm Board reviewed and discussed the terms of the transaction and
management's assessment of the transaction from financial, strategic, operating
and regulatory standpoints. Representatives of Merrill Lynch presented certain
financial and other analyses and delivered Merrill Lynch's opinion, later
confirmed in writing, that as of the date of the board meeting, the
consideration to be received in the transaction by the holders of NorAm Common
Stock, taken as a whole, was fair from a financial point of view to such
holders. After discussion, the NorAm Board unanimously approved the Merger
Agreement and voted to recommend approval of the Merger Agreement to NorAm's
stockholders.
 
     Later on August 11, the parties executed and delivered the Merger
Agreement. On the morning of Monday, August 12, the transaction was publicly
announced.
 
HI'S REASONS FOR THE TRANSACTION
 
     STRATEGIC OVERVIEW.  In the fall of 1995, senior management of HI conducted
a strategic review of its business and of ongoing developments in the electric
utility and related industries regarding competition, regulation and
consolidation. Management concluded that the pace of change affecting the
electric utility industry was likely to accelerate, albeit in a state-by-state
fashion. Management also concluded that the markets for electricity and natural
gas were converging and consolidating and that these trends and competition for
customers would alter the structure and business practices of companies serving
these markets in the future. They observed a trend toward performance-based
rate-making for regulated distribution and transmission operations that should
provide an opportunity for favorable returns for better, more efficient
operators.
 
                                       33
<PAGE>   41
   
     Based on that analysis, in February 1996, HI reorganized its internal
operations, establishing five new Strategic Business Units ("SBUs"). Three of
the SBUs are within HL&P: Energy Production (fossil-fueled electric generation),
Energy Delivery and Customer Services (transmission and distribution of
electricity and engineering, as well as marketing and other customer services)
and the South Texas Project (nuclear operations). The other two SBUs are new
nonregulated units created to focus on wholesale energy trading and retail
marketing nationwide. The reorganization was designed to position HI to compete
more effectively in the future.
    
 
     Management also concluded that to increase its ability to compete
effectively in the new environment, HI should consider development or
acquisition of additional assets, skills and infrastructure. With respect to
wholesale energy marketing, management identified wholesale gas marketing
capability, trading and risk management skills, and ownership of or access to
physical gas assets. With respect to retail energy marketing, management
concluded that mass marketing expertise and an expanded retail customer base
would be desirable.
 
     Both before and after the February reorganization, management discussed
with the HI Board of Directors management's analysis and conclusions regarding
the nature and pace of change affecting the electric utility industry and the
appropriate responses for HI.
 
     In the spring of 1996, HI began to analyze potential candidates for
acquisition, merger or other strategic alliance which could fill these needs
with respect to both wholesale and retail marketing. That process ultimately
identified NorAm as a company possessing attractive attributes in both
categories.
 
     BENEFITS OF THE TRANSACTION.  HI's Board of Directors believes that the
Transaction offers the following significant strategic and financial benefits to
HI and its stockholders, as well as to its employees and customers:
 
    - NorAm brings to the combined companies more than 2.1 million additional
      retail distribution customers (net of its approximately 600,000 customers
      who overlap with HL&P's approximately 1.5 million retail customers). The
      Transaction will increase the combined companies' domestic retail customer
      base to approximately 3.6 million customers in six states. HI expects to
      enjoy opportunities to provide additional energy-related services to these
      customers.
 
    - NorAm has a fast-growing gas and electric wholesale trading organization.
      By combining the expertise of the NorAm trading organization with HL&P's
      electric power expertise, the Board believes HI can build a leading
      wholesale energy trading and risk management business.
 
    - NorAm's international strategy, with its emphasis on gas transmission and
      distribution, complements HI's international strategy, which is focused on
      power plant development and acquisition of electric distribution systems.
      The same gas/electric convergence trends that are developing in the United
      States are becoming evident elsewhere, and the Transaction should create a
      competitive advantage to HI in pursuing international energy
      opportunities.
 
   
All of the benefits listed above were considered as a whole by the HI Board in
reaching its conclusions, and it is impracticable to assign relative weights to
the benefits considered.
    
 
     MERGER OF HI INTO HL&P. In light of 1935 Act considerations, the Merger
Agreement provides that HI will be merged into HL&P. The HI Board believes the
merger of HI into HL&P is desirable because it will permit Houston to acquire
NorAm without becoming a registered public utility holding company under the
1935 Act. (If the 1935 Act is repealed or modified prior to the Closing Date and
does not constrain the structure of the Transaction, the Second Alternative
Merger will be used and HI will not be merged into HL&P.)
 
     CONCLUSION.  The HI Board of Directors believes that Houston and NorAm as a
combined enterprise will be better positioned, due to expanded skills, larger
customer base and greater resources, to take advantage of the opportunities
expected to be presented by convergence and consolidation trends in the gas and
electric utility and energy service industries. These factors will also enhance
the companies' ability to serve the
 
                                       34
<PAGE>   42
 
communities in which they do business. Accordingly, the HI Board believes the
Transaction should help Houston meet its objective of becoming a leading
national and international energy services provider.
 
NORAM'S REASONS FOR THE TRANSACTION
 
     STRATEGIC OVERVIEW. During much of 1995, NorAm management engaged in a
comprehensive strategic planning process involving a large number of its key
executives. The strategic plan which resulted was presented to NorAm's Board of
Directors in a multi-day meeting in October 1995.
 
     The strategic plan concluded that the domestic natural gas business was
undergoing a process of deregulation, which would lead, over the next several
years, to complete "unbundling" at the residential level. That is, residential
consumers would be able to choose from a number of unregulated service providers
to sell them the natural gas which would be physically transported through
existing distribution systems. The plan further concluded that the domestic
electricity markets would follow the same course, although perhaps on a
different time frame, leading to the convergence of the two markets.
Additionally the plan concluded that there was great potential for growth in
natural gas distribution in a number of developing areas of the world,
particularly Latin America and Asia.
 
     NorAm identified as its greatest strength its directly served base of 2.7
million customers and made "customer class" the driving force of its strategy.
It further identified as strengths its rapidly growing wholesale gas and power
marketing and trading business, its interstate pipeline business, and its early
position in Latin America.
 
     NorAm also identified certain weaknesses or "gaps," including financial
strength, size, electricity expertise, and mass marketing skills and associated
information systems, which needed to be addressed to enable NorAm to succeed in
pursuing its strategy.
 
     Given NorAm's rapidly improving operating results and strong customer base,
the Board concluded that management should pursue the proposed strategy and
develop plans to fill the identified gaps.
 
     FACTORS CONSIDERED. Prior to taking action on the Merger Agreement, the
NorAm Board reviewed various materials relevant to the Transaction and received
presentations from NorAm's management, its legal counsel, Jones, Day, Reavis &
Pogue and Hubert Gentry, Jr., and its financial advisor, Merrill Lynch, and
reviewed carefully with them the terms and conditions of the transactions
contemplated by the Merger Agreement.
 
     The NorAm Board considered numerous factors in reaching the conclusions
described below. The factors considered by the Board included, but were not
limited to, the following:
 
        - The substantial premium over historical market prices to be received
          by NorAm's stockholders. Based on the market prices of the HI Common
          Stock and the NorAm Common Stock on August 9, 1996, the last trading
          day prior to the date the Merger Agreement was executed, NorAm
          stockholders would receive a premium of approximately 38% over the
          closing sale price of NorAm Common Stock of $11.625. The premium is
          approximately 45.5% over the closing sale price of NorAm Common Stock
          on August 2, 1996, one week earlier.
 
        - The opinion of Merrill Lynch that as of the date of the opinion, the
          Merger Consideration, taken as a whole, was fair, from a financial
          point of view, to NorAm's stockholders.
 
        - The federal income tax consequences of the Transaction, including the
          ability of NorAm's stockholders to elect Stock Consideration, and
          thereby, if all Stock Consideration is received, to have a tax-free
          exchange of their NorAm Common Stock.
 
        - HL&P's strength as the ninth largest electric utility, as well as its
          domestic and international power projects, providing a strategic
          opportunity to complement NorAm's growth plans.
 
        - The continuing equity interest in the larger combined electric and gas
          operations of HI and NorAm provided by the Stock Consideration offered
          to NorAm's stockholders which, depending
 
                                       35
<PAGE>   43
          on the price of HI Common Stock, would range from approximately 16% to
          19% of the outstanding shares of HI Common Stock (assuming 50% Stock
          Consideration).
 
        - The creation of a more competitive company for both the domestic and
          international energy markets because of the financial strength,
          prospects and cash flow available for investment of the combined
          HI/NorAm.
 
   
        - The combined HI/NorAm would have a lower debt to equity ratio than
          NorAm on a stand alone basis and the resulting stronger balance sheet
          would create a more competitive company with greater financial
          flexibility.
    
 
        - The expected immediate increase in dividends that will be received by
          a NorAm stockholder who receives all Stock Consideration. This
          dividend increase will range from $.64 to $.85 per equivalent NorAm
          share (depending on the Average Price of the HI Common Stock), as
          compared to the current annual NorAm dividend of $.28 per share.
 
        - The impact of the Transaction on NorAm's employees.
 
        - Other strategic alternatives for NorAm, including remaining an
          independent company or entering into other business combinations.
 
        - The recent substantial activity in utility restructuring,
          combinations and developing convergence strategies related to the
          development of energy services companies, as opposed to separate
          electric and gas companies, and the size and scale requirements
          necessary for future success.
 
        - The terms and conditions of the Merger Agreement, including the
          ability of the NorAm Board, in the exercise of its fiduciary duties,
          to cooperate and negotiate with a third party an alternative
          unsolicited transaction that is financially superior to the
          Transaction, and to recommend such alternative transaction to NorAm's
          stockholders, all subject to compliance with certain provisions of the
          Merger Agreement. NorAm's only obligations in such an event would be
          to allow HI an opportunity to improve the terms of the Merger
          Agreement, and if not sufficiently improved, to accept the alternative
          transaction and to pay HI a $75,000,000 termination fee.
 
   
All of the factors listed above were considered as a whole by the NorAm Board in
reaching its conclusions, and it is impracticable to assign relative weights to
the factors considered.
    
 
     The NorAm Board determined to pursue the Transaction rather than other
alternatives (after review thereof with the assistance of Merrill Lynch) because
of the Board's view that (i) the values to NorAm's stockholders which could be
achieved by NorAm's either remaining an independent company or choosing other
possible alternatives were considered unlikely to equal the value to NorAm's
stockholders to be achieved by the Transaction, (ii) the ability of NorAm's
stockholders who receive Stock Consideration to participate in the continued
growth of NorAm and HI through their ownership of stock of Houston, a company
with greater financial strength, financial flexibility and cash available for
investments than NorAm on a stand-alone basis and (iii) the fact that the Merger
Agreement does not preclude any other party from making a proposal for a
business combination with NorAm.
 
     The Board of Directors of NorAm believes that the terms of the Merger
Agreement are fair to, and in the best interests of, NorAm and its stockholders.
 
RECOMMENDATIONS OF THE BOARDS OF DIRECTORS
 
   
     For the reasons described above under "-- HI's Reasons for the Transaction"
and "-- NorAm's Reasons for the Transaction," the HI Board of Directors has
unanimously approved the Merger Agreement and the transactions contemplated
thereby and RECOMMENDS THAT HI STOCKHOLDERS VOTE FOR ADOPTION AND APPROVAL OF
THE MERGER AGREEMENT and the NorAm Board of Directors has unanimously approved
the Merger Agreement and the transactions contemplated thereby and RECOMMENDS
THAT NORAM STOCKHOLDERS VOTE FOR ADOPTION AND APPROVAL OF THE MERGER AGREEMENT.
    
 
                                       36
<PAGE>   44
 
OPINION OF HI'S FINANCIAL ADVISOR
 
     HI retained CS First Boston to act as its financial advisor in connection
with the Transaction. CS First Boston was selected by HI based on CS First
Boston's experience, expertise and familiarity with HI and its businesses. CS
First Boston is an internationally recognized investment banking firm and is
regularly engaged in the valuation of businesses and securities in connection
with mergers and acquisitions, leveraged buyouts, negotiated underwritings,
competitive biddings, secondary distributions of listed and unlisted securities,
private placements and valuations for estate, corporate and other purposes.
 
     In connection with CS First Boston's engagement, HI requested that CS First
Boston evaluate the fairness, from a financial point of view, to HI of the
Merger Consideration to be paid to the stockholders of NorAm in connection with
the Transaction. At a meeting of the Board of Directors of HI held on August 9,
1996, at which the HI Board approved the Transaction, CS First Boston rendered
to the HI Board an oral opinion to the effect that, as of such date and based
upon and subject to certain matters, the Merger Consideration proposed to be
paid by HI pursuant to the Transaction was fair to HI from a financial point of
view. CS First Boston confirmed this oral opinion by delivery of a written
opinion dated August 11, 1996.
 
     THE FULL TEXT OF CS FIRST BOSTON'S WRITTEN OPINION TO THE HI BOARD DATED
AUGUST 11, 1996, WHICH SETS FORTH THE ASSUMPTIONS MADE, MATTERS CONSIDERED AND
LIMITATIONS ON THE REVIEW UNDERTAKEN, IS ATTACHED AS APPENDIX B TO THIS JOINT
PROXY STATEMENT/PROSPECTUS AND IS INCORPORATED HEREIN BY REFERENCE. HOLDERS OF
HI COMMON STOCK ARE URGED TO READ THIS OPINION IN ITS ENTIRETY. THE SUMMARY OF
THE OPINION OF CS FIRST BOSTON SET FORTH IN THIS JOINT PROXY
STATEMENT/PROSPECTUS IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT
OF SUCH OPINION.
 
     CS First Boston's opinion is addressed to the HI Board and addresses only
the fairness to HI from a financial point of view of the Merger Consideration
proposed to be paid to the NorAm stockholders pursuant to the Transaction and
does not constitute a recommendation to any HI stockholder as to how such
stockholder should vote at the HI Special Meeting. The Merger Consideration was
determined through negotiations between HI and NorAm and was approved by the HI
Board and the NorAm Board. CS First Boston provided advice to HI during the
course of such negotiations. The CS First Boston opinion does not address the
fairness of the Merger Consideration from a financial point of view or otherwise
to NorAm or NorAm's stockholders and, consequently, does not constitute a
recommendation to any NorAm stockholder in respect of such stockholder's
decision whether to vote in favor of adoption of the Transaction or in any other
respect.
 
   
     In arriving at its opinion, CS First Boston reviewed the Merger Agreement,
which includes a description of the HI/HL&P Merger, the NorAm Merger and the
Alternative Mergers, and certain related documents, and certain publicly
available business and financial information relating to HI and NorAm. CS First
Boston also reviewed certain other information, including financial forecasts,
provided to it by HI and NorAm and met with the respective managements of HI and
NorAm to discuss the businesses and prospects of HI and NorAm. CS First Boston
evaluated the pro forma financial impact of the Transaction on HI and considered
and relied upon the views of the respective managements of HI and NorAm
concerning certain strategic implications and operational benefits which might
result from the Transaction, including certain of the benefits considered by the
HI Board of Directors. See "-- HI's Reasons for the Transaction -- Benefits of
the Transaction." CS First Boston also considered and relied upon the views of
management of, and regulatory counsel for, HI concerning the anticipated
regulatory treatment to be accorded to the Transaction. CS First Boston also
considered certain financial and stock market data of HI and NorAm and compared
such data with similar data for other publicly held companies in businesses
similar to those of HI and NorAm and considered, to the extent publicly
available, the financial terms of certain other business combinations and other
transactions which have recently been effected. CS First Boston also considered
such other information, financial studies, analyses and investigations and
financial, economic and market criteria that CS First Boston deemed relevant.
    
 
     In connection with its review, CS First Boston did not assume any
responsibility for independent verification of any of the foregoing information
and relied upon its being complete and accurate in all material respects. With
respect to the financial forecasts, CS First Boston assumed that such forecasts
were reasonably
 
                                       37
<PAGE>   45
 
prepared on bases reflecting the best currently available estimates and
judgments of the managements of HI and NorAm as to the future financial
performance of HI and NorAm and the potential synergies and cost savings
(including the amount, timing and achievability thereof) expected to result from
the Transaction. In addition, CS First Boston has not made an independent
evaluation or appraisal of the assets or liabilities (contingent or otherwise)
of HI or NorAm, nor was CS First Boston furnished with any such evaluations or
appraisals. CS First Boston's opinion is necessarily based upon financial,
economic, market and other conditions as they existed and could be evaluated on
the date of its opinion. CS First Boston did not express any opinion as to what
the value of HI Common Stock will be when issued to NorAm's stockholders
pursuant to the Transaction or the prices at which HI Common Stock will trade
subsequent to the Transaction. CS First Boston assumed that the Transaction will
be treated as a tax-free reorganization for federal income tax purposes and
that, in the course of obtaining the necessary regulatory and governmental
approvals for the Transaction, no restriction will be imposed that will have a
material adverse effect on the contemplated benefits of the Transaction.
 
     In preparing its opinion for the HI Board, CS First Boston performed a
variety of financial and comparative analyses and considered a variety of
factors, including those described below performed by CS First Boston in
connection with its presentation to the HI Board on August 9, 1996. The summary
of CS First Boston's analyses set forth below does not purport to be a complete
description of the analyses underlying CS First Boston's opinion. The
preparation of a fairness opinion is a complex analytic process involving
various determinations as to the most appropriate and relevant methods of
financial analysis and the application of those methods to the particular
circumstances and, therefore, such an opinion is not readily susceptible to
summary description. In arriving at its opinion, CS First Boston made
qualitative judgments as to the significance and relevance of each analysis and
factor that it considered. Accordingly, CS First Boston believes that its
analyses must be considered as a whole and that selecting portions of its
analyses and factors, without considering all analyses and factors, could create
a misleading or incomplete view of the processes underlying such analyses and
its opinion.
 
   
     In its analyses, CS First Boston made numerous assumptions with respect to
HI, NorAm, industry performance, regulatory, general business, economic, market
and financial conditions and other matters, many of which are beyond the control
of HI and NorAm. No company, transaction or business used in such analyses as a
comparison is identical to HI, NorAm or the Transaction, nor is an evaluation of
the results of such analyses entirely mathematical; rather, it involves complex
considerations and judgments concerning financial and operating characteristics
and other factors that could affect the acquisition, public trading or other
values of the companies, business segments or transactions being analyzed. The
estimates contained in such analyses and the valuations resulting from any
particular analysis are not necessarily indicative of actual values or
predictive of future results or values, which may be significantly more or less
favorable than those suggested by such analyses. In addition, analyses relating
to the value of businesses or securities do not purport to be appraisals or to
reflect the prices at which businesses or securities actually may be sold.
Accordingly, such estimates are inherently subject to substantial uncertainty.
CS First Boston's opinion (together with the related financial analyses) was
only one of many factors considered by the HI Board in its evaluation of the
Transaction and should not be viewed as determinative of the views of the HI
Board or management with respect to the Merger Consideration or the Transaction.
    
 
     The following is a summary of the analyses performed by CS First Boston in
connection with its presentation to the HI Board on August 9, 1996.
 
     DISCOUNTED CASH FLOW ANALYSIS. CS First Boston calculated ranges of
enterprise value for the Distribution Businesses (Entex, Arkla and Minnegasco),
the Pipeline Businesses (NorAm Gas Transmission Company and Mississippi River
Transmission Corporation), the Gathering Business (NFS) and the Marketing
Businesses (NES and NEM) of NorAm (each a "NorAm Business" and together, the
"NorAm Businesses"), based upon the present value of each NorAm Business'
10-year stream of forecasted unlevered free cash flows and fiscal year 2006
terminal value. The fiscal year 2006 terminal value was calculated using a range
of multiples of fiscal year 2006 operating cash flow ("EBITDA") of each NorAm
Business. The range of terminal multiples was selected primarily based on the
trading multiples of companies operating in businesses similar to those of each
NorAm Business. In conducting its analysis, CS First Boston relied on
 
                                       38
<PAGE>   46
 
   
certain assumptions relating to volume growth, gross margin, return on equity
and capital expenditures of the NorAm Businesses provided by HI's management.
For the Distribution Businesses, CS First Boston applied discount rates ranging
from 8.0% to 8.5%, reflecting the weighted average cost of capital, and
multiples of terminal EBITDA ranging from 7.5x to 8.5x. For the Pipeline
Businesses, CS First Boston applied discount rates ranging from 8.5% to 9.0%,
reflecting the weighted average cost of capital, and multiples of terminal
EBITDA ranging from 7.0x to 8.0x. CS First Boston applied discount rates ranging
from 9.0% to 10.0% and multiples of terminal EBITDA ranging from 8.0x to 9.0x
for the Gathering Business, and discount rates of 10.0% to 12.0% and multiples
of terminal EBITDA ranging from 7.0x to 8.0x for NES. CS First Boston applied
discount rates ranging from 8.9% to 9.9% and a perpetuity methodology to the
terminal free cash flow of NEM. This analysis resulted in an enterprise
valuation reference range for the Distribution Businesses of approximately
$1,655 million to $1,840 million, the Pipeline Businesses of approximately
$1,175 million to $1,275 million, and the Gathering and Marketing Businesses of
approximately $507 million to $571 million. On an aggregate basis, the
Discounted Cash Flow analyses for the Distribution, Pipeline and Gathering and
Marketing Businesses of NorAm indicated an enterprise valuation reference range
of approximately $3,337 million to $3,686 million and an equity valuation
reference range per share (fully diluted) for NorAm of approximately $13.68 to
$16.01.
    
 
     CS First Boston also calculated ranges of enterprise value for the electric
utility business and the international independent power business of HI (each an
"HI Business" and together, the "HI Businesses"). In conducting its analysis, CS
First Boston relied on certain assumptions relating to sales growth, operating
margins, return on equity and capital expenditures of the HI Businesses provided
by HI's management.
 
   
     COMPARABLE COMPANIES ANALYSIS. CS First Boston reviewed and compared
certain actual and forecasted financial and operating information of the
Distribution Businesses with comparable information of the following publicly
traded companies in the natural gas distribution industry: Atlanta Gas Light,
Brooklyn Union Gas, MCN Corp., NICOR Inc., Pacific Enterprises and Washington
Gas Light (the "Distribution Comparable Companies"). In addition, CS First
Boston reviewed and compared certain actual and forecasted financial and
operating information of the Pipeline Businesses with comparable information of
the following publicly traded companies in the interstate natural gas
transmission industry: Coastal Corp., El Paso Natural Gas, Enron Corp., Pan
Energy Corp., Sonat Inc. and The Williams Companies, Inc. (the "Pipeline
Comparable Companies"). Finally, CS First Boston reviewed and compared certain
actual and forecasted financial and operating information of the Gathering and
Marketing Businesses with comparable information of the following publicly
traded companies in the natural gas gathering, processing and marketing ("GPM")
industry: Aquila Gas Pipeline Corporation, Delhi Group, KN Energy, NGC
Corporation, TPC Corp. (formerly, Tejas Power Corporation), Tejas Gas
Corporation and Western Gas Resources, Inc. (the "GPM Comparable Companies" and,
together with the Distribution Comparable Companies and the Pipeline Comparable
Companies, the "Comparable Companies").
    
 
   
     CS First Boston selected these companies based on their activity in
businesses comparable to the NorAm Businesses. CS First Boston derived multiples
of enterprise value relative to EBITDA and earnings before interest and taxes
("EBIT") for the Comparable Companies based on (i) the latest twelve-month
period ending March 31, 1996 ("LTM") and (ii) forecasts for the 1996 calendar
year ("1996E"). CS First Boston then calculated imputed enterprise values for
the NorAm Businesses by applying LTM and 1996E EBITDA and EBIT for each NorAm
Business to the multiples derived from its analysis of the Comparable Companies.
This analysis resulted in an enterprise valuation reference range for the
Distribution Businesses of approximately $1,700 million to $2,000 million, the
Pipeline Businesses of approximately $1,025 million to $1,175 million, and the
Gathering and Marketing Businesses of approximately $467 million to $536
million. On an aggregate basis, the Comparable Companies analyses for the
Distribution, Pipeline and Gathering and Marketing Businesses of NorAm indicated
an enterprise valuation reference range of approximately $3,192 million to
$3,711 million and an equity valuation reference range per share (fully diluted)
for NorAm of approximately $12.72 to $16.18. All forecasted EBITDA and EBIT
multiples for the Comparable Companies were based on information contained in
equity research reports. The enterprise values of the Comparable Companies used
in the foregoing analyses were based on closing stock prices as of August 5,
1996. CS First Boston also reviewed and compared certain actual and forecasted
financial and operating
    
 
                                       39
<PAGE>   47
 
information of the HI Businesses with comparable information of selected
publicly traded companies in the electric utility industry (the "Electric
Utility Comparables") and the independent power producer industry (the "IPP
Comparables").
 
   
     COMPARABLE ACQUISITIONS ANALYSIS. Using publicly available information, CS
First Boston analyzed the purchase prices and multiples paid in the following
transactions in the natural gas distribution industry: the proposed acquisition
of United Cities Gas by Atmos Energy, the proposed acquisition of ENSERCH by
Texas Utilities, the proposed acquisition of Washington Energy by Puget Sound
Power & Light and the acquisition of Wisconsin Southern Gas by Wisconsin Energy
(the "Distribution Comparable Acquisitions"). CS First Boston also analyzed the
purchase prices and multiples paid in the following transactions in the
interstate natural gas transmission industry: the proposed acquisition of
Tenneco Energy by El Paso Natural Gas, the acquisition of Kern River by The
Williams Companies, the acquisition of Transco Energy by The Williams Companies,
the acquisition of United Gas Pipe Line by Koch Industries and the acquisition
of Texas Eastern by Panhandle Eastern (the "Pipeline Comparable Acquisitions").
Finally, CS First Boston also analyzed the purchase prices and multiples paid in
the following transactions in the natural gas gathering, processing and
marketing industry: the proposed acquisition of Transok by Tejas Gas, the
acquisition of Hadson by LG&E, the acquisition of Trident NGL by Natural Gas
Clearinghouse and the acquisition of Associated Natural Gas by Panhandle Eastern
(the "GPM Comparable Acquisitions"). CS First Boston selected these acquisitions
based on the activity of the acquired companies in businesses comparable to that
of the NorAm Businesses. CS First Boston calculated the adjusted purchase price
(purchase price plus total assumed debt less assumed cash) as a multiple of
EBITDA and EBIT of each acquired company for the latest available twelve-month
period immediately preceding the announcement of the acquisition of such
company. CS First Boston then calculated imputed enterprise values of the NorAm
Businesses by applying LTM EBITDA and LTM EBIT for each NorAm Business to the
multiples derived from its analysis of the acquired companies. This analysis
resulted in an enterprise valuation reference range for the Distribution
Businesses of approximately $2,000 million to $2,350 million, the Pipeline
Businesses of approximately $1,050 million to $1,200 million, and the Gathering
and Marketing Businesses of approximately $457 million to $556 million. On an
aggregate basis, the Comparable Acquisitions analyses for the Distribution,
Pipeline and Gathering and Marketing Businesses of NorAm indicated an enterprise
valuation reference range of approximately $3,507 million to $4,106 million and
an equity valuation reference range per share (fully diluted) for NorAm of
approximately $14.82 to $18.81. CS First Boston also calculated imputed
enterprise values of HI by applying LTM EBITDA and EBIT results for HI to the
multiples derived from its analyses of selected comparable acquisitions in the
electric utility and IPP industries.
    
 
     REFERENCE VALUE RANGE. The results of the Discounted Cash Flow, Comparable
Companies and Comparable Acquisitions analyses for the Distribution, Pipeline
and Gathering and Marketing Businesses of NorAm indicated an enterprise
valuation reference range of approximately $3,352 million to $3,841 million and
an equity valuation reference range per share (fully diluted) for NorAm of
approximately $13.78 to $17.04.
 
     RELATIVE CONTRIBUTION ANALYSIS. Using 1995 actual data and 1997 forecasted
data provided by HI and NorAm, CS First Boston analyzed the contribution
attributable to NorAm to the revenues, EBITDA, EBIT, net capital employed and
total assets of HI following the Transaction and compared it to the exchange
ratio implied by comparing the current market price of HI Common Stock as of
August 6, 1996 ($23.50) to the proposed Merger Consideration of $16.00 per NorAm
share. The actual results achieved by the combined company may vary from
forecasted results, and the variations may be material.
 
     PRO FORMA MERGER ANALYSIS. CS First Boston also analyzed certain pro forma
effects projected to result from the transaction, based upon financial forecasts
provided by HI's and NorAm's management and after giving effect to HI
management's net pre-tax cost savings estimates and certain assumptions as to,
among other things, the number of shares outstanding in each respective period.
CS First Boston was advised by the management of HI that the transaction will be
accounted for as a purchase under generally accepted accounting principles. This
analysis indicated that the transaction would be dilutive to the EPS of HI for
fiscal year 1997 and accretive to the EPS of HI for fiscal years 1998, 1999 and
2000. CS First Boston also reviewed certain 1997, 1998, 1999 and 2000 estimated
financial coverage ratios of the combined entity resulting from the Transaction,
including EBITDA to estimated interest expense, EBIT to estimated interest
expense and
 
                                       40
<PAGE>   48
 
estimated total debt to total book capitalization. In this analysis, CS First
Boston assumed that both HI and NorAm would perform substantially in accordance
with earnings forecasts provided to CS First Boston by HI's and NorAm's
management. The actual results achieved by the combined company may vary from
projected results and the variations may be material.
 
     MISCELLANEOUS. Pursuant to the terms of CS First Boston's engagement, HI
has agreed to pay CS First Boston for its services in connection with the
Transaction an aggregate transaction fee of $9.5 million, payable as follows:
(i) $250,000 payable upon execution of the engagement letter (the "Financial
Advisory Fee"), (ii) $1 million payable upon the rendering of CS First Boston's
oral fairness opinion to the HI Board on August 9, 1996 (the "Opinion Fee"),
(iii) $3 million payable upon public announcement of the Merger Agreement on
August 12, 1996 (the "Additional Fee"), against which the Opinion Fee was
credited, and (iv) a transaction fee of 0.25% of the aggregate consideration
(the "Transaction Fee"), payable upon the closing of HI's acquisition of all or
a substantial amount of the assets or capital stock of NorAm, against which the
previously paid fees are creditable. HI has also agreed to reimburse CS First
Boston for its reasonable out-of-pocket expenses, including the fees and
expenses of legal counsel and any other advisor retained by CS First Boston, and
to indemnify CS First Boston and certain related entities against certain
liabilities, including liabilities under the federal securities laws.
 
     In the ordinary course of business, CS First Boston and its affiliates may
actively trade the debt and equity securities of HI and NorAm for their own
account and for accounts of customers and, accordingly, may at any time hold a
long or short position in such securities. CS First Boston in the past has
provided financial advisory and investment banking services to HI and NorAm
unrelated to the Transaction, for which services CS First Boston has received
compensation, and may provide additional services to HI in the future.
 
OPINION OF NORAM'S FINANCIAL ADVISOR
 
     Merrill Lynch has acted as exclusive financial adviser to NorAm in
connection with the NorAm Merger and has assisted the Board of Directors of
NorAm in its examination of the fairness, from a financial point of view, of the
Merger Consideration to be received by NorAm stockholders in the NorAm Merger.
As described herein, Merrill Lynch's opinion dated August 11, 1996 (together
with the related presentations) to the NorAm Board of Directors was only one of
the many factors taken into consideration by the NorAm Board of Directors in
making its determination to approve the Merger Agreement.
 
     On August 11, 1996, Merrill Lynch delivered its oral opinion to the NorAm
Board of Directors (subsequently confirmed in writing as of such date) to the
effect that as of such date and based upon and subject to certain matters stated
therein, the Merger Consideration to be received by NorAm stockholders in the
NorAm Merger, taken as a whole, was fair to NorAm stockholders from a financial
point of view.
 
   
     THE FULL TEXT OF MERRILL LYNCH'S WRITTEN OPINION DATED AUGUST 11, 1996,
WHICH SETS FORTH THE ASSUMPTIONS MADE, MATTERS CONSIDERED AND LIMITATIONS ON
REVIEW UNDERTAKEN, IS ATTACHED AS APPENDIX C TO THIS JOINT PROXY
STATEMENT/PROSPECTUS AND IS INCORPORATED HEREIN BY REFERENCE. MERRILL LYNCH'S
OPINION IS DIRECTED TO THE BOARD OF DIRECTORS OF NORAM AND ADDRESSES THE
FAIRNESS OF THE MERGER CONSIDERATION TO BE RECEIVED BY STOCKHOLDERS OF NORAM IN
THE NORAM MERGER, TAKEN AS A WHOLE, FROM A FINANCIAL POINT OF VIEW. IT DOES NOT
ADDRESS ANY OTHER ASPECT OF THE TRANSACTION (INCLUDING WHETHER ANY PARTICULAR
MIX OF CASH CONSIDERATION OR STOCK CONSIDERATION IS FAIR TO NORAM STOCKHOLDERS)
OR ANY RELATED TRANSACTION AND DOES NOT CONSTITUTE A RECOMMENDATION TO ANY
STOCKHOLDER AS TO HOW SUCH STOCKHOLDER SHOULD VOTE AT THE NORAM SPECIAL MEETING.
THE SUMMARY OF THE OPINION OF MERRILL LYNCH SET FORTH IN THIS JOINT PROXY
STATEMENT/PROSPECTUS IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE FULL TEXT
OF SUCH OPINION.
    
 
     In connection with its opinion, Merrill Lynch reviewed the Merger Agreement
and certain publicly available business and financial information relating to
NorAm and HI. Merrill Lynch also reviewed certain other information, including
financial forecasts, provided to Merrill Lynch by NorAm and HI and met with the
respective managements of NorAm and HI to discuss the businesses and prospects
of NorAm and HI. Merrill Lynch also considered certain financial and stock
market data of NorAm and HI and compared that data with similar data for other
publicly held companies in businesses similar to those of NorAm and HI and
considered, to the extent publicly available, the financial terms of certain
other business combinations that
 
                                       41
<PAGE>   49
 
recently have been effected. Merrill Lynch also considered such other
information, financial studies, analyses and investigations and financial,
economic and market criteria that Merrill Lynch deemed relevant.
 
     In connection with its review, Merrill Lynch did not assume any
responsibility for independent verification of any of the information provided
to or otherwise reviewed by Merrill Lynch and relied upon such information being
complete and accurate in all material respects. With respect to the financial
forecasts, Merrill Lynch assumed that such forecasts were reasonably prepared on
bases reflecting the best currently available estimates and judgments of the
managements of NorAm and HI as to the future financial performance of NorAm and
HI, respectively. In addition, Merrill Lynch did not make an independent
evaluation or appraisal of the assets or liabilities (contingent or otherwise)
of NorAm or HI, nor was Merrill Lynch furnished with any such evaluations or
appraisals. Merrill Lynch assumed that the NorAm Merger will be accounted for as
a purchase by Houston, that it qualifies as a reorganization under Section
368(a) of the Code, and that the Stock Consideration will be tax free to the
recipients thereof who receive all Stock Consideration. Merrill Lynch's opinion
was necessarily based on information available to it and on general economic,
financial, stock market, monetary and other conditions as they existed and could
be evaluated on the date of its opinion. Merrill Lynch expressed no opinion as
to what the value of the HI Common Stock actually would be when issued to
NorAm's stockholders pursuant to the NorAm Merger or the prices at which the HI
Common Stock would trade subsequent to the NorAm Merger. Although Merrill Lynch
evaluated the Merger Consideration from a financial point of view, Merrill Lynch
was not requested to, and did not, recommend the specific consideration payable
in the NorAm Merger.
 
     In preparing its opinion for the Board of Directors of NorAm, Merrill Lynch
performed a variety of financial and comparative analyses, including those
described below. The summary of analyses performed by Merrill Lynch as set forth
below does not purport to be a complete description of the analyses underlying
Merrill Lynch's opinion. The preparation of a fairness opinion is a complex
analytic process involving various determinations as to the most appropriate and
relevant methods of financial analyses and the application of those methods to
the particular circumstances and, therefore, such an opinion is not readily
susceptible to partial or summary description. No company, business or
transaction used in such analyses as a comparison is identical to HI, NorAm or
the Transaction, nor is an evaluation of the results of such analyses entirely
mathematical; rather, it involves complex considerations and judgments
concerning financial and operating characteristics and other factors that could
affect the acquisition, public trading or other values of the companies,
business segments or transactions being analyzed. The estimates contained in
such analyses and the ranges of valuations resulting from any particular
analysis are not necessarily indicative of actual values or predictive of future
results or values, which may be significantly more or less favorable than those
suggested by such analyses. In addition, analyses relating to the value of
businesses or securities do not purport to be appraisals or to reflect the
prices at which businesses, companies or securities actually may be sold.
Accordingly, such analyses and estimates are inherently subject to substantial
uncertainty.
 
     In arriving at its opinion, Merrill Lynch made qualitative judgments as to
the significance and relevance of each analysis and factor considered by it.
Accordingly, Merrill Lynch believes that its analyses must be considered as a
whole and that selecting portions of its analyses and factors, without
considering all analyses and factors, could create an incomplete view of the
processes underlying such analyses and its opinion. In its analyses, Merrill
Lynch made numerous assumptions with respect to HI, NorAm, industry performance,
and with respect to regulatory, general business, economic, market and financial
conditions, as well as other matters, many of which are beyond the control of HI
and NorAm, and involve the application of complex methodologies and educated
judgment.
 
     The following is a summary of the material analyses performed by Merrill
Lynch and presented to the Board of Directors of NorAm and is based upon the
relative values suggested by such analyses, in light of the judgment and
experience of Merrill Lynch.
 
     DISCOUNTED CASH FLOW ANALYSIS. Merrill Lynch performed a discounted cash
flow analysis of the future unleveraged free cash flows that NorAm's businesses
could be expected to generate during various periods utilizing projections
provided to Merrill Lynch by NorAm and certain other assumptions.
 
                                       42
<PAGE>   50
 
     In conjunction with NorAm, Merrill Lynch utilized the information provided
and various assumptions regarding future allowed returns on equity, debt costs,
capital structures, book and tax depreciation rates and capital expenditures, to
project financial results for NorAm's natural gas distribution operations,
natural gas pipeline operations, natural gas gathering operations and energy
services operations through the year 2006. A terminal value of between 6.0x to
8.0x EBITDA was assigned to each of such businesses. The estimated future
unleveraged free cash flows generated in the analysis of NorAm's natural gas
distribution operations, natural gas pipeline operations and natural gas
gathering operations were discounted at after-tax discount rates of between 10%
and 12%, and such cash flows generated by its energy services operations were
discounted at after-tax discount rates of between 10% and 14%, producing a
reference enterprise valuation for NorAm of approximately $2,600 million to
$3,600 million.
 
     ANALYSIS OF SELECTED COMPARABLE ACQUISITIONS. Merrill Lynch also reviewed
publicly available information relating to certain merger and acquisition
transactions in respect of companies with primarily natural gas distribution
operations, companies with primarily natural gas pipeline operations, companies
with primarily natural gas gathering operations and companies with primarily
energy services operations. With respect to NorAm taken as a whole and to its
various businesses, Merrill Lynch examined multiples of the value of the common
equity and indebtedness assumed in each of the transactions to, among other
measures, such acquired companies' respective earnings before interest, taxes
and depreciation ("EBITDA") and EBIT, and examined multiples of the value of the
common equity in each of the transactions to, among other measures, net income
and book value.
 
     The transactions in the natural gas distribution industry that Merrill
Lynch reviewed were Atmos Energy Corporation's acquisition of Western Kentucky
Gas (June 1987), Consolidated Natural Gas Co.'s acquisition of Virginia Natural
Gas Corp. (June 1989), British Gas plc's acquisition of Consumers Gas (March
1990), Arkla Inc.'s acquisition of Diversified Energy Inc. (July 1990), New York
Electric & Gas Corporation's acquisition of Columbia Gas of New York (August
1990), Citizens Utility Company's acquisition of La. General Services (September
1990), NIPSCO Industries, Inc.'s acquisition of Kokomo Gas & Fuel Co. (February
1992), NIPSCO Industries, Inc.'s acquisition of Northern Indiana Fuel & Light
(November 1992), Atmos Energy Corporation's acquisition of Greeley Gas Company
(March 1993), Puget Sound Power & Light Company's acquisition of Washington
Energy Company (October 1995) and Atmos Energy Corporation's proposed
acquisition of United Cities Gas Company (July 1996) (the "Comparable
Distribution Transactions"). For each of the Comparable Distribution
Transactions, relevant transaction multiples were analyzed. These transaction
multiples consisted of (i) the value of the common equity divided by the latest
twelve months ("LTM") earnings (the "Earnings Multiple"), (ii) the value of the
common equity divided by the book value (the "Book Value Multiple"), (iii) the
transaction value, as defined by the value of the common equity plus the
liquidation value of any preferred stock plus the principal amount of any debt
less cash, divided by the LTM EBITDA (the "EBITDA Multiple"), and (iv) the
transaction value divided by the LTM EBIT (the "EBIT Multiple"). In order to
determine an enterprise valuation range for NorAm's natural gas distribution
operations, the LTM financial results of such operations were multiplied by the
appropriate multiple ranges generated by the analysis described above. The
appropriate Earnings Multiple range was determined to be 15.0x to 18.0x. Such
multiples were applied to the distribution operations' LTM unleveraged net
income of $113.1 million to produce an enterprise valuation range of $1,696.5
million to $2,035.8 million. Merrill Lynch determined that the appropriate Book
Value Multiple range was 2.0x to 2.5x. These multiples were applied to the
distribution operations' book value of $602.9 million to produce an equity value
range of $1,205.8 million to $1,507.3 million. The implied debt of the
distribution operations of $444.2 million was added thereto, to produce the
enterprise valuation range of $1,650.0 million to $1,951.5 million. The
appropriate range of EBITDA Multiples and EBIT Multiples was determined to be
7.0x to 8.5x and 9.5x to 12.5x, respectively. Such multiples were applied to the
distribution operations' LTM EBITDA and EBIT of $281.1 million and $188.5
million, respectively, to produce enterprise valuation ranges of $1,967.7
million to $2,389.4 million and $1,790.8 million to $2,356.2 million.
 
     The transactions in the natural gas pipeline industry that Merrill Lynch
reviewed were Transco Energy Company's acquisition of Texas Gas Transmission
Corporation (December 1988), Koch Industries' acquisition of United Gas Pipeline
Corp. (December 1992), North States Power's acquisition of Viking Transmission
 
                                       43
<PAGE>   51
 
Corporation (June 1993), The Williams Companies, Inc.'s acquisition of Transco
Energy Company (May 1995), The Williams Companies, Inc.'s acquisition of 50% of
Kern River Gas Transmission Corporation (January 1996), El Paso Natural Gas
Company's proposed acquisition of Tenneco Energy and Coastal Corp.'s proposed
acquisition of Iroquois Pipeline (the "Comparable Pipeline Transactions"). For
each of the Comparable Pipeline Transactions, relevant transaction multiples
were analyzed. These transaction multiples consisted of (i) the Earnings
Multiple, (ii) the EBITDA Multiple and (iii) the EBIT Multiple. In order to
determine an enterprise valuation range for NorAm's natural gas pipeline
operations, the LTM financial results of such operations were multiplied by the
appropriate multiple ranges generated by the analysis described above. Merrill
Lynch determined that the appropriate Earnings Multiple range was 10.5x to
12.5x. Such multiples were applied to the natural gas pipeline operations' LTM
net income of $68.0 million to produce an enterprise value range of $714.0
million to $850.0 million. The appropriate range of EBITDA Multiples and EBIT
Multiples was determined to be 6.5x to 7.5x and 8.0x to 10.0x, respectively.
Such multiples were applied to the natural gas pipeline operations' LTM EBITDA
and EBIT of $143.6 million and $113.3 million, respectively, to produce
enterprise valuation ranges of $933.4 million to $1,077.0 million and $906.4
million to $1,133.0 million.
 
     With respect to transactions in the natural gas gathering industry, Merrill
Lynch reviewed KN Energy Inc.'s acquisition of American Oil & Gas Corp. (March
1994), Red Cedar Gathering's acquisition of West Gas Gathering (August 1994),
NGC Corporation's acquisition of Trident NGL, Inc. (August 1994), PanEnergy
Company's acquisition of Associated Natural Gas Corp. (December 1994), The
Williams Companies, Inc.'s acquisition of Gas Company of New Mexico (June 1995),
El Paso Natural Gas Company's acquisition of Cornerstone Natural Gas, Inc. (June
1996), Tejas Gas Corporation's acquisition of Transok, Inc. (June 1996), NGC
Corporation's acquisition of Midstream Combination Corp. (August 1996) and
PanEnergy Company's acquisition of Mobil Natural Gas (August 1996) (the
"Comparable Gathering Transactions"). For each of the Comparable Gathering
Transactions, EBITDA Multiples and EBIT Multiples were analyzed. In order to
determine an enterprise valuation range for NorAm's natural gas gathering
operations, the LTM financial results of such operations were multiplied by the
appropriate multiple ranges generated by the analysis described above. The
appropriate range of EBITDA Multiples and EBIT Multiples was determined to be
9.5x to 10.5x and 13.5x to 17.0x, respectively. Such multiples were applied to
the natural gas gathering operations' LTM EBITDA and EBIT of $13.0 million and
$10.9 million, respectively, to produce enterprise valuation ranges of $123.5
million to $136.5 million and $147.2 million to $185.3 million.
 
     Finally, the transactions in the energy services industry that Merrill
Lynch reviewed were Associated Natural Gas Corp.'s acquisition of Grand Valley
Gas Company (February 1995), LG & E Corp.'s acquisition of Hadson Corp. (May
1995), El Paso Natural Gas Company's acquisition of Eastex Energy Inc. (May
1995) and AGL Resources' acquisition of Sonat Gas Marketing (August 1995) (the
"Comparable Energy Services Transactions"). For each of the Comparable Energy
Services Transactions, EBITDA Multiples and EBIT Multiples were analyzed. In
order to determine an enterprise valuation range for NorAm's energy services
operations, the LTM financial results of such operations were multiplied by the
appropriate multiple ranges generated by the analysis described above. The
appropriate range of EBITDA Multiples and EBIT Multiples was determined to be
8.0x to 12.0x and 8.0x to 12.0x, respectively. Such multiples were applied to
the energy services operations' LTM EBITDA and EBIT of $40.5 million and $38.7
million, respectively, to produce enterprise valuation ranges of $324.0 million
to $486.0 million and $309.6 million to $464.4 million.
 
     Because the reasons for, and circumstances surrounding, each of the
transactions analyzed were so diverse and due to the inherent differences
between the operations and financial conditions of NorAm and the selected
companies, Merrill Lynch believes that a purely quantitative comparable
transaction analysis would not be dispositive in the context of the NorAm
Merger. Merrill Lynch further believes that an appropriate use of a comparable
transaction analysis in this instance involves qualitative judgments concerning
the differences between the characteristics of these transactions and the NorAm
Merger that would affect the value of the acquired companies and businesses and
NorAm, which judgments are reflected in Merrill Lynch's opinion.
 
     ANALYSIS OF SELECTED PUBLICLY TRADED COMPARABLE COMPANIES. Using publicly
available information, Merrill Lynch compared selected historical stock,
financial and operating ratios for each of NorAm's natural
 
                                       44
<PAGE>   52
 
gas distribution, natural gas pipeline, natural gas gathering and energy
services operations with respective corresponding data and ratios of certain
similar publicly traded companies. These companies were selected by Merrill
Lynch from the universe of possible companies based upon Merrill Lynch's views
as to the comparability of financial and operating characteristics of these
companies to NorAm and HI. With respect to each such analysis, Merrill Lynch
made such comparisons among the following companies: AGL Resources, Inc., The
Brooklyn Union Gas Company, NICOR, Inc., Pacific Enterprises, Peoples Energy
Corporation and Washington Gas and Light Company (the "Comparable Distribution
Companies"); El Paso Natural Gas Company, PanEnergy, TransCanada Pipelines
Limited and The Williams Companies, Inc. (the "Comparable Pipeline Companies");
Aquila Gas Pipeline Corporation, NGC Corporation, Tejas Gas Corporation, TPC
Corp. (formerly Tejas Power Corporation) and Western Gas Resources, Inc. (the
"Comparable Gathering Companies"); Aquila Gas Pipeline Corporation, NGC
Corporation, Tejas Gas Corporation, TPC Corp. and Western Gas Resources, Inc.
(the "Comparable Energy Services Companies" and together with the Comparable
Distribution Companies, the Comparable Pipeline Companies and the Comparable
Gathering Companies, the "Comparable Companies").
 
     With respect to the Comparable Distribution Companies, the EBITDA Multiple,
EBIT Multiple, Earnings Multiple and Book Value Multiples were calculated based
on 1996 projected financial results. In order to determine an enterprise
valuation range for NorAm's natural gas distribution operations utilizing
comparable company trading analysis, the LTM financial results of NorAm's
natural gas distribution operations were multiplied by appropriate multiple
ranges for each financial measure mentioned previously. Merrill Lynch determined
that the appropriate Earnings Multiple and Book Value Multiple ranges were 13.0x
to 14.5x and 1.5x to 2.0x, respectively. Such multiples were applied to the
natural gas distribution operations' LTM unleveraged net income of $113.1
million and book value of $602.9 million to produce enterprise valuation ranges
of $1,470.3 million to $1,639.9 million and $1,348.6 million to $1,650.0
million, respectively. The appropriate ranges of EBITDA Multiples and EBIT
Multiples were determined to be 6.0x to 7.5x and 9.5x to 10.5x, respectively.
Such multiples were applied to the natural gas distribution operations' LTM
EBITDA and EBIT of $281.1 million and $188.5 million, respectively, to produce
enterprise valuation ranges of $1,686.6 million to $2,108.3 million and $1,790.8
million to $1,979.3 million, respectively.
 
     With respect to the Comparable Pipeline Companies, the EBITDA Multiple,
EBIT Multiple and Earnings Multiple based on 1996 projected financial results
were calculated. In order to determine an enterprise valuation range for NorAm's
natural gas pipeline operations based on comparable company trading analysis,
the LTM financial results of NorAm's natural gas pipeline operations were
multiplied by appropriate multiple ranges for each financial measure mentioned
previously. Merrill Lynch determined that the appropriate Earnings Multiple
range was 14.0x to 15.0x. Such multiples were applied to the natural gas
pipeline operations' LTM unleveraged net income of $68.0 million to produce an
enterprise valuation range of $952.0 million to $1,020.0 million. The
appropriate ranges of EBITDA Multiples and EBIT Multiples were determined to be
7.0x to 8.0x and 10.5x to 11.5x, respectively. Such multiples were applied to
the natural gas pipeline operations' LTM EBITDA and EBIT of $143.6 million and
$113.3 million, respectively, to produce enterprise valuation ranges of $1,005.2
million to $1,148.8 million and $1,189.7 million to $1,303.0 million,
respectively.
 
     With respect to the Comparable Gathering Companies, the EBITDA Multiple and
EBIT Multiple based on 1996 projected financial results were calculated. In
order to determine an enterprise valuation range for NorAm's natural gas
gathering operations based on comparable company trading analysis, the LTM
financial results of NorAm's natural gas gathering operations were multipled by
appropriate multiple ranges for each financial measure mentioned previously. The
appropriate ranges of EBITDA Multiples and EBIT Multiples were determined to be
7.0x to 9.0x and 13.0x to 14.5x, respectively. Such multiples were applied to
the natural gas gathering operations' LTM EBITDA and EBIT of $13.0 million and
$10.9 million, respectively, to produce enterprise valuation ranges of $91.0
million to $117.0 million and $141.7 million to $158.1 million, respectively.
 
     With respect to the Comparable Energy Services Companies, the EBITDA
Multiple and EBIT Multiple based on 1996 projected financial results were
calculated. In order to determine an enterprise valuation range for NorAm's
energy services operations based on comparable company trading analysis, the LTM
financial
 
                                       45
<PAGE>   53
 
results of NorAm's energy services operations were multiplied by appropriate
multiple ranges for each of the aforementioned financial measures. The
appropriate ranges of EBITDA Multiples and EBIT Multiples were determined to be
7.0x to 9.0x and 13.0x to 14.5x, respectively. Such multiples were applied to
the energy services operations' LTM EBITDA and EBIT of $40.5 million and $38.7
million, respectively, to produce enterprise valuation ranges of $283.5 million
to $364.5 million and $503.1 million to $561.1 million, respectively.
 
     Because of the inherent differences among the operations of NorAm and the
selected Comparable Companies, Merrill Lynch believes that a purely quantitative
comparable company analysis would not be dispositive in the context of the NorAm
Merger. Merrill Lynch further believes that an appropriate use of a comparable
company analysis in this instance involves qualitative judgments concerning
differences among the financial and operating characteristics of NorAm and the
selected Comparable Companies, which judgments are reflected in Merrill Lynch's
opinion.
 
     PURCHASE PRICE ANALYSIS AND STOCK TRADING HISTORY. Merrill Lynch performed
analyses relating to the NorAm Merger Consideration to be paid assuming various
prices for the HI Common Stock. Merrill Lynch also examined the history of
trading prices and volume for the NorAm Common Stock and the HI Common Stock and
various historical information relating to such common stocks.
 
   
     MERGER PREMIUM ANALYSES. Merrill Lynch also reviewed certain recent mergers
and acquisitions with equity values greater than $1,000 million in a variety of
industries (i) from January 1994 through July 1996, (ii) from January 1995
through July 1996 and (iii) from January 1996 through July 1996, and examined
the premiums paid for the targets' equity over the targets' equity market value
prior to announcement of the transactions. Such analysis indicated average
premiums over the targets' stock prices one day, one week and four weeks before
the announcement of each respective acquisition in the period examined of (i)
33.3%, 35.7% and 38.9%, (ii) 30.9%, 33.6% and 37.7% and (iii) 32.7%, 37.0% and
39.3%, respectively. This compared to premiums of NorAm Common Stock price for
similar periods before the announcement of the NorAm Merger of 37.6%, 45.5% and
41.7%, respectively. Merrill Lynch believes that the relative difference in
premium between the comparable transactions and the NorAm Merger may be due
largely to changes in market conditions and inherent differences between the
operations and financial conditions of NorAm and the selected acquisitions.
    
 
     PRO FORMA NORAM MERGER ANALYSIS. Merrill Lynch analyzed certain pro forma
effects which could result from the NorAm Merger, based on financial forecasts
provided by NorAm's management for NorAm's 1997 and 1998 fiscal years and
financial forecasts provided by HI's management for HI's 1997 and 1998 fiscal
years. Merrill Lynch was advised by the management of HI that the NorAm Merger
will be accounted for as a "purchase" under generally accepted accounting
principles. This analysis indicated that the NorAm Merger would be dilutive to
the forecasted earnings per share of HI for its 1997 and 1998 fiscal years and
accretive to NorAm stockholders on a relative basis for 1997 and 1998. Merrill
Lynch also analyzed the effects of the NorAm Merger on the balance sheet of the
combined company. The combined company's estimated debt to debt plus common
equity and preferred stock ratio as of December 31, 1997 would be 55.3% as
compared to 48.5% for HI on a stand-alone basis.
 
     VALUATION SUMMARY. Based upon the foregoing discounted cash flow analyses,
comparable acquisition analyses, comparable company analyses and other factors
considered, Merrill Lynch developed ranges of enterprise values for NorAm's
natural gas distribution operations of $1,800 million to $2,150 million, NorAm's
natural gas pipeline operations of $1,000 million to $1,150 million, NorAm's
natural gas gathering operations of $125 million to $150 million and NorAm's
energy services operations of $325 million to $450 million, for a total
enterprise range of $3,250 million to $3,900 million. From these totals, Merrill
Lynch deducted total debt and certain contingent liabilities of $1,412 million
to arrive at a range of equity values of $1,838 million to $2,488 million.
Assuming conversion of $172.5 million of Convertible Preferred Securities, the
range of equity values was divided by the number of shares of NorAm Common Stock
outstanding to produce a range of equity value per share of $12.18 to $16.49.
 
     OTHER FACTORS AND ANALYSES. In the course of preparing its opinion, Merrill
Lynch performed certain other analyses and reviewed certain other matters,
including, among other things, (i) trading characteristics of the
 
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<PAGE>   54
 
common stock of NorAm and HI, (ii) financing considerations relating to the
NorAm Merger and (iii) pro forma capitalization of the combined company.
 
   
     Merrill Lynch is an internationally recognized investment banking firm and,
as a part of its investment banking business, is regularly engaged in the
valuation of businesses and securities in connection with mergers and
acquisitions. The Board of Directors of NorAm selected Merrill Lynch as its
financial advisor because of Merrill Lynch's experience and expertise and
because it is familiar with NorAm and its business.
    
 
     Pursuant to the terms of Merrill Lynch's engagement, NorAm has agreed to
pay Merrill Lynch for its financial advisory services in connection with the
NorAm Merger fees payable as follows: (i) a financial advisory fee of $500,000,
payable upon a public announcement of an agreement; and (ii) a fee of
approximately $13.9 million (equal to 0.4% of the aggregate purchase price (as
defined in the engagement letter) to be paid on closing of the NorAm Merger,
less the $500,000 payment made upon public announcement of the agreement). NorAm
also has agreed to reimburse Merrill Lynch for its out-of-pocket expenses,
including the fees and expenses of legal counsel and any other adviser retained
by Merrill Lynch, and to indemnify Merrill Lynch against certain liabilities,
including liabilities under the federal securities laws, or to contribute to
payments Merrill Lynch may be required to make in respect thereof.
 
     In the ordinary course of business, Merrill Lynch and its affiliates may
actively trade the equity securities of NorAm and HI for their own account and
for accounts of customers and, accordingly, may at any time hold a long or short
position in such securities. Merrill Lynch has in the past provided financial
services to NorAm, including acting as co-manager for two public offerings in
1996, for which it received customary compensation.
 
CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
     The following discussion is a summary of the material United States federal
income tax consequences of the Transaction and is not intended to be a complete
discussion of all potential tax effects that might be relevant to the
Transaction. Such discussion deals only with U.S. Holders. This summary assumes
that each of HI Common Stock and NorAm Common Stock has been held as a capital
asset. It may not be applicable to certain classes of taxpayers, including,
without limitation, insurance companies, tax-exempt organizations, financial
institutions, securities dealers, broker-dealers, foreign persons, persons who
hold HI Common Stock or NorAm Common Stock as part of a conversion transaction,
and persons who acquired HI Common Stock or NorAm Common Stock pursuant to an
exercise of employee stock options or rights or otherwise as compensation.
Moreover, the state, local, foreign and estate tax consequences to HI
stockholders or NorAm stockholders of the Transaction are not discussed.
 
   
     This summary is based on laws, regulations, rulings, practice and judicial
decisions in effect at the date of this Joint Proxy Statement/Prospectus and the
opinion of Baker & Botts, L.L.P. However, legislative, judicial or
administrative changes or interpretations may be forthcoming that could alter or
modify the statements and conclusions set forth herein. Any such changes or
interpretations may or may not be retroactive and could affect the tax
consequences to stockholders as described herein. EACH STOCKHOLDER IS URGED TO
CONSULT WITH HIS OR HER OWN TAX ADVISOR AS TO THE PARTICULAR TAX CONSEQUENCES TO
THE HOLDER OF THE TRANSACTIONS DESCRIBED HEREIN, INCLUDING THE APPLICABILITY AND
EFFECT OF ANY STATE, LOCAL OR FOREIGN TAX LAWS, AND OF CHANGES IN APPLICABLE TAX
LAWS.
    
 
   
     GENERAL.  Each merger included in the Transaction will qualify as a
reorganization within the meaning of Section 368(a) of the Code. This conclusion
is based upon the assumption that the total amount of Cash Consideration paid to
holders of NorAm Common Stock will not exceed 58.7% of the sum of such Cash
Consideration and the value of the Stock Consideration. For purposes of the
foregoing computation,
    
 
   
          (i) In addition to Cash Consideration paid to the holders of NorAm
     Common Stock, Cash Consideration will also include (a) the amount of cash
     paid to holders of Dissenting Shares, (b) the amount of cash paid in lieu
     of fractional shares, (c) $16.00 per share of NorAm Common Stock, if any,
     held directly or indirectly by HI or NorAm and (d) the 2% simple interest
     per quarter payable if the Transaction is not consummated by May 11, 1997.
    
 
                                       47
<PAGE>   55
 
   
          (ii) The value of the Stock Consideration shall be determined based
     upon the average of the high and low trading price for HI or Houston Common
     Stock, as the case may be, on the Closing Date.
    
 
   
This conclusion is also based on the accuracy of certain representations of fact
made by HI, HL&P and NorAm.
    
 
   
     It is a condition to the Transaction that HI will have received a tax
opinion of Baker & Botts, L.L.P., counsel to HI and HL&P, in form and substance
satisfactory to HI, dated as of the Closing Date, to the effect that each merger
included in the Transaction will be treated as a reorganization within the
meaning of Section 368(a) of the Code and that NorAm shall have received a tax
opinion of Jones, Day, Reavis & Pogue, counsel to NorAm, in form and substance
satisfactory to NorAm, dated as of the Closing Date, to the effect that the
NorAm Merger should be treated as a reorganization within the meaning of Section
368(a) of the Code. An opinion is not binding on the Internal Revenue Service or
the courts, and, therefore, the delivery of such tax opinions cannot assure that
the Internal Revenue Service or the courts will treat any of the mergers
included in the Transaction as a reorganization within the meaning of Section
368(a) of the Code. Such tax opinions will be based, among other things, on
assumptions relating to certain facts and circumstances of, and the intentions
of the parties to, the Transaction, which assumptions will either (i) have been
made with the consent of HI or NorAm or (ii) be based upon certain
representations of fact made by HI, HL&P, Merger Sub, NorAm or certain
stockholders or members of management of HI or NorAm.
    
 
   
     HI, HL&P, MERGER SUB AND NORAM. No gain or loss will be recognized by HI,
HL&P, Merger Sub or NorAm as a result of the consummation of the Transaction.
    
 
     HI/HL&P MERGER.  A U.S. Holder of HI Common Stock who exchanges such U.S.
Holder's HI Common Stock for Houston Common Stock pursuant to the Transaction
will not recognize any gain or loss on such exchange. The aggregate adjusted tax
basis of such Houston Common Stock received will equal the U.S. Holder's
adjusted tax basis in the HI Common Stock surrendered.
 
     EXCHANGE OF NORAM COMMON STOCK SOLELY FOR CASH CONSIDERATION.  A U.S.
Holder of NorAm Common Stock who, pursuant to the Transaction, exchanges his or
her NorAm Common Stock solely for Cash Consideration generally will recognize
capital gain or loss in an amount equal to the difference between the amount of
Cash Consideration received by him or her and his or her adjusted tax basis in
the NorAm Common Stock surrendered therefor. Such capital gain or loss will be
long-term capital gain or loss if the U.S. Holder's holding period for the NorAm
Common Stock so surrendered is more than one year.
 
     EXCHANGE OF NORAM COMMON STOCK SOLELY FOR STOCK CONSIDERATION.  A U.S.
Holder of NorAm Common Stock who, pursuant to the Transaction, exchanges his or
her NorAm Common Stock solely for Stock Consideration will not recognize any
gain or loss on such exchange. The aggregate adjusted tax basis of the stock
received will equal the U.S. Holder's adjusted tax basis in the NorAm Common
Stock surrendered.
 
     EXCHANGE OF NORAM COMMON STOCK FOR BOTH CASH CONSIDERATION AND STOCK
CONSIDERATION.  A U.S. Holder of NorAm Common Stock who exchanges his or her
NorAm Common Stock for both Cash Consideration and Stock Consideration pursuant
to the Transaction will realize gain or loss equal to the difference between the
fair market value of the Merger Consideration received by him or her and his or
her adjusted tax basis in the NorAm Common Stock surrendered therefor. The U.S.
Holder's gain, if any, will be recognized, however, only to the extent of the
amount of Cash Consideration received by the U.S. Holder; any loss will not be
recognized. Generally, complicated rules apply for purposes of determining the
character of any such recognized gain. However, any gain recognized by a U.S.
Holder who receives both Cash Consideration and Stock Consideration will
probably be treated as capital gain. The aggregate adjusted tax basis of such
Houston Common Stock or HI Common Stock received will equal the U.S. Holder's
adjusted tax basis in the NorAm Common Stock surrendered, decreased by the
amount of Cash Consideration received by the U.S. Holder and increased by the
amount of gain recognized by the U.S. Holder, if any.
 
     HOLDING PERIOD OF THE HOUSTON COMMON STOCK OR THE HI COMMON STOCK.  The
holding period of the Houston Common Stock received by each U.S. Holder of HI
Common Stock who exchanges his or her HI Common Stock for Houston Common Stock
pursuant to the Transaction will include the holding period of
 
                                       48
<PAGE>   56
 
the HI Common Stock surrendered therefor. The holding period of the Houston
Common Stock or the HI Common Stock received by each U.S. Holder of NorAm Common
Stock in the Transaction will include the holding period of the NorAm Common
Stock surrendered therefor.
 
     FRACTIONAL SHARES.  No fractional shares of Houston Common Stock or HI
Common Stock will be issued pursuant to the Transaction. A U.S. Holder of NorAm
Common Stock who, pursuant to the Transaction, receives cash in lieu of a
fractional share of Houston Common Stock or HI Common Stock will be treated as
having received that fractional share of stock pursuant to the Transaction and
then as having received the cash in a redemption of the fractional share of
stock. The U.S. Holder will generally recognize capital gain or loss on the
deemed redemption equal to the difference between the amount of cash received
and the U.S. Holder's adjusted tax basis in the fractional share of Houston
Common Stock or HI Common Stock deemed surrendered therefor.
 
   
     NORAM DISSENTING SHARES. A U.S. Holder of Dissenting Shares who, pursuant
to the Transaction, receives payment for such shares generally will recognize
capital gain or loss in an amount equal to the difference between the amount of
such payment received by him or her and his or her adjusted tax basis in the
Dissenting Shares surrendered therefor. Such capital gain or loss will be
long-term capital gain or loss if the U.S. Holder's holding period for the
Dissenting Shares so surrendered is more than one year.
    
 
ACCOUNTING TREATMENT
 
     The acquisition of NorAm will be treated for accounting purposes in
accordance with the rules for purchase accounting, as a result of which the
assets and liabilities of NorAm will be recorded on Houston's books at their
estimated fair market values with the remaining purchase price reflected as
goodwill. See the Notes to the Unaudited Pro Forma Combined Condensed Financial
Statements included elsewhere in this Joint Proxy Statement/Prospectus.
 
FUNDING OF CASH CONSIDERATION
 
   
     The cash portion of the Merger Consideration (approximately $1.25 billion)
will be funded through bank borrowings under new bank credit facilities (the
"Bank Facilities") to be arranged by Houston or by a newly formed finance
subsidiary of Houston (the "Borrower") with a group of commercial banks. As of
the date hereof, the structure, terms and provisions of the Bank Facilities are
being negotiated with prospective lenders and have not yet been finalized.
    
 
   
     The Bank Facilities are expected to bear interest at a rate based upon
either the London Interbank Offered Rate plus a margin or a base rate plus a
margin or at a rate determined through a bidding process.
    
 
   
     The borrowings may be secured by liens on or first priority security
interests in assets, which may include (i) the shares of common stock of the
surviving corporation of the NorAm Merger held by Houston or its affiliates;
(ii) the shares of common and preferred stock of Time Warner Inc. currently
owned by HI, (iii) the capital stock of subsidiaries of the Borrower, to the
extent permitted by legal and contractual limitations and (iv) intercompany
notes evidencing any loans made by the Borrower to Houston or its direct or
indirect subsidiaries. The obligations under the Bank Facilities are not
expected to be secured by the utility properties of HL&P or NorAm.
    
 
   
     In order to provide liquidity to the Borrower to meet its financial
obligations, Houston may enter into a support agreement under which it would
agree to make cash capital contributions to the Borrower with excess cash flow
(with calculations, definitions and payment mechanics to be agreed upon).
Houston may also agree to certain covenants, including certain limitations on
the payment of dividends on or the repurchase of Houston Common Stock. The net
proceeds of any disposition of the Time Warner stock may be used to prepay
borrowings under the Bank Facilities, subject to a corresponding release by the
banks of their security interest in the Time Warner stock to the extent of any
such prepayment.
    
 
   
     The Bank Facilities will also contain customary covenants and default
provisions applicable to the Borrower and its subsidiaries, including the
ability of the Borrower and its subsidiaries to, among other things,
    
 
                                       49
<PAGE>   57
 
   
incur additional indebtedness (other than certain permitted indebtedness),
create liens and make investments or loans.
    
 
NORAM EMPLOYEE MATTERS
 
   
     NorAm adopted, on July 10, 1996, the NorAm Energy Corp. 1996 Special
Severance Policy (the "Special Policy") and the NorAm Energy Corp. 1996 General
Severance Policy (the "General Policy" and together with the Special Policy, the
"Policies") to provide severance benefits for eligible employees who are not
covered by individual severance agreements. Two executive officers of NorAm,
Dale C. Earwood and W. Craig Elias, are participants under the Special Policy.
The Transaction will constitute a "change in control" pursuant to the Policies.
Under the Policies, a participant generally becomes eligible for severance
benefits if, within two years following a change in control, the participant's
employment is terminated, except in the case of termination by (i) death, (ii)
permanent disability, (iii) NorAm or its successor company for cause (as defined
in the respective Policy) or (iv) the participant, unless the termination
follows an announcement by NorAm regarding a reduction in the participants' pay
or relocation of the participants' place of employment by more than 50 miles.
Under the Special Policy (covering 72 NorAm employees), the severance cash
amount is equal to the greater of (a) 1.5 or 2.0 (depending on the factor
assigned to the particular employee) multiplied by annual "Compensation"
(defined as base pay plus variable pay based on the maximum level of performance
at time of termination or change in control, whichever is greater) or (b) three
weeks of Compensation multiplied by the participant's years of service, but not
less than six months of Compensation. Under the General Policy (covering all
employees who are not covered by the Special Policy or an individual severance
agreement), the severance cash amount is three weeks of Compensation multiplied
by years of service, but not less than six months of Compensation. In addition,
under both Policies, an eligible participant is entitled (upon a qualifying
termination of employment) to (i) a lump-sum payment equal to the COBRA premium
for medical and dental coverage for the lesser of 18 months or the number of
months taken into account in the cash severance formula, (ii) appropriate
outplacement services and (iii) if participant has reached age 45 and completed
five years of service but has not attained age 55, treatment as a retiree for
pension and retiree medical purposes, with benefits to commence at age 55 or
termination of service, if later. The Special Policy also contains a "gross-up"
payment if any compensation to the executive is subject to tax under Section
4999 of the Code as an "excess parachute payment."
    
 
     Pursuant to the Merger Agreement, Houston has agreed to honor the General
Policy, the Special Policy, 15 individual executive severance agreements (see
"-- Interests of Certain Persons in the Transaction -- Executive Severance
Agreements and Other Arrangements"), certain NorAm employee benefit plans,
programs, policies, arrangements and agreements and certain NorAm incentive
compensation plans (the "Listed Plans") and will not adversely affect the
benefits accrued thereunder at the Effective Time (or, solely with respect to
the 15 severance agreements and the Policies accrued at termination of
employment after the Effective Time).
 
     For one year after the Effective Time, the Merger Agreement generally
obligates Houston to continue without adverse change all NorAm employee benefit
plans other than the Listed Plans and the incentive and/or variable plans
described below, except that any NorAm Common Stock investment fund offered
under a NorAm employee benefit plan will be replaced by either a Houston Common
Stock fund or a traditional investment fund, as determined by Houston.
Thereafter, Houston will provide the employees of NorAm and each NorAm Affiliate
(as defined in the Merger Agreement) with benefits that in the aggregate are not
less favorable than those then provided to similarly situated employees of
Houston. In the event a Houston employee benefit plan is made available to
employees of NorAm and the NorAm Affiliates, all periods of service with NorAm
and the NorAm Affiliates will be credited to such employees for all purposes
other than accrual of benefits.
 
     If the Effective Time does not occur by December 31, 1996, awards made by
NorAm under the NorAm 1994 Incentive Equity Plan (the "NorAm Incentive Plan")
for the performance cycle beginning January 1, 1997 (the "Cycle X Awards") will
be made by utilizing the same salary grade levels and corresponding award levels
that were utilized in making awards for the performance cycle beginning January
1, 1996. Each Cycle X Award shall be conditioned upon (1) the recipient's waiver
of the acceleration of incentive benefits provided
 
                                       50
<PAGE>   58
 
for in any severance agreement with respect to any outstanding Cycle X Awards,
(2) the recipient's agreement that (a) if the recipient becomes employed by
Houston or an affiliate of Houston at the Effective Time, each outstanding Cycle
X Award shall automatically expire, without consideration other than the grant
of substitute awards by Houston as described below, and (b) if the recipient
does not become employed by Houston or an affiliate of Houston at the Effective
Time, (i) a fraction of the options subject to each outstanding Cycle X Award
shall become immediately exercisable (and the option shall expire with respect
to the remaining shares) and (ii) a fraction of all nonforfeited shares of
restricted stock and opportunity shares subject to such award shall be
immediately delivered to the recipient (and the remaining restricted shares and
opportunity shares shall be forfeited), and that for purposes of determining the
number of such option shares that accelerate and the number of restricted shares
and opportunity shares that transfer, the related performance goals will be
deemed to have been achieved at the opportunity (maximum) level and the fraction
will reflect the number of days that have elapsed in the applicable performance
cycle, and (3) the recipient's agreement that the foregoing arrangement does not
constitute a reduction in the recipient's pay or benefits that would trigger a
right to voluntarily terminate employment and receive severance benefits.
 
     As of the Effective Time, Houston shall cause substitute award(s) to be
granted under the HI 1994 Long Term Incentive Compensation Plan to each
individual whose award(s) under the NorAm Incentive Plan expired upon the
individual's employment with Houston on terms and conditions substantially equal
to the terms and conditions of the expired award. With respect to each
performance cycle commencing after the Effective Time, all employees of NorAm
and the NorAm Affiliates will be eligible to participate in all incentive
compensation plans or variable pay plans maintained by Houston on substantially
the same basis as similarly situated employees of Houston and the affiliates of
Houston. The Compensation Committee or Benefits Committee of Houston, as
applicable, shall have the sole and absolute authority to determine the NorAm
employees eligible to receive, and the amount of, the awards described in this
paragraph, whose good faith determination shall be conclusive and binding on all
parties, including any employee who was employed by NorAm prior to the Effective
Time.
 
   
     For the calendar year ending December 31, 1996, NorAm will pay to each
employee of NorAm and the NorAm Affiliates who is a participant in a NorAm
annual incentive compensation plan or a variable pay program the amount of
annual incentive compensation or variable pay awarded to such employee for 1996
based on the level of performance goals actually attained by NorAm. The amount
of such pay will be determined in accordance with normal practice, will not be
prorated if the Effective Time is prior to December 31, 1996, and will be paid
on or before March 15, 1997. If the Effective Time occurs in 1997, annual
incentive compensation and variable pay awarded to employees of NorAm and the
NorAm Affiliates for calendar year 1997 will be paid as soon as practicable
after the Effective Time based on the level of performance goals NorAm actually
attained at the Effective Time (if such performance level can reasonably be
determined) or (if such performance level cannot reasonably be determined) based
on the target level of performance and will be prorated by multiplying the
amount of incentive compensation so determined by a fraction, the numerator of
which is the number of calendar days from and including January 1, 1997 through
the date of the Effective Time and the denominator of which is 365.
    
 
     For a period of at least two years after the Effective Time, Houston will
maintain and continue initiatives similar to those reflected in NorAm's
Operation Breakthrough, a program addressing NorAm's corporate culture, and will
consider extending or integrating such initiatives into Houston and the
affiliates of Houston in order to more fully integrate the businesses,
operations and employees of Houston and NorAm.
 
     NorAm has previously established two "rabbi trusts" with Boatman's Trust
Company, as trustee (the "NorAm Rabbi Trusts"), to fund certain nonqualified
benefit plans, programs and compensation agreements for employees and directors.
Pursuant to resolutions adopted by the NorAm Board of Directors at the time the
NorAm Rabbi Trusts were established, the execution of the Merger Agreement by
NorAm would have caused the NorAm Rabbi Trusts to be funded. Pursuant to the
Merger Agreement, NorAm has agreed to take such action as is necessary to
rescind such funding resolutions. In exchange, Houston agreed to maintain the
NorAm Rabbi Trusts for an indefinite period of time and to terminate the NorAm
Rabbi Trusts only with the unanimous consent of those persons who would benefit
from the NorAm Rabbi Trusts if the NorAm Rabbi Trusts were fully funded. In
addition, Houston agreed to deliver to the trustee of the NorAm Rabbi Trusts, on
 
                                       51
<PAGE>   59
 
or before the occurrence of a change in control of Houston (a change in control
to have the same meaning as under the NorAm Rabbi Trusts as if the term
"Company" referred to Houston), an amount that is not less than 120% multiplied
by the aggregate "Fully Funded" amounts for all "subaccounts" as most recently
determined by the "Actuary" (as such terms are defined in the NorAm Rabbi
Trusts), unless those persons who would benefit from the funding of the NorAm
Rabbi Trusts unanimously waive such funding.
 
INTERESTS OF CERTAIN PERSONS IN THE TRANSACTION
 
     In considering the recommendation of the NorAm Board of Directors with
respect to the Transaction, stockholders should be aware that certain members of
the Board of Directors of NorAm and certain executive officers of NorAm have the
following interests in the Transaction separate from their interests as NorAm
stockholders.
 
     COMPOSITION OF THE HOUSTON BOARD. In connection with the Transaction, T.
Milton Honea, Robert C. Hanna, O. Holcombe Crosswell and Joseph M. Grant, who
are currently directors of NorAm, will be elected as directors of Houston
effective as of the Effective Time. See "Relationship of the
Parties -- Following the Transaction -- Board of Directors of Houston."
 
