COGENERATION CORP OF AMERICA
PRER14A, 1998-10-23
COGENERATION SERVICES & SMALL POWER PRODUCERS
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                                  SCHEDULE 14A
                                 (Rule 14a-101)
                     INFORMATION REQUIRED IN PROXY STATEMENT
                            SCHEDULE 14A INFORMATION
           Proxy Statement Pursuant to Section 14(a) of the Securities
                     Exchange Act of 1934 (Amendment No. 2)

Filed by the Registrant  |X|

Filed by a Party other than the Registrant  |_|

Check the appropriate box:

|X|   Preliminary Proxy Statement

|_|   Definitive Proxy Statement

|_|   Definitive Additional Materials

|X|   Soliciting Material Pursuant to Rule 14a-11(c) or Rule 14a-12

|_|   Confidential, For Use of the Commission Only (as permitted by Rule
      14a-6(e) (2))

                       Cogeneration Corporation of America
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified in Its Charter)


- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment of Filing Fee (Check the appropriate box):

|X|   No fee required.

|_|   Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

      (1) Title of each class of securities to which transaction applies:

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      (2) Aggregate number of securities to which transaction applies:

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      (3) Per unit price or other underlying value of transaction computed
pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee
is calculated and state how it was determined):

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      (4) Proposed maximum aggregate value of transaction:

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      (5) Total fee paid:

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|_|   Fee paid previously with preliminary materials:

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      |_| Check box if any part of the fee is offset as provided by Exchange Act
Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid
previously. Identify the previous filing by registration statement number, or
the form or schedule and the date of its filing.

      (1) Amount previously paid:

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      (2) Form, Schedule or Registration Statement no.:

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<PAGE>

                               Preliminary Copies

                       COGENERATION CORPORATION OF AMERICA
                         One Carlson Parkway, Suite 240
                        Minneapolis, Minnesota 55447-4454

                           SOLICITATION IN OPPOSITION
                                       TO
                                 PROXY STATEMENT
                                       AND
                                CONSENT STATEMENT
                                       OF
                                NRG ENERGY, INC.

                               -------------------

                         SPECIAL MEETING OF STOCKHOLDERS
                         TO BE HELD ON NOVEMBER 12, 1998

                               -------------------

                               GENERAL INFORMATION

      Cogeneration Corporation of America, a Delaware corporation (the
"Company"), is distributing this opposition solicitation to its stockholders in
connection with a Special Meeting of Stockholders of the Company to be held at
8:00 a.m., Local Time, on Thursday, November 12, 1998, at the Hyatt Regency
Hotel, 1300 Nicollet Mall, Minneapolis, Minnesota 55403, which was called upon
the demand of NRG Energy, Inc. ("NRG"), a wholly-owned subsidiary of Northern
States Power Company ("NSP"). The purpose of the Meeting is to consider and act
upon a proposal made by NRG to remove Robert T. Sherman, Jr., the Company's
Chief Executive Officer, from his position as a director of the Company.

   
      This opposition solicitation and the enclosed WHITE proxy card are first
being mailed to stockholders on or about October [26], 1998.

      The Company, its three independent directors and its chief executive
officer (who is also a director of the Company), are Participants in this
opposition solicitation. The Company's three independent directors, Lawrence I.
Littman, Spyros S. Skouras, Jr. and Charles J. Thayer (collectively, the
"Independent Directors") comprise the Company's Independent Directors Committee.
The Company believes that David H. Peterson, Julie A. Jorgensen, Craig A.
Mataczynski and Ronald J. Will, directors of the Company who are employees of
NRG, support the NRG Proposal and, therefore, are not Participants in this
solicitation. While the Company's chief executive officer and its Independent
Directors Committee approved the Company participating in this opposition
solicitation, the full Board of Directors of the Company did not vote on the
matter.
    

      The Participants believe that it is not in the interest of the Company or
the Company's public stockholders who own a majority of the Company's stock and
who are not affiliated with NSP that Robert Sherman be removed as a director of
the Company which would result in NSP's
<PAGE>

NRG unit taking control of the Board of Directors and eventually the day to day
operations of the Company. The Participants also believe that they have an
obligation to correct certain misstatements contained in NRG's Proxy Statement
and Consent Statement. The basis for such belief, and a discussion of such
misstatements, appear below.