   
     CERTAIN BENEFITS OF NON-EMPLOYEE DIRECTORS. As a result of the Transaction,
each non-employee Director of NorAm who has completed five or more years of
service as a non-employee Director will retire from such service and become
entitled, under the NorAm Directors' Retirement Plan, to receive an annual
retirement benefit equal to the annual cash fee paid to the Director for
services to NorAm as in effect at the time of the Director's retirement. The
retirement benefit will begin on the first day of the month following the later
of the Director's retirement or attainment of age 65, and will be paid annually
to the Director for a number of years equal to the Director's full years of
service, not to exceed ten years. In addition, under the NorAm 1994 Restricted
Stock Plan for Non-Employee Directors, all non-forfeited shares granted to any
non-employee Director under the plan in a year prior to the year of the
Transaction, and a portion of the non-forfeited shares granted to any
non-employee Director in the year of the Transaction (prorated to reflect the
period of the Director's service in the year of the Transaction), shall become
fully vested and non-forfeitable upon the Effective Time. The aggregate number
of shares of restricted stock of the non-employee Directors of NorAm which will
be fully vested and non-forfeitable upon the Effective Time are as follows: Joe
E. Chenoweth -- 3,627; O. Holcombe Crosswell -- 3,627; Walter A.
DeRoeck -- 3,627; Mickey P. Foret -- 2,716; Joseph M. Grant -- 2,716; Robert C.
Hanna -- 3,627; Jeffrey W. Hart -- 2,716; Weldon H. Johnson -- 676; Myra
Jones -- 3,627; and Bruce W. Wilkinson -- 1,127.
    
 
   
     EFFECT OF CHANGE IN CONTROL. The Transaction will constitute a "change in
control" for compensation and benefit plans that contain a provision relating to
a change in control of NorAm. The NorAm Incentive Plan provides that all
outstanding options will become immediately exercisable in full in the event of
a change in control of NorAm and the restrictions on the restricted shares will
lapse (other than restrictions required by securities laws) and all opportunity
shares granted for the performance cycle will be issued to the employee
("Acceleration of Benefits"). The aggregate number of shares of NorAm Common
Stock that are covered by options which will be so accelerated and the aggregate
number of shares of restricted stock (including opportunity shares) in the NorAm
Incentive Plan which will be without restrictions held by the following
executive officers of NorAm are as follows: T. Milton Honea -- 151,369
(including 6,667 option shares pursuant to his compensation arrangement) and
159,313 (including 31,112 shares pursuant to his compensation arrangement);
Charles M. Oglesby -- 80,717 (including 16,667 option shares pursuant to his
compensation arrangement) and 73,450 (including 25,000 shares pursuant to his
compensation arrangement); Michael B. Bracy -- 71,334 and 55,301; William A.
Kellstrom -- 40,667 and 30,300; Hubert Gentry, Jr. -- 32,601 and 24,575; Rollie
G. Bohall -- 24,476 and 17,433; Michael A. Creel -- 12,734 and 9,900; Dale C.
Earwood -- 17,301 and 13,001; William C. Elias -- 53,802 and 24,430; Jack W.
Ellis -- 11,334 and 8,801; Robert N. Jones -- 32,512 and 23,625; William H.
Kelly -- 26,901 and 21,050; Michael H. Means -- 32,601 and 24,575; Gary N.
Peterson -- 32,601 and 24,575; Rick L. Spurlock -- 26,334 and 20,250.
    
 
     The exercise prices of the stock options reflected above range from $5.25
to $8.625.
 
                                       52
<PAGE>   60
 
   
     During an election period commencing on the date HL&P publicly announces
the date on which the Transaction will close and ending at 5:00 p.m. on the
business day immediately prior to the Closing Date, each holder of an unexpired
employee stock option to purchase NorAm Common Stock (including each of the
named executives) shall be entitled to elect to either (i) have all or any
portion of his or her stock options canceled and "cashed out" or (ii) have all
or any portion of his or her stock options assumed by Houston. See "The
Transaction -- Merger Consideration -- NorAm Employee Stock Options."
    
 
     EXECUTIVE SEVERANCE AGREEMENTS AND OTHER ARRANGEMENTS.  On July 10, 1996,
NorAm authorized severance agreements with 15 executive officers and other key
executives of NorAm, including the following executive officers of NorAm: T.
Milton Honea, Charles M. Oglesby, Michael B. Bracy, William A. Kellstrom, Hubert
Gentry, Jr., Rollie G. Bohall, Michael A. Creel, Jack W. Ellis, Robert N. Jones,
William H. Kelly, Michael H. Means, Gary N. Peterson and Rick L. Spurlock.
Messrs. Honea and Bracy are also directors of NorAm.
 
     The severance agreements provide that on the date of the last regulatory
approval of a change in control, the Acceleration of Benefits will occur and
further provide for the payment of certain benefits to the executive if a
so-called "double trigger" exists, that is, that a change in control has
occurred and, within three years following a change in control, the executive's
employment is terminated, except in the case of termination by (i) death, (ii)
permanent disability, (iii) NorAm or its successor company for cause (as defined
in the agreements) or (iv) the executive for any reason other than those
expressly set forth in the severance agreement (generally including an adverse
change in the executive's status, authority or position; a reduction in the
executive's aggregate pay or benefits; failure by a successor company to assume
the obligations under the severance agreement; relocation of NorAm's principal
executive offices or the executive's principal location of work by more than 25
miles; or the requirement that the executive travel away from his office 20%
more than was required of the executive in any of the three full years
immediately prior to the change in control).
 
     The benefits payable by NorAm or its successor under each severance
agreement in the event of a qualifying termination following a change of control
include (i) a lump-sum cash amount equal to 2.99 (2.00 in the case of two
executives) multiplied by the sum of (a) the executive's base salary (the
highest rate in effect for any period prior to the termination date) plus (b)
the annual bonus that would have been paid for the year in which the change in
control occurred if the performance goals had been achieved at the maximum
level, (ii) outplacement services, (iii) welfare benefits for a period of 36
months following termination of employment substantially similar to the benefits
previously applicable to the executive, (iv) 36 months of additional service
credit, treatment of the lump-sum severance payment as wages, and three
additional years of deemed age for purposes of benefit accrual and eligibility
for benefits under all benefit plans applicable to the executive, and (v)
retiree welfare benefits for the executive's lifetime.
 
     The severance agreements provide for a "gross-up" payment if the executive
is subject to excise taxes under Section 4999 of the Code (which relates to
excess parachute payments under Section 280G of the Code). In addition, the
severance agreements provide for the payment of accounting expenses related to
any tax or severance agreement benefits for the executive and payment of legal
fees incurred by the executive, if needed, to enforce his rights under the
agreement. Performance of NorAm's obligation to pay legal fees under the
severance agreements will be secured by a trust previously established by NorAm.
 
     INDEMNIFICATION.  From and after the Effective Time, the surviving
corporation of the merger involving NorAm (the "NorAm Surviving Corporation")
will indemnify, defend and hold harmless each person who is at the date of the
Merger Agreement, or has been at any time prior to the date of the Merger
Agreement or who becomes prior to the Effective Time, an officer or director of
NorAm or any of its subsidiaries or an employee of NorAm or any of its
subsidiaries who acts as a fiduciary under any NorAm Benefit Plan (as defined in
the Merger Agreement) or NorAm Pension Benefit Plan (as defined in the Merger
Agreement) (the "Indemnified Parties") against all losses, claims, damages,
costs, expenses (including attorneys' fees), liabilities or judgments or amounts
that are paid in settlement with the approval of the indemnifying party (which
approval shall not be unreasonably withheld) of or in connection with any
threatened or actual claim, action, suit, proceeding or investigation based in
whole or in part on or arising in whole or in part out of the
 
                                       53
<PAGE>   61
 
fact that such person is or was a director, officer or such employee of NorAm or
any of its subsidiaries whether pertaining to any matter existing or occurring
at or prior to the Effective Time and whether asserted or claimed prior to, or
at or after, the Effective Time ("Indemnified Liabilities"), including all
Indemnified Liabilities based in whole or in part on, or arising in whole or in
part out of, or pertaining to the Merger Agreement or the transactions
contemplated thereby, in each case to the full extent permitted under applicable
law (and the NorAm Surviving Corporation will pay expenses in advance of the
final disposition of any such action or proceeding to each Indemnified Party to
the full extent permitted by law). The NorAm Surviving Corporation will not have
any obligation under the Merger Agreement to any Indemnified Party when and if a
court of competent jurisdiction ultimately determines, and such determination
shall have become final, that the indemnification of such Indemnified Party in
the manner contemplated by the Merger Agreement is prohibited by applicable law.
NorAm, HI, HL&P and Merger Sub have agreed that all rights to indemnification,
including provisions relating to advances of expenses incurred in defense of any
action or suit, existing in favor of the Indemnified Parties with respect to
matters occurring through the Effective Time, will survive the Transaction and
will continue in full force and effect for a period of six years from the
Effective Time; provided, however, that all rights to indemnification in respect
of any Indemnified Liabilities asserted or made within such period will continue
until the disposition of such Indemnified Liabilities.
 
     Pursuant to the Merger Agreement, the NorAm Surviving Corporation is
obligated to maintain certain directors' and officers' liability insurance for a
period of six years after the Effective Time.
 
AMENDMENT OF ARTICLES OF INCORPORATION
 
   
     Pursuant to the Merger Agreement and in connection with the Transaction
(other than in connection with the Second Alternative Merger), the Restated
Articles of Incorporation of HL&P will be amended to, among other things, (i)
change the name of HL&P to "Houston Industries Incorporated," (ii) change the
authorized capital stock from 20,001,100 shares to 720,000,000 shares and (iii)
change the terms of the common stock. See "Description of Houston Capital
Stock -- Common Stock." The change in authorized shares results from the
elimination of Class A (1,000 shares) and Class B (100 shares) common stock of
HL&P and the creation of a new, single class of Houston Common Stock
(700,000,000 shares). A copy of the proposed Amendment to HL&P's Restated
Articles of Incorporation is attached as Exhibit A to the Merger Agreement,
which is attached hereto as Appendix A, and is incorporated by reference herein.
    
 
DISSENTERS' APPRAISAL RIGHTS
 
     Record holders of HI Common Stock are not entitled to appraisal rights
under Article 5.11 of the Texas Business Corporation Act (the "TBCA").
 
     Record holders of NorAm Common Stock are entitled to appraisal rights under
Section 262 of the Delaware General Corporation Law (the "DGCL"). A holder of
NorAm Stock Options or NorAm Convertible Debentures must exercise such options
or convert such debentures in order to obtain NorAm Common Stock before such
holder will be entitled to appraisal rights as a stockholder of NorAm. A holder
of NorAm Stock Options or NorAm Convertible Debentures is not otherwise entitled
to appraisal rights.
 
   
     THIS DISCUSSION IS NOT A COMPLETE STATEMENT OF THE LAW PERTAINING TO
APPRAISAL RIGHTS UNDER THE DGCL AND IS QUALIFIED IN ITS ENTIRETY BY THE FULL
TEXT OF SECTION 262, WHICH IS REPRINTED IN ITS ENTIRETY AS APPENDIX D TO THIS
JOINT PROXY STATEMENT/PROSPECTUS. ALL REFERENCES IN SECTION 262 AND IN THIS
SUMMARY TO A "STOCKHOLDER" OR "HOLDER" ARE TO THE RECORD HOLDER OF THE SHARES OF
NORAM COMMON STOCK AS TO WHICH APPRAISAL RIGHTS ARE ASSERTED.
    
 
   
     Under the DGCL, record holders of NorAm Common Stock who follow the
procedures set forth in Section 262 and who do not vote in favor of the Merger
Agreement will be entitled to have their shares of NorAm Common Stock appraised
by the Delaware Court of Chancery and to receive payment of the "fair value" of
such shares, exclusive of any element of value arising from the accomplishment
or expectation of the Transaction, together with a fair rate of interest, if
any, as determined by such court. Such holders are, in such circumstances,
entitled to appraisal rights because they hold stock of constituent corporations
to the Transaction, and may be required by the Merger Agreement to accept Merger
Consideration in the form of
    
 
                                       54
<PAGE>   62
 
   
Cash Consideration or Stock Consideration. A PERSON HAVING A BENEFICIAL INTEREST
IN SHARES OF NORAM COMMON STOCK HELD OF RECORD IN THE NAME OF ANOTHER PERSON,
SUCH AS A BROKER OR NOMINEE, MUST ACT PROMPTLY TO CAUSE THE RECORD HOLDER TO
FOLLOW THE STEPS SUMMARIZED BELOW PROPERLY AND IN A TIMELY MANNER TO PERFECT THE
APPRAISAL RIGHTS PROVIDED UNDER SECTION 262.
    
 
   
     Under Section 262, where a proposed merger is to be submitted for approval
at a meeting of stockholders, as in the case of the NorAm Special Meeting, not
less than 20 days prior to the meeting, the corporation must notify each of its
stockholders who was such on the record date for such meeting with respect to
shares for which appraisal rights are available that appraisal rights are
available and include in each such notice a copy of Section 262.
    
 
   
     This Joint Proxy Statement/Prospectus constitutes such notice to the record
holders of NorAm Common Stock and the applicable provisions of the DGCL are
attached to this Joint Proxy Statement/Prospectus as Appendix D. Any such
stockholder who wishes to exercise such appraisal rights should review the
following discussion and Appendix D carefully, because failure to timely and
properly comply with the procedures specified will result in the loss of
appraisal rights under the DGCL.
    
 
   
     A holder of shares of NorAm Common Stock wishing to exercise his or her
appraisal rights (a) must deliver to the Secretary of NorAm, before the vote on
the Merger Agreement at the NorAm Special Meeting to be held on December 11,
1996, a written demand for appraisal of his or her shares of NorAm Common Stock
and (b) must not vote in favor of the Transaction. A proxy or vote against the
Transaction shall not constitute a demand. In addition, mere failure, after the
completion of the NorAm Merger, to execute and return a letter of transmittal to
the Exchange Agent does not constitute a demand. A holder of NorAm Common Stock
electing to demand appraisal must do so before the taking of a vote on the
Merger Agreement by a separate written demand that reasonably informs NorAm of
the identity of the holder of NorAm Common Stock of record and of such holder's
intention thereby to demand the appraisal of such holder's NorAm Common Stock.
ALL WRITTEN DEMANDS FOR APPRAISAL SHOULD BE SENT OR DELIVERED TO NORAM AT 1600
SMITH STREET, HOUSTON, TEXAS 77002, ATTENTION: SECRETARY.
    
 
   
     A holder of shares of NorAm Common Stock wishing to exercise his or her
appraisal rights must hold his or her shares of record on the date the written
demand for appraisal is made and must hold his or her shares continuously
through the Effective Time. Accordingly, a record holder of NorAm Common Stock
who is the record holder of NorAm Common Stock on the date the written demand
for appraisal is made, but who thereafter transfers such stock prior to the
consummation of the NorAm Merger, will lose any right to appraisal in respect of
such shares.
    
 
   
     Only a holder of record of shares of NorAm Common Stock is entitled to
assert appraisal rights for the shares of NorAm Common Stock registered in that
holder's name. A demand for appraisal should be executed by or on behalf of the
holder of record, fully and correctly, as such holder's name appears on such
holder's stock certificates. If the shares of NorAm Common Stock are owned of
record in a fiduciary capacity, such as by a trustee, guardian or custodian,
execution of the demand should be made in that capacity, and if the shares of
NorAm Common Stock are owned of record by more than one person as in a joint
tenancy or tenancy in common, the demand should be executed by or on behalf of
all joint owners. An authorized agent, including one or more joint owners, may
execute a demand for appraisal on behalf of a holder of record; however, the
agent must identify the record owner or owners and expressly disclose the fact
that, in executing the demand, the agent is agent for such owner or owners. A
record holder such as a broker who holds shares of NorAm Common Stock as nominee
for several beneficial owners may exercise appraisal rights with respect to the
shares of NorAm Common Stock held for one or more beneficial owners while not
exercising such rights with respect to the shares of NorAm Common Stock held for
other beneficial owners; in such case, the written demand should set forth the
number of shares of NorAm Common Stock as to which appraisal is sought. When no
number of shares of NorAm Common Stock is expressly mentioned the demand will be
presumed to cover all shares of NorAm Common Stock held in the name of the
record owner.
    
 
     Stockholders who hold their shares of NorAm Common Stock in brokerage
accounts or other nominee forms and who wish to exercise appraisal rights must
take all necessary steps in order that a demand for
 
                                       55
<PAGE>   63
 
appraisal is made by the record holder of those shares and are urged to consult
with their brokers to determine the appropriate procedures for the making of a
demand for appraisal by the record holder.
 
   
     Within ten days after the Effective Time, the NorAm Surviving Corporation
must send a notice as to the effectiveness of the appropriate merger to each
person who has properly asserted appraisal rights under Section 262 and has not
voted in favor of or consented to the Transaction. Within 120 days after the
Effective Time, but not thereafter, the NorAm Surviving Corporation, or any
holder of shares of NorAm Common Stock who has complied with the procedures
under Section 262 and who is entitled to appraisal rights under Section 262, may
file a petition in the Delaware Court of Chancery demanding a determination of
the value of the stock of all such stockholders. The NorAm Surviving Corporation
is not under any obligation, and Merger Sub has no present intention, to file a
petition with respect to the appraisal of the "fair value" of the shares of
NorAm Common Stock. Accordingly, it is the obligation of the stockholders to
initiate all necessary action to perfect their appraisal rights within the time
prescribed in Section 262.
    
 
   
     Within 120 days after the Effective Time, any stockholder who has complied
with the requirements for exercise of appraisal rights will be entitled, upon
written request, to receive from the NorAm Surviving Corporation a statement
setting forth the aggregate number of shares of NorAm Common Stock not voted in
favor of adoption of the Merger Agreement and with respect to which demands for
appraisal have been received and the aggregate number of holders of such shares
of NorAm Common Stock. Such statements must be mailed within 10 days after a
written request therefor has been received by the NorAm Surviving Corporation or
within 10 days after expiration of the period for delivery of demands for
appraisal under Section 262, whichever is later.
    
 
   
     A holder of shares of NorAm Common Stock will fail to perfect, or
effectively lose, his or her right to appraisal if, among other things, no
petition for appraisal of shares of NorAm Common Stock is filed within 120 days
after the Effective Time, or if the stockholder delivers to NorAm a written
withdrawal of his or her demand for appraisal. If a petition for an appraisal is
timely filed, after a hearing on such petition, the Delaware Court of Chancery
will determine the stockholders entitled to appraisal rights and will appraise
the "fair value" of their shares of NorAm Common Stock, exclusive of any element
of value arising from the accomplishment or expectation of the NorAm Merger,
together with a fair rate of interest, if any, to be paid upon the amount
determined to be the fair value. Stockholders considering seeking appraisal
should be aware that the fair value of their shares of NorAm Common Stock as
determined under Section 262 could be more than, the same as or less than the
value of the consideration they would receive pursuant to the Merger Agreement
if they did not seek appraisal of their shares of NorAm Common Stock and that
investment banking opinions as to fairness from a financial point of view are
not necessarily opinions as to fair value under Section 262. The Delaware
Supreme Court has stated that "proof of value by any techniques or methods which
are generally considered acceptable in the financial community and otherwise
admissible in court" should be considered in the appraisal proceedings.
    
 
   
     The Delaware Court of Chancery will determine the amount of interest, if
any, to be paid upon the amounts to be received by persons whose shares of NorAm
Common Stock have been appraised. The costs of the action may be determined by
the Delaware Court of Chancery and taxed upon the parties as the Delaware Court
of Chancery deems equitable. The Delaware Court of Chancery may also order that
all or a portion of the expenses incurred by any stockholder in connection with
the appraisal proceeding, including, without limitation, reasonable attorneys'
fees and the fees and expenses of experts utilized in the appraisal proceeding,
be charged pro rata against the value of all of the shares of NorAm Common Stock
entitled to appraisal.
    
 
     If any holder of shares of NorAm Common Stock who demands appraisal of his
shares under Section 262 fails to perfect, or effectively withdraws or loses,
his right to appraisal, as provided in the DGCL, the shares of NorAm Common
Stock of such stockholder will be deemed to be Non-Election Shares in accordance
with the Merger Agreement. See "-- Election Procedure." A holder may withdraw
his demand for appraisal by delivering to the NorAm Surviving Corporation a
written withdrawal of his demand for appraisal and acceptance of the
Transaction, except that any such attempt to withdraw made more than 60 days
after the Effective Time will require the written approval of the NorAm
Surviving Corporation. Failure to follow the steps required by Section 262 of
the DGCL for perfecting appraisal rights may result in the loss of such rights
 
                                       56
<PAGE>   64
 
   
(in which event a stockholder will be entitled to receive the consideration
receivable with respect to such appraisal shares in accordance with the Merger
Agreement).
    
 
     Any holder of shares of NorAm Common Stock who has duly demanded an
appraisal in compliance with Section 262 will not, after the Effective Time, be
entitled to vote the shares of NorAm Common Stock subject to such demand for any
purpose or be entitled to the payment of dividends or other distributions on
those shares (except dividends or other distributions payable to holders of
record of shares of NorAm Common Stock as of a date prior to the Effective
Time). Pursuant to the Merger Agreement, NorAm shall not, except with the prior
written consent of HI, voluntarily make any payment with respect to any demands
for appraisals of NorAm Common Stock, offer to settle or settle any such demands
or approve any withdrawal of any such demands.
 
NYSE LISTING OF COMMON STOCK
 
     It is a condition to the Transaction that the shares of Houston Common
Stock to be issued in the Transaction be authorized for listing on the NYSE,
subject to official notice of issuance. HI Common Stock is traded on the NYSE,
the Chicago Stock Exchange and the London Stock Exchange under the symbol "HOU."
 
RESALES OF HOUSTON COMMON STOCK
 
     The shares of Houston Common Stock to be issued to the stockholders of HI
and NorAm pursuant to the Merger Agreement are being registered under the
Securities Act pursuant to the Registration Statement of which this Joint Proxy
Statement/Prospectus is a part. However, because some stockholders of HI or
NorAm are or may be affiliates of HI or NorAm and may be deemed to be affiliates
of Houston, such persons will not be able to resell the Houston Common Stock
received by them in the Transaction unless the Houston Common Stock is
registered for resale under the Securities Act, is sold in compliance with an
exemption from the registration requirements of the Securities Act or is sold in
compliance with Rule 145 under the Securities Act.
 
     Pursuant to Rule 145 under the Securities Act, the sale of Houston Common
Stock acquired by such former HI and NorAm stockholders pursuant to the
Transaction will be subject to certain restrictions. Such persons may sell
Houston Common Stock under Rule 145 only if (i) Houston has filed all reports
required to be filed by Section 13 or 15(d) of the Exchange Act during the
preceding 12 months, (ii) the Houston Common Stock is sold in a "broker's
transaction," which is defined in Rule 144 under the Securities Act as a sale in
which (a) the seller does not solicit or arrange for orders to buy the
securities, (b) the seller does not make any payment other than to the broker,
(c) the broker does no more than execute the order and receive a nominal
commission and (d) the broker does not solicit customer orders to buy the
securities, and (iii) such sale and all other sales made by such person within
the preceding three months do not collectively exceed the greater of (x) 1% of
the outstanding shares of Houston Common Stock and (y) the average weekly
trading volume of Houston Common Stock on all national securities exchanges
during the four-week period preceding the sale.
 
     Persons who may be deemed to be affiliates of HI or NorAm generally include
individuals or entities which control, are controlled by, or are under common
control with, HI or NorAm, as the case may be, and may include certain officers
and directors of HI or NorAm, as well as principal stockholders of HI or NorAm,
as the case may be. The Merger Agreement requires NorAm to use its best efforts
to cause each of its affiliates to execute a written agreement to the effect
that the affiliate will not offer or sell or otherwise dispose of any shares of
Houston Common Stock issued to the affiliate in or pursuant to the Transaction
in violation of the Securities Act or the rules and regulations promulgated by
the SEC thereunder.
 
LITIGATION
 
     On August 14, 1996, an action styled Shaw v. NorAm Energy Corp., et al. was
filed in the District Court of Harris County, Texas by a purported NorAm
stockholder against NorAm, certain of its officers and directors and HI to
enjoin the Transaction or to rescind the Transaction and/or to recover damages
in the
 
                                       57
<PAGE>   65
 
event that the Transaction is consummated. The complaint alleges, among other
things, that the Merger Consideration is inadequate, that NorAm's Board of
Directors breached its fiduciary duties and that HI aided and abetted such
breaches of fiduciary duties. The complaint additionally alleges that the NorAm
directors' agreement to the terms of the Transaction and its timing, and their
alleged failure to auction NorAm, and to invite other bidders and provide a
market check, demonstrate an absence of the exercise of due care and of loyalty
to NorAm's public stockholders. In addition, the plaintiff seeks certification
as a class action. NorAm, the NorAm directors and HI believe that the claims
against them are without merit and intend to vigorously defend against the
lawsuit.
 
                           CERTAIN REGULATORY MATTERS
 
     Set forth below is a summary of the regulatory requirements affecting the
Transaction. Failure to obtain any necessary regulatory approval or any adverse
conditions that are imposed with respect to any necessary regulatory approval
may affect the consummation of the Transaction.
 
ANTITRUST CONSIDERATIONS
 
   
     The HSR Act and the rules and regulations thereunder provide that certain
transactions (including the Transaction) may not be consummated until certain
information has been submitted to the Antitrust Division of the Department of
Justice (the "Antitrust Division") and the Federal Trade Commission (the "FTC")
and the specified HSR Act waiting period requirements have been satisfied. HI
and NorAm submitted respective Premerger Notifications pursuant to the HSR Act
on August 23 and 26, 1996, respectively. On September 20, 1996, the Antitrust
Division made a request for additional information ("second request") to HI and
NorAm. This had the effect of suspending the waiting period until both parties
substantially complied with the second request at which point the waiting period
would run for an additional 20 days. The parties submitted documents and
information in response to the second request on October 11, 1996, and believe
that they substantially complied with the second request as of that date. The
expiration or earlier termination of the HSR Act waiting period would not
preclude the Antitrust Division or the FTC from challenging the Transaction on
antitrust grounds. Neither HI nor NorAm believes that the Transaction will
violate federal antitrust laws. If the Transaction is not consummated within 12
months after the expiration or earlier termination of the initial HSR Act
waiting period, HI and NorAm must submit new information to the Antitrust
Division and the FTC, and a new HSR Act waiting period must expire or be earlier
terminated before the Transaction can be consummated.
    
 
PUBLIC UTILITY HOLDING COMPANY ACT OF 1935
 
   
     HI is a "public utility holding company" as defined in the 1935 Act and is
exempt from regulation as a registered public utility holding company under the
1935 Act except with respect to the acquisition of voting securities of other
domestic "public utility companies" and utility holding companies. HL&P and
NorAm are both public utility companies as defined in the 1935 Act. HI has filed
an application with the SEC requesting an order granting Houston an exemption
from regulation as a registered public utility holding company under section
3(a)(2) of the 1935 Act. Section 3(a)(2) of the 1935 Act provides that the SEC
shall exempt any public utility holding company, and each subsidiary thereof,
from the provisions of the 1935 Act (unless the SEC finds the exemption
detrimental to the public interest or the interest of investors or consumers),
if the public utility holding company is predominantly a public utility company
whose operations as such do not extend beyond the state in which it is organized
and states contiguous thereto. If the order is not granted and HL&P, after
consultation with its legal counsel, determines that upon consummation of the
Transaction, Houston would not be an exempt public utility holding company under
section 3(a)(2) of the 1935 Act, the Merger Agreement provides that the parties
will effect the First Alternative Merger in lieu of the Basic Mergers. In the
First Alternative Merger, HI and NorAm would both merge into HL&P. In that
event, no SEC approval would be required.
    
 
                                       58
<PAGE>   66
 
ATOMIC ENERGY ACT OF 1954
 
   
     HL&P holds an operating license from the Nuclear Regulatory Commission (the
"NRC") in connection with its role as project manager of the South Texas Project
Electric Generating Station. HL&P has requested confirmation from the NRC that,
other than an administrative license amendment to reflect that HL&P's name will
change in the Transaction, no NRC action is required.
    
 
STATE REGULATORY MATTERS
 
   
     NorAm's natural gas distribution operations are regulated as public
utilities in Arkansas, Louisiana, Minnesota, Mississippi, Oklahoma and Texas.
Statutes and/or regulations in Arkansas, Louisiana, Minnesota, Mississippi and
Oklahoma require HI and NorAm to obtain prior approval of the Transaction from
utility regulatory commissions in those states. The required filings have been
made in each state. HI and NorAm's filings will be reviewed under standards
generally requiring a determination that the Transaction is consistent with the
public interest.
    
 
OTHER REGULATORY MATTERS
 
   
     The power marketing operations of NES are conducted pursuant to power
marketing authorization granted by the FERC. NorAm and HI have filed notice of a
change in the status of NES to reflect its post-merger affiliation with Houston
and for confirmation that NES may continue power marketing activities at
market-based rates following the Transaction.
    
 
   
     NorAm possesses municipal franchises that require the consent of the
municipality to the Transaction. The required applications have been filed in
the four municipalities where approval is required.
    
 
   
     The parties to the Merger Agreement have agreed to cooperate and use their
best efforts to promptly prepare and file all necessary documentation, to effect
all necessary applications, notices, petitions, filings and other documents, and
to use all commercially reasonable efforts to obtain (and will cooperate with
each other in obtaining) any consent, authorization, order or approval of, or
any exemption or nonopposition by, any Governmental Entity (as defined in the
Merger Agreement) required to be obtained or made by NorAm, HI, HL&P or any of
their subsidiaries in connection with the Transaction or the taking of any
action contemplated thereby or by the Merger Agreement.
    
 
                   CERTAIN PROVISIONS OF THE MERGER AGREEMENT
 
     THE FOLLOWING DESCRIPTION OF THE MERGER AGREEMENT DOES NOT PURPORT TO BE
COMPLETE AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO THE MERGER AGREEMENT,
A COPY OF WHICH IS INCLUDED AS APPENDIX A TO THIS JOINT PROXY
STATEMENT/PROSPECTUS AND IS INCORPORATED IN ITS ENTIRETY HEREIN BY REFERENCE.
 
CONDITIONS TO THE TRANSACTION
 
  CONDITIONS TO EACH PARTY'S OBLIGATION TO EFFECT THE TRANSACTION
 
     The respective obligations of each party to effect the Transaction are
subject to the satisfaction at or prior to the Closing Date of the following
conditions:
 
   
          STOCKHOLDER APPROVAL.  The Merger Agreement, the Transaction and the
     issuance of the Stock Consideration in the Transaction will have been
     approved and adopted by the affirmative vote of the holders of two-thirds
     of the outstanding shares of HI Common Stock entitled to vote thereon. The
     Merger Agreement and the Transaction will have been approved and adopted by
     the affirmative vote of the holders of a majority of the outstanding shares
     of NorAm Common Stock entitled to vote thereon.
    
 
   
          NYSE LISTING.  The shares of Houston Common Stock issuable to HI
     stockholders and NorAm stockholders pursuant to the Merger Agreement and
     such other shares of Houston Common Stock required to be reserved for
     issuance in connection with the Transaction will have been authorized for
     listing on the NYSE upon official notice of issuance.
    
 
                                       59
<PAGE>   67
 
   
          OTHER APPROVALS.  The waiting period applicable to the consummation of
     the Transaction under the HSR Act will have expired or been terminated and
     all filings required to be made prior to the Effective Time with, and all
     consents, approvals, permits and authorizations required to be obtained
     prior to the Effective Time from any Governmental Entity in connection with
     the execution and delivery of the Merger Agreement and the consummation of
     the transactions contemplated thereby by NorAm, HI, HL&P and Merger Sub
     will have been made or obtained (as the case may be), except for such
     consents, approvals, permits and authorizations the failure of which to be
     obtained would not, in the aggregate, be reasonably likely in the judgment
     of HI to result in a Material Adverse Effect (as defined in the Merger
     Agreement) on Houston (assuming the Transaction had taken place) or to
     materially adversely affect the consummation of the Transaction, and no
     such consent, approval, permit or authorization will impose terms or
     conditions that would have, or would be reasonably likely to have, in the
     judgment of HI, a Material Adverse Effect on NorAm or Houston (assuming the
     Transaction had taken place). Unless otherwise agreed to by HI, no such
     consent, approval, permit or authorization will then be subject to appeal.
    
 
   
          THE REGISTRATION STATEMENT.  The Registration Statement of which this
     Joint Proxy Statement/Prospectus forms a part will have become effective
     under the Securities Act and will not be the subject of any stop order or
     proceedings seeking a stop order.
    
 
   
          NO INJUNCTIONS OR RESTRAINTS.  No temporary restraining order,
     preliminary or permanent injunction or other order issued by any court of
     competent jurisdiction, no order of any Governmental Entity having
     jurisdiction over HL&P, HI or NorAm, and no other legal restraint or
     prohibition will be in effect (an "Injunction") preventing or making
     illegal the consummation of the Transaction; provided, however, that prior
     to any party invoking this condition, such party will have complied fully
     with its obligations to provide information and obtain such consents and
     approvals from Governmental Entities in connection with the Transaction
     and, in addition, use all commercially reasonable efforts to have any such
     decree, ruling, injunction or order vacated, except as otherwise
     contemplated by the Merger Agreement.
    
 
  ADDITIONAL CONDITIONS TO OBLIGATIONS OF HI, HL&P AND MERGER SUB
 
     The obligations of HI, HL&P and Merger Sub to effect the Transaction are
subject to the satisfaction at or prior to the Closing Date of the following
additional conditions, any or all of which may be waived in whole or in part by
HI, HL&P and Merger Sub:
 
   
          REPRESENTATIONS AND WARRANTIES.  The representations and warranties of
     NorAm set forth in the Merger Agreement will be true and correct in all
     material respects as of the date of the Merger Agreement and (except to the
     extent such representations and warranties speak as of an earlier date) as
     of the Closing Date as though made on and as of the Closing Date, except
     where the failure to be so true and correct (without giving effect to the
     individual materiality qualifications and thresholds otherwise contained in
     the Merger Agreement) could not reasonably be expected to have a Material
     Adverse Effect on NorAm or as otherwise contemplated by the Merger
     Agreement, and HI will have received a certificate signed on behalf of
     NorAm by the chief executive officer and by the chief financial officer of
     NorAm to such effect.
    
 
   
          PERFORMANCE OF OBLIGATIONS OF NORAM.  NorAm will have performed in all
     material respects all obligations required to be performed by it under the
     Merger Agreement at or prior to the Closing Date, and HI will have received
     a certificate signed on behalf of NorAm by the chief executive officer and
     by the chief financial officer of NorAm to such effect.
    
 
   
          LETTERS FROM NORAM AFFILIATES AND OTHER STOCKHOLDERS.  NorAm will
     cause to be prepared and delivered to HL&P a list identifying all persons
     who, at the time of the NorAm Special Meeting, may be deemed to be
     "affiliates" of NorAm as that term is used in paragraphs (c) and (d) of
     Rule 145 under the Securities Act (the "Affiliates"). NorAm will use its
     best efforts to cause each person who is identified as an Affiliate in such
     list to deliver to HL&P on or prior to the Effective Time, a written
     agreement that such person will not sell, pledge, transfer or otherwise
     dispose of any shares of Houston Common Stock
    
 
                                       60
<PAGE>   68
 
     issued to such Affiliate pursuant to the Transaction, except pursuant to an
     effective registration statement or in compliance with Rule 145 or an
     exemption from the registration requirements of the Securities Act.
 
   
          NUMBER OF DISSENTING SHARES.  At the Effective Time, the aggregate
     number of Dissenting Shares will not exceed 10% of the total number of
     outstanding shares of NorAm Common Stock.
    
 
   
          TAX OPINION.  HI will have received an opinion, in form and substance
     satisfactory to HI, dated the Closing Date, of Baker & Botts, L.L.P.,
     counsel to HI, to the effect that, if the Transaction is consummated in
     accordance with the terms of the Merger Agreement, each merger in the
     Transaction will be treated for federal income tax purposes as a
     reorganization within the meaning of Section 368(a) of the Code.
    
 
   
          NO MATERIAL LIMITATIONS OR RESTRAINTS.  No Injunction will be in
     effect (i) imposing any material limitation upon the ability of HI or any
     of its subsidiaries effectively to control the business or operations of
     NorAm or any of its subsidiaries or (ii) prohibiting or imposing any
     material limitation upon HI's or any of its subsidiaries' ownership or
     operation of all or any material portion of the business or assets or
     properties of HI or NorAm or any of their respective subsidiaries or
     compelling HI or NorAm or any of their respective subsidiaries to divest or
     hold separate all or any material portion of the business or assets or
     properties of HI or NorAm or any of their respective subsidiaries or
     imposing any other material limitation on any of them in the conduct of
     their businesses and no such action by any Governmental Entity seeking such
     an Injunction or an Injunction preventing or making illegal the
     consummation of the Transaction shall be pending; provided, however, that
     prior to invoking this condition, HI, HL&P and Merger Sub will have
     complied fully with their obligations to provide information and obtain
     such consents and approvals from Governmental Entities in connection with
     the Transaction and, in addition, use all commercially reasonable efforts
     to have any such decree, ruling, injunction or order vacated, except as
     otherwise contemplated by the Merger Agreement.
    
 
   
          NORAM REQUIRED CONSENTS.  The NorAm Required Consents (as defined in
     the Merger Agreement) will have been obtained, except for such NorAm
     Required Consents the failure of which to be obtained would not have a
     Material Adverse Effect on NorAm.
    
 
  ADDITIONAL CONDITIONS TO OBLIGATIONS OF NORAM
 
     The obligations of NorAm to effect the Transaction are subject to the
satisfaction at or prior to the Closing Date of the following additional
conditions, any or all of which may be waived in whole or in part by NorAm:
 
   
          REPRESENTATIONS AND WARRANTIES.  Each of the representations and
     warranties of HI, HL&P and Merger Sub set forth in the Merger Agreement
     will be true and correct in all material respects as of the date of the
     Merger Agreement and (except to the extent such representations and
     warranties speak as of an earlier date) as of the Closing Date as though
     made on and as of the Closing Date, except where the failure to be so true
     and correct (without giving effect to the individual materiality
     qualifications and thresholds otherwise contained in the Merger Agreement)
     could not reasonably be expected to have a Material Adverse Effect on HI or
     as otherwise contemplated by the Merger Agreement, and NorAm will have
     received a certificate signed on behalf of HI by the chief executive
     officer and by the chief financial officer of HI to such effect.
    
 
   
          PERFORMANCE OF OBLIGATIONS OF HI, HL&P AND MERGER SUB.  HI, HL&P and
     Merger Sub will have performed in all material respects all obligations
     required to be performed by them under the Merger Agreement at or prior to
     the Closing Date, and NorAm will have received a certificate signed on
     behalf of HI by the chief executive officer and by the chief financial
     officer of HI to such effect.
    
 
   
          TAX OPINION.  NorAm will have received an opinion, in form and
     substance satisfactory to NorAm, dated the Closing Date, of Jones, Day,
     Reavis & Pogue, counsel to NorAm, to the effect that, if the Transaction is
     consummated in accordance with the terms of the Merger Agreement, the NorAm
     Merger (or in lieu thereof, the Selected Alternative Merger) should be
     treated for federal income tax purposes as a reorganization within the
     meaning of Section 368(a) of the Code.
    
 
                                       61
<PAGE>   69
 
   
          HI REQUIRED CONSENTS.  The HI Required Consents (as defined in the
     Merger Agreement) will have been obtained, except for such HI Required
     Consents the failure of which to be obtained would not have a Material
     Adverse Effect on HI.
    
 
REPRESENTATIONS AND WARRANTIES
 
     The Merger Agreement contains various representations and warranties by
each of HI, HL&P and NorAm relating to, among other things, (i) each of their
and certain of their respective subsidiaries' organization and similar corporate
matters, (ii) each of their capital structures, (iii) the authorization,
execution, delivery, performance and enforceability of the Merger Agreement and
related matters, and the absence of conflicts, violations of or defaults under
the charters, as amended, or By-Laws, as amended, of each of HI, HL&P and NorAm,
or any loan or credit agreement, note, bond, mortgage, indenture, lease or other
agreement, instrument, permit, concession, franchise, license, judgment, order,
decree, statute, law, ordinance, rule or regulation applicable to HI, HL&P or
NorAm or any of their respective subsidiaries or any of their respective
properties or assets, (iv) the documents and reports filed by each of them with
the SEC and the accuracy of the information contained therein, (v) the accuracy
of the information provided by each of them with respect to the Registration
Statement and this Joint Proxy Statement/Prospectus, (vi) the absence of certain
events, changes or effects, (vii) the absence of undisclosed material
liabilities, (viii) compliance with certain laws, (ix) litigation, (x) taxes,
(xi) retirement and other employee plans and matters relating to the Employee
Retirement Income Security Act of 1974, as amended ("ERISA"), (xii) labor
matters, (xiii) intellectual property matters, (xiv) environmental matters, (xv)
maintenance of insurance, (xvi) contracts, (xvii) regulatory proceedings,
(xviii) regulation as a utility, (xix) fairness opinions, (xx) the stockholder
vote required to approve the Merger Agreement, (xxi) beneficial ownership of the
other party's common stock, (xxii) nonapplicability to the Merger of Article
Fifth of NorAm's Restated Certificate of Incorporation and Section 203 of the
DGCL, (xxiii) certain change of control provisions in NorAm's debt instruments
and (xxiv) broker's or similar fees.
 
CERTAIN COVENANTS -- CONDUCT OF BUSINESS OF NORAM
 
     During the period from the date of the Merger Agreement and continuing
until the Effective Time, NorAm has agreed as to itself and its subsidiaries
that (except as expressly contemplated or permitted by the Merger Agreement, or
to the extent that HI has otherwise consented in writing):
 
   
          ORDINARY COURSE.  Each of NorAm and its subsidiaries will carry on its
     businesses in the ordinary course in substantially the same manner as
     heretofore conducted and will use all reasonable efforts to preserve intact
     its present business organizations, keep available the services of its
     current officers and employees, subject to certain NorAm employee matters,
     and preserve its relationships with customers, suppliers and others having
     business dealings with it to the end that its goodwill and ongoing business
     shall not be impaired in any material respect at the Effective Time.
    
 
   
          DIVIDENDS; CHANGES IN STOCK.  Except as specifically disclosed to HI,
     NorAm will not and it will not permit any of its subsidiaries to: (i)
     declare or pay any dividends on or make other distributions in respect of
     any of its capital stock or partnership interests, except for the
     declaration and payment of (x) regular quarterly cash dividends not in
     excess of $.07 per share of NorAm Common Stock with usual record and
     payment dates for such dividend, (y) regular quarterly cash distributions
     not in excess of $.7813 per share of 6 1/4% Convertible Trust Originated
     Preferred Securities of NorAm Financing I with usual record and payment
     dates for such distribution and (z) dividends from a subsidiary of NorAm to
     NorAm or another subsidiary of NorAm and except for cash dividends or
     distributions paid on or with respect to the capital stock or partnership
     interests of a subsidiary of NorAm; (ii) split, combine or reclassify any
     of its capital stock or issue or authorize or propose the issuance of any
     other securities in respect of, in lieu of or in substitution for shares of
     NorAm capital stock; or (iii) repurchase, redeem or otherwise acquire, or
     permit any subsidiary to purchase, redeem or otherwise acquire, any shares
     of its capital stock, except as required by the terms of its securities
     outstanding on the date of the Merger Agreement or as contemplated by any
     existing employee benefit plan.
    
 
                                       62
<PAGE>   70
 
   
          ISSUANCE OF SECURITIES.  Except as specifically disclosed to HI, NorAm
     will not and it will not permit any of its subsidiaries to, issue, deliver
     or sell, or authorize or propose to issue, deliver or sell, any shares of
     its capital stock of any class, any Voting Debt (as defined in the Merger
     Agreement) or other voting securities of NorAm or any securities
     convertible into, or any rights, warrants or options to acquire, any such
     shares, Voting Debt or convertible securities, other than: (i) the issuance
     of NorAm Common Stock upon the exercise of stock options granted under the
     NorAm Stock Plans (as defined in the Merger Agreement) which are
     outstanding on the date of the Merger Agreement, or in satisfaction of
     stock grants or stock-based awards made prior to the date of the Merger
     Agreement pursuant to NorAm Stock Plans or upon conversion of the NorAm
     Convertible Debentures; and (ii) issuances by a wholly owned subsidiary of
     its capital stock to its parent.
    
 
   
          GOVERNING DOCUMENTS.  NorAm will not amend or propose to amend its
     Restated Certificate of Incorporation or Bylaws.
    
 
   
          NO ACQUISITIONS.  Other than acquisitions previously disclosed to HI
     or whose purchase price does not exceed $25 million in the aggregate, NorAm
     will not, and it will not permit any of its subsidiaries to, acquire or
     agree to acquire by merging or consolidating with, or by purchasing a
     substantial equity interest in or a substantial portion of the assets of,
     or by any other manner, any business or any corporation, partnership,
     association or other business organization or division thereof.
    
 
   
          NO DISPOSITIONS.  Other than dispositions in the ordinary course of
     business consistent with past practice which are not material, individually
     or in the aggregate, to NorAm and its subsidiaries taken as a whole, or
     dispositions as to which the aggregate market value is not in excess of $10
     million, NorAm will not, and it will not permit any of its subsidiaries to,
     sell, lease, encumber or otherwise dispose of, or agree to sell, lease
     (whether such lease is an operating or capital lease), encumber or
     otherwise dispose of, any of its assets.
    
 
   
          NO DISSOLUTION, ETC.  NorAm will not authorize, recommend, propose or
     announce an intention to adopt a plan of complete or partial liquidation or
     dissolution of such party or any of its Significant Subsidiaries (as
     defined in the Merger Agreement).
    
 
   
          CERTAIN EMPLOYEE MATTERS.  Except as may be required by applicable law
     or any agreement to which NorAm or any NorAm Affiliate (as defined in the
     Merger Agreement) is a party on the date of the Merger Agreement or as
     expressly contemplated by the Merger Agreement, NorAm will not, nor will it
     permit any NorAm Affiliate to:
    
 
             (i) amend, or increase the amount of (or accelerate the payment or
        vesting of) any benefit or amount payable under, any employee benefit
        plan or any other contract, agreement, commitment, arrangement, plan or
        policy providing for compensation or benefits to any current or former
        director, officer, employee or independent contractor who would be
        deemed to be an employee under applicable guidelines published by the
        Internal Revenue Service, and maintained by, contributed to or entered
        into by, NorAm or any NorAm Affiliate;
 
             (ii) increase (or enter into any contract, agreement, commitment or
        arrangement to increase in any manner) the compensation or fringe
        benefits, or otherwise to extend, expand or enhance the engagement,
        employment or any related rights, of any current or former director,
        officer, employee or independent contractor who would be deemed to be an
        employee under applicable guidelines published by the Internal Revenue
        Service, of NorAm or any NorAm Affiliate (a "NorAm Covered Person"),
        except for normal increases in the ordinary course of business
        consistent with past practice that, in the aggregate, do not result in a
        material increase in benefits or compensation expense to NorAm or any
        NorAm Affiliate;
 
             (iii) adopt, establish or implement any plan, policy or other
        arrangement providing for any form of benefits or other compensation to
        any NorAm Covered Person;
 
             (iv) enter into or amend any employment agreement, severance
        agreement or other contract, agreement or arrangement with any NorAm
        Covered Person; or
 
                                       63
<PAGE>   71
 
             (v) pay or agree to pay any pension, retirement allowance or other
        benefit not required or contemplated by any of the existing NorAm
        Benefit Plans as in effect on the date of this Agreement to any NorAm
        Covered Person.
 
   
          INDEBTEDNESS; LEASES; CAPITAL EXPENDITURES.  NorAm will not, nor will
     NorAm permit any of its subsidiaries to, (i) incur any indebtedness for
     borrowed money (except under NorAm's existing credit facilities, including
     NorAm's receivable sales facility, and renewals thereof, and refinancings
     of existing debt that permit prepayment of such debt without penalty) or
     guarantee any such indebtedness or issue or sell any debt securities or
     warrants or rights to acquire any debt securities of such party or any of
     its subsidiaries or guarantee any debt securities of others, (ii) except in
     the ordinary course of business, enter into any lease (whether such lease
     is an operating or capital lease) or create any mortgages, liens, security
     interests or other encumbrances on the property of NorAm or any of its
     subsidiaries in connection with any indebtedness thereof, or (iii) make or
     commit to make capital expenditures not provided for in the capital budget,
     as amended and approved by NorAm prior to the date of the Merger Agreement.
    
 
   
          ACCOUNTING.  NorAm will not, nor will it permit any of its
     subsidiaries to, make any changes in their accounting methods which would
     be required to be disclosed under the rules and regulations of the SEC,
     except as required by law, rule, regulation or generally accepted
     accounting principles.
    
 
   
          AFFILIATE TRANSACTIONS.  NorAm will not, nor will it permit any of its
     subsidiaries to, enter into any agreement or arrangement with any of their
     respective affiliates (as such term is defined in Rule 405 under the
     Securities Act), other than with wholly owned subsidiaries of NorAm, on
     terms materially less favorable to NorAm or such Subsidiary, as the case
     may be, than could be reasonably expected to have been obtained with an
     unaffiliated third party on an arm's-length basis.
    
 
   
          RATE MATTERS.  Subject to applicable law and except for non-material
     filings in the ordinary course of business consistent with past practices,
     ten business days prior to making any filing regarding any changes in its
     or its subsidiaries' rates or charges (other than pass-through fuel and gas
     rates or charges under existing tariffs or rate schedules), standards of
     service, accounting or the services it provides (or any amendment thereto)
     with any Governmental Entity, NorAm will, and will cause its subsidiaries
     to, deliver a copy of such filing or amendment to HI. NorAm will, and will
     cause its subsidiaries to, make all such filings only in the ordinary
     course of business consistent with past practices.
    
 
   
          CONTRACTS.  NorAm will not, nor will it permit any of its subsidiaries
     to, except in the ordinary course of business consistent with past practice
     and NorAm policy, modify, amend, terminate, renew or fail to use reasonable
     business efforts to renew any material contract or agreement to which it or
     any of its subsidiaries is a party or waive, release or assign any material
     rights or claims. NorAm will not, nor will it permit any of its
     subsidiaries to, enter into any contract involving total consideration of
     $10 million or more, or in the case of NES, any gas or power marketing
     contract involving total consideration of $50 million or more, with a term
     longer than one year which is not terminable by NorAm or any such
     subsidiary of NorAm without penalty upon no more than 30 days' prior
     notice.
    
 
   
          INSURANCE.  NorAm will, and will cause its subsidiaries to, maintain
     with financially responsible insurance companies insurance in such amounts
     and against such risks and losses as are customary for companies engaged in
     their respective businesses.
    
 
   
          PERMITS.  NorAm will, and will cause its subsidiaries to, use
     reasonable efforts to maintain in effect all existing NorAm Permits (as
     defined in the Merger Agreement) which are material to their respective
     operations.
    
 
   
          TAX MATTERS.  NorAm will not (i) make or rescind any material express
     or deemed election relating to Taxes (as defined in the Merger Agreement)
     unless it is reasonably expected that such action will not adversely affect
     NorAm, including elections for any and all joint ventures, partnerships,
     limited liability companies, working interests or other investments where
     NorAm has the capacity to make such binding election, (ii) settle or
     compromise any material claim, action, suit, litigation, proceeding,
     arbitration, investigation, audit or controversy relating to Taxes, except
     where such settlement or compromise will not
    
 
                                       64
<PAGE>   72
 
     adversely affect NorAm or (iii) change in any material respect any of its
     methods of reporting income or deductions for federal income tax purposes
     from those expected to be employed in the preparation of its federal income
     tax return for the taxable year ending December 31, 1995, except as may be
     required by applicable law or except for such changes that are reasonably
     expected not to adversely affect NorAm.
 
   
          DISCHARGE OF LIABILITIES.  NorAm will not, nor will it permit any of
     its subsidiaries to, pay, discharge or satisfy any material claims,
     liabilities or obligations (absolute, accrued, asserted or unasserted,
     contingent or otherwise), other than the payment, discharge or
     satisfaction, in the ordinary course of business consistent with past
     practice (which includes the payment of final and unappealable judgments)
     or in accordance with their terms, of liabilities reflected or reserved
     against in, or contemplated by, the most recent consolidated financial
     statements (or the notes thereto) of NorAm included in NorAm's Annual
     Report on Form 10-K for the fiscal year ended December 31, 1995, or
     incurred in the ordinary course of business consistent with past practice.
    
 
   
          OTHER ACTIONS.  NorAm will not, and will not permit any of its
     subsidiaries to, take or fail to take any other action which would
     reasonably be expected to prevent or materially impede, interfere with or
     delay the Transaction.
    
 
   
          AGREEMENTS.  NorAm will not, nor will it permit any of its
     subsidiaries to, agree in writing or otherwise to take any action
     inconsistent with the foregoing.
    
 
          NO SOLICITATION.  From and after the date of the Merger Agreement,
     NorAm will not, and will not authorize or permit any of its officers,
     directors, employees, agents and other representatives or those of any of
     its subsidiaries (collectively, "NorAm Representatives") to, directly or
     indirectly, solicit, initiate or encourage (including by way of providing
     information) any prospective buyer or the making of any proposal which
     constitutes, or may reasonably be expected to lead to, an Acquisition
     Proposal (as defined herein) from any person or engage in any discussions
     or negotiations with respect thereto or otherwise cooperate with or assist
     or participate in, or facilitate, any such proposal; provided, however,
     that, notwithstanding any other provision of the Merger Agreement, (i)
     NorAm's Board of Directors may take and disclose to NorAm's stockholders a
     position contemplated by Rule 14e-2(a) promulgated under the Exchange Act
     and (ii) prior to approval of the Merger Agreement by NorAm's stockholders
     and following receipt from a third party (without any solicitation,
     initiation, encouragement, discussion or negotiation, directly or
     indirectly, by or with NorAm or any NorAm Representatives) of a bona fide
     Acquisition Proposal that is financially superior to the Transaction and
     reasonably capable of being financed (as determined in each case in good
     faith by NorAm's Board of Directors after consultation with NorAm's
     financial advisors), (x) NorAm may engage in discussions or negotiations
     with such third party and may furnish such third party information
     concerning NorAm and its business, properties and assets if such third
     party executes a confidentiality and standstill agreement in reasonably
     customary form and (y) the Board of Directors of NorAm may withdraw, modify
     or not make its recommendation to its stockholders to approve the Merger
     Agreement or terminate the Merger Agreement prior to the approval of the
     Merger Agreement by NorAm's stockholders and after NorAm has given HI at
     least one week's prior notice of its intention to effect such termination,
     has negotiated with HI to make such adjustments to the terms and conditions
     of the Merger Agreement as would enable NorAm to proceed with the
     transactions contemplated by the Merger Agreement and has paid the
     appropriate termination fee to HI, but in each case referred to in the
     foregoing clauses (i) and (ii) only to the extent that the Board of
     Directors of NorAm shall conclude in good faith based on the written advice
     of NorAm's outside counsel that such action is necessary in order for the
     Board of Directors of NorAm to act in a manner that is consistent with its
     fiduciary obligations under applicable law, notwithstanding (1) a binding
     commitment to consummate an agreement of the nature of the Merger Agreement
     entered into in the proper exercise of their applicable fiduciary duties
     and (2) any concessions which may be offered by HI in negotiations
     described above or otherwise. NorAm shall immediately cease and cause to be
     terminated any existing solicitation, initiation, encouragement, activity,
     discussion or negotiation with any parties conducted heretofore by NorAm or
     any NorAm Representatives with respect to any Acquisition Proposal. NorAm
     will promptly notify HI of any such discussions or negotiations, requests
     for such information or the receipt of any Acquisition Proposal, including
     the identity of the person or group engaging in such
 
                                       65
<PAGE>   73
 
     discussions or negotiations, requesting such information or making such
     Acquisition Proposal and the material terms and conditions of any
     Acquisition Proposal. As used in the Merger Agreement, "Acquisition
     Proposal" means any proposal or offer, other than a proposal or offer by HI
     or any of its affiliates, for, or that could be reasonably expected to lead
     to, a tender or exchange offer, a merger, consolidation or other business
     combination involving NorAm or any Significant Subsidiary of NorAm or any
     proposal to acquire in any manner a substantial equity interest in, or any
     substantial portion of the assets of, NorAm or any of its Significant
     Subsidiaries.
 
CERTAIN COVENANTS -- CONDUCT OF BUSINESS OF HI AND HL&P
 
     During the period from the date of the Merger Agreement and continuing
until the Effective Time, HI and HL&P have agreed as to themselves and their
subsidiaries that (except as expressly contemplated or permitted by the Merger
Agreement, or to the extent that NorAm has otherwise consented in writing):
 
   
          DIVIDENDS; CHANGES IN STOCK.  Except as specifically disclosed to
     NorAm, each of HI and HL&P will not (i) engage in any material repurchase
     at a premium, recapitalization, restructuring or reorganization with
     respect to its capital stock (other than (x) pursuant to HI's common stock
     repurchase program or (y) in connection with the Transaction), including,
     without limitation, by way of any extraordinary dividends on or other
     extraordinary distributions in respect of any of its capital stock, (ii)
     engage in any repurchase of HI Common Stock (other than pursuant to the HI
     Stock Plans (as described in the Merger Agreement)) during the period
     beginning 45 days prior to the Effective Time and ending at the Effective
     Time or (iii) amend any material term or provision of the HL&P Common
     Stock.
    
 
   
          GOVERNING DOCUMENTS.  HL&P will not amend or propose to amend its
     Restated Articles of Incorporation with respect to the rights of the
     holders of HL&P Common Stock except as contemplated in the Merger
     Agreement.
    
 
   
          INSURANCE.  HI will, and will cause its subsidiaries to, maintain with
     financially responsible insurance companies insurance in such amounts and
     against such risks and losses as are customary for companies engaged in
     their respective businesses.
    
 
   
          PERMITS.  HL&P and HI will use reasonable efforts to maintain in
     effect all existing HI Permits (as defined in the Merger Agreement) which
     are material to their respective operations.
    
 
   
          CERTAIN ACQUISITIONS.  Other than acquisitions as to which the
     purchase price is not in excess of $200 million, HI will not, and it will
     not permit any of its subsidiaries to, acquire or agree to acquire by
     merging or consolidating with, or by purchasing a substantial equity
     interest in or a substantial portion of the assets of, or by any other
     manner, any business or any corporation, partnership, association or other
     business organization or division thereof the principal business of which
     is not related to the sale, transmission, distribution, marketing or
     generation of electric power or gas or other regulated or unregulated
     utility operations. HI will consult with appropriate NorAm personnel prior
     to any acquisition with a purchase price in excess of $200 million and
     NorAm shall keep any such information strictly confidential.
    
 
   
          OTHER ACTIONS.  Each of HI and HL&P will not, and will not permit any
     of their subsidiaries to, take or fail to take any other action which would
     reasonably be expected to prevent or materially impede, interfere with or
     delay the Transaction.
    
 
   
          AGREEMENTS.  Each of HI and HL&P will not agree in writing or
     otherwise to take any action inconsistent with the foregoing.
    
 
ADDITIONAL AGREEMENTS
 
     Pursuant to the Merger Agreement, HI, HL&P and NorAm have agreed that (i)
they will prepare and file this Joint Proxy Statement/Prospectus and have it
mailed to stockholders at the earliest practicable date, HL&P will prepare and
file with the SEC the Registration Statement, and each will use their best
efforts to
 
                                       66
<PAGE>   74
 
have the Registration Statement declared effective, (ii) they will use their
best efforts to have timely delivered to the other letters from their
independent public accountants, (iii) they will each afford to the other access
to their respective officers, properties and other information as the other
party may reasonably request, (iv) they will each call meetings of their
respective stockholders to be held as promptly as practicable, (v) they will use
all commercially reasonable efforts to obtain any consent, authorization or
approval of any Governmental Entity required in connection with the Transaction
and to obtain all NorAm Required Consents and all HI Required Consents, (vi)
NorAm will provide a list of persons who may be "affiliates" as defined in Rule
145 of the Securities Act, and use its best efforts to obtain from each such
person an undertaking not to transfer shares of HI Common Stock issued to such
person pursuant to the Merger except pursuant to an effective registration
statement or in compliance with Rule 145, (vii) HL&P will take action necessary
to permit it to issue shares of Houston Common Stock pursuant to the Transaction
and will use all reasonable efforts to have approved for listing on the NYSE,
subject to official notice of issuance, the shares of Houston Common Stock to be
issued in the Transaction and shares of Houston Common Stock issued or reserved
for issuance under the NorAm Stock Plans, (viii) they each agree to certain
employee matters (see "the Transaction -- NorAm Employee Matters"), (ix) Houston
will assume certain outstanding stock options to purchase NorAm Common Stock,
convert such options to options to purchase Houston Common Stock (see "The
Transaction -- Merger Consideration -- NorAm Employee Stock Options") and file a
registration statement with respect to such Houston Common Stock subject to the
converted options, (x) Houston will, subject to certain limits, maintain
directors' and officers' liability insurance for officers and directors of NorAm
and its subsidiaries, (xi) Houston will comply with all laws governing the
shutdown of operations of facilities, (xii) HI will take certain actions with
respect to certain indebtedness and credit agreements of NorAm, (xiii) they each
agree to cooperate and use reasonable best efforts to defend any claim arising
from or in connection with the Transaction, (xiv) they will not take any action
that would cause the Transaction not to qualify as a reorganization under
Section 368(a) of the Code, (xv) they will cooperate and consult with the other
regarding press releases and changes that may have a Material Adverse Effect and
(xvi) the Board of Directors of Houston will take such action as may be
necessary to cause the election of four persons, each of whom is mutually agreed
upon by NorAm and HI and was a director of NorAm immediately prior to the date
of the Merger Agreement, to be directors of Houston immediately after the
Effective Time (see "Relationships of the Parties -- Following the
Transaction -- Board of Directors of Houston.").
 
     Each of the parties to the Merger Agreement have agreed to take all
commercially reasonable actions necessary to comply promptly with all legal
requirements which may be imposed on either of them with respect to the
Transaction (including, without limitation, furnishing all information required
under the HSR Act and in connection with approvals of or filings with any other
Governmental Entity) and to promptly cooperate with and furnish information to
each other in connection with any such requirements imposed upon either of them
or any of their subsidiaries in connection with the Transaction. Each party to
the Merger Agreement has agreed to cooperate and use its best efforts to prepare
and file promptly all necessary documentation, to effect all necessary
applications, notices, petitions, filings and other documents, and to use all
commercially reasonable efforts to obtain (and will cooperate with each other in
obtaining) any consent, acquiescence, authorization, order or approval of, or
any exemption or nonopposition by, any Governmental Entity required to be
obtained or made by NorAm, HI, HL&P or any of their subsidiaries in connection
with the Transaction or the taking of any action contemplated thereby or by the
Merger Agreement. In addition, each party to the Merger Agreement has agreed to
take all commercially reasonable actions necessary to obtain all NorAm Required
Consents and all HI Required Consents, as the case may be.
 
AMENDMENT AND WAIVER
 
   
     The Merger Agreement may be amended by the parties thereto, by action taken
or authorized by their respective Boards of Directors, at any time before or
after approval of the HI stockholders and NorAm stockholders, but, after any
such approval, no amendment which by law requires further approval by such
stockholders will be made without such further approval.
    
 
     At any time prior to the Effective Time, the parties to the Merger
Agreement, by action taken or authorized by their respective Boards of
Directors, may, to the extent legally allowed: (i) extend the time for
 
                                       67
<PAGE>   75
 
the performance of any of the obligations or other acts of the other parties;
(ii) waive any inaccuracies in the representations and warranties contained in
the Merger Agreement or in any document delivered pursuant thereto; and (iii)
waive compliance with any of the agreements or conditions contained therein.
 
TERMINATION
 
     The Merger Agreement may be terminated and the Transaction may be abandoned
at any time prior to the Effective Time, whether before or after approval of the
matters presented in connection with the Transaction by the stockholders of
NorAm or HI:
 
          (1) by mutual consent of NorAm and HI;
 
   
          (2) by either NorAm or HI if (i) any Governmental Entity will have
     issued any Injunction or taken any other action permanently restraining,
     enjoining or otherwise prohibiting the consummation of the Transaction and
     such Injunction or other action shall have become final and nonappealable;
     or (ii) any required approval of the stockholders of the other party shall
     not have been obtained by reason of the failure to obtain the required vote
     upon a vote held at a duly held meeting of stockholders or at any
     adjournment thereof;
    
 
   
          (3) by either NorAm or HI if the Transaction will not have been
     consummated by August 11, 1997 (the "Initial Termination Date"); provided,
     however, that the right to so terminate the Merger Agreement shall not be
     available to any party whose breach of any representation or warranty or
     failure to fulfill any covenant or agreement under the Merger Agreement has
     been the cause of or resulted in the failure of the Transaction to occur on
     or before such date; and provided, further, that if on the Initial
     Termination Date the conditions to consummating the Transaction set forth
     under "-- Conditions to the Transaction -- Conditions to Each Party's
     Obligation to Effect the Transaction -- Other Approvals" above will not
     have been fulfilled but all other conditions to consummating the
     Transaction will have been fulfilled or will be capable of being fulfilled,
     then the Initial Termination Date will be extended to December 31, 1997;
    
 
   
          (4) by HI if (i) for any reason NorAm fails to call and hold a
     stockholders meeting for the purpose of voting upon the Merger Agreement
     and the Transaction by February 15, 1997; (ii) NorAm will have failed to
     comply in any material respect with any of the covenants or agreements
     contained in the Merger Agreement to be complied with or performed by NorAm
     at or prior to such date of termination (provided such breach has not been
     cured within 30 days following receipt by NorAm of notice of such breach
     and is existing at the time of termination of the Merger Agreement); (iii)
     any representation or warranty of NorAm contained in the Merger Agreement
     will not be true in all material respects when made or on or at the time of
     termination as if made on such date of termination (except to the extent it
     relates to a particular date) provided such breach has not been cured
     within 30 days following receipt by NorAm of notice of such breach and is
     existing at the time of termination of the Merger Agreement, except where
     the failure to be so true and correct (without giving effect to the
     individual materiality qualifications and thresholds otherwise contained in
     the Merger Agreement) could not reasonably be expected to have a Material
     Adverse Effect on NorAm; (iv) after the date of the Merger Agreement there
     has been any Material Adverse Change (as defined in the Merger Agreement)
     with respect to NorAm, except for general economic changes or changes that
     may affect the industries of NorAm or any of its subsidiaries generally; or
     (v) any Governmental Entity will have issued any Injunction or taken any
     other action permanently imposing, prohibiting or compelling any of the
     limitations, prohibitions or compulsions set forth above in "-- Conditions
     to the Transaction -- Additional Conditions to Obligations of HI, HL&P and
     Merger Sub -- No Material Limitations or Restraints" and such Injunction or
     other action shall have become final and nonappealable;
    
 
   
          (5) by NorAm if (i) other than pursuant to an Alternative Merger, the
     Board of Directors of HI will have withdrawn or modified, in any manner
     which is adverse to NorAm, its recommendation or approval of the
     Transaction or the Merger Agreement and the transactions contemplated
     thereby or will have resolved to do so; (ii) other than pursuant to an
     Alternative Merger, for any reason HI fails to call and hold a stockholders
     meeting for the purpose of voting upon the Merger Agreement and the
    
 
                                       68
<PAGE>   76
 
   
     Transaction by February 15, 1997; (iii) HI, HL&P or Merger Sub will have
     failed to comply in any material respect with any of the covenants or
     agreements contained in the Merger Agreement to be complied with or
     performed by it at or prior to such date of termination (provided such
     breach has not been cured within 30 days following receipt by HI of notice
     of such breach and is existing at the time of termination of the Merger
     Agreement); (iv) any representation or warranty of HI or HL&P contained in
     the Merger Agreement will not be true in all material respects when made or
     on or at the time of termination as if made on such date of termination
     (except to the extent it relates to a particular date) provided such breach
     has not been cured within 30 days following receipt by HI of notice of such
     breach and is existing at the time of termination of the Merger Agreement,
     except where the failure to be so true and correct (without giving effect
     to the individual materiality qualifications and thresholds otherwise
     contained in the Merger Agreement) could not reasonably be expected to have
     a Material Adverse Effect on HI; or (v) after the date of the Merger
     Agreement there has been any Material Adverse Change with respect to HI,
     except for general economic changes or changes that may affect the
     industries of HI or any of its subsidiaries generally;
    
 
   
          (6) by HI, if (i) the Board of Directors of NorAm will have withdrawn
     or modified, in any manner which is adverse to HI, HL&P or Merger Sub, its
     recommendation or approval of the Transaction or the Merger Agreement and
     the transactions contemplated thereby or shall have resolved to do so, or
     (ii) the Board of Directors of NorAm will have recommended to the
     stockholders of NorAm any Acquisition Proposal or any transaction described
     in the definition of Acquisition Proposal, or will have resolved to do so;
     or
    
 
   
          (7) by NorAm, prior to approval of the Merger Agreement by NorAm's
     stockholders, if NorAm shall exercise its termination right described above
     under "-- Certain Covenants -- Conduct of Business of NorAm -- No
     Solicitation"; provided that NorAm may not effect such termination unless
     and until (i) NorAm gives HI at least one week's prior notice of its
     intention to effect such termination; (ii) during such week, NorAm will,
     and will cause its respective financial and legal advisors to, negotiate
     with HI to make such adjustments in the terms and conditions of the Merger
     Agreement as would enable NorAm to proceed with the transactions
     contemplated herein; and (iii) NorAm pays the appropriate termination fee
     to HI concurrently with such termination.
    
 
EXPENSES AND TERMINATION FEE
 
   
     Each party to the Merger Agreement is required to pay all costs and
expenses incurred by it in connection with the Merger Agreement and all the
transactions contemplated thereby except that the filing fees with respect to
this Joint Proxy Statement/Prospectus and the Registration Statement will be
shared equally by HL&P and NorAm.
    
 
     The Merger Agreement provides that:
 
   
          (A) If (i) HI or NorAm terminates the Merger Agreement pursuant to
     clause (ii) of item 6 above or item 7 above or (ii) HI terminates this
     Agreement pursuant to clause (ii) of item 2 above or clause (i) of item 6
     above and at the time of such termination or prior to the NorAm Special
     Meeting there shall have been an Acquisition Proposal, NorAm will, on the
     day of such termination, pay HI a fee of $75 million.
    
 
   
          (B) If HI terminates the Merger Agreement pursuant to clause (i) or
     (ii) of item 4 above, in either case as a result of a willful breach of the
     Merger Agreement by NorAm, and clause (ii) of (A) above does not apply,
     NorAm will, on the day of such termination, pay HI a fee of $35 million.
    
 
   
          (C) If HI terminates the Merger Agreement pursuant to clause (ii) of
     item 2 above or clause (i) of item 6 above and clause (ii) of (A) above
     does not apply, NorAm will, on the day of such termination, pay HI a fee of
     $10 million.
    
 
   
          (D) If NorAm terminates the Merger Agreement pursuant to clause (ii)
     or (iii) of item 5 above, in either case as result of a willful breach of
     this Agreement by HL&P, HI or Merger Sub, HI will, on the day of such
     termination, pay NorAm a fee of $35 million.
    
 
                                       69
<PAGE>   77
 
   
          (E) If NorAm terminates the Merger Agreement pursuant to clause (ii)
     of item 2 above or clause (i) of item 5 above, HI will, on the day of such
     termination, pay NorAm a fee of $10 million.
    
 
   
          (F) If within 12 months of any termination described in item (B) or
     (C) above, NorAm agrees to or consummates an Acquisition Proposal, then
     upon the signing of a definitive agreement relating to such an Acquisition
     Proposal, or, if no such agreement is signed, then at the closing of such
     Acquisition Proposal, NorAm will pay HI a fee equal to $75 million minus
     any amounts as may have been previously paid by NorAm pursuant to items
     described above.
    
 
                                       70
<PAGE>   78
 
          UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS
 
     The following unaudited pro forma financial statements give effect to the
Transaction. The unaudited pro forma condensed balance sheet as of June 30, 1996
is presented as if the Transaction had occurred on that date. The unaudited pro
forma condensed statements of income for the year ended December 31, 1995 and
the six months ended June 30, 1996 assume that the Transaction occurred at the
beginning of each period presented. The acquisition of NorAm will be treated as
a purchase for accounting purposes. The assets acquired and the liabilities
assumed will be recorded at their fair values.
 
     The unaudited pro forma financial statements should be read in conjunction
with the historical financial statements of HI and NorAm and "Management's
Discussion and Analysis of Financial Condition and Results of Operations" of HI
and NorAm incorporated by reference herein. See "Incorporation of Certain
Documents by Reference." The unaudited pro forma condensed statements of income
are not necessarily indicative of the financial results that would have occurred
had the Transaction been consummated on the indicated dates, nor are they
necessarily indicative of future financial results. Results for the interim
periods do not necessarily indicate results for the full year.
 
     The pro forma adjustments are based on preliminary assumptions and
estimates made by HI's management and do not reflect adjustments for anticipated
operating efficiencies and cost savings HI expects to achieve as a result of the
merger. The actual allocation of the consideration paid for NorAm may differ
from that reflected in the unaudited pro forma combined condensed financial
statements after a more extensive review of the fair market values of the assets
acquired and liabilities assumed has been completed. Amounts allocated will be
based upon the estimated fair values at the Effective Time of the Transaction,
which could vary significantly from the amounts as of June 30, 1996.
 
                                       71
<PAGE>   79
 
                  UNAUDITED PRO FORMA CONDENSED BALANCE SHEET
                                 JUNE 30, 1996
                             (THOUSANDS OF DOLLARS)
 
                                     ASSETS
 
<TABLE>
<CAPTION>
                                                        HISTORICAL                       PRO FORMA
                                                --------------------------     ------------------------------
                                                    HI            NORAM        ADJUSTMENTS         COMBINED
                                                -----------     ----------     -----------        -----------
<S>                                             <C>             <C>            <C>                <C>
Net Property, Plant and Equipment.............  $ 8,800,025     $2,405,904     $  463,983 (d)     $11,669,912
                                                -----------     ----------     ----------         -----------
Current Assets:
  Cash and cash equivalents...................        5,150         21,600        (21,600)(e)           5,150
  Accounts and notes receivable -- net........       94,335        336,714                            431,049
  Inventories.................................      199,359         80,164                            279,523
  Other.......................................       33,926         31,958                             65,884
                                                -----------     ----------     ----------         -----------
      Total...................................      332,770        470,436        (21,600)            781,606
                                                -----------     ----------     ----------         -----------
Investments and Other Assets:
  Investment in Time Warner securities........    1,029,250                                         1,029,250
  Deferred plant costs -- net.................      600,243                                           600,243
  Investments in and advances to
    unconsolidated affiliates -- net..........      479,958                                           479,958
  Goodwill....................................                     474,032       (474,032)(e)       1,868,226
                                                                                1,868,226 (e)
  Other.......................................      932,540        245,955        (31,700)(i)       1,146,795
                                                -----------     ----------     ----------         -----------
      Total...................................    3,041,991        719,987      1,362,494           5,124,472
                                                -----------     ----------     ----------         -----------
         Total................................  $12,174,786     $3,596,327     $1,804,877         $17,575,990
                                                ===========     ==========     ==========         ===========

                                       CAPITALIZATION AND LIABILITIES
Capitalization:
  Common stock equity.........................  $ 4,051,677     $  787,895     $1,227,672 (a)     $ 5,279,349
                                                                                 (787,895)(e)
  Preferred stock -- not subject to mandatory
    redemption................................      351,345                                           351,345
  NorAm obligated mandatorily redeemable,
    convertible preferred securities of
    subsidiary trust..........................                     167,762       (167,762)(e)               0
  Long-term debt, less current maturities.....    3,062,281      1,106,969      1,274,595 (b)       5,494,911
                                                                                   51,066 (c)
                                                -----------     ----------     ----------         -----------
         Total................................    7,465,303      2,062,626      1,597,676          11,125,605
                                                -----------     ----------     ----------         -----------
Current Liabilities:
  Notes payable...............................      832,136                                           832,136
  Accounts payable............................      166,658        421,652                            588,310
  Taxes accrued...............................      133,520         56,047                            189,567
  Interest accrued............................       73,459         34,188                            107,647
  Dividends declared..........................       98,056                                            98,056
  Current portion of long-term debt and
    preferred stock...........................      419,457        280,250                            699,707
  Other.......................................      140,069        138,272                            278,341
                                                -----------     ----------     ----------         -----------
      Total...................................    1,863,355        930,409                          2,793,764
                                                -----------     ----------     ----------         -----------
Other Liabilities and Deferred Credits:
  Accumulated deferred income taxes...........    2,054,248        313,296         93,701 (e)       2,461,245
  Unamortized investment tax credit...........      382,425                                           382,425
  Other.......................................      409,455        289,996        113,500 (i)         812,951
                                                -----------     ----------     ----------         -----------
      Total...................................    2,846,128        603,292        207,201           3,656,621
                                                -----------     ----------     ----------         -----------
         Total................................  $12,174,786     $3,596,327     $1,804,877         $17,575,990
                                                ===========     ==========     ==========         ===========
</TABLE>
 
             See Notes to Unaudited Pro Forma Financial Statements.
 
                                       72
<PAGE>   80
 
               UNAUDITED PRO FORMA CONDENSED STATEMENT OF INCOME
                      FOR THE YEAR ENDED DECEMBER 31, 1995
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                            HISTORICAL                       PRO FORMA
                                     -------------------------     ------------------------------
                                         HI           NORAM        ADJUSTMENTS         COMBINED
                                     ----------     ----------     -----------        -----------
<S>                                  <C>            <C>            <C>                <C>
Operating Revenues:
  Electric.........................  $3,680,297                                       $ 3,680,297
  Gas..............................                 $2,964,679                          2,964,679
  Other............................      49,876                                            49,876
                                     ----------     ----------       --------          ----------
          Total....................   3,730,173      2,964,679                          6,694,852
                                     ----------     ----------       --------          ----------
Operating Expenses:
  Electric fuel and purchased
     power.........................   1,112,642                                         1,112,642
  Gas purchased....................                  1,857,166                          1,857,166
  Operation and maintenance........     866,170        570,508      $  (8,541)(i)       1,428,137
  Depreciation and amortization....     478,034        147,109         15,466 (d)         673,115
                                                                       32,506 (e)
  Taxes other than income taxes....     245,890        102,591                            348,481
  Other............................     122,504                                           122,504
                                     ----------     ----------       --------          ----------
          Total....................   2,825,240      2,677,374         39,431           5,542,045
                                     ----------     ----------       --------          ----------
Operating Income...................     904,933        287,305        (39,431)          1,152,807
                                     ----------     ----------       --------          ----------
Other Income (Expense):
  Time Warner dividend income......      20,132                                            20,132
  Other............................      (1,770)        (8,438)                           (10,208)
                                     ----------     ----------       --------          ----------
          Total....................      18,362         (8,438)                             9,924
                                     ----------     ----------       --------          ----------
Interest and Other Charges.........     296,385        157,959         79,015 (c)         533,359
                                     ----------     ----------       --------          ----------
From Continuing Operations:
  Income before income taxes.......     626,910        120,908       (118,446)            629,372
  Income taxes.....................     199,555         55,379        (30,079)(h)         224,855
                                     ----------     ----------       --------          ----------
  Income before preferred
     dividends.....................     427,355         65,529        (88,367)            404,517
  Preferred dividends..............      29,955          7,800                             37,755
                                     ----------     ----------       --------          ----------
  Income available for common
     stock.........................  $  397,400     $   57,729      $ (88,367)        $   366,762
                                     ==========     ==========       ========          ==========
  Weighted average common shares
     outstanding...................     247,706        123,868                            299,671(g)
  Earnings per common share........  $     1.60     $      .47                        $      1.22
</TABLE>
 
             See Notes to Unaudited Pro Forma Financial Statements.
 
                                       73
<PAGE>   81
 
               UNAUDITED PRO FORMA CONDENSED STATEMENT OF INCOME
                     FOR THE SIX MONTHS ENDED JUNE 30, 1996
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
 
<TABLE>
<CAPTION>
                                                     HISTORICAL                   PRO FORMA
                                               -----------------------   ---------------------------
                                                   HI         NORAM      ADJUSTMENTS       COMBINED
                                               ----------   ----------   -----------      ----------
<S>                                            <C>          <C>          <C>              <C>
Operating Revenues:
  Electric...................................  $1,911,936                                 $1,911,936
  Gas........................................               $2,308,988                     2,308,988
  Other......................................      26,248                                     26,248
                                               ----------   ----------     --------       ----------
          Total..............................   1,938,184    2,308,988                     4,247,172
                                               ----------   ----------     --------       ----------
Operating Expenses:
  Electric fuel and purchased power..........     650,604                                    650,604
  Gas purchased..............................                1,712,539                     1,712,539
  Operation and maintenance..................     430,814      253,640    $  (4,271)(i)      680,183
  Depreciation and amortization..............     258,858       71,572        7,733 (d)      354,416
                                                                             16,253 (e)
  Taxes other than income taxes..............     127,868       62,638                       190,506
  Other......................................      46,293       22,344                        68,637
                                               ----------   ----------     --------       ----------
          Total..............................   1,514,437    2,122,733       19,715        3,656,885
                                               ----------   ----------     --------       ----------
Operating Income.............................     423,747      186,255      (19,715)         590,287
                                               ----------   ----------     --------       ----------
Other Income (Expense):
  Litigation settlements.....................     (95,000)                                   (95,000)
  Time Warner dividend income................      20,805                                     20,805
  Other......................................       1,520       (5,753)                       (4,233)
                                               ----------   ----------     --------       ----------
          Total..............................     (72,675)      (5,753)                      (78,428)
                                               ----------   ----------     --------       ----------
                                                                             38,742 (c)
Interest and Other Charges...................     149,944       71,132         (425)(f)      259,393
                                               ----------   ----------     --------       ----------
From Continuing Operations:
  Income before income taxes.................     201,128      109,370      (58,032)         252,466
  Income taxes...............................      60,589       45,838      (14,623)(h)       91,804
                                               ----------   ----------     --------       ----------
  Income before preferred dividends..........     140,539       63,532      (43,409)         160,662
  Preferred dividends........................      11,945        3,597                        15,542
                                               ----------   ----------     --------       ----------
  Income available for common stock..........  $  128,594   $   59,935    $ (43,409)      $  145,120
                                               ==========   ==========     ========       ==========
  Weighted average common shares
     outstanding.............................     248,561      125,995                       300,526(g)
  Earnings per common share..................  $      .52   $      .48                    $      .48
</TABLE>
 
             See Notes to Unaudited Pro Forma Financial Statements.
 
                                       74
<PAGE>   82
 
               NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS
 
(a) NorAm Common Stock to be exchanged:
 
   
<TABLE>
<CAPTION>
                                                                          (THOUSANDS, EXCEPT
                                                                           PRICE PER SHARE)
                                                                          ------------------
    <S>                                                                   <C>
    NorAm common shares outstanding at June 30, 1996....................         136,979
    Common stock equivalents and other dilutive securities assumed to be
      converted or exercised prior to closing:
      NorAm obligated mandatorily redeemable, convertible preferred
         securities of subsidiary trust ("Convertible Preferred
         Securities") -- 3.45 million shares outstanding at June 30,
         1996, to be converted at a rate of 4.1237 shares of common
         stock per share of preferred stock, $50 par value..............          14,227
      NorAm stock options and restricted stock at June 30, 1996.........           2,253
                                                                              ----------
    Pro forma NorAm common stock and stock equivalents outstanding at
      June 30, 1996.....................................................         153,459
    Purchase price per share............................................      $       16
                                                                              ----------
    Total consideration.................................................      $2,455,344
                                                                              ==========
         Value of HI common stock consideration.........................      $1,227,672
                                                                              ==========
         Cash consideration.............................................      $1,227,672
                                                                              ==========
</TABLE>
    
 
     Total consideration is calculated assuming a purchase price of $16 per
     share of NorAm Common Stock, an HI Common Stock price per share of $23.625
     (the closing price of HI Common Stock as of August 9, 1996), conversion of
     all NorAm Convertible Preferred Securities, exercise of all outstanding
     NorAm stock options and that the number of shares of NorAm Common Stock
     outstanding at the effective date of the acquisition is equal to that
     outstanding on June 30, 1996.
 
     Total consideration is dependent upon the number of shares of NorAm Common
     Stock outstanding as of the effective date of the acquisition and the price
     per share of HI Common Stock as discussed following. The actual number of
     equivalent HI common shares exchanged will depend upon the average daily
     closing price of HI Common Stock on the NYSE during a 20-trading-day period
     commencing 25 trading days prior to the effective date of the acquisition
     ("Average Price"). The Stock Consideration will have a value (based on the
     average closing price) of $16.00 per share of NorAm Common Stock if the
     Average Price of HI Common Stock is greater than or equal to $21.25 and
     less than or equal to $26.00. The Stock Consideration will have a value
     (based on the average closing price) greater than $16.00 per share of NorAm
     Common Stock if the Average Price of HI Common Stock is greater than
     $26.00, and a value (based on the average closing price) less than $16.00
     per share of NorAm Common Stock if the Average Price of HI Common Stock is
     less than $21.25.
 
(b) Acquisition debt is calculated based on the following assumptions:
 
<TABLE>
<CAPTION>
                                                                               (THOUSANDS)
                                                                               ----------
    <S>                                                                        <C>
    Cash consideration -- see note (a).......................................  $1,227,672
    Transaction costs........................................................      32,000
    Severance costs..........................................................      47,000
    Less:
      NorAm cash balance as of June 30, 1996.................................     (21,600)
      Proceeds from exercise of NorAm stock options..........................     (10,477)
                                                                               ----------
              Total acquisition debt.........................................  $1,274,595
                                                                               ==========
</TABLE>
 
                                       75
<PAGE>   83
 
        NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS -- (CONTINUED)
 
(c) Interest expense and fair value adjustments for long-term debt are as
     follows:
 
<TABLE>
<CAPTION>
                                                                          (THOUSANDS)
                                                                    -----------------------
    <S>                                                             <C>          <C>
    Acquisition debt -- see note (b)..........................................   $1,274,595
    Assumed interest rate on acquisition debt.................................        7.25%(1)
      Adjustment to 1995 interest expense for acquisition debt................       92,408
      Adjustment to interest expense for acquisition debt for the first
         six months of 1996...................................................       46,204
    NorAm debt assumed at June 30, 1996:
      Principal amount............................................  $1,387,219
      Fair value..................................................   1,438,285
                                                                    ----------
      Revaluation adjustment of debt assumed to fair value........  $   51,066
                                                                    ==========
      Adjustment to 1995 interest expense for revaluation of long-term
         debt assumed.........................................................      (13,393)
      Adjustment to interest expense for revaluation of long-term debt assumed
         for the first six months of 1996.....................................       (7,462)
    Total interest expense adjustment for 1995................................   $   79,015
    Total interest expense adjustment for the first six months of 1996........   $   38,742
</TABLE>
 
- ---------------
 
   
        (1) For purposes of the unaudited pro forma condensed statements of
            income, the annual interest rate on the acquisition debt is assumed
            to be 7.25%. A 1% change in the interest rate on the acquisition
            debt would change 1995 interest expense by $12.8 million and
            interest expense for the first six months of 1996 by $6.4 million.
            The cash portion of the consideration is expected to be obtained
            through bank loans under a revolving credit and letter of credit
            facility which will be negotiated with a syndicate of banks and
            financial institutions. While the terms of the facility have not
            been negotiated, HI believes that the interest rate assumed is
            indicative of general market conditions for a BBB credit with a
            medium term fixed rate obligation.
    
 
(d) Based upon preliminary analyses, the following adjustments have been made to
     reflect the fair value of property, plant and equipment:
 
<TABLE>
<CAPTION>
                                                                                 (THOUSANDS)
                                                                                 ----------
    <S>                                                             <C>          <C>
    Revaluation of property, plant and equipment to fair value................   $  463,983
    Adjustment to 1995 depreciation expense (assumes 30-year average
      depreciable life).......................................................   $   15,466
    Adjustment to depreciation expense for the first six months of 1996.......   $    7,733
</TABLE>
 
                                       76
<PAGE>   84
 
        NOTES TO UNAUDITED PRO FORMA FINANCIAL STATEMENTS -- (CONTINUED)
 
(e) The excess of the total purchase price over the allocation of fair value to
     the net assets will be recorded as goodwill. HI's calculation of goodwill
     is based on the following assumptions and calculations:
 
<TABLE>
<CAPTION>
                                                                               (THOUSANDS)
                                                                               ----------
    <S>                                                                        <C>
    Value of HI Common Stock consideration -- see note (a)...................  $1,227,672
    Acquisition debt -- see note (b).........................................   1,274,595
    Net asset value of NorAm at June 30, 1996:
      Total stockholders' equity.............................................    (787,895)
      NorAm Convertible Preferred Securities.................................    (167,762)
      NorAm cash (used to offset acquisition debt)...........................      21,600
                                                                               ----------
    Initial purchase price in excess of historical net asset value...........   1,568,210
    Increase (decrease) from fair value allocations:
      Property, plant and equipment -- see note (d)..........................    (463,983)
      Elimination of NorAm historical goodwill...............................     474,032
      Unrecognized pension liability -- see note (i).........................      31,700
      Unrecognized postretirement benefits liability -- see note (i).........     113,500
      Debt assumed -- see note (c)...........................................      51,066
      Deferred income tax on fair value allocation adjustments...............      93,701
                                                                               ----------
         Total goodwill......................................................  $1,868,226
                                                                               ==========
    Increase in goodwill amortization expense (assumes 40-year life).........  $   46,706
    Less NorAm historical goodwill amortization..............................     (14,200)
                                                                               ----------
           Adjustment to 1995 amortization expense...........................  $   32,506
                                                                               ==========
           Adjustment to amortization expense for the first six months of
      1996...................................................................  $   16,253
                                                                               ==========
</TABLE>
 
(f) Assumes full conversion of NorAm Convertible Preferred Securities into
    shares of NorAm Common Stock and cash at the effective date of the
    acquisition (see note (a)). For a further description of the conversion
    feature, see "The Transaction -- Merger Consideration -- NorAm Convertible
    Securities." Because of the assumed conversion, $425,000 of preferred
    dividends of subsidiary trust have been eliminated for the first six months
    of 1996.
 
(g) Pro forma number of common shares outstanding represents the historical
    weighted average shares outstanding of HI Common Stock in addition to the
    pro forma number of shares of HI Common Stock assumed to be issued in
    exchange for the NorAm Common Stock and stock equivalents.
 
<TABLE>
<CAPTION>
                                                                          (THOUSANDS, EXCEPT
                                                                           PRICE PER SHARE)
                                                                          ------------------
    <S>                                                                   <C>
    Value of HI Common Stock consideration -- see note (a)..............      $1,227,672
    Divided by closing market price per share of HI Common Stock on
      August 9, 1996....................................................      $   23.625
                                                                              ----------
      Assumed number of shares of HI Common Stock issued................          51,965
                                                                              ==========
</TABLE>
 
(h) Represents the tax effect at the statutory rate of all pre-tax pro forma
    adjustments after excluding nondeductible goodwill amortization.
 
(i) Pension and postretirement benefits liabilities:
 
<TABLE>
<CAPTION>
                                                                               (THOUSANDS)
                                                                               -----------
    <S>                                                                        <C>
      Unrecognized pension liability -- see note (e).......................     $  31,700
                                                                                =========
      Unrecognized postretirement benefits liability -- see note (e).......     $ 113,500
                                                                                =========
      Adjustment to 1995 operation and maintenance expense (assumes 17-year
         amortization period)..............................................     $  (8,541)
                                                                                =========
      Adjustment to operation and maintenance expense for the first six
         months of 1996....................................................     $  (4,271)
                                                                                =========
</TABLE>
 
                                       77
<PAGE>   85
 
                          RELATIONSHIPS OF THE PARTIES
PRIOR TO THE TRANSACTION
 
     Other than with respect to the Merger Agreement, the business relationships
and transactions between NorAm and its subsidiaries and HI and its subsidiaries
have been in the ordinary course of business and have not been in the aggregate
material to either NorAm or HI.
 
FOLLOWING THE TRANSACTION
 
     BOARD OF DIRECTORS OF HOUSTON.  Pursuant to the Merger Agreement, HI and
HL&P agreed that the Houston Board of Directors would take such action as may be
necessary to cause the election of four directors of NorAm as mutually agreed
upon by NorAm and HI, to be directors of Houston immediately after the Effective
Time. Accordingly, T. Milton Honea, Robert C. Hanna, O. Holcombe Crosswell and
Joseph M. Grant have been nominated to be elected as directors of Houston
effective as of the Effective Time. Mr. Honea has been nominated to be elected
as a Class II director (to serve until the 1997 annual meeting), Mr. Hanna has
been nominated to be elected as a Class III director (to serve until the 1998
annual meeting) and Messrs. Crosswell and Grant have been nominated to be
elected as Class I directors (to serve until the 1999 annual meeting). A vote
for approval of the Merger Agreement by the holders of HI Common Stock will be a
vote for the election of such nominees to serve as directors of Houston
effective of the Effective Time.
 
     Set forth below is certain information about each of these nominees who,
following consummation of the Transaction, will be members of the Houston Board
of Directors:
 
<TABLE>
<CAPTION>
                           YEAR FIRST SERVED
                           AS A DIRECTOR OF                     OTHER BUSINESS POSITIONS
          NAME                   NORAM         AGE                   AND EXPERIENCE
- -------------------------  -----------------   ---   -----------------------------------------------
<S>                        <C>                 <C>   <C>
T. Milton Honea..........         1992         63    Mr. Honea has been Chairman of the Board and
                                                     Chief Executive Officer of NorAm since December
                                                     1992. He was Vice Chairman of the Board of
                                                     NorAm from July 1992 through December 1992. He
                                                     was Executive Vice President of NorAm from
                                                     October 1991 until July 1992. He was President
                                                     and Chief Operating Officer of Arkansas
                                                     Louisiana Gas Company, a division of NorAm from
                                                     October 1984 to October 1991.
Robert C. Hanna..........         1989         67    Mr. Hanna was President and Chief Executive
                                                     Officer of Imperial Holly Corporation and
                                                     Chairman of Holly Sugar Corporation prior to
                                                     his retirement on September 30, 1993 and was a
                                                     director of Imperial Holly Corporation until
                                                     July 1996. He is also currently serving as
                                                     Chairman of The George Foundation.
O. Holcombe Crosswell....         1988         55    Mr. Crosswell is President of Griggs
                                                     Corporation, a real estate and investment
                                                     company in Houston, Texas.
Joseph M. Grant..........         1995         57    Mr. Grant is the Senior Vice President and
                                                     Chief Financial Officer of Electronic Data
                                                     Systems Corporation ("EDS"), and has been with
                                                     EDS since December 1990. He is on the Board of
                                                     Directors of EDS, American Eagle Group,
                                                     Incorporated and Heritage Media Corporation.
                                                     Prior to December 1990, Mr. Grant was Executive
                                                     Vice President of American General Corporation.
</TABLE>
 
   
     DIVIDENDS.  It is currently anticipated that a $1.50 per share annual
dividend will be maintained on Houston Common Stock following consummation of
the Transaction. However, future dividends will be subject to determination
based upon the results of operations and financial condition of Houston,
Houston's
    
 
                                       78
<PAGE>   86
 
   
future business prospects, any applicable contractual restrictions and such
other factors as the Houston Board of Directors considers relevant.
    
 
                      DESCRIPTION OF HOUSTON CAPITAL STOCK
 
   
     The following description of the capital stock of Houston is subject to the
more complete descriptions set forth in the Houston Articles of Incorporation
(as defined below) and the Houston Bylaws (the HI Bylaws prior to the HI/HL&P
Merger Effective Time). The description set forth below assumes the consummation
of the Transaction (other than the Second Alternative Merger) and gives effect
to the proposed Amendment to Articles of Incorporation attached as Exhibit A to
the Merger Agreement (the "Houston Articles of Amendment"), which is attached
hereto as Appendix A, which will become effective at the HI/HL&P Merger
Effective Time. At the HI/HL&P Merger Effective Time, the authorized capital
stock of Houston will consist of 700,000,000 shares of Houston Common Stock,
10,000,000 shares of Houston Preferred Stock and 10,000,000 shares of Preference
Stock, without par value, of Houston (the "Houston Preference Stock"). The HL&P
Restated Articles of Incorporation, as amended and after giving effect to the
Houston Articles of Amendment, are referred to herein as the "Houston Articles
of Incorporation." As of October   , 1996, there were outstanding        shares
of Cumulative Preferred Stock, without par value, of HL&P and        shares of
HI Common Stock.
    
 
   
     If the Second Alternative Merger is consummated in lieu of the Basic
Mergers, then NorAm stockholders will receive HI Common Stock rather than
Houston Common Stock. The terms and provisions of HI Common Stock are
substantially similar to the Houston Common Stock described below, except as
otherwise described in "Comparative Rights of Stockholders -- Mergers and Other
Fundamental Transactions" and "-- Amendments to Charter." A description of HI
Common Stock and associated HI Rights is incorporated herein by reference. See
item G of the list of documents incorporated by reference into this Joint Proxy
Statement/Prospectus in "Incorporation of Certain Documents by Reference." The
authorized capital stock of HI consists of 400,000,000 shares of HI Common Stock
and 10,000,000 shares of Preference Stock. As of October   , 1996, there were no
outstanding shares of Preference Stock of HI.
    
 
COMMON STOCK
 
   
     VOTING RIGHTS.  Holders of Houston Common Stock will be entitled to one
vote for each share at all meetings of shareholders. Such holders will not have
cumulative rights in the election of directors. No director of Houston may be
removed from office by vote or other action of the shareholders or otherwise
except (a) with cause, as defined in the Houston Bylaws, by the affirmative vote
of the holders of at least a majority of the voting power of all outstanding
shares of capital stock of Houston entitled to vote in the election of
directors, voting together as a single class, or (b) without cause by (i) the
affirmative vote of at least 80% of all directors then in office at any regular
or special meeting of the Houston Board of Directors called for that purpose or
(ii) the affirmative vote of the holders of at least 80% of the voting power of
all outstanding shares of capital stock of Houston entitled to vote in the
election of directors, voting together as a single class. The Houston Board of
Directors shall have the power to alter, amend or repeal the Bylaws or adopt new
Bylaws by the affirmative vote of at least 80% of all directors then in office
at any regular or special meeting of the Houston Board of Directors called for
that purpose, subject to repeal or change by the affirmative vote of the holders
of at least 80% of the voting power of all the shares of Houston entitled to
vote in the election of directors, voting together as a single class. The
Houston Articles of Incorporation provide that an amendment of the articles of
incorporation of, certain mergers and consolidations involving, the sale of all
or substantially all of the assets of or the dissolution of Houston requires the
approval of the holders of a majority (rather than the two-thirds normally
required by Texas law) of the outstanding shares entitled to vote on such
matters.
    
 
     DIVIDENDS.  Dividends may be paid on Houston Common Stock out of any assets
of Houston available for such dividends after full cumulative dividends on all
outstanding shares of capital stock of all series ranking senior to Houston
Common Stock in respect of dividends and liquidation rights have been paid, or
declared and a sum sufficient for the payment thereof set apart, for all past
quarterly dividend periods, and after or concurrently with making payment of or
provision for dividends on the stock ranking senior to Houston
 
                                       79
<PAGE>   87
 
Common Stock for the then-current quarterly dividend period. The rights of
holders of Houston Common Stock to receive dividends are further subject to the
prior rights of holders of any outstanding shares of capital stock of all series
ranking senior to Houston Common Stock to have contributions made to any sinking
fund that may be established for any such series.
 
     LIQUIDATION RIGHTS.  In the event of any liquidation, dissolution or
winding-up of Houston, or any reduction or decrease of its capital stock
resulting in a distribution of assets to the holders of Houston Common Stock,
the holders of Houston Common Stock shall be entitled to receive, pro rata, all
of the remaining assets of Houston available for distribution to its
shareholders but only after there shall have been paid to or set aside for the
holders of the stock ranking senior to the Houston Common Stock the full
preferential amounts fixed for each series thereof plus any dividends accrued or
in arrears thereon.
 
     CLASSIFICATION OF BOARD OF DIRECTORS.  The Houston Board of Directors is
divided into three classes, Class I, Class II and Class III. Such classes shall
be as nearly equal in number of directors as possible. The initial terms of
office of the Directors of Class I shall expire at the annual meeting of
shareholders in 1997, of Class II shall expire at the annual meeting of
shareholders in 1998 and of Class III shall expire at the annual meeting of
shareholders in 1999. At each annual meeting, the number of directors equal to
the number constituting the class whose term expires at the time of such meeting
shall be elected to hold office until the third succeeding annual meeting.
 
     OTHER PROVISIONS.  The shares of Houston Common Stock, when issued, will be
fully paid and nonassessable; no personal liability will attach to holders of
such shares under the laws of the State of Texas. Subject to the provisions of
the Houston Bylaws imposing certain supermajority voting provisions, the rights
of the holders of shares of Houston Common Stock may not be modified otherwise
than by a vote of two-thirds or more of the shares outstanding, voting together
as a single class.
 
PREFERRED STOCK
 
     The authorized Houston Preferred Stock is issuable in series having such
designations, dividend rates, general voting rights, liquidation prices,
redemption prices, sinking fund provisions and other terms as provided in the
Houston Articles of Incorporation or as may be established from time to time by
the Houston Board of Directors. The rights evidenced by, or amounts payable with
respect to, the shares of Houston Common Stock registered hereby may be
materially limited or qualified by the Houston Preferred Stock.
 
     VOTING RIGHTS.  The holders of Houston Preferred Stock have special voting
rights with respect to certain matters affecting the powers, preferences and
privileges of the Houston Preferred Stock of each respective series. Holders of
Houston Preferred Stock generally have the right to elect one-third of the
members of the Houston Board of Directors whenever dividends on any outstanding
Houston Preferred Stock are in arrears in an amount equal to the aggregate
dividends required to be paid on such Houston Preferred Stock in any 12-month
period, until no dividends are in arrears. However, holders of Houston Preferred
Stock have the right to elect a majority of the members of the Houston Board of
Directors whenever dividends on any outstanding Houston Preferred Stock are in
arrears in an amount equal to the aggregate dividends required to be paid on
such Houston Preferred Stock in any 24-month period, until no dividends are in
arrears. Whenever holders of any outstanding shares of Houston Preferred Stock
are entitled to elect members of the Houston Board of Directors pursuant to the
Houston Articles of Incorporation, a director elected by the holders of Houston
Preferred Stock as a class or of such other stock entitled to vote as a class
(or a director elected to fill a vacancy) shall be subject to removal by the
vote of the holders of a majority of the Houston Preferred Stock as a class or
of such other stock entitled to vote as a class for the election of directors,
as the case may be.
 
     Directors elected by the holders of Houston Preferred Stock (or any
directors elected by such directors to fill a vacancy) shall not be classified
and shall serve for a term ending upon the election and qualification of their
successors following the termination at any time of a right of the holders of
Houston Preferred Stock to elect members of the Houston Board of Directors.
 
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<PAGE>   88
 
     DIVIDENDS.  Holders of Houston Preferred Stock are entitled to receive
cumulative dividends at the rate fixed for each such series and to have
contributions made to any sinking fund that may be established for any such
series before any dividends shall be paid or set apart for any shares of Houston
Common Stock.
 
     LIQUIDATION RIGHTS.  In the event of any liquidation, dissolution or
winding up of Houston, or any reduction or decrease of its capital stock
resulting in a distribution of assets to the holders of Houston Common Stock,
payment to the holders of any outstanding Houston Preferred Stock of the full
preferential amounts fixed for each series thereof, plus an amount equal to any
dividends accrued or in arrears thereon, shall be made prior to the pro rata
distribution of the remaining assets of Houston to the holders of Houston Common
Stock.
 
   
PREFERENCE STOCK
    
 
   
     The Houston Board of Directors, without further action by the Houston
stockholders, will be authorized to issue the Houston Preference Stock in one or
more series and to fix and determine as to any series all the relative rights
and preferences of shares of such series so established, including, without
limitation, preferences, limitations or relative rights with respect to
redemption rights, conversion rights, if any, voting rights, if any, dividend
rights and any preferences on liquidation; provided, however, that the relative
rights of priority of Houston Preference Stock must rank junior to the relative
rights of priority of Houston Preferred Stock. One series of Houston Preference
Stock, the Series A Preference Stock, will be purchasable upon the exercise of a
Houston Right. See "-- Rights Plan."
    
 
CERTAIN PROVISIONS OF THE HOUSTON ARTICLES OF INCORPORATION AND BYLAWS
 
     Neither the Houston Articles of Incorporation nor the Houston Bylaws
contain any provision that would have an effect of delaying, deferring or
preventing a change in control of Houston and that would operate only with
respect to an extraordinary corporate transaction including Houston or any of
its subsidiaries. However, the Houston Articles of Incorporation and the Houston
Bylaws do contain certain provisions that may have the effect of rendering more
difficult certain possible takeover proposals to acquire control of Houston and
of making removal of management of Houston more difficult. The Houston Articles
of Incorporation provide that the Houston Board of Directors is divided into
three classes serving staggered three-year terms such that approximately
one-third of the Houston Board of Directors is elected each year. The Houston
Bylaws provide that no director may be removed except (a) with cause, as defined
in the Bylaws, by a majority vote of the shareholders, or (b) without cause by
the affirmative vote of 80% of the directors or 80% of the shareholders. The
Houston Bylaws further provide that no person shall be eligible for election or
reelection or to continue to serve as a member of the Houston Board of Directors
if such person is an officer, director, agent, representative, partner,
employee, nominee or affiliate of another public utility company other than
Houston or any of Houston's subsidiaries that is a public utility company. The
Houston Bylaws also provide that they may be amended or repealed, or new Bylaws
may be adopted, only upon the affirmative vote of 80% of the directors or 80% of
the shareholders. The Houston Bylaws also impose certain procedural requirements
on shareholders who wish (i) to make nominations in the election of directors,
(ii) to propose that a director be removed and (iii) to propose any repeal or
change in the Houston Bylaws. The requirements include, among other things, the
timely delivery to Houston's Corporate Secretary of notice of the nomination or
proposal and evidence of (a) the shareholder's status as such, (b) the number of
shares he beneficially owns, (c) a list of the persons with whom the shareholder
is acting in concert and (d) the number of shares such persons beneficially own.
The Houston Bylaws further provide that when nominating directors, the
shareholder must also submit such information with respect to the nominee as
would be required by a proxy statement and certain other information. The
Houston Bylaws provide that failure to follow the required procedures renders
the nominee or proposal ineligible to be voted upon by the shareholders.
 
RIGHTS PLAN
 
   
     On July 11, 1990, the Board of Directors of HI declared a dividend of one
HI Right to purchase preference stock for each outstanding share of HI Common
Stock to shareholders of record at the close of business on August 16, 1990.
Upon consummation of the Transaction, each share of Houston Common Stock
    
 
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<PAGE>   89
 
   
will include one Houston Right, and each Houston Right will entitle the
registered holder to purchase from Houston a unit consisting of one-thousandth
of a share (a "Fractional Share") of Series A Preference Stock, without par
value (the "Series A Preference Stock"), at a purchase price of $42.50 per
Fractional Share, subject to adjustment. The description and terms of the HI
Rights and Houston Rights are set forth in the Rights Agreement dated as of July
11, 1990 between HI and Texas Commerce Bank National Association, as Rights
Agent (the "Rights Agent"), as amended by an amendment thereto dated as of the
Closing Date (the "Rights Agreement").
    
 
   
     DETACHMENT OF RIGHTS; EXERCISABILITY.  The Houston Rights will be attached
to all Houston Common Stock certificates, and no separate Rights Certificates
(as defined in the Rights Agreement) will be distributed initially. The Houston
Rights will separate from the Houston Common Stock and a "Distribution Date"
will occur, with certain exceptions, upon the earlier of (i) ten days following
a public announcement that a person or group of affiliated or associated persons
(an "Acquiring Person") has acquired, or obtained the right to acquire,
beneficial ownership of 20% or more of the outstanding shares of Houston Common
Stock (the date of the announcement being the "Stock Acquisition Date"), or (ii)
ten business days following the commencement of a tender offer or exchange offer
that would result in a person's becoming an Acquiring Person. In certain
circumstances, the Distribution Date may be deferred by the Houston Board of
Directors. Certain inadvertent acquisitions will not result in a person's
becoming an Acquiring Person if the person promptly divests itself of sufficient
Houston Common Stock. Until the Distribution Date (or earlier redemption or
expiration of the Houston Rights), (a) the Houston Rights will be evidenced by
the Houston Common Stock certificates and will be transferred with and only with
such Houston Common Stock certificates, (b) new Houston Common Stock
certificates will contain a notation incorporating the Rights Agreement by
reference and (c) the surrender for transfer of any certificate representing
outstanding shares of Houston Common Stock will also constitute the transfer of
the Rights associated with the Houston Common Stock represented by such
certificate.
    
 
   
     The Houston Rights are not exercisable until the Distribution Date and will
expire at the close of business on July 11, 2000 unless earlier redeemed or
exchanged by Houston as described below.
    
 
   
     As soon as practicable after the Distribution Date, Rights Certificates
will be mailed to holders of record of Houston Common Stock as of the close of
business on the Distribution Date and, from and after the Distribution Date, the
separate Rights Certificates alone will represent the Houston Rights. All shares
of Houston Common Stock issued prior to the Distribution Date will be issued
with Houston Rights. Shares of Houston Common Stock issued after the
Distribution Date in connection with certain employee benefit plans or upon
conversion of certain securities will be issued with Houston Rights. Except as
otherwise determined by the Houston Board of Directors, no other shares of
Houston Common Stock issued after the Distribution Date will be issued with
Houston Rights.
    
 
   
     FLIP-IN.  In the event (a "Flip-In Event") that a person becomes an
Acquiring Person, except pursuant to a tender or exchange offer for all
outstanding shares of Houston Common Stock at a price and on terms that a
majority of the independent directors of Houston determines to be fair to and
otherwise in the best interests of Houston and its shareholders (a "Permitted
Offer"), each holder of a Houston Right will thereafter have the right to
receive, upon exercise of such Houston Right, a number of shares of Houston
Common Stock (or, in certain circumstances, cash, property or other securities
of Houston) having a Current Market Price (as defined in the Rights Agreement)
equal to two times the exercise price of the Houston Right. Notwithstanding the
foregoing, following the occurrence of any Triggering Event, all Houston Rights
that are, or (under certain circumstances specified in the Rights Agreement)
were, beneficially owned by or transferred to an Acquiring Person (or by certain
related parties) will be null and void in the circumstances set forth in the
Rights Agreement.
    
 
     FLIP-OVER.  In the event (a "Flip-Over Event") that, at any time from and
after the time an Acquiring Person becomes such, (i) Houston is acquired in a
merger or other business combination transaction (other than certain mergers
that follow a Permitted Offer), or (ii) 50% or more of Houston's assets or
earning power is sold or transferred, each holder of a Houston Right (except
Houston Rights that are voided as set forth above) shall thereafter have the
right to receive, upon exercise, a number of shares of common stock of the
 
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<PAGE>   90
 
acquiring company having a Current Market Price equal to two times the exercise
price of the Houston Right. Flip-In Events and Flip-Over Events are collectively
referred to as "Triggering Events."
 
   
     SERIES A PREFERENCE STOCK.  After the Distribution Date, each Houston Right
will entitle the holder to purchase a Fractional Share of Series A Preference
Stock, which will be essentially the economic equivalent of one share of Houston
Common Stock.
    
 
   
     ANTIDILUTION.  The number of outstanding Houston Rights associated with a
share of Houston Common Stock, or the number of Fractional Shares of Series A
Preference Stock issuable upon exercise of a Houston Right and the exercise
price, are subject to adjustment in the event of a stock dividend on, or a
subdivision, combination or reclassification of, the Houston Common Stock
occurring prior to the Distribution Date. The exercise price payable, and the
number of Fractional Shares of Series A Preference Stock or other securities or
property issuable, upon exercise of the Houston Rights are subject to adjustment
from time to time to prevent dilution in the event of certain transactions
affecting the Series A Preference Stock.
    
 
   
     With certain exceptions, no adjustment in the exercise price will be
required until cumulative adjustments amount to at least 1% of the exercise
price. No fractional shares of Series A Preference Stock that are not integral
multiples of a Fractional Share are required to be issued and, in lieu thereof,
an adjustment in cash may be made based on the market price of the Series A
Preference Stock on the last trading date prior to the date of exercise.
Pursuant to the Rights Agreement, Houston reserves the right to require prior to
the occurrence of a Triggering Event that, upon any exercise of Houston Rights,
a number of Houston Rights be exercised so that only whole shares of Series A
Preference Stock will be issued.
    
 
   
     REDEMPTION OF RIGHTS.  At any time until the time a person becomes an
Acquiring Person, Houston may redeem the Houston Rights in whole, but not in
part, at a price of $.005 per Houston Right, payable, at the option of Houston,
in cash, shares of Houston Common Stock or such other consideration as the
Houston Board of Directors may determine. Immediately upon the effectiveness of
the action of the Houston Board of Directors ordering redemption of the Houston
Rights, the Houston Rights will terminate and the only right of the holders of
Houston Rights will be to receive the $.005 redemption price.
    
 
   
     EXCHANGE OF RIGHTS.  At any time after the occurrence of a Flip-In Event
and prior to a person's becoming the beneficial owner of 50% or more of the
shares of Houston Common Stock then outstanding or the occurrence of a Flip-Over
Event, Houston may exchange the Houston Rights (other than Houston Rights owned
by an Acquiring Person or an affiliate or an associate of an Acquiring Person,
which will have become void), in whole or in part, at an exchange ratio of one
share of Houston Common Stock, and/or other equity securities deemed to have the
same value as one share of Houston Common Stock, per Houston Right, subject to
adjustment.
    
 
     SUBSTITUTION.  If Houston has an insufficient number of authorized but
unissued shares of Houston Common Stock available to permit an exercise or
exchange of Houston Rights upon the occurrence of a Flip-In Event, it may
substitute certain other types of property for the Houston Common Stock so long
as the total value received by the holder of the Houston Rights is equivalent to
the value of the Houston Common Stock that would otherwise have been received.
Houston may substitute cash, property, equity securities or debt of Houston,
effect a reduction in the exercise price of the Houston Rights or use any
combination of the foregoing.
 
   
     NO RIGHTS AS A SHAREHOLDER; TAXES.  Until a Houston Right is exercised, the
holder thereof, as such, will have no rights as a shareholder of Houston,
including, without limitation, the right to vote or to receive dividends.
Shareholders may, depending upon the circumstances, recognize taxable income in
the event that the Houston Rights become exercisable for Common Stock (or other
consideration) of Houston or for the common stock of the acquiring company or
are exchanged as set forth above.
    
 
   
     AMENDMENT OF TERMS OF RIGHTS.  Other than certain provisions relating to
the principal economic terms of the Houston Rights, any of the provisions of the
Rights Agreement may be amended by the Houston Board of Directors prior to the
time a person becomes an Acquiring Person. Thereafter, the provisions of the
Rights Agreement may be amended by the Board of Directors in order to cure any
ambiguity, defect or inconsistency
    
 
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<PAGE>   91
 
or to make changes that do not materially and adversely affect the interests of
holders of Houston Rights (excluding the interests of any Acquiring Person).
 
   
     RIGHTS AGENT.  Texas Commerce Bank National Association will serve as
Rights Agent with regard to the Houston Rights. Because Houston will serve as
the transfer agent and registrar for the Houston Common Stock, Houston, at the
request of the Rights Agent, has agreed to perform certain ministerial functions
relating to the Houston Rights on behalf of the Rights Agent.
    
 
   
     CERTAIN ANTI-TAKEOVER EFFECTS.  The Houston Rights will have certain
anti-takeover effects. The Houston Rights will cause substantial dilution to any
person or group that attempts to acquire Houston without the approval of the
Houston Board of Directors. As a result, the overall effect of the Houston
Rights may be to render more difficult or discourage any attempt to acquire
Houston even if such acquisition may be favorable to the interests of Houston's
stockholders. Because the Houston Board of Directors can redeem the Houston
Rights or approve a Permitted Offer, the Houston Rights should not interfere
with a merger or other business combination approved by the Houston Board of
Directors.
    
 
   
     RIGHTS AGREEMENT; SUMMARY.  A copy of the Rights Agreement is available
free of charge from HI. This summary description of the Houston Rights does not
purport to be complete and is qualified by reference to the Rights Agreement,
which is incorporated herein by reference.
    
 
                       COMPARATIVE RIGHTS OF STOCKHOLDERS
 
GENERAL
 
   
     As a result of the Transaction (other than pursuant to the Second
Alternative Merger), holders of HI Common Stock will become stockholders of
Houston. If the Second Alternative Merger is consummated in lieu of the Basic
Mergers, such holders will remain stockholders of HI. The terms and provisions
of Houston Common Stock are substantially similar to those of HI Common Stock,
except as otherwise described below in "-- Mergers and Other Fundamental
Transactions" and "-- Amendments to Charter."
    
 
     As a result of the Transaction (other than pursuant to the Second
Alternative Merger), holders of NorAm Common Stock will become stockholders of
Houston and the rights of all such former NorAm stockholders will thereafter be
governed by the Houston Articles of Incorporation, Houston Bylaws and the TBCA.
If the Second Alternative Merger is consummated in lieu of the Basic Mergers,
such holders will remain stockholders of HI. The rights of the holders of NorAm
Common Stock currently are governed by the NorAm Certificate of Incorporation,
the NorAm By-Laws and the DGCL. The following summary, which does not purport to
be a complete statement of the general differences among the rights of the
stockholders of Houston and NorAm, sets forth certain differences between the
Houston Articles of Incorporation and the NorAm Certificate of Incorporation,
the Houston Bylaws and the NorAm By-Laws and the TBCA and the DGCL. This summary
is qualified by reference to the full text of each of such documents and the
TBCA and the DGCL.
 
MERGERS AND OTHER FUNDAMENTAL TRANSACTIONS
 
   
     Texas law generally requires that a merger, consolidation, sale of all or
substantially all of the assets or dissolution of a corporation be approved by
the holders of at least two-thirds of the outstanding shares entitled to vote,
unless the corporation's articles of incorporation provide otherwise. The
Houston Articles of Incorporation, pursuant to Section 2.28D of the TBCA,
provide that such actions may be approved by the affirmative vote of holders of
a majority of the outstanding shares entitled to vote thereon. The Restated
Articles of Incorporation of HI, however, contain no such provision and, thus,
such actions require approval by the affirmative vote of holders of at least
two-thirds of the outstanding shares entitled to vote thereon. Under Delaware
law, all such transactions generally must be approved by the holders of at least
a majority of all outstanding shares entitled to vote, unless the certificate of
incorporation requires approval by a greater number of shares. The NorAm
Certificate of Incorporation provides that certain business combinations
(including mergers and sales of all or substantially all of the assets of NorAm)
involving a beneficial owner of at least 10% of the outstanding shares of
NorAm's capital stock ("Substantial Stockholder") require the
    
 
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<PAGE>   92
 
affirmative vote of the holders of at least 75% of the outstanding shares of
capital stock held by stockholders other than the Substantial Stockholder unless
certain minimum price or board approval requirements are met.
 
MERGERS WITHOUT STOCKHOLDER APPROVAL
 
     Under Article 5.03 of the TBCA, unless the articles of incorporation
otherwise require (the Houston Articles of Incorporation do not require
otherwise), action by the stockholders of a corporation on a plan of merger will
not be required if: (i) the corporation is the sole surviving corporation in the
merger; (ii) the articles of incorporation of the corporation following the
merger will not differ from its articles of incorporation before the merger;
(iii) each stockholder of the corporation prior to the merger will hold the same
number of shares, with identical designations, preferences, limitations and
relative rights, immediately after the merger as it held prior to the merger;
(iv) the voting power of the voting shares outstanding immediately after the
merger, plus the voting power of the voting shares issuable as a result of the
merger, will not exceed by more than 20% the voting power of the voting shares
of the corporation outstanding immediately before the merger; (v) the number of
participating shares outstanding immediately after the merger, will not exceed
by more than 20% the total number of participating shares of the corporation
outstanding immediately before the merger; and (vi) the board of directors of
the corporation adopts a resolution approving the plan of merger. Additionally,
no vote of stockholders is required for the merger of a Texas corporation with a
corporation in which it holds at least 90% of the outstanding shares of each
class and series of such corporation.
 
     Unless the certificate of incorporation otherwise provides (the NorAm
Certificate of Incorporation does not provide otherwise), Delaware law permits a
corporation to consummate a merger in which a corporation is the surviving
corporation without stockholder approval (and stockholders do not have the right
to dissent from the merger and exercise appraisal rights) if (i) the merger does
not result in an amendment to the certificate of incorporation of the
corporation, (ii) each share of stock of the corporation outstanding immediately
prior to the merger is to be an identical outstanding or treasury share of the
surviving corporation after the merger and (iii) the shares of common stock of
the surviving corporation to be issued or delivered under the plan of merger
plus those initially issuable upon conversion of any other shares, securities or
obligations to be issued under such plan do not exceed 20% of the shares of
common stock of the corporation outstanding immediately prior to the merger.
Additionally, when certain conditions are met, no vote of stockholders is
required for the merger of a Delaware corporation with a corporation in which it
holds at least 90% of the outstanding shares of each class of such corporation.
 
APPRAISAL RIGHTS
 
     Article 5.11 of the TBCA provides for appraisal rights in the case of a
plan of merger or exchange or a sale of all or substantially all of the
corporation's assets where stockholder approval is required. No appraisal rights
are available for a plan of merger or plan of exchange if (i) the shares of the
corporation held by the stockholder are listed on a national securities exchange
or held of record by at least 2,000 holders and (ii) the stockholder is not
required to accept any consideration other than (a) shares of a corporation that
will be listed on a national securities exchange or will be held of record by at
least 2,000 holders and (b) cash in lieu of fractional shares.
 
     Section 262 of the DGCL provides for appraisal rights only in the case of a
statutory merger or consolidation of the corporation where the petitioning
stockholder does not consent to the transaction. No appraisal rights are
available where the corporation is to be the surviving corporation and a vote of
its stockholders is not required under Section 251(f) or (g) of the DGCL. There
also are no appraisal rights, unless otherwise provided in a corporation's
certificate of incorporation (the NorAm Certificate of Incorporation does not
provide otherwise), for shares of stock listed on a national securities exchange
or held by more than 2,000 holders of record, unless such stockholders would be
required to accept anything other than (i) shares of stock of the surviving
corporation, (ii) shares of another corporation so listed or held by such number
of holders of record, (iii) cash in lieu of fractional shares of such stock or
(iv) any combination thereof. Unless otherwise provided in the certificate of
incorporation (NorAm's Certificate of Incorporation does not provide otherwise),
under Delaware law stockholders are not entitled to appraisal rights upon a sale
of
 
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<PAGE>   93
 
all or substantially all of the assets of the corporation not made in the usual
and regular course of its business, as they are under Texas law.
 
AMENDMENTS TO CHARTER
 
   
     Article 4.02 of the TBCA provides that an amendment to a corporation's
articles of incorporation must be approved by the board of directors and by the
affirmative vote of holders of at least two-thirds of the outstanding shares
entitled to vote, unless the corporation's articles of incorporation provide
otherwise. The Houston Articles of Incorporation, pursuant to Section 2.28D of
the TBCA, lower the required shareholder vote from at least two-thirds to a
majority of the outstanding shares entitled to vote thereon. The Restated
Articles of Incorporation of HI, however, contain no such provision and, thus,
the requirements of Article 4.02 of the TBCA control. Section 242 of the DGCL
provides that an amendment to a corporation's certificate of incorporation must
be approved by the board of directors and by the affirmative vote of the holders
of at least a majority of the outstanding stock entitled to vote. The NorAm
Certificate of Incorporation provides that amendments to certain provisions
regarding (i) cumulative voting and preemptive rights must be approved by at
least two-thirds of the outstanding shares of capital stock and (ii) business
combinations with a Substantial Stockholder must be approved by the affirmative
vote of holders of at least 75% of the outstanding shares of voting stock of
NorAm and by the affirmative vote of holders of at least 75% of the outstanding
shares of voting stock held by stockholders other than the Substantial
Stockholder.
    
 
   
PREFERENCE STOCK PURCHASE RIGHTS
    
 
     Each share of Houston Common Stock to be issued in connection with the
Transaction will include one Houston Right. Each Houston Right entitles the
registered holder to purchase from Houston a Unit consisting of one-thousandth
of a share of Preference Stock, at a purchase price of $42.50 per Unit, subject
to adjustment. The Houston Right may have the effect of making more difficult
the acquisition of Houston by means of a tender offer, a proxy contest or
otherwise. As long as the Houston Rights are attached to the outstanding Houston
Common Stock, Houston will issue one Houston Right with each new share of
Houston Common Stock that becomes outstanding so that all such shares will have
attached Houston Rights. See "Description of Houston Capital Stock -- Rights
Plan." The NorAm Common Stock has no similar attached rights.
 
SPECIAL MEETINGS OF STOCKHOLDERS
 
     The Houston Bylaws provide that a special meeting of the stockholders may
be called by the Chairman of the Board, the Chief Executive Officer, the
President or the Secretary of Houston, the Houston Board of Directors, the
holders of at least 10% of the shares outstanding and entitled to vote at such
meeting or such other persons as may be authorized by the Houston Articles of
Incorporation. The NorAm Bylaws provide that a special meeting of the
stockholders may be called by the Chairman of the Board, a Vice Chairman of the
Board, the President, the Executive Committee or a majority of the directors of
NorAm, but may not be called by any other person.
 
CUMULATIVE VOTING
 
     Holders of Houston Common Stock will have no right to vote cumulatively in
the election of directors. Holders of NorAm Common Stock are entitled to
cumulative voting rights in such instances.
 
NO PREEMPTIVE RIGHTS
 
     No holder of any class of capital stock of Houston or NorAm has a
preemptive right to subscribe to any or all additional issues of the stock of
Houston or NorAm.
 
STOCKHOLDER ACTION BY WRITTEN CONSENT
 
     Article 9.10 of the TBCA provides that stockholders may act without a
meeting only by the unanimous written consent of all stockholders, unless the
articles of incorporation otherwise provide (the Houston
 
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<PAGE>   94
 
Articles of Incorporation do not provide otherwise). Under Section 228 of the
DGCL, stockholders may, unless otherwise provided in the certificate of
incorporation (the NorAm Certificate of Incorporation does not provide
otherwise), act without a meeting by written consent of holders of outstanding
stock representing the number of shares necessary to take such action at a
meeting at which all shares entitled to vote were present and voted.
 
NEWLY CREATED DIRECTORSHIPS
 
     Under Article 2.34 of the TBCA and the Houston Bylaws, newly created
directorships resulting from any increase in the number of directors may be
filled by the affirmative vote of a majority of the directors then in office for
a term of office continuing only until the next election of one or more
directors by the stockholders entitled to vote thereon, or may be filled by
election at an annual or special meeting of the stockholders called for that
purpose; provided, however, that the board of directors shall not fill more than
two such directorships during the period between two successive annual meetings
of stockholders.
 
     Section 223 of the DGCL provides that vacancies and newly created
directorships may be filled by a majority of the directors then in office (even
though less than a quorum) unless (i) otherwise provided in the certificate of
incorporation or bylaws of the corporation (NorAm's Certificate of Incorporation
and Bylaws do not provide otherwise) or (ii) the certificate of incorporation
directs that a particular class is to elect such director, in which case a
majority of the other directors elected by such class, or a sole remaining
director so elected, shall fill such vacancy (NorAm's Certificate of
Incorporation does not have such a provision).
 
CLASSIFICATION OF THE HOUSTON BOARD OF DIRECTORS
 
     The Houston Articles of Incorporation provide that the number of directors
of the Houston Board of Directors shall be such number as determined from time
to time by a majority of the Houston Board of Directors, but shall not be less
than three. The directors of Houston will be divided into three classes serving
staggered three-year terms such that approximately one-third of the Houston
Board of Directors is elected each year. The NorAm Bylaws provide that the
number of directors of the NorAm Board of Directors shall be as set forth from
time to time by resolution of the NorAm Board of Directors; however, the NorAm
Certificate of Incorporation provides that the number of directors may not be
less than three. The NorAm Board of Directors currently consists of 11
directors, all of one class, and has no staggered terms.
 
REMOVAL OF DIRECTORS
 
     Under Article 2.32 of the TBCA, any director or the entire board of
directors may be removed in accordance with provisions of the corporation's
articles of incorporation or bylaws. The Houston Bylaws provide that no director
of Houston may be removed from office by vote or other action of the
stockholders or otherwise except (a) with cause (as defined in the Houston
Bylaws) by the affirmative vote of the holders of at least a majority of the
voting power of all outstanding shares of capital stock of Houston entitled to
vote in the election of directors, voting together as a single class, or (b)
without cause by (i) the affirmative vote of at least 80% of all directors then
in office at any regular or special meeting of the Houston Board of Directors
called for that purpose or (ii) the affirmative vote of the holders of at least
80% of the voting power of all outstanding shares of capital stock of Houston
entitled to vote in the election of directors, voting together as a single
class.
 
     Under Section 141 of the DGCL, any director or the entire board of
directors may be removed, with or without cause, by the holders of a majority of
the shares entitled to vote at an election of directors, except (i) unless the
certificate of incorporation otherwise provides, in the case of a corporation
having a classified board, stockholders may effect such removal only for cause
and (ii) in the case of a corporation having cumulative voting, if less than the
entire board is to be removed, no director may be removed without cause if the
votes cast against such director's removal would be sufficient to elect such
director if then cumulatively voted at an election of the entire board of
directors. Since the NorAm Certificate of Incorporation provides for cumulative
voting, clause (ii) of the previous sentence would apply to any attempted
removal of a NorAm director.
 
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<PAGE>   95
 
                                    EXPERTS
 
     The financial statements and the related financial statement schedules
included in the joint HI and HL&P Annual Report on Form 10-K for the year ended
December 31, 1995, incorporated herein by reference, have been audited by
Deloitte & Touche LLP, independent auditors, as stated in their reports included
in such Form 10-K, and have been incorporated by reference herein in reliance
upon such reports given upon the authority of that firm as experts in accounting
and auditing.
 
     The consolidated balance sheets of NorAm Energy Corp. as of December 31,
1995 and 1994 and the consolidated statements of income, stockholders' equity
and cash flows for each of the three years in the period ended December 31, 1995
incorporated by reference in the Form 10-K, which is incorporated by reference
in this Joint Proxy Statement/Prospectus, have been incorporated herein in
reliance on the report of Coopers & Lybrand L.L.P., independent accountants,
given on the authority of that firm as experts in accounting and auditing.
 
                                 LEGAL MATTERS
 
   
     Baker & Botts, L.L.P., Houston, Texas, will pass on certain legal matters
in connection with the Transaction, including the validity of the shares of
Houston Common Stock or HI Common Stock, as the case may be, issued in
connection with the Transaction and certain United States federal income
taxation matters, on behalf of HI and HL&P. James A. Baker, III, a senior
partner in the law firm of Baker & Botts, L.L.P., is currently a director of HI
and beneficial owner of 1,500 shares of HI Common Stock. Jones, Day, Reavis &
Pogue, Dallas, Texas, is acting as special counsel for NorAm in connection with
certain legal matters, including certain United States federal income tax
matters, relating to the Transaction and the other transactions contemplated by
the Merger Agreement.
    
 
                             STOCKHOLDER PROPOSALS
 
     Stockholders of HI may submit proposals to be included in HI's proxy
materials and considered for stockholder action at the 1997 HI Annual Meeting of
Shareholders if they do so in accordance with applicable regulations of the SEC.
Any such proposals must be submitted to the Secretary of HI no later than
December 11, 1996 in order to be considered for inclusion in HI's 1997 proxy
materials.
 
     NorAm will not hold a 1997 annual meeting of stockholders unless the
Transaction is not consummated. In the event that such a meeting is held, any
proposals are required to be submitted to the Secretary of NorAm no later than
December 2, 1996 in order to be considered for inclusion in NorAm's 1997 proxy
materials.
 
                                       88
<PAGE>   96
 
   
                                                                      APPENDIX A
    
 
                          AGREEMENT AND PLAN OF MERGER
 
                                     AMONG
 
                        HOUSTON INDUSTRIES INCORPORATED,
 
                       HOUSTON LIGHTING & POWER COMPANY,
 
                                HI MERGER, INC.
 
                                      AND
 
                               NORAM ENERGY CORP.
 
   
                          DATED AS OF AUGUST 11, 1996
    
<PAGE>   97
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                                           PAGE
                                                                                           ----
<S>      <C>  <C>                                                                          <C>
ARTICLE I  THE MERGERS...................................................................    1
  1.1    The Mergers; Effective Time of the Mergers......................................    1
         (a)  The HII/HL&P Merger........................................................    1
         (b)  The NorAm Merger...........................................................    2
  1.2    Closing.........................................................................    2
  1.3    Effects of the HII/HL&P Merger..................................................    2
  1.4    Effects of the NorAm Merger.....................................................    3
ARTICLE II EFFECT OF THE MERGERS ON THE CAPITAL STOCK OF THE CONSTITUENT CORPORATIONS;
           EXCHANGE OF CERTIFICATES......................................................    3
  2.1    Effect of HII/HL&P Merger on Capital Stock......................................    3
         (a)  Cancellation of HL&P Common Stock..........................................    3
         (b)  Cancellation of Treasury Stock and HL&P-Owned Stock........................    3
         (c)  Exchange of HII Common Stock...............................................    4
         (d)  Treatment of HII Stock Options.............................................    4
         (e)  HL&P Preferred Stock Unchanged.............................................    4
  2.2    Effect of NorAm Merger on Capital Stock.........................................    4
         (a)  Merger Sub Capital Stock Unchanged.........................................    4
         (b)  Cancellation of Treasury Stock and HL&P-Owned Stock........................    4
         (c)  Exchange Ratio for NorAm Common Stock......................................    4
         (d)  NorAm Dissenting Shares....................................................    5
         (e)  Treatment of NorAm Stock Options...........................................    6
         (f)  NorAm Convertible Debentures...............................................    6
         (g)  NorAm Convertible Junior Debentures........................................    6
  2.3    Exchange of Certificates........................................................    7
         (a)  Exchange of HII Common Stock...............................................    7
         (b)  Exchange Agent.............................................................    7
         (c)  Exchange Procedures........................................................    7
         (d)  Distributions with Respect to Unexchanged Shares...........................    8
         (e)  No Further Ownership Rights in NorAm Common Stock..........................    8
         (f)  No Fractional Shares.......................................................    8
         (g)  Termination of Exchange Agent..............................................    9
         (h)  No Liability...............................................................    9
  2.4    Allocation of Merger Consideration; Election Procedures.........................    9
         (a)  Allocation.................................................................    9
         (b)  Election...................................................................   10
         (c)  Procedure for Elections....................................................   10
         (d)  Revocation of Election; Return of Certificates.............................   10
         (e)  Proration of Cash Election Shares..........................................   11
         (f)  Proration of Stock Election Shares.........................................   11
         (g)  No Proration...............................................................   11
         (h)  Computations...............................................................   11
ARTICLE III  REPRESENTATIONS AND WARRANTIES..............................................   11
  3.1    Representations and Warranties of NorAm.........................................   11
         (a)  Organization, Standing and Power...........................................   11
         (b)  Capital Structure..........................................................   12
         (c)  Authority; No Violations; Consents and Approvals...........................   13
         (d)  SEC Documents..............................................................   14
         (e)  Information Supplied.......................................................   14
</TABLE>
 
                                        i
<PAGE>   98
 
<TABLE>
<CAPTION>
                                                                                           PAGE
                                                                                           ----
<S>      <C>  <C>                                                                          <C>
         (f)  Absence of Certain Changes or Events.......................................   15
         (g)  No Undisclosed Material Liabilities........................................   15
         (h)  No Default.................................................................   15
         (i)  Compliance with Applicable Laws............................................   15
         (j)  Litigation.................................................................   16
         (k)  Taxes......................................................................   16
         (l)  Employee Matters; ERISA....................................................   17
         (m)  Labor Matters..............................................................   21
         (n)  Intangible Property........................................................   21
         (o)  Environmental Matters......................................................   22
         (p)  Insurance..................................................................   24
         (q)  Contracts..................................................................   24
         (r)  Regulatory Proceedings.....................................................   24
         (s)  Regulation as a Utility....................................................   24
         (t)  Opinion of Financial Advisor...............................................   25
         (u)  Vote Required..............................................................   25
         (v)  Beneficial Ownership of HII Common Stock...................................   25
         (w)  Brokers....................................................................   25
         (x)  Article Fifth of NorAm Restated Certificate of Incorporation and Section
                203 of
              the DGCL Not Applicable....................................................   25
         (y)  Change in Control Provisions...............................................   25
  3.2    Representations and Warranties of HL&P and HII..................................   25
         (a)  Organization, Standing and Power...........................................   25
         (b)  Capital Structure..........................................................   25
         (c)  Authority; No Violations; Consents and Approvals...........................   27
         (d)  SEC Documents..............................................................   28
         (e)  Information Supplied.......................................................   28
         (f)  Absence of Certain Changes or Events.......................................   29
         (g)  No Undisclosed Material Liabilities........................................   29
         (h)  No Default.................................................................   29
         (i)  Compliance with Applicable Laws............................................   29
         (j)  Litigation.................................................................   29
         (k)  Taxes......................................................................   30
         (l)  Employee Matters; ERISA....................................................   30
         (m)  Labor Matters..............................................................   33
         (n)  Intangible Property........................................................   34
         (o)  Environmental Matters......................................................   34
         (p)  Regulation as a Utility....................................................   35
         (q)  Opinion of Financial Advisor...............................................   35
         (r)  Vote Required..............................................................   35
         (s)  Beneficial Ownership of NorAm Common Stock.................................   36
         (t)  Brokers....................................................................   36
         (u)  Financing..................................................................   36
         (v)  Insurance..................................................................   36
         (w)  Regulatory Proceedings.....................................................   36
         (x)  Representations with Respect to Merger Sub.................................   36
ARTICLE IV  CONDUCT OF BUSINESS PENDING THE MERGERS......................................   36
  4.1    Conduct of Business by NorAm Pending the Mergers................................   36
         (a)  Ordinary Course............................................................   36
         (b)  Dividends; Changes in Stock................................................   37
         (c)  Issuance of Securities.....................................................   37
</TABLE>
 
                                       ii
<PAGE>   99
 
<TABLE>
<CAPTION>
                                                                                           PAGE
                                                                                           ----
<S>      <C>  <C>                                                                          <C>
         (d)  Governing Documents........................................................   37
         (e)  No Acquisitions............................................................   37
         (f)  No Dispositions............................................................   37
         (g)  No Dissolution, Etc........................................................   37
         (h)  Certain Employee Matters...................................................   38
         (i)  Indebtedness; Leases; Capital Expenditures.................................   38
         (j)  Accounting.................................................................   38
         (k)  Affiliate Transactions.....................................................   38
         (l)  Rate Matters...............................................................   39
         (m)  Contracts..................................................................   39
         (n)  Insurance..................................................................   39
         (o)  Permits....................................................................   39
         (p)  Tax Matters................................................................   39
         (q)  Discharge of Liabilities...................................................   39
         (r)  Other Actions..............................................................   39
         (s)  Agreements.................................................................   39
  4.2    Certain Restrictions in Respect of HII and HL&P.................................   39
         (a)  Dividends; Changes in Stock................................................   40
         (b)  Governing Documents........................................................   40
         (c)  Insurance..................................................................   40
         (d)  Permits....................................................................   40
         (e)  Certain Acquisitions.......................................................   40
         (f)  Other Actions..............................................................   40
         (g)  Agreements.................................................................   40
  4.3    No Solicitation.................................................................   40
ARTICLE V  ADDITIONAL AGREEMENTS.........................................................   41
  5.1    Preparation of S-4 and the Joint Proxy Statement................................   41
  5.2    Letter of NorAm's Accountants...................................................   41
  5.3    Letter of HII's Accountants.....................................................   42
  5.4    Access to Information...........................................................   42
  5.5    NorAm Stockholders' Meeting.....................................................   42
  5.6    HII Shareholders' Meeting.......................................................   42
  5.7    Regulatory and Other Approvals..................................................   42
         (a)  HSR Act....................................................................   42
         (b)  Other Regulatory Approvals.................................................   43
         (c)  Other Approvals............................................................   43
  5.8    Agreements of Others............................................................   43
  5.9    Authorization for Shares and Stock Exchange Listing.............................   43
  5.10   Employee Matters................................................................   43
  5.11   Stock Options...................................................................   45
  5.12   Indemnification; Directors' and Officers' Insurance.............................   46
  5.13   Compliance with WARN Act........................................................   47
  5.14   Agreement to Defend.............................................................   47
  5.15   Public Announcements............................................................   47
  5.16   Other Actions...................................................................   47
  5.17   Advice of Changes; SEC Filings..................................................   47
  5.18   Reorganization..................................................................   48
  5.19   HII/HL&P Merger Surviving Corporation Board of Directors........................   48
  5.20   Execution of Supplemental Indentures............................................   48
  5.21   Disclosure Schedules............................................................   48
  5.22   Fairness Opinions Not Withdrawn.................................................   48
</TABLE>
 
                                       iii
<PAGE>   100
 
<TABLE>
<CAPTION>
                                                                                           PAGE
                                                                                           ----
<S>      <C>  <C>                                                                          <C>
ARTICLE VI  CONDITIONS PRECEDENT.........................................................   48
  6.1    Conditions to Each Party's Obligation to Effect the Merger......................   48
         (a)  NorAm Stockholder Approval.................................................   48
         (b)  HII Shareholder Approval...................................................   48
         (c)  NYSE Listing...............................................................   48
         (d)  Other Approvals............................................................   49
         (e)  S-4........................................................................   49
         (f)  No Injunctions or Restraints...............................................   49
  6.2    Conditions of Obligations of HII, HL&P and Merger Sub...........................   49
         (a)  Representations and Warranties.............................................   49
         (b)  Performance of Obligations of NorAm........................................   49
         (c)  Letters from Rule 145 Affiliates...........................................   49
         (d)  Number of NorAm Dissenting Shares..........................................   49
         (e)  Tax Opinion................................................................   49
         (f)  No Material Limitations or Restraints......................................   50
         (g)  NorAm Required Consents....................................................   50
  6.3    Conditions of Obligations of NorAm..............................................   50
         (a)  Representations and Warranties.............................................   50
         (b) Performance of Obligations of HII, HL&P and Merger Sub......................
                                                                                            50
         (c) Tax Opinion.................................................................
                                                                                            50
         (d) HII Required Consents.......................................................
                                                                                            50
ARTICLE VII  TERMINATION AND AMENDMENT...................................................   51
  7.1    Termination.....................................................................   51
  7.2    Effect of Termination...........................................................   52
  7.3    Expenses........................................................................   53
  7.4    Amendment.......................................................................   53
  7.5    Extension; Waiver...............................................................   53
ARTICLE VIII  ALTERNATIVE MERGER.........................................................   53
  8.1    Alternative Merger..............................................................   53
  8.2    Effects of the Alternative Merger...............................................   54
  8.3    Effect of the Alternative Merger on the Capital Stock of the Alternative Merger
         Constituent Corporations; Exchange of Certificates..............................   54
  8.4    Amendment to This Agreement.....................................................   55
  8.5    The Second Alternative Merger...................................................   55
  8.6    Effects of the Second Alternative Merger........................................   55
  8.7    Effect of the Second Alternative Merger on the Capital Stock of the Second
         Alternative Merger Constituent Corporations; Exchange of Certificates...........   56
  8.8    Amendment to This Agreement.....................................................   56
ARTICLE IX  GENERAL PROVISIONS...........................................................   56
  9.1    Payment of Expenses.............................................................   56
  9.2    Nonsurvival of Representations, Warranties and Agreements.......................   56
  9.3    Notices.........................................................................   56
  9.4    Interpretation..................................................................   57
  9.5    Counterparts....................................................................   57
  9.6    Entire Agreement; No Third Party Beneficiaries..................................   57
  9.7    Governing Law...................................................................   58
  9.8    No Remedy in Certain Circumstances..............................................   58
  9.9    Assignment......................................................................   58
</TABLE>
 
                                       iv
<PAGE>   101
 
                           GLOSSARY OF DEFINED TERMS
 
<TABLE>
<CAPTION>
                                 DEFINED TERM                                  DEFINED IN SECTION
- ------------------------------------------------------------------------------ ------------------
<S>                                                                            <C>
1935 Act...................................................................... 3.1(s)(i)
Acquisition Proposal.......................................................... 4.3(e)
Affiliate..................................................................... 4.1(k)
Agreement..................................................................... Preamble
Alternative Merger............................................................ Recitals
Alternative Merger Articles of Merger......................................... 8.1(b)
Alternative Merger Certificate of Merger...................................... 8.1(b)
Alternative Merger Constituent Corporations................................... 8.2(a)
Alternative Merger Effective Time............................................. 8.1(b)
Alternative Merger Surviving Corporation...................................... 8.2(a)
Average Price................................................................. 2.2(c)(ii)
Cash Consideration............................................................ 2.2(c)(i)
Cash Election................................................................. 2.4(b)
Cash Election Number.......................................................... 2.4(a)
Cash Election Shares.......................................................... 2.4(e)
Certificates.................................................................. 2.3(c)
Closing....................................................................... 1.1(a)
Closing Date.................................................................. 1.2
Code.......................................................................... Recitals
Confidentiality Agreements.................................................... 5.4
CS First Boston............................................................... 3.2(q)
Cycle X Awards................................................................ 5.10(d)
DGCL.......................................................................... 1.1(b)
Disclosure Schedules.......................................................... 5.21
Effective Time................................................................ 1.1(b)
Election Deadline............................................................. 2.4(c)
Environmental Claims.......................................................... 3.1(o)(i)(A)
Environmental Laws............................................................ 3.1(o)(i)(B)
Environmental Permits......................................................... 3.1(o)(iii)
ERISA......................................................................... 3.1(l)(i)(D)
Excess Securities............................................................. 2.3(f)
Exchange Act.................................................................. 3.1(c)(iii)
Exchange Agent................................................................ 2.3(b)
Exchange Fund................................................................. 2.3(b)
FERC.......................................................................... 3.1(c)(iii)
Form of Election.............................................................. 2.4(c)
Fractional Dividends.......................................................... 2.3(f)
GAAP.......................................................................... 3.1(d)
Governmental Entity........................................................... 3.1(c)(iii)
Hazardous Materials........................................................... 3.1(o)(i)(C)
HII........................................................................... Preamble
HII Affiliate................................................................. 3.2(l)(i)
HII Benefit Plan.............................................................. 3.2(l)(i)
HII Common Stock.............................................................. 2.1
HII Common Stock Repurchase Program........................................... 3.2(f)
HII Disclosure Schedule....................................................... 3.2
HII/HL&P Merger............................................................... Recitals
HII/HL&P Merger Articles of Merger............................................ 1.1(a)
HII/HL&P Merger Certificate of Merger......................................... 1.1(a)
</TABLE>
 
                                        v
<PAGE>   102
 
<TABLE>
<CAPTION>
                                 DEFINED TERM                                  DEFINED IN SECTION
- ------------------------------------------------------------------------------ ------------------
<S>                                                                            <C>
HII/HL&P Merger Constituent Corporations...................................... 1.3(a)
HII/HL&P Merger Effective Time................................................ 1.1(a)
HII/HL&P Merger Surviving Corporation......................................... 1.3(a)
HII Intangible Property....................................................... 3.2(n)
HII Litigation................................................................ 3.2(j)
HII Order..................................................................... 3.2(j)
HII Pension Benefit Plan...................................................... 3.2(l)(ii)
HII Permits................................................................... 3.2(i)
HII Preferred Stock........................................................... 3.2(b)(ii)
HII Required Consents......................................................... 3.2(c)(ii)
HII SEC Documents............................................................. 3.2(d)
HII Series A Preference Stock................................................. 2.1(b)
HII Shareholders' Meeting..................................................... 5.6
HII Stock Option.............................................................. 2.1(d)
HII Stock Plans............................................................... 3.2(b)(ii)
HII Stock Purchase Right...................................................... 2.1(b)
HII Vote Matter............................................................... 3.2(c)(i)
HL&P.......................................................................... Preamble
HL&P Class A Common Stock..................................................... 2.1(a)
HL&P Class B Common Stock..................................................... 2.1(a)
HL&P Common Stock............................................................. 2.1(c)
HL&P Preferred Stock.......................................................... 3.2(b)(i)
HL&P Rights Agreement......................................................... 2.1(c)
HL&P SEC Documents............................................................ 3.2(d)
HL&P Series A Preferred Stock................................................. 2.1(c)
HL&P Stock Purchase Rights.................................................... 2.1(c)
HSR Act....................................................................... 3.1(c)(iii)
Indemnified Liabilities....................................................... 5.12(a)
Indemnified Parties........................................................... 5.12(a)
Initial Termination Date...................................................... 7.1(c)
Injunction.................................................................... 6.1(f)
IRS........................................................................... 3.1(k)(ii)
Joint Proxy Statement......................................................... 3.1(c)(iii)
Material Adverse Change....................................................... 3.1(a)
Material Adverse Effect....................................................... 3.1(a)
Merger Consideration.......................................................... 2.2(c)
Merger Sub.................................................................... Preamble
Mergers....................................................................... Recitals
Merrill Lynch................................................................. 3.1(t)
Non-Election.................................................................. 2.4(b)
Non-Election Shares........................................................... 2.4(b)
NorAm......................................................................... Preamble
NorAm 10% Debentures.......................................................... 3.1(y)
NorAm Affiliate............................................................... 3.1(l)(i)(A)
NorAm Benefit Plan............................................................ 3.1(l)(i)(B)
NorAm Common Stock............................................................ 2.2
NorAm Convertible Debentures.................................................. 2.2(f)
NorAm Convertible Junior Debentures........................................... 2.2(g)
NorAm Disclosure Schedule..................................................... 3.1
NorAm Dissenting Shares....................................................... 2.2(d)
NorAm Incentive Plan.......................................................... 5.10(d)
</TABLE>
 
                                       vi
<PAGE>   103
 
<TABLE>
<CAPTION>
                                 DEFINED TERM                                  DEFINED IN SECTION
- ------------------------------------------------------------------------------ ------------------
<S>                                                                            <C>
NorAm Intangible Property..................................................... 3.1(n)
NorAm Litigation.............................................................. 3.1(j)
NorAm Merger.................................................................. Recitals
NorAm Merger Certificate of Merger............................................ 1.1(b)
NorAm Merger Constituent Corporations......................................... 1.4(a)
NorAm Merger Effective Time................................................... 1.1(b)
NorAm Merger Surviving Corporation............................................ 1.4(a)
NorAm Order................................................................... 3.1(j)
NorAm Pension Benefit Plan.................................................... 3.1(l)(i)(C)
NorAm Permits................................................................. 3.1(i)
NorAm Preferred Stock......................................................... 3.1(b)
NorAm Rabbi Trusts............................................................ 5.10(g)
NorAm Representatives......................................................... 4.3(a)
NorAm Required Consents....................................................... 3.1(c)(ii)
NorAm SEC Documents........................................................... 3.1(d)
NorAm Stock Option............................................................ 2.2(e)(i)
NorAm Stock Option Election Form.............................................. 2.2(e)(i)
NorAm Stock Option Election Period............................................ 2.2(e)(i)
NorAm Stock Plans............................................................. 3.1(b)
NorAm Stockholders' Meeting................................................... 5.5
NYSE.......................................................................... 2.2(c)(ii)
PBGC.......................................................................... 3.1(l)(i)(E)
Release....................................................................... 3.1(o)(i)(D)
Reportable Event.............................................................. 3.1(l)(i)(F)
Returns....................................................................... 3.1(k)(i)
Rule 145 Affiliates........................................................... 5.8
S-4........................................................................... 3.1(e)
SEC........................................................................... 3.1(a)
Second Alternative Merger..................................................... Recitals
Second Alternative Merger Certificate of Merger............................... 8.5(b)
Second Alternative Merger Constituent Corporations............................ 8.6(a)
Second Alternative Merger Effective Time...................................... 8.5(b)
Second Alternative Merger Surviving Corporation............................... 8.6(a)
Section 5.10(b) Plans......................................................... 5.10(b)
Securities Act................................................................ 3.1(d)
Significant Subsidiary........................................................ 3.1(a)
Spread........................................................................ 2.2(e)(ii)
Stock Consideration........................................................... 2.2(c)(ii)
Stock Election................................................................ 2.4(b)
Stock Election Number......................................................... 2.4(a)
Stock Election Shares......................................................... 2.4(e)
Subsidiary.................................................................... 2.1(b)
Taxes......................................................................... 3.1(k)
TBCA.......................................................................... 1.1(a)
Trading Day................................................................... 2.2(c)(ii)
Voting Debt................................................................... 3.1(b)
WARN.......................................................................... 5.13
</TABLE>
 
                                       vii
<PAGE>   104
 
   
                          AGREEMENT AND PLAN OF MERGER
    
 
     AGREEMENT AND PLAN OF MERGER, dated as of August 11, 1996 (this
"Agreement"), by and among Houston Industries Incorporated, a Texas corporation
("HII"), Houston Lighting & Power Company, a Texas corporation and a wholly
owned subsidiary of HII ("HL&P"), HI Merger, Inc., a Delaware corporation and a
direct wholly owned subsidiary of HII ("Merger Sub"), and NorAm Energy Corp., a
Delaware corporation ("NorAm").
 
     WHEREAS, HII and NorAm have determined to engage in a strategic business
combination;
 
     WHEREAS, in furtherance thereof, the respective Boards of Directors of HII,
HL&P, Merger Sub and NorAm have approved this Agreement and the merger of NorAm
with and into Merger Sub, with Merger Sub being the surviving corporation (the
"NorAm Merger"), and the respective Boards of Directors of HII and HL&P have
approved the merger of HII with and into HL&P, with HL&P being the surviving
corporation (the "HII/HL&P Merger," and together with the NorAm Merger, the
"Mergers"), which merger would occur immediately prior to the NorAm Merger;
 
     WHEREAS, the respective Boards of Directors of HII, HL&P, Merger Sub and
NorAm (i) have approved, but only in the circumstances set forth in Section 8.1
and then in lieu of the Mergers, the merger of NorAm and HII with and into HL&P,
with HL&P being the surviving corporation (the "Alternative Merger") and (ii)
have approved, but only in the circumstances set forth in Section 8.5 and then
in lieu of the Mergers, the merger of NorAm with and into Merger Sub, with
Merger Sub being the surviving corporation (the "Second Alternative Merger");
 
     WHEREAS, the respective Boards of Directors of HII, HL&P, Merger Sub and
NorAm have determined that it is in the best interests of their respective
stockholders for the Mergers (or, if applicable, the Alternative Merger or the
Second Alternative Merger) to be effected upon the terms and subject to the
conditions of this Agreement;
 
     WHEREAS, for federal income tax purposes, it is intended that each of the
HII/HL&P Merger and the NorAm Merger (or if applicable, the Alternative Merger
or the Second Alternative Merger) shall qualify as a reorganization within the
meaning of Section 368(a) of the Internal Revenue Code of 1986, as amended (the
"Code"), and this Agreement is intended to be and is adopted as a plan of
reorganization within the meaning of Section 368(b) of the Code; and
 
     WHEREAS, HII, HL&P, Merger Sub and NorAm desire to make certain
representations, warranties, covenants and agreements in connection with the
Mergers (or, if applicable, the Alternative Merger or the Second Alternative
Merger) and also to prescribe various conditions to the Mergers (or, if
applicable, the Alternative Merger or the Second Alternative Merger);
 
     NOW, THEREFORE, in consideration of the foregoing and the representations,
warranties, covenants and agreements herein contained, the parties hereto agree
as follows:
 
                                   ARTICLE I
 
                                  THE MERGERS
 
     1.1  The Mergers; Effective Time of the Mergers. Upon the terms and subject
to the conditions of this Agreement:
 
          (a) The HII/HL&P Merger. At the HII/HL&P Merger Effective Time (as
     hereinafter defined), HII shall be merged with and into HL&P in accordance
     with the Texas Business Corporation Act (the "TBCA"). As soon as
     practicable at or after the closing of the Mergers (the "Closing"),
     articles of merger, prepared and executed in accordance with the relevant
     provisions of the TBCA, with respect to the HII/HL&P Merger (the "HII/HL&P
     Merger Articles of Merger") shall be filed with the Secretary of State of
     the State of Texas. The HII/HL&P Merger Articles of Merger shall state that
     the HII/HL&P Merger is to become effective immediately upon filing of the
     HII/HL&P Merger Articles of Merger with the Secretary of State of the State
     of Texas or, if agreed to by HII, HL&P and NorAm, at
 
                                        1
<PAGE>   105
 
     such time thereafter as is provided in the HII/HL&P Merger Articles of
     Merger. The HII/HL&P Merger shall become effective at the time of the
     issuance of the certificate of merger with respect to the HII/HL&P Merger
     (the "HII/HL&P Merger Certificate of Merger") by the Secretary of State of
     the State of Texas or, if a later effective time was provided in the
     HII/HL&P Merger Articles of Merger, such later time (the "HII/HL&P Merger
     Effective Time").
 
          (b) The NorAm Merger. At the NorAm Merger Effective Time (as
     hereinafter defined), NorAm shall be merged with and into Merger Sub in
     accordance with the Delaware General Corporation Law (the "DGCL"). As soon
     as practicable at or after the Closing, a certificate of merger, prepared
     and executed in accordance with the relevant provisions of the DGCL, with
     respect to the NorAm Merger (the "NorAm Merger Certificate of Merger")
     shall be filed with the Secretary of State of the State of Delaware. The
     NorAm Merger Certificate of Merger shall state that the NorAm Merger shall
     become effective immediately following the HII/HL&P Merger Effective Time
     or, if agreed to by HL&P, Merger Sub and NorAm, at such time thereafter as
     is provided in the NorAm Merger Certificate of Merger. The NorAm Merger
     shall become effective at the time that the NorAm Merger Certificate of
     Merger shall be duly filed with the Secretary of State of the State of
     Delaware or, if a later effective time was provided in the NorAm Merger
     Certificate of Merger, such later time (the "NorAm Merger Effective Time"
     or the "Effective Time"). The effective time specified in the HII/HL&P
     Merger Articles of Merger shall be prior to the effective time specified in
     the NorAm Merger Certificate of Merger.
 
     1.2  Closing. The Closing shall take place at 10:00 a.m. on a date to be
specified by the parties, which shall be no later than the fifth business day
after satisfaction (or waiver in accordance with this Agreement) of the latest
to occur of the conditions set forth in Article VI (the "Closing Date"), at the
offices of Baker & Botts, L.L.P., 910 Louisiana, Houston, Texas 77002, unless
another date or place is agreed to in writing by the parties.
 
     1.3  Effects of the HII/HL&P Merger.
 
          (a) At the HII/HL&P Merger Effective Time: (i) HII shall be merged
     with and into HL&P, the separate existence of HII shall cease and HL&P
     shall continue as the surviving corporation (HII and HL&P are sometimes
     referred to herein as the "HII/HL&P Merger Constituent Corporations" and
     HL&P is sometimes referred to herein as the "HII/HL&P Merger Surviving
     Corporation"); (ii) Article I and Article VI of the Restated Articles of
     Incorporation of HL&P shall be amended as set forth in Exhibit A hereto
     and, as so amended, such Restated Articles of Incorporation shall be the
     Articles of Incorporation of the HII/HL&P Merger Surviving Corporation; and
     (iii) the Bylaws of HII as in effect immediately prior to the HII/HL&P
     Merger Effective Time shall be the Bylaws of the HII/HL&P Merger Surviving
     Corporation.
 
          (b) The directors and officers of HII at the HII/HL&P Merger Effective
     Time shall, from and after the HII/HL&P Merger Effective Time, be the
     initial directors and officers of the HII/HL&P Merger Surviving Corporation
     and shall serve until their successors have been duly elected or appointed
     and qualified or until their earlier death, resignation or removal in
     accordance with the HII/HL&P Merger Surviving Corporation's Articles of
     Incorporation and Bylaws. Each officer of HL&P at the HII/HL&P Merger
     Effective Time shall, from and after the HII/HL&P Merger Effective Time,
     hold the same office at the Houston Lighting & Power Company Division of
     the HII/HL&P Merger Surviving Corporation as held at HL&P immediately prior
     to the HII/HL&P Merger Effective Time and shall serve in such office until
     his or her successor has been duly appointed and qualified or until his or
     her earlier death, resignation or removal in accordance with the HII/HL&P
     Merger Surviving Corporation's Articles of Incorporation and Bylaws.
 
          (c) The HII/HL&P Merger shall have the effects set forth in this
     Section 1.3 and the applicable provisions of the TBCA.
 
                                        2
<PAGE>   106
 
     1.4  Effects of the NorAm Merger.
 
          (a) At the NorAm Merger Effective Time: (i) NorAm shall be merged with
     and into Merger Sub, the separate existence of NorAm shall cease and Merger
     Sub shall continue as the surviving corporation (Merger Sub and NorAm are
     sometimes referred to herein as the "NorAm Merger Constituent Corporations"
     and Merger Sub is sometimes referred to herein as the "NorAm Merger
     Surviving Corporation"); (ii) the Certificate of Incorporation of Merger
     Sub shall be amended to change the name of Merger Sub to "NorAm Energy
     Corp.," and, as so amended, such Certificate of Incorporation shall be the
     Certificate of Incorporation of the NorAm Merger Surviving Corporation; and
     (iii) the Bylaws of Merger Sub as in effect immediately prior to the NorAm
     Merger Effective Time shall be the Bylaws of the NorAm Merger Surviving
     Corporation.
 
          (b) The directors of Merger Sub at the NorAm Merger Effective Time
     shall, from and after the NorAm Merger Effective Time, be the initial
     directors of the NorAm Merger Surviving Corporation and the officers of
     NorAm at the NorAm Merger Effective Time shall, from and after the NorAm
     Merger Effective Time, be the initial officers of the NorAm Merger
     Surviving Corporation, and such directors and officers shall serve until
     their successors have been duly elected or appointed and qualified or until
     their earlier death, resignation or removal in accordance with the NorAm
     Merger Surviving Corporation's Certificate of Incorporation and Bylaws.
 
          (c) The NorAm Merger shall have the effects set forth in this Section
     1.4 and the applicable provisions of the DGCL.
 
                                   ARTICLE II
 
               EFFECT OF THE MERGERS ON THE CAPITAL STOCK OF THE
               CONSTITUENT CORPORATIONS; EXCHANGE OF CERTIFICATES
 
     2.1  Effect of HII/HL&P Merger on Capital Stock. At the HII/HL&P Merger
Effective Time, by virtue of the HII/HL&P Merger and without any action on the
part of the holder of any shares of common stock, no par value, of HII ("HII
Common Stock") or capital stock of HL&P:
 
          (a) Cancellation of HL&P Common Stock. Each issued and outstanding
     share of common stock, Class A, no par value, of HL&P ("HL&P Class A Common
     Stock") and each issued and outstanding share of common stock, Class B, no
     par value, of HL&P ("HL&P Class B Common Stock") that is owned directly or
     indirectly by HII shall be canceled and retired and shall cease to exist
     and no stock of HL&P or other consideration shall be delivered or
     deliverable in exchange therefor.
 
          (b) Cancellation of Treasury Stock and HL&P-Owned Stock. Each share of
     HII Common Stock and each associated right (a "HII Stock Purchase Right")
     to purchase one two-hundredth of a share of Series A Preference Stock, no
     par value, of HII ("HII Series A Preference Stock"), and all other shares
     of capital stock of HII that are owned by HII as treasury stock and any
     shares of HII Common Stock and all other shares of capital stock of HII
     owned by HL&P, Merger Sub or any other wholly owned Subsidiary (as
     hereinafter defined) of HL&P or HII shall be canceled and retired and shall
     cease to exist and no stock of HL&P or other consideration shall be
     delivered or deliverable in exchange therefor. All references in this
     Agreement to HII Common Stock shall be deemed to include the associated HII
     Stock Purchase Right. As used in this Agreement, the word "Subsidiary"
     means, with respect to any party, any corporation or other organization,
     whether incorporated or unincorporated, of which: (i) such party or any
     other Subsidiary of such party is a general partner (excluding
     partnerships, the general partnership interests of which are held by such
     party or any Subsidiary of such party that do not have a majority of the
     voting interest in such partnership); or (ii) at least a majority of the
     securities or other interests having by their terms ordinary voting power
     to elect a majority of the Board of Directors or others performing similar
     functions with respect to such corporation or other organization is,
     directly or indirectly, owned or controlled by such party or by any one or
     more of its Subsidiaries, or by such party and any one or more of its
     Subsidiaries.
 
                                        3
<PAGE>   107
 
   
          (c) Exchange of HII Common Stock. Each share of HII Common Stock
     issued and outstanding immediately prior to the HII/HL&P Merger Effective
     Time (other than shares to be canceled in accordance with Section 2.1(b))
     shall be converted into one share of common stock, no par value, of
     HII/HL&P Merger Surviving Corporation ("HL&P Common Stock"), together with
     the corresponding number of associated rights ("HL&P Stock Purchase
     Rights") to purchase one one-hundredth of a share of Series A Junior
     Preferred Stock, without par value, of HII/HL&P Merger Surviving
     Corporation ("HL&P Series A Preferred Stock") pursuant to an Amended and
     Restated Rights Agreement among HII, HL&P and Texas Commerce Bank National
     Association, as Rights Agent (the "HL&P Rights Agreement"). The HII Rights
     Agreement shall be amended and restated to become the HL&P Rights Agreement
     and shall provide for (i) the HII Stock Purchase Rights to be converted
     into HL&P Stock Purchase Rights and (ii) the HL&P Stock Purchase Rights to
     attach to shares of HL&P Common Stock issued as consideration in the NorAm
     Merger, and to make such other changes as HL&P determines are appropriate.
     All references in this Agreement to the HL&P Common Stock to be received
     pursuant to the Mergers shall be deemed to include the associated HL&P
     Stock Purchase Rights. All such shares of HII Common Stock, when so
     converted, shall no longer be outstanding and shall automatically be
     canceled and retired and shall cease to exist, and each holder of a
     certificate representing any such shares shall cease to have any rights
     with respect thereto, except the right to receive the shares of HL&P Common
     Stock.
    
 
          (d) Treatment of HII Stock Options. Each unexpired option to purchase
     HII Common Stock issued by HII that is outstanding at the HII/HL&P Merger
     Effective Time (a "HII Stock Option"), whether or not exercisable, shall
     automatically and without any action on the part of the holder thereof be
     converted into an option to purchase the number of shares of HL&P Common
     Stock equal to the number of shares of HII Common Stock that could be
     purchased under such HII Stock Option at a price per share of HL&P Common
     Stock equal to the per share exercise price of such HII Stock Option.
 
          (e) HL&P Preferred Stock Unchanged. Each issued and outstanding share
     of cumulative preferred stock, no par value, of HL&P shall not be converted
     or otherwise affected by the HII/HL&P Merger and shall remain outstanding
     after the HII/HL&P Merger.
 
     2.2  Effect of NorAm Merger on Capital Stock. At the NorAm Merger Effective
Time, by virtue of the NorAm Merger and without any action on the part of the
holder of any shares of common stock, par value $.625 per share, of NorAm
("NorAm Common Stock") or capital stock of Merger Sub:
 
          (a) Merger Sub Capital Stock Unchanged. Each issued and outstanding
     share of the capital stock of Merger Sub shall not be converted or
     otherwise affected by the NorAm Merger and shall remain outstanding after
     the NorAm Merger.
 
          (b) Cancellation of Treasury Stock and HL&P-Owned Stock. Each share of
     NorAm Common Stock and all other shares of capital stock of NorAm that are
     owned by NorAm as treasury stock and any shares of NorAm Common Stock and
     all other shares of capital stock of NorAm owned by HL&P, Merger Sub or any
     other wholly owned Subsidiary of HL&P or NorAm shall be canceled and
     retired and shall cease to exist and no stock of HL&P or other
     consideration shall be delivered or deliverable in exchange therefor.
 
          (c) Exchange Ratio for NorAm Common Stock.
 
             (i) Subject to the provisions of Section 2.3(f) hereof, each share
        of NorAm Common Stock issued and outstanding immediately prior to the
        NorAm Merger Effective Time (other than NorAm Dissenting Shares (as
        defined in Section 2.2(d)) and shares to be canceled in accordance with
        Section 2.2(b)) shall be converted into (x) the Stock Consideration (as
        defined in Section 2.2(c)(ii)) or (y) $16.00 in cash (the "Cash
        Consideration"), in each case as the holder thereof shall have elected
        or be deemed to have elected, in accordance with Section 2.4
        (collectively, the "Merger Consideration"); provided, however, that, in
        any event, if between the date of this Agreement and the NorAm Merger
        Effective Time the outstanding shares of NorAm Common Stock or HII
        Common Stock shall have been changed into a different number of shares
        or a
 
                                        4
<PAGE>   108
 
        different class by reason of any stock dividend, subdivision,
        reclassification, recapitalization, split, combination or exchange of
        shares (other than, with respect to the HII Common Stock, pursuant to
        the HII/HL&P Merger), the Cash Consideration and the Stock Consideration
        shall be correspondingly adjusted to reflect such stock dividend,
        subdivision, reclassification, recapitalization, split, combination or
        exchange of shares. In the event the Effective Time has not occurred by
        the date that is nine months after the date hereof, the Cash
        Consideration shall be increased by simple interest on such amount at
        the rate of 2% per quarter from the date that is nine months after the
        date hereof to the Effective Time (based on a year of 365 days). All
        such shares of NorAm Common Stock, when so converted, shall no longer be
        outstanding and shall automatically be canceled and retired and shall
        cease to exist, and each holder of a certificate representing any such
        shares shall cease to have any rights with respect thereto, except the
        right to receive the Stock Consideration or the Cash Consideration, as
        the case may be, and cash in lieu of fractional shares of HL&P Common
        Stock as contemplated by Section 2.3(f), to be issued or paid in
        consideration therefor upon the surrender of such certificate in
        accordance with Section 2.3, without interest.
 
             (ii) As used in this Agreement:
 
             "Average Price" means the average of the closing prices of HII
        Common Stock, rounded to four decimal places (if the fifth, sixth and
        seventh decimal places of such average are (x) 499 or lower, then the
        fourth decimal place of such average shall remain the same, or (y) 500
        or higher, then the fourth decimal place of such average shall be
        increased by 1), as reported in The Wall Street Journal's New York Stock
        Exchange Composite Transactions Reports, for each of the first 20
        consecutive Trading Days in the period commencing 25 Trading Days prior
        to the Closing Date.
 
             "Stock Consideration" is (x) if the Average Price of HII Common
        Stock is $21.25 or lower, .7529 shares of HL&P Common Stock; (y) if the
        Average Price of HII Common Stock is $26.00 or greater, .6154 shares of
        HL&P Common Stock; or (z) if the Average Price of the HII Common Stock
        is greater than $21.25 but less than $26.00, that portion of a share of
        HL&P Common Stock equal to the quotient of $16.00 divided by the Average
        Price of the HII Common Stock.
 
             "Trading Day" means a day on which the New York Stock Exchange (the
        "NYSE") is open for trading.
 
          (d) NorAm Dissenting Shares. Notwithstanding anything in this
     Agreement to the contrary, no share of NorAm Common Stock, the holder of
     which shall not have voted shares in favor of the NorAm Merger and shall
     have properly complied with the provisions of Section 262 of the DGCL as to
     appraisal rights (a "NorAm Dissenting Share"), shall be deemed converted
     into and to represent the right to receive Merger Consideration hereunder;
     and the holders of NorAm Dissenting Shares, if any, shall be entitled to
     payment, solely from the NorAm Merger Surviving Corporation, of the
     appraised value of such NorAm Dissenting Shares to the extent permitted by
     and in accordance with the provisions of Section 262 of the DGCL; provided,
     however, that (i) if any holder of NorAm Dissenting Shares shall, under the
     circumstances permitted by the DGCL, subsequently deliver a written
     withdrawal of his or her demand for appraisal of such NorAm Dissenting
     Shares, (ii) if any holder fails to establish his or her entitlement to
     rights to payment as provided in such Section 262 or (iii) if neither any
     holder of NorAm Dissenting Shares nor the NorAm Merger Surviving
     Corporation has filed a petition demanding a determination of the value of
     all NorAm Dissenting Shares within the time provided in such Section 262,
     such holder or holders (as the case may be) shall forfeit such right to
     payment for such NorAm Dissenting Shares pursuant to such Section 262 and
     each such NorAm Dissenting Share shall thereupon be treated as a
     Non-Election Share for purposes of Section 2.4. NorAm shall give HII (i)
     prompt notice of any written demands for appraisal of any NorAm Common
     Stock, attempted withdrawals of such demands and any other instruments
     received by NorAm relating to stockholders' rights of appraisal and (ii)
     the opportunity to direct all negotiations and proceedings with respect to
     demands for appraisal under the DGCL. NorAm shall not, except with the
     prior written consent of HII, voluntarily make any payment with respect to
     any demands for appraisals of NorAm Common Stock, offer to settle or settle
     any such demands or approve any withdrawal of any such demands.
 
                                        5
<PAGE>   109
 
          (e) Treatment of NorAm Stock Options.
 
             (i) Each holder of an unexpired employee stock option to purchase
        NorAm Common Stock, along with any tandem stock appreciation right, that
        is outstanding at the Effective Time (a "NorAm Stock Option"), whether
        or not then exercisable, shall be entitled within the NorAm Stock Option
        Election Period (as hereinafter defined) to elect to either (x) have all
        or any portion of his or her NorAm Stock Options canceled and "cashed
        out" pursuant to Section 2.2(e)(ii) or (y) have all or any portion of
        his or her NorAm Stock Options assumed by HL&P as provided in Section
        5.11. Elections to be made by holders of NorAm Stock Options shall be
        made on a form mutually agreed upon by NorAm and HL&P (a "NorAm Stock
        Option Election Form") to be provided by NorAm to such holders on the
        day on which HL&P publicly announces the Closing Date (which date shall
        be no less than five Trading Days prior to the Closing Date). To be
        effective, a NorAm Stock Option Election Form must be properly
        completed, signed and submitted to HL&P or its designated agent by 5:00
        p.m. on the business day immediately prior to the Closing Date. A holder
        of NorAm Stock Options who does not make a proper election shall be
        deemed to have elected to have his or her NorAm Stock Options "cashed
        out" pursuant to Section 2.2(e)(ii). For purposes of this Agreement, the
        "NorAm Stock Option Election Period" means the period of time beginning
        on the day on which HL&P publicly announces the Closing Date and ending
        at 5:00 p.m. on the business day immediately prior to the Closing Date.
 
             (ii) If a holder of NorAm Stock Options elects to be "cashed out"
        pursuant to this Section or does not properly make an election in
        accordance with Section 2.2(e)(i), the NorAm Stock Options of such
        holder shall be canceled by NorAm immediately prior to the Effective
        Time, and each such holder of a canceled NorAm Stock Option shall be
        entitled to receive, as soon as practicable after the Effective Time, in
        consideration for the cancellation of such NorAm Stock Option an amount
        in cash equal to the product (the "Spread") of (x) the total number of
        shares of NorAm Common Stock subject to such NorAm Stock Option and (y)
        the excess, if any, of (1) the Cash Consideration over (2) the exercise
        price per share of the NorAm Common Stock previously subject to such
        NorAm Stock Option.
 
   
          (f) NorAm Convertible Debentures. HL&P shall agree to assume all of
     NorAm's obligations under NorAm's 6% Convertible Subordinated Debentures
     due 2012 (the "NorAm Convertible Debentures"), including, without
     limitation, the conversion provisions of the NorAm Convertible Debentures.
     Following the Effective Time, each outstanding NorAm Convertible Debenture
     will be convertible into the amount of Stock Consideration (and cash in
     lieu of fractional shares of HL&P Common Stock) and Cash Consideration
     which the holder thereof would have had the right to receive after the
     Effective Time if such NorAm Convertible Debenture had been converted
     immediately prior to the Effective Time and the holder thereof had made the
     Stock Election and received the Stock Consideration with respect to 50% of
     the shares of NorAm Common Stock issuable upon such conversion of the
     holder's NorAm Convertible Debentures and made the Cash Election and
     received the Cash Consideration with respect to the remaining 50% of such
     NorAm Common Stock.
    
 
   
          (g) NorAm Convertible Junior Debentures. HL&P shall agree to assume
     all of NorAm's obligations under NorAm's 6 1/4% Convertible Junior
     Subordinated Debentures (the "NorAm Convertible Junior Debentures"),
     including, without limitation, the conversion provisions of the NorAm
     Convertible Junior Debentures. Following the Effective Time, each
     outstanding NorAm Convertible Junior Debenture will be convertible into the
     amount of Stock Consideration (and cash in lieu of fractional shares of
     HL&P Common Stock) and Cash Consideration which the holder thereof would
     have had the right to receive after the Effective Time if such NorAm
     Convertible Junior Debenture had been converted immediately prior to the
     Effective Time and the holder thereof had made the Stock Election and
     received the Stock Consideration with respect to 50% of the shares of NorAm
     Common Stock issuable upon such conversion of the holder's NorAm
     Convertible Junior Debentures and made the Cash Election and received the
     Cash Consideration with respect to the remaining 50% of such NorAm Common
     Stock.
    
 
                                        6
<PAGE>   110
 
     2.3  Exchange of Certificates.
 
          (a) Exchange of HII Common Stock. Following the HII/HL&P Merger
     Effective Time, each holder of an outstanding certificate or certificates
     theretofore representing shares of HII Common Stock may, but shall not be
     required to, surrender the same to HL&P for cancellation or transfer, and
     each such holder or transferee will be entitled to receive certificates
     representing the same number of shares of HL&P Common Stock as the shares
     of HII Common Stock previously represented by the stock certificates
     surrendered. Until so surrendered or presented for transfer, each
     outstanding certificate which, prior to the HII/HL&P Merger Effective Time,
     represented HII Common Stock shall be deemed and treated for all purposes
     to represent the ownership of the same number of shares of HL&P Common
     Stock as though such surrender or transfer and exchange had taken place.
     The stock transfer books for the HII Common Stock shall be deemed to be
     closed at the HII/HL&P Merger Effective Time and no transfer of outstanding
     shares of HII Common Stock shall thereafter be made on such books, but when
     certificates that formerly represented shares of HII Common Stock are duly
     presented to HII/HL&P Merger Surviving Corporation or its transfer agent
     for exchange or transfer, HII/HL&P Merger Surviving Corporation will cause
     to be issued in respect thereof certificates representing an equal number
     of shares of HL&P Common Stock.
 
          (b) Exchange Agent. As of the Effective Time, HL&P shall deposit with
     such bank or trust company designated by HL&P and reasonably acceptable to
     NorAm (the "Exchange Agent"), for the benefit of the holders of shares of
     NorAm Common Stock, for exchange in accordance with this Article II,
     through the Exchange Agent, cash equal to the total aggregate Cash
     Consideration and certificates representing the shares of HL&P Common Stock
     (such shares of HL&P Common Stock, together with any dividends or
     distributions with respect thereto and the total aggregate Cash
     Consideration, being hereinafter referred to as the "Exchange Fund")
     issuable pursuant to Section 2.2 in exchange for outstanding shares of
     NorAm Common Stock. The Exchange Agent shall, pursuant to irrevocable
     instructions, deliver the Stock Consideration and the Cash Consideration
     contemplated to be issued pursuant to Section 2.2 out of the Exchange Fund.
     The Exchange Fund shall not be used for any other purpose.
 
          (c) Exchange Procedures. As soon as reasonably practicable after the
     Effective Time, the Exchange Agent shall mail to each holder of record of a
     certificate or certificates which, immediately prior to the Effective Time,
     represented outstanding shares of NorAm Common Stock (the "Certificates"),
     which holder's shares of NorAm Common Stock were converted into the right
     to receive the Merger Consideration: (i) a letter of transmittal (which
     shall specify that delivery shall be effected and risk of loss and title to
     the Certificates shall pass only upon delivery of the Certificates to the
     Exchange Agent, and shall be in such form and have such other provisions as
     HL&P may reasonably specify); and (ii) instructions for use in effecting
     the surrender of the Certificates in exchange for the Merger Consideration.
     Upon surrender of a Certificate for cancellation to the Exchange Agent or
     to such other agent or agents as may be appointed by HL&P, together with
     such letter of transmittal, duly executed, and any other required
     documents, the holder of such Certificate shall be entitled to receive in
     exchange therefor a certificate representing that number of whole shares of
     HL&P Common Stock which such holder has the right to receive pursuant to
     the provisions of this Article II and cash in lieu of fractional shares of
     HL&P Common Stock as contemplated by Section 2.3(f) if such holder is
     entitled to receive the Stock Consideration, or cash, in an amount equal to
     the Cash Consideration, if such holder is entitled to receive the Cash
     Consideration, and the Certificate so surrendered shall forthwith be
     canceled. In the event of a transfer of ownership of NorAm Common Stock
     which is not registered in the transfer records of NorAm, a certificate
     representing the appropriate number of shares of HL&P Common Stock may be
     issued to a transferee if the Certificate representing such NorAm Common
     Stock is presented to the Exchange Agent accompanied by all documents
     required to evidence and effect such transfer and by evidence that any
     applicable stock transfer taxes have been paid. Until surrendered as
     contemplated by this Section 2.3, each Certificate shall be deemed at any
     time after the Effective Time to represent only the right to receive upon
     such surrender the Merger Consideration. The Exchange Agent shall not be
     entitled to vote or exercise any rights of ownership with respect to the
     HL&P Common Stock held by it
 
                                        7
<PAGE>   111
 
     from time to time hereunder, except that it shall receive and hold all
     dividends or other distributions paid or distributed with respect thereto
     for the account of persons entitled thereto.
 
          (d) Distributions with Respect to Unexchanged Shares. No dividends or
     other distributions with respect to HL&P Common Stock declared or made
     after the Effective Time with a record date after the Effective Time shall
     be paid to the holder of any unsurrendered Certificate with respect to the
     right to receive shares of HL&P Common Stock represented thereby and no
     cash payment in lieu of fractional shares shall be paid to any such holder
     pursuant to Section 2.3(f) until the holder of such Certificate shall
     surrender such Certificate. Subject to the effect of applicable laws,
     following surrender of any such Certificate, there shall be paid to the
     holder thereof, without interest, if such holder is entitled to receive the
     Stock Consideration: (i) at the time of such surrender, the amount of any
     cash payable in lieu of a fractional share of HL&P Common Stock to which
     such holder is entitled pursuant to Section 2.3(f) and the amount of
     dividends or other distributions with a record date after the Effective
     Time theretofore paid with respect to such whole shares of HL&P Common
     Stock; and (ii) at the appropriate payment date, the amount of dividends or
     other distributions with a record date after the Effective Time but prior
     to surrender and a payment date subsequent to surrender payable with
     respect to such whole shares of HL&P Common Stock.
 
          (e) No Further Ownership Rights in NorAm Common Stock. All shares of
     HL&P Common Stock issued upon the surrender for exchange of shares of NorAm
     Common Stock in accordance with the terms hereof (including any cash paid
     pursuant to Section 2.3(f)) shall be deemed to have been issued in full
     satisfaction of all rights pertaining to such shares of NorAm Common Stock,
     subject, however, to the NorAm Merger Surviving Corporation's obligation to
     pay any dividends or make any other distributions with a record date prior
     to the Effective Time that may have been declared or made by NorAm on such
     shares of NorAm Common Stock in accordance with the terms of this Agreement
     or prior to the date hereof and which remain unpaid at the Effective Time,
     and after the Effective Time there shall be no further registration of
     transfers on the stock transfer books of the NorAm Merger Surviving
     Corporation of the shares of NorAm Common Stock that were outstanding
     immediately prior to the Effective Time. If, after the Effective Time,
     Certificates are presented to the NorAm Merger Surviving Corporation for
     any reason, they shall be canceled and exchanged as provided in this
     Article II.
 
          (f) No Fractional Shares. No certificates or scrip representing
     fractional shares of HL&P Common Stock shall be issued upon the surrender
     for exchange of Certificates pursuant to this Article II, and, except as
     provided in this Section 2.3(f), no dividend or other distribution, stock
     split or interest shall relate to any such fractional security, and such
     fractional interests shall not entitle the owner thereof to vote or to any
     rights of a security holder of HL&P. In lieu of any fractional security,
     each holder of shares of NorAm Common Stock who would otherwise have been
     entitled to a fraction of a share of HL&P Common Stock upon surrender of
     Certificates for exchange pursuant to this Article II will be paid an
     amount in cash (without interest) equal to such holder's proportionate
     interest in the sum of (i) the net proceeds from the sale or sales by the
     Exchange Agent in accordance with the provisions of this Section 2.3(f), on
     behalf of all such holders, of the aggregate fractional shares of HL&P
     Common Stock issued pursuant to this Article II and (ii) the aggregate
     dividends or other distributions that are payable with respect to such
     shares of HL&P Common Stock pursuant to Section 2.3(d) (such dividends and
     distributions being herein called the "Fractional Dividends"). As soon as
     practicable following the Effective Time, the Exchange Agent shall
     determine the excess of (x) the number of whole shares of HL&P Common Stock
     delivered to the Exchange Agent by HL&P pursuant to Section 2.3(b) over (y)
     the aggregate number of whole shares of HL&P Common Stock to be distributed
     to the former holders of NorAm Common Stock pursuant to Section 2.3(c)
     (such excess being herein called the "Excess Securities") and the Exchange
     Agent, as agent for the former holders of NorAm Common Stock, shall sell
     the Excess Securities at the prevailing prices on the NYSE. The sale of the
     Excess Securities by the Exchange Agent shall be executed on the NYSE
     through one or more member firms of the NYSE and shall be executed in round
     lots to the extent practicable. HL&P shall pay all commissions, transfer
     taxes and other out-of-pocket transaction costs, including the expenses and
     compensation of the Exchange Agent, incurred in connection with such sale
     of Excess Securities. Until the net proceeds of such sale of
 
                                        8
<PAGE>   112
 
     Excess Securities and the Fractional Dividends have been distributed to the
     former stockholders of NorAm, the Exchange Agent will hold such proceeds
     and dividends in trust for such former stockholders. As soon as practicable
     after the determination of the amount of cash to be paid to former
     stockholders of NorAm in lieu of any fractional interests, the Exchange
     Agent shall make available in accordance with this Agreement such amounts
     to such former stockholders.
 
          (g) Termination of Exchange Agent. Any portion of the Exchange Fund
     and any cash in lieu of fractional shares of HL&P Common Stock made
     available to the Exchange Agent that remain undistributed to the former
     stockholders of NorAm for one year after the Effective Time shall be
     delivered to HL&P, upon demand, which shall thereafter act as the Exchange
     Agent, and any former stockholders of NorAm who have not theretofore
     complied with this Article II shall thereafter look only as a general
     creditor to HL&P for payment of their claim for the Merger Consideration
     and any cash in lieu of fractional shares of HL&P Common Stock and any
     dividends or distributions with respect to HL&P Common Stock if such holder
     is entitled to receive the Stock Consideration.
 
          (h) No Liability. None of HII, HL&P, Merger Sub or NorAm shall be
     liable to any holder of shares of HII Common Stock, NorAm Common Stock or
     HL&P Common Stock, as the case may be, for such shares (or dividends or
     distributions with respect thereto), cash in lieu of fractional shares of
     HL&P Common Stock, Stock Consideration or Cash Consideration delivered to a
     public official pursuant to any applicable abandoned property, escheat or
     similar law. Any amounts remaining unclaimed by holders of any such shares
     six years after the Effective Time (or such earlier date immediately prior
     to the time at which such amounts would otherwise escheat to or become
     property of any governmental entity) shall, to the extent permitted by
     applicable law, become the property of HL&P free and clear of any claims or
     interest of any such holders or their successors, assigns or personal
     representatives previously entitled thereto.
 
     2.4  Allocation of Merger Consideration; Election Procedures.
 
          (a) Allocation. Notwithstanding anything in this Agreement to the
     contrary, the number of shares of NorAm Common Stock to be converted into
     the right to receive the Cash Consideration in the NorAm Merger (the "Cash
     Election Number") shall be equal to (i) 50% of the number of shares of
     NorAm Common Stock issued and outstanding immediately prior to the
     Effective Time (ignoring for this purpose any NorAm Common Stock held as
     treasury shares and canceled pursuant to Section 2.2(b)) less (ii) the sum
     of (A) the number of NorAm Dissenting Shares, if any, which are not to be
     treated as Non-Election Shares (as defined in Section 2.4(b)) pursuant to
     Section 2.2(d) determined as of the Effective Time, (B) the number of
     shares of NorAm Common Stock held by HL&P, Merger Sub or any other wholly
     owned Subsidiary of HL&P or NorAm to be canceled in accordance with Section
     2.2(b) and (C) the number of shares of NorAm Common Stock to be exchanged
     for cash pursuant to Section 2.3(f). The number of shares of NorAm Common
     Stock to be converted into the right to receive the Stock Consideration in
     the NorAm Merger (the "Stock Election Number") shall be equal to the number
     of shares of NorAm Common Stock issued and outstanding immediately prior to
     the Effective Time (ignoring for this purpose any NorAm Common Stock held
     as treasury shares and canceled pursuant to Section 2.2(b)) less the sum of
     (i) the Cash Election Number, (ii) the number of NorAm Dissenting Shares,
     if any, which are not to be treated as Non-Election Shares pursuant to
     Section 2.2(d) determined as of the Effective Time, (iii) the number of
     shares of NorAm Common Stock held by HL&P, Merger Sub or any other wholly
     owned Subsidiary of HL&P or NorAm to be canceled in accordance with Section
     2.2(b) and (iv) the number of shares of NorAm Common Stock to be exchanged
     for cash pursuant to Section 2.3(f). Notwithstanding anything to the
     contrary herein, HII shall have the option, in its sole discretion, to
     change the Cash Election Number and the Stock Election Number to more
     closely follow the actual elections of the NorAm stockholders pursuant to
     this Section 2.4, so long as such modification to the Cash Election Number
     and the Stock Election Number does not prevent the conditions set forth in
     Sections 6.2(e) and 6.3(c) from being satisfied. The parties hereto
     acknowledge that (i) the number of NorAm Dissenting Shares, if any, which
     are not to be treated as Non-Election Shares pursuant to Section 2.2(d)
     determined as of the Effective Time, (ii) the number
 
                                        9
<PAGE>   113
 
     of shares of NorAm Common Stock held by HL&P, Merger Sub or any other
     wholly owned Subsidiary of HL&P or NorAm to be canceled in accordance with
     Section 2.2(b) and (iii) the number of shares of NorAm Common Stock to be
     exchanged for cash pursuant to Section 2.3(f) are all treated under the
     published guidelines of the IRS as receiving cash in the mergers
     contemplated hereby.
 
          (b) Election. Subject to allocation and proration in accordance with
     the provisions of this Section 2.4, each record holder of shares of NorAm
     Common Stock (other than NorAm Dissenting Shares, if any, which are not to
     be treated as Non-Election Shares pursuant to Section 2.2(d) and shares to
     be canceled in accordance with Section 2.2(b)) issued and outstanding
     immediately prior to the Election Deadline (as defined in Section 2.4(c))
     shall be entitled to elect to receive in respect of each such share (i) the
     Cash Consideration (a "Cash Election") or (ii) the Stock Consideration (a
     "Stock Election") or to indicate that such record holder has no preference
     as to the receipt of the Cash Consideration or the Stock Consideration for
     such shares (a "Non-Election"). Shares of NorAm Common Stock in respect of
     which a Non-Election is made (including shares in respect of which such an
     election is deemed to have been made pursuant to this Section 2.4 and
     Section 2.2(d)) (collectively, "Non-Election Shares") shall be deemed by
     HL&P, in its sole and absolute discretion, to be shares in respect of which
     Cash Elections or Stock Elections have been made.
 
          (c) Procedure for Elections. Elections pursuant to Section 2.4(b)
     shall be made on a form to be mutually agreed upon by NorAm and HL&P (a
     "Form of Election") to be provided by the Exchange Agent for that purpose
     to holders of record of NorAm Common Stock, together with appropriate
     transmittal materials, at the time of mailing to holders of record of NorAm
     Common Stock of the Joint Proxy Statement (as defined in Section
     3.1(c)(iii)). Elections shall be made by mailing to the Exchange Agent a
     duly completed Form of Election. To be effective, a Form of Election must
     be (i) properly completed, signed and submitted to the Exchange Agent at
     its designated office by 5:00 p.m. on the business day that is the Trading
     Day immediately prior to the Closing Date (which date shall be publicly
     announced by HL&P as soon as practicable but in no event less than five
     Trading Days prior to the Closing Date) (the "Election Deadline") and (ii)
     accompanied by the Certificates as to which the election is being made (or
     by an appropriate guarantee of delivery of such Certificates by a
     commercial bank or trust company in the United States or a member of a
     registered national security exchange or of the National Association of
     Securities Dealers, Inc., provided such Certificates are in fact delivered
     to the Exchange Agent within eight Trading Days after the date of execution
     of such guarantee of delivery). NorAm shall use its best efforts to make a
     Form of Election available to all persons who become holders of record of
     NorAm Common Stock between the date of mailing described in the first
     sentence of this Section 2.4(c) and the Election Deadline. HL&P shall
     determine, in its sole and absolute discretion, which authority it may
     delegate in whole or in part to the Exchange Agent, whether Forms of
     Election have been properly completed, signed and submitted or revoked. The
     decision of HL&P (or the Exchange Agent, as the case may be) in such
     matters shall be conclusive and binding. Neither HL&P nor the Exchange
     Agent will be under any obligation to notify any person of any defect in a
     Form of Election submitted to the Exchange Agent. A holder of shares of
     NorAm Common Stock that does not submit an effective Form of Election prior
     to the Election Deadline shall be deemed to have made a Non-Election.
 
          (d) Revocation of Election; Return of Certificates. An election may be
     revoked, but only by written notice received by the Exchange Agent prior to
     the Election Deadline. Any certificate(s) representing shares of NorAm
     Common Stock which have been submitted to the Exchange Agent in connection
     with an election shall be returned without charge to the holder thereof in
     the event such election is revoked as aforesaid and such holder requests in
     writing the return of such certificate(s). Upon any such revocation, unless
     a duly completed Form of Election is thereafter submitted in accordance
     with Section 2.4(c), such shares shall be Non-Election Shares. In the event
     that this Agreement is terminated pursuant to the provisions hereof and any
     shares of NorAm Common Stock have been transmitted to the Exchange Agent
     pursuant to the provisions hereof, such shares shall promptly be returned
     without charge to the person submitting the same.
 
                                       10
<PAGE>   114
 
          (e) Proration of Cash Election Shares. In the event that the aggregate
     number of shares in respect of which Cash Elections have been made and, in
     the case of Non-Election Shares, are deemed to have been made
     (collectively, the "Cash Election Shares") exceeds the Cash Election
     Number, all shares of NorAm Common Stock in respect of which Stock
     Elections have been made and all Non-Election Shares in respect of which
     Stock Elections are deemed to have been made (collectively, the "Stock
     Election Shares") shall be converted into the right to receive the Stock
     Consideration, and the Cash Election Shares shall be converted into the
     right to receive the Stock Consideration or the Cash Consideration in the
     following manner:
 
             (i) Cash Election Shares shall be deemed to be Stock Election
        Shares, on a pro-rata basis for each record holder of NorAm Common Stock
        with respect to those shares of NorAm Common Stock, if any, of such
        record holder which are Cash Election Shares, so that the number of Cash
        Election Shares so deemed to be Stock Election Shares, when added to the
        other Stock Election Shares, shall equal as closely as practicable the
        Stock Election Number, and all such Cash Election Shares so deemed to be
        Stock Election Shares shall be converted into the right to receive the
        Stock Consideration (and cash in lieu of fractional interests in
        accordance with Section 2.3(f)); and
 
             (ii) any remaining Cash Election Shares shall be converted into the
        right to receive the Cash Consideration.
 
          (f) Proration of Stock Election Shares. In the event that the
     aggregate number of Stock Election Shares exceeds the Stock Election
     Number, all Cash Election Shares shall be converted into the right to
     receive the Cash Consideration, and all Stock Election Shares shall be
     converted into the right to receive the Stock Consideration or the Cash
     Consideration in the following manner:
 
             (i) Stock Election Shares shall be deemed to be Cash Election
        Shares, on a pro-rata basis for each record holder of NorAm Common Stock
        with respect to those shares of NorAm Common Stock, if any, of such
        record holder which are Stock Election Shares, so that the number of
        Stock Election Shares so deemed to be Cash Election Shares, when added
        to the other Cash Election Shares, shall equal as closely as practicable
        the Cash Election Number, and all such Stock Election Shares so deemed
        to be Cash Election Shares shall be converted into the right to receive
        the Cash Consideration; and
 
             (ii) the remaining Stock Election Shares shall be converted into
        the right to receive the Stock Consideration (and cash in lieu of
        fractional interests in accordance with Section 2.3(f)).
 
          (g) No Proration. In the event that neither paragraph (e) nor
     paragraph (f) of this Section 2.4 is applicable, all Cash Election Shares
     shall be converted into the right to receive the Cash Consideration and all
     Stock Election Shares shall be converted into the right to receive the
     Stock Consideration (and cash in lieu of fractional interests in accordance
     with Section 2.3(f)).
 
          (h) Computations. The Exchange Agent, in consultation with HL&P, shall
     make all computations to give effect to this Section 2.4.
 
                                  ARTICLE III
 
                         REPRESENTATIONS AND WARRANTIES
 
     3.1  Representations and Warranties of NorAm. NorAm represents and warrants
to HII, HL&P and Merger Sub as follows, except as set forth in the disclosure
schedule dated as of the date hereof and signed by an authorized officer of
NorAm and delivered to HII by NorAm on or prior to the date hereof (the "NorAm
Disclosure Schedule"), each of which exceptions shall specifically identify the
relevant Section hereof to which it relates:
 
          (a) Organization, Standing and Power. Each of NorAm and its
     Significant Subsidiaries (as hereinafter defined) is a corporation or
     partnership duly organized, validly existing and in good standing under the
     laws of its state of incorporation or organization, has all requisite power
     and authority to own,
 
                                       11
<PAGE>   115
 
     lease and operate its properties and to carry on its business as now being
     conducted, and is duly qualified and in good standing to do business in
     each jurisdiction in which the business it is conducting, or the operation,
     ownership or leasing of its properties, makes such qualification necessary,
     other than in such jurisdictions where the failure so to qualify would not
     have a Material Adverse Effect (as hereinafter defined). NorAm has
     heretofore delivered to HII complete and correct copies of its Restated
     Certificate of Incorporation and Bylaws. All Significant Subsidiaries of
     NorAm and their respective jurisdictions of incorporation or organization
     are identified on Schedule 3.1(a) of the NorAm Disclosure Schedule. As used
     in this Agreement: (i) a "Significant Subsidiary" means any Subsidiary of
     NorAm, HII or HL&P, as the case may be, that would constitute a Significant
     Subsidiary of such party within the meaning of Rule 1-02 of Regulation S-X
     of the Securities and Exchange Commission (the "SEC"); and (ii) a "Material
     Adverse Effect" or "Material Adverse Change" shall mean, in respect of
     NorAm or HII, as the case may be, any effect or change that is or, as far
     as can be reasonably determined, may be, materially adverse to the
     business, operations, assets, prospects, condition (financial or otherwise)
     or results of operations of such party and its Subsidiaries taken as a
     whole.
 
          (b) Capital Structure. As of the date hereof, the authorized capital
     stock of NorAm consists of 250,000,000 shares of NorAm Common Stock and
     10,000,000 shares of preferred stock, par value $0.10 per share (the "NorAm
     Preferred Stock"). At the close of business on July 31, 1996: (i)
     137,067,805 shares of NorAm Common Stock and no shares of NorAm Preferred
     Stock were issued and outstanding, and 4,906,322 shares of NorAm Common
     Stock and no shares of NorAm Preferred Stock were reserved for issuance
     pursuant to NorAm's:
 
<TABLE>
        <S>                                                                 <C>
        Incentive Equity Plan.............................................  3,035,010
        1983 Non-Qualified Stock Option Plan..............................     11,000
        Diversified Energies Plan.........................................     57,229
        Restricted Stock Plan for Non-Employee Directors..................     79,742
        Employee Stock Purchase Plan......................................  1,723,341
</TABLE>
 
     (collectively, the "NorAm Stock Plans"); (ii) no shares of NorAm Common
     Stock were held by NorAm in its treasury; and (iii) except for the NorAm
     Convertible Debentures and the NorAm Convertible Junior Debentures, no
     bonds, debentures, notes or other indebtedness having the right to vote (or
     convertible into securities having the right to vote) on any matters on
     which NorAm stockholders may vote ("Voting Debt") were issued or
     outstanding. All outstanding shares of NorAm Common Stock are validly
     issued, fully paid and nonassessable and are not subject to preemptive
     rights. All outstanding shares of capital stock of the Subsidiaries of
     NorAm are owned by NorAm, or a direct or indirect wholly owned Subsidiary
     of NorAm, free and clear of all liens, charges, encumbrances, claims and
     options of any nature. Except as set forth above and except for changes
     since July 31, 1996 resulting from the exercise of employee stock options
     granted pursuant to, or from issuances or purchases under, the NorAm Stock
     Plans, NorAm's Direct Stock Purchase and Dividend Reinvestment Plans,
     NorAm's Annual Incentive Plan, the Restricted Stock Agreement between
     Milton Honea and NorAm dated January 31, 1996, the conversion of the NorAm
     Convertible Debentures or the NorAm Convertible Junior Debentures or as
     contemplated by this Agreement, there are outstanding: (A) no shares of
     capital stock, Voting Debt or other voting securities of NorAm; (B) no
     securities of NorAm or any Subsidiary of NorAm convertible into or
     exchangeable for shares of capital stock, Voting Debt or other voting
     securities of NorAm or any Subsidiary of NorAm; and (C) no options,
     warrants, calls, rights (including preemptive rights), commitments or
     agreements to which NorAm or any Subsidiary of NorAm is a party or by which
     it is bound in any case obligating NorAm or any Subsidiary of NorAm to
     issue, deliver, sell, purchase, redeem or acquire, or cause to be issued,
     delivered, sold, purchased, redeemed or acquired, additional shares of
     capital stock or any Voting Debt or other voting securities of NorAm or of
     any Subsidiary of NorAm, or obligating NorAm or any Subsidiary of NorAm to
     grant, extend or enter into any such option, warrant, call, right,
     commitment or agreement. There are not as of the date hereof and there will
     not be at the NorAm Merger Effective Time any stockholder agreements,
     voting trusts or other agreements or understandings to which NorAm is a
     party or by which it is bound relating to the voting of any shares of the
     capital stock of NorAm that will limit in any way the solicitation of
     proxies by or on behalf of NorAm
 
                                       12
<PAGE>   116
 
     from, or the casting of votes by, the stockholders of NorAm with respect to
     the NorAm Merger. There are no restrictions on NorAm to vote the stock of
     any of its Subsidiaries.
 
          (c) Authority; No Violations; Consents and Approvals.
 
             (i) The Board of Directors of NorAm has approved the NorAm Merger
        and this Agreement, by the unanimous vote of all of the directors with
        no negative vote, and declared the NorAm Merger and this Agreement to be
        in the best interests of the stockholders of NorAm. The directors have
        advised NorAm, HII and HL&P that they intend to vote or cause to be
        voted all of the shares of NorAm Common Stock beneficially owned by them
        and their affiliates in favor of approval of the NorAm Merger and this
        Agreement. NorAm has all requisite corporate power and authority to
        enter into this Agreement and, subject, with respect to consummation of
        the NorAm Merger, to approval of this Agreement and the NorAm Merger by
        the stockholders of NorAm in accordance with the DGCL, to consummate the
        transactions contemplated hereby. The execution and delivery of this
        Agreement and the consummation of the transactions contemplated hereby
        have been duly authorized by all necessary corporate action on the part
        of NorAm, subject, with respect to consummation of the NorAm Merger, to
        approval of this Agreement and the NorAm Merger by the stockholders of
        NorAm in accordance with the DGCL. This Agreement has been duly executed
        and delivered by NorAm and, subject, with respect to consummation of the
        NorAm Merger, to approval of this Agreement and the NorAm Merger by the
        stockholders of NorAm in accordance with the DGCL, and assuming this
        Agreement constitutes the valid and binding obligation of HII, HL&P and
        Merger Sub, constitutes a valid and binding obligation of NorAm
        enforceable in accordance with its terms, subject, as to enforceability,
        to bankruptcy, insolvency, reorganization and other laws of general
        applicability relating to or affecting creditors' rights and to general
        principles of equity.
 
             (ii) The execution and delivery of this Agreement does not, and the
        consummation of the transactions contemplated hereby and compliance with
        the provisions hereof will not, conflict with, or result in any
        violation of, or default (with or without notice or lapse of time, or
        both) under, or give rise to a right of termination, cancellation or
        acceleration of any obligation or to the loss of a material benefit
        under, or result in the creation of any lien, security interest, charge
        or encumbrance upon any of the properties or assets of NorAm or any of
        its Subsidiaries under, any provision of (A) the Restated Certificate of
        Incorporation or Bylaws of NorAm or any provision of the comparable
        charter or organizational documents of any of its Subsidiaries, (B)
        subject to obtaining the third-party consents set forth in Section
        3.1(c)(ii) of the NorAm Disclosure Schedule (the "NorAm Required
        Consents"), any loan or credit agreement, note, bond, mortgage,
        indenture, lease or other agreement, instrument, permit, concession,
        franchise or license applicable to NorAm or any of its Subsidiaries or
        (C) assuming the consents, approvals, authorizations or permits and
        filings or notifications referred to in Section 3.1(c)(iii) are duly and
        timely obtained or made and the approval of the NorAm Merger and this
        Agreement by the stockholders of NorAm in accordance with the DGCL has
        been obtained, any judgment, order, decree, statute, law, ordinance,
        rule or regulation applicable to NorAm or any of its Subsidiaries or any
        of their respective properties or assets, other than, in the case of
        clause (B) or (C), any such conflicts, violations, defaults, rights,
        liens, security interests, charges or encumbrances that, individually or
        in the aggregate, would not have a Material Adverse Effect on NorAm,
        materially impair the ability of NorAm to perform its obligations
        hereunder or prevent the consummation of any of the transactions
        contemplated hereby.
 
             (iii) No consent, approval, order or authorization of, or
        registration, declaration or filing with, or permit from any court,
        governmental, regulatory or administrative agency or commission or other
        governmental authority or instrumentality, domestic or foreign (a
        "Governmental Entity"), is required by or with respect to NorAm or any
        of its Subsidiaries in connection with the execution and delivery of
        this Agreement by NorAm or the consummation by NorAm of the transactions
        contemplated hereby, as to which the failure to obtain or make would
        have a Material Adverse Effect, except for: (A) the filing of a
        premerger notification report by NorAm under the Hart-Scott-Rodino
        Antitrust Improvements Act of 1976, as amended (the "HSR Act"), and the
        expiration or termination of the applicable waiting period with respect
        thereto; (B) the filing with the SEC of
 
                                       13
<PAGE>   117
 
        (x) a joint proxy statement in preliminary and definitive form relating
        to the meeting of NorAm's stockholders to be held in connection with the
        NorAm Merger and the meeting of HII's shareholders to be held in
        connection with the Mergers (the "Joint Proxy Statement") and (y) such
        reports under Section 13(a) of the Securities Exchange Act of 1934, as
        amended (the "Exchange Act"), and such other compliance with the
        Exchange Act and the rules and regulations thereunder, as may be
        required in connection with this Agreement and the transactions
        contemplated hereby; (C) the filing of the NorAm Merger Certificate of
        Merger with the Secretary of State of the State of Delaware; (D) filings
        with, and the approval of, or notices to, the Arkansas Public Service
        Commission, the Louisiana Public Service Commission, the Minnesota
        Public Utilities Commission, the Oklahoma Corporation Commission and the
        Mississippi Public Service Commission; (E) filings with, and the
        approval of, or notices to, the Federal Energy Regulatory Commission
        (the "FERC") in connection with the transfer of NorAm Energy Services,
        Inc.'s power marketing certificate; (F) such filings and approvals as
        are set forth on Section 3.1(c)(iii) of the NorAm Disclosure Schedule in
        connection with the transfer of NorAm's municipal franchises; (G) such
        filings and approvals as may be required by any applicable state
        securities, "blue sky" or takeover laws or environmental laws; and (H)
        such filings and approvals as may be required by any foreign premerger
        notification, securities, corporate or other law, rule or regulation.
 
          (d) SEC Documents. NorAm has made available to HL&P a true and
     complete copy of each report, schedule, registration statement and
     definitive proxy statement filed by NorAm with the SEC since January 1,
     1994 and prior to the date of this Agreement (the "NorAm SEC Documents")
     which are all the documents (other than preliminary material) that NorAm
     was required to file with the SEC since such date. As of their respective
     dates, the NorAm SEC Documents complied in all material respects with the
     requirements of the Securities Act of 1933, as amended (the "Securities
     Act"), or the Exchange Act, as the case may be, and the rules and
     regulations of the SEC thereunder applicable to such NorAm SEC Documents,
     and none of the NorAm SEC Documents contained any untrue statement of a
     material fact or omitted to state a material fact required to be stated
     therein or necessary to make the statements therein, in light of the
     circumstances under which they were made, not misleading. The financial
     statements of NorAm included in the NorAm SEC Documents complied as to form
     in all material respects with the published rules and regulations of the
     SEC with respect thereto, were prepared in accordance with generally
     accepted accounting principles ("GAAP") applied on a consistent basis
     during the periods involved (except as may be indicated in the notes
     thereto or, in the case of the unaudited statements, as permitted by Rule
     10-01 of Regulation S-X of the SEC) and fairly present in accordance with
     applicable requirements of GAAP (subject, in the case of the unaudited
     statements, to normal, recurring adjustments, none of which will be
     material) the consolidated financial position of NorAm and its consolidated
     Subsidiaries as of their respective dates and the consolidated results of
     operations and the consolidated cash flows of NorAm and its consolidated
     Subsidiaries for the periods presented therein. Except as disclosed in the
     NorAm SEC Documents, there are no agreements, arrangements or
     understandings between NorAm and any party who is at the date of this
     Agreement or was at any time prior to the date hereof but after January 1,
     1994 an Affiliate (as defined in Section 4.1(k)) of NorAm that are required
     to be disclosed in the NorAm SEC Documents.
 
          (e) Information Supplied. None of the information supplied or to be
     supplied by NorAm for inclusion or incorporation by reference in the
     Registration Statement on Form S-4 to be filed with the SEC by HL&P in
     connection with the issuance of shares of HL&P Common Stock in the Mergers
     (the "S-4") will, at the time the S-4 becomes effective under the
     Securities Act or at the Effective Time, contain any untrue statement of a
     material fact or omit to state any material fact required to be stated
     therein or necessary to make the statements therein not misleading, and
     none of the information supplied or to be supplied by NorAm and included or
     incorporated by reference in the Joint Proxy Statement will, at the date
     mailed to stockholders of NorAm and the shareholders of HII or at the time
     of the meeting of such stockholders or shareholders to be held in
     connection with the Mergers or at the Effective Time, contain any untrue
     statement of a material fact or omit to state any material fact required to
     be stated therein or necessary in order to make the statements therein, in
     light of the circumstances under which they are made, not misleading. If at
     any time prior to the Effective Time any event with respect to
 
                                       14
<PAGE>   118
 
     NorAm or any of its Subsidiaries, or with respect to other information
     supplied by NorAm for inclusion in the Joint Proxy Statement or the S-4,
     shall occur which is required to be described in an amendment of, or a
     supplement to, the Joint Proxy Statement or the S-4, such event shall be so
     described, and such amendment or supplement shall be promptly filed with
     the SEC and, as required by law, disseminated to the stockholders of NorAm.
     The Joint Proxy Statement, insofar as it relates to NorAm or its
     Subsidiaries or other information supplied by NorAm for inclusion therein,
     will comply as to form in all material respects with the provisions of the
     Exchange Act and the rules and regulations thereunder.
 
          (f) Absence of Certain Changes or Events. Except as disclosed in, or
     reflected in the financial statements included in, the NorAm SEC Documents,
     or except as contemplated by this Agreement, since December 31, 1995, there
     has not been: (i) any declaration, setting aside or payment of any dividend
     or other distribution (whether in cash, stock or property) with respect to
     any of NorAm's capital stock, except for regular quarterly cash dividends
     of $.07 per share on NorAm Common Stock (or a pro rata amount for any
     dividend less than a full quarter) with usual record and payment dates for
     such dividends; (ii) any amendment of any material term of any outstanding
     equity security of NorAm or any Subsidiary of NorAm; (iii) any repurchase,
     redemption or other acquisition by NorAm or any Subsidiary of NorAm of any
     outstanding shares of capital stock or other equity securities of, or other
     ownership interests in, NorAm or any Subsidiary of NorAm, except as
     contemplated by any NorAm Benefit Plans (as defined in Section 3.1(l)) and
     except for the exchange of NorAm's Series A Preferred Stock for NorAm
     Convertible Debentures; (iv) any material change in any method of
     accounting or accounting practice by NorAm or any Significant Subsidiary of
     NorAm; or (v) any other transaction, commitment, dispute or other event or
     condition (financial or otherwise) of any character (whether or not in the
     ordinary course of business) that could have a Material Adverse Effect on
     NorAm, except for general economic changes and changes that may affect the
     industries of NorAm or any of its Subsidiaries generally.
 
          (g) No Undisclosed Material Liabilities. Except as disclosed in the
     NorAm SEC Documents, as of the date hereof, there are no liabilities of
     NorAm or any of its Subsidiaries of any kind whatsoever, whether accrued,
     contingent, absolute, determined, determinable or otherwise, that are
     reasonably likely to have a Material Adverse Effect on NorAm, other than:
     (i) liabilities adequately provided for on the balance sheet of NorAm dated
     as of March 31, 1996 (including the notes thereto) contained in NorAm's
     Quarterly Report on Form 10-Q for the quarter ended March 31, 1996; and
     (ii) liabilities under this Agreement.
 
          (h) No Default. Neither NorAm nor any of its Subsidiaries is in
     default or violation (and no event has occurred which, with notice or the
     lapse of time or both, would constitute a default or violation) of any
     term, condition or provision of (i) their respective charter, bylaws or
     respective formation documentation, (ii) any note, bond, mortgage,
     indenture, license, agreement or other instrument or obligation to which
     NorAm or any of its Subsidiaries is now a party or by which NorAm or any of
     its Subsidiaries or any of their respective properties or assets may be
     bound (except for the requirement under certain of such instruments to file
     supplemental indentures as a result of the transactions contemplated
     hereby) or (iii) any order, writ, injunction, decree, statute, rule or
     regulation applicable to NorAm or any of its Subsidiaries, except in the
     case of (ii) and (iii) for defaults or violations which in the aggregate
     would not have a Material Adverse Effect on NorAm.
 
          (i) Compliance with Applicable Laws. NorAm and its Subsidiaries hold
     all permits, licenses, variances, exemptions, orders, franchises and
     approvals of all Governmental Entities necessary for the lawful conduct of
     their respective businesses (the "NorAm Permits"), except where the failure
     so to hold would not have a Material Adverse Effect on NorAm. NorAm and its
     Subsidiaries are in compliance with the terms of the NorAm Permits, except
     where the failure so to comply would not have a Material Adverse Effect on
     NorAm. Except as disclosed in the NorAm SEC Documents, the businesses of
     NorAm and its Subsidiaries are not being conducted in violation of any law,
     ordinance or regulation of any Governmental Entity, except for possible
     violations which would not have a Material Adverse Effect on NorAm. As of
     the date of this Agreement, neither NorAm nor any of its Subsidiaries has
     been notified of any pending investigation or review by any Governmental
     Entity or, to the best knowledge of NorAm,
 
                                       15
<PAGE>   119
 
     no investigation or review by any Governmental Entity with respect to NorAm
     or any of its Subsidiaries is threatened, other than those the outcome of
     which would not have a Material Adverse Effect on NorAm.
 
          (j) Litigation. Except as disclosed in the NorAm SEC Documents, there
     is no suit, action or proceeding pending, or, to the best knowledge of
     NorAm, threatened against or affecting NorAm or any Subsidiary of NorAm
     ("NorAm Litigation"), and NorAm and its Subsidiaries have no knowledge of
     any facts that are likely to give rise to any NorAm Litigation, that (in
     any case) is reasonably likely to have a Material Adverse Effect on NorAm,
     nor is there any judgment, decree, injunction, rule or order of any
     Governmental Entity or arbitrator outstanding against NorAm or any
     Subsidiary of NorAm ("NorAm Order") that is reasonably likely to have a
     Material Adverse Effect on NorAm or its ability to consummate the
     transactions contemplated by this Agreement.
 
          (k) Taxes. Except as would not, individually or in the aggregate, have
     a Material Adverse Effect on NorAm:
 
             (i) Each of NorAm, each of its Subsidiaries and any affiliated,
        combined or unitary group of which any such corporation is or was a
        member has (A) timely (taking into account any extensions) filed all
        federal income tax and all other material federal and all material
        state, local and foreign returns, declarations, reports, estimates,
        information returns and statements ("Returns") required to be filed or
        sent by or with respect to it in respect of any Taxes (as hereinafter
        defined), (B) timely paid all Taxes that are due and payable (except for
        audit adjustments not material in the aggregate or to the extent that
        liability therefor is reserved for in NorAm's most recent audited
        financial statements) for which NorAm or any of its Subsidiaries may be
        liable, (C) established reserves that are adequate for the payment of
        all Taxes not yet due and payable with respect to the results of
        operations of NorAm and its Subsidiaries through the date hereof and (D)
        to the knowledge of NorAm or any Subsidiary of NorAm, complied in all
        material respects with all applicable laws, rules and regulations
        relating to the payment and withholding of Taxes and has in all material
        respects timely withheld from employee wages and paid over to the proper
        governmental authorities all amounts required to be so withheld and paid
        over.
 
             (ii) Section 3.1(k)(ii) of the NorAm Disclosure Schedule sets forth
        the last taxable period through which the federal income tax Returns of
        NorAm and any of its Subsidiaries have been examined by the Internal
        Revenue Service ("IRS") or otherwise closed. Except to the extent being
        contested in good faith, all material deficiencies asserted as a result
        of such examinations and any examination by any applicable state or
        local taxing authority have been paid, fully settled or adequately
        provided for in NorAm's most recent audited financial statements. Except
        as adequately provided for in the NorAm SEC Documents, no material
        federal, state or local income or franchise tax audits or other
        administrative proceedings or court proceedings are presently pending
        with regard to any federal, state or local income or franchise Taxes for
        which NorAm or any of its Subsidiaries would be liable, and no material
        deficiency for any such income or franchise Taxes has been proposed,
        asserted or assessed pursuant to such examination against NorAm or any
        of its Subsidiaries by any federal, state or local taxing authority with
        respect to any period.
 
             (iii) Neither NorAm nor any of its Subsidiaries has executed or
        entered into (or prior to the close of business on the Closing Date will
        execute or enter into) with the IRS or any taxing authority (A) any
        agreement or other document extending or having the effect of extending
        the period for assessments or collection of any federal, state or local
        income or franchise Taxes for which NorAm or any of its Subsidiaries
        would be liable or (B) a closing agreement pursuant to Section 7121 of
        the Code, or any predecessor provision thereof or any similar provision
        of state or local income tax law that relates to the assets or
        operations of NorAm or any of its Subsidiaries.
 
             (iv) Neither NorAm nor any of its Subsidiaries has made an election
        under Section 341(f) of the Code or agreed to have Section 341(f)(2) of
        the Code apply to any disposition of a subsection (f) asset (as such
        term is defined in Section 341(f)(4) of the Code) owned by NorAm or any
        of its Subsidiaries.
 
                                       16
<PAGE>   120
 
             (v) Except as set forth in the NorAm SEC Documents, neither NorAm
        nor any of its Subsidiaries is a party to, is bound by or has any
        obligation under any tax sharing agreement or similar agreement or
        arrangement.
 
          For purposes of this Agreement, "Taxes" shall mean any federal, state,
     county, local or foreign taxes, charges, fees, levies or other assessments,
     including, without limitation, all net income, gross income, sales and use,
     ad valorem, transfer, gains, profits, excise, franchise, real and personal
     property, gross receipts, capital stock, production, business and
     occupation, disability, employment, payroll, license, estimated, stamp,
     custom duties, severance or withholding taxes or charges imposed by any
     governmental entity, and includes any interest and penalties (civil or
     criminal) on or additions to any such taxes, charges, fees, levies or other
     assessments, and any expenses incurred in connection with the
     determination, settlement or litigation of any liability for any of the
     foregoing.
 
          (l) Employee Matters; ERISA.
 
             (i) Definitions. For purposes of this Agreement, the following
        terms shall have the meanings set forth below:
 
           (A) "NorAm Affiliate" means any Subsidiary of NorAm, and any other
               trade or business, whether or not incorporated, that is under
               common control, or treated as a single employer, with NorAm under
               Section 414(b), (c), (m) or (o) of the Code;
 
           (B) "NorAm Benefit Plan" means each benefit plan, program, policy,
               contract or arrangement described in subsections
               3.1(l)(ii)(A)(1), (2) and (3) below (whether or not terminated);
 
           (C) "NorAm Pension Benefit Plan" means each "employee pension benefit
               plan" (within the meaning of Section 3(2) of ERISA) subject to
               Title IV of ERISA or the minimum funding requirements of Section
               302 of ERISA that is or was maintained or contributed to by NorAm
               or any NorAm Affiliate at any time during the six calendar year
               period immediately preceding the date hereof;
 
           (D) "ERISA" means the Employee Retirement Income Security Act of
               1974, as amended;
 
           (E) "PBGC" means the Pension Benefit Guaranty Corporation; and
 
           (F) "Reportable Event" means an event constituting a "reportable
               event" within the meaning of Section 4043(c) of ERISA for which
               the 30-day notice requirement or penalty has not been waived by
               the PBGC.
 
             (ii) Benefit Plans.
 
           (A) Section 3.1(l)(ii)(A) of the NorAm Disclosure Schedule contains a
               true and complete list, as of the date hereof, of each item
               described below, whether formal or informal, written or
               unwritten, legally binding or not:
 
               (1) each "employee benefit plan" within the meaning of Section
                   3(3) of ERISA that is or was maintained or contributed to at
                   any time during the six calendar year period immediately
                   preceding the date hereof by NorAm or any NorAm Affiliate and
                   each similar plan, program, policy or arrangement maintained
                   for non-employee directors or other non-employees who have
                   provided services to NorAm or any NorAm Affiliate;
 
               (2) each plan, program, policy, payroll practice or arrangement
                   not listed in (1) above that provides for bonuses,
                   profit-sharing, incentive compensation, deferred
                   compensation, equity-based compensation (including stock
                   options or other stock purchases, restricted stock, stock
                   appreciation rights, performance units and dividend
                   equivalents), holiday pay, vacation pay, sick pay, dependent
                   care benefits, flexible benefits (including any cafeteria
                   plan governed by Section 125 of the Code), paid or
 
                                       17
<PAGE>   121
 
                   unpaid leave (including sick leave, parental leave, military
                   leave and bereavement leave), tuition assistance, relocation
                   or any similar type of benefits, that has been adopted or
                   implemented by NorAm or any NorAm Affiliate (including any
                   such plan, program, policy or arrangement that has been
                   terminated before the date hereof, if NorAm or any NorAm
                   Affiliate could have statutory or contractual liability with
                   respect to the arrangement on or after the date hereof); and
 
               (3) each employment contract, severance contract, parachute
                   agreement, option agreement, stock appreciation right
                   agreement, bonus or other incentive award agreement, deferred
                   compensation agreement, supplemental benefit agreement, split
                   dollar agreement or other personal service or benefit
                   contract or arrangement with or covering a current or former
                   officer, director, employee or independent contractor of
                   NorAm or any NorAm Affiliate.
 
           (B) With respect to each NorAm Benefit Plan, Section 3.1(l)(ii)(B) of
               the NorAm Disclosure Schedule fully and accurately identifies the
               source or sources of benefit payments under the plan (including,
               where applicable, the identity of any trust (whether or not a
               grantor trust), insurance contract, custodial account, agency
               agreement or other arrangement that holds the assets of, or
               serves as a funding vehicle or source of benefits for, such NorAm
               Benefit Plan).
 
             (iii) Contributions. All material contributions and other material
        payments required to have been made by NorAm or any NorAm Affiliate
        under Section 412 of the Code or pursuant to any NorAm Benefit Plan (or
        to any person pursuant to the terms thereof) have been timely made or
        will be timely made in accordance with Section 404(a)(6) of the Code and
        all such amounts properly accrued through the date of this Agreement
        have been reflected in the financial statements of NorAm included in
        NorAm's Annual Report on Form 10-K for the fiscal year ended December
        31, 1995.
 
           (iv) Qualification; Compliance.
 
           (A) Each NorAm Benefit Plan that is intended to be "qualified" within
               the meaning of Section 401(a) of the Code (1) to the knowledge of
               NorAm, currently meets all qualification requirements under the
               Code both in form and in operation and (2) has received a
               favorable determination letter from the IRS on its qualification
               or application for such a determination has been made prior to
               the expiration of the applicable remedial amendment period and
               NorAm agrees to make such plan amendments as the IRS may require
               in order to issue a favorable determination letter.
 
           (B) To the knowledge of NorAm, NorAm and each NorAm Affiliate are in
               compliance with, and each NorAm Benefit Plan is and has been
               operated in compliance with, all applicable laws, rules and
               regulations governing such plan, including, without limitation,
               ERISA and the Code, except for violations that could not have a
               Material Adverse Effect on NorAm. All amendments and actions
               required to bring each of the NorAm Benefit Plans into conformity
               with all of the applicable provisions of ERISA and the Code and
               other applicable legal requirements have been made or taken
               except to the extent that such amendments or actions are not
               required by law to be made or taken until a date after the
               Effective Time.
 
           (C) To the knowledge of NorAm, each NorAm Benefit Plan or related
               trust that is or was intended to satisfy the requirements of
               Section 125, 401(k) or 501(c)(9) of the Code has met and
               continues to meet all material requirements under the applicable
               section of the Code.
 
           (D) To the knowledge of NorAm, no individual or entity has engaged in
               any transaction in connection with which NorAm or any NorAm
               Affiliate, or any NorAm Benefit Plan or any trust, trustee or
               administrator thereof, could be subject to liability pursuant to
               Section 409
 
                                       18
<PAGE>   122
 
               or Section 502 of ERISA, or subject to an excise tax pursuant to
               Section 4975 of the Code, which could in either case have a
               Material Adverse Effect on NorAm.
 
           (E) To the knowledge of NorAm:
 
               (1) no NorAm Benefit Plan is subject to any ongoing audit,
                   investigation or other administrative proceeding of the IRS,
                   the Department of Labor or any other Governmental Entity or
                   is scheduled to be subject to such an audit, investigation or
                   proceeding; and
 
               (2) no NorAm Benefit Plan is the subject of any pending
                   application for administrative relief under any voluntary
                   compliance program of any Governmental Entity (including,
                   without limitation, the IRS' Voluntary Compliance Resolution
                   Program or Walk-in Closing Agreement Program, or the
                   Department of Labor's Delinquent Filer Voluntary Compliance
                   Program).
 
           (v) Liabilities.
 
           (A) Pension Benefit Plans. With respect to the NorAm Pension Benefit
               Plans, individually and in the aggregate, no termination or
               partial termination of any NorAm Pension Benefit Plan or other
               event has occurred, and, to the knowledge of NorAm, there exists
               no condition or set of circumstances that could subject NorAm or
               any NorAm Affiliate to any liability arising under the Code,
               ERISA or any other applicable law (including, without limitation,
               any liability to or under any such plan or to the PBGC, or under
               any indemnity agreement to which NorAm or any NorAm Affiliate is
               a party), which liability could have a Material Adverse Effect on
               NorAm (excluding liability for benefit claims and funding
               obligations payable in the ordinary course and liability for PBGC
               insurance premiums payable in the ordinary course).
 
           (B) Insurance Policies. With respect to each NorAm Benefit Plan that
               is funded wholly or partially through an insurance policy, there
               will be no liability of NorAm or any NorAm Affiliate, which could
               have a Material Adverse Effect on NorAm, in the nature of a
               retroactive rate adjustment, loss sharing arrangement or other
               actual or contingent liability under such policy and arising
               wholly or partially out of events occurring prior to the
               Effective Time.
 
             (vi) Welfare Plans. (A) No NorAm Benefit Plan that is a "welfare
        plan" (within the meaning of Section 3(1) of ERISA) provides benefits
        for any retired or former employees (other than as required pursuant to
        Section 601 of ERISA) and (B) to the knowledge of NorAm, no
        circumstances exist that could subject NorAm or any NorAm Affiliate to
        an excise tax under Section 4976 of the Code.
 
             (vii) Documents Made Available. NorAm has made available to HII a
        true and correct copy of each collective bargaining agreement to which
        NorAm or any NorAm Affiliate is a party or under which NorAm has
        obligations; and, with respect to each NorAm Benefit Plan, NorAm has
        made available to HII a true and correct copy of each of the following,
        as applicable:
 
           (A) the current plan document (including all amendments adopted since
               the most recent restatement) and its most recently prepared
               summary plan description and all summaries of material
               modifications prepared since the most recent summary plan
               description, and all material employee communications relating to
               such plan;
 
           (B) annual reports or Code Section 6039D information returns (IRS
               Form 5500 Series), including financial statements, for the last
               three years;
 
           (C) all contracts relating to any plan with respect to which NorAm or
               any NorAm Affiliate may have any liability, including, without
               limitation, each related trust agreement,
 
                                       19
<PAGE>   123
 
               insurance contract, service provider contract, subscription or
               participation agreement, or investment management agreement
               (including all amendments to each such document);
 
           (D) the most recent IRS determination letter or other opinion letter
               with respect to the qualified status under Code Section 401(a) of
               such plan or under Code Section 501(c)(9) of the related trust;
               and
 
           (E) actuarial reports or valuations for the last three years.
 
             (viii) Payments Resulting From Merger. The consummation or
        announcement of any transaction contemplated by this Agreement will not
        (either alone or upon the occurrence of any additional or further acts
        or events) result in any:
 
           (A) payment (whether of severance pay or otherwise) becoming due from
               HII, any HII Affiliate (as defined in Section 3.2(l)(i)), NorAm
               or any NorAm Affiliate to any current or former officer,
               director, employee or independent contractor of NorAm or any
               NorAm Affiliate or to the trustee under any "rabbi trust" or
               other funding arrangement; or
 
           (B) benefit under any NorAm Benefit Plan being established or
               increased or becoming accelerated, vested or payable, except for
               a payment or benefit that would have been payable under the same
               terms and conditions without regard to the transactions
               contemplated by this Agreement.
 
             (ix) Funded Status of Plans. (A) Each NorAm Pension Benefit Plan
        has assets that, as of January 1, 1996, have a fair market value equal
        to or exceeding the present value of the accrued benefit obligations
        thereunder on a termination basis, as of January 1, 1996, based on the
        actuarial methods, tables and assumptions theretofore utilized by such
        plan's actuary in preparing such plan's most recently prepared FAS 87
        actuarial valuation report and provided by NorAm to HII, and NorAm is
        not aware of any existing facts or circumstances that would materially
        change the funded status of any NorAm Pension Benefit Plan and (B) no
        NorAm Pension Benefit Plan has incurred any "accumulated funding
        deficiency" (within the meaning of Section 302 of ERISA or Section 412
        of the Code).
 
             (x) Multiemployer Plans.
 
           (A) No NorAm Benefit Plan is or was a "multiemployer plan" (within
               the meaning of Section 4001(a)(3) of ERISA), a multiple employer
               plan described in Section 413(c) of the Code or a "multiple
               employer welfare arrangement" (within the meaning of Section
               3(40) of ERISA); and none of NorAm or any NorAm Affiliate has
               been obligated to contribute to, or otherwise has or has had any
               liability with respect to, any multiemployer plan, multiple
               employer plan, or multiple employer welfare arrangement.
 
           (B) With respect to any NorAm Benefit Plan that is listed in Section
               3.1(l)(x)(A) of the NorAm Disclosure Schedule as a multiemployer
               plan, neither NorAm nor any NorAm Affiliate has made or incurred
               a "complete withdrawal" or a "partial withdrawal," as such terms
               are defined in Sections 4203 and 4205 of ERISA, therefrom at any
               time during the six calendar year period immediately preceding
               the date of this Agreement and the transactions contemplated by
               the Agreement will not, in and of themselves, give rise to such a
               "complete withdrawal" or "partial withdrawal."
 
             (xi) Modification or Termination of Plans. Neither NorAm nor any
        NorAm Affiliate is subject to any legal, contractual, equitable or other
        obligation (nor have they any formal plan or commitment, whether legally
        binding or not) to enter into any form of compensation or employment
        agreement or to establish any employee benefit plan of any nature,
        including (without limitation) any pension, profit sharing, welfare,
        post-retirement welfare, stock option, stock or cash award, non-
        qualified deferred compensation or executive compensation plan, policy
        or practice or to modify or change any existing NorAm Benefit Plan.
        NorAm or one or more NorAm Affiliates have the right to, in any manner,
        and without the consent of any employee, beneficiary or dependent,
        employees'
 
                                       20
<PAGE>   124
 
        organization or other person, terminate, modify or amend any NorAm
        Benefit Plan (or their participation in any such NorAm Benefit Plan) at
        any time sponsored, maintained or contributed to by NorAm or any NorAm
        Affiliate, effective as of any date before, on or after the Effective
        Time except to the extent that any retroactive amendment would be
        prohibited by Section 204(g) of ERISA or would adversely affect a vested
        accrued benefit or a previously granted award under any such plan not
        subject to Section 204(g) of ERISA.
 
             (xii) Reportable Events; Claims.
 
           (A) No Reportable Event has occurred with respect to any NorAm
               Pension Benefit Plan that could have a Material Adverse Effect on
               NorAm, and
 
           (B) no liability, claim, action or litigation exists, has been made,
               commenced or, to the knowledge of NorAm, threatened, by or
               against NorAm or any NorAm Affiliate with respect to any NorAm
               Benefit Plan (other than for benefits or PBGC premiums payable in
               the ordinary course) that could have a Material Adverse Effect on
               NorAm.
 
          (m) Labor Matters. Except as set forth in the NorAm SEC Documents:
 
             (i) neither NorAm nor any of its Subsidiaries is a party to any
        collective bargaining agreement or other current labor agreement with
        any labor union or organization, and there is no current union
        representation question involving employees of NorAm or any of its
        Subsidiaries, nor does NorAm or any of its Subsidiaries know of any
        activity or proceeding of any labor organization (or representative
        thereof) or employee group (or representative thereof) to organize any
        such employees;
 
             (ii) there is no unfair labor practice charge or grievance arising
        out of a collective bargaining agreement or other grievance procedure
        against NorAm or any of its Subsidiaries pending, or, to the knowledge
        of NorAm or any of its Subsidiaries, threatened, that has, or could
        have, a Material Adverse Effect on NorAm;
 
             (iii) there is no complaint, lawsuit or proceeding in any forum by
        or on behalf of any present or former employee, any applicant for
        employment or any classes of the foregoing alleging breach of any
        express or implied contract of employment, any law or regulation
        governing employment or the termination thereof or other discriminatory,
        wrongful or tortious conduct in connection with the employment
        relationship against NorAm or any of its Subsidiaries pending, or, to
        the knowledge of NorAm or any of its Subsidiaries, threatened, that has,
        or could have, a Material Adverse Effect on NorAm;
 
             (iv) there is no strike, dispute, slowdown, work stoppage or
        lockout pending, or, to the knowledge of NorAm or any of its
        Subsidiaries, threatened, against or involving NorAm or any of its
        Subsidiaries that has, or could have, a Material Adverse Effect on
        NorAm;
 
             (v) NorAm and each of its Subsidiaries are in compliance with all
        applicable laws respecting employment and employment practices, terms
        and conditions of employment, wages, hours of work and occupational
        safety and health, except for non-compliance that does not have, and
        could not have, a Material Adverse Effect on NorAm; and
 
             (vi) there is no proceeding, claim, suit, action or governmental
        investigation pending or, to the knowledge of NorAm or any of its
        Subsidiaries, threatened, in respect to which any current or former
        director, officer, employee or agent of NorAm or any of its Subsidiaries
        is or may be entitled to claim indemnification from NorAm or any of its
        Subsidiaries pursuant to their respective charters or bylaws, as
        provided in any indemnification agreement to which NorAm or any
        Subsidiary of NorAm is a party or pursuant to applicable law that has,
        or could have, a Material Adverse Effect on NorAm.
 
          (n) Intangible Property. NorAm and its Subsidiaries possess or have
     adequate rights to use all material trademarks, trade names, patents,
     service marks, brand marks, brand names, computer
 
                                       21
<PAGE>   125
 
     programs, databases, industrial designs and copyrights necessary for the
     operation of the businesses of each of NorAm and its Subsidiaries
     (collectively, the "NorAm Intangible Property"), except where the failure
     to possess or have adequate rights to use such properties would not
     reasonably be expected to have a Material Adverse Effect on NorAm. All of
     the NorAm Intangible Property is owned by NorAm or its Subsidiaries free
     and clear of any and all liens, claims or encumbrances, except those that
     are not reasonably likely to have a Material Adverse Effect on NorAm, and
     neither NorAm nor any such Subsidiary has forfeited or otherwise
     relinquished any NorAm Intangible Property which forfeiture would result in
     a Material Adverse Effect. To the knowledge of NorAm, the use of the NorAm
     Intangible Property by NorAm or its Subsidiaries does not, in any material
     respect, conflict with, infringe upon, violate or interfere with or
     constitute an appropriation of any right, title, interest or goodwill,
     including, without limitation, any intellectual property right, trademark,
     trade name, patent, service mark, brand mark, brand name, computer program,
     database, industrial design, copyright or any pending application therefor
     of any other person and there have been no claims made and neither NorAm
     nor any of its Subsidiaries has received any notice of any claim or
     otherwise knows that any of the NorAm Intangible Property is invalid or
     conflicts with the asserted rights of any other person or has not been used
     or enforced or has been failed to be used or enforced in a manner that
     would result in the abandonment, cancellation or unenforceability of any of
     the NorAm Intangible Property, except for any such conflict, infringement,
     violation, interference, claim, invalidity, abandonment, cancellation or
     unenforceability that would not reasonably be expected to have a Material
     Adverse Effect on NorAm.
 
          (o) Environmental Matters.
 
             (i) For purposes of this Agreement:
 
           (A) "Environmental Claims" means, with respect to any person, (x) any
               and all administrative, regulatory or judicial actions, suits,
               demands, demand letters, directives, claims, liens,
               investigations, proceedings or notices of non-compliance or
               violation in writing by or from any person or entity (including
               any Governmental Entity), or (y) any oral information provided by
               a Governmental Entity that written action of the type described
               in the foregoing clause is in process, which (in case of either
               (x) or (y)) alleges potential liability (including, without
               limitation, potential liability for enforcement, investigatory
               costs, cleanup costs, governmental response costs, removal costs,
               remedial costs, natural resources damages, property damages,
               personal injuries or penalties) arising out of, based on or
               resulting from (1) the presence, or Release (as hereinafter
               defined) or threatened Release into the environment, of any
               Hazardous Materials (as hereinafter defined) at any location,
               whether or not owned, operated, leased or managed by NorAm or any
               of its Subsidiaries (for purposes of Section 3.1(o)) or by HII or
               any of its Subsidiaries (for purposes of Section 3.2(o)), (2)
               circumstances forming the basis of any violation, or alleged
               violation, of any Environmental Law (as hereinafter defined) or
               (3) any and all claims by any third party seeking damages,
               contribution, indemnification, cost recovery, compensation or
               injunctive relief resulting from the presence or Release of any
               Hazardous Materials.
 
           (B) "Environmental Laws" means all federal, state and local laws,
               rules, regulations and guidances relating to pollution or the
               protection of human health or the environment (including, without
               limitation, ambient air, surface water, groundwater, land surface
               or subsurface strata), including, without limitation, laws and
               regulations relating to Releases or threatened Releases of
               Hazardous Materials or otherwise relating to the manufacture,
               processing, distribution, use, treatment, storage, disposal,
               transport or handling of Hazardous Materials.
 
           (C) "Hazardous Materials" means (x) any petroleum or petroleum
               products, radioactive materials, asbestos in any form that is or
               could become friable, urea formaldehyde foam insulation and
               transformers or other equipment that contain dielectric fluid
               containing polychlorinated biphenyls, (y) any chemicals,
               materials or substances which are now
 
                                       22
<PAGE>   126
 
               defined as or included in the definition of "hazardous
               substances," "hazardous wastes," "hazardous materials,"
               "extremely hazardous wastes," "restricted hazardous wastes,"
               "toxic substances" or "toxic pollutants," or words of similar
               import, under any Environmental Law and (z) any other chemical,
               material, substance or waste, exposure to which is now
               prohibited, limited or regulated under any Environmental Law in a
               jurisdiction in which NorAm or any of its Subsidiaries operates
               (for purposes of Section 3.1(o)) or in which HII or any of its
               Subsidiaries operates (for purposes of Section 3.2(o)).
 
           (D) "Release" means any release, spill, emission, leaking, injection,
               deposit, disposal, discharge, dispersal, leaching or migration
               into the atmosphere, soil, subsurface, surface water, groundwater
               or property.
 
           (ii) Compliance.
 
           (A) Except as set forth in the NorAm SEC Documents, NorAm and each of
               its Subsidiaries is in compliance with all applicable
               Environmental Laws, except where the failure to be so in
               compliance would not be reasonably likely to have a Material
               Adverse Effect on NorAm.
 
           (B) Except as set forth in the NorAm SEC Documents, neither NorAm nor
               any of its Subsidiaries has received any written communication
               from any person or Governmental Entity that alleges that NorAm or
               any of its Subsidiaries is not in compliance with applicable
               Environmental Laws, except where the failure to be so in
               compliance would not be reasonably likely to have a Material
               Adverse Effect on NorAm.
 
             (iii) Environmental Permits. Except as set forth in the NorAm SEC
        Documents, NorAm and each of its Subsidiaries has obtained or applied
        for all environmental, health and safety permits and authorizations
        (collectively, "Environmental Permits") necessary for the construction
        of their facilities and the conduct of their operations, and all such
        permits are in good standing or, where applicable, a renewal application
        has been timely filed, is pending and agency approval is expected to be
        obtained, and NorAm and its Subsidiaries are in compliance with all
        terms and conditions of all such Environmental Permits and are not
        required to make any expenditure in order to obtain or renew any
        Environmental Permits, except where the failure to obtain or be in
        compliance with such Environmental Permits and the requirement to make
        such expenditures would not be reasonably likely to have a Material
        Adverse Effect on NorAm.
 
             (iv) Environmental Claims. Except as set forth in the NorAm SEC
        Documents, there is no Environmental Claim pending or, to the knowledge
        of NorAm and its Subsidiaries, threatened
 
           (A) against NorAm or any of its Subsidiaries,
 
           (B) against any person or entity whose liability for any
               Environmental Claim NorAm or any of its Subsidiaries has retained
               or assumed, either contractually or by operation of law, or
 
           (C) against any real or personal property or operations that NorAm or
               any of its Subsidiaries owns, leases or manages, in whole or in
               part,
 
        that, if adversely determined, would be reasonably likely to have a
        Material Adverse Effect on NorAm.
 
             (v) Releases. Except as set forth in the NorAm SEC Documents, and
        except for Releases of Hazardous Materials the liability for which would
        not be reasonably likely to have a Material Adverse Effect on NorAm,
        NorAm has no knowledge of any Release of any Hazardous Materials that
        has occurred on any of the properties owned, leased or occupied by NorAm
        or any Subsidiary of NorAm or any predecessor of NorAm or any Subsidiary
        of NorAm which requires investigation, assessment, monitoring,
        remediation or cleanup under Environmental Laws.
 
             (vi) Disclosure. NorAm has disclosed to HII all material facts that
        NorAm reasonably believes form the basis of a Material Adverse Effect on
        NorAm arising from the cost of pollution control equipment currently
        required or known to be required in the future, current remediation
 
                                       23
<PAGE>   127
 
        costs or remediation costs known to be required in the future, or any
        other environmental matter affecting NorAm or its Subsidiaries that
        would have a Material Adverse Effect on NorAm.
 
          (p) Insurance. NorAm has delivered to HII an insurance schedule of
     NorAm's and each of its Subsidiaries' directors' and officers' liability
     insurance, primary and excess casualty insurance policies, providing
     coverage for bodily injury and property damage to third parties, including
     products liability and completed operations coverage, and worker's
     compensation, in effect as of the date hereof. NorAm maintains insurance
     coverage as is customary for the business of NorAm and each of its
     Subsidiaries (taking into account the cost and availability of such
     insurance), and the transactions contemplated hereby will not materially
     adversely affect such coverage.
 
          (q) Contracts. Neither NorAm nor any of its Subsidiaries is a party to
     (i) any agreement under which it provides natural gas transportation,
     gathering, distribution or processing services which provide revenues
     (excluding gas costs) in excess of $5,000,000 per year and may be
     terminated by the other party within 5 years of the date hereof; (ii) any
     gas or power purchase contract which requires NorAm or any of its
     Subsidiaries to take and/or pay for minimum contract volumes at prices
     which exceed, or are expected to exceed, market prices and, at minimum take
     and/or pay levels, in the aggregate would require payment of a premium of
     $2,000,000 over the market price in any of the next 5 years; (iii) any gas
     purchase contract which requires NorAm or any of its Subsidiaries to take
     and/or pay for minimum contract volumes at prices which exceed, or are
     expected to exceed, market prices and contain clauses permitting the seller
     to commit additional properties or reserves to the contract; (iv) any
     agreement relating to prior take or pay payments or to buy-out or buy-down
     gas purchase contract obligations which require NorAm or any of its
     Subsidiaries to reimburse royalty or severance tax which, in the aggregate,
     could require NorAm or any of its Subsidiaries to make future payments
     exceeding $2,000,000 per year; (v) any gas sales contract which provides
     per year more than 5% of NorAm's or 10% of any of its Subsidiaries'
     revenues and which may be terminated by the purchaser within 5 years of the
     date hereof; (vi) any gas or power supply, marketing, transportation or
     storage contract which provides revenues in excess of $10,000,000 per month
     and has a term greater than one year; or (vii) any fixed-price gas or power
     supply or marketing contract (other than (A) gas contracts involving a
     volume less than 1,000 Mcf per day or (B) gas purchase contracts with a
     price less than $2.00 per Mcf), or any swap, hedging or derivative
     agreement or instrument, which has a term greater than one year. The
     contract summaries which NorAm has provided to HII prior to the date hereof
     are accurate and do not omit to include any material terms necessary to
     make the summary thereof not misleading in all material respects. All gas
     or power contracts which require NorAm or any of its Subsidiaries to take
     and/or pay for minimum contract volumes at prices which exceed, or are
     expected to exceed, market prices do not, at minimum take and/or pay
     levels, require in the aggregate payment of premiums of more than
     $10,000,000 per year over the market price in any of the next 5 years.
 
          (r) Regulatory Proceedings. Except as set forth in the NorAm SEC
     Documents, neither NorAm nor any of its Subsidiaries all or part of whose
     rates or services are regulated by a Governmental Entity has rates which
     have been or are being collected subject to refund, pending final
     resolution of any proceeding pending before a Governmental Entity or on
     appeal to the courts or is a party to any proceeding before the
     Governmental Entity or on appeal from orders of the Governmental Entity
     which could result in orders having a Material Adverse Effect on NorAm.
 
          (s) Regulation as a Utility.
 
             (i) Neither NorAm nor any of its Subsidiaries is a "holding
        company," a "subsidiary company" or an "affiliate" of any public utility
        company within the meaning of Section 2(a)(7), 2(a)(8) or 2(a)(11) of
        the Public Utility Holding Company Act of 1935, as amended (the "1935
        Act"), respectively, and none of the Subsidiaries of NorAm is a "public
        utility company" within the meaning of Section 2(a)(5) of the 1935 Act.
 
             (ii) NorAm is regulated as a public utility in the States of Texas,
        Arkansas, Minnesota, Louisiana, Oklahoma and Mississippi, and in no
        other state. Neither NorAm nor any "subsidiary company" or "affiliate"
        (as each such term is defined in the 1935 Act) of NorAm is subject to
 
                                       24
<PAGE>   128
 
        regulation as a public utility or public service company (or similar
        designation) by any other state in the United States or any foreign
        country.
 
          (t) Opinion of Financial Advisor. The Board of Directors of NorAm has
     received the opinion of Merrill Lynch, Pierce, Fenner & Smith Incorporated
     ("Merrill Lynch") to the effect that, as of the date on which the Board of
     Directors of NorAm approved this Agreement, the Merger Consideration to be
     received by the holders of NorAm Common Stock pursuant to this Agreement is
     fair from a financial point of view to such holders.
 
          (u) Vote Required. The affirmative vote of the holders of a majority
     of the outstanding shares of NorAm Common Stock is the only vote of the
     holders of any class or series of capital stock of NorAm necessary to
     approve this Agreement, the NorAm Merger and the other transactions
     contemplated hereby.
 
          (v) Beneficial Ownership of HII Common Stock. As of the date hereof,
     assuming the accuracy of the representation set forth in Section 3.2(b),
     neither NorAm nor its Subsidiaries "beneficially owns" (as defined in Rule
     13d-3 under the Exchange Act) any outstanding shares of HII Common Stock.
 
          (w) Brokers. Except for the fees and expenses payable to Merrill
     Lynch, which fees are reflected in its agreement with NorAm (a copy of
     which has been delivered to HII), no broker, investment banker or other
     person is entitled to any broker's, finder's or other similar fee or
     commission in connection with the transactions contemplated by this
     Agreement based upon arrangements made by or on behalf of NorAm.
 
          (x) Article Fifth of NorAm Restated Certificate of Incorporation and
     Section 203 of the DGCL Not Applicable. Neither the provisions of Article
     Fifth of NorAm's Restated Certificate of Incorporation nor the provisions
     of Section 203 of the DGCL will, prior to the consummation of this
     Agreement, assuming the accuracy of the representation contained in Section
     3.2(s), apply to this Agreement, the NorAm Merger or the other transactions
     contemplated hereby.
 
          (y) Change in Control Provisions. The Board of Directors of NorAm has
     taken all actions necessary to render inapplicable to the Mergers (and the
     Alternative Merger and the Second Alternative Merger) and the other
     transactions contemplated by this Agreement the repurchase rights afforded
     to holders of NorAm's 10% Debentures due 2019 (the "NorAm 10% Debentures")
     or to the holders of or trustees under indentures relating to any other
     indebtedness of NorAm or any of its Subsidiaries in the event of a "change
     in control" as defined in the indenture governing the NorAm 10% Debentures
     or similar provisions contained in such other indentures or in any other
     debt agreements of NorAm or any of its Subsidiaries, as the case may be.
 
     3.2  Representations and Warranties of HL&P and HII. HL&P and HII, jointly
and severally, represent and warrant to NorAm as follows, except as set forth in
the disclosure schedule dated as of the date hereof and signed by an authorized
officer of each of HL&P and HII and delivered to NorAm by HL&P and HII on or
prior to the date hereof (the "HII Disclosure Schedule"), each of which
exceptions shall specifically identify the relevant Section hereof to which it
relates:
 
          (a) Organization, Standing and Power. Each of HL&P and HII is a
     corporation duly organized, validly existing and in good standing under the
     laws of the State of Texas, has all requisite power and authority to own,
     lease and operate its properties and to carry on its business as now being
     conducted, and is duly qualified and in good standing to do business in
     each jurisdiction in which the business it is conducting, or the operation,
     ownership or leasing of its properties, makes such qualification necessary,
     other than in such jurisdictions where the failure so to qualify would not
     have a Material Adverse Effect on HII. HL&P and HII have each heretofore
     delivered to NorAm complete and correct copies of their respective Restated
     Articles of Incorporation and Bylaws.
 
          (b) Capital Structure.
 
             (i) As of the date hereof, the authorized capital stock of HL&P
        consists of 1,000 shares of HL&P Class A Common Stock, 100 shares of
        HL&P Class B Common Stock and 10,000,000
 
                                       25
<PAGE>   129
 
        shares of Cumulative Preferred Stock, no par value, of HL&P (the "HL&P
        Preferred Stock"). At the close of business on July 31, 1996: (A) 1,000
        shares of HL&P Class A Common Stock were issued and outstanding; (B) 100
        shares of HL&P Class B Common Stock were issued and outstanding; (C)
        3,804,397 shares of HL&P Preferred Stock were issued and outstanding;
        and (D) no Voting Debt of HL&P was outstanding. All outstanding shares
        of HL&P capital stock are, and the shares of HL&P Common Stock when
        issued in accordance with this Agreement, and upon exercise of the HII
        Stock Options and the NorAm Stock Options to be assumed by HL&P pursuant
        to this Agreement, will be, validly issued, fully paid and nonassessable
        and not subject to preemptive rights. HL&P has no Subsidiaries. Except
        as set forth above, there are outstanding: (A) no shares of capital
        stock, Voting Debt or other voting securities of HL&P; (B) no securities
        of HL&P convertible into or exchangeable for shares of capital stock,
        Voting Debt or other voting securities of HL&P; and (C) no options,
        warrants, calls, rights (including preemptive rights), commitments or
        agreements to which HL&P is a party or by which it is bound in any case
        obligating HL&P to issue, deliver, sell, purchase, redeem or acquire, or
        cause to be issued, delivered, sold, purchased, redeemed or acquired,
        additional shares of capital stock, Voting Debt or other voting
        securities of HL&P or obligating HL&P to grant, extend or enter into any
        such option, warrant, call, right, commitment or agreement. There are
        not as of the date hereof and there will not be at the Effective Time
        any stockholder agreements, voting trusts or other agreements or
        understandings to which HL&P is a party or by which it is bound relating
        to the voting of any shares of the capital stock of HL&P.
 
             (ii) As of the date hereof, the authorized capital stock of HII
        consists of 400,000,000 shares of HII Common Stock and 10,000,000 shares
        of Cumulative Preferred Stock, no par value, of HII (the "HII Preferred
        Stock"). At the close of business on July 31, 1996, (A) 261,352,547
        shares of HII Common Stock were issued and outstanding and not more than
        46,098,546 shares of HII Common Stock were reserved for issuance
        pursuant to HII's:
 
<TABLE>
        <S>                                                                <C>
        Long-Term Incentive Compensation Plan..........................       630,375
        1994 Long-Term Incentive Compensation Plan.....................     3,999,362
        Stock Benefit Plan.............................................       189,804
        Stock Plan for Outside Directors...............................        94,500
        Houston Industries Energy, Inc. Long-Term Project Incentive
          Compensation Plan............................................       470,650
        Savings Plan...................................................    33,162,041
        Investor's Choice Plan.........................................     7,551,814
</TABLE>
 
        (collectively, the "HII Stock Plans"); (B) 1,395,900 shares of HII
        Common Stock were held by HII in its treasury or by its wholly owned
        Subsidiaries; (C) no shares of HII Preferred Stock are issued and
        outstanding and 2,000,000 shares of HII Series A Preference Stock were
        reserved for issuance in connection with the HII Stock Purchase Rights;
        and (D) no Voting Debt of HII was outstanding. All outstanding shares of
        HII capital stock are validly issued, fully paid and nonassessable and
        not subject to preemptive rights. All outstanding shares of capital
        stock of the Subsidiaries of HII are owned by HII or a direct or
        indirect wholly owned Subsidiary of HII, free and clear of all liens,
        charges, encumbrances, claims and options of any nature. Except as set
        forth above and except for changes since July 31, 1996 resulting from
        the exercise of employee stock options granted pursuant to, or from
        issuances or purchases under, the HII Stock Plans, or as contemplated by
        this Agreement, there are outstanding: (A) no shares of capital stock,
        Voting Debt or other voting securities of HII; (B) no securities of HII
        or any Subsidiary of HII convertible into or exchangeable for shares of
        capital stock, Voting Debt or other voting securities of HII or any
        Subsidiary of HII; and (C) no options, warrants, calls, rights
        (including preemptive rights), commitments or agreements to which HII or
        any Subsidiary of HII is a party or by which it is bound in any case
        obligating HII or any Subsidiary of HII to issue, deliver, sell,
        purchase, redeem or acquire, or cause to be issued, delivered, sold,
        purchased, redeemed or acquired, additional shares of capital stock or
        any Voting Debt or other voting securities of HII or of any Subsidiary
        of HII or obligating HII or any Subsidiary of HII to grant, extend or
        enter into any such option, warrant, call, right, commitment or
 
                                       26
<PAGE>   130
 
        agreement. There are not as of the date hereof and there will not be at
        the HII/HL&P Merger Effective Time any stockholder agreements, voting
        trusts or other agreements or understandings to which HII is a party or
        by which it is bound relating to the voting of any shares of the capital
        stock of HII.
 
          (c) Authority; No Violations; Consents and Approvals.
 
             (i) Each of HL&P and HII has all requisite corporate power and
        authority to enter into this Agreement and, subject, with respect to
        consummation of the Mergers, to approval of this Agreement and the
        issuance of the HL&P Common Stock pursuant to the Mergers (collectively,
        the "HII Vote Matter") by the shareholders of HII in accordance with the
        TBCA and the NYSE listing requirements, to consummate the transactions
        contemplated hereby. The execution and delivery of this Agreement and
        the consummation of the transactions contemplated hereby, including, but
        not limited to, the issuance of the HL&P Common Stock pursuant to the
        Mergers, have been duly authorized by all necessary corporate action on
        the part of HL&P and HII, subject, with respect to consummation of the
        Mergers, to approval of the HII Vote Matter by the shareholders of HII
        in accordance with the TBCA and NYSE listing requirements. This
        Agreement has been duly executed and delivered by HL&P and HII and,
        subject, with respect to consummation of the Mergers, to approval of the
        HII Vote Matter by the shareholders of HII in accordance with the TBCA
        and NYSE listing requirements, and assuming this Agreement constitutes
        the valid and binding obligation of NorAm, constitutes a valid and
        binding obligation of HL&P and HII enforceable in accordance with its
        terms, subject, as to enforceability, to bankruptcy, insolvency,
        reorganization and other laws of general applicability relating to or
        affecting creditors' rights and to general principles of equity.
 
             (ii) The execution and delivery of this Agreement does not, and the
        consummation of the transactions contemplated hereby and compliance with
        the provisions hereof will not, conflict with, or result in any
        violation of, or default (with or without notice or lapse of time, or
        both) under, or give rise to a right of termination, cancellation or
        acceleration of any obligation or to the loss of a material benefit
        under, or result in the creation of any lien, security interest, charge
        or encumbrance upon any of the properties or assets of HII or any of its
        Subsidiaries under, any provision of (A) the Restated Articles of
        Incorporation or Bylaws of HII or any provision of the comparable
        charter or organizational documents of any of its Subsidiaries, (B)
        subject to obtaining the third-party consents set forth in Section
        3.2(c)(ii) of the HII Disclosure Schedule (the "HII Required Consents"),
        any loan or credit agreement, note, bond, mortgage, indenture, lease or
        other agreement, instrument, permit, concession, franchise or license
        applicable to HII or any of its Subsidiaries or (C) assuming the
        consents, approvals, authorizations or permits and filings or
        notifications referred to in Section 3.2(c)(iii) are duly and timely
        obtained or made and the approval of the HII Vote Matter by the
        shareholders of HII has been obtained, any judgment, order, decree,
        statute, law, ordinance, rule or regulation applicable to HII or any of
        its Subsidiaries or any of their respective properties or assets, other
        than, in the case of clause (B) or (C), any such conflicts, violations,
        defaults, rights, liens, security interests, charges or encumbrances
        that, individually or in the aggregate, would not have a Material
        Adverse Effect on HII, materially impair the ability of HII or HL&P to
        perform its obligations hereunder or thereunder or prevent the
        consummation of any of the transactions contemplated hereby or thereby.
 
             (iii) No consent, approval, order or authorization of, or
        registration, declaration or filing with, or permit from any
        Governmental Entity is required by or with respect to HII or any of its
        Subsidiaries in connection with the execution and delivery of this
        Agreement by HII or HL&P, or the consummation by HII or HL&P of the
        transactions contemplated hereby, as to which the failure to obtain or
        make would have a Material Adverse Effect on HII, except for: (A) the
        filing of a premerger notification report by HII under the HSR Act and
        the expiration or termination of the applicable waiting period with
        respect thereto; (B) the filing with the SEC of the Joint Proxy
        Statement, the S-4, such reports under Section 13(a) of the Exchange Act
        and such other compliance with the Securities Act and the Exchange Act
        and the rules and regulations thereunder
 
                                       27
<PAGE>   131
 
        as may be required in connection with this Agreement and the
        transactions contemplated hereby, and the obtaining from the SEC of such
        orders as may be so required; (C) the filing with the SEC of a Form U-1
        requesting an order from the SEC granting the HII/HL&P Merger Surviving
        Corporation an exemption under section 3(a)(2) of the 1935 Act and/or a
        Form U-3A-2 under the 1935 Act (unless the Alternative Merger or the
        Second Alternative Merger, as the case may be, is effected in lieu of
        the Mergers); (D) the filing of the HII/HL&P Merger Articles of Merger
        with the Secretary of State of the State of Texas and the NorAm Merger
        Certificate of Merger with the Secretary of State of the State of
        Delaware; (E) filings with, and approval of, the NYSE; (F) such filings
        and approvals as may be required by any applicable state securities,
        "blue sky" or takeover laws or environmental laws; and (G) such filings
        and approvals as may be required by any foreign premerger notification,
        securities, corporate or other law, rule or regulation.
 
          (d) SEC Documents. Each of HL&P and HII has made available to NorAm a
     true and complete copy of each report, schedule, registration statement and
     definitive proxy statement filed by HL&P and HII, as the case may be, with
     the SEC since January 1, 1994 and prior to the date of this Agreement (the
     "HL&P SEC Documents" and the "HII SEC Documents," respectively) which are
     all the documents (other than preliminary material) that HL&P or HII have
     been required to file with the SEC since such date. As of their respective
     dates, the HL&P SEC Documents and the HII SEC Documents complied in all
     material respects with the requirements of the Securities Act or the
     Exchange Act, as the case may be, and the rules and regulations of the SEC
     thereunder applicable to such HL&P SEC Documents and HII SEC Documents, and
     none of the HL&P SEC Documents or the HII SEC Documents contained any
     untrue statement of a material fact or omitted to state a material fact
     required to be stated therein or necessary to make the statements therein,
     in light of the circumstances under which they were made, not misleading.
     The financial statements of HL&P contained in the HL&P SEC Documents and
     the financial statements of HII included in the HII SEC Documents complied
     as to form in all material respects with the published rules and
     regulations of the SEC with respect thereto, were prepared in accordance
     with GAAP applied on a consistent basis during the periods involved (except
     as may be indicated in the notes thereto or, in the case of the unaudited
     statements, as permitted by Rule 10-01 of Regulation S-X of the SEC) and
     fairly present in accordance with applicable requirements of GAAP (subject,
     in the case of the unaudited statements, to normal, recurring adjustments,
     none of which will be material) (x) the financial position of HL&P as of
     their respective dates and the results of operations and the cash flows of
     HL&P for the periods presented therein or (y) the consolidated financial
     position of HII and its consolidated Subsidiaries as of their respective
     dates and the consolidated results of operations and the consolidated cash
     flows of HII and its consolidated Subsidiaries for the periods presented
     therein, respectively.
 
          (e) Information Supplied. None of the information supplied or to be
     supplied by HL&P or HII for inclusion or incorporation by reference in the
     S-4 will, at the time the S-4 becomes effective under the Securities Act or
     at the Effective Time, contain any untrue statement of a material fact or
     omit to state any material fact required to be stated therein or necessary
     to make the statements therein not misleading, and none of the information
     supplied or to be supplied by HL&P or HII and included or incorporated by
     reference in the Joint Proxy Statement will, at the date mailed to the
     shareholders of HII and the stockholders of NorAm or at the time of the
     meetings of such shareholders and stockholders to be held in connection
     with the Mergers or at the relevant Effective Time, contain any untrue
     statement of a material fact or omit to state any material fact required to
     be stated therein or necessary in order to make the statements therein, in
     light of the circumstances under which they are made, not misleading. If at
     any time prior to the relevant Effective Time any event with respect to HII
     or any of its Subsidiaries, or with respect to other information supplied
     by HL&P or HII for inclusion in the Joint Proxy Statement or S-4, shall
     occur which is required to be described in an amendment of, or a supplement
     to, the Joint Proxy Statement or the S-4, such event shall be so described,
     and such amendment or supplement shall be promptly filed with the SEC. The
     Joint Proxy Statement, insofar as it relates to HII or the Subsidiaries of
     HII or other information supplied by HL&P or HII for inclusion therein,
     will comply as to form in all material respects with the provisions of the
     Exchange Act and the rules and regulations thereunder.
 
                                       28
<PAGE>   132
 
          (f) Absence of Certain Changes or Events. Except as disclosed in, or
     reflected in the financial statements included in, the HL&P SEC Documents
     or the HII SEC Documents, or except as contemplated by this Agreement,
     since December 31, 1995, there has not been: (i) any declaration, setting
     aside or payment of any dividend or other distribution (whether in cash,
     stock or property) with respect to (x) any shares of HII's capital stock,
     except for regular quarterly cash dividends of $.375 per share on HII
     Common Stock (or a pro rata amount for any dividend less than a full
     quarter) with usual record and payment dates for such dividends or (y) any
     shares of HL&P Preferred Stock, except for regular cash dividends pursuant
     to the terms of such series of HL&P Preferred Stock (or a pro rata amount
     for any dividend less than a full dividend payment period) with usual
     record and payment dates for such dividends or (z) any shares of HL&P Class
     A Common Stock and HL&P Class B Common Stock; (ii) any amendment of any
     material term of any outstanding equity security of HII or any Subsidiary
     of HII; (iii) any repurchase, redemption or other acquisition by HII or any
     Subsidiary of HII of any outstanding shares of capital stock or other
     equity securities of, or other ownership interests in, HII or any
     Subsidiary of HII, except pursuant to HII's previously publicly-announced
     HII Common Stock repurchase program (the "HII Common Stock Repurchase
     Program") or as contemplated by the HII Stock Plans; (iv) any material
     change in any method of accounting or accounting practice by HII or any
     Significant Subsidiary of HII; or (v) any other transaction, commitment,
     dispute or other event or condition (financial or otherwise) of any
     character (whether or not in the ordinary course of business) that could
     have a Material Adverse Effect on HII, except for general economic changes
     and changes that may affect the industries of HII or any of its
     Subsidiaries generally.
 
          (g) No Undisclosed Material Liabilities. As of the date hereof, there
     are no liabilities of HII or any of its Subsidiaries of any kind
     whatsoever, whether accrued, contingent, absolute, determined, determinable
     or otherwise, that are reasonably likely to have a Material Adverse Effect
     on HII, other than: (i) liabilities adequately provided for on the balance
     sheet of HII dated as of March 31, 1996 (including the notes thereto)
     contained in HII's Quarterly Report on Form 10-Q for the quarter ended
     March 31, 1996; and (ii) liabilities under this Agreement.
 
          (h) No Default. Neither HII nor any of its Subsidiaries is in default
     or violation (and no event has occurred which, with notice or the lapse of
     time or both, would constitute a default or violation) of any term,
     condition or provision of (i) their respective charter and bylaws, (ii) any
     note, bond, mortgage, indenture, license, agreement or other instrument or
     obligation to which HII or any of its Subsidiaries is now a party or by
     which HII or any of its Subsidiaries or any of their respective properties
     or assets may be bound (except for the requirement under certain of such
     instruments to file supplemental indentures as a result of the transactions
     contemplated hereby) or (iii) any order, writ, injunction, decree, statute,
     rule or regulation applicable to HII or any of its Subsidiaries, except in
     the case of (ii) and (iii) for defaults or violations which in the
     aggregate would not have a Material Adverse Effect on HII.
 
          (i) Compliance with Applicable Laws. HII and its Subsidiaries hold all
     permits, licenses, variances, exemptions, orders, franchises and approvals
     of all Governmental Entities necessary for the lawful conduct of their
     respective businesses (the "HII Permits"), except where the failure so to
     hold would not have a Material Adverse Effect on HII. HII and its
     Subsidiaries are in compliance with the terms of the HII Permits, except
     where the failure so to comply would not have a Material Adverse Effect on
     HII. Except as disclosed in the HL&P SEC Documents or the HII SEC
     Documents, the businesses of HII and its Subsidiaries are not being
     conducted in violation of any law, ordinance or regulation of any
     Governmental Entity, except for possible violations which would not have a
     Material Adverse Effect on HII. As of the date of this Agreement, no
     investigation or review by any Governmental Entity with respect to HII or
     any of its Subsidiaries is pending or, to the best knowledge of HII,
     threatened, other than those the outcome of which would not have a Material
     Adverse Effect on HII.
 
          (j) Litigation. Except as disclosed in the HL&P SEC Documents or the
     HII SEC Documents, there is no suit, action or proceeding pending, or, to
     the best knowledge of HII, threatened against or affecting HII or any
     Subsidiary of HII ("HII Litigation"), and HII and its Subsidiaries have no
     knowledge of any facts that are likely to give rise to any HII Litigation,
     that (in any case) is reasonably likely to have a Material Adverse Effect
     on HII, nor is there any judgment, decree, injunction, rule or
 
                                       29
<PAGE>   133
 
     order of any Governmental Entity or arbitrator outstanding against HII or
     any Subsidiary of HII ("HII Order") that is reasonably likely to have a
     Material Adverse Effect on HII or its or HL&P's ability to consummate the
     transactions contemplated by this Agreement.
 
          (k) Taxes. Except as would not, individually or in the aggregate, have
     a Material Adverse Effect on HII:
 
             (i) Each of HII, each of its Subsidiaries and any affiliated,
        combined or unitary group of which any such corporation is or was a
        member has (A) timely filed all federal income tax and all other
        material federal and all material state, local and foreign Returns
        required to be filed or sent by or with respect to it in respect of any
        Taxes, (B) timely paid all Taxes that are due and payable (except for
        audit adjustments not material in the aggregate or to the extent that
        liability therefor is reserved for in HII's most recent audited
        financial statements) for which HII or any of its Subsidiaries may be
        liable, (C) established reserves that are adequate for the payment of
        all Taxes not yet due and payable with respect to the results of
        operations of HII and its Subsidiaries through the date hereof and (D)
        to the knowledge of HII or any Subsidiary of HII, complied in all
        material respects with all applicable laws, rules and regulations
        relating to the payment and withholding of Taxes, and has in all
        material respects timely withheld from employee wages and paid over to
        the proper governmental authorities all amounts required to be so
        withheld and paid over.
 
             (ii) Section 3.2(k)(ii) of the HII Disclosure Schedule sets forth
        the last taxable period through which the federal income tax Returns of
        HII and any of its Subsidiaries have been examined by the IRS or
        otherwise closed. Except to the extent being contested in good faith,
        all deficiencies asserted as a result of such examinations and any
        examination by any applicable state or local taxing authority have been
        paid, fully settled or adequately provided for in HII's most recent
        audited financial statements. Except as adequately provided for in the
        HL&P SEC Documents or the HII SEC Documents, as the case may be, no
        material federal, state or local income or franchise tax audits or other
        administrative proceedings or court proceedings are presently pending
        with regard to any federal, state or local income or franchise Taxes for
        which HII or any of its Subsidiaries would be liable, and no material
        deficiency for any such income or franchise Taxes has been proposed,
        asserted or assessed pursuant to such examination against HII or any of
        its Subsidiaries by any federal, state or local taxing authority with
        respect to any period.
 
             (iii) Neither HII nor any of its Subsidiaries has executed or
        entered into (or prior to the close of business on the Closing Date will
        execute or enter into) with the IRS or any taxing authority (A) any
        agreement or other document extending or having the effect of extending
        the period for assessments or collection of any federal, state or local
        income or franchise Taxes for which HII or any of its Subsidiaries would
        be liable or (B) a closing agreement pursuant to Section 7121 of the
        Code, or any predecessor provision thereof or any similar provision of
        state or local income tax law that relates to the assets or operations
        of HII or any of its Subsidiaries.
 
             (iv) Neither HII nor any of its Subsidiaries has made an election
        under Section 341(f) of the Code or agreed to have Section 341(f)(2) of
        the Code apply to any disposition of a subsection (f) asset (as such
        term is defined in Section 341(f)(4) of the Code) owned by HII or any of
        its Subsidiaries.
 
             (v) Except as set forth in the HL&P SEC Documents or the HII SEC
        Documents, as the case may be, neither HII nor any of its Subsidiaries
        is a party to, is bound by or has any obligation under any tax sharing
        agreement or similar agreement or arrangement.
 
          (l) Employee Matters; ERISA.
 
             (i) For purposes of this Agreement, "HII Benefit Plan" means:
 
             (A) each "employee benefit plan" within the meaning of Section 3(3)
                 of ERISA that is or was maintained or contributed to at any
                 time during the six calendar year period immediately preceding
                 the date hereof by HII or any HII Affiliate and each similar
                 plan, program,
 
                                       30
<PAGE>   134
 
               policy or arrangement maintained for non-employee directors or
               other non-employees who have provided services to HII or any HII
               Affiliate;
 
           (B) each plan, program, policy, payroll practice or arrangement not
               listed in (A) above that provides for bonuses, profit-sharing,
               incentive compensation, deferred compensation, equity-based
               compensation (including stock options or other stock purchases,
               restricted stock, stock appreciation rights, performance units
               and dividend equivalents), holiday pay, vacation pay, sick pay,
               dependent care benefits, flexible benefits (including any
               cafeteria plan governed by Section 125 of the Code), paid or
               unpaid leave (including sick leave, parental leave, military
               leave and bereavement leave), tuition assistance, relocation or
               any similar type of benefits, that has been adopted or
               implemented by HII or any HII Affiliate (including any such plan,
               program, policy or arrangement that has been terminated before
               the date hereof, if HII or any HII Affiliate could have statutory
               or contractual liability with respect to the arrangement on or
               after the date hereof);
 
           (C) each employment contract, severance contract, parachute
               agreement, option agreement, stock appreciation right agreement,
               bonus or other incentive award agreement, deferred compensation
               agreement, supplemental benefit agreement, split dollar agreement
               or other personal service or benefit contract or arrangement with
               or covering a current or former officer, director, employee or
               independent contractor of HII or any HII Affiliate.
 
             (ii) For purposes of this Agreement, "HII Pension Benefit Plan"
        means each "employee pension benefit plan" (within the meanings of
        Section 3(2) of ERISA) subject to Title IV of ERISA or the minimum
        funding requirements of Section 302 of ERISA that is or was maintained
        or contributed to by HII or any HII Affiliate at any time during the six
        calendar year period immediately preceding the date hereof, and "HII
        Affiliate" means any trade or business, whether or not incorporated,
        that is under common control, or treated as a single employer, with HII
        under Section 414(b), (c), (m) or (o) of the Code.
 
             (iii) Contributions. All material contributions and other material
        payments required to have been made by HII or any HII Affiliate under
        Section 412 of the Code or pursuant to any HII Benefit Plan (or to any
        person pursuant to the terms thereof) have been timely made or will be
        timely made in accordance with Section 404(a)(6) of the Code and all
        such amounts properly accrued through the date of this Agreement have
        been reflected in the financial statements of HII included in HII's
        Annual Report on Form 10-K for the fiscal year ended December 31, 1995.
 
             (iv) Qualification; Compliance.
 
           (A) Each HII Benefit Plan that is intended to be "qualified" within
               the meaning of Section 401(a) of the Code (1) to the knowledge of
               HII, currently meets all qualification requirements under the
               Code both in form and in operation and (2) has received a
               favorable determination letter from the IRS on its qualification
               or application for such a determination has been made prior to
               the expiration of the applicable remedial amendment period and
               HII agrees to make such plan amendments as the IRS may require in
               order to issue a favorable determination letter.
 
           (B) To the knowledge of HII, HII and each HII Affiliate are in
               compliance with, and each HII Benefit Plan is and has been
               operated in compliance with, all applicable laws, rules and
               regulations governing such plan, including, without limitation,
               ERISA and the Code, except for violations that could not have a
               Material Adverse Effect on HII. All amendments and actions
               required to bring each of the HII Benefit Plans into conformity
               with all of the applicable provisions of ERISA and the Code and
               other applicable legal requirements have been made or taken
               except to the extent that such amendments or actions are not
               required by law to be made or taken until a date after the
               Effective Time.
 
                                       31
<PAGE>   135
 
           (C) To the knowledge of HII, each HII Benefit Plan or related trust
               that is or was intended to satisfy the requirements of Section
               125, 401(k) or 501(c)(9) of the Code has met and continues to
               meet all material requirements under the applicable section of
               the Code.
 
           (D) To the knowledge of HII, no individual or entity has engaged in
               any transaction in connection with which HII or any HII
               Affiliate, or any HII Benefit Plan or any trust, trustee or
               administrator thereof, could be subject to liability pursuant to
               Section 409 or Section 502 of ERISA, or subject to an excise tax
               pursuant to Section 4975 of the Code, which could in either case
               have a Material Adverse Effect on HII.
 
           (E) To the knowledge of HII:
 
               (1) no HII Benefit Plan is subject to any ongoing audit,
                   investigation or other administrative proceeding of the IRS,
                   the Department of Labor or any other Governmental Entity or
                   is scheduled to be subject to such an audit, investigation or
                   proceeding; and
 
               (2) no HII Benefit Plan is the subject of any pending application
                   for administrative relief under any voluntary compliance
                   program of any Governmental Entity (including, without
                   limitation, the IRS' Voluntary Compliance Resolution Program
                   or Walk-in Closing Agreement Program, or the Department of
                   Labor's Delinquent Filer Voluntary Compliance Program).
 
           (v) Liabilities.
 
           (A) Pension Benefit Plans. With respect to the HII Pension Benefit
               Plans, individually and in the aggregate, no termination or
               partial termination of any HII Pension Benefit Plan or other
               event has occurred, and, to the knowledge of HII, there exists no
               condition or set of circumstances that could subject HII or any
               HII Affiliate to any liability arising under the Code, ERISA or
               any other applicable law (including, without limitation, any
               liability to or under any such plan or to the PBGC, or under any
               indemnity agreement to which HII or any HII Affiliate is a
               party), which liability could have a Material Adverse Effect on
               HII (excluding liability for benefit claims and funding
               obligations payable in the ordinary course and liability for PBGC
               insurance premiums payable in the ordinary course).
 
           (B) Insurance Policies. With respect to each HII Benefit Plan that is
               funded wholly or partially through an insurance policy, there
               will be no liability of HII or any HII Affiliate, which could
               have a Material Adverse Effect on HII, in the nature of a
               retroactive rate adjustment, loss sharing arrangement or other
               actual or contingent liability under such policy and arising
               wholly or partially out of events occurring prior to the
               Effective Time.
 
             (vi) Welfare Plans. (A) No HII Benefit Plan that is a "welfare
        plan" (within the meaning of Section 3(1) of ERISA) provides benefits
        for any retired or former employees (other than as required pursuant to
        Section 601 of ERISA) and (B) to the knowledge of HII, no circumstances
        exist that could subject HII or any HII Affiliate to an excise tax under
        Section 4976 of the Code.
 
             (vii) Funded Status of Plans. (A) Each HII Pension Benefit Plan has
        assets that, as of January 1, 1996, have a fair market value equal to or
        exceeding the present value of the accrued benefit obligations
        thereunder on a termination basis, as of January 1, 1996, based on the
        actuarial methods, tables and assumptions theretofore utilized by such
        plan's actuary in preparing such plan's most recently prepared FAS 87
        actuarial valuation report and provided by HII to NorAm, and HII is not
        aware of any existing facts or circumstances that would materially
        change the funded status of any HII Pension Benefit Plan and (B) no HII
        Pension Benefit Plan has incurred any "accumulated funding deficiency"
        (within the meaning of Section 302 of ERISA or Section 412 of the Code).
 
             (viii) Multiemployer Plans.
 
             (A) No HII Benefit Plan is or was a "multiemployer plan" (within
                 the meaning of Section 4001(a)(3) of ERISA), a multiple
                 employer plan described in Section 413(c) of
 
                                       32
<PAGE>   136
 
               the Code or a "multiple employer welfare arrangement" (within the
               meaning of Section 3(40) of ERISA); and none of HII or any HII
               Affiliate has been obligated to contribute to, or otherwise has
               or has had any liability with respect to, any multiemployer plan,
               multiple employer plan, or multiple employer welfare arrangement.
 
           (B) With respect to any HII Benefit Plan that is listed in Section
               3.2(l)(viii)(A) of the HII Disclosure Schedule as a multiemployer
               plan, neither HII nor any HII Affiliate has made or incurred a
               "complete withdrawal" or a "partial withdrawal," as such terms
               are defined in Sections 4203 and 4205 of ERISA, therefrom at any
               time during the six calendar year period immediately preceding
               the date of this Agreement and the transactions contemplated by
               the Agreement will not, in and of themselves, give rise to such a
               "complete withdrawal" or "partial withdrawal."
 
             (ix) Modification or Termination of Plans. Neither HII nor any HII
        Affiliate is subject to any legal, contractual, equitable or other
        obligation (nor have they any formal plan or commitment, whether legally
        binding or not) to enter into any form of compensation or employment
        agreement or to establish any employee benefit plan of any nature,
        including (without limitation) any pension, profit sharing, welfare,
        post-retirement welfare, stock option, stock or cash award,
        non-qualified deferred compensation or executive compensation plan,
        policy or practice or to modify or change any existing HII Benefit Plan.
        HII or one or more HII Affiliates have the right to, in any manner, and
        without the consent of any employee, beneficiary or dependent,
        employees' organization or other person, terminate, modify or amend any
        HII Benefit Plan (or their participation in any such HII Benefit Plan)
        at any time sponsored, maintained or contributed to by HII or any HII
        Affiliate, effective as of any date before, on or after the Effective
        Time except to the extent that any retroactive amendment would be
        prohibited by Section 204(g) of ERISA or would adversely affect a vested
        accrued benefit or a previously granted award under any such plan not
        subject to Section 204(g) of ERISA.
 
             (x) Reportable Events; Claims.
 
           (A) No Reportable Event has occurred with respect to any HII Pension
               Benefit Plan that could have a Material Adverse Effect on HII,
               and
 
           (B) no liability, claim, action or litigation exists, has been made,
               commenced or, to the knowledge of HII, threatened, by or against
               HII or any HII Affiliate with respect to any HII Benefit Plan
               (other than for benefits or PBGC premiums payable in the ordinary
               course) that could have a Material Adverse Effect on HII.
 
          (m) Labor Matters. Except as set forth in the HII SEC Documents or the
     HL&P SEC Documents:
 
             (i) there is no unfair labor practice charge or grievance arising
        out of a collective bargaining agreement or other grievance procedure
        against HII or any of its Subsidiaries pending, or, to the knowledge or
        HII or any of its Subsidiaries, threatened, that has, or could have, a
        Material Adverse Effect on HII;
 
             (ii) there is no complaint, lawsuit or proceeding in any forum by
        or on behalf of any present or former employee, any applicant for
        employment or any classes of the foregoing alleging breach of any
        express or implied contract of employment, any law or regulation
        governing employment or the termination thereof or other discriminatory,
        wrongful or tortious conduct in connection with the employment
        relationship against HII or any of its Subsidiaries pending, or, to the
        knowledge of HII or any of its Subsidiaries, threatened, that has, or
        could have, a Material Adverse Effect on HII;
 
             (iii) there is no strike, dispute, slowdown, work stoppage or
        lockout pending, or, to the knowledge of HII or any of its Subsidiaries,
        threatened, against or involving HII or any of its Subsidiaries that
        has, or could have, a Material Adverse Effect on HII;
 
                                       33
<PAGE>   137
 
             (iv) HII and each of its Subsidiaries are in compliance with all
        applicable laws respecting employment and employment practices, terms
        and conditions of employment, wages, hours of work and occupational
        safety and health, except for non-compliance that does not have, and
        could not have, a Material Adverse Effect on HII; and
 
             (v) there is no proceeding, claim, suit, action or governmental
        investigation pending or, to the knowledge of HII or any of its
        Subsidiaries, threatened, in respect to which any current or former
        director, officer, employee or agent of HII or any of its Subsidiaries
        is or may be entitled to claim indemnification from HII or any of its
        Subsidiaries pursuant to their respective charters or bylaws, as
        provided in any indemnification agreement to which HII or any Subsidiary
        of HII is a party or pursuant to applicable law that has, or could have,
        a Material Adverse Effect on HII.
 
          (n) Intangible Property. HII and its Subsidiaries possess or have
     adequate rights to use all material trademarks, trade names, patents,
     service marks, brand marks, brand names, computer programs, databases,
     industrial designs and copyrights necessary for the operation of the
     businesses of each of HII and its Subsidiaries (collectively, the "HII
     Intangible Property"), except where the failure to possess or have adequate
     rights to use such properties would not reasonably be expected to have a
     Material Adverse Effect on HII. All of the HII Intangible Property is owned
     by HII or its Subsidiaries free and clear of any and all liens, claims or
     encumbrances, except those that are not reasonably likely to have a
     Material Adverse Effect on HII and neither HII nor any such Subsidiary has
     forfeited or otherwise relinquished any HII Intangible Property which
     forfeiture would result in a Material Adverse Effect on HII. To the
     knowledge of HL&P and HII, the use of the HII Intangible Property by HII or
     its Subsidiaries does not, in any material respect, conflict with, infringe
     upon, violate or interfere with or constitute an appropriation of any
     right, title, interest or goodwill, including, without limitation, any
     intellectual property right, trademark, trade name, patent, service mark,
     brand mark, brand name, computer program, database, industrial design,
     copyright or any pending application therefor of any other person and there
     have been no claims made and neither HII nor any of its Subsidiaries has
     received any notice of any claim or otherwise knows that any of the HII
     Intangible Property is invalid or conflicts with the asserted rights of any
     other person or has not been used or enforced or has been failed to be used
     or enforced in a manner that would result in the abandonment, cancellation
     or unenforceability of any of the HII Intangible Property, except for any
     such conflict, infringement, violation, interference, claim, invalidity,
     abandonment, cancellation or unenforceability that would not reasonably be
     expected to have a Material Adverse Effect on HII.
 
          (o) Environmental Matters.
 
           (i) Compliance.
 
           (A) Except as set forth in the HII SEC Documents or the HL&P SEC
               Documents, HII and each of its Subsidiaries is in compliance with
               all applicable Environmental Laws, except where the failure to be
               so in compliance would not be reasonably likely to have a
               Material Adverse Effect on HII.
 
           (B) Except as set forth in the HII SEC Documents or the HL&P SEC
               Documents, neither HII nor any of its Subsidiaries has received
               any written communication from any person or Governmental Entity
               that alleges that HII or any of its Subsidiaries is not in
               compliance with applicable Environmental Laws, except where the
               failure to be so in compliance would not be reasonably likely to
               have a Material Adverse Effect on HII.
 
             (ii) Environmental Permits. Except as set forth in the HII SEC
        Documents or the HL&P SEC Documents, HII and each of its Subsidiaries
        has obtained or applied for all Environmental Permits necessary for the
        construction of their facilities and the conduct of their operations,
        and all such permits are in good standing or, where applicable, a
        renewal application has been timely filed, is pending and agency
        approval is expected to be obtained, and HII and its Subsidiaries are in
        compliance with all terms and conditions of all such Environmental
        Permits and are not required to make any expenditure in order to obtain
        or renew any Environmental Permits, except where the
 
                                       34
<PAGE>   138
 
        failure to obtain or be in compliance with such Environmental Permits
        and the requirement to make such expenditures would not be reasonably
        likely to have a Material Adverse Effect on HII.
 
             (iii) Environmental Claims. Except as set forth in the HII SEC
        Documents or the HL&P SEC Documents, there is no Environmental Claim
        pending or, to the knowledge of HII and its Subsidiaries, threatened
 
           (A) against HII or any of its Subsidiaries,
 
           (B) against any person or entity whose liability for any
               Environmental Claim HII or any of its Subsidiaries has retained
               or assumed, either contractually or by operation of law, or
 
           (C) against any real or personal property or operations that HII or
               any of its Subsidiaries owns, leases or manages, in whole or in
               part,
 
        that, if adversely determined, would be reasonably likely to have a
        Material Adverse Effect on HII.
 
             (iv) Releases. Except as set forth in the HII SEC Documents or the
        HL&P SEC Documents, and except for Releases of Hazardous Materials the
        liability for which would not be reasonably likely to have a Material
        Adverse Effect on HII, HII has no knowledge of any Release of any
        Hazardous Materials that has occurred on any of the properties owned,
        leased or occupied by HII or any Subsidiary of HII or any predecessor of
        HII or any Subsidiary of HII which requires investigation, assessment,
        monitoring, remediation or cleanup under Environmental Laws.
 
          (p) Regulation as a Utility.
 
             (i) HII is a "public utility holding company" as defined in the
        1935 Act exempt from all provisions of the 1935 Act, except Section
        9(a)(2), by order of the SEC pursuant to Section 3(a)(1) of the 1935
        Act. HL&P is a "public utility company" within the meaning of Section
        2(a)(5) of the 1935 Act. No other Subsidiary of HII is a "public utility
        company" within the meaning of Section 2(a)(5) of the 1935 Act.
 
             (ii) HL&P is regulated as a public utility in the State of Texas
        and in no other state. Neither HII nor any "subsidiary company" or
        "affiliate" (as each such term is defined in the 1935 Act) of HII (other
        than HL&P) is subject to regulation as a public utility or public
        service company (or similar designation) by any other state in the
        United States or any foreign country.
 
          (q) Opinion of Financial Advisor. The Board of Directors of HII has
     received the opinion of CS First Boston Corporation ("CS First Boston") to
     the effect that, as of the date on which the Board of Directors of HII
     approved this Agreement, the Merger Consideration is fair from a financial
     point of view to HII.
 
          (r) Vote Required.
 
             (i) The affirmative vote of the holders of two-thirds of the
        outstanding shares of each of the HL&P Class A Common Stock and the HL&P
        Class B Common Stock, voting separately as a class, is the only vote of
        the holders of any class or series of capital stock of HL&P necessary to
        approve this Agreement and the transactions contemplated hereby. The
        affirmative vote of HII, the sole holder of HL&P Class A Common Stock,
        has been obtained prior to or on the date hereof. HII shall cause its
        wholly owned subsidiary Houston Industries (Delaware) Incorporated, the
        sole holder of HL&P Class B Common Stock, to approve this Agreement and
        the transactions contemplated hereby as soon as practicable after the
        date hereof.
 
             (ii) The affirmative vote of the holders of two-thirds of the
        outstanding shares of HII Common Stock is the only vote of the holders
        of any class or series of capital stock of HII necessary to approve this
        Agreement, the issuance of shares of HL&P Common Stock pursuant to the
        Mergers and the other transactions contemplated hereby.
 
                                       35
<PAGE>   139
 
          (s) Beneficial Ownership of NorAm Common Stock. As of the date hereof,
     assuming the accuracy of the representation set forth in Section 3.1(b),
     neither HII nor any of its Subsidiaries "beneficially owns" (as defined in
     Rule 13d-3 under the Exchange Act) any of the outstanding NorAm Common
     Stock.
 
          (t) Brokers. Except for the fees and expenses payable to CS First
     Boston, which fees are reflected in its agreement with HII (a copy of which
     has been delivered to NorAm), no broker, investment banker or other person
     is entitled to any broker's, finder's or other similar fee or commission in
     connection with the transactions contemplated by this Agreement based upon
     arrangements made by or on behalf of HII or HL&P.
 
          (u) Financing. HII has and will continue to have sufficient cash
     resources available to it to pay the aggregate Cash Consideration.
 
          (v) Insurance. HII maintains insurance coverage as is customary for
     the business of HII and each of its Subsidiaries (taking into account the
     cost and availability of such insurance), and the transactions contemplated
     hereby will not materially adversely affect such coverage.
 
          (w) Regulatory Proceedings. Except as set forth in the HII SEC
     Documents or the HL&P SEC Documents, neither HII nor any of its
     Subsidiaries all or part of whose rates or services are regulated by a
     Governmental Entity has rates which have been or are being collected
     subject to refund, pending final resolution of any proceeding pending
     before a Governmental Entity or on appeal to the courts or is a party to
     any proceeding before the Governmental Entity or on appeal from orders of
     the Governmental Entity which could result in orders having a Material
     Adverse Effect on HII.
 
          (x) Representations with Respect to Merger Sub.
 
             (i) Merger Sub is a corporation duly organized, validly existing
        and in good standing under the laws of Delaware. Merger Sub was formed
        solely for the purpose of being an acquisition vehicle, has engaged in
        no other business activities, has incurred no obligations or
        liabilities, has no other assets and has no Subsidiaries.
 
             (ii) As of the date hereof, the authorized capital stock of Merger
        Sub consists of 1,000 shares of common stock, par value $0.01 per share,
        of Merger Sub, all of which are validly issued, fully paid and
        nonassessable and are owned by HII.
 
             (iii) Merger Sub has all requisite corporate power and authority to
        enter into this Agreement and to consummate the transactions
        contemplated hereby. The execution and delivery of this Agreement and
        the consummation by Merger Sub of the transactions contemplated hereby
        have been duly authorized by all necessary corporate action on the part
        of Merger Sub. This Agreement has been duly executed and delivered by
        Merger Sub and, assuming this Agreement constitutes the valid and
        binding obligation of NorAm, constitutes a valid and binding obligation
        of Merger Sub enforceable in accordance with its terms, subject, as to
        enforceability, to bankruptcy, insolvency, reorganization and other laws
        of general applicability relating to or affecting creditors' rights and
        to general principles of equity.
 
                                   ARTICLE IV
 
                    CONDUCT OF BUSINESS PENDING THE MERGERS
 
     4.1  Conduct of Business by NorAm Pending the Mergers. During the period
from the date of this Agreement and continuing until the Effective Time, NorAm
agrees as to itself and its Subsidiaries that (except as expressly contemplated
or permitted by this Agreement, as provided in Section 4.1 of the NorAm
Disclosure Schedule (each of which exceptions shall specifically identify the
relevant subsection hereof to which it relates) or to the extent that HII shall
otherwise consent in writing):
 
          (a) Ordinary Course. Each of NorAm and its Subsidiaries shall carry on
     its businesses in the usual, regular and ordinary course in substantially
     the same manner as heretofore conducted and shall use all
 
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<PAGE>   140
 
     commercially reasonable efforts to preserve intact its present business
     organizations, keep available the services of its current officers and
     employees, subject to Section 5.10, and endeavor to preserve its
     relationships with customers, suppliers and others having business dealings
     with it to the end that its goodwill and ongoing business shall not be
     impaired in any material respect at the Effective Time.
 
          (b) Dividends; Changes in Stock. NorAm shall not, and it shall not
     permit any of its Subsidiaries to: (i) declare or pay any dividends on or
     make other distributions in respect of any of its capital stock or
     partnership interests, except for the declaration and payment of (x)
     regular quarterly cash dividends not in excess of $.07 per share of NorAm
     Common Stock with usual record and payment dates for such dividend, (y)
     regular quarterly cash distributions not in excess of $.7813 per share of
     6 1/4% Convertible Trust Originated Preferred Securities of NorAm Financing
     I with usual record and payment dates for such distribution and (z)
     dividends from a Subsidiary of NorAm to NorAm or another Subsidiary of
     NorAm and except for cash dividends or distributions paid on or with
     respect to the capital stock or partnership interests of a Subsidiary of
     NorAm; (ii) split, combine or reclassify any of its capital stock or issue
     or authorize or propose the issuance of any other securities in respect of,
     in lieu of or in substitution for shares of capital stock of NorAm; or
     (iii) repurchase, redeem or otherwise acquire, or permit any of its
     Subsidiaries to purchase, redeem or otherwise acquire, any shares of its
     capital stock, except as required by the terms of its securities
     outstanding on the date hereof or as contemplated by any existing NorAm
     Benefit Plan.
 
          (c) Issuance of Securities. Except for the issuance of NorAm Common
     Stock and any rights and options to acquire such shares pursuant to NorAm
     Stock Plans (which shares, rights or options awarded for periods subsequent
     to 1996, if any, under NorAm's 1994 Incentive Equity Plan shall be made
     strictly in accordance with the provisions of Section 5.10(d)), NorAm's
     Direct Stock Purchase and Dividend Reinvestment Plan, NorAm's Annual
     Incentive Plan and the Restricted Stock Agreement between Milton Honea and
     NorAm dated January 31, 1996, NorAm shall not, and it shall not permit any
     of its Subsidiaries to, issue, deliver or sell, or authorize or propose to
     issue, deliver or sell, any shares of its capital stock of any class, any
     Voting Debt or other voting securities of NorAm or any securities
     convertible into, or any rights, warrants or options to acquire, any such
     shares, Voting Debt or other voting securities or convertible securities,
     other than: (i) the issuance of NorAm Common Stock upon the exercise of
     stock options granted under the NorAm Stock Plans that are outstanding on
     the date hereof, or in satisfaction of stock grants or stock-based awards
     made prior to the date hereof pursuant to the NorAm Stock Plans or upon
     conversion of the NorAm Convertible Debentures or NorAm Convertible Junior
     Debentures; and (ii) issuances by a wholly owned Subsidiary of its capital
     stock to its parent.
 
          (d) Governing Documents. NorAm shall not amend or propose to amend its
     Restated Certificate of Incorporation or Bylaws.
 
          (e) No Acquisitions. Other than acquisitions as to which the aggregate
     purchase price is not in excess of $25,000,000, NorAm shall not, and it
     shall not permit any of its Subsidiaries to, acquire or agree to acquire by
     merging or consolidating with, or by purchasing a substantial equity
     interest in or a substantial portion of the assets of, or by any other
     manner, any business or any corporation, partnership, association or other
     business organization or division thereof.
 
          (f) No Dispositions. Other than dispositions in the ordinary course of
     business consistent with past practice that are not material, individually
     or in the aggregate, to NorAm and its Subsidiaries taken as a whole, or
     dispositions as to which the aggregate market value is not in excess of
     $10,000,000, NorAm shall not, and it shall not permit any of its
     Subsidiaries to, sell, lease, encumber or otherwise dispose of, or agree to
     sell, lease (whether such lease is an operating or capital lease), encumber
     or otherwise dispose of, any of its assets.
 
          (g) No Dissolution, Etc. NorAm shall not authorize, recommend, propose
     or announce an intention to adopt a plan of complete or partial liquidation
     or dissolution of NorAm or any of its Significant Subsidiaries.
 
                                       37
<PAGE>   141
 
          (h) Certain Employee Matters. Except as may be required by applicable
     law or any agreement to which NorAm or any NorAm Affiliate is a party on
     the date hereof or as expressly contemplated by this Agreement, including
     Section 4.1(c), NorAm shall not, nor shall it permit any NorAm Affiliate
     to:
 
             (i) amend, or increase the amount of (or accelerate the payment or
        vesting of) any benefit or amount payable under, any employee benefit
        plan or any other contract, agreement, commitment, arrangement, plan or
        policy providing for compensation or benefits to any current or former
        director, officer, employee or independent contractor who would be
        deemed to be an employee under applicable guidelines published by the
        IRS, and maintained by, contributed to or entered into by, NorAm or any
        NorAm Affiliate, including, without limitation, the existing NorAm
        Benefit Plans and the NorAm Pension Benefit Plans;
 
             (ii) increase (or enter into any contract, agreement, commitment or
        arrangement to increase in any manner) the compensation or fringe
        benefits, or otherwise to extend, expand or enhance the engagement,
        employment or any related rights, of any current or former director,
        officer, employee or independent contractor who would be deemed to be an
        employee under applicable guidelines published by the IRS, of NorAm or
        any NorAm Affiliate, except for normal increases in the ordinary course
        of business consistent with past practice that, in the aggregate, do not
        result in a material increase in benefits or compensation expense to
        NorAm or any NorAm Affiliate;
 
             (iii) adopt, establish or implement any plan, policy or other
        arrangement providing for any form of benefits or other compensation to
        any current or former director, officer, employee or independent
        contractor who would be deemed to be an employee under applicable
        guidelines published by the IRS, of NorAm or any NorAm Affiliate;
 
             (iv) enter into or amend any employment agreement, severance
        agreement, or other contract, agreement or arrangement with any current
        or former director, officer, employee or independent contractor who
        would be deemed to be an employee under applicable guidelines published
        by the IRS, of NorAm or any NorAm Affiliate; or
 
             (v) pay or agree to pay any pension, retirement allowance or other
        benefit not required or contemplated by any of the existing NorAm
        Benefit Plans as in effect on the date of this Agreement to any current
        or former director, officer, employee or independent contractor who
        would be deemed to be an employee under applicable guidelines published
        by the IRS, of NorAm or any NorAm Affiliate.
 
          (i) Indebtedness; Leases; Capital Expenditures. NorAm shall not, nor
     shall NorAm permit any of its Subsidiaries to, (i) incur any indebtedness
     for borrowed money (except under NorAm's existing credit facilities,
     including NorAm's receivable sales facility, and renewals thereof, and
     refinancings of existing debt that permit prepayment of such debt without
     penalty (other than LIBOR breakage costs)) or guarantee any such
     indebtedness or issue or sell any debt securities or warrants or rights to
     acquire any debt securities of such party or any of its Subsidiaries or
     guarantee any debt securities of others, (ii) except in the ordinary course
     of business, enter into any lease (whether such lease is an operating or
     capital lease) or create any mortgages, liens, security interests or other
     encumbrances on the property of NorAm or any of its Subsidiaries in
     connection with any indebtedness thereof or (iii) make or commit to make
     capital expenditures not provided for in the capital budget, as amended and
     approved by NorAm prior to the date hereof and disclosed to HII on Section
     4.1(i) of the NorAm Disclosure Schedule.
 
          (j) Accounting. NorAm shall not, nor shall it permit any of its
     Subsidiaries to, make any changes in their accounting methods which would
     be required to be disclosed under the rules and regulations of the SEC,
     except as required by law, rule, regulation or GAAP.
 
          (k) Affiliate Transactions. NorAm shall not, nor shall it permit any
     of its Subsidiaries to, enter into any agreement or arrangement with any of
     their respective affiliates (as such term is defined in Rule 405 under the
     Securities Act, an "Affiliate"), other than with wholly owned Subsidiaries
     of NorAm, on terms materially less favorable to NorAm or such Subsidiary,
     as the case may be, than could be reasonably expected to have been obtained
     with an unaffiliated third party on an arm's-length basis.
 
                                       38
<PAGE>   142
 
          (l) Rate Matters. Subject to applicable law and except for
     non-material filings in the ordinary course of business consistent with
     past practices, 10 business days prior to making any filing regarding any
     changes in its or its Subsidiaries' rates or charges (other than
     pass-through fuel and gas rates or charges under existing tariffs or rate
     schedules), standards of service, accounting, or the services it provides
     (or any amendment thereto) with any Governmental Entity, NorAm shall, and
     shall cause its Subsidiaries to, deliver a copy of such filing or amendment
     to HII. NorAm shall, and shall cause its Subsidiaries to, make all such
     filings only in the ordinary course of business consistent with past
     practices.
 
          (m) Contracts. NorAm shall not, nor shall it permit any of its
     Subsidiaries to, except in the ordinary course of business consistent with
     past practice and NorAm policy, modify, amend, terminate, renew or fail to
     use reasonable business efforts to renew any material contract or agreement
     to which it or any of its Subsidiaries is a party or waive, release or
     assign any material rights or claims. NorAm shall not, nor shall it permit
     any of its Subsidiaries to, enter into any contract involving total
     consideration of $10,000,000 or more, or in the case of NorAm Energy
     Services, Inc., any gas or power marketing contract involving total
     consideration of $50,000,000 or more, with a term longer than one year
     which is not terminable by NorAm or any such Subsidiary of NorAm without
     penalty upon no more than 30 days' prior notice.
 
          (n) Insurance. NorAm shall, and shall cause its Subsidiaries to,
     maintain with financially responsible insurance companies insurance in such
     amounts and against such risks and losses as are customary for companies
     engaged in their respective businesses.
 
          (o) Permits. NorAm shall, and shall cause its Subsidiaries to, use
     reasonable efforts to maintain in effect all existing NorAm Permits which
     are material to their respective operations.
 
          (p) Tax Matters. NorAm shall not (i) make or rescind any material
     express or deemed election relating to Taxes unless it is reasonably
     expected that such action will not adversely affect NorAm, including
     elections for any and all joint ventures, partnerships, limited liability
     companies, working interests or other investments where NorAm has the
     capacity to make such binding election, (ii) settle or compromise any
     material claim, action, suit, litigation, proceeding, arbitration,
     investigation, audit or controversy relating to Taxes, except where such
     settlement or compromise will not adversely affect NorAm or (iii) change in
     any material respect any of its methods of reporting income or deductions
     for federal income tax purposes from those expected to be employed in the
     preparation of its federal income tax Return for the taxable year ending
     December 31, 1995, except as may be required by applicable law or except
     for such changes that are reasonably expected not to adversely affect
     NorAm.
 
          (q) Discharge of Liabilities. NorAm shall not, nor shall it permit any
     of its Subsidiaries to, pay, discharge or satisfy any material claims,
     liabilities or obligations (absolute, accrued, asserted or unasserted,
     contingent or otherwise), other than the payment, discharge or
     satisfaction, in the ordinary course of business consistent with past
     practice (which includes the payment of final and unappealable judgments)
     or in accordance with their terms, of liabilities reflected or reserved
     against in, or contemplated by, the most recent consolidated financial
     statements (or the notes thereto) of NorAm included in NorAm's Annual
     Report on Form 10-K for the fiscal year ended December 31, 1995, or
     incurred in the ordinary course of business consistent with past practice.
 
          (r) Other Actions. NorAm shall not, and shall not permit any of its
     Subsidiaries to, take or fail to take any other action which would
     reasonably be expected to prevent or materially impede, interfere with or
     delay the Mergers.
 
          (s) Agreements. NorAm shall not, nor shall it permit any of its
     Subsidiaries to, agree in writing or otherwise to take any action
     inconsistent with the foregoing.
 
     4.2  Certain Restrictions in Respect of HII and HL&P. During the period
from the date of this Agreement and continuing until the Effective Time, HII and
HL&P agree as to themselves and their Subsidiaries that (except as expressly
contemplated or permitted by this Agreement, as provided in
 
                                       39
<PAGE>   143
 
Section 4.2 of the HII Disclosure Schedule (each of which exceptions shall
specifically identify the relevant subsection hereof to which it relates) or to
the extent that NorAm shall otherwise consent in writing):
 
          (a) Dividends; Changes in Stock. Each of HII and HL&P shall not (i)
     engage in any material repurchase at a premium, recapitalization,
     restructuring or reorganization with respect to its capital stock (other
     than (x) pursuant to the HII Common Stock Repurchase Program or (y) in
     connection with the HII/HL&P Merger), including, without limitation, by way
     of any extraordinary dividends on or other extraordinary distributions in
     respect of any of its capital stock, (ii) engage in any repurchase of HII
     Common Stock (other than pursuant to the HII Stock Plans) during the period
     beginning 45 days prior to the Effective Time and ending at the Effective
     Time or (iii) amend any material term or provision of the HL&P Common
     Stock.
 
          (b) Governing Documents. HL&P shall not amend or propose to amend its
     Restated Articles of Incorporation with respect to the rights of the
     holders of HL&P Common Stock except as contemplated herein.
 
          (c) Insurance. HII shall, and shall cause its Subsidiaries to,
     maintain with financially responsible insurance companies insurance in such
     amounts and against such risks and losses as are customary for companies
     engaged in their respective businesses.
 
          (d) Permits. HL&P and HII shall use reasonable efforts to maintain in
     effect all existing HII Permits which are material to their respective
     operations.
 
          (e) Certain Acquisitions. Other than acquisitions as to which the
     purchase price is not in excess of $200,000,000, HII shall not, and it
     shall not permit any of its Subsidiaries to, acquire or agree to acquire by
     merging or consolidating with, or by purchasing a substantial equity
     interest in or a substantial portion of the assets of, or by any other
     manner, any business or any corporation, partnership, association or other
     business organization or division thereof the principal business of which
     is not related to the sale, transmission, distribution, marketing or
     generation of electric power or gas or other regulated or unregulated
     utility operations. HII will consult with appropriate NorAm personnel prior
     to any acquisition with a purchase price in excess of $200,000,000 and
     NorAm shall keep any such information strictly confidential.
 
          (f) Other Actions. Each of HII and HL&P shall not, and shall not
     permit any of their Subsidiaries to, take or fail to take any other action
     which would reasonably be expected to prevent or materially impede,
     interfere with or delay the Mergers.
 
          (g) Agreements. Each of HII and HL&P shall not agree in writing or
     otherwise to take any action inconsistent with the foregoing.
 
     4.3  No Solicitation.
 
          (a) From and after the date hereof, NorAm will not, and will not
     authorize or permit any of its officers, directors, employees, agents and
     other representatives or those of any of its Subsidiaries (collectively,
     "NorAm Representatives") to, directly or indirectly, solicit, initiate or
     encourage (including by way of providing information) any prospective buyer
     or the making of any proposal that constitutes, or may reasonably be
     expected to lead to, an Acquisition Proposal (as hereinafter defined) from
     any person or engage in any discussions or negotiations with respect
     thereto or otherwise cooperate with or assist or participate in, or
     facilitate, any such proposal; provided, however, that, notwithstanding any
     other provision of this Agreement, (i) NorAm's Board of Directors may take
     and disclose to NorAm's stockholders a position contemplated by Rule
     14e-2(a) promulgated under the Exchange Act and (ii) prior to approval of
     this Agreement by NorAm's stockholders and following receipt from a third
     party (without any solicitation, initiation, encouragement, discussion or
     negotiation, directly or indirectly, by or with NorAm or any NorAm
     Representatives) of a bona fide Acquisition Proposal that is financially
     superior to the NorAm Merger and reasonably capable of being financed (as
     determined in each case in good faith by NorAm's Board of Directors after
     consultation with NorAm's financial advisors), (x) NorAm may engage in
     discussions or negotiations with such third party and may furnish such
     third
 
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<PAGE>   144
 
     party information concerning NorAm and its business, properties and assets
     if such third party executes a confidentiality and standstill agreement in
     reasonably customary form and (y) the Board of Directors of NorAm may
     withdraw, modify or not make its recommendation referred to in Section 5.5
     or terminate this Agreement in accordance with Section 7.1(g), but in each
     case referred to in the foregoing clauses (i) and (ii) only to the extent
     that the Board of Directors of NorAm shall conclude in good faith based on
     the written advice of NorAm's outside counsel that such action is necessary
     in order for the Board of Directors of NorAm to act in a manner that is
     consistent with its fiduciary obligations under applicable law,
     notwithstanding (1) a binding commitment to consummate an agreement of the
     nature of this Agreement entered into in the proper exercise of their
     applicable fiduciary duties and (2) any concessions which may be offered by
     HII in negotiations entered into pursuant to Section 7.1(g)(ii) or
     otherwise.
 
          (b) NorAm shall immediately cease and cause to be terminated any
     existing solicitation, initiation, encouragement, activity, discussion or
     negotiation with any parties conducted heretofore by NorAm or any NorAm
     Representatives with respect to any Acquisition Proposal existing on the
     date hereof.
 
          (c) Prior to taking any action referred to in Section 4.3(a), if NorAm
     intends to participate in any such discussions or negotiations or provide
     any such information to any such third party, NorAm shall give reasonable
     prior notice to HII of each such action. NorAm will promptly notify HII of
     any such requests for such information or the receipt of any Acquisition
     Proposal, including the identity of the person or group engaging in such
     discussions or negotiations, requesting such information or making such
     Acquisition Proposal, and the material terms and conditions of any
     Acquisition Proposal.
 
          (d) Nothing in this Section 4.3 shall permit NorAm to enter into any
     agreement with respect to an Acquisition Proposal during the term of this
     Agreement (it being agreed that during the term of this Agreement NorAm
     shall not enter into any agreement with any person that provides for, or in
     any way facilitates, an Acquisition Proposal other than a confidentiality
     agreement in the form referred to above).
 
          (e) As used in this Agreement, "Acquisition Proposal" means any
     proposal or offer, other than a proposal or offer by HII or any of its
     Affiliates, for, or that could be reasonably expected to lead to, a tender
     or exchange offer, a merger, consolidation or other business combination
     involving NorAm or any Significant Subsidiary of NorAm or any proposal to
     acquire in any manner a substantial equity interest in, or any substantial
     portion of the assets of, NorAm or any of its Significant Subsidiaries.
 
                                   ARTICLE V
 
                             ADDITIONAL AGREEMENTS
 
     5.1  Preparation of S-4 and the Joint Proxy Statement. As promptly as
practicable after the date hereof, HII, HL&P and NorAm shall prepare and file
with the SEC the Joint Proxy Statement and HL&P shall prepare and file with the
SEC the S-4, in which the Joint Proxy Statement will be included as a
prospectus. Each of HII, HL&P and NorAm shall use its best efforts to have the
S-4 declared effective under the Securities Act as promptly as practicable after
such filing. Each of HII, HL&P and NorAm shall use its best efforts to cause the
Joint Proxy Statement to be mailed to the shareholders of HII and the
stockholders of NorAm at the earliest practicable date. HL&P shall use its best
efforts to obtain all necessary state securities laws or "blue sky" permits,
approvals and registrations in connection with the issuance of HL&P Common Stock
in the Mergers and upon the exercise of the HII Stock Options and the NorAm
Stock Options assumed by HL&P and NorAm shall furnish all information concerning
NorAm and the holders of NorAm Common Stock as may be reasonably requested in
connection with obtaining such permits, approvals and registrations.
 
     5.2  Letter of NorAm's Accountants. NorAm shall use its best efforts to
cause to be delivered to HII a letter of Coopers & Lybrand, L.L.P., NorAm's
independent public accountants, dated a date within two business days before the
date on which the S-4 shall become effective and addressed to HII and NorAm, in
form and substance reasonably satisfactory to HII and customary in scope and
substance for letters delivered by independent public accountants in connection
with registration statements similar to the S-4.
 
                                       41
<PAGE>   145
 
     5.3  Letter of HII's Accountants. HII shall use its best efforts to cause
to be delivered to NorAm a letter of Deloitte & Touche LLP, HII's independent
public accountants, dated a date within two business days before the date on
which the S-4 shall become effective and addressed to NorAm and HII, in form and
substance reasonably satisfactory to NorAm and customary in scope and substance
for letters delivered by independent public accountants in connection with
registration statements similar to the S-4.
 
     5.4  Access to Information. Upon reasonable notice, NorAm, HII and HL&P
shall each (and shall cause each of their respective Subsidiaries to) afford to
the officers, employees, accountants, counsel and other representatives of the
others, access, during normal business hours during the period prior to the
Effective Time, to all its properties, books, contracts, commitments and records
and, during such period, each of NorAm, HII and HL&P shall (and shall cause each
of their respective Subsidiaries to) furnish promptly to the other (a) a copy of
each report, schedule, registration statement and other document filed or
received by it during such period pursuant to SEC requirements and (b) all other
information concerning its business, properties and personnel as such other
party may reasonably request. Each of NorAm, HII and HL&P agrees that it will
not, and will cause its respective representatives not to, use any information
obtained pursuant to this Section 5.4 for any purpose unrelated to the
consummation of the transactions contemplated by this Agreement. The
Confidentiality Agreements dated July 15, 1996 between HII and NorAm (the
"Confidentiality Agreements") shall apply with respect to information furnished
thereunder or hereunder and any other activities contemplated thereby.
 
     5.5  NorAm Stockholders' Meeting. NorAm shall (i) call a meeting of its
stockholders (the "NorAm Stockholders' Meeting") to be held as promptly as
practicable after the date hereof for the purpose of voting upon this Agreement
and the NorAm Merger (or in lieu thereof and only in the circumstances set forth
in Section 8.1 or Section 8.5, the Alternative Merger or the Second Alternative
Merger, respectively), (ii) through its Board of Directors, recommend to its
stockholders approval of such matters and not rescind such recommendation, (iii)
use its best efforts to obtain approval and adoption of this Agreement and the
NorAm Merger by its stockholders and (iv) use all reasonable efforts to hold
such meeting as soon as practicable after the date upon which the S-4 becomes
effective; provided, however, that nothing herein obligates NorAm to take any
action that would cause its Board of Directors to act inconsistently with their
fiduciary duties as determined by the Board of Directors of NorAm in good faith
based on the written advice of NorAm's outside counsel. The NorAm Stockholders'
Meeting shall be held on such date as soon as practicable after the date upon
which the S-4 becomes effective as NorAm and HII shall mutually determine.
 
     5.6  HII Shareholders' Meeting. HII (i) shall call the HII Shareholders'
Meeting to be held as promptly as practicable after the date hereof for the
purpose of voting upon this Agreement, the HII/HL&P Merger and the issuance of
the Stock Consideration in the NorAm Merger (or in lieu of the Mergers and only
in the circumstances set forth in Section 8.1 or 8.5, the Alternative Merger or
the Second Alternative Merger, respectively), (ii) through its Board of
Directors, recommend to its shareholders approval of such matters and not
rescind such recommendation, (iii) use its best efforts to obtain approval and
adoption of this Agreement, the HII/HL&P Merger and the issuance of the Stock
Consideration in the NorAm Merger by its shareholders and (iv) use all
reasonable efforts to hold such meeting as soon as practicable after the date
upon which the S-4 becomes effective; provided, however, that nothing herein
obligates HII to take any action that would cause its Board of Directors to act
inconsistently with their fiduciary duties as determined by the Board of
Directors of HII in good faith based on the written advice of HII's outside
counsel. The meeting of HII's shareholders for the purpose of voting upon this
Agreement, the HII/HL&P Merger and the issuance of the Stock Consideration in
the NorAm Merger (the "HII Shareholders' Meeting") shall be held on such date as
soon as practicable after the date upon which the S-4 becomes effective as NorAm
and HII shall mutually determine.
 
     5.7  Regulatory and Other Approvals.
 
          (a) HSR Act. Each party hereto shall file or cause to be filed with
     the Federal Trade Commission and the Department of Justice any
     notifications required to be filed by their respective "ultimate parent"
     companies under the HSR Act and the rules and regulations promulgated
     thereunder with respect to the transactions contemplated hereby. Such
     parties will use all commercially reasonable efforts to make such
 
                                       42
<PAGE>   146
 
     filings promptly and to respond on a timely basis to any requests for
     additional information made by either of such agencies.
 
          (b) Other Regulatory Approvals. Each party hereto shall cooperate and
     use its best efforts to promptly prepare and file all necessary
     documentation, to effect all necessary applications, notices, petitions,
     filings and other documents, and to use all commercially reasonable efforts
     to obtain (and will cooperate with each other in obtaining) any consent,
     acquiescence, authorization, order or approval of, or any exemption or
     nonopposition by, any Governmental Entity required to be obtained or made
     by NorAm, HII, HL&P or any of their Subsidiaries in connection with the
     Mergers or the taking of any action contemplated thereby or by this
     Agreement.
 
          (c) Other Approvals. Each party hereto will, and will cause its
     Subsidiaries to, take all commercially reasonable actions necessary to
     obtain (and will cooperate with each other in obtaining) all NorAm Required
     Consents and all HII Required Consents, as the case may be.
 
     5.8  Agreements of Others. Prior to the Effective Time, NorAm shall cause
to be prepared and delivered to HL&P a list identifying all persons who, at the
time of the NorAm Stockholders' Meeting, may be deemed to be "affiliates" of
NorAm as that term is used in paragraphs (c) and (d) of Rule 145 under the
Securities Act (the "Rule 145 Affiliates"). NorAm shall use its best efforts to
cause each person who is identified as a Rule 145 Affiliate in such list to
deliver to HL&P, at or prior to the Effective Time, a written agreement, in the
form to be approved by the parties hereto, that such Rule 145 Affiliate will not
sell, pledge, transfer or otherwise dispose of any shares of HL&P Common Stock
issued to such Rule 145 Affiliate pursuant to the NorAm Merger, except pursuant
to an effective registration statement or in compliance with Rule 145 or an
exemption from the registration requirements of the Securities Act.
 
     5.9  Authorization for Shares and Stock Exchange Listing. Prior to the
Effective Time, HL&P shall have taken all action necessary to permit it to issue
the number of shares of HL&P Common Stock required to be issued pursuant to
Sections 2.1 and 2.2. HL&P shall use all reasonable efforts to cause the shares
of HL&P Common Stock to be issued in the Mergers and the shares of HL&P Common
Stock to be reserved for issuance upon exercise of the HII Stock Options and the
NorAm Stock Options assumed by HL&P pursuant to Section 5.11 and issuances under
the HII Stock Plans and the NorAm Stock Plans to be approved for listing on the
NYSE, subject to official notice of issuance, prior to the Closing Date.
 
     5.10  Employee Matters.
 
          (a) HL&P and NorAm agree that all employees of NorAm immediately prior
     to the Effective Time shall be employed by the NorAm Merger Surviving
     Corporation immediately after the Effective Time, it being understood that
     neither the NorAm Merger Surviving Corporation nor HL&P shall have any
     obligation to continue employing such employees for any length of time
     thereafter.
 
          (b) From and after the Effective Time, to the extent of the accrued
     benefits described in this Section 5.10(b), HL&P will honor in accordance
     with their respective terms the employee benefit plans, programs, policies,
     arrangements and agreements listed on Section 5.10(b) to the NorAm
     Disclosure Schedule (the "Section 5.10(b) Plans") and will not take, or
     permit to be taken, any action that would reduce, eliminate or otherwise
     adversely affect the compensation or benefits accrued at the Effective Time
     (or, solely with respect to those three severance plans listed as Items 6,
     7 and 8 on Section 5.10(b) to the NorAm Disclosure Schedule, if greater, at
     termination of employment after the Effective Time) for any employee or
     former employee of NorAm or any NorAm Affiliate under any Section 5.10(b)
     Plan. Nothing contained in this Section 5.10(b) shall preclude HL&P from
     amending any Section 5.10(b) Plan to cease the accrual of benefits
     thereunder after the Effective Time (or, solely with respect to those three
     severance plans listed as Items 6, 7 and 8 on Section 5.10(b) to the NorAm
     Disclosure Schedule, if greater, at termination of employment after the
     Effective Time). For purposes of any Section 5.10(b) Plan that contains a
     provision relating to a change in control of NorAm, HL&P acknowledges that
     the consummation of the NorAm Merger constitutes such a change in control.
 
          (c) For one year after the Effective Time, HL&P will continue or cause
     to be continued without adverse change to any employee or former employee
     of NorAm and the NorAm Affiliates all NorAm
 
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<PAGE>   147
 
     Benefit Plans other than the Section 5.10(b) Plans and the types of plans
     described in Section 5.10(d) and (e) below, except that any NorAm Common
     Stock investment fund offered under a NorAm Benefit Plan will be replaced
     by either a HL&P Common Stock fund or a traditional investment fund, as
     determined by HL&P. From and after the expiration of the one-year period
     following the Effective Time, HL&P will provide the employees of NorAm and
     each NorAm Affiliate with benefits that in the aggregate are not less
     favorable than those then provided to similarly situated employees of HL&P.
     In the event a HL&P employee benefit plan is made available to employees of
     NorAm and the NorAm Affiliates, all periods of service with NorAm and the
     NorAm Affiliates will be credited to such employees for all purposes other
     than accrual of benefits, including the eligibility to participate and
     receive benefits for which a specified period of service is required under
     such HL&P employee benefit plan. The foregoing provisions of this Section
     5.10(c) will not apply to any employee benefits provided to employees of
     NorAm and the NorAm Affiliates who are covered by a collective bargaining
     agreement to the extent such provisions are inconsistent with the terms of
     any applicable collective bargaining agreement.
 
          (d) If the Effective Time does not occur on or before December 31,
     1996, awards made by NorAm under the NorAm 1994 Incentive Equity Plan (the
     "NorAm Incentive Plan") with respect to the performance cycle beginning
     January 1, 1997 (the "Cycle X Awards") will be made by utilizing the same
     salary grade levels and the same award levels assigned to each salary grade
     that were utilized in making awards under the NorAm Incentive Plan for the
     performance cycle beginning January 1, 1996.
 
          Each Cycle X Award shall be conditioned upon (1) if the recipient is
     covered by an individual severance agreement, the recipient's waiver of the
     acceleration of incentive benefits provided for in Section 3 of such
     severance agreement solely with respect to any outstanding Cycle X Awards,
     (2) the recipient's agreement that, notwithstanding any provision of any
     outstanding award agreement to the contrary, (a) if the recipient becomes
     employed by HL&P or an affiliate of HL&P at the Effective Time, each
     outstanding Cycle X Award shall automatically expire without the payment of
     any consideration to the recipient other than the grant of substitute
     awards by HL&P as described below and (b) if the recipient does not become
     employed by HL&P or an affiliate of HL&P at the Effective Time, (i) a
     fraction of the options subject to each outstanding Cycle X Award under the
     NorAm Incentive Plan shall become immediately exercisable by the recipient
     (and the option shall expire with respect to the remaining shares) and (ii)
     a fraction of all nonforfeited shares of restricted stock and opportunity
     shares subject to such award shall be immediately delivered to the
     recipient (and the remaining restricted shares and opportunity shares shall
     be forfeited), the number of such option shares, restricted shares and
     opportunity shares to be based on the opportunity (maximum) level of
     performance and the fraction to be determined by multiplying the option
     shares, restricted shares and opportunity shares by a fraction, the
     numerator of which is the number of calendar days from and including the
     effective date of the applicable performance cycle through the date of the
     Effective Time and the denominator of which is the total number of days in
     the applicable performance cycle and (3) the recipient's agreement that the
     foregoing arrangement does not constitute a reduction in the aggregate of
     the recipient's base pay and target variable pay (for individuals not
     covered by individual severance agreements) or a reduction in the aggregate
     of the recipient's base pay and incentive pay (for individuals covered by
     individual severance agreements) or the termination or denial of the
     recipient's rights to any employee benefits or a reduction in the scope or
     value thereof.
 
          As of the Effective Time, HL&P shall cause one or more substitute
     long-term incentive awards to be granted under the HII 1994 Long Term
     Incentive Compensation Plan to each individual whose award(s) under the
     NorAm Incentive Plan expired upon the individual's employment with HL&P as
     of the Effective Time in accordance with the preceding paragraph. One
     substitute award shall be granted for each award so expired on terms and
     conditions to be determined in good faith by the Personnel Committee of
     HL&P to be substantially equal to the terms and conditions of the expired
     award. With respect to each performance cycle commencing after the
     Effective Time, executive and management employees of NorAm and the NorAm
     Affiliates will be eligible to participate in all long-term and short-term
     incentive compensation, variable pay and similar plans maintained by HL&P
     for other executive and management employees of HL&P and the affiliates of
     HL&P on substantially the same basis as
 
                                       44
<PAGE>   148
 
     similarly situated executives and management employees of HL&P and the
     affiliates of HL&P. In addition, all other employees of NorAm and the NorAm
     Affiliates (including employees covered by a collective bargaining
     agreement to the extent permitted by such agreement) will be eligible to
     participate in variable pay plans and programs of HL&P on substantially the
     same basis as similarly situated employees of HL&P and the affiliates of
     HL&P. The Personnel or Benefits Committee of HL&P, as applicable, shall
     have the sole and absolute authority to determine the NorAm employees
     eligible to receive, and the amount of, benefits provided under this
     Section 5.10(d), whose good faith determination shall be conclusive and
     binding on all parties hereto, including any employee who was employed by
     NorAm prior to the Effective Time.
 
          (e) For the calendar year ending December 31, 1996, NorAm will pay to
     each employee of NorAm and the NorAm Affiliates who is a participant in a
     NorAm annual incentive compensation plan or a variable pay program the
     amount of annual incentive compensation or variable pay awarded to such
     employee for 1996 based on the level of performance goals actually attained
     by NorAm. The amount of such incentive compensation or variable pay will be
     determined in accordance with normal practice, will not be prorated if the
     Effective Time is prior to December 31, 1996, and will be paid on or before
     March 15, 1997. If the Effective Time occurs in 1997, annual incentive
     compensation and variable pay awarded to employees of NorAm and the NorAm
     Affiliates for calendar 1997 will be paid to such employees as soon as
     practicable after the Effective Time based on the level of performance
     goals NorAm actually attained at the Effective Time (if such performance
     level can reasonably be determined) or (if such performance level cannot
     reasonably be determined) based on the level of performance goals that
     would have been attained by NorAm at the target level of performance and
     will be prorated by multiplying the amount of incentive compensation so
     determined by a fraction, the numerator of which is the number of calendar
     days from and including January 1, 1997, through the date of the Effective
     Time and the denominator of which is 365.
 
          (f) For a period of at least two years after the Effective Time, HL&P
     will maintain and continue initiatives similar to those reflected in
     NorAm's Operation Breakthrough and will consider extending or integrating
     such initiatives into HL&P and the affiliates of HL&P in order to more
     fully integrate the businesses, operations and employees of HL&P and NorAm.
 
          (g) NorAm has previously established "rabbi trusts" (the "NorAm Rabbi
     Trusts") to fund certain nonqualified benefit plans, programs and
     compensation agreements for employees and directors. Pursuant to
     resolutions adopted by the NorAm Board of Directors at the time the NorAm
     Rabbi Trusts were established, the execution of this Agreement by NorAm
     will cause the NorAm Rabbi Trusts to be funded. NorAm will take such action
     as is necessary to rescind such funding resolutions. In exchange, HL&P
     agrees to maintain the NorAm Rabbi Trusts for an indefinite period of time
     and, notwithstanding any provision of the NorAm Rabbi Trusts that would
     otherwise permit earlier termination, to terminate the NorAm Rabbi Trusts
     only with the unanimous consent of those persons who, immediately prior to
     any proposed termination, would benefit from the NorAm Rabbi Trusts if the
     NorAm Rabbi Trusts were fully funded. In addition, HL&P agrees to deliver
     to the trustee of the NorAm Rabbi Trusts, on or before the occurrence of a
     change in control of HL&P (a change in control to have the same meaning as
     under the NorAm Rabbi Trusts as if the term "Company" referred to HL&P), an
     amount that is not less than 120% multiplied by the aggregate "Fully
     Funded" amounts for all "subaccounts" as most recently determined by the
     "Actuary" (as such terms are defined in the NorAm Rabbi Trusts), unless
     those persons who would benefit from the funding of the NorAm Rabbi Trusts
     unanimously waive such funding.
 
     5.11  Stock Options. (a) At the Effective Time, each outstanding NorAm
Stock Option, whether vested or unvested, of a holder who has properly elected
(in accordance with Section 2.2(e)(i)) to have HL&P assume his or her NorAm
Stock Options, shall be assumed by HL&P. Each such option shall be deemed to
constitute an option to acquire, on the same terms and conditions (giving effect
to any accelerated vesting caused by the NorAm Merger) as were applicable under
such NorAm Stock Option, a number of shares of HL&P Common Stock equal to the
number of shares of NorAm Common Stock purchasable pursuant to
 
                                       45
<PAGE>   149
 
such NorAm Stock Option multiplied by the Stock Consideration, at a price per
share equal to the per-share exercise price for the shares of NorAm Common Stock
purchasable pursuant to such NorAm Stock Option divided by the Stock
Consideration; provided, however, that in the case of any option to which
Section 421 of the Code applies by reason of its qualification under any of
Sections 422-424 of the Code, the option price, the number of shares purchasable
pursuant to such option and the terms and conditions of exercise of such option
shall be determined in order to comply with Section 424(a) of the Code; and
provided further, that the number of shares of HL&P Common Stock that may be
purchased upon exercise of such NorAm Stock Option shall not include any
fractional share and, upon exercise of such NorAm Stock Option, a cash payment
shall be made for any fractional share based upon the closing price of a share
of HL&P Common Stock on the NYSE on the last Trading Day of the calendar month
immediately preceding the date of exercise.
 
     (b) HL&P shall take all corporate action necessary to reserve for issuance
a sufficient number of shares of HL&P Common Stock for delivery upon exercise of
the NorAm Stock Options assumed in accordance with this Section 5.11. As soon as
practicable after the Effective Time, HL&P shall file with the SEC a
registration statement on Form S-8 (or any successor form) or another
appropriate form with respect to the shares of HL&P Common Stock subject to the
NorAm Stock Options assumed in accordance with this Section 5.11 and shall use
all commercially reasonable efforts to maintain the effectiveness of such
registration statement or registration statements (and maintain the current
status of the prospectus or prospectuses contained therein) for so long as the
NorAm Stock Options remain outstanding.
 
     5.12  Indemnification; Directors' and Officers' Insurance. (a) From and
after the Effective Time, the NorAm Merger Surviving Corporation shall
indemnify, defend and hold harmless each person who is now, or has been at any
time prior to the date hereof or who becomes prior to the Effective Time, an
officer or director of NorAm or any of its Subsidiaries or an employee of NorAm
or any of its Subsidiaries who acts as a fiduciary under any NorAm Benefit Plan
or NorAm Pension Benefit Plan (the "Indemnified Parties") against all losses,
claims, damages, costs, expenses (including attorneys' fees), liabilities or
judgments or amounts that are paid in settlement with the approval of the
indemnifying party (which approval shall not be unreasonably withheld) of or in
connection with any threatened or actual claim, action, suit, proceeding or
investigation based in whole or in part on or arising in whole or in part out of
the fact that such person is or was a director, officer, or such employee of
NorAm or any of its Subsidiaries whether pertaining to any matter existing or
occurring at or prior to the Effective Time and whether asserted or claimed
prior to, or at or after, the Effective Time ("Indemnified Liabilities"),
including all Indemnified Liabilities based in whole or in part on, or arising
in whole or in part out of, or pertaining to this Agreement or the transactions
contemplated hereby, in each case to the full extent permitted under applicable
law (and the NorAm Merger Surviving Corporation will pay expenses in advance of
the final disposition of any such action or proceeding to each Indemnified Party
to the full extent permitted by law). Without limiting the foregoing, in the
event any such claim, action, suit, proceeding or investigation is brought
against any Indemnified Parties (whether arising before or after the Effective
Time), (i) the NorAm Merger Surviving Corporation shall have the right to assume
the defense thereof (which it shall, in cooperation with the Indemnified
Parties, vigorously defend) and the NorAm Merger Surviving Corporation shall not
be liable to such Indemnified Parties for any legal expenses of other counsel or
any other expenses subsequently incurred by such Indemnified Parties in
connection with the defense thereof, except that if the NorAm Merger Surviving
Corporation elects not to assume such defense or there is a conflict of interest
between the NorAm Merger Surviving Corporation, on the one hand, and the
Indemnified Parties, on the other hand, including situations in which there are
one or more legal defenses available to the Indemnified Party that are different
from or additional to those available to the NorAm Merger Surviving Corporation,
the Indemnified Parties may retain counsel satisfactory to them, and the NorAm
Merger Surviving Corporation shall pay all reasonable fees and expenses of such
counsel for the Indemnified Parties promptly as statements therefor are
received; provided, however,that the NorAm Merger Surviving Corporation shall
not, in connection with any one such action or proceeding or separate but
substantially similar actions or proceedings arising out of the same general
allegations, be liable for the fees and expenses of more than one separate firm
of attorneys at any time for all Indemnified Parties except to the extent that
local counsel, in addition to such parties' regular counsel, is required in
order to effectively defend against such action or proceeding, (ii) the
Indemnified Parties will cooperate in the defense of any such matter and (iii)
the NorAm Merger Surviving Corporation shall not be liable for any settlement
effected
 
                                       46
<PAGE>   150
 
without its prior written consent (which consent shall not be unreasonably
withheld), and provided, further, that the NorAm Merger Surviving Corporation
shall not have any obligation hereunder to any Indemnified Party when and if a
court of competent jurisdiction shall ultimately determine, and such
determination shall have become final, that the indemnification of such
Indemnified Party in the manner contemplated hereby is prohibited by applicable
law. NorAm, HII, HL&P and Merger Sub agree that all rights to indemnification,
including provisions relating to advances of expenses incurred in defense of any
action or suit, existing in favor of the Indemnified Parties (including in
NorAm's Restated Certificate of Incorporation or Bylaws or in the
indemnification agreements previously provided to HII) with respect to matters
occurring through the Effective Time, shall survive the Mergers and shall
continue in full force and effect for a period of six years from the Effective
Time; provided, however, that all rights to indemnification in respect of any
Indemnified Liabilities asserted or made within such period shall continue until
the disposition of such Indemnified Liabilities.
 
     (b) For a period of six years after the Effective Time, the NorAm Merger
Surviving Corporation shall cause to be maintained in effect the current
policies of directors' and officers' liability insurance maintained by NorAm and
its Subsidiaries (provided that the NorAm Merger Surviving Corporation may
substitute therefor policies of at least the same coverage and amounts
containing terms and conditions that are no less advantageous in any material
respect to the Indemnified Parties) with respect to matters arising before the
Effective Time, provided that the NorAm Merger Surviving Corporation shall not
be required to pay an annual premium for such insurance in excess of 150% of the
last annual premium paid by NorAm prior to the date hereof, but in such case
shall purchase as much coverage as possible for such amount. NorAm represents
that the last annual premium paid by NorAm for such insurance prior to the date
hereof is the amount set forth in Section 5.12(b) to the NorAm Disclosure
Schedule.
 
     5.13  Compliance with WARN Act. HII shall, or shall cause HL&P or Merger
Sub to, comply with all laws governing the shutdown of operations of facilities,
including any action that could be construed as a "plant closing" or "mass
layoff" as those terms are defined in the Worker Adjustment and Retraining
Notification Act, 29 U.S.C. sec. 2101.2109 ("WARN") or any "employment loss" as
defined in WARN which an employee of NorAm or any of its Subsidiaries may suffer
or may be deemed to suffer in connection with the NorAm Merger.
 
     5.14  Agreement to Defend. In the event any claim, action, suit,
investigation or other proceeding by any governmental body or other person or
other legal or administrative proceeding is commenced that questions the
validity or legality of the transactions contemplated hereby or seeks damages in
connection therewith, the parties hereto agree to cooperate and use their
reasonable efforts to defend against and respond thereto.
 
     5.15  Public Announcements. HII, HL&P and Merger Sub, on the one hand, and
NorAm, on the other hand, will consult with each other before issuing any press
release or otherwise making any public statements with respect to the
transactions contemplated by this Agreement, and shall not issue any such press
release or make any such public statement prior to such consultation, except as
may be required by applicable law or by obligations pursuant to any listing
agreement with any national securities exchange or transaction reporting system.
 
     5.16  Other Actions. Except as contemplated by this Agreement, neither HII,
HL&P nor NorAm shall, and none of them shall permit any of their respective
Subsidiaries to, take or agree or commit to take any action that is reasonably
likely to result in any of its respective representations or warranties
hereunder being untrue in any material respect or in any of the conditions to
the Mergers set forth in Article VI not being satisfied.
 
     5.17  Advice of Changes; SEC Filings. HII, HL&P and NorAm shall confer on a
regular basis with each other, report on operational matters and promptly advise
each other orally and in writing of any change or event having, or which,
insofar as can reasonably be foreseen, could have, a Material Adverse Effect on
HII or NorAm, as the case may be. NorAm, HII and HL&P shall promptly provide
each other (or their respective counsel) copies of all filings made by such
party with the SEC or any other Governmental Entity in connection with this
Agreement and the transactions contemplated hereby.
 
                                       47
<PAGE>   151
 
     5.18  Reorganization. It is the intention of the parties hereto that the
Mergers will qualify as a reorganization described in Section 368(a) of the Code
(and any comparable provisions of applicable state law). Neither HL&P, HII nor
NorAm (nor any of their respective Subsidiaries) will take or omit to take any
action (whether before, on or after the Closing Date) that would cause the
Mergers not to be so treated. The parties will characterize the Mergers as such
a reorganization for purposes of all Returns and other filings.
 
     5.19  HII/HL&P Merger Surviving Corporation Board of Directors. The Board
of Directors of the HII/HL&P Merger Surviving Corporation will take such action
as may be necessary (including the amendment of the HII/HL&P Merger Surviving
Corporation's bylaws) to cause the election of four persons, each of whom shall
be mutually agreed upon by NorAm and HII and shall have been a director of NorAm
immediately prior to the date hereof, to be directors of the HII/HL&P Merger
Surviving Corporation immediately after the Effective Time. One of such
directors shall be elected as a Class II director, one shall be elected as a
Class III director, and two shall be elected as Class I directors. Subject to
the fiduciary duties of its Board of Directors, HII/HL&P Merger Surviving
Corporation shall nominate and solicit proxies for the re-election of such Class
II director for an additional three-year period upon expiration of his initial
term, provided such director continues to be qualified and willing to serve.
 
     5.20  Execution of Supplemental Indentures. At the Effective Time, the
NorAm Merger Surviving Corporation, and additionally in the case of the NorAm
Convertible Debentures and the NorAm Convertible Junior Debentures, the HII/HL&P
Merger Surviving Corporation, shall execute and deliver, supplemental
indentures, in form satisfactory to HII, assuming the obligations of NorAm under
the indentures governing NorAm's long-term indebtedness.
 
     5.21  Disclosure Schedules. The NorAm Disclosure Schedule and the HII
Disclosure Schedule (collectively, the "Disclosure Schedules") are an integral
part of this Agreement and shall modify or otherwise affect the respective
representations, warranties, covenants or agreements of the parties hereto
contained in this Agreement. All of the representations and warranties of the
parties hereto contained herein shall apply as if any of the Mergers, the
Alternative Merger or the Second Alternative Merger are to be consummated.
 
     5.22  Fairness Opinions Not Withdrawn. It shall be a condition to the
obligation of NorAm to mail the Joint Proxy Statement to its stockholders and to
hold the NorAm Stockholders' Meeting that the opinion of Merrill Lynch, referred
to in Section 3.1(t), shall not have been withdrawn, and it shall be a condition
to the obligation of HII to mail the Joint Proxy Statement to its shareholders
and to hold the HII Shareholders' Meeting that the opinion of CS First Boston,
referred to in Section 3.2(q), shall not have been withdrawn.
 
                                   ARTICLE VI
 
                              CONDITIONS PRECEDENT
 
     6.1  Conditions to Each Party's Obligation to Effect the Merger. The
respective obligation of each party to effect the Mergers shall be subject to
the satisfaction prior to the Closing Date of the following conditions:
 
          (a) NorAm Stockholder Approval. This Agreement and the NorAm Merger
     shall have been approved and adopted by the affirmative vote of the holders
     of a majority of the outstanding shares of NorAm Common Stock entitled to
     vote thereon.
 
          (b) HII Shareholder Approval. This Agreement, the HII/HL&P Merger and
     the issuance of the Stock Consideration in the NorAm Merger shall have been
     approved and adopted by the affirmative vote of the holders of two-thirds
     of the outstanding shares of HII Common Stock entitled to vote thereon.
 
          (c) NYSE Listing. The shares of HL&P Common Stock issuable to HII
     shareholders and NorAm stockholders pursuant to this Agreement and such
     other shares of HL&P Common Stock required to be reserved for issuance in
     connection with the Mergers shall have been authorized for listing on the
     NYSE upon official notice of issuance.
 
                                       48
<PAGE>   152
 
          (d) Other Approvals. The waiting period applicable to the consummation
     of the Mergers under the HSR Act shall have expired or been terminated and
     all filings required to be made prior to the relevant Effective Time with,
     and all consents, approvals, permits and authorizations required to be
     obtained prior to the relevant Effective Time from, any Governmental Entity
     in connection with the execution and delivery of this Agreement and the
     consummation of the transactions contemplated hereby by NorAm, HII, HL&P
     and Merger Sub shall have been made or obtained (as the case may be),
     except for such consents, approvals, permits and authorizations the failure
     of which to be obtained would not, in the aggregate, be reasonably likely
     in the judgment of HII to result in a Material Adverse Effect on HL&P
     (assuming the Mergers have taken place) or to materially adversely affect
     the consummation of the Mergers, and no such consent, approval, permit or
     authorization shall impose terms or conditions that would have, or would be
     reasonably likely to have, in the judgment of HII, a Material Adverse
     Effect on NorAm or HL&P (assuming the Mergers have taken place). Unless
     otherwise agreed to by HII, no such consent, approval, permit or
     authorization shall then be subject to appeal.
 
          (e) S-4. The S-4 shall have become effective under the Securities Act
     and shall not be the subject of any stop order or proceedings seeking a
     stop order.
 
          (f) No Injunctions or Restraints. No temporary restraining order,
     preliminary or permanent injunction or other order issued by any court of
     competent jurisdiction, no order of any Governmental Entity having
     jurisdiction over HL&P, HII or NorAm, and no other legal restraint or
     prohibition shall be in effect (an "Injunction") preventing or making
     illegal the consummation of the Mergers; provided, however, that prior to
     any party invoking this condition, such party shall have complied fully
     with its obligations under Section 5.7.
 
     6.2  Conditions of Obligations of HII, HL&P and Merger Sub. The obligations
of HII, HL&P and Merger Sub to effect the Mergers are subject to the
satisfaction of the following conditions, any or all of which may be waived in
whole or in part by HII, HL&P and Merger Sub.
 
          (a) Representations and Warranties. Each of the representations and
     warranties of NorAm set forth in this Agreement shall be true and correct
     in all material respects as of the date of this Agreement and (except to
     the extent such representations and warranties speak as of an earlier date)
     as of the Closing Date as though made on and as of the Closing Date, except
     where the failure to be so true and correct (without giving effect to the
     individual materiality qualifications and thresholds otherwise contained in
     Section 3.1 hereof) could not reasonably be expected to have a Material
     Adverse Effect on NorAm or as otherwise contemplated by this Agreement, and
     HII shall have received a certificate signed on behalf of NorAm by the
     Chief Executive Officer and the Chief Financial Officer of NorAm to such
     effect.
 
          (b) Performance of Obligations of NorAm. NorAm shall have performed in
     all material respects all obligations required to be performed by it under
     this Agreement at or prior to the Closing Date, and HII shall have received
     a certificate signed on behalf of NorAm by the Chief Executive Officer and
     the Chief Financial Officer of NorAm to such effect.
 
          (c) Letters from Rule 145 Affiliates. HL&P shall have received from
     each person named in the letter referred to in Section 5.8 an executed copy
     of an agreement as provided in Section 5.8.
 
          (d) Number of NorAm Dissenting Shares. At the Effective Time, the
     aggregate number of NorAm Dissenting Shares shall not exceed 10% of the
     total number of issued and outstanding shares of NorAm Common Stock.
 
          (e) Tax Opinion. HII shall have received an opinion, in form and
     substance satisfactory to HII, dated the Closing Date, a copy of which will
     be furnished to NorAm, of Baker & Botts, L.L.P., counsel to HII, to the
     effect that, if the Mergers (or in lieu thereof, the Alternative Merger or
     the Second Alternative Merger) are consummated in accordance with the terms
     of this Agreement, each of the HII/HL&P Merger and the NorAm Merger (or in
     lieu thereof, the Alternative Merger or the Second Alternative Merger) will
     be treated for federal income tax purposes as a reorganization within the
     meaning of Section 368(a) of the Code. In rendering such opinion, such
     counsel may receive and rely
 
                                       49
<PAGE>   153
 
     upon appropriate representations of fact contained in certificates of HII,
     HL&P, Merger Sub, NorAm and certain stockholders of HII and of NorAm, which
     representations are in form and substance reasonably satisfactory to such
     counsel.
 
          (f) No Material Limitations or Restraints. No Injunction shall be in
     effect (i) imposing any material limitation upon the ability of HII or any
     of its Subsidiaries effectively to control the business or operations of
     NorAm or any of its Subsidiaries or (ii) prohibiting or imposing any
     material limitation upon HII's or any of its Subsidiaries' ownership or
     operation of all or any material portion of the business or assets or
     properties of HII or NorAm or any of their respective Subsidiaries or
     compelling HII or NorAm or any of their respective Subsidiaries to divest
     or hold separate all or any material portion of the business or assets or
     properties of HII or NorAm or any of their respective Subsidiaries or
     imposing any other material limitation on any of them in the conduct of
     their businesses and no such action by any Governmental Entity seeking such
     an Injunction or an Injunction preventing or making illegal the
     consummation of the Mergers shall be pending; provided, however, that prior
     to invoking this condition, HII, HL&P and Merger Sub shall have complied
     fully with their obligations under Section 5.7.
 
          (g) NorAm Required Consents. The NorAm Required Consents shall have
     been obtained, except for such NorAm Required Consents the failure of which
     to be obtained would not have a Material Adverse Effect on NorAm.
 
     6.3  Conditions of Obligations of NorAm. The obligation of NorAm to effect
the Merger is subject to the satisfaction of the following conditions, any or
all of which may be waived in whole or in part by NorAm:
 
          (a) Representations and Warranties. Each of the representations and
     warranties of HII, HL&P and Merger Sub set forth in this Agreement shall be
     true and correct in all material respects as of the date of this Agreement
     and (except to the extent such representations and warranties speak as of
     an earlier date) as of the Closing Date as though made on and as of the
     Closing Date, except where the failure to be so true and correct (without
     giving effect to the individual materiality qualifications and thresholds
     otherwise contained in Section 3.2 hereof) could not reasonably be expected
     to have a Material Adverse Effect on HII or as otherwise contemplated by
     this Agreement, and NorAm shall have received a certificate signed on
     behalf of HII by the Chief Executive Officer and the Chief Financial
     Officer of HII to such effect.
 
          (b) Performance of Obligations of HII, HL&P and Merger Sub. HII, HL&P
     and Merger Sub shall have performed in all material respects all
     obligations required to be performed by them under this Agreement at or
     prior to the Closing Date, and NorAm shall have received a certificate
     signed on behalf of HII by the Chief Executive Officer and the Chief
     Financial Officer of HII to such effect.
 
          (c) Tax Opinion. NorAm shall have received an opinion, in form and
     substance satisfactory to NorAm, dated the Closing Date, a copy of which
     will be furnished to HII, of Jones, Day, Reavis & Pogue, counsel to NorAm,
     to the effect that, if the Mergers (or in lieu thereof, the Alternative
     Merger or the Second Alternative Merger) are consummated in accordance with
     the terms of this Agreement, the NorAm Merger (or in lieu thereof, the
     Alternative Merger or the Second Alternative Merger) should be treated for
     federal income tax purposes as a reorganization within the meaning of
     Section 368(a) of the Code. In rendering such opinion, such counsel may
     receive and rely upon appropriate representations of fact contained in
     certificates of HII, HL&P, Merger Sub, NorAm and certain stockholders and
     members of management of NorAm, which representations are in form and
     substance reasonably satisfactory to such counsel.
 
          (d) HII Required Consents. The HII Required Consents shall have been
     obtained, except for such HII Required Consents the failure of which to be
     obtained would not have a Material Adverse Effect on HII.
 
                                       50
<PAGE>   154
 
                                  ARTICLE VII
 
                           TERMINATION AND AMENDMENT
 
     7.1  Termination. This Agreement may be terminated and the Mergers may be
abandoned at any time prior to the Effective Time, whether before or after
approval of the matters presented in connection with the Mergers by the
shareholders of HII and the stockholders of NorAm:
 
          (a) by mutual written consent of NorAm, HII and HL&P, or by mutual
     action of their respective Boards of Directors;
 
          (b) by either NorAm or HII if (i) any Governmental Entity shall have
     issued any Injunction or taken any other action permanently restraining,
     enjoining or otherwise prohibiting the consummation of the Mergers and such
     Injunction or other action shall have become final and nonappealable; or
     (ii) any required approval of the shareholders or stockholders of the other
     party shall not have been obtained by reason of the failure to obtain the
     required vote upon a vote held at a duly held meeting of shareholders or
     stockholders, as the case may be, or at any adjournment thereof;
 
          (c) by either NorAm or HII if the Mergers shall not have been
     consummated by the first anniversary of the date hereof (the "Initial
     Termination Date"); provided, however, that the right to terminate this
     Agreement under this Section 7.1(c) shall not be available to any party
     whose breach of any representation or warranty or failure to fulfill any
     covenant or agreement under this Agreement has been the cause of or
     resulted in the failure of the Mergers to occur on or before such date; and
     provided, further, that if on the Initial Termination Date the conditions
     to the Closing set forth in Section 6.1(d) shall not have been fulfilled
     but all other conditions to the Closing shall have been fulfilled or shall
     be capable of being fulfilled, then the Initial Termination Date shall be
     extended to December 31, 1997;
 
          (d) by HII if (i) for any reason NorAm fails to call and hold a
     stockholders meeting for the purpose of voting upon this Agreement and the
     NorAm Merger by February 15, 1997 (provided that the right to terminate
     this Agreement under this Section 7.1(d) shall not be available to HII if
     (x) the S-4 shall not have been declared effective by the SEC at least 45
     days prior to the date of termination or (y) NorAm would be entitled to
     terminate this Agreement under Section 7.1(e)); (ii) NorAm shall have
     failed to comply in any material respect with any of the covenants or
     agreements contained in this Agreement to be complied with or performed by
     NorAm at or prior to such date of termination (provided such breach has not
     been cured within 30 days following receipt by NorAm of notice of such
     breach and is existing at the time of termination of this Agreement); (iii)
     any representation or warranty of NorAm contained in this Agreement shall
     not be true in all material respects when made or on or at the time of
     termination as if made on such date of termination (except to the extent it
     relates to a particular date) provided such breach has not been cured
     within 30 days following receipt by NorAm of notice of such breach and is
     existing at the time of termination of this Agreement, except where the
     failure to be so true and correct (without giving effect to the individual
     materiality qualifications and thresholds otherwise contained in Section
     3.1 hereof) could not reasonably be expected to have a Material Adverse
     Effect on NorAm; (iv) after the date hereof there has been any Material
     Adverse Change with respect to NorAm, except for general economic changes
     or changes that may affect the industries of NorAm or any of its
     Subsidiaries generally; or (v) any Governmental Entity shall have issued
     any Injunction or taken any other action permanently imposing, prohibiting
     or compelling any of the limitations, prohibitions or compulsions set forth
     in Section 6.2(f) and such Injunction or other action shall have become
     final and nonappealable;
 
          (e) by NorAm if (i) other than pursuant to Article VIII, the Board of
     Directors of HII shall have withdrawn or modified, in any manner which is
     adverse to NorAm, its recommendation or approval of the HII/HL&P Merger or
     this Agreement and the transactions contemplated hereby or shall have
     resolved to do so; (ii) other than pursuant to Article VIII, for any reason
     HII fails to call and hold a shareholders meeting for the purpose of voting
     upon this Agreement and the HII/HL&P Merger by February 15, 1997 (provided
     that the right to terminate this Agreement under this Section 7.1(e) shall
     not be available to
 
                                       51
<PAGE>   155
 
     NorAm if (x) the S-4 shall not have been declared effective by the SEC at
     least 45 days prior to the date of termination or (y) HII would be entitled
     to terminate this Agreement under Section 7.1(d) or (f)); (iii) HII, HL&P
     or Merger Sub shall have failed to comply in any material respect with any
     of the covenants or agreements contained in this Agreement to be complied
     with or performed by it at or prior to such date of termination (provided
     such breach has not been cured within 30 days following receipt by HII of
     notice of such breach and is existing at the time of termination of this
     Agreement); (iv) any representation or warranty of HII or HL&P contained in
     this Agreement shall not be true in all material respects when made or on
     or at the time of termination as if made on such date of termination
     (except to the extent it relates to a particular date) provided such breach
     has not been cured within 30 days following receipt by HII of notice of
     such breach and is existing at the time of termination of this Agreement,
     except where the failure to be so true and correct (without giving effect
     to the individual materiality qualifications and thresholds otherwise
     contained in Section 3.2 hereof) could not reasonably be expected to have a
     Material Adverse Effect on HII; or (v) after the date hereof there has been
     any Material Adverse Change with respect to HII, except for general
     economic changes or changes that may affect the industries of HII or any of
     its Subsidiaries generally;
 
          (f) by HII, if (i) the Board of Directors of NorAm shall have
     withdrawn or modified, in any manner which is adverse to HII, HL&P or
     Merger Sub, its recommendation or approval of the NorAm Merger or this
     Agreement and the transactions contemplated hereby or shall have resolved
     to do so, or (ii) the Board of Directors of NorAm shall have recommended to
     the stockholders of NorAm any Acquisition Proposal or any transaction
     described in the definition of Acquisition Proposal, or shall have resolved
     to do so; or
 
          (g) by NorAm, prior to approval of this Agreement by NorAm's
     stockholders, if NorAm shall exercise the right specified in clause (ii) of
     Section 4.3(a); provided that NorAm may not effect such termination
     pursuant to this Section 7.1(g) unless and until (i) NorAm gives HII at
     least one week's prior notice of its intention to effect such termination
     pursuant to this Section 7.1(g); (ii) during such week, NorAm shall, and
     shall cause its respective financial and legal advisors to, negotiate with
     HII to make such adjustments in the terms and conditions of this Agreement
     as would enable NorAm to proceed with the transactions contemplated herein;
     and (iii) NorAm pays the amounts required by Section 7.2 concurrently with
     such termination.
 
     7.2  Effect of Termination.
 
          (a) In the event of termination of this Agreement by any party hereto
     as provided in Section 7.1, this Agreement shall forthwith become void and
     there shall be no liability or obligation on the part of HII, HL&P, Merger
     Sub or NorAm except (i) with respect to this Section 7.2, the second and
     third sentences of Section 5.4, and Section 9.1, and (ii) to the extent
     that such termination results from the willful breach (except as provided
     in Section 9.8) by a party hereto of any of its representations or
     warranties or of any of its covenants or agreements contained in this
     Agreement.
 
          (b) If (i) HII or NorAm terminates this Agreement pursuant to Section
     7.1(f)(ii) or 7.1(g) or (ii) HII terminates this Agreement pursuant to
     Section 7.1(b)(ii) or 7.1(f)(i) and at the time of such termination or
     prior to the NorAm Stockholders' Meeting there shall have been an
     Acquisition Proposal, NorAm shall, on the day of such termination, pay HII
     a fee of $75 million in cash by wire transfer of immediately available
     funds to an account designated by HII.
 
          (c) If HII terminates this Agreement pursuant to Section 7.1(d)(i) or
     7.1(d)(ii), in either case as a result of a willful breach of this
     Agreement by NorAm, and Section 7.2(b)(ii) shall not apply, NorAm shall, on
     the day of such termination, pay HII a fee of $35 million in cash by wire
     transfer of immediately available funds to an account designated by HII.
 
          (d) If HII terminates this Agreement pursuant to Section 7.1(b)(ii) or
     7.1(f)(i) and Section 7.2(b)(ii) shall not apply, NorAm shall, on the day
     of such termination, pay HII a fee of $10 million in cash by wire transfer
     of immediately available funds to an account designated by HII.
 
                                       52
<PAGE>   156
 
          (e) If NorAm terminates this Agreement pursuant to Section 7.1(e)(ii)
     or (iii), in either case as result of a willful breach of this Agreement by
     HL&P, HII or Merger Sub, HII shall, on the day of such termination, pay
     NorAm a fee of $35 million in cash by wire transfer of immediately
     available funds to an account designated by NorAm.
 
          (f) If NorAm terminates this Agreement pursuant to Section 7.1(b)(ii)
     or 7.1(e)(i), HII shall, on the day of such termination, pay NorAm a fee of
     $10 million in cash by wire transfer of immediately available funds to an
     account designated by NorAm.
 
          (g) If within 12 months of any termination described in Section 7.2(c)
     or (d) above, NorAm agrees to or consummates an Acquisition Proposal, then
     upon the signing of a definitive agreement relating to such an Acquisition
     Proposal, or, if no such agreement is signed, then at the closing of such
     Acquisition Proposal, NorAm shall pay HII a fee equal to $75 million in
     cash minus any amounts as may have been previously paid by NorAm pursuant
     to this Section 7.2 by wire transfer of immediately available funds to an
     account designated by HII.
 
     7.3  Expenses. The parties agree that the agreements contained in Section
7.2 are an integral part of the transactions contemplated by this Agreement and
constitute liquidated damages and not a penalty. Notwithstanding anything to the
contrary contained in Section 7.2, if one party fails to promptly pay to the
other any fee due under Section 7.2, in addition to any amounts paid or payable
pursuant to such section, the defaulting party shall pay the costs and expenses
(including legal fees and expenses) in connection with any action, including the
filing of any lawsuit or other legal action, taken to collect payment, together
with interest on the amount of any unpaid fee at the publicly announced prime
rate of Citibank, N.A. from the date such fee was required to be paid.
 
     7.4  Amendment. This Agreement may be amended by the parties hereto, by
action taken or authorized by their respective Boards of Directors, at any time
before or after approval of the matters presented in connection with the Mergers
by the shareholders of HII and/or the stockholders of NorAm, but, after any such
approval, no amendment shall be made which by law requires further approval by
such shareholders or stockholders without such further approval. This Agreement
may not be amended except by an instrument in writing signed on behalf of each
of the parties hereto.
 
     7.5  Extension; Waiver. At any time prior to the Effective Time, the
parties hereto, by action taken or authorized by their respective Boards of
Directors, may, to the extent legally allowed: (i) extend the time for the
performance of any of the obligations or other acts of the other parties hereto;
(ii) waive any inaccuracies in the representations and warranties contained
herein or in any document delivered pursuant hereto; and (iii) waive compliance
with any of the agreements or conditions contained herein. Any agreement on the
part of a party hereto to any such extension or waiver shall be valid only if
set forth in a written instrument signed on behalf of such party.
 
                                  ARTICLE VIII
 
                               ALTERNATIVE MERGER
 
     8.1  Alternative Merger.
 
          (a) If HL&P, after consultation with its legal counsel, determines
     that upon consummation of the transactions contemplated herein the HII/HL&P
     Merger Surviving Corporation would not be an exempt "public utility holding
     company" under Section 3(a)(2) of the 1935 Act, or any rules or regulations
     promulgated by the SEC under the 1935 Act, then notwithstanding the other
     provisions of this Agreement, NorAm and HII shall be merged with and into
     HL&P, with HL&P being the surviving corporation (the "Alternative Merger"),
     and the other provisions of Sections 8.1 through 8.4 shall be applicable to
     NorAm, HII, HL&P and the Alternative Merger. Such determination may be made
     before or after (i) NorAm's stockholders approve this Agreement and the
     NorAm Merger (or in lieu thereof and only in the circumstances set forth in
     this Section 8.1 or Section 8.5, the Alternative Merger or the Second
     Alternative Merger, respectively) or (ii) HII's shareholders approve this
     Agreement, the
 
                                       53
<PAGE>   157
 
     HII/HL&P Merger and the issuance of the Stock Consideration in the NorAm
     Merger (or in lieu of the Mergers and only in the circumstances set forth
     in this Section 8.1 or Section 8.5, the Alternative Merger or the Second
     Alternative Merger, respectively).
 
          (b) At the Alternative Merger Effective Time (as hereinafter defined),
     each of NorAm and HII shall be merged with and into HL&P in accordance with
     the TBCA and the DGCL. As soon as practicable at or after the Closing,
     articles of merger, prepared and executed in accordance with the relevant
     provisions of the TBCA, with respect to the Alternative Merger (the
     "Alternative Merger Articles of Merger"), shall be filed with the Secretary
     of State of the State of Texas and a certificate of merger, prepared and
     executed in accordance with the relevant provisions of the DGCL, with
     respect to the Alternative Merger (the "Alternative Merger Certificate of
     Merger"), shall be filed with the Secretary of State of the State of
     Delaware. The Alternative Merger Articles of Merger and the Alternative
     Merger Certificate of Merger shall state that the Alternative Merger shall
     become effective immediately upon the later of (i) the filing of the
     Alternative Merger Articles of Merger with the Secretary of State of the
     State of Texas and (ii) the filing of the Alternative Merger Certificate of
     Merger with the Secretary of State of the State of Delaware, or, if agreed
     to by HL&P, HII and NorAm, at such time thereafter as is provided in the
     Alternative Merger Articles of Merger and the Alternative Merger
     Certificate of Merger. The Alternative Merger shall become effective at the
     later of (i) the time of the issuance of the certificate of merger with
     respect to the Alternative Merger by the Secretary of State of the State of
     Texas and (ii) the time that the Alternative Merger Certificate of Merger
     shall be duly filed with the Secretary of State of the State of Delaware
     or, if a later effective time was provided in the Alternative Merger
     Articles of Merger and the Alternative Merger Certificate of Merger, such
     later time (the "Alternative Merger Effective Time").
 
     8.2  Effects of the Alternative Merger.
 
          (a) At the Alternative Merger Effective Time: (i) each of NorAm and
     HII shall be merged with and into HL&P, the separate existence of NorAm and
     HII shall cease and HL&P shall continue as the surviving corporation
     (NorAm, HII and HL&P are sometimes referred to herein as the "Alternative
     Merger Constituent Corporations" and HL&P is sometimes referred to herein
     as the "Alternative Merger Surviving Corporation"); (ii) Article I and
     Article VI of the Restated Articles of Incorporation of HL&P shall be
     amended as set forth in Exhibit A hereto and, as so amended, such Restated
     Articles of Incorporation shall be the Articles of Incorporation of the
     Alternative Merger Surviving Corporation; and (iii) the Bylaws of HII as in
     effect immediately prior to the Alternative Merger Effective Time shall be
     the Bylaws of the Alternative Merger Surviving Corporation.
 
          (b) The directors and officers of HII at the Alternative Merger
     Effective Time shall, from and after the Alternative Merger Effective Time,
     be the initial directors and officers of the Alternative Merger Surviving
     Corporation and shall serve until their successors have been duly elected
     or appointed and qualified or until their earlier death, resignation or
     removal in accordance with the Alternative Merger Surviving Corporation's
     Articles of Incorporation and Bylaws.
 
          (c) The Alternative Merger shall have the effects set forth in this
     Section 8.2 and the applicable provisions of the TBCA and the DGCL.
 
     8.3  Effect of the Alternative Merger on the Capital Stock of the
Alternative Merger Constituent Corporations; Exchange of Certificates. All of
the provisions of this Agreement shall apply to the Alternative Merger, except
that (i) references to the HII/HL&P Merger Effective Time, the NorAm Merger
Effective Time and the Effective Time shall be deemed to be references to the
Alternative Merger Effective Time, (ii) references to the HII/HL&P Merger
Surviving Corporation and the NorAm Merger Surviving Corporation shall be deemed
to be references to the Alternative Merger Surviving Corporation and (iii)
references to the HII/HL&P Merger and the NorAm Merger shall be deemed to be
references to the Alternative Merger.
 
                                       54
<PAGE>   158
 
     8.4  Amendment to This Agreement. If, pursuant to Section 8.1(a), it is
decided that the Alternative Merger should be consummated, the parties hereto
shall forthwith execute an appropriate amendment to this Agreement, which
amendment (i) shall reflect any and all changes required to be made to this
Agreement so that the representations, warranties, covenants and agreements of
the parties contained herein relating to (x) the HII/HL&P Merger or the NorAm
Merger or (y) the conduct of the HII/HL&P Merger Surviving Corporation or the
NorAm Merger Surviving Corporation after the relevant Effective Time, shall
apply to the Alternative Merger and the Alternative Merger Surviving
Corporation, respectively, and (ii) shall not require further approval of the
stockholders of NorAm or of the shareholders of HII.
 
     8.5  The Second Alternative Merger.
 
          (a) The parties hereto acknowledge that in the absence of applicable
     regulatory constraints under the 1935 Act, it would be preferable for NorAm
     to merge with and into Merger Sub, with Merger Sub being the surviving
     corporation, and for the HII/HL&P Merger not to be effected. Accordingly,
     if, at the time at which all of the conditions to the parties' respective
     obligations to consummate the Mergers have been satisfied or waived, no
     such constraints under the 1935 Act shall require the Mergers to occur,
     then notwithstanding the other provisions of this Agreement, the parties
     hereto shall effect the Second Alternative Merger in lieu of the Mergers
     (and in lieu of the Alternative Merger), and other provisions of Sections
     8.5 through 8.8 shall be applicable to NorAm, HII, HL&P and the Second
     Alternative Merger.
 
          (b) At the Second Alternative Merger Effective Time (as hereinafter
     defined), NorAm shall be merged with and into Merger Sub in accordance with
     the DGCL. As soon as practicable at or after the Closing, a certificate of
     merger, prepared and executed in accordance with the relevant provisions of
     the DGCL, with respect to the Second Alternative Merger (the "Second
     Alternative Merger Certificate of Merger"), shall be filed with the
     Secretary of State of the State of Delaware. The Second Alternative Merger
     Certificate of Merger shall state that the Second Alternative Merger shall
     become effective immediately upon the filing of the Second Alternative
     Merger Certificate of Merger with the Secretary of State of the State of
     Delaware, or, if agreed to by HII and NorAm, at such time thereafter as is
     provided in the Second Alternative Merger Certificate of Merger. The Second
     Alternative Merger shall become effective at the time that the Second
     Alternative Merger Certificate of Merger shall be duly filed with the
     Secretary of State of the State of Delaware or, if a later effective time
     was provided in the Second Alternative Merger Certificate of Merger, such
     later time (the "Second Alternative Merger Effective Time").
 
     8.6  Effects of the Second Alternative Merger.
 
          (a) At the Second Alternative Merger Effective Time: (i) NorAm shall
     be merged with and into Merger Sub, the separate existence of NorAm shall
     cease and Merger Sub shall continue as the surviving corporation (NorAm and
     Merger Sub are sometimes referred to herein as the "Second Alternative
     Merger Constituent Corporations" and Merger Sub is sometimes referred to
     herein as the "Second Alternative Merger Surviving Corporation"); (ii) the
     Certificate of Incorporation of Merger Sub shall be amended to change the
     name of Merger Sub to "NorAm Energy Corp.," and, as so amended, such
     Certificate of Incorporation shall be the Certificate of Incorporation of
     the Second Alternative Merger Surviving Corporation; and (iii) the Bylaws
     of Merger Sub as in effect immediately prior to the Second Alternative
     Merger Effective Time shall be the Bylaws of the Second Alternative Merger
     Surviving Corporation.
 
          (b) The directors of Merger Sub at the Second Alternative Merger
     Effective Time shall, from and after the Second Alternative Merger
     Effective Time, be the initial directors of the Second Alternative Merger
     Surviving Corporation and the officers of NorAm at the Second Alternative
     Merger Effective Time shall, from and after the Second Alternative Merger
     Effective Time, be the initial officers of the Second Alternative Merger
     Surviving Corporation, and such directors and officers shall serve until
     their successors have been duly elected or appointed and qualified or until
     their earlier death, resignation or removal in accordance with the Second
     Alternative Merger Surviving Corporation's Certificate of Incorporation and
     Bylaws.
 
                                       55
<PAGE>   159
 
          (c) The Second Alternative Merger shall have the effects set forth in
     this Section 8.6 and the applicable provisions of the DGCL.
 
     8.7  Effect of the Second Alternative Merger on the Capital Stock of the
Second Alternative Merger Constituent Corporations; Exchange of
Certificates. All of the provisions of this Agreement shall apply to the Second
Alternative Merger, except that (i) references to the HII/HL&P Merger Effective
Time, the NorAm Merger Effective Time and the Effective Time shall be deemed to
be references to the Second Alternative Merger Effective Time, (ii) references
to the HII/HL&P Merger Surviving Corporation and the NorAm Merger Surviving
Corporation shall be deemed to be references to the Second Alternative Merger
Surviving Corporation, (iii) references to the HII/HL&P Merger and the NorAm
Merger shall be deemed to be references to the Second Alternative Merger and
(iv) references to HL&P Common Stock shall be deemed to be references to HII
Common Stock.
 
     8.8  Amendment to This Agreement. If, pursuant to Section 8.5(a), it is
decided that the Second Alternative Merger should be consummated, the parties
hereto shall forthwith execute an appropriate amendment to this Agreement, which
amendment (i) shall reflect any and all changes required to be made to this
Agreement so that the representations, warranties, covenants and agreements of
the parties contained herein relating to (x) the HII/HL&P Merger or the NorAm
Merger or (y) the conduct of the HII/HL&P Merger Surviving Corporation or the
NorAm Merger Surviving Corporation after the relevant Effective Time, shall
apply to the Second Alternative Merger and the Second Alternative Merger
Surviving Corporation, respectively, and (ii) shall not require further approval
of the stockholders of NorAm or of the shareholders of HII.
 
                                   ARTICLE IX
 
                               GENERAL PROVISIONS
 
     9.1  Payment of Expenses. Each party hereto shall pay its own expenses
incident to preparing for entering into and carrying out this Agreement and the
consummation of the transactions contemplated hereby, whether or not the Mergers
shall be consummated, except that the filing fees with respect to the Joint
Proxy Statement and the S-4 shall be shared equally by HL&P and NorAm.
 
     9.2  Nonsurvival of Representations, Warranties and Agreements. None of the
representations, warranties and agreements in this Agreement or in any
instrument delivered pursuant to this Agreement shall survive the Effective Time
and any liability for breach or violation thereof shall terminate absolutely and
be of no further force and effect at and as of the Effective Time, except for
the agreements contained in Article II, Sections 5.10 through 5.14 and 7.2 and
Articles VIII and IX, the agreements delivered pursuant to Section 5.8 and the
representations, covenants and agreements contained in Section 5.18. The
Confidentiality Agreements shall survive the execution and delivery of this
Agreement, and the provisions of the Confidentiality Agreements shall apply to
all information and material delivered hereunder.
 
     9.3  Notices. Any notice or communication required or permitted hereunder
shall be in writing and either delivered personally, telegraphed or telecopied
or sent by certified or registered mail, postage prepaid, and shall be deemed to
be given, dated and received when so delivered personally, telegraphed or
telecopied or, if mailed, five business days after the date of mailing to the
following address or telecopy number, or to such other address or addresses as
such person may subsequently designate by notice given hereunder:
 
          (a) if to HII, HL&P or Merger Sub, to:
 
              Houston Industries Incorporated
              Houston Industries Plaza
              1111 Louisiana Street
              Houston, Texas 77002-5231
              Attention: Chief Executive Officer
 
                                       56
<PAGE>   160
 
              with copies to:
 
              Hugh Rice Kelly
              Senior Vice President and General Counsel
              Houston Industries Incorporated
              Houston Industries Plaza
              1111 Louisiana Street
              Houston, Texas 77002-5231
 
              Stephen A. Massad
              Baker & Botts, L.L.P.
              One Shell Plaza
              910 Louisiana Street
              Houston, Texas 77002-4995
 
          and (b) if to NorAm, to:
 
             NorAm Energy Corp.
             1600 Smith Street
             11th Floor
             Houston, Texas 77002
             Attention: Chief Executive Officer
 
          with copies to:
 
             Hubert Gentry, Jr.
             Senior Vice President and General Counsel
             NorAm Energy Corp.
             1600 Smith Street
             11th Floor
             Houston, Texas 77002
 
             Gerry D. Osterland
             Jones, Day, Reavis & Pogue
             555 West Fifth Street
             Suite 4600
             Los Angeles, California 90013-1025
 
     9.4  Interpretation. When a reference is made in this Agreement to
Sections, such reference shall be to a Section of this Agreement unless
otherwise indicated. The table of contents, glossary of defined terms and
headings contained in this Agreement are for reference purposes only and shall
not affect in any way the meaning or interpretation of this Agreement. Whenever
the words "include," "includes" or "including" are used in this Agreement, they
shall be deemed to be followed by the words "without limitation." Unless the
context otherwise requires, "or" is disjunctive but not necessarily exclusive,
and words in the singular include the plural and in the plural include the
singular.
 
     9.5  Counterparts. This Agreement may be executed in two or more
counterparts, all of which shall be considered one and the same agreement and
shall become effective when two or more counterparts have been signed by each of
the parties and delivered to the other parties, it being understood that all
parties need not sign the same counterpart.
 
     9.6  Entire Agreement; No Third Party Beneficiaries. This Agreement
(together with the Confidentiality Agreements and any other documents and
instruments referred to herein) (a) constitutes the entire agreement and
supersedes all prior agreements and understandings, both written and oral, among
the parties with respect to the subject matter hereto and (b) except as provided
in Sections 5.9 through 5.12, is not intended to confer upon any person other
than the parties hereto any rights or remedies hereunder. Notwithstanding the
foregoing or any provision in this Agreement to the contrary, each individual
who is an
 
                                       57
<PAGE>   161
 
employee or former employee of NorAm or any NorAm Affiliate at the Effective
Time shall be a third party beneficiary with respect to the provisions of
Sections 5.9 through 5.11 relating to such employee's compensation or benefits
with full authority to enforce such provision as if such employee or former
employee were a party to this Agreement.
 
     9.7  Governing Law. This Agreement shall be governed and construed in
accordance with the laws of the State of Texas, without giving effect to the
principles of conflicts of law thereof, except to the extent the DGCL is
required to govern the NorAm Merger, the Alternative Merger or the Second
Alternative Merger, as the case may be.
 
     9.8  No Remedy in Certain Circumstances. Each party agrees that, should any
court or other competent authority hold any provision of this Agreement or part
hereof to be null, void or unenforceable, or order any party to take any action
inconsistent herewith or not to take an action consistent herewith or required
hereby, the validity, legality and enforceability of the remaining provisions
and obligations contained or set forth herein shall not in any way be affected
or impaired thereby, unless the foregoing inconsistent action or the failure to
take an action constitutes a material breach of this Agreement or makes this
Agreement impossible to perform, in which case this Agreement shall terminate
pursuant to Article VII hereof. Except as otherwise contemplated by this
Agreement, to the extent that a party hereto took an action inconsistent
herewith or failed to take action consistent herewith or required hereby
pursuant to an order or judgment of a court or other competent authority, such
party shall not incur any liability or obligation unless such party breached its
obligations under Section 5.7 or did not in good faith seek to resist or object
to the imposition or entering of such order or judgment.
 
     9.9  Assignment. Neither this Agreement nor any of the rights, interests or
obligations hereunder shall be assigned by any of the parties hereto (whether by
operation of law or otherwise) without the prior written consent of the other
parties, except that Merger Sub may assign, in its sole discretion, any or all
of its rights, interests and obligations hereunder to any newly formed, direct
wholly owned Subsidiary of HII, which Subsidiary would then be substituted for
Merger Sub for purposes of this Agreement. Subject to the preceding sentence,
this Agreement will be binding upon, inure to the benefit of and be enforceable
by the parties and their respective successors and assigns.
 
                                       58
<PAGE>   162
 
     IN WITNESS WHEREOF, each party has caused this Agreement to be signed by
its respective officers thereunto duly authorized, all as of the date first
written above.
 
                                        HOUSTON INDUSTRIES INCORPORATED
 
                                        By:       /s/  DON D. JORDAN
                                           ------------------------------------
                                                       Don D. Jordan
                                           Chairman and Chief Executive Officer
 
                                        HOUSTON LIGHTING & POWER COMPANY
 
                                        By:       /s/  DON D. JORDAN
                                           ------------------------------------
                                                       Don D. Jordan
                                           Chairman and Chief Executive Officer
 
                                        HI MERGER, INC.
 
                                        By:       /s/  DON D. JORDAN
                                           ------------------------------------
                                                       Don D. Jordan
                                           Chairman and Chief Executive Officer
 
                                        NORAM ENERGY CORP.
 
                                        By:      /s/  T. MILTON HONEA
                                           ------------------------------------
                                                      T. Milton Honea
                                           Chairman of the Board, President and
                                                  Chief Executive Officer
 
                                       59
<PAGE>   163
 
                                                                       EXHIBIT A
 
                AMENDMENTS TO RESTATED ARTICLES OF INCORPORATION
                                       OF
                        HOUSTON LIGHTING & POWER COMPANY
 
     The following amendments to the Restated Articles of Incorporation of HL&P
will be made, subject to shareholder approval, at the HII/HL&P Merger Effective
Time or the Alternative Merger Effective Time, as the case may be, in order to
(i) change the name of the HII/HL&P Merger Surviving Corporation or the
Alternative Merger Surviving Corporation, as the case may be, (ii) change the
authorized capital stock of the HII/HL&P Merger Surviving Corporation or the
Alternative Merger Surviving Corporation, as the case may be, and (iii) change
the terms of the common stock of the HII/HL&P Merger Surviving Corporation or
the Alternative Merger Surviving Corporation, as the case may be.
 
     FIRST: The first amendment alters or changes Article I of the Restated
Articles of Incorporation and the full text of such altered article is as
follows:
 
          "The name of this corporation is 'Houston Industries Incorporated.' "
 
     SECOND: The second amendment alters or changes the first paragraph of
Article VI of the Restated Articles of Incorporation and the full text of such
altered paragraph is as follows:
 
   
          "The number of shares of the total authorized capital stock of the
     Company is 720,000,000 shares, of which 10,000,000 shares are classified as
     Preferred Stock, without par value, 10,000,000 shares are classified as
     Preference Stock, without par value, and the balance of 700,000,000 shares
     are classified as Common Stock, without par value."
    
 
   
     THIRD: The third amendment alters or changes "Division D -- The Common
Stock" of Article VI of the Restated Articles of Incorporation and the full text
of such altered division is as follows:
    
 
   
          "1. Dividends. Dividends may be paid on the Common Stock, as the Board
     of Directors shall from time to time determine, out of any assets of the
     Company available for such dividends after full cumulative dividends on all
     outstanding shares of capital stock of all series ranking senior to the
     Common Stock in respect of dividends and liquidation rights (referred to in
     this Division D as "stock ranking senior to the Common Stock") have been
     paid, or declared and a sum sufficient for the payment thereof set apart,
     for all past quarterly dividend periods, and after or concurrently with
     making payment of or provision for dividends on the stock ranking senior to
     the Common Stock for the then current quarterly dividend period.
    
 
          2. Distribution of Assets. In the event of any liquidation,
     dissolution or winding up of the Company, or any reduction or decrease of
     its capital stock resulting in a distribution of assets to the holders of
     its Common Stock, after there shall have been paid to or set aside for the
     holders of the stock ranking senior to the Common Stock the full
     preferential amounts to which they are respectively entitled, the holders
     of the Common Stock shall be entitled to receive, pro rata, all of the
     remaining assets of the Company available for distribution to its
     stockholders. The Board of Directors, by vote of a majority of the members
     thereof, may distribute in kind to the holders of the Common Stock such
     remaining assets of the Company, or may sell, transfer or otherwise dispose
     of all or any of the remaining property and assets of the Company to any
     other corporation or other purchaser and receive payment therefor wholly or
     partly in cash or property, and/or in stock of any such corporation, and/or
     in obligations of such corporation or other purchaser, and may sell all or
     any part of the consideration received therefor and distribute the same or
     the proceeds thereof to the holders of the Common Stock.
 
          3. Voting Rights. Subject to the voting rights expressly conferred
     under prescribed conditions upon the stock ranking senior to the Common
     Stock, the holders of the Common Stock shall exclusively possess full
     voting power for the election of directors and for all other purposes."
 
                                       60
<PAGE>   164
                                                                  APPENDIX B


                        [LETTERHEAD OF CS FIRST BOSTON]






August 11, 1996

Board of Directors
Houston Industries Incorporated
1111 Louisiana Street
Houston, TX 77002

Members of the Board:

                 You have asked us to advise you with respect to the fairness
to Houston Industries Incorporated (the "Acquiror") from a financial point of
view of the consideration to be paid to the stockholders of NorAm Energy Corp.
(the "Company") pursuant to the terms of the Agreement and Plan of Merger,
dated as of August 11, 1996 (the "Merger Agreement"), among the Acquiror,
Houston Lighting & Power Company ("HL&P"), a wholly owned subsidiary of the
Acquiror, HI Merger, Inc. ("Merger Sub"), a direct wholly owned subsidiary of
the Acquiror, and the Company.

                 The Merger Agreement provides for, among other things, the
merger of the Acquiror with and into HL&P (the "Acquiror Merger") pursuant to
which HL&P will be the surviving corporation, immediately prior to the merger
of the Company with and into Merger Sub (the "Company Merger" and, together
with the Acquiror Merger, the "Merger") pursuant to which Merger Sub will be
the surviving corporation, provided that upon the consummation of the Merger,
HL&P would qualify as an exempt "public utility holding company" under Section
3(a)(2) of the Public Utility Holding Company Act of 1935, as amended (the
"1935 Act").  Alternatively, if upon consummation of the Merger HL&P would not
be an exempt "public utility holding company" under Section 3(a)(2) of the 1935
Act, the Merger Agreement provides for the merger of the Acquiror and the
Company with and into HL&P (the "Alternative Merger") pursuant to which HL&P
will be the surviving corporation.  Further, if no regulatory constraints exist
under the 1935 Act requiring either the Merger or the Alternative Merger, the
Merger Agreement provides for, among other things, the merger of the Company
with and into Merger Sub (the "Second Alternative Merger" and, together with
the Merger and the Alternative Merger, the "Transaction") pursuant to which
Merger Sub will be the surviving corporation.  Pursuant to the Merger
Agreement, each outstanding share of common stock, par value $0.625 per share,
of the Company (the "Company Common Stock") will be converted into the right to
receive (i) (a) in the case of the Merger or the Alternative Merger, HL&P
common stock, no par value, or (b) in the case of the Second Alternative
Merger, Acquiror common stock, no par value (the HL&P common stock or the
Acquiror common stock, as the case may be, hereinafter referred to as the
"Acquisition Company Stock"), the number of shares of which will be determined
based upon an exchange ratio (the "Exchange Ratio") as described below (the
"Stock Consideration"), or (ii) $16.00 in cash (the "Cash 
<PAGE>   165
Consideration"), in each case as the holder thereof shall elect or be deemed to
have elected pursuant to the Merger Agreement and subject to certain proration
provisions, all as more fully described in the Merger Agreement (the Stock
Consideration and the Cash Consideration hereinafter referred to as the "Merger
Consideration").

                 Pursuant to the Exchange Ratio, and subject to applicable
proration provisions, each stockholder of the Company who elects Stock
Consideration will receive for each share of Company Common Stock (i) the
equivalent of $16.00 of Acquisition Company Stock if the average closing price
of Acquiror common stock ("Average Price") is greater than $21.25 but less than
$26.00 for each of the first 20 consecutive trading days in the period
commencing 25 trading days prior to the effective time of the Transaction (the
"Average Price Period"), (ii) 0.7529 shares of Acquisition Company Stock if the
Average Price is $21.25 or lower during the Average Price Period, or (iii)
0.6154 shares of Acquisition Company Stock if the Average Price is $26.00 or
greater during the Average Price Period.  The number of shares of Company
Common Stock to be converted into the right to receive the Cash Consideration
in the Transaction shall be equal to 50% of the number of shares of Company
Common Stock outstanding.  Furthermore, the number of shares of Company Common
Stock to be converted into the right to receive the Stock Consideration shall
be equal to 50% of the number of shares of Company Common Stock outstanding.

                 In arriving at our opinion, we have reviewed certain publicly
available business and financial information relating to the Acquiror and the
Company, as well as the Merger Agreement.  We have also reviewed certain other
information, including financial forecasts, provided to us by the Company and
the Acquiror, and have met with the respective managements of the Company and
the Acquiror to discuss the businesses and prospects of the Company and the
Acquiror.  We have evaluated the pro forma financial impact of the Transaction
on the Acquiror and have considered and relied upon the views of the respective
managements of the Acquiror and the Company concerning certain strategic
implications and operational benefits which might result from the Transaction
and upon the views of management of, and regulatory counsel for, the Acquiror
concerning the anticipated regulatory treatment to be accorded to the
Transaction.

                 We have also considered certain financial and stock market
data of the Acquiror and the Company, and we have compared the data with
similar data for other publicly held companies in businesses similar to those
of the Acquiror and the Company and we have considered, to the extent publicly
available, the financial terms of certain other business combinations and other
transactions which have recently been effected.  We also considered such other
information, financial studies, analyses and investigations and financial,
economic and market criteria which we deemed relevant.

                 In connection with our review, we have not assumed any
responsibility for independent verification of any of the foregoing information
and have relied upon its being complete and accurate in all material respects.
With respect to the financial forecasts, we have assumed that such forecasts
have been reasonably prepared on bases reflecting the best currently available
estimates and judgments of the managements of the Company and the Acquiror as
to the future financial performance of the Acquiror 
<PAGE>   166
and the Company and the potential synergies and cost savings (including the
amount, timing and achievability) expected to result from the Transaction.  In
addition, we have not made an independent evaluation or appraisal of the assets
or liabilities (contingent or otherwise) of the Acquiror or the Company, nor
have we been furnished with any such evaluations or appraisals.  Our opinion is
necessarily based upon financial, economic, market and other conditions as they
exist and can be evaluated on the date hereof.  We are not expressing any
opinion as to what the value of the Acquisition Company Stock actually will be
when issued to the Company's stockholders pursuant to the Transaction or the
prices at which Acquisition Company Stock will trade subsequent to the
Transaction.  We have assumed, with your consent, that the Transaction will be
treated as a tax-free reorganization for federal income tax purposes.  We have
assumed, with your consent and based upon the views of management of, and
regulatory counsel for, the Acquiror, that in the course of obtaining the
necessary regulatory and governmental approvals for the proposed Transaction, no
restriction will be imposed that will have a material adverse effect on the
contemplated benefits of the Transaction.

                 We have acted as financial advisor to the Acquiror in
connection with the Transaction and will receive a fee for our services, a
significant portion of which is contingent upon the consummation of the
Transaction.  We will also receive a fee for rendering this opinion.  In the
past, we have performed certain investment banking services for the Acquiror
and the Company and have received customary fees for such services.  In the
ordinary course of our business, CS First Boston and its affiliates may
actively trade the debt and equity securities of both the Company and the
Acquiror for their own account and for the accounts of customers and,
accordingly, may at any time hold a long or short position in such securities.

                 It is understood that this letter is for the information of
the Board of Directors of the Acquiror in connection with its evaluation of the
Transaction and is not intended to be and shall not be deemed to constitute a
recommendation to any stockholder as to how such stockholder should vote on the
Transaction.  This letter is not to be quoted or referred to, in whole or in
part, in any registration statement, prospectus or proxy statement, or in any
other document used in connection with the offering or sale of securities, nor
shall this letter be used for any other purposes, without CS First Boston's
prior written consent.

                 Based upon and subject to the foregoing, it is our opinion
that, as of the date hereof, the Merger Consideration to be paid to the
stockholders of the Company in the Transaction is fair to the Acquiror from a
financial point of view.

Very truly yours,

CS FIRST BOSTON CORPORATION





<PAGE>   167
                                                                     APPENDIX C

                         [LETTERHEAD OF MERRILL LYNCH]


                                                                 August 11, 1996



Board of Directors
NorAm Energy Corp.
1600 Smith, 11th Floor
Houston, TX 77002

Gentlemen:

         NorAm Energy Corp. (the "Company"), Houston Industries Incorporated
(the "Acquiror") and a wholly owned subsidiary of the Acquiror (the
"Acquisition Sub"), propose to enter into an agreement (the "Agreement")
pursuant to which the Company will be merged with and into the Acquisition Sub
(with the Acquisition Sub as the surviving company) in a transaction (the
"Merger") in which holders of the Company's common stock, par value $0.625 per
share (a "Share"), will become entitled to elect to receive, subject to
proration, $16.00 per share in cash (the "Cash Consideration") or shares of the
Acquirors' common stock, no par value per share (the "Acquiror Shares"), in an
amount calculated in accordance with the immediately following sentence (the
"Stock Consideration" and together with the Cash Consideration, the
"Consideration").  With respect to the Stock Consideration, if the average
closing price of the Acquiror Shares for the 20 consecutive trading days
commencing 25 trading days prior to the closing date of the Merger (the
"Average Price") is less than or equal to $21.25, the Stock Consideration shall
equal 0.7529 Acquiror Shares; if the Average Price is greater than or equal to
$26.00, the Stock Consideration shall equal 0.6154 Acquiror Shares; and if the
Average Price is greater than $21.25 but less than $26.00, the Stock
Consideration shall equal the ratio determined by dividing $16.00 by such
Average Price.  The Cash Consideration is limited to 50% of the Consideration.
The Agreement also provides alternative means by which the transaction between
the Company and the Acquiror may be effected, none of which alter the
Consideration to be received by the stockholders of the Company.  The Merger is
expected to be considered by the respective stockholders of the Company and the
Acquiror at special stockholders' meetings and consummated on or after the date
of such meetings, subject to receipt of applicable regulatory approvals.

         You have asked us whether, in our opinion, the proposed Consideration
to be received by the holders of the Shares other than the Acquiror and its
affiliates pursuant to the Merger, taken as a whole, is fair to such
stockholders from a financial point of view.

         In arriving at the opinion set forth below, we have, among other
things:

         (1)     Reviewed the Company's Annual Reports, Forms 10-K and related
                 financial information for the five fiscal years ended December
                 31, 1995 and the Company's Form 10-Q and the related unaudited
                 financial information for the quarterly period ending March
                 31, 1996;

         (2)     Reviewed the Acquiror's Annual Reports, Forms 10-K and related
                 financial information for the five fiscal years ended December
                 31, 1995, the Acquiror's Form 10-Q and the related unaudited
                 financial information for the quarterly period ending March
                 31, 1996, and a draft of the Acquiror's form 10-Q dated August
                 8, 1996 and the related unaudited financial information for
                 the quarterly period ending June 30, 1996;

<PAGE>   168
         (3)     Reviewed certain information, including financial forecasts,
                 relating to the business, earnings, cash flow, assets and
                 prospects of the Company and the Acquiror, furnished to us by
                 the Company and the Acquiror, respectively;

         (4)     Conducted discussions with members of senior management of the
                 Company and the Acquiror concerning their respective
                 businesses, assets, properties, liabilities and prospects;

         (5)     Reviewed the historical market prices and trading activity for
                 the Shares and the common stock of the Acquiror and compared
                 them with that of certain publicly traded companies which we
                 deemed to be reasonably similar to the Company and the
                 Acquiror, respectively;

         (6)     Compared the results of operations of the Company and the
                 Acquiror with that of certain companies which we deemed to be
                 reasonably similar to the Company and the Acquiror,
                 respectively;

         (7)     Compared the proposed financial terms of the transactions
                 contemplated by the Agreement with the financial terms of
                 certain other mergers and acquisitions which we deemed to be
                 relevant;

         (8)     Reviewed a draft of the Agreement dated August 8, 1996; and

         (9)     Reviewed such other financial studies and analyses and
                 performed such other investigations and took into account such
                 other matters as we deemed necessary, including our assessment
                 of general economic, market and monetary conditions.

         In preparing our opinion, we have relied on the accuracy and
completeness of all information supplied or otherwise made available to us by
the Company and the Acquiror, and we have not independently verified such
information or undertaken an independent evaluation or appraisal of the assets
or liabilities of the Company or the Acquiror, nor were we provided with any
such evaluations or appraisals.  With respect to the financial forecasts
furnished by the Company and the Acquiror, we have assumed that they have been
reasonably prepared and reflect the best currently available estimates and
judgments of the Company's or the Acquiror's respective managements as to the
expected future financial performance of the Company or the Acquiror, as the
case may be.  We have also assumed that the final form of the Agreement will not
differ in any material respect from the draft of the Agreement reviewed by us.
We have further assumed that the Merger qualifies as a reorganization under
Internal Revenue Code Section 368(a), that the Stock Consideration will be
tax-free to recipients who receive all Stock Consideration and that the
accounting treatment of the Merger is purchase accounting.

         In connection with the preparation of this opinion, we have not been
authorized by the Company or the Board of Directors to solicit, nor have we
solicited, third-party indications of interest for the acquisition of all or
any part of the Company.

         We have, in the past, provided financial advisory and financing
services to the Company and have received fees for the rendering of such
services.  In the ordinary course of our business, we may actively trade the
securities of the Company or the Acquiror for our own account and for the
accounts of customers and, accordingly, may at any time hold a long or short
position in such securities.

<PAGE>   169
         On the basis of, and subject to the foregoing, we are of the opinion
that the proposed Consideration to be received by the holders of the Shares
other than the Acquiror and its affiliates pursuant to the Merger, taken as a
whole, is fair to such stockholders from a financial point of view.

                                        Very truly yours,
                                        
                                        MERRILL LYNCH, PIERCE, FENNER &
                                                SMITH INCORPORATED
                                        
                                        
                                        
                                        By      /s/  Richard K. Gordon       
                                           ------------------------------------
                                                Richard K. Gordon              
                                                Vice Chairman                  
                                                Investment Banking Group       
                                                                               
<PAGE>   170
 
   
                                                                      APPENDIX D
    
 
              SECTION 262 OF THE DELAWARE GENERAL CORPORATION LAW
 
sec. 262 Appraisal rights.
 
     (a) Any stockholder of a corporation of this State who holds shares of
stock on the date of the making of a demand pursuant to subsection (d) of this
section with respect to such shares, who continuously holds such shares through
the effective date of the merger or consolidation, who has otherwise complied
with subsection (d) of this section and who has neither voted in favor of the
merger or consolidation nor consented thereto in writing pursuant to sec. 228 of
this title shall be entitled to an appraisal by the Court of Chancery of the
fair value of his shares of stock under the circumstances described in
subsections (b) and (c) of this section. As used in this section, the word
"stockholder" means a holder of record of stock in a stock corporation and also
a member of record of a nonstock corporation; the words "stock" and "share" mean
and include what is ordinarily meant by those words and also membership or
membership interest of a member of a nonstock corporation; and the words
"depository receipt" mean a receipt or other instrument issued by a depository
representing an interest in one or more shares, or fractions thereof, solely of
stock of a corporation, which stock is deposited with the depository.
 
     (b) Appraisal rights shall be available for the shares of any class or
series of stock of a constituent corporation in a merger or consolidation to be
effected pursuant to sec. 251 (other than a merger effected pursuant to
subsection (g) of sec. 251), sec. 252, sec. 254, sec. 257, sec. 258, sec. 263 or
sec. 264 of this title:
 
          (1) Provided, however, that no appraisal rights under this section
     shall be available for the shares of any class or series of stock, which
     stock, or depository receipts in respect thereof, at the record date fixed
     to determine the stockholders entitled to receive notice of and to vote at
     the meeting of stockholders to act upon the agreement of merger or
     consolidation, were either (i) listed on a national securities exchange or
     designated as a national market system security on an interdealer quotation
     system by the National Association of Securities Dealers, Inc. or (ii) held
     of record by more than 2,000 holders; and further provided that no
     appraisal rights shall be available for any shares of stock of the
     constituent corporation surviving a merger if the merger did not require
     for its approval the vote of the stockholders of the surviving corporation
     as provided in subsection (f) of sec. 251 of this title.
 
          (2) Notwithstanding paragraph (1) of this subsection, appraisal rights
     under this section shall be available for the shares of any class or series
     of stock of a constituent corporation if the holders thereof are required
     by the terms of an agreement of merger or consolidation pursuant to
     sec.sec. 251, 252, 254, 257, 258, 263 and 264 of this title to accept for
     such stock anything except:
 
             a. Shares of stock of the corporation surviving or resulting from
        such merger or consolidation, or depository receipts in respect thereof;
 
             b. Shares of stock of any other corporation, or depository receipts
        in respect thereof, which shares of stock or depository receipts at the
        effective date of the merger or consolidation will be either listed on a
        national securities exchange or designated as a national market system
        security on an interdealer quotation system by the National Association
        of Securities Dealers, Inc. or held of record by more than 2,000
        holders;
 
             c. Cash in lieu of fractional shares or fractional depository
        receipts described in the foregoing subparagraphs a. and b. of this
        paragraph; or
 
             d. Any combination of the shares of stock, depository receipts and
        cash in lieu of fractional shares or fractional depository receipts
        described in the foregoing subparagraphs a., b. and c. of this
        paragraph.
 
                                       D-1
<PAGE>   171
 
          (3) In the event all of the stock of a subsidiary Delaware corporation
     party to a merger effected under sec. 253 of this title is not owned by the
     parent corporation immediately prior to the merger, appraisal rights shall
     be available for the shares of the subsidiary Delaware corporation.
 
     (c) Any corporation may provide in its certificate of incorporation that
appraisal rights under this section shall be available for the shares of any
class or series of its stock as a result of an amendment to its certificate of
incorporation, any merger or consolidation in which the corporation is a
constituent corporation or the sale of all or substantially all of the assets of
the corporation. If the certificate of incorporation contains such a provision,
the procedures of this section, including those set forth in subsections (d) and
(e) of this section, shall apply as nearly as is practicable.
 
     (d) Appraisal rights shall be perfected as follows:
 
          (1) If a proposed merger or consolidation for which appraisal rights
     are provided under this section is to be submitted for approval at a
     meeting of stockholders, the corporation, not less than 20 days prior to
     the meeting, shall notify each of its stockholders who was such on the
     record date for such meeting with respect to shares for which appraisal
     rights are available pursuant to subsection (b) or (c) hereof that
     appraisal rights are available for any or all of the shares of the
     constituent corporations, and shall include in such notice a copy of this
     section. Each stockholder electing to demand the appraisal of his shares
     shall deliver to the corporation, before the taking of the vote on the
     merger or consolidation, a written demand for appraisal of his shares. Such
     demand will be sufficient if it reasonably informs the corporation of the
     identity of the stockholder and that the stockholder intends thereby to
     demand the appraisal of his shares. A proxy or vote against the merger or
     consolidation shall not constitute such a demand. A stockholder electing to
     take such action must do so by a separate written demand as herein
     provided. Within 10 days after the effective date of such merger or
     consolidation, the surviving or resulting corporation shall notify each
     stockholder of each constituent corporation who has complied with this
     subsection and has not voted in favor of or consented to the merger or
     consolidation of the date that the merger or consolidation has become
     effective; or
 
          (2) If the merger or consolidation was approved pursuant to sec. 228
     or sec. 253 of this title, each constituent corporation, either before the
     effective date of the merger or consolidation or within ten days
     thereafter, shall notify each of the holders of any class or series of
     stock of such constituent corporation who are entitled to appraisal rights
     of the approval of the merger or consolidation and that appraisal rights
     are available for any or all shares of such class or series of stock of
     such constituent corporation, and shall include in such notice a copy of
     this section; provided that, if the notice is given on or after the
     effective date of the merger or consolidation, such notice shall be given
     by the surviving or resulting corporation to all such holders of any class
     or series of stock of a constituent corporation that are entitled to
     appraisal rights. Such notice may, and, if given on or after the effective
     date of the merger or consolidation, shall, also notify such stockholders
     of the effective date of the merger or consolidation. Any stockholder
     entitled to appraisal rights may, within twenty days after the date of
     mailing of such notice, demand in writing from the surviving or resulting
     corporation the appraisal of such holder's shares. Such demand will be
     sufficient if it reasonably informs the corporation of the identity of the
     stockholder and that the stockholder intends thereby to demand the
     appraisal of such holder's shares. If such notice did not notify
     stockholders of the effective date of the merger or consolidation, either
     (i) each such constituent corporation shall send a second notice before the
     effective date of the merger or consolidation notifying each of the holders
     of any class or series of stock of such constituent corporation that are
     entitled to appraisal rights of the effective date of the merger or
     consolidation or (ii) the surviving or resulting corporation shall send
     such a second notice to all such holders on or within 10 days after such
     effective date; provided, however, that if such second notice is sent more
     than 20 days following the sending of the first notice, such second notice
     need only be sent to each stockholder who is entitled to appraisal rights
     and who has demanded appraisal of such holder's shares in accordance with
     this subsection. An affidavit of the secretary or assistant secretary or of
     the transfer agent of the corporation that is required to give either
     notice that such notice has been given shall, in the absence of fraud, be
     prima facie evidence of the facts stated therein. For purposes of
     determining the stockholders entitled to receive either notice, each
 
                                       D-2
<PAGE>   172
 
     constituent corporation may fix, in advance, a record date that shall be
     not more than 10 days prior to the date the notice is given; provided that,
     if the notice is given on or after the effective date of the merger or
     consolidation, the record date shall be such effective date. If no record
     date is fixed and the notice is given prior to the effective date, the
     record date shall be the close of business on the day next preceding the
     day on which the notice is given.
 
     (e) Within 120 days after the effective date of the merger or
consolidation, the surviving or resulting corporation or any stockholder who has
complied with subsections (a) and (d) hereof and who is otherwise entitled to
appraisal rights, may file a petition in the Court of Chancery demanding a
determination of the value of the stock of all such stockholders.
Notwithstanding the foregoing, at any time within 60 days after the effective
date of the merger or consolidation, any stockholder shall have the right to
withdraw his demand for appraisal and to accept the terms offered upon the
merger or consolidation. Within 120 days after the effective date of the merger
or consolidation, any stockholder who has complied with the requirements of
subsections (a) and (d) hereof, upon written request, shall be entitled to
receive from the corporation surviving the merger or resulting from the
consolidation a statement setting forth the aggregate number of shares not voted
in favor of the merger or consolidation and with respect to which demands for
appraisal have been received and the aggregate number of holders of such shares.
Such written statement shall be mailed to the stockholder within 10 days after
his written request for such a statement is received by the surviving or
resulting corporation or within 10 days after expiration of the period for
delivery of demands for appraisal under subsection (d) hereof, whichever is
later.
 
     (f) Upon the filing of any such petition by a stockholder, service of a
copy thereof shall be made upon the surviving or resulting corporation, which
shall within 20 days after such service file in the office of the Register in
Chancery in which the petition was filed a duly verified list containing the
names and addresses of all stockholders who have demanded payment for their
shares and with whom agreements as to the value of their shares have not been
reached by the surviving or resulting corporation. If the petition shall be
filed by the surviving or resulting corporation, the petition shall be
accompanied by such a duly verified list. The Register in Chancery, if so
ordered by the Court, shall give notice of the time and place fixed for the
hearing of such petition by registered or certified mail to the surviving or
resulting corporation and to the stockholders shown on the list at the addresses
therein stated. Such notice shall also be given by 1 or more publications at
least 1 week before the day of the hearing, in a newspaper of general
circulation published in the City of Wilmington, Delaware or such publication as
the Court deems advisable. The forms of the notices by mail and by publication
shall be approved by the Court, and the costs thereof shall be borne by the
surviving or resulting corporation.
 
     (g) At the hearing on such petition, the Court shall determine the
stockholders who have complied with this section and who have become entitled to
appraisal rights. The Court may require the stockholders who have demanded an
appraisal for their shares and who hold stock represented by certificates to
submit their certificates of stock to the Register in Chancery for notation
thereon of the pendency of the appraisal proceedings; and if any stockholder
fails to comply with such direction, the Court may dismiss the proceedings as to
such stockholder.
 
     (h) After determining the stockholders entitled to an appraisal, the Court
shall appraise the shares, determining their fair value exclusive of any element
of value arising from the accomplishment or expectation of the merger or
consolidation, together with a fair rate of interest, if any, to be paid upon
the amount determined to be the fair value. In determining such fair value, the
Court shall take into account all relevant factors. In determining the fair rate
of interest, the Court may consider all relevant factors, including the rate of
interest which the surviving or resulting corporation would have had to pay to
borrow money during the pendency of the proceeding. Upon application by the
surviving or resulting corporation or by any stockholder entitled to participate
in the appraisal proceeding, the Court may, in its discretion, permit discovery
or other pretrial proceedings and may proceed to trial upon the appraisal prior
to the final determination of the stockholder entitled to an appraisal. Any
stockholder whose name appears on the list filed by the surviving or resulting
corporation pursuant to subsection (f) of this section and who has submitted his
certificates of stock
 
                                       D-3
<PAGE>   173
 
to the Register in Chancery, if such is required, may participate fully in all
proceedings until it is finally determined that he is not entitled to appraisal
rights under this section.
 
     (i) The Court shall direct the payment of the fair value of the shares,
together with interest, if any, by the surviving or resulting corporation to the
stockholders entitled thereto. Interest may be simple or compound, as the Court
may direct. Payment shall be so made to each such stockholder, in the case of
holders of uncertificated stock forthwith, and the case of holders of shares
represented by certificates upon the surrender to the corporation of the
certificates representing such stock. The Court's decree may be enforced as
other decrees in the Court of Chancery may be enforced, whether such surviving
or resulting corporation be a corporation of this State or of any state.
 
     (j) The costs of the proceeding may be determined by the Court and taxed
upon the parties as the Court deems equitable in the circumstances. Upon
application of a stockholder, the Court may order all or a portion of the
expenses incurred by any stockholder in connection with the appraisal
proceeding, including, without limitation, reasonable attorney's fees and the
fees and expenses of experts, to be charged pro rata against the value of all
the shares entitled to an appraisal.
 
     (k) From and after the effective date of the merger or consolidation, no
stockholder who has demanded his appraisal rights as provided in subsection (d)
of this section shall be entitled to vote such stock for any purpose or to
receive payment of dividends or other distributions on the stock (except
dividends or other distributions payable to stockholders of record at a date
which is prior to the effective date of the merger or consolidation); provided,
however, that if no petition for an appraisal shall be filed within the time
provided in subsection (e) of this section, or if such stockholder shall deliver
to the surviving or resulting corporation a written withdrawal of his demand for
an appraisal and an acceptance of the merger or consolidation, either within 60
days after the effective date of the merger or consolidation as provided in
subsection (e) of this section or thereafter with the written approval of the
corporation, then the right of such stockholder to an appraisal shall cease.
Notwithstanding the foregoing, no appraisal proceeding in the Court of Chancery
shall be dismissed as to any stockholder without the approval of the Court, and
such approval may be conditioned upon such terms as the Court deems just.
 
     (l) The shares of the surviving or resulting corporation to which the
shares of such objecting stockholders would have been converted had they
assented to the merger or consolidation shall have the status of authorized and
unissued shares of the surviving or resulting corporation.
 
                                       D-4
<PAGE>   174
 
   
                                                                      APPENDIX E
    
 
             GLOSSARY OF CERTAIN TERMS RELATING TO THE TRANSACTION
 
     Unless the context otherwise requires, the following terms shall have the
following meanings when used in this Joint Proxy Statement/Prospectus.
 
     "1935 Act" means the Public Utility Holding Company Act of 1935.
 
     "Affiliates" means all persons who, at the time of the NorAm Special
Meeting, may be deemed "affiliates" of NorAm as that term is used in paragraphs
(c) and (d) of Rule 145 under the Securities Act.
 
     "Alternative Mergers" means, collectively, the First Alternative Merger and
the Second Alternative Merger.
 
     "Antitrust Division" means the Antitrust Division of the United States
Department of Justice.
 
     "Average Price" of HI Common Stock means the average of the closing sales
prices per share of HI Common Stock, rounded to four decimal places, as reported
in The Wall Street Journal's New York Stock Exchange Composite Transactions
Reports, for each of the first 20 consecutive trading days in the period
commencing 25 trading days prior to the Closing Date.
 
     "Basic Mergers" means, collectively, the HI/HL&P Merger and the NorAm
Merger.
 
     "Cash Consideration" means $16.00, the cash amount per share of NorAm
Common Stock, plus any increase thereon caused by the Closing occurring after
May 11, 1997.
 
     "Cash Election" means the election of a record holder of NorAm Common Stock
(other than dissenting shares and shares owned directly or indirectly by NorAm
or HI) to receive the Cash Consideration in exchange for such holder's shares of
NorAm Common Stock.
 
     "Cash Election Number" means the aggregate number of shares of NorAm Common
Stock to be converted into the right to receive Cash Consideration, which shall
be equal to (i) 50% of the number of shares of NorAm Common Stock outstanding
immediately prior to the Effective Time less (ii) the sum of (A) the number of
Dissenting Shares determined as of the Effective Time, (B) the number of shares
of NorAm Common Stock owned immediately prior to the Effective Time directly or
indirectly by NorAm or HI (which will be canceled) and (C) the number of shares
of NorAm Common Stock to be exchanged for cash in lieu of fractional shares.
 
     "Cash Election Shares" means the aggregate number of shares of NorAm Common
Stock with respect to which a Cash Election is made.
 
     "Certificate" means each certificate representing shares of NorAm Common
Stock surrendered to the Exchange Agent prior to the Effective Time.
 
     "Closing" means the closing of the Transaction.
 
     "Closing Date" means the date on which the Closing occurs.
 
   
     "Code" means the Internal Revenue Code of 1986, as amended.
    
 
     "CS First Boston" means CS First Boston Corporation.
 
     "DGCL" means the Delaware General Corporation Law, as amended.
 
     "Dissenting Shares" means shares of NorAm Common Stock as to which
appraisal rights have been perfected under Delaware law.
 
     "Effective Time" means the effective time of the Transaction.
 
   
     "Election Deadline" means 5:00 p.m., New York City time, on the trading day
immediately preceding the Closing Date.
    
 
                                       E-1
<PAGE>   175
 
     "Election Form" means the form on which a record holder of NorAm Common
Stock makes the Cash Election, the Stock Election or the Non-Election.
 
     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended.
 
     "Exchange Act" means the Securities Exchange Act of 1934, as amended, and
the rules and regulations promulgated thereunder.
 
     "Exchange Agent" means                                               .
 
     "FERC" means the Federal Energy Regulatory Commission.
 
     "First Alternative Merger" means the merger of NorAm and HI with and into
HL&P, with HL&P being the surviving corporation and being renamed "Houston
Industries Incorporated," effected in lieu of the Basic Mergers.
 
     "FTC" means United States Federal Trade Commission.
 
     "Governmental Entity" means any court, governmental, regulatory or
administrative agency or commission or other governmental authority or
instrumentality, domestic or foreign.
 
     "HI" means Houston Industries Incorporated, a Texas corporation.
 
     "HI Common Stock" means the common stock, without par value, of HI.
 
     "HI Energy" means Houston Industries Energy, Inc., a Delaware corporation
and wholly owned subsidiary of HI.
 
     "HI/HL&P Merger" means the merger of HI into HL&P.
 
   
     "HI Record Date" means October 18, 1996.
    
 
     "HI Right" means each right associated with each share of HI Common Stock
to purchase one two-hundredth of a share of Series A Preference Stock, without
par value, of HI.
 
   
     "HI Special Meeting" means the meeting of shareholders of HI to be held on
December 11, 1996 with respect to, among other things, approval by HI's
shareholders of the Merger Agreement and the transactions contemplated thereby.
    
 
     "HL&P" means Houston Lighting & Power Company, a Texas corporation and
wholly owned subsidiary of HI.
 
     "Houston" means the surviving corporation of the HI/HL&P Merger.
 
     "Houston Articles of Amendment" means the proposed Amendment to the HL&P
Restated Articles of Incorporation attached as Exhibit A to the Merger
Agreement, which is attached hereto as Appendix A, which will become effective
at the HI/HL&P Merger Effective Time.
 
     "Houston Articles of Incorporation" means the HL&P Restated Articles of
Incorporation, as amended and after giving effect to the Houston Articles of
Amendment.
 
     "Houston Common Stock" means the common stock, without par value, of
Houston.
 
     "Houston Right" means the preferred share purchase right associated with
each share of Houston Common Stock.
 
     "Houston Rights Certificates" means certificates representing Houston
Rights.
 
     "HSR Act" means the Hart-Scott-Rodino Antitrust Improvements Act of 1976,
as amended.
 
     "Injunction" means any temporary restraining order, preliminary or
permanent injunction or other order issued by any court of competent
jurisdiction, any order of any Governmental Entity having jurisdiction over
HL&P, HI or NorAm, or any other legal restraint or prohibition preventing or
making illegal the consummation of the Transaction.
 
                                       E-2
<PAGE>   176
 
     "Material Adverse Effect" or "Material Adverse Change" means, in the case
of NorAm or HI, as the case may be, any effect or change that is or, as far as
can be reasonably determined, may be, materially adverse to the business,
operations, assets, prospects, condition (financial or otherwise) or results of
operations of such party and its subsidiaries taken as a whole.
 
     "Merger Agreement" means the Agreement and Plan of Merger, dated August 11,
1996, by and among HI, HL&P, Merger Sub and NorAm, a copy of which is attached
to this Joint Proxy Statement/Prospectus as Appendix A.
 
     "Merger Consideration" means the Cash Consideration or the Stock
Consideration, as each NorAm stockholder has elected or deemed to have elected.
 
     "Merger Sub" means HI Merger, Inc., a Delaware corporation and wholly owned
subsidiary of HI.
 
     "Merrill Lynch" means Merrill Lynch, Pierce, Fenner & Smith Incorporated.
 
     "NEM" means NorAm Energy Management, Inc., a Delaware corporation, and
certain affiliates.
 
     "NES" means NorAm Energy Services, Inc., a Delaware corporation, and
certain affiliates.
 
     "NFS" means NorAm Field Services Corp., a Delaware corporation, and certain
affiliates.
 
     "Non-Election" means the indication by a record holder of NorAm Common
Stock (other than dissenting shares and shares owned directly or indirectly by
NorAm or HI) that such record holder has no preference as to the receipt of Cash
Consideration or Stock Consideration in exchange for such holder's shares of
NorAm Common Stock.
 
     "Non-Election Shares" means the shares of NorAm Common Stock in respect of
which a Non-Election is made or shares of NorAm Common Stock to which the holder
thereof has tried to avail itself of the appraisal right provisions of Delaware
law but has failed to comply properly with such provisions.
 
     "NorAm" means NorAm Energy Corp., a Delaware corporation.
 
     "NorAm Common Stock" means the common stock, par value $0.625 per share, of
NorAm.
 
     "NorAm Incentive Plan" means the NorAm 1994 Incentive Equity Plan.
 
     "NorAm Merger" means the merger of NorAm into Merger Sub.
 
   
     "NorAm Record Date" means October 18, 1996.
    
 
   
     "NorAm Special Meeting" means the meeting of stockholders of NorAm to be
held on December 11, 1996 with respect to, among other things, approval by
NorAm's stockholders of the Merger Agreement and the transactions contemplated
thereby.
    
 
     "NRC" means the Nuclear Regulatory Commission.
 
     "NYSE" means the New York Stock Exchange, Inc.
 
   
     "Registration Statement" means the registration statement on Form S-4
(together with all amendments, supplements and exhibits thereto) filed by HL&P
and HI pursuant to the Securities Act with respect to the Houston Common Stock
or, if the Second Alternative Merger is effected in lieu of the Basic Mergers,
HI Common Stock to be issued pursuant to the Merger Agreement.
    
 
     "Rights Agent" means Texas Commerce Bank National Association.
 
   
     "Rights Agreement" means the Rights Agreement dated as of July 11, 1990
between HI and the Rights Agent, as to be amended and restated on the Closing
Date.
    
 
     "SEC" means the United States Securities and Exchange Commission.
 
     "Second Alternative Merger" means the merger of NorAm with and into Merger
Sub, with Merger Sub being the surviving corporation and being renamed "NorAm
Energy Corp.," effected in lieu of the Basic Mergers.
 
                                       E-3
<PAGE>   177
 
     "Securities Act" means the Securities Act of 1933, as amended, and the
rules and regulations promulgated thereunder.
 
     "Selected Alternative Merger" means one of the Alternative Mergers effected
in lieu of the Basic Mergers.
 
   
     "Series A Preference Stock" means the Series A Preference Stock, without
par value, of Houston.
    
 
     "Special Meetings" means, collectively, the HI Special Meeting and the
NorAm Special Meeting.
 
     "Stock Consideration" means the amount of stock per share of NorAm Common
Stock, as determined at the Effective Time, which will not be less than 0.6154
shares nor more than 0.7529 shares of Houston Common Stock and a corresponding
number of Houston Rights (the actual number depending upon the average daily
closing prices of HI Common Stock on the NYSE during a 20-trading-day period
commencing 25 trading days prior to the Closing Date of the Transaction).
 
     "Stock Election" means the election of a record holder of NorAm Common
Stock (other than dissenting shares and shares owned directly or indirectly by
NorAm or HI) to receive the Stock Consideration in exchange for such holder's
shares of NorAm Common Stock.
 
     "Stock Election Number" means the aggregate number of shares of NorAm
Common Stock to be converted into the right to receive Stock Consideration,
which shall be equal to (i) the number of shares of NorAm Common Stock
outstanding immediately prior to the Effective Time less (ii) the sum of the
Cash Election Number and the sum of (A) the number of Dissenting Shares
determined as of the Effective Time, (B) the number of shares of NorAm Common
Stock owned immediately prior to the Effective Time directly or indirectly by
NorAm or HI (which will be canceled) and (C) the number of shares of NorAm
Common Stock to be exchanged for cash in lieu of fractional shares.
 
     "Stock Election Shares" means the aggregate number of shares of NorAm
Common Stock with respect to which a Stock Election is made.
 
     "TBCA" means the Texas Business Corporation Act, as amended.
 
     "Transaction" means the Basic Mergers or one of the Alternative Mergers
effected in lieu of the Basic Mergers.
 
     "Unit" means a unit consisting of one-thousandth of a share of Preference
Stock purchasable by the registered holders of Rights at a purchase price of
$42.50 per Unit, subject to adjustment.
 
     "U.S. Holder" means a citizen or resident of the United States or a
domestic corporation who holds HI Common Stock and exchanges such stock for
Houston Common Stock pursuant to the Transaction.
 
                                       E-4
<PAGE>   178
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 20.  INDEMNIFICATION OF DIRECTORS AND OFFICERS
 
     Article 2.02.A.(16) and Article 2.02-1 of the Texas Business Corporation
Act and Article V of HI's Amended and Restated Bylaws (which will by Houston's
Bylaws) provide HI with broad powers and authority to indemnify its directors
and officers and to purchase and maintain insurance for such purposes. Pursuant
to such statutory and Bylaw provisions, HI has purchased insurance against
certain costs of indemnification that may be incurred by it and by its officers
and directors.
 
     Additionally, Article IX of HL&P's Restated Articles of Incorporation
(which will be, as amended by the Houston Articles of Amendment, the Articles of
Incorporation of Houston) provides that a director of HL&P is not liable to HL&P
or its shareholders for monetary damages for any act or omission in the
director's capacity as director, except that Article IX does not eliminate or
limit the liability of a director for (i) breaches of such director's duty of
loyalty to HL&P and its shareholders, (ii) acts or omissions not in good faith
or which involve intentional misconduct or knowing violations of law, (iii)
transactions from which a director receives an improper benefit, irrespective of
whether the benefit resulted from an action taken within the scope of the
director's office, (iv) acts or omissions for which liability is specifically
provided by statute and (v) acts relating to unlawful stock repurchases or
payments of dividends.
 
     Article IX also provides that any subsequent amendments to Texas statutes
that further limit the liability of directors will inure to the benefit of the
directors, without any further action by shareholders. Any repeal or
modification of Article IX shall not adversely affect any right of protection of
a director of the Company existing at the time of the repeal or modification.
 
ITEM 21.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
 
     (a) Exhibits
 
   
     Exhibits not incorporated by reference to a prior filing are designated by
a cross (+); all exhibits not so designated are incorporated herein by reference
to a prior filing as indicated. Exhibits designated by an asterisk (*) have been
previously filed.
    
 
     (i) Houston Lighting & Power Company
 
   
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
 2(a)        Articles of Merger of         Form 10-Q for the quarter       1-3187      2
             Utility Fuels, Inc. with      ended September 30, 1993
             HL&P, effective October 8,
             1993
 2(b)        Agreement and Plan of         Form 8-K dated August 11,       1-3187      2(a)
             Merger dated as of August     1996
             11, 1996 among HL&P, HI,
             Merger Sub and NorAm
 3(a)        Restated Articles of          Form 10-Q for the quarter       1-3187      3
             Incorporation of HL&P dated   ended June 30, 1993
             May 11, 1993
</TABLE>
    
 
                                      II-1
<PAGE>   179
 
   
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
 3(b)+*      Articles of Amendment to
             the Articles of
             Incorporation of HL&P dated
             August 9, 1996
 3(c)+       Form of Articles of
             Amendment to the Articles
             of Incorporation of HL&P
 3(d)        Amended and Restated Bylaws   Form 10-Q for the quarter       1-3187      3
             of HL&P (as of June 5,        ended June 30, 1996
             1996)
 4(a)(1)     Mortgage and Deed of Trust    Form S-7 filed on August       2-59748      2(b)
             dated November 1, 1944        25, 1977
             between HL&P and South
             Texas Commercial National
             Bank of Houston (Texas
             Commerce Bank National
             Association, as successor
             trustee), as Trustee, as
             amended and supplemented by
             20 Supplemental Indentures
             thereto
 4(a)(2)     Twenty-First through          Form 10-K for the year          1-3187      4(a)(2)
             Fiftieth Supplemental         ended December 31, 1989
             Indentures to HL&P Mortgage
             and Deed of Trust
 4(a)(3)     Fifty-First Supplemental      Form 10-Q for the quarter       1-3187      4(a)
             Indenture dated March 25,     ended June 30, 1991
             1991 to HL&P Mortgage and
             Deed of Trust
 4(a)(4)     Fifty-Second through Fifty-   Form 10-Q for the quarter       1-3187      4
             Fifth Supplemental            ended March 31, 1992
             Indentures, each dated
             March 1, 1992, to HL&P
             Mortgage and Deed of Trust
 4(a)(5)     Fifty-Sixth and               Form 10-Q for the quarter       1-3187      4
             Fifty-Seventh Supplemental    ended September 30, 1992
             Indentures, each dated
             October 1, 1992, to HL&P
             Mortgage and Deed of Trust
 4(a)(6)     Fifty-Eighth and              Form 10-Q for the quarter       1-3187      4
             Fifty-Ninth Supplemental      ended March 31, 1993
             Indentures, each dated
             March 1, 1993, to HL&P
             Mortgage and Deed of Trust
 4(a)(7)     Sixtieth Supplemental         Form 10-Q for the quarter       1-3187      4
             Indenture dated as of July    ended June 30, 1993
             1, 1993 to HL&P Mortgage
             and Deed of Trust
 4(a)(8)     Sixty-First through           HL&P's Form 10-K for the        1-3187      4(a)(8)
             Sixty-Third Supplemental      year ended December 31,
             Indentures to HL&P Mortgage   1993
             and Deed of Trust
</TABLE>
    
 
                                      II-2
<PAGE>   180
 
   
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
 4(a)(9)     Sixty-Fourth and              HL&P's Form 10-K for the        1-3187      4(a)(9)
             Sixty-Fifth Supplemental      year ended December 31,
             Indentures, each dated as     1995
             of July 1, 1995, to HL&P
             Mortgage and Deed of Trust
 5+          Opinion of Baker & Botts,
             L.L.P.
 8+          Form of Opinion of Baker &
             Botts, L.L.P. as to certain
             tax matters
</TABLE>
    
 
   
     There have not been filed as exhibits to this Registration Statement on
Form S-4 certain long-term debt instruments, including indentures, under which
the total amount of securities do not exceed 10 percent of the total assets of
HL&P. HL&P hereby agrees to furnish a copy of any such instrument to the SEC
upon request.
    
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(a)        Executive Benefit Plan of     HI's Form 10-Q for the          1-7629      10(a)(1)
             HI and First and Second       quarter ended March 31,                     10(a)(2)
             Amendments thereto            1987                                        and
             (effective as of June 2,                                                  10(a)(3)
             1982, July 1, 1984, May 7,
             1986, respectively)
10(b)(1)     Executive Incentive           HI's Form 10-K for the year     1-7629      10(b)
             Compensation Plan of HI       ended December 31, 1991
             (effective as of January 1,
             1982)
10(b)(2)     First Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(a)
             10(b)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
10(b)(3)     Second Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(b)(3)
             10(b)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(b)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(b)(4)
             10(b)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(c)(1)     Executive Incentive           HI's Form 10-Q for the          1-7629      10(b)(1)
             Compensation Plan of HI       quarter ended March 31,
             (effective as of January 1,   1987
             1985)
10(c)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(b)(3)
             10(c)(1) (effective as of     ended December 31, 1988
             January 1, 1985)
10(c)(3)     Second Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(c)(3)
             10(c)(1) (effective as of     ended December 31, 1991
             January 1, 1985)
10(c)(4)     Third Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(b)
             10(c)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
</TABLE>
 
                                      II-3
<PAGE>   181
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(c)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(c)(5)
             10(c)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(c)(6)     Fifth Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(c)(6)
             10(c)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(d)        Executive Incentive           HI's Form 10-Q for the          1-7629      10(b)(2)
             Compensation Plan of HL&P     quarter ended March 31,
             (effective as of January 1,   1987
             1985)
10(e)(1)     Executive Incentive           HI's Form 10-Q for the          1-7629      10(b)
             Compensation Plan of HI       quarter ended June 30, 1989
             (effective as of January 1,
             1989)
10(e)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(e)(2)
             10(e)(1) (effective as of     ended December 31, 1991
             January 1, 1989)
10(e)(3)     Second Amendment to Exhibit   HI's Form 10-Q for the          1-7629      10(c)
             10(e)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
10(e)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(c)(4)
             10(e)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(e)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(e)(5)
             10(e)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(f)(1)     Executive Incentive           HI's Form 10-K for the year     1-7629      10(b)
             Compensation Plan of HI       ended December 31, 1990
             (effective as of January 1,
             1991)
10(f)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(f)(2)
             10(f)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
10(f)(3)     Second Amendment to Exhibit   HI's Form 10-Q for the          1-7629      10(d)
             10(f)(1) (effective as of     quarter ended March 31,
             January 1, 1991)              1992
10(f)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(f)(4)
             10(f)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(f)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(f)(5)
             10(f)(1) (effective as of     ended December 31, 1992
             January 1, 1993)
10(f)(6)     Fifth Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(f)(6)
             10(f)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(f)(7)     Sixth Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(a)
             10(f)(1)                      quarter ended June 30, 1995
10(f)(8)     Seventh Amendment to          HI's Form 10-Q for the          1-7629      10(a)
             Exhibit 10(f)(1)              quarter ended June 30, 1996
</TABLE>
 
                                      II-4
<PAGE>   182
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(g)(1)     Benefit Restoration Plan of   HI's Form 10-Q for the          1-7629      10(c)
             HI (effective as of June 1,   quarter ended March 31,
             1985)                         1987
10(g)(2)     Benefit Restoration Plan of   HI's Form 10-K for the year     1-7629      10(g)(2)
             HI, as amended and restated   ended December 31, 1991
             (effective as of January 1,
             1988)
10(g)(3)     Benefit Restoration Plan of   HI's Form 10-K for the year     1-7629      10(g)(3)
             HI, as amended and restated   ended December 31, 1991
             (effective as of July 1,
             1991)
10(h)(1)     Deferred Compensation Plan    HI's Form 10-Q for the          1-7629      10(d)
             of HI (effective as of        quarter ended March 31,
             September 1, 1985)            1987
10(h)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(d)(2)
             10(h)(1) (effective as of     ended December 31, 1990
             September 1, 1985)
10(h)(3)     Second Amendment to Exhibit   HI's Form 10-Q for the          1-7629      10(e)
             10(h)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
10(h)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(h)(4)
             10(h)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(h)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(h)(5)
             10(h)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(h)(6)     Fifth Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(d)
             10(h)(1)                      quarter ended June 30, 1995
10(h)(7)     Sixth Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(b)
             10(h)(1) (effective as of     quarter ended June 30, 1996
             December 1, 1995)
10(i)(1)     Deferred Compensation Plan    HI's Form 10-Q for the          1-7629      10(a)
             of HI (effective as of        quarter ended June 30, 1989
             January 1, 1989)
10(i)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(e)(3)
             10(i)(1) (effective as of     ended December 31, 1989
             January 1, 1989)
10(i)(3)     Second Amendment to Exhibit   HI's Form 10-Q for the          1-7629      10(f)
             10(i)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
10(i)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(i)(4)
             10(i)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(i)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(i)(5)
             10(i)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(i)(6)     Fifth Amendment Exhibit       HI's Form 10-Q for the          1-7629      10(c)
             10(i)(1)                      quarter ended June 30, 1995
10(i)(7)     Sixth Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(c)
             10(i)(1) (effective as of     quarter ended June 30, 1996
             December 1, 1995)
</TABLE>
 
                                      II-5
<PAGE>   183
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(j)(1)     Deferred Compensation Plan    HI's Form 10-K for the year     1-7629      10(d)(3)
             of HI (effective as of        ended December 31, 1990
             January 1, 1991)
10(j)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(j)(2)
             10(j)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
10(j)(3)     Second Amendment to Exhibit   HI's Form 10-Q for the          1-7629      10(g)
             10(j)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
10(j)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(j)(4)
             10(j)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(j)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(j)(5)
             10(j)(1) (effective as of     ended December 31, 1993
             December 1, 1993)
10(j)(6)     Fifth Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(j)(6)
             10(j)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(j)(7)     Sixth Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(b)
             10(j)(1)                      quarter ended June 30, 1995
10(j)(8)     Seventh Amendment to          HI's Form 10-Q for the          1-7629      10(d)
             Exhibit 10(j)(1) (effective   quarter ended June 30, 1996
             as of December 1, 1995)
10(k)(1)     Long-Term Incentive           HI's Form 10-Q for the          1-7629      10(c)
             Compensation Plan of HI       quarter ended June 30, 1989
             (effective as of January 1,
             1989)
10(k)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(f)(2)
             10(k)(1) (effective as of     ended December 31, 1989
             January 1, 1990)
10(k)(3)     Second Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(k)(3)
             10(k)(1) (effective as of     ended December 31, 1992
             December 22, 1992)
10(l)        Form of stock option          HI's Form 10-Q for the          1-7629      10(h)
             agreement for nonqualified    quarter ended March 31,
             stock options granted under   1992
             HI's 1989 Long-Term
             Incentive Compensation Plan
10(m)        Forms of restricted stock     HI's Form 10-Q for the          1-7629      10(i)
             agreement for restricted      quarter ended March 31,
             stock granted under HI's      1992
             1989 Long-Term Incentive
             Compensation Plan
10(n)(1)     1994 Long-Term Incentive      HI's Form 10-K for the year     1-7629      10(n)(1)
             Compensation Plan of HI       ended December 31, 1993
             (effective as of January 1,
             1994)
</TABLE>
 
                                      II-6
<PAGE>   184
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(n)(2)     Form of Stock Option          HI's Form 10-K for the year     1-7629      10(n)(2)
             Agreement for Nonqualified    ended December 31, 1993
             Stock Options Granted under
             HI's 1994 Long-Term
             Incentive Compensation Plan
10(o)(1)     Savings Restoration Plan of   HI's Form 10-K for the year     1-7629      10(f)
             HI (effective as of January   ended December 31, 1990
             1, 1991)
10(o)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(l)(2)
             10(o)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
10(p)        Director Benefits Plan,       HI's Form 10-K for the year     1-7629      10(m)
             effective as of January 1,    ended December 31, 1991
             1992
10(q)(1)     Executive Life Insurance      HI's Form 10-K for the year     1-7629      10(q)
             Plan of HI (effective as of   ended December 31, 1993
             January 1, 1994)
10(q)(2)     First Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(e)
             10(q)(1)                      quarter ended June 30, 1995
10(r)        Employment and Supplemental   HI's Form 10-Q for the          1-7629      10(f)
             Benefits Agreement between    quarter ended March 31,
             HL&P and Hugh Rice Kelly      1987
10(s)(1)     HI's Master Savings Trust,    HI's Form 10-Q for the          1-7629      10
             as Amended and Restated       quarter ended March 31,
             effective as of January 1,    1994
             1994, between HL&P and
             Texas Commerce Bank
             National Association
10(s)(2)     First Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(a)
             10(s)(1)                      quarter ended March 31,
                                           1995
10(s)(3)     Termination of Houston        HI's Form 10-Q for the          1-7629      10(a)
             Industries Incorporated       quarter ended September 30,
             Savings Plan and Trust        1995
             Agreement as to KBLCOM
             Incorporated Effective as
             of June 30, 1995
10(s)(4)     Houston Industries            HI's Form 10-K for the year     1-7629      10(s)(4)
             Incorporated Savings Trust    ended December 31, 1995
             (As Amended and Restated
             Effective July 1, 1995)
10(s)(5)     ESOP Trust Agreement          HI's Form 10-K for the year     1-7629      10(j)(2)
             between HI and State Street   ended December 31, 1990
             Bank and Trust Company, as
             ESOP Trustee, dated October
             5, 1990
10(s)(6)     First Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(b)
             10(s)(5)                      quarter ended March 31,
                                           1995
10(s)(7)     Note Purchase Agreement       HI's Form 10-K for the year     1-7629      10(j)(3)
             between HI and the ESOP       ended December 31, 1990
             Trustee, dated as of
             October 5, 1990
</TABLE>
 
                                      II-7
<PAGE>   185
 
   
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(s)(8)     Stock Purchase Agreement      HI's Form 10-K for the year     1-7629      10(j)(4)
             between HI and the ESOP       ended December 31, 1991
             Trustee, dated as of
             October 9, 1990
10(t)        Employment Agreement dated    Form 10-K for the year          1-3187      10(t)
             April 5, 1993 between HL&P    ended December 31, 1994
             and William T. Cottle
10(u)        Form of Severance             Form 10-K for the year          1-3187      10(u)
             Agreements dated December     ended December 31, 1994
             22, 1994 between HI and (i)
             the following executive
             officers: Hugh Rice Kelly,
             R. Steve Letbetter, William
             T. Cottle and David M.
             McClanahan, and (ii) the
             following directors: Jack
             D. Greenwade, Lee W. Hogan,
             Stephen W. Nueve, Stephen
             C. Schaeffer and Robert L.
             Waldrop
10(v)        Houston Industries            HI's Form 10-K for the year     1-7629      10(z)
             Incorporated Executive        ended December 31, 1995
             Deferred Compensation
             Trust, effective as of
             December 19, 1995
10(y)        Agreement dated June 14,      HI's Form 10-K for the year     1-7629      10(aa)
             1991 between HI and David     ended December 31, 1995
             M. McClanahan
10(z)        Agreement dated June 6,       Form 10-Q for the quarter       1-7629      10(a)
             1994 between HI and Don D.    ended June 30, 1994
             Jordan
10(aa)+      Supplemental Pension
             Agreement dated July 17,
             1996 between HI and Lee W.
             Hogan
23(a)+       Consent of Deloitte &
             Touche LLP
23(b)+       Consent of Coopers &
             Lybrand L.L.P.
23(c)+       Consent of T. Milton Honea,
             Robert C. Hanna, O.
             Holcombe Crosswell and
             Joseph M. Grant as Persons
             Named to Become Directors
23(d)+       Consent of Baker & Botts,
             L.L.P. (Included in
             Exhibits 5 and 8)
24+          Powers of Attorney
99(a)+       Form of HI Proxy
99(b)+       Form of NorAm Proxy
</TABLE>
    
 
                                      II-8
<PAGE>   186
 
   
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
99(c)+       Form of Election Form (to
             be filed by amendment)
99(d)+       Consent of CS First Boston
99(e)+       Consent of Merrill Lynch
</TABLE>
    
 
     (ii) Houston Industries Incorporated
 
   
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
 2(a)        Articles of Merger of         Form 10-Q for the quarter       1-7629      2
             Houston Industries Finance,   ended June 30, 1993
             Inc. with HI, effective
             June 8, 1993
 2(b)        Agreement and Plan of         Form 8-K dated August 11,       1-7629      2(a)
             Merger dated as of August     1996
             11, 1996 among HL&P, HI,
             Merger Sub and NorAm
 3(a)        Restated Articles of          Form 10-Q for the quarter       1-7629      3
             Incorporation of HI           ended June 30, 1993
             (Restated as of May 1993)
 3(b)        Amended and Restated Bylaws   Form 10-Q for the quarter       1-7629      3
             of HI (as of May 22, 1996)    ended June 30, 1996
 4(a)(1)     Mortgage and Deed of Trust    Form S-7 of HL&P filed on      2-59748      2(b)
             dated November 1, 1944        August 25, 1977
             between HL&P and South
             Texas Commercial National
             Bank of Houston (Texas
             Commerce Bank National
             Association, as successor
             trustee), as Trustee, as
             amended and supplemented by
             20 Supplemental Indentures
             thereto
 4(a)(2)     Twenty-First through          HL&P's Form 10-K for the        1-3187      4(a)(2)
             Fiftieth Supplemental         year ended December 31,
             Indentures to HL&P Mortgage   1989
             and Deed of Trust
 4(a)(3)     Fifty-First Supplemental      HL&P's Form 10-Q for the        1-3187      4(a)
             Indenture dated March 25,     quarter ended June 30, 1991
             1991 to HL&P Mortgage and
             Deed of Trust
 4(a)(4)     Fifty-Second through Fifty-   HL&P's Form 10-Q for the        1-3187      4
             Fifth Supplemental            quarter ended March 31,
             Indentures, each dated        1992
             March 1, 1992, to HL&P
             Mortgage and Deed of Trust
</TABLE>
    
 
                                      II-9
<PAGE>   187
 
   
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
 4(a)(5)     Fifty-Sixth and               HL&P's Form 10-Q for the        1-3187      4
             Fifty-Seventh Supplemental    quarter ended September 30,
             Indentures, each dated        1992
             October 1, 1992, to HL&P
             Mortgage and Deed of Trust
 4(a)(6)     Fifty-Eighth and              HL&P's Form 10-Q for the        1-3187      4
             Fifty-Ninth Supplemental      quarter ended March 31,
             Indentures, each dated as     1993
             of March 1, 1993 to HL&P
             Mortgage and Deed of Trust
 4(a)(7)     Sixtieth Supplemental         HL&P's Form 10-Q for the        1-3187      4
             Indenture dated as of July    quarter ended June 30, 1993
             1, 1993 to HL&P Mortgage
             and Deed of Trust
 4(a)(8)     Sixty-First through           HL&P's Form 10-K for the        1-3187      4(a)(8)
             Sixty-Third Supplemental      year ended December 31,
             Indentures to HL&P Mortgage   1993
             and Deed of Trust
 4(a)(9)     Sixty-Fourth and              HL&P's Form 10-K for the        1-3187      4(a)(9)
             Sixty-Fifth Supplemental      year ended December 31,
             Indentures, each dated as     1995
             of July 1, 1995, to HL&P
             Mortgage and Deed of Trust
 4(b)(1)     Rights Agreement dated July   Form 8-K dated July 11,         1-7629      4(a)(1)
             11, 1990 between HI and       1990
             Texas Commerce Bank
             National Association, as
             Rights Agent (Rights
             Agent), which includes form
             of Statement of Resolution
             Establishing Series of
             Shares designated Series A
             Preference Stock and form
             of Rights Certificate
 4(b)(2)     Agreement and Appointment     Form 8-K dated July 11,         1-7629      4(a)(2)
             of Agent dated as of July     1990
             11, 1990 between HI and the
             Rights Agent
 4(c)        Indenture dated as of April   Form 10-Q for the quarter       1-7629      4(b)
             1, 1991 between HI and        ended June 30, 1991
             NationsBank of Texas,
             National Association, as
             Trustee
 4(d)        Agreement and Plan of         Form 8-K dated January 26,      1-7629      2(a)
             Merger dated as of January    1995
             26, 1995 among KBLCOM, HI,
             Time Warner and TW KBLCOM
             Acquisition Corp.
 5+          Opinion of Baker & Botts,
             L.L.P.
 8+          Form of Opinion of Baker &
             Botts, L.L.P. as to certain
             tax matters
</TABLE>
    
 
                                      II-10
<PAGE>   188
 
     Pursuant to Item 601(b)(4)(iii)(A) of Regulation S-K, HI has not filed as
exhibits to this Registration Statement on Form S-4 certain long-term debt
instruments, under which the total amount of securities authorized do not exceed
10 percent of the total assets of HI and its subsidiaries on a consolidated
basis. HI hereby agrees to furnish a copy of any such instrument to the SEC upon
request.
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(a)        Executive Benefit Plan of     Form 10-Q for the quarter       1-7629      10(a)(1)
             HI and First and Second       ended March 31, 1987                        10(a)(2)
             Amendments thereto                                                        and
             (effective as of June 2,                                                  10(a)(3)
             1982, July 1, 1984, May 7,
             1986, respectively)
10(b)(1)     Executive Incentive           Form 10-K for the year          1-7629      10(b)
             Compensation Plan of HI       ended December 31, 1991
             (effective as of January 1,
             1982)
10(b)(2)     First Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(a)
             10(b)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
10(b)(3)     Second Amendment to Exhibit   Form 10-K for the year          1-7629      10(b)(3)
             10(b)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(b)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(b)(4)
             10(b)(1) (effective as of     ended December 31, 1995
             September 7, 1994)
10(c)(1)     Executive Incentive           Form 10-Q for the quarter       1-7629      10(b)(1)
             Compensation Plan of HI       ended March 31, 1987
             (effective as of January 1,
             1985)
10(c)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(b)(3)
             10(c)(1) (effective as of     ended December 31, 1988
             January 1, 1985)
10(c)(3)     Second Amendment to Exhibit   Form 10-K for the year          1-7629      10(c)(3)
             10(c)(1) (effective as of     ended December 31, 1991
             January 1, 1985)
10(c)(4)     Third Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(b)
             10(c)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
10(c)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(c)(5)
             10(c)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(c)(6)     Fifth Amendment to Exhibit    Form 10-K for the year          1-7629      10(c)(6)
             10(c)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(d)        Executive Incentive           Form 10-Q for the quarter       1-7629      10(b)(2)
             Compensation Plan of HL&P     ended March 31, 1987
             (effective as of January 1,
             1985)
10(e)(1)     Executive Incentive           Form 10-Q for the quarter       1-7629      10(b)
             Compensation Plan of HI       ended June 30, 1989
             (effective as of January 1,
             1989)
</TABLE>
 
                                      II-11
<PAGE>   189
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(e)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(e)(2)
             10(e)(1) (effective as of     ended December 31, 1991
             January 1, 1989)
10(e)(3)     Second Amendment to Exhibit   Form 10-Q for the quarter       1-7629      10(c)
             10(e)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
10(e)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(c)(4)
             10(e)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(e)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(e)(5)
             10(e)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(f)(1)     Executive Incentive           Form 10-K for the year          1-7629      10(b)
             Compensation Plan of HI       ended December 31, 1990
             (effective as of January 1,
             1991)
10(f)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(f)(2)
             10(f)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
10(f)(3)     Second Amendment to Exhibit   Form 10-Q for the quarter       1-7629      10(d)
             10(f)(1) (effective as of     ended March 31, 1992
             January 1, 1991)
10(f)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(f)(4)
             10(f)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(f)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(f)(5)
             10(f)(1) (effective as of     ended December 31, 1992
             January 1, 1993)
10(f)(6)     Fifth Amendment to Exhibit    Form 10-K for the year          1-7629      10(f)(6)
             10(f)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(f)(7)     Sixth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(a)
             10(f)(1)                      ended June 30, 1995
10(f)(8)     Seventh Amendment to          Form 10-Q for the quarter       1-7629      10(a)
             Exhibit 10(f)(1)              ended June 30, 1996
10(g)(1)     Benefit Restoration Plan of   Form 10-Q for the quarter       1-7629      10(c)
             HI, (effective as of June     ended March 31, 1987
             1, 1985)
10(g)(2)     Benefit Restoration Plan of   Form 10-K for the year          1-7629      10(g)(2)
             HI, as amended and restated   ended December 31, 1991
             (effective as of January 1,
             1988)
10(g)(3)     Benefit Restoration Plan of   Form 10-K for the year          1-7629      10(g)(3)
             HI, as amended and restated   ended December 31, 1991
             (effective as of July 1,
             1991)
10(h)(1)     Deferred Compensation Plan    Form 10-Q for the quarter       1-7629      10(d)
             of HI (effective as of        ended March 31, 1987
             September 1, 1985)
10(h)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(d)(2)
             10(h)(1) (effective as of     ended December 31, 1990
             September 1, 1985)
</TABLE>
 
                                      II-12
<PAGE>   190
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(h)(3)     Second Amendment to Exhibit   Form 10-Q for the quarter       1-7629      10(e)
             10(h)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
10(h)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(h)(4)
             10(h)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(h)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(h)(5)
             10(h)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(h)(6)     Fifth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(d)
             10(h)(1)                      ended June 30, 1995
10(h)(7)     Sixth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(b)
             10(h)(1) (effective as of     ended June 30, 1996
             December 1, 1995)
10(i)(1)     Deferred Compensation Plan    Form 10-Q for the quarter       1-7629      10(a)
             of HI (effective as of        ended June 30, 1989
             January 1, 1989)
10(i)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(e)(3)
             10(i)(1) (effective as of     ended December 31, 1989
             January 1, 1989)
10(i)(3)     Second Amendment to Exhibit   Form 10-Q for the quarter       1-7629      10(f)
             10(i)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
10(i)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(i)(4)
             10(i)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(i)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(i)(5)
             10(i)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(i)(6)     Fifth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(c)
             10(i)(1)                      ended June 30, 1995
10(i)(7)     Sixth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(c)
             10(i)(1) (effective as of     ended June 30, 1996
             December 1, 1995)
10(j)(1)     Deferred Compensation Plan    Form 10-K for the year          1-7629      10(d)(3)
             of HI (effective as of        ended December 31, 1990
             January 1, 1991)
10(j)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(j)(2)
             10(j)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
10(j)(3)     Second Amendment to Exhibit   Form 10-Q for the quarter       1-7629      10(g)
             10(j)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
10(j)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(j)(4)
             10(j)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(j)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(j)(5)
             10(j)(1) (effective as of     ended December 31, 1993
             December 1, 1993)
</TABLE>
 
                                      II-13
<PAGE>   191
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(j)(6)     Fifth Amendment to Exhibit    Form 10-K for the year          1-7629      10(j)(6)
             10(j)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(j)(7)     Sixth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(b)
             10(j)(1)                      ended June 30, 1995
10(j)(8)     Seventh Amendment to          Form 10-Q for quarter ended     1-7629      10(d)
             Exhibit 10(j)(1) (effective   June 30, 1996
             as of December 1, 1995)
10(k)(1)     Long-Term Incentive           Form 10-Q for the quarter       1-7629      10(c)
             Compensation Plan of HI       ended June 30, 1989
             (effective as of January 1,
             1989)
10(k)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(f)(2)
             10(k)(1) (effective as of     ended December 31, 1989
             January 1, 1990)
10(k)(3)     Second Amendment to Exhibit   Form 10-K for the year          1-7629      10(k)(3)
             10(k)(1) (effective as of     ended December 31, 1992
             December 22, 1992)
10(l)        Form of stock option          Form 10-Q for the quarter       1-7629      10(h)
             agreement for nonqualified    ended March 31, 1992
             stock options granted under
             HI's 1989 Long-Term
             Incentive Compensation Plan
10(m)        Forms of restricted stock     Form 10-Q for the quarter       1-7629      10(i)
             agreement for restricted      ended March 31, 1992
             stock granted under HI's
             1989 Long-Term Incentive
             Compensation Plan
10(n)(1)     1994 Long-Term Incentive      Form 10-K for the year          1-7629      10(n)(1)
             Compensation Plan of HI       ended December 31, 1993
             (effective as of January 1,
             1994)
10(n)(2)     Form of stock option          Form 10-K for the year          1-7629      10(n)(2)
             agreement for non-qualified   ended December 31, 1993
             stock options granted under
             HI's 1994 Long-Term
             Incentive Compensation Plan
10(o)(1)     Savings Restoration Plan of   Form 10-K for the year          1-7629      10(f)
             HI (effective as of January   ended December 31, 1990
             1, 1991)
10(o)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(l)(2)
             10(o)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
10(p)        Director Benefits Plan        Form 10-K for the year          1-7629      10(m)
             (effective as of January 1,   ended December 31, 1991
             1992)
10(q)(1)     Executive Life Insurance      Form 10-K for the year          1-7629      10(q)
             Plan of HI (effective as of   ended December 31, 1993
             January 1, 1994)
10(q)(2)     First Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10
             10(q)(1)                      ended June 30, 1995
</TABLE>
 
                                      II-14
<PAGE>   192
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(r)        Employment and Supplemental   Form 10-Q for the quarter       1-7629      10(f)
             Benefits Agreement between    ended March 31, 1987
             HL&P and Hugh Rice Kelly
10(s)(1)     Houston Industries Master     Form 10-Q for the quarter       1-7629      10
             Savings Trust, as Amended     ended March 31, 1994
             and Restated Effective
             January 1, 1994, between HI
             and Texas Commerce Bank
             National Association
10(s)(2)     First Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(a)
             10(s)(1)                      ended March 31, 1995
10(s)(3)     Termination of Houston        Form 10-Q for the quarter       1-7629      10(a)
             Industries Incorporated       ended September 30, 1995
             Savings Plan and Trust
             Agreement as to KBLCOM
             Incorporated Effective as
             of June 30, 1995
10(s)(4)     Houston Industries            Form 10-K for the year          1-7629      10(s)(4)
             Incorporated Savings Trust    ended December 31, 1995
             (As Amended and Restated
             Effective July 1, 1995)
10(s)(5)     ESOP Trust Agreement          Form 10-K for the year          1-7629      10(j)(2)
             between HI and State Street   ended December 31, 1990
             Bank and Trust Company, as
             ESOP Trustee, dated October
             5, 1990
10(s)(6)     First Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(b)
             10(s)(5)                      ended March 31, 1995
10(s)(7)     Note Purchase Agreement       Form 10-K for the year          1-7629      10(j)(3)
             between HI and the ESOP       ended December 31, 1990
             Trustee, dated as of
             October 5, 1990
10(s)(8)     Stock Purchase Agreement      Form 10-K for the year          1-7629      10(j)(4)
             between HI and the ESOP       ended December 31, 1991
             Trustee, dated as of
             October 5, 1990
10(t)        Agreement dated June 6,       Form 10-Q for the quarter       1-7629      10(a)
             1994 between HI and Don D.    ended June 30, 1994
             Jordan
10(u)        Agreement dated June 6,       Form 10-Q for the quarter       1-7629      10(b)
             1994 between HI and Don D.    ended June 30, 1994
             Sykora
10(v)        Letter Agreement between HI   Form 10-K for the year          1-7629      10(v)
             and Jack Trotter              ended December 31, 1994
</TABLE>
 
                                      II-15
<PAGE>   193
 
   
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(w)        Form of Severance             Form 10-K for the year          1-7629      10(w)
             Agreements dated December     ended December 31, 1994
             22, 1994 between HI and
             each of the following
             executive officers: Hugh
             Rice Kelly, R. Steve
             Letbetter, David M.
             McClanahan, Lee W. Hogan
             and William T. Cottle
10(x)        Employment Agreement dated    Form 10-K for the year          1-3187      10(t)
             April 5, 1993 between HL&P    ended December 31, 1994
             and William T. Cottle
10(y)(1)     Stockholder's Agreement       Schedule 13-D dated July 6,    5-19351      2
             dated as of July 6, 1995      1995
             between HI and Time Warner
             Inc.
10(y)(2)     Registration Rights           Schedule 13-D dated July 6,    5-19351      3
             Agreement dated as of July    1995
             6, 1995 between HI and Time
             Warner Inc.
10(y)(3)     Certificate of Voting         Schedule 13-D dated July 6,    5-19351      4
             Powers, Designations,         1995
             Preferences and Relative
             Participating, Optional or
             Other Special rights, and
             Qualifications, Limitations
             or Restrictions Thereof of
             Series D. Convertible
             Preferred Stock of Time
             Warner Inc.
10(z)        Houston Industries            Form 10-K for the year          1-7629      10(z)
             Incorporated Executive        ended December 31, 1995
             Deferred Compensation
             Trust, effective as of
             December 19, 1995
10(aa)       Agreement dated June 14,      Form 10-K for the year          1-7629      10(aa)
             1991 between HI and David     ended December 31, 1995
             M. McClanahan
10(bb)+      Supplemental Pension
             Agreement dated July 17,
             1996 between HI and Lee W.
             Hogan
11(a)        Computation of Earnings Per   Form 10-K for the year          1-7629      11
             Common Share and Common       ended December 31, 1995
             Equivalent Share
11(b)        Computation of Earnings Per   Form 10-Q for the quarter       1-7629      11
             Common Share and Common       ended June 30, 1996
             Equivalent Share
21           Subsidiaries of HI            Form 10-K for the year          1-7629      21
                                           ended December 31, 1995
23(a)+       Consent of Deloitte &
             Touche LLP
</TABLE>
    
 
                                      II-16
<PAGE>   194
 
   
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
23(b)+       Consent of Coopers &
             Lybrand L.L.P.
23(c)+       Consent of T. Milton Honea,
             Robert C. Hanna, O.
             Holcombe Crosswell and
             Joseph M. Grant as Persons
             Named to Become Directors
23(d)+       Consent of Baker & Botts,
             L.L.P. (Included in
             Exhibits 5 and 8)
24+          Powers of Attorney
99(a)+       Form of HI Proxy
99(b)+       Form of NorAm Proxy
99(c)+       Form of Election Form (to
             be filed by amendment)
99(d)+       Consent of CS First Boston
99(e)+       Consent of Merrill Lynch
</TABLE>
    
 
     (b) Financial Statement Schedule
 
          Not Applicable
 
   
     (c) Reports, Opinions or Appraisals
    
 
          1.1 Opinion of CS First Boston Corporation (attached as Appendix B to
     the Joint Proxy Statement/Prospectus and incorporated by reference herein).
 
          1.2 Opinion of Merrill Lynch, Pierce, Fenner & Smith Incorporated
     (attached as Appendix C to the Joint Proxy Statement/Prospectus and
     incorporated by reference herein).
 
ITEM 22.  UNDERTAKINGS
 
     (a) The undersigned registrants hereby undertake:
 
          (1) To file, during any period on which offers or sales are being
     made, a post-effective amendment to this registration statement:
 
             (i) To include any prospectus required by section 10(a)(3) of the
        Securities Act of 1933;
 
             (ii) To reflect in the prospectus any facts or events arising after
        the effective date of the registration statement (or the most recent
        post-effective amendment thereof) which, individually or in the
        aggregate, represent a fundamental change in the information set forth
        in the registration statement. Notwithstanding the foregoing, any
        increase or decrease in volume of securities offered (if the total
        dollar value of securities offered would not exceed that which was
        registered) and any deviation from the low or high end of the estimated
        maximum offering range may be reflected in the form of prospectus filed
        with the SEC pursuant to Rule 424(b) if, in the aggregate, the changes
        in the volume and price represent no more than a 20% change in the
        maximum aggregate offering price set forth in the "Calculation of
        Registration Fee" table in the effective registration statement;
 
             (iii) To include any material information with respect to the plan
        of distribution not previously disclosed in the registration statement
        or any material change to such information in the registration
        statement;
 
provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the
registration statement is on Form S-3 or Form S-8, and the information required
to be included in a post-effective amendment by those paragraphs is contained in
periodic reports filed by the registrants pursuant to section 13 or section
15(d) of the Securities Exchange Act of 1934 that are incorporated by reference
in the registration statement.
 
                                      II-17
<PAGE>   195
 
          (2) That, for the purpose of determining any liability under the
     Securities Act of 1933, each such post-effective amendment shall be deemed
     to be a new registration statement relating to the securities offered
     therein, and the offering of such securities at that time shall be deemed
     to be the initial bona fide offering thereof.
 
          (3) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.
 
     (b) The undersigned registrants hereby undertake that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrants' annual reports pursuant to section 13(a) or section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.
 
     (c) The undersigned registrants hereby undertake as follows: that prior to
any public reoffering of the securities registered hereunder through use of a
prospectus which is a part of this registration statement, by any person or
party who is deemed to be an underwriter within the meaning of Rule 145(c), the
issuer undertakes that such reoffering prospectus will contain the information
called for by the applicable registration form with respect to reofferings by
persons who may be deemed underwriters, in addition to the information called
for by the other Items of the applicable form.
 
     (d) The registrants undertake that every prospectus (i) that is filed
pursuant to paragraph (c) immediately preceding, or (ii) that purports to meet
the requirements of section 10(a)(3) of the Act and is used in connection with
an offering of securities subject to Rule 415, will be filed as a part of an
amendment to the registration statement and will not be used until such
amendment is effective, and that, for purposes of determining any liability
under the Securities Act of 1933, each such post-effective amendment shall be
deemed to be a new registration statement relating to the securities offered
therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
 
     (e) Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons for
the registrants pursuant to the foregoing provisions, or otherwise, the
registrants have been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by either registrant of
expenses incurred or paid by a director, officer or controlling person of the
registrants in the successful defense of any action, suit or proceeding) is
asserted by such director, officer or controlling person in connection with the
securities being registered, the registrants will, unless in the opinion of its
counsel the matter has been settled by controlling precedent, submit to a court
of appropriate jurisdiction the question whether such indemnification by it is
against public policy as expressed in the Act and will be governed by the final
adjudication of such issue.
 
     (f) The undersigned registrants hereby undertake to respond to requests for
information that is incorporated by reference into the prospectus pursuant to
Items 4, 10(b), 11 or 13 of this Form, within one business day of receipt of
such request, and to send the incorporated documents by first class mail or
other equally prompt means. This includes information contained in documents
filed subsequent to the effective date of the registration statement through the
date of responding to the request.
 
     (g) The undersigned registrants hereby undertake to supply by means of a
post-effective amendment all information concerning a transaction, and the
company being acquired involved therein, that was not the subject of and
included in the registration statement when it became effective.
 
                                      II-18
<PAGE>   196
 
                                   SIGNATURES
 
   
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT, THE REGISTRANT HAS DULY
CAUSED THIS REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF BY THE
UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN THE CITY OF HOUSTON, STATE OF TEXAS,
ON OCTOBER 14, 1996.
    
 
                                          HOUSTON LIGHTING & POWER COMPANY
                                          (Registrant)
 
                                          By:       /s/  DON D. JORDAN
 
                                            ------------------------------------
                                                      (Don D. Jordan,
                                                Chairman and Chief Executive
                                                           Officer)
 
   
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES INDICATED ON OCTOBER 14, 1996.
    
 
   
<TABLE>
<CAPTION>
                  SIGNATURE                                        TITLE
- ---------------------------------------------  ----------------------------------------------
<C>                                            <S>
           /s/  DON D. JORDAN                  Chairman and Chief Executive Officer and
- ---------------------------------------------    Director (Principal Executive Officer and
               (Don D. Jordan)                   Principal Financial Officer)

       /s/  MARY P. RICCIARDELLO               Vice President and Comptroller
- ---------------------------------------------    (Principal Accounting Officer)
           (Mary P. Ricciardello)

         /s/  WILLIAM T. COTTLE                Director
- ---------------------------------------------
             (William T. Cottle)

         /s/  CHARLES R. CRISP                 Director
- ---------------------------------------------
             (Charles R. Crisp)

                      *                        Director
- ---------------------------------------------
             (Jack D. Greenwade)

                      *                        Director
- ---------------------------------------------
               (Lee W. Hogan)

          /s/  HUGH RICE KELLY                 Director
- ---------------------------------------------
              (Hugh Rice Kelly)

        /s/  R. STEVE LETBETTER                Director
- ---------------------------------------------
            (R. Steve Letbetter)

       /s/  DAVID M. MCCLANAHANY                Director
- ---------------------------------------------
            (David M. McClanahan)

         /s/  STEPHEN W. NAEVE                 Director
- ---------------------------------------------
             (Stephen W. Naeve)

          /s/  S.C. SCHAEFFER                  Director
- ---------------------------------------------
              (S.C. Schaeffer)

                      *                        Director
- ---------------------------------------------
               (R. L. Waldrop)

*By           HUGH RICE KELLY
- ---------------------------------------------
              (Hugh Rice Kelly)
              Attorney-in-Fact
</TABLE>
    
 
                                      II-19
<PAGE>   197
 
                                   SIGNATURES
 
   
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT, THE REGISTRANT HAS DULY
CAUSED THIS REGISTRATION STATEMENT TO BE SIGNED ON ITS BEHALF BY THE
UNDERSIGNED, THEREUNTO DULY AUTHORIZED, IN THE CITY OF HOUSTON, STATE OF TEXAS,
ON OCTOBER 14, 1996.
    
 
                                          HOUSTON INDUSTRIES INCORPORATED
                                          (Registrant)
 
                                          By:       /s/  DON D. JORDAN
 
                                            ------------------------------------
                                                      (Don D. Jordan,
                                             Chairman, Chief Executive Officer
                                                        and President)
 
   
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE
CAPACITIES INDICATED ON OCTOBER 14, 1996.
    
 
   
<TABLE>
<CAPTION>
                  SIGNATURE                                        TITLE
- ---------------------------------------------  ----------------------------------------------
<C>                                            <S>
           /s/  DON D. JORDAN                  Chairman, Chief Executive Officer and
- ---------------------------------------------    President and Director (Principal Executive
               (Don D. Jordan)                   Officer)

         /s/  STEPHEN W. NAEVE                 Senior Vice President and Chief Financial
- ---------------------------------------------    Officer (Principal Financial Officer)
             (Stephen W. Naeve)

       /s/  MARY P. RICCIARDELLO               Vice President and Comptroller
- ---------------------------------------------    (Principal Accounting Officer)
           (Mary P. Ricciardello)

                    *                          Director
- ---------------------------------------------
            (James A. Baker, III)

                    *                          Director
- ---------------------------------------------
           (Richard E. Balzhiser)

                    *                          Director
- ---------------------------------------------
              (Milton Carroll)

                    *                          Director
- ---------------------------------------------
               (John T. Cater)

                    *                          Director
- ---------------------------------------------
           (Robert J. Cruikshank)

                    *                          Director
- ---------------------------------------------
              (Linnet F. Deily)

                    *                          Director
- ---------------------------------------------
               (Lee W. Hogan)

                    *                          Director
- ---------------------------------------------
              (Howard W. Horne)
</TABLE>
    
 
                                      II-20
<PAGE>   198
 
   
<TABLE>
<CAPTION>
                  SIGNATURE                                        TITLE
- ---------------------------------------------  ----------------------------------------------
<C>                                            <S>
        /s/  R. STEVE LETBETTER                Director
- ---------------------------------------------
            (R. Steve Letbetter)

                     *                         Director
- ---------------------------------------------
            (Alexander F. Schilt)

                     *                         Director
- ---------------------------------------------
              (Jack T. Trotter)

                     *                         Director
- ---------------------------------------------
               (Bertram Wolfe)

* By           HUGH RICE KELLY
     ----------------------------------------
              (Hugh Rice Kelly)
              Attorney-in-Fact
</TABLE>
    
 
                                      II-21
<PAGE>   199
 
                               INDEX TO EXHIBITS
 
     Exhibits not incorporated by reference to a prior filing are designated by
a cross (+); all exhibits not so designated are incorporated herein by reference
to a prior filing as indicated. Exhibits designated by an asterisk (*) have been
previously filed.
 
     (i) Houston Lighting & Power Company
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
 2(a)        Articles of Merger of         Form 10-Q for the quarter       1-3187      2
             Utility Fuels, Inc. with      ended September 30, 1993
             HL&P, effective October 8,
             1993
 2(b)        Agreement and Plan of         Form 8-K dated August 11,       1-3187      2(a)
             Merger dated as of August     1996
             11, 1996 among HL&P, HI,
             Merger Sub and NorAm
 3(a)        Restated Articles of          Form 10-Q for the quarter       1-3187      3
             Incorporation of HL&P dated   ended June 30, 1993
             May 11, 1993
 3(b)+*      Articles of Amendment to
             the Articles of
             Incorporation of HL&P dated
             August 9, 1996
 3(c)+       Form of Articles of
             Amendment to the Articles
             of Incorporation of HL&P
 3(d)        Amended and Restated Bylaws   Form 10-Q for the quarter       1-3187      3
             of HL&P (as of June 5,        ended June 30, 1996
             1996)
 4(a)(1)     Mortgage and Deed of Trust    Form S-7 filed on August       2-59748      2(b)
             dated November 1, 1944        25, 1977
             between HL&P and South
             Texas Commercial National
             Bank of Houston (Texas
             Commerce Bank National
             Association, as successor
             trustee), as Trustee, as
             amended and supplemented by
             20 Supplemental Indentures
             thereto
 4(a)(2)     Twenty-First through          Form 10-K for the year          1-3187      4(a)(2)
             Fiftieth Supplemental         ended December 31, 1989
             Indentures to HL&P Mortgage
             and Deed of Trust
 4(a)(3)     Fifty-First Supplemental      Form 10-Q for the quarter       1-3187      4(a)
             Indenture dated March 25,     ended June 30, 1991
             1991 to HL&P Mortgage and
             Deed of Trust
 4(a)(4)     Fifty-Second through Fifty-   Form 10-Q for the quarter       1-3187      4
             Fifth Supplemental            ended March 31, 1992
             Indentures, each dated
             March 1, 1992, to HL&P
             Mortgage and Deed of Trust
</TABLE>
<PAGE>   200
 
   
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
 4(a)(5)     Fifty-Sixth and               Form 10-Q for the quarter       1-3187      4
             Fifty-Seventh Supplemental    ended September 30, 1992
             Indentures, each dated
             October 1, 1992, to HL&P
             Mortgage and Deed of Trust
 4(a)(6)     Fifty-Eighth and              Form 10-Q for the quarter       1-3187      4
             Fifty-Ninth Supplemental      ended March 31, 1993
             Indentures, each dated
             March 1, 1993, to HL&P
             Mortgage and Deed of Trust
 4(a)(7)     Sixtieth Supplemental         Form 10-Q for the quarter       1-3187      4
             Indenture dated as of July    ended June 30, 1993
             1, 1993 to HL&P Mortgage
             and Deed of Trust
 4(a)(8)     Sixty-First through           HL&P's Form 10-K for the        1-3187      4(a)(8)
             Sixty-Third Supplemental      year ended December 31,
             Indentures to HL&P Mortgage   1993
             and Deed of Trust
 4(a)(9)     Sixty-Fourth and              HL&P's Form 10-K for the        1-3187      4(a)(9)
             Sixty-Fifth Supplemental      year ended December 31,
             Indentures, each dated as     1995
             of July 1, 1995, to HL&P
             Mortgage and Deed of Trust
 5+          Opinion of Baker & Botts,
             L.L.P.
 8+          Form of Opinion of Baker &
             Botts, L.L.P. as to certain
             tax matters
</TABLE>
    
 
   
     There have not been filed as exhibits to this Registration Statement on
Form S-4 certain long-term debt instruments, including indentures, under which
the total amount of securities do not exceed 10 percent of the total assets of
HL&P. HL&P hereby agrees to furnish a copy of any such instrument to the SEC
upon request.
    
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(a)        Executive Benefit Plan of     HI's Form 10-Q for the          1-7629      10(a)(1)
             HI and First and Second       quarter ended March 31,                     10(a)(2)
             Amendments thereto            1987                                        and
             (effective as of June 2,                                                  10(a)(3)
             1982, July 1, 1984, May 7,
             1986, respectively)
10(b)(1)     Executive Incentive           HI's Form 10-K for the year     1-7629      10(b)
             Compensation Plan of HI       ended December 31, 1991
             (effective as of January 1,
             1982)
10(b)(2)     First Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(a)
             10(b)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
</TABLE>
<PAGE>   201
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(b)(3)     Second Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(b)(3)
             10(b)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
</TABLE>
<PAGE>   202
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(b)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(b)(4)
             10(b)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(c)(1)     Executive Incentive           HI's Form 10-Q for the          1-7629      10(b)(1)
             Compensation Plan of HI       quarter ended March 31,
             (effective as of January 1,   1987
             1985)
10(c)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(b)(3)
             10(c)(1) (effective as of     ended December 31, 1988
             January 1, 1985)
10(c)(3)     Second Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(c)(3)
             10(c)(1) (effective as of     ended December 31, 1991
             January 1, 1985)
10(c)(4)     Third Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(b)
             10(c)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
10(c)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(c)(5)
             10(c)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(c)(6)     Fifth Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(c)(6)
             10(c)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(d)        Executive Incentive           HI's Form 10-Q for the          1-7629      10(b)(2)
             Compensation Plan of HL&P     quarter ended March 31,
             (effective as of January 1,   1987
             1985)
10(e)(1)     Executive Incentive           HI's Form 10-Q for the          1-7629      10(b)
             Compensation Plan of HI       quarter ended June 30, 1989
             (effective as of January 1,
             1989)
10(e)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(e)(2)
             10(e)(1) (effective as of     ended December 31, 1991
             January 1, 1989)
10(e)(3)     Second Amendment to Exhibit   HI's Form 10-Q for the          1-7629      10(c)
             10(e)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
10(e)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(c)(4)
             10(e)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(e)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(e)(5)
             10(e)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(f)(1)     Executive Incentive           HI's Form 10-K for the year     1-7629      10(b)
             Compensation Plan of HI       ended December 31, 1990
             (effective as of January 1,
             1991)
10(f)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(f)(2)
             10(f)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
</TABLE>
<PAGE>   203
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(f)(3)     Second Amendment to Exhibit   HI's Form 10-Q for the          1-7629      10(d)
             10(f)(1) (effective as of     quarter ended March 31,
             January 1, 1991)              1992
10(f)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(f)(4)
             10(f)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(f)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(f)(5)
             10(f)(1) (effective as of     ended December 31, 1992
             January 1, 1993)
10(f)(6)     Fifth Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(f)(6)
             10(f)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(f)(7)     Sixth Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(a)
             10(f)(1)                      quarter ended June 30, 1995
10(f)(8)     Seventh Amendment to          HI's Form 10-Q for the          1-7629      10(a)
             Exhibit 10(f)(1)              quarter ended June 30, 1996
10(g)(1)     Benefit Restoration Plan of   HI's Form 10-Q for the          1-7629      10(c)
             HI (effective as of June 1,   quarter ended March 31,
             1985)                         1987
10(g)(2)     Benefit Restoration Plan of   HI's Form 10-K for the year     1-7629      10(g)(2)
             HI, as amended and restated   ended December 31, 1991
             (effective as of January 1,
             1988)
10(g)(3)     Benefit Restoration Plan of   HI's Form 10-K for the year     1-7629      10(g)(3)
             HI, as amended and restated   ended December 31, 1991
             (effective as of July 1,
             1991)
10(h)(1)     Deferred Compensation Plan    HI's Form 10-Q for the          1-7629      10(d)
             of HI (effective as of        quarter ended March 31,
             September 1, 1985)            1987
10(h)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(d)(2)
             10(h)(1) (effective as of     ended December 31, 1990
             September 1, 1985)
10(h)(3)     Second Amendment to Exhibit   HI's Form 10-Q for the          1-7629      10(e)
             10(h)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
10(h)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(h)(4)
             10(h)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(h)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(h)(5)
             10(h)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(h)(6)     Fifth Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(d)
             10(h)(1)                      quarter ended June 30, 1995
10(h)(7)     Sixth Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(b)
             10(h)(1) (effective as of     quarter ended June 30, 1996
             December 1, 1995)
10(i)(1)     Deferred Compensation Plan    HI's Form 10-Q for the          1-7629      10(a)
             of HI (effective as of        quarter ended June 30, 1989
             January 1, 1989)
</TABLE>
<PAGE>   204
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(i)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(e)(3)
             10(i)(1) (effective as of     ended December 31, 1989
             January 1, 1989)
10(i)(3)     Second Amendment to Exhibit   HI's Form 10-Q for the          1-7629      10(f)
             10(i)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
10(i)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(i)(4)
             10(i)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(i)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(i)(5)
             10(i)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(i)(6)     Fifth Amendment Exhibit       HI's Form 10-Q for the          1-7629      10(c)
             10(i)(1)                      quarter ended June 30, 1995
10(i)(7)     Sixth Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(c)
             10(i)(1) (effective as of     quarter ended June 30, 1996
             December 1, 1995)
10(j)(1)     Deferred Compensation Plan    HI's Form 10-K for the year     1-7629      10(d)(3)
             of HI (effective as of        ended December 31, 1990
             January 1, 1991)
10(j)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(j)(2)
             10(j)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
10(j)(3)     Second Amendment to Exhibit   HI's Form 10-Q for the          1-7629      10(g)
             10(j)(1) (effective as of     quarter ended March 31,
             March 30, 1992)               1992
10(j)(4)     Third Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(j)(4)
             10(j)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(j)(5)     Fourth Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(j)(5)
             10(j)(1) (effective as of     ended December 31, 1993
             December 1, 1993)
10(j)(6)     Fifth Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(j)(6)
             10(j)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(j)(7)     Sixth Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(b)
             10(j)(1)                      quarter ended June 30, 1995
10(j)(8)     Seventh Amendment to          HI's Form 10-Q for the          1-7629      10(d)
             Exhibit 10(j)(1) (effective   quarter ended June 30, 1996
             as of December 1, 1995)
10(k)(1)     Long-Term Incentive           HI's Form 10-Q for the          1-7629      10(c)
             Compensation Plan of HI       quarter ended June 30, 1989
             (effective as of January 1,
             1989)
10(k)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(f)(2)
             10(k)(1) (effective as of     ended December 31, 1989
             January 1, 1990)
10(k)(3)     Second Amendment to Exhibit   HI's Form 10-K for the year     1-7629      10(k)(3)
             10(k)(1) (effective as of     ended December 31, 1992
             December 22, 1992)
</TABLE>
<PAGE>   205
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(l)        Form of stock option          HI's Form 10-Q for the          1-7629      10(h)
             agreement for nonqualified    quarter ended March 31,
             stock options granted under   1992
             HI's 1989 Long-Term
             Incentive Compensation Plan
10(m)        Forms of restricted stock     HI's Form 10-Q for the          1-7629      10(i)
             agreement for restricted      quarter ended March 31,
             stock granted under HI's      1992
             1989 Long-Term Incentive
             Compensation Plan
10(n)(1)     1994 Long-Term Incentive      HI's Form 10-K for the year     1-7629      10(n)(1)
             Compensation Plan of HI       ended December 31, 1993
             (effective as of January 1,
             1994)
10(n)(2)     Form of Stock Option          HI's Form 10-K for the year     1-7629      10(n)(2)
             Agreement for Nonqualified    ended December 31, 1993
             Stock Options Granted under
             HI's 1994 Long-Term
             Incentive Compensation Plan
10(o)(1)     Savings Restoration Plan of   HI's Form 10-K for the year     1-7629      10(f)
             HI (effective as of January   ended December 31, 1990
             1, 1991)
10(o)(2)     First Amendment to Exhibit    HI's Form 10-K for the year     1-7629      10(l)(2)
             10(o)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
10(p)        Director Benefits Plan,       HI's Form 10-K for the year     1-7629      10(m)
             effective as of January 1,    ended December 31, 1991
             1992
10(q)(1)     Executive Life Insurance      HI's Form 10-K for the year     1-7629      10(q)
             Plan of HI (effective as of   ended December 31, 1993
             January 1, 1994)
10(q)(2)     First Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(e)
             10(q)(1)                      quarter ended June 30, 1995
10(r)        Employment and Supplemental   HI's Form 10-Q for the          1-7629      10(f)
             Benefits Agreement between    quarter ended March 31,
             HL&P and Hugh Rice Kelly      1987
10(s)(1)     HI's Master Savings Trust,    HI's Form 10-Q for the          1-7629      10
             as Amended and Restated       quarter ended March 31,
             effective as of January 1,    1994
             1994, between HL&P and
             Texas Commerce Bank
             National Association
10(s)(2)     First Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(a)
             10(s)(1)                      quarter ended March 31,
                                           1995
10(s)(3)     Termination of Houston        HI's Form 10-Q for the          1-7629      10(a)
             Industries Incorporated       quarter ended September 30,
             Savings Plan and Trust        1995
             Agreement as to KBLCOM
             Incorporated Effective as
             of June 30, 1995
</TABLE>
<PAGE>   206
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(s)(4)     Houston Industries            HI's Form 10-K for the year     1-7629      10(s)(4)
             Incorporated Savings Trust    ended December 31, 1995
             (As Amended and Restated
             Effective July 1, 1995)
10(s)(5)     ESOP Trust Agreement          HI's Form 10-K for the year     1-7629      10(j)(2)
             between HI and State Street   ended December 31, 1990
             Bank and Trust Company, as
             ESOP Trustee, dated October
             5, 1990
10(s)(6)     First Amendment to Exhibit    HI's Form 10-Q for the          1-7629      10(b)
             10(s)(5)                      quarter ended March 31,
                                           1995
10(s)(7)     Note Purchase Agreement       HI's Form 10-K for the year     1-7629      10(j)(3)
             between HI and the ESOP       ended December 31, 1990
             Trustee, dated as of
             October 5, 1990
10(s)(8)     Stock Purchase Agreement      HI's Form 10-K for the year     1-7629      10(j)(4)
             between HI and the ESOP       ended December 31, 1991
             Trustee, dated as of
             October 9, 1990
10(t)        Employment Agreement dated    Form 10-K for the year          1-3187      10(t)
             April 5, 1993 between HL&P    ended December 31, 1994
             and William T. Cottle
10(u)        Form of Severance             Form 10-K for the year          1-3187      10(u)
             Agreements dated December     ended December 31, 1994
             22, 1994 between HI and (i)
             the following executive
             officers: Hugh Rice Kelly,
             R. Steve Letbetter, William
             T. Cottle and David M.
             McClanahan, and (ii) the
             following directors: Jack
             D. Greenwade, Lee W. Hogan,
             Stephen W. Nueve, Stephen
             C. Schaeffer and Robert L.
             Waldrop
10(v)        Houston Industries            HI's Form 10-K for the year     1-7629      10(z)
             Incorporated Executive        ended December 31, 1995
             Deferred Compensation
             Trust, effective as of
             December 19, 1995
10(y)        Agreement dated June 14,      HI's Form 10-K for the year     1-7629      10(aa)
             1991 between HI and David     ended December 31, 1995
             M. McClanahan
10(z)        Agreement dated June 6,       Form 10-Q for the quarter       1-7629      10(a)
             1994 between HI and Don D.    ended June 30, 1994
             Jordan
10(aa)+      Supplemental Pension
             Agreement dated July 17,
             1996 between HI and Lee W.
             Hogan
23(a)+       Consent of Deloitte &
             Touche LLP
</TABLE>
<PAGE>   207
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
23(b)+       Consent of Coopers &
             Lybrand L.L.P.
23(c)+       Consent of T. Milton Honea,
             Robert C. Hanna, O.
             Holcombe Crosswell and
             Joseph M. Grant as Persons
             Named to Become Directors
23(d)+       Consent of Baker & Botts,
             L.L.P. (Included in
             Exhibits 5 and 8)
24+          Powers of Attorney
99(a)+       Form of HI Proxy
99(b)+       Form of NorAm Proxy
99(c)+       Form of Election Form (to
             be filed by amendment)
99(d)+       Consent of CS First Boston
99(e)+       Consent of Merrill Lynch
</TABLE>
 
     (ii) Houston Industries Incorporated
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
 2(a)        Articles of Merger of         Form 10-Q for the quarter       1-7629      2
             Houston Industries Finance,   ended June 30, 1993
             Inc. with HI, effective
             June 8, 1993
 2(b)        Agreement and Plan of         Form 8-K dated August 11,       1-7629      2(a)
             Merger dated as of August     1996
             11, 1996 among HL&P, HI,
             Merger Sub and NorAm
 3(a)        Restated Articles of          Form 10-Q for the quarter       1-7629      3
             Incorporation of HI           ended June 30, 1993
             (Restated as of May 1993)
 3(b)        Amended and Restated Bylaws   Form 10-Q for the quarter       1-7629      3
             of HI (as of May 22, 1996)    ended June 30, 1996
 4(a)(1)     Mortgage and Deed of Trust    Form S-7 of HL&P filed on      2-59748      2(b)
             dated November 1, 1944        August 25, 1977
             between HL&P and South
             Texas Commercial National
             Bank of Houston (Texas
             Commerce Bank National
             Association, as successor
             trustee), as Trustee, as
             amended and supplemented by
             20 Supplemental Indentures
             thereto
 4(a)(2)     Twenty-First through          HL&P's Form 10-K for the        1-3187      4(a)(2)
             Fiftieth Supplemental         year ended December 31,
             Indentures to HL&P Mortgage   1989
             and Deed of Trust
</TABLE>
<PAGE>   208
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
 4(a)(3)     Fifty-First Supplemental      HL&P's Form 10-Q for the        1-3187      4(a)
             Indenture dated March 25,     quarter ended June 30, 1991
             1991 to HL&P Mortgage and
             Deed of Trust
 4(a)(4)     Fifty-Second through Fifty-   HL&P's Form 10-Q for the        1-3187      4
             Fifth Supplemental            quarter ended March 31,
             Indentures, each dated        1992
             March 1, 1992, to HL&P
             Mortgage and Deed of Trust
 4(a)(5)     Fifty-Sixth and               HL&P's Form 10-Q for the        1-3187      4
             Fifty-Seventh Supplemental    quarter ended September 30,
             Indentures, each dated        1992
             October 1, 1992, to HL&P
             Mortgage and Deed of Trust
 4(a)(6)     Fifty-Eighth and              HL&P's Form 10-Q for the        1-3187      4
             Fifty-Ninth Supplemental      quarter ended March 31,
             Indentures, each dated as     1993
             of March 1, 1993 to HL&P
             Mortgage and Deed of Trust
 4(a)(7)     Sixtieth Supplemental         HL&P's Form 10-Q for the        1-3187      4
             Indenture dated as of July    quarter ended June 30, 1993
             1, 1993 to HL&P Mortgage
             and Deed of Trust
 4(a)(8)     Sixty-First through           HL&P's Form 10-K for the        1-3187      4(a)(8)
             Sixty-Third Supplemental      year ended December 31,
             Indentures to HL&P Mortgage   1993
             and Deed of Trust
 4(a)(9)     Sixty-Fourth and              HL&P's Form 10-K for the        1-3187      4(a)(9)
             Sixty-Fifth Supplemental      year ended December 31,
             Indentures, each dated as     1995
             of July 1, 1995, to HL&P
             Mortgage and Deed of Trust
 4(b)(1)     Rights Agreement dated July   Form 8-K dated July 11,         1-7629      4(a)(1)
             11, 1990 between HI and       1990
             Texas Commerce Bank
             National Association, as
             Rights Agent (Rights
             Agent), which includes form
             of Statement of Resolution
             Establishing Series of
             Shares designated Series A
             Preference Stock and form
             of Rights Certificate
 4(b)(2)     Agreement and Appointment     Form 8-K dated July 11,         1-7629      4(a)(2)
             of Agent dated as of July     1990
             11, 1990 between HI and the
             Rights Agent
 4(c)        Indenture dated as of April   Form 10-Q for the quarter       1-7629      4(b)
             1, 1991 between HI and        ended June 30, 1991
             NationsBank of Texas,
             National Association, as
             Trustee
</TABLE>
<PAGE>   209
 
   
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
 4(d)        Agreement and Plan of         Form 8-K dated January 26,      1-7629      2(a)
             Merger dated as of January    1995
             26, 1995 among KBLCOM, HI,
             Time Warner and TW KBLCOM
             Acquisition Corp.
 5+          Opinion of Baker & Botts,
             L.L.P.
 8+          Form of Opinion of Baker &
             Botts, L.L.P. as to certain
             tax matters
</TABLE>
    
 
     Pursuant to Item 601(b)(4)(iii)(A) of Regulation S-K, HI has not filed as
exhibits to this Registration Statement on Form S-4 certain long-term debt
instruments, under which the total amount of securities authorized do not exceed
10 percent of the total assets of HI and its subsidiaries on a consolidated
basis. HI hereby agrees to furnish a copy of any such instrument to the SEC upon
request.
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(a)        Executive Benefit Plan of     Form 10-Q for the quarter       1-7629      10(a)(1)
             HI and First and Second       ended March 31, 1987                        10(a)(2)
             Amendments thereto                                                        and
             (effective as of June 2,                                                  10(a)(3)
             1982, July 1, 1984, May 7,
             1986, respectively)
10(b)(1)     Executive Incentive           Form 10-K for the year          1-7629      10(b)
             Compensation Plan of HI       ended December 31, 1991
             (effective as of January 1,
             1982)
10(b)(2)     First Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(a)
             10(b)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
10(b)(3)     Second Amendment to Exhibit   Form 10-K for the year          1-7629      10(b)(3)
             10(b)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(b)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(b)(4)
             10(b)(1) (effective as of     ended December 31, 1995
             September 7, 1994)
10(c)(1)     Executive Incentive           Form 10-Q for the quarter       1-7629      10(b)(1)
             Compensation Plan of HI       ended March 31, 1987
             (effective as of January 1,
             1985)
10(c)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(b)(3)
             10(c)(1) (effective as of     ended December 31, 1988
             January 1, 1985)
10(c)(3)     Second Amendment to Exhibit   Form 10-K for the year          1-7629      10(c)(3)
             10(c)(1) (effective as of     ended December 31, 1991
             January 1, 1985)
10(c)(4)     Third Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(b)
             10(c)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
</TABLE>
<PAGE>   210
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(c)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(c)(5)
             10(c)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(c)(6)     Fifth Amendment to Exhibit    Form 10-K for the year          1-7629      10(c)(6)
             10(c)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(d)        Executive Incentive           Form 10-Q for the quarter       1-7629      10(b)(2)
             Compensation Plan of HL&P     ended March 31, 1987
             (effective as of January 1,
             1985)
10(e)(1)     Executive Incentive           Form 10-Q for the quarter       1-7629      10(b)
             Compensation Plan of HI       ended June 30, 1989
             (effective as of January 1,
             1989)
10(e)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(e)(2)
             10(e)(1) (effective as of     ended December 31, 1991
             January 1, 1989)
10(e)(3)     Second Amendment to Exhibit   Form 10-Q for the quarter       1-7629      10(c)
             10(e)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
10(e)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(c)(4)
             10(e)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(e)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(e)(5)
             10(e)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(f)(1)     Executive Incentive           Form 10-K for the year          1-7629      10(b)
             Compensation Plan of HI       ended December 31, 1990
             (effective as of January 1,
             1991)
10(f)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(f)(2)
             10(f)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
10(f)(3)     Second Amendment to Exhibit   Form 10-Q for the quarter       1-7629      10(d)
             10(f)(1) (effective as of     ended March 31, 1992
             January 1, 1991)
10(f)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(f)(4)
             10(f)(1) (effective as of     ended December 31, 1992
             November 4, 1992)
10(f)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(f)(5)
             10(f)(1) (effective as of     ended December 31, 1992
             January 1, 1993)
10(f)(6)     Fifth Amendment to Exhibit    Form 10-K for the year          1-7629      10(f)(6)
             10(f)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(f)(7)     Sixth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(a)
             10(f)(1)                      ended June 30, 1995
10(f)(8)     Seventh Amendment to          Form 10-Q for the quarter       1-7629      10(a)
             Exhibit 10(f)(1)              ended June 30, 1996
</TABLE>
<PAGE>   211
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(g)(1)     Benefit Restoration Plan of   Form 10-Q for the quarter       1-7629      10(c)
             HI, (effective as of June     ended March 31, 1987
             1, 1985)
10(g)(2)     Benefit Restoration Plan of   Form 10-K for the year          1-7629      10(g)(2)
             HI, as amended and restated   ended December 31, 1991
             (effective as of January 1,
             1988)
10(g)(3)     Benefit Restoration Plan of   Form 10-K for the year          1-7629      10(g)(3)
             HI, as amended and restated   ended December 31, 1991
             (effective as of July 1,
             1991)
10(h)(1)     Deferred Compensation Plan    Form 10-Q for the quarter       1-7629      10(d)
             of HI (effective as of        ended March 31, 1987
             September 1, 1985)
10(h)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(d)(2)
             10(h)(1) (effective as of     ended December 31, 1990
             September 1, 1985)
10(h)(3)     Second Amendment to Exhibit   Form 10-Q for the quarter       1-7629      10(e)
             10(h)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
10(h)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(h)(4)
             10(h)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(h)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(h)(5)
             10(h)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(h)(6)     Fifth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(d)
             10(h)(1)                      ended June 30, 1995
10(h)(7)     Sixth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(b)
             10(h)(1) (effective as of     ended June 30, 1996
             December 1, 1995)
10(i)(1)     Deferred Compensation Plan    Form 10-Q for the quarter       1-7629      10(a)
             of HI (effective as of        ended June 30, 1989
             January 1, 1989)
10(i)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(e)(3)
             10(i)(1) (effective as of     ended December 31, 1989
             January 1, 1989)
10(i)(3)     Second Amendment to Exhibit   Form 10-Q for the quarter       1-7629      10(f)
             10(i)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
10(i)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(i)(4)
             10(i)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(i)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(i)(5)
             10(i)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(i)(6)     Fifth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(c)
             10(i)(1)                      ended June 30, 1995
10(i)(7)     Sixth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(c)
             10(i)(1) (effective as of     ended June 30, 1996
             December 1, 1995)
</TABLE>
<PAGE>   212
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(j)(1)     Deferred Compensation Plan    Form 10-K for the year          1-7629      10(d)(3)
             of HI (effective as of        ended December 31, 1990
             January 1, 1991)
10(j)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(j)(2)
             10(j)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
10(j)(3)     Second Amendment to Exhibit   Form 10-Q for the quarter       1-7629      10(g)
             10(j)(1) (effective as of     ended March 31, 1992
             March 30, 1992)
10(j)(4)     Third Amendment to Exhibit    Form 10-K for the year          1-7629      10(j)(4)
             10(j)(1) (effective as of     ended December 31, 1993
             June 2, 1993)
10(j)(5)     Fourth Amendment to Exhibit   Form 10-K for the year          1-7629      10(j)(5)
             10(j)(1) (effective as of     ended December 31, 1993
             December 1, 1993)
10(j)(6)     Fifth Amendment to Exhibit    Form 10-K for the year          1-7629      10(j)(6)
             10(j)(1) (effective as of     ended December 31, 1994
             September 7, 1994)
10(j)(7)     Sixth Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(b)
             10(j)(1)                      ended June 30, 1995
10(j)(8)     Seventh Amendment to          Form 10-Q for quarter ended     1-7629      10(d)
             Exhibit 10(j)(1) (effective   June 30, 1996
             as of December 1, 1995)
10(k)(1)     Long-Term Incentive           Form 10-Q for the quarter       1-7629      10(c)
             Compensation Plan of HI       ended June 30, 1989
             (effective as of January 1,
             1989)
10(k)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(f)(2)
             10(k)(1) (effective as of     ended December 31, 1989
             January 1, 1990)
10(k)(3)     Second Amendment to Exhibit   Form 10-K for the year          1-7629      10(k)(3)
             10(k)(1) (effective as of     ended December 31, 1992
             December 22, 1992)
10(l)        Form of stock option          Form 10-Q for the quarter       1-7629      10(h)
             agreement for nonqualified    ended March 31, 1992
             stock options granted under
             HI's 1989 Long-Term
             Incentive Compensation Plan
10(m)        Forms of restricted stock     Form 10-Q for the quarter       1-7629      10(i)
             agreement for restricted      ended March 31, 1992
             stock granted under HI's
             1989 Long-Term Incentive
             Compensation Plan
10(n)(1)     1994 Long-Term Incentive      Form 10-K for the year          1-7629      10(n)(1)
             Compensation Plan of HI       ended December 31, 1993
             (effective as of January 1,
             1994)
</TABLE>
<PAGE>   213
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(n)(2)     Form of stock option          Form 10-K for the year          1-7629      10(n)(2)
             agreement for non-qualified   ended December 31, 1993
             stock options granted under
             HI's 1994 Long-Term
             Incentive Compensation Plan
10(o)(1)     Savings Restoration Plan of   Form 10-K for the year          1-7629      10(f)
             HI (effective as of January   ended December 31, 1990
             1, 1991)
10(o)(2)     First Amendment to Exhibit    Form 10-K for the year          1-7629      10(l)(2)
             10(o)(1) (effective as of     ended December 31, 1991
             January 1, 1991)
10(p)        Director Benefits Plan        Form 10-K for the year          1-7629      10(m)
             (effective as of January 1,   ended December 31, 1991
             1992)
10(q)(1)     Executive Life Insurance      Form 10-K for the year          1-7629      10(q)
             Plan of HI (effective as of   ended December 31, 1993
             January 1, 1994)
10(q)(2)     First Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10
             10(q)(1)                      ended June 30, 1995
10(r)        Employment and Supplemental   Form 10-Q for the quarter       1-7629      10(f)
             Benefits Agreement between    ended March 31, 1987
             HL&P and Hugh Rice Kelly
10(s)(1)     Houston Industries Master     Form 10-Q for the quarter       1-7629      10
             Savings Trust, as Amended     ended March 31, 1994
             and Restated Effective
             January 1, 1994, between HI
             and Texas Commerce Bank
             National Association
10(s)(2)     First Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(a)
             10(s)(1)                      ended March 31, 1995
10(s)(3)     Termination of Houston        Form 10-Q for the quarter       1-7629      10(a)
             Industries Incorporated       ended September 30, 1995
             Savings Plan and Trust
             Agreement as to KBLCOM
             Incorporated Effective as
             of June 30, 1995
10(s)(4)     Houston Industries            Form 10-K for the year          1-7629      10(s)(4)
             Incorporated Savings Trust    ended December 31, 1995
             (As Amended and Restated
             Effective July 1, 1995)
10(s)(5)     ESOP Trust Agreement          Form 10-K for the year          1-7629      10(j)(2)
             between HI and State Street   ended December 31, 1990
             Bank and Trust Company, as
             ESOP Trustee, dated October
             5, 1990
10(s)(6)     First Amendment to Exhibit    Form 10-Q for the quarter       1-7629      10(b)
             10(s)(5)                      ended March 31, 1995
10(s)(7)     Note Purchase Agreement       Form 10-K for the year          1-7629      10(j)(3)
             between HI and the ESOP       ended December 31, 1990
             Trustee, dated as of
             October 5, 1990
</TABLE>
<PAGE>   214
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
10(s)(8)     Stock Purchase Agreement      Form 10-K for the year          1-7629      10(j)(4)
             between HI and the ESOP       ended December 31, 1991
             Trustee, dated as of
             October 5, 1990
10(t)        Agreement dated June 6,       Form 10-Q for the quarter       1-7629      10(a)
             1994 between HI and Don D.    ended June 30, 1994
             Jordan
10(u)        Agreement dated June 6,       Form 10-Q for the quarter       1-7629      10(b)
             1994 between HI and Don D.    ended June 30, 1994
             Sykora
10(v)        Letter Agreement between HI   Form 10-K for the year          1-7629      10(v)
             and Jack Trotter              ended December 31, 1994
10(w)        Form of Severance             Form 10-K for the year          1-7629      10(w)
             Agreements dated December     ended December 31, 1994
             22, 1994 between HI and
             each of the following
             executive officers: Hugh
             Rice Kelly, R. Steve
             Letbetter, David M.
             McClanahan, Lee W. Hogan
             and William T. Cottle
10(x)        Employment Agreement dated    Form 10-K for the year          1-3187      10(t)
             April 5, 1993 between HL&P    ended December 31, 1994
             and William T. Cottle
10(y)(1)     Stockholder's Agreement       Schedule 13-D dated July 6,    5-19351      2
             dated as of July 6, 1995      1995
             between HI and Time Warner
             Inc.
10(y)(2)     Registration Rights           Schedule 13-D dated July 6,    5-19351      3
             Agreement dated as of July    1995
             6, 1995 between HI and Time
             Warner Inc.
10(y)(3)     Certificate of Voting         Schedule 13-D dated July 6,    5-19351      4
             Powers, Designations,         1995
             Preferences and Relative
             Participating, Optional or
             Other Special rights, and
             Qualifications, Limitations
             or Restrictions Thereof of
             Series D. Convertible
             Preferred Stock of Time
             Warner Inc.
10(z)        Houston Industries            Form 10-K for the year          1-7629      10(z)
             Incorporated Executive        ended December 31, 1995
             Deferred Compensation
             Trust, effective as of
             December 19, 1995
10(aa)       Agreement dated June 14,      Form 10-K for the year          1-7629      10(aa)
             1991 between HI and David     ended December 31, 1995
             M. McClanahan
10(bb)+      Supplemental Pension
             Agreement dated July 17,
             1996 between HI and Lee W.
             Hogan
</TABLE>
<PAGE>   215
 
<TABLE>
<CAPTION>
                                                    REPORT OR           SEC FILE OR
  EXHIBIT                                         REGISTRATION          REGISTRATION     EXHIBIT
  NUMBER             DESCRIPTION                    STATEMENT             NUMBER        REFERENCE
- -----------  ---------------------------   ---------------------------  -----------    -----------
<S>          <C>                           <C>                          <C>            <C>
11(a)        Computation of Earnings Per   Form 10-K for the year          1-7629      11
             Common Share and Common       ended December 31, 1995
             Equivalent Share
11(b)        Computation of Earnings Per   Form 10-Q for the quarter       1-7629      11
             Common Share and Common       ended June 30, 1996
             Equivalent Share
21           Subsidiaries of HI            Form 10-K for the year          1-7629      21
                                           ended December 31, 1995
23(a)+       Consent of Deloitte &
             Touche LLP
23(b)+       Consent of Coopers &
             Lybrand L.L.P.
23(c)+       Consent of T. Milton Honea,
             Robert C. Hanna, O.
             Holcombe Crosswell and
             Joseph M. Grant as Persons
             Named to Become Directors
23(d)+       Consent of Baker & Botts,
             L.L.P. (Included in
             Exhibits 5 and 8)
24+          Powers of Attorney
99(a)+       Form of HI Proxy
99(b)+       Form of NorAm Proxy
99(c)+       Form of Election Form (to
             be filed by amendment)
99(d)+       Consent of CS First Boston
99(e)+       Consent of Merrill Lynch
</TABLE>

<PAGE>   1
                                                                    EXHIBIT 3(C)

                                    FORM OF
                          ARTICLES OF AMENDMENT TO THE
                           ARTICLES OF INCORPORATION
                                       OF
                        HOUSTON LIGHTING & POWER COMPANY


                 Pursuant to and in accordance with the provisions of Article
4.04 of the Texas Business Corporation Act (the "TBCA"), Houston Lighting &
Power Company, a Texas corporation (the "Corporation"), hereby adopts the
following Articles of Amendment to its Articles of Incorporation:

                                  ARTICLE ONE

        The name of the Corporation is Houston Lighting & Power Company.

                                  ARTICLE TWO

                 The following amendments to the articles of incorporation were
adopted by the sole holder of Class A Common Stock of the Corporation on
November __, 1996 in order to create a class of Preference Stock ranking junior
to the Preferred Stock of the Corporation and, pursuant to Article 2.28(D) of
the TBCA, provide that the vote of holders of Common Stock and Preference Stock
required for approval of certain matters shall be the affirmative vote of the
holders of a majority of the outstanding shares of Common Stock and Preference
Stock entitled to vote on such matters.

                                 ARTICLE THREE

                 The first amendment alters or changes the first paragraph of
ARTICLE VI of the Restated Articles of Incorporation and the full text of such
altered paragraph is as follows:

                 "The number of shares of the total authorized capital stock of
the Company is 20,001,100 shares, of which 10,000,000 shares are classified as
Preferred Stock, without par value, 10,000,000 shares are classified as
Preference Stock, without par value, 1,000 shares are classified as Class A
Common Stock, without par value ("Class A Common Stock"), and 100 shares are
classified as Class B Common Stock, without par value ("Class B Common Stock"
and, together with the Class A Common Stock, "Common Stock")."





                                       1
<PAGE>   2
                                  ARTICLE FOUR

                 The second amendment alters or changes "Divisions C -- The
Common Stock" and "Division D -- Provisions Applicable to All Classes of Stock"
and creates a new "Division C -- Preference Stock" of ARTICLE VI of the
Restated Articles of Incorporation and the full text of such altered or crated
divisions are as follows:

                        "DIVISION C -- PREFERENCE STOCK

                 The shares of Preference Stock may be divided into and issued
in one or more series, the relative rights and preferences of which series may
vary in any and all respects.  The Board of Directors of the Company is hereby
vested with the authority to establish series of Preference Stock by fixing and
determining all the relative rights and preferences of the shares of any series
so established, to the extent not provided for in these Articles of
Incorporation or any amendment hereto, and with the authority to increase or
decrease the number of shares within each such series; provided, however, that
the relative rights and preferences of any series of Preference Stock must rank
junior to the relative rights and preferences of the Preferred Stock; and,
provided further, that the Board of Directors may not decrease the number of
shares within a series of Preference Stock below the number of shares within
such series that is then issued.  The authority of the Board of Directors with
respect to such series of Preference Stock shall include, but not be limited
to, determination of the following:

                 (1)  the distinctive designation and number of shares of that
series;

                 (2)  the rate of dividend (or the method of calculation
thereof) payable with respect to shares of that series, the dates, terms and
other conditions upon which such dividends shall be payable, and the relative
rights of priority of such dividends to dividends payable on any other class or
series of capital stock of the Company; provided, however, that the relative
rights of priority of that series must rank junior to the relative rights of
priority of Preferred Stock;

                 (3)  the nature of the dividend payable with respect to shares
of that series as cumulative, noncumulative or partially cumulative, and if
cumulative or partially cumulative, from which date or dates and under what
circumstances;

                 (4)  whether shares of that series shall be subject to
redemption, and, if made subject to redemption, the times, prices, rates,
adjustments and other terms and conditions of such redemption (including the
manner of selecting shares of that series for redemption if fewer than all
shares of such series are to be redeemed);

                 (5)  the rights of the holders of shares of that series in the
event of voluntary or involuntary liquidation, dissolution or winding up of the
Company (which rights may be different if such action is voluntary than if it
is involuntary), including the relative rights of priority in such event as to
the rights of the holders of any other class or series of capital stock of the
Company;





                                       2
<PAGE>   3
provided, however, that the relative rights of priority of that series must
rank junior to the relative rights of priority of Preferred Stock;

                 (6)  the terms, amounts and other conditions of any sinking or
similar purchase or other fund provided for the purchase or redemption of
shares of that series;

                 (7)  whether shares of that series shall be convertible into
or exchangeable for shares of capital stock or other securities of the Company
or of any other corporation or entity, and, if provision be made for conversion
or exchange, the times, prices, rates, adjustments, and other terms and
conditions of such conversion or exchange;

                 (8)  the extent, if any, to which the holders of shares of
that series shall be entitled (in addition to any voting rights provided by
law) to vote as a class or otherwise with respect to the election of directors
or otherwise;

                 (9)  the restrictions and conditions, if any, upon the issue
or reissue of any additional Preference Stock ranking on a parity with or prior
to shares of that series as to dividends or upon liquidation, dissolution or
winding up;

                 (10)  any other repurchase obligations of the Company, subject
to any limitations of applicable law; and

                 (11)  any other designations, preferences, limitations or
relative rights of shares of that series.

Any of the designations, preferences, limitations or relative rights (including
the voting rights) of any series of Preference Stock may be dependent on facts
ascertainable outside these Articles of Incorporation.

                 Shares of any series of Preference Stock shall have no voting
rights except as required by law or as provided in the relative rights and
preferences of such series.

                           DIVISION D -- COMMON STOCK

                 1.  Dividends.  Dividends may be paid on either or both
classes of Common Stock, as the Board of Directors shall from time to time
determine, out of any assets of the Company available for such dividends after
full cumulative dividends on all outstanding shares of capital stock of all
series ranking senior to the Common Stock in respect of dividends and
liquidation rights (referred to in this Division D as "stock ranking senior to
the Common Stock") have been paid, or declared and a sum sufficient for the
payment thereof set apart, for all past quarterly dividend periods, and after
or concurrently with making payment of or provision for dividends on the stock
ranking senior to the Common Stock for the then current quarterly dividend
period.





                                       3
<PAGE>   4
                 2.  Distribution of Assets.  In the event of any liquidation,
dissolution or winding up of the Company, or any reduction or decrease of its
capital stock resulting in a distribution of assets to the holders of its
Common Stock, after there shall have been paid to or set aside for the holders
of the stock ranking senior to the Common Stock the full preferential amounts
to which they are respectively entitled, the holders of the Common Stock shall
be entitled to receive, pro rata, all of the remaining assets of the Company
available for distribution to its stockholders.  The Board of Directors, by
vote of a majority of the members thereof, may distribute in kind to the
holders of the Common Stock such remaining assets of the Company, or may sell,
transfer or otherwise dispose of all or any of the remaining property and
assets of the Company to any other corporation or other purchaser and receive
payment thereof wholly or partly in cash or property, and/or in stock of any
such corporation, and/or in obligations of such corporation or other purchaser,
and may sell all or any part of the consideration received therefor and
distribute the same or the proceeds thereof to the holders of the Common Stock.

                 3.  Voting Rights.  Subject to the voting rights expressly
conferred under prescribed conditions upon the stock ranking senior to the
Common Stock, the holders of the Class A Common Stock shall exclusively possess
full voting power for the election of directors and for all other purposes.
The holders of the Class B Common Stock shall not be entitled to vote except as
may from time to time be mandatorily provided by the laws of the State of
Texas.

          DIVISION E -- PROVISIONS APPLICABLE TO ALL CLASSES OF STOCK

                 1.  Preemptive Rights.  No holder of any stock of the Company
shall be entitled as of right to purchase or subscribe for any part of any
unissued or treasury stock of the Company, or of any additional stock of any
class, to be issued by reason of any increase of the authorized capital stock
of the Company, or to be issued from any unissued or additionally authorized
stock, or of bonds, certificates of indebtedness, debentures or other
securities convertible into stock of the Company, but any such unissued or
treasury stock, or any such additional authorized issue of new stock or
securities convertible into stock, may be issued and disposed of by the Board
of Directors to such persons, firms, corporations or associations, and upon
such terms as the Board of Directors may, in its discretion, determine, without
offering to the stockholders then of record, or any class of stockholders, any
thereof, on the same terms or any terms.

                 2.  Votes Per Share.  Any stockholder of the Company having
the right to vote at any meeting of the stockholders or of any class or series
thereof, shall be entitled to one vote for each share of stock held by him,
provided that no holder of Common Stock of the Company shall be entitled to
cumulate his votes for the election of one or more directors or for any other
purpose."


                                  ARTICLE FIVE

                 The third amendment creates a new ARTICLE X of the Restated
Articles of Incorporation and the full text of such new Article is as follows:





                                       4
<PAGE>   5
                                   "ARTICLE X

                 The vote of stockholders required for approval of (1) any plan
of merger, consolidation, or exchange for which the Texas Business Corporation
Act requires a stockholder vote, (2) any disposition of assets for which the
Texas Business Corporation Act requires a stockholder vote, (3) any dissolution
of the Company for which the Texas Business Corporation Act requires a
stockholder vote, and (4) any amendment of these Articles of Incorporation for
which the Texas Business Corporation Act requires a stockholder vote, shall be
(in lieu of any greater vote required by the Texas Business Corporation Act)
the affirmative vote of the holders of a majority of the outstanding shares
entitled to vote thereon, unless any class or series of shares is entitled to
vote as a class thereon, in which event the vote required shall be the
affirmative vote of the holders of a majority of the outstanding shares within
each class or series of shares entitled to vote thereon as a class and at least
a majority of the outstanding shares otherwise entitled to vote thereon;
provided, however, that the voting rights granted to the holders of Preferred
Stock in Article VI, Division A, Section 5 of these Articles of Incorporation
and the voting rights mandatorily provided to the holders of Preferred Stock by
the laws of the State of Texas are not affected by this ARTICLE X."

                                  ARTICLE SIX

                 The number of shares of the Corporation outstanding at the
time of such adoption was 10,001,100 (10,000,000 shares of Preferred Stock,
1,000 shares of Class A Common Stock and 100 shares of Class B Common Stock);
and the number of shares entitled to vote thereon was 1,000 (Class A Common
Stock).

                 The holder of all of the shares outstanding and entitled to
vote on said amendment has signed a consent in writing pursuant to Article 9.10
of the TBCA adopting said amendment and any written notice required by Article
9.10 of the TBCA has been given.

                 IN WITNESS WHEREOF, the Corporation has caused these Articles
of Amendment to the Articles of Incorporation to be duly executed as of the
____ day of November, 1996.

                                HOUSTON LIGHTING & POWER COMPANY



                                By:
                                   --------------------------------------------
                                   Name:   Hugh Rice Kelly
                                   Title:  Senior Vice President and Secretary





                                       5

<PAGE>   1
                                                                      EXHIBIT 5

                     [LETTERHEAD OF BAKER & BOTTS, L.L.P.]

                                                               October 15, 1996




Houston Lighting & Power Company
Houston Industries Incorporated
Houston Industries Plaza
1111 Louisiana Street
Houston, Texas  77002

Ladies and Gentlemen:

                 Reference is made to the Registration Statement on Form S-4
(Registration No. 333-11329) (the "Registration Statement") filed by Houston
Lighting & Power Company, a Texas corporation ("HL&P"), and Houston Industries
Incorporated, a Texas corporation ("HI"), with the Securities and Exchange
Commission under the Securities Act of 1933, as amended, relating to the
registration of 315,402,570 shares (the "Houston Shares") of common stock,
without par value, of HL&P (including associated rights (the "Houston Rights")
to purchase Series A Preference Stock, without par value, of HL&P, to be
governed by an Amended and Restated Rights Agreement (the "Amended and Restated
Rights Agreement") to be executed immediately prior to the effective time of the
Basic Mergers (as defined in the Joint Proxy Statement/Prospectus which is a
part of the Registration Statement (the "Joint Proxy Statement/Prospectus")) by
and between HL&P and Texas Commerce Bank National Association, as Rights Agent)
issuable in connection with the merger of HI into HL&P and the merger of NorAm
Energy Corp., a Delaware corporation ("NorAm"), into HI Merger, Inc., a Delaware
corporation and wholly owned subsidiary of HI ("Merger Sub"), or if the First
Alternative Merger (as defined in the Joint Proxy Statement/Prospectus) is
effected in lieu of the Basic Mergers, issuable in connection with the First
Alternative Merger, all as more fully described in the Agreement and Plan of
Merger, dated as of August 11, 1996 (the "Merger Agreement"), among HI, HL&P,
Merger Sub and NorAm.

                 The Registration Statement also relates to the registration of
57,167,123 shares (the "HI Shares") of common stock, without par value, of HI
(including associated rights (the "HI Rights") to purchase Series A Preference
Stock, without par value, of HI, governed by a Rights Agreement dated as of
July 11, 1990 (the "Rights Agreement") between HI and Texas Commerce Bank
National Association, as Rights Agent) which will be issued to stockholders of
NorAm rather than Houston Common Stock if the Second Alternative Merger (as
defined in the Joint Proxy Statement/Prospectus) is effected in lieu of the
Basic Mergers pursuant to the Merger Agreement.  In such event, no new shares
of common stock will be issued to the shareholders of HI.
<PAGE>   2
Houston Lighting & Power Company      -2-                      October 15, 1996
Houston Industries Incorporated


                 You have asked us to pass upon for you certain legal matters
with respect to the Houston Shares and the Houston Rights, and the HI Shares
and the HI Rights, as the case may be,  to be issued in connection with the
transactions referred to above.  In our capacity as counsel to HL&P and HI in
connection with such transactions, we have examined the Restated Articles of
Incorporation and Amended and Restated Bylaws of each of HL&P and HI, each as
amended to date, a form of Articles of Amendment to Articles of Incorporation of
HL&P, the Merger Agreement, a form of Amendment to Agreement and Plan of Merger,
the Rights Agreement and a form of the Amended and Restated Rights Agreement and
have examined the originals, or copies certified or otherwise identified, of
corporate records of each of HL&P and HI, including minute books of each of HL&P
and HI as furnished to us by each of HL&P and HI, certificates of public
officials and of representatives of each of HL&P and HI, statutes and other
instruments or documents, as a basis for the opinions hereinafter expressed.  In
giving such opinions, we have relied upon certificates of officers of each of
HL&P and HI with respect to the accuracy of the material factual matters
contained in such certificates.  In making our examination, we have assumed that
all signatures on documents examined by us are genuine, that all documents
submitted to us as originals are authentic and that all documents submitted to
us as certified or photostatic copies conform with the original copies of such
documents. In giving such opinions, we have assumed that prior to the Effective
Time (as defined in the Joint Proxy Statement/Prospectus) (i) the Articles of
Amendment to Articles of Incorporation of HL&P (in a form substantially similar
to the form reviewed by us) will have been duly authorized, adopted, executed 
and filed with the Secretary of State of the State of Texas, (ii) the Amendment
to Agreement and Plan of Merger (in a form substantially similar to the form
reviewed by us) will have been duly authorized, executed and delivered by each
of HI, HL&P, Merger Sub and NorAm and (iii) the Amended and Restated Rights
Agreement (in a form substantially similar to the form reviewed by us) will have
been duly authorized, executed and delivered by both HL&P and the Rights Agent.

                 On the basis of the foregoing, and subject to the assumptions,
limitations and qualifications set forth herein, we are of the opinion that:

                 1.       Each of HL&P and HI is a corporation duly organized
         and validly existing in good standing under the laws of the State of
         Texas.

                 2.       The Houston Shares and the HI Shares have been duly
         authorized and, upon issuance in accordance with the terms of the
         Merger Agreement, will be validly issued, fully paid and
         nonassessable.

                 3.       The issuance of the Houston Rights and the HI Rights
         have been duly authorized by all necessary corporate action on the
         part of each of HL&P and HI, as the case may be, and, upon issuance in
         accordance with the terms of the Amended and Restated Rights Agreement
         or the Rights Agreement, as the case may be, the Houston Rights or the
         HI Rights, as the case may be, will be validly issued.

                 The opinion set forth in paragraph 3 above is limited to the
valid issuance of the Houston Rights and the HI Rights under the Texas Business
Corporation Act.  In this connection, we do not express any opinion herein on
any other aspect of the Houston Rights or the HI Rights, the effect of any
equitable principles or fiduciary considerations relating to the adoption of
the Amended and Restated Rights Agreement or the Rights Agreement or the
issuance of the Houston Rights or the HI Rights, the enforceability of any
particular provisions of the Amended and Restated Rights Agreement or the
Rights Agreement, or the provisions of the Amended and
<PAGE>   3
Houston Lighting & Power Company      -3-                      October 15, 1996
Houston Industries Incorporated


Restated Rights Agreement or the Rights Agreement which discriminate or create
unequal voting power among shareholders.

                   The opinions set forth above are limited in all respects to
matters of Texas law as in effect on the date hereof.  At your request, this
opinion is being furnished to you for filing as Exhibit 5 to the Registration
Statement.  Additionally, we hereby consent to the reference to our Firm under
the caption "Legal Matters" in the Joint Proxy Statement/Prospectus.

                                        Very truly yours,



                                        BAKER & BOTTS, L.L.P.

<PAGE>   1
                                                                       EXHIBIT 8

                     [LETTERHEAD OF BAKER & BOTTS, L.L.P.]

                                                                October __, 1996




Houston Industries Incorporated
Houston Industries Plaza
1111 Louisiana
Houston, Texas 77002-5231

Ladies and Gentlemen:

                 We have acted as your counsel in connection with the
transactions contemplated by the Agreement and Plan of Merger among Houston
Industries Incorporated ("HI"), Houston Lighting & Power Company ("HL&P"), HI
Merger, Inc. ("Merger Sub") and NorAm Energy Corp. ("NorAm"), dated as of
August 11, 1996 (the "Merger Agreement").  Pursuant to the Merger Agreement, HI
will merge with and into HL&P, and NorAm will merge with and into Merger Sub
(the "Basic Mergers").  Alternatively, under certain circumstances, both HI and
NorAm will merge with and into HL&P (the "First Alternative Merger") or NorAm
will merge with and into Merger Sub and HI will not merge with and into HL&P
(the "Second Alternative Merger").  In that connection, we have participated in
the preparation of a registration statement under the Securities Act of 1933, as
amended, of HL&P and of HI on Form S-4 (Registration No. 333-11329) in the form
thereof filed with the Securities and Exchange Commission as amended by
Amendment No. 1 thereto (the "Registration Statement"), including a Joint Proxy
Statement/Prospectus forming Part I of the Registration Statement (the "Proxy
Statement").  Capitalized terms not otherwise defined herein shall have the
meaning specified in the Proxy Statement.

                 We have examined the Merger Agreement, the Proxy Statement,
the representation letters of HI, HL&P and NorAm (the "Representation Letters")
delivered to us for purposes of this opinion, and such other documents and
corporate records as we have deemed necessary or appropriate for purposes of
this opinion.  In addition, we have assumed (i) the Transaction will be
consummated in the manner contemplated in the Proxy Statement and in accordance
with the provisions of the Merger Agreement, (ii) the statements concerning the
Transaction set forth in the Proxy Statement are accurate and complete, and
(iii) the representations made to us in the Representation Letters are accurate
and complete.
<PAGE>   2
Houston Industries Incorporated              -2-               October __, 1996





                 Based on certain assumptions set forth therein, statements of
legal conclusion set forth under the heading "The Transaction -- Certain Federal
Income Tax Consequences" in the Proxy Statement reflect our opinions on the
material tax consequences of the Transaction to the U.S. holders of the HI
Common Stock and NorAm Common Stock based on the Internal Revenue Code of 1986
and applicable regulations thereunder, both as in effect on the date hereof, and
on reported judicial decisions.

                 Our opinion is limited to tax matters specifically covered
hereby.  This delivery of this opinion is not intended to satisfy the condition
to the closing of the Transaction set forth in  Section 6.2(e) of the Merger
Agreement.

                 We hereby consent to the filing of this opinion as Exhibit 8 to
the Registration Statement and to the references to this Firm in the sections
captioned "The Transaction -- Certain Federal Income Tax Consequences" and
"Legal Matters" in the Proxy Statement.  In giving this consent, we do not
thereby admit that we come within the category of a person whose consent is
required under Section 7 of the Securities Act of 1933, as amended, or the rules
and regulations of the Securities and Exchange Commission thereunder.


                               Very truly yours,

<PAGE>   1
                                                                  EXHIBIT 10(aa)

                  [HOUSTON INDUSTRIES INCORPORATED LETTERHEAD]


July 17, 1996



Mr. Lee W. Hogan
11006 Hedwig Green
Houston, Texas  77026

Dear Lee:

                 This letter confirms in writing our agreement regarding the
supplemental pension that Houston Industries Incorporated ("HII") will pay to
(or in respect of) you upon your retirement, disability or death, as further
described below.

                 1.       OBLIGATION WITH RESPECT TO SUPPLEMENTAL PENSION:  In
consideration of your continued employment as an executive officer with HII or
one of its subsidiaries or affiliates (the "Company" herein) until the earliest
of: (a) your normal retirement date, as such date is determined in the sole
discretion of the Board of Directors of HII, (b) the date of any disability
entitling you to a benefit under the terms of the Houston Industries
Incorporated Long Term Disability Plan, as amended from time to time, or (c)
the date of your death, HII will pay to you (or to your spouse or other
beneficiary under the Houston Industries Incorporated Retirement Plan, as
amended from time to time (the "Retirement Plan")) a supplemental pension, out
of the general funds of HII.  The supplemental pension will be calculated in
the same manner and payable under the same terms and conditions as the pension
provided to (or in respect of) you under the Retirement Plan; provided,
however, that (i) the supplemental pension shall be determined as if you had
been an employee of the Company throughout the 15-year period commencing 15
years before your first day of actual employment with the Company as well as
during the period of your actual employment with the Company (all of such
service to be counted for purposes of eligibility, vesting, benefit accrual,
minimum pensions and the fulfillment of service requirements for any form of
pension benefit under the Retirement Plan) and (ii) the supplemental pension
shall be reduced by any benefit actually received by you (or your spouse or
other beneficiary) under (x) the Retirement Plan and (y) any Houston Industries
Incorporated Benefit Restoration Plan.

                 2.       WITHHOLDING OF TAXES:  HII or any successor thereto
may withhold from any benefits payable under this agreement all federal, state,
city or other taxes as may be required pursuant to any applicable law or
governmental regulation or ruling.

                 3.       NO EMPLOYMENT AGREEMENT:  Nothing in this agreement
shall give you any rights (or impose any obligations) with respect to
employment by HII or any affiliate or subsidiary thereof or successor thereto,
nor shall it give such entities any rights (or impose any obligations) with
respect to performance of duties by you.
<PAGE>   2
Mr. Lee W. Hogan                     -2-                           July 17, 1996




                 4.       NO ASSIGNMENT; SUCCESSORS:  Your right to receive any
payments or benefits hereunder is not assignable or transferable, whether by
pledge, by creation of a security interest, voluntarily, involuntarily, by
operation of law or otherwise, other than a transfer by will or by the laws of
descent or distribution, and in the event of any attempted assignment or
transfer contrary to this Paragraph 4, HII shall have no liability to pay any
amount so attempted to be assigned or transferred.  This agreement shall inure
to the benefit of and be enforceable by your personal or legal representatives,
executors, administrators, successors, heirs, distributees, devisees and
legatees.

                  5.      APPLICABLE LAW:  This agreement is entered into
under, and shall be governed for all purposes by, the laws of the State of
Texas.

                 6.       SEVERABILITY:  If a court of competent jurisdiction
determines that any provision of this agreement is invalid or unenforceable,
then the invalidity or unenforceability of that provision shall not affect the
validity or enforceability of any other provision of this agreement and all
other provisions shall remain in full force and effect.

                 If you agree to the terms of this letter agreement, please
sign and date below.

                                        Yours very truly,



                                        /s/ DON D. JORDAN           
                                        ----------------------------
                                        Don D. Jordan

/s/ LEE W. HOGAN         
- -----------------------
Lee W. Hogan

July 29, 1996       
- -----------------------     
Execution Date

<PAGE>   1
 
                         INDEPENDENT AUDITORS' CONSENT
 
We consent to the incorporation by reference in this Amendment No. 1 to the
joint Registration Statement No. 333-11329 of Houston Industries Incorporated
("HII") and Houston Lighting & Power Company ("HL&P") on Form S-4 of our report
dated February 29, 1996 (March 26, 1996 as to Note 4), appearing in the Annual
Report on Form 10-K of HII for the year ended December 31, 1995 and of our
report dated February 29, 1996, appearing in the Annual Report on Form 10-K of
HL&P for the year ended December 31, 1995 and to the reference to us under the
heading "Experts" in the Joint Proxy Statement/Prospectus for HII, HL&P and
NorAm Energy Corp., which is part of this Registration Statement.
 
DELOITTE & TOUCHE LLP
 
Houston, Texas
   
October 14, 1996
    
 
                                        2

<PAGE>   1
 
                       CONSENT OF INDEPENDENT ACCOUNTANTS
 
     We consent to the incorporation by reference in Houston Lighting & Power
Company and Houston Industries Incorporated registration statement on Form S-4
of our report dated March 25, 1996, on our audits of the consolidated financial
statements of NorAm Energy Corp. and Subsidiaries as of December 31, 1995 and
1994, and for the years ended December 31, 1995, 1994 and 1993, which report is
incorporated by reference in NorAm Energy Corp. and Subsidiaries' Annual Report
on Form 10-K. We also consent to the reference to our firm under the caption
"Experts."
 
                                          COOPERS & LYBRAND L.L.P.
 
Houston, Texas
October 15, 1996

<PAGE>   1

                                                                   EXHIBIT 23(C)


                  CONSENT OF PERSON NAMED TO BECOME A DIRECTOR



         Pursuant to Rule 438 under the Securities Act of 1933, as amended, the
undersigned hereby consents to being named in the Joint Proxy
Statement/Prospectus forming a part of this Registration Statement on Form S-4
(Registration No. 333-11329) as a person to become a director of the surviving
corporation of the merger of Houston Industries Incorporated with and into
Houston Lighting & Power Company upon consummation of the merger.

         Dated: October 14, 1996

                                        /s/ T. Milton Honea 
                                        ----------------------
                                        T. Milton Honea





<PAGE>   2
                  CONSENT OF PERSON NAMED TO BECOME A DIRECTOR



         Pursuant to Rule 438 under the Securities Act of 1933, as amended, the
undersigned hereby consents to being named in the Joint Proxy
Statement/Prospectus forming a part of this Registration Statement on Form S-4
(Registration No. 333-11329) as a person to become a director of the surviving
corporation of the merger of Houston Industries Incorporated with and into
Houston Lighting & Power Company upon consummation of the merger.

         Dated: October 14, 1996

                                        /s/ Robert C. Hanna 
                                        ----------------------
                                        Robert C. Hanna





<PAGE>   3
                  CONSENT OF PERSON NAMED TO BECOME A DIRECTOR



         Pursuant to Rule 438 under the Securities Act of 1933, as amended, the
undersigned hereby consents to being named in the Joint Proxy
Statement/Prospectus forming a part of this Registration Statement on Form S-4
(Registration No. 333-11329) as a person to become a director of the surviving
corporation of the merger of Houston Industries Incorporated with and into
Houston Lighting & Power Company upon consummation of the merger.

         Dated: October 14, 1996

                                        /s/ O. Holcombe Crosswell 
                                        ----------------------------
                                        O. Holcombe Crosswell





<PAGE>   4
                  CONSENT OF PERSON NAMED TO BECOME A DIRECTOR



         Pursuant to Rule 438 under the Securities Act of 1933, as amended, the
undersigned hereby consents to being named in the Joint Proxy
Statement/Prospectus forming a part of this Registration Statement on Form S-4
(Registration No. 333-11329) as a person to become a director of the surviving
corporation of the merger of Houston Industries Incorporated with and into
Houston Lighting & Power Company upon consummation of the merger.

         Dated: October 14, 1996

                                        /s/ Joseph M. Grant 
                                        ----------------------
                                        Joseph M. Grant






<PAGE>   1
                                                              EXHIBIT 24




                        HOUSTON LIGHTING & POWER COMPANY

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON LIGHTING & POWER COMPANY, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre-effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
Houston Industries Incorporated, HI Merger, Inc. and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys-in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in-fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 29th day of August, 1996.


                                                 /s/ W.T. Cottle           
                                                 -------------------
                                                 W.T. Cottle
<PAGE>   2
                        HOUSTON LIGHTING & POWER COMPANY

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON LIGHTING & POWER COMPANY, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre-effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
Houston Industries Incorporated, HI Merger, Inc. and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys-in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in-fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 10th day of October, 1996.


                                        /s/ Charles R. Crisp 
                                        -----------------------
                                        Charles R. Crisp





<PAGE>   3
                        HOUSTON LIGHTING & POWER COMPANY

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON LIGHTING & POWER COMPANY, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre-effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
Houston Industries Incorporated, HI Merger, Inc. and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys-in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in-fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 29th day of August, 1996.


                                        /s/ Jack D. Greenwade 
                                        -------------------------
                                        Jack D. Greenwade





<PAGE>   4



                        HOUSTON LIGHTING & POWER COMPANY

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON LIGHTING & POWER COMPANY, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre-effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
Houston Industries Incorporated, HI Merger, Inc. and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys-in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in-fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 30th day of August, 1996.


                                        /s/ Lee W. Hogan           
                                        -------------------------
                                        Lee W. Hogan
<PAGE>   5
                        HOUSTON LIGHTING & POWER COMPANY

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON LIGHTING & POWER COMPANY, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre-effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
Houston Industries Incorporated, HI Merger, Inc. and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys-in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in-fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 30th day of August, 1996.


                                        /s/ Don D. Jordan 
                                        -------------------------
                                        Don D. Jordan
<PAGE>   6
                        HOUSTON LIGHTING & POWER COMPANY

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON LIGHTING & POWER COMPANY, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre-effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
Houston Industries Incorporated, HI Merger, Inc. and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys-in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in-fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 29th day of August, 1996.


                                        /s/ Hugh Rice Kelly 
                                        -------------------------
                                        Hugh Rice Kelly
<PAGE>   7
                        HOUSTON LIGHTING & POWER COMPANY

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON LIGHTING & POWER COMPANY, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre-effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
Houston Industries Incorporated, HI Merger, Inc. and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys-in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in-fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 30th day of August, 1996.


                                        /s/ R. Steve Letbetter 
                                        -------------------------
                                        R. Steve Letbetter
<PAGE>   8
                        HOUSTON LIGHTING & POWER COMPANY

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON LIGHTING & POWER COMPANY, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre-effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
Houston Industries Incorporated, HI Merger, Inc. and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys-in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in-fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 29th day of August, 1996.


                                        /s/ David M. McClanahan 
                                        -------------------------
                                        David M. McClanahan
<PAGE>   9
                        HOUSTON LIGHTING & POWER COMPANY

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON LIGHTING & POWER COMPANY, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre-effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
Houston Industries Incorporated, HI Merger, Inc. and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys-in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in-fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 30th day of August, 1996.


                                        /s/ Stephen W. Naeve 
                                        -------------------------
                                        Stephen W. Naeve
<PAGE>   10
                        HOUSTON LIGHTING & POWER COMPANY

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON LIGHTING & POWER COMPANY, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre-effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
Houston Industries Incorporated, HI Merger, Inc. and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys-in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in-fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 30th day of August, 1996.


                                        /s/ Stephen C. Schaeffer 
                                        -------------------------
                                        Stephen C. Schaeffer
<PAGE>   11
                        HOUSTON LIGHTING & POWER COMPANY

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON LIGHTING & POWER COMPANY, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre-effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
Houston Industries Incorporated, HI Merger, Inc. and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys-in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in-fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 29th day of August, 1996.


                                        /s/ Robert L. Waldrop 
                                        -------------------------
                                        Robert L. Waldrop
<PAGE>   12





                        HOUSTON INDUSTRIES INCORPORATED

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON INDUSTRIES INCORPORATED, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre- effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
the Company's subsidiaries, Houston Lighting & Power Company and HI Merger,
Inc., and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys- in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in- fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 2nd day of September, 1996.


                                                    /s/ John T. Cater     
                                                    ----------------------------
                                                    John T. Cater
<PAGE>   13
                        HOUSTON INDUSTRIES INCORPORATED

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON INDUSTRIES INCORPORATED, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre- effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
the Company's subsidiaries, Houston Lighting & Power Company and HI Merger,
Inc., and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys- in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in- fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 30th day of August, 1996.


                                                    /s/ Don D. Jordan     
                                                    ----------------------------
                                                    Don D. Jordan





<PAGE>   14
                        HOUSTON INDUSTRIES INCORPORATED

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON INDUSTRIES INCORPORATED, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre- effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
the Company's subsidiaries, Houston Lighting & Power Company and HI Merger,
Inc., and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys- in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in- fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 30th day of August, 1996.


                                                    /s/ R. Steve Letbetter     
                                                    ----------------------------
                                                    R. Steve Letbetter





<PAGE>   15
                        HOUSTON INDUSTRIES INCORPORATED

                               Power of Attorney

                                 (Common Stock)


                 WHEREAS, HOUSTON INDUSTRIES INCORPORATED, a Texas corporation
(the "Company"), intends to file with the Securities and Exchange Commission
(the "Commission") under the Securities Act of 1933, as amended (the "Act"),
one or more Registration Statements, each on Form S-4 (the "Registration
Statement"), including in each instance any joint proxy statement/prospectus
included therein (a "Joint Proxy Statement/Prospectus"), with such amendments
(including pre- effective and post-effective amendments) to each such
Registration Statement and any supplement or supplements to the Joint Proxy
Statement/Prospectus as may be necessary or appropriate, together with any and
all exhibits and other documents related to each such Registration Statement or
Joint Proxy Statement/Prospectus, in connection with the registration of shares
of common stock, without par value, of the Company to be issued pursuant to the
Agreement and Plan of Merger, dated August 11, 1996, by and among the Company,
the Company's subsidiaries, Houston Lighting & Power Company and HI Merger,
Inc., and NorAm Energy Corp.

                 NOW, THEREFORE, the undersigned in his capacity as a director
or officer or both, as the case may be, of the Company, does hereby appoint Don
D. Jordan, Hugh Rice Kelly and Stephen W. Naeve, and each of them severally,
his true and lawful attorney or attorneys-in-fact, with power to act with or
without the others and with full power of substitution and resubstitution, to
execute in his name, place and stead, in his capacity as a director or officer
or both, as the case may be, of the Company, each such Registration Statement
referred to above, and any and all amendments (including pre-effective and
post-effective amendments) thereto, and any supplements to the Joint Proxy
Statement/Prospectus as said attorneys-in-fact or any of them shall deem
necessary or appropriate, together with all instruments necessary or incidental
in connection therewith, to file the same or cause the same to be filed with
the Commission, and to appear before the Commission in connection with any
matter relating thereto.  Each of said attorneys- in-fact shall have full power
and authority to do and perform in the name and on behalf of the undersigned,
in any and all capacities, every act whatsoever necessary or desirable to be
done, as fully and for all intents and purposes as the undersigned might or
could do in person, the undersigned hereby ratifying and approving the acts
that said attorneys-in- fact and each of them may lawfully do or cause to be
done by virtue hereof.

                 IN WITNESS WHEREOF, the undersigned has executed this
instrument this 30th day of August, 1996.


                                                    
                                                    /s/ Alexander F. Schilt     
                                                    ----------------------------
                                                    Alexander F. Schilt, Ph.D.






<PAGE>   1
 
                                                                   EXHIBIT 99(A)
 
- --------------------------------------------------------------------------------
 
                        HOUSTON INDUSTRIES INCORPORATED
              PROXY SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
          SPECIAL MEETING OF SHAREHOLDERS TO BE HELD DECEMBER 11, 1996
 
            The undersigned hereby appoints D.D. Jordan, R. Steve Letbetter
        and Lee W. Hogan, jointly and severally, proxies, with full power
        of substitution and with discretionary authority, to represent and
        to vote, as designated below, all shares of Common Stock which the
        undersigned is entitled to vote at the special meeting of
        shareholders of Houston Industries Incorporated, or any adjournment
        or postponement thereof.
  
            This proxy when properly executed will be voted in the manner
        directed herein by the undersigned shareholder.
        If no direction is made, this proxy will be voted FOR Proposal 1.
 
        1.  PROPOSAL TO APPROVE AND ADOPT THE AGREEMENT AND PLAN OF MERGER,
            dated as of August 11, 1996, by and among Houston Industries
            Incorporated, its subsidiaries Houston Lighting & Power Company
            and HI Merger, Inc., and NorAm Energy Corp. and the
            transactions contemplated thereby, including the election of T.
            Milton Honea, Robert C. Hanna, O. Holcombe Crosswell and Joseph
            M. Grant as directors effective as of the effective time of the
            merger of Houston Industries Incorporated into Houston Lighting
            & Power Company.

            FOR / /                  AGAINST / /                ABSTAIN / /
   
        2.  In their discretion, the proxies are authorized to vote upon
            any other business as may properly come before the special
            meeting.
 
- --------------------------------------------------------------------------------





<PAGE>   2
 
- --------------------------------------------------------------------------------
 
        IF YOU WISH TO VOTE IN ACCORDANCE WITH THE RECOMMENDATIONS OF THE
        BOARD OF DIRECTORS, YOU MAY JUST SIGN AND DATE BELOW AND MAIL IN
        THE POSTAGE-PAID ENVELOPE PROVIDED. SPECIFIC CHOICES MAY BE MADE ON
        THE REVERSE SIDE. IN THE ABSENCE OF INSTRUCTIONS TO THE CONTRARY,
        THE SHARES REPRESENTED WILL BE VOTED IN ACCORDANCE WITH THE BOARD'S
        RECOMMENDATION TO APPROVE THE AGREEMENT AND PLAN OF MERGER.
 
                                                   Dated: ----------------, 1996

                                                   Signature: -----------------

    P                                              Signature:------------------
    R
    O                                              (Note: Please sign exactly
    X                                              as name(s) appears hereon.
    Y                                              Joint owners should each
                                                   sign. When signing as
                                                   attorney, executor,
                                                   administrator, trustee or
                                                   guardian, please give full
                                                   title.)

                                                   DO YOU PLAN TO ATTEND
   ----------------------------------------------- THE SPECIAL MEETING? --------
     PLEASE MARK, SIGN, DATE AND RETURNTHIS PROXY
      CARD PROMPTLY USING THE ENCLOSED ENVELOPE
   -----------------------------------------------     
 
- --------------------------------------------------------------------------------
 
   
   
   
   
   

<PAGE>   1
 
                                                                   EXHIBIT 99(B)
- --------------------------------------------------------------------------------
 
                               NORAM ENERGY CORP.
         THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS
 
   
            The undersigned hereby appoints T. Milton Honea, Michael B.
        Bracy and Hubert Gentry, Jr., and each of them, proxies with power
        of substitution, and hereby authorizes them to represent and to
        vote, as designated below, all of the shares of stock of NorAm
        Energy Corp. held of record by the undersigned on October 18, 1996,
        at the Special Meeting of Stockholders to be held in Houston,
        Texas, on December 11, 1996, and at all adjournments thereof, with
        all powers the undersigned would possess if personally present. In
        their discretion, the proxies are and authorized to vote upon such
        other business that may properly come before the meeting.
    
            APPROVAL OF THE AGREEMENT AND PLAN OF MERGER, dated as of
            August 11, 1996, by and among Houston Industries
            Incorporated, Houston Lighting & Power Company, HI Merger,
            Inc. and NorAm Energy Corp. and the transactions
            contemplated thereby.
 
                 FOR / /          AGAINST / /          ABSTAIN / /
 
                            (continued on reverse side)
- --------------------------------------------------------------------------------
 
    P
    R
    O
    X
    Y
<PAGE>   2
 
- --------------------------------------------------------------------------------
 
        THIS PROXY WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER
        DIRECTED HEREIN BY THE UNDERSIGNED STOCKHOLDER. IF NO DIRECTION IS
        MADE THIS PROXY WILL BE VOTED FOR ADOPTION OF THE AGREEMENT AND
        PLAN OF MERGER.
                                                    Please sign exactly as name
                                                    appears below. When shares
                                                    are held by Joint Tenants,
                                                    both should sign, and when
    P                                               signing as attorney, as
    R                                               executor, as administrator,
    O                                               trustee or guardian, please
    X                                               give full title as such. If
    Y                                               held by a corporation,
                                                    please sign in the full
                                                    corporate name by the
                                                    President or other
                                                    authorized officer. If held
                                                    by a partnership, please
                                                    sign in the partnership name
                                                    by an authorized person.

                                                    ----------------------------
                                                    Signature

                                                    ----------------------------
                                                    Signature if behalf jointly

   -----------------------------------------------  Dated:----------------, 1996
    PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY         
      CARD PROMPTLY USING THE ENCLOSED ENVELOPE
   -----------------------------------------------
 
- --------------------------------------------------------------------------------






<PAGE>   1





                                                                   EXHIBIT 99(D)


                                    CONSENT
                                       OF
                          CS FIRST BOSTON CORPORATION



Board of Directors
Houston Industries Incorporated
1111 Louisiana Street
Houston, Texas  77002

Members of the Board:

                 We hereby consent to (i) the inclusion of our opinion letter,
dated August 11, 1996, to the Board of Directors of Houston Industries
Incorporated ("HI") as Appendix B to the Joint Proxy Statement/Prospectus of
HI, Houston Lighting & Power Company ("HL&P") and NorAm Energy Corp. ("NorAm")
relating to the proposed merger transaction involving HI, HL&P and NorAm, and
(ii) references made to our firm and such opinion in such Joint Proxy
Statement/Prospectus under the captions entitled "SUMMARY - Opinions of
Financial Advisors," "THE TRANSACTION - Background of the Transaction" and "THE
TRANSACTION - Opinion of HI's Financial Advisor."  In giving such consent, we
do not admit that we come within the category of persons whose consent is
required under, and we do not admit that we are "experts" for purposes of, the
Securities Act of 1933, as amended, and the rules and regulations promulgated
thereunder.

                                        CS FIRST BOSTON CORPORATION



                                        By: /s/ CS FIRST BOSTON CORPORATION  
                                            ------------------------------------

October 14, 1996

<PAGE>   1
                                                                   EXHIBIT 99(E)

         CONSENT OF MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED


         We hereby consent to the references to our firm under the captions
"Summary--Opinions of Financial Advisors," "The Transaction--Background of
Transaction," "The Merger--NorAm's Reasons for the Transaction," and "The
Merger--Opinion of NorAm's Financial Advisor" in, and to the inclusion of a
copy of our opinion letter as Appendix C to, the Joint Proxy
Statement/Prospectus comprising part of the Registration Statement filed by
Houston Industries Incorporated and Houston Lighting & Power Company on Form
S-4 under the Securities Act of 1933, as amended.  By giving this consent, we
do not admit that we come within the category of persons whose consent is
required under Section 7 of the Securities Act of 1933, as amended, or the
rules and regulations of the Securities and Exchange Commission issued
thereunder, nor do we admit that we are experts with respect to any part of
such Registration Statement within the meaning of the term "experts" as used in
the Securities Act of 1933, as amended, or the rules and regulations of the
Securities and Exchange Commission issued thereunder.

                                        MERRILL LYNCH, PIERCE, FENNER & SMITH
                                                  INCORPORATED



                                        By:   /s/  CHARLES M. DAVIS, JR.
                                           -------------------------------------
                                        Name:    Charles M. Davis, Jr.
                                        Title:   Director

October 14, 1996


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