   
      At the Meeting, a quorum will consist of 60% of the votes entitled to be
cast by the holders of all shares of Common Stock that are outstanding and
entitled to vote. Approval of the NRG Proposal requires the affirmative vote of
only a majority of the shares of Common Stock present or represented by proxy at
the Meeting and entitled to vote. Because NRG owns or controls approximately
47.4% of the outstanding shares, these shares would be a majority of the shares
at the Meeting, even if every other share which was voted, was voted against the
NRG Proposal (except in the unlikely situation where more than 94.8% of the
outstanding shares were present or represented by proxies at the Meeting).
However, NRG does require the proxies, either voting in favor of or against or
abstaining on the NRG Proposal, of 12.6% of the outstanding shares to gain a
quorum to hold a valid Meeting. As a result, it will be more difficult for NRG
to obtain a quorum for the Meeting if a significant number of stockholders
refuse or fail to participate in the Meeting than it will be to obtain
sufficient votes to remove Robert Sherman as a director of the Company.

      Accordingly, the purpose of this opposition solicitation is to encourage
you to execute and return the enclosed WHITE proxy card which is solicited by
the Company in order to have you (i) revoke all prior proxies and consents given
by you to NRG, (ii) vote against the NRG Proposal and (iii) grant the right to
the persons appointed on the enclosed WHITE proxy card to boycott the Meeting if
they determine that doing so will be the most effective way to prevent the NRG
Proposal from being passed (i.e., by preventing the presence of a quorum at the
Meeting).

      As a procedural matter, the persons appointed as proxies on the enclosed
WHITE proxy card will rely on a designated person who is eligible to attend the
Meeting and who does attend the Meeting to inform them, at the time of the
Meeting, of whether or not it appears that there are a sufficient number of
shares represented at the Meeting (excluding the shares for which the persons
appointed on the enclosed WHITE proxy card have authority) to constitute a
quorum. The WHITE proxy card will be used to boycott the Meeting if, at such
time, it appears to the persons appointed that NRG does not have sufficient
proxies to obtain a quorum for the Meeting. That decision cannot be made until
the time of the Meeting.
    

       

      At your option, you may revoke a proxy delivered pursuant to this
solicitation at any time before it is exercised. A proxy may be revoked by
executing and delivering a later dated proxy, by delivering written notice of
the revocation of the proxy to the Secretary of the Company prior to the
Meeting, or by attending and voting at the Meeting. Attendance at the Meeting,
in and of itself, will not constitute a revocation of a proxy.

   
      If you duly execute and return the enclosed WHITE proxy card prior to the
Meeting, and do not thereafter revoke it, and no decision is made to boycott the
Meeting, your shares will be voted. If no directions are specified, your shares
will be counted towards a quorum and voted AGAINST the removal of Robert Sherman
from his position as a member of the Company's Board of Directors and in
accordance with the discretion of the named proxies, on other matters that may
properly be brought before the Meeting, except that you will have granted the
right to
    


                                       2
<PAGE>

   
the persons appointed on the WHITE proxy card to boycott the Meeting if they
determine that doing so will be the most effective way to prevent the NRG
Proposal from being passed (i.e., by preventing the presence of a quorum at the
Meeting).
    

      If your shares are held in the name of a bank, broker, or other nominee,
you are urged to contact the person responsible for your account and direct him
or her to execute a WHITE proxy card on your behalf.

      The close of business on October 8, 1998 has been fixed as the Record Date
for the determination of stockholders of the Company entitled to notice of and
to vote at the Meeting. On that date, the Company had outstanding 6,871,069
shares of its Common Stock. Each share of Common Stock entitles the holder to
one vote.

      At the Meeting, abstentions will be treated as present for purposes of
determining a quorum, while shares held by a broker that the broker fails to
vote ("broker non-votes") will not be treated as present for quorum purposes.
Abstentions will have the effect of votes against the approval of the NRG
Proposal. However, under applicable Delaware law, a broker non-vote will have no
effect on the outcome of the NRG Proposal.

      Certain information required to be disclosed in this opposition
solicitation pursuant to Regulation 14A promulgated under the Securities
Exchange Act of 1934 is included on Schedule A which is attached to this
opposition solicitation.

                      REASONS FOR OPPOSING THE NRG PROPOSAL

      The Company and the Independent Directors strongly believe that it is not
in the Company's interest or the interest of the Company's public stockholders
who own a majority of the Company's stock and who are not affiliated with NSP
that Robert Sherman be removed as a director of the Company. Such removal would
result in NSP's NRG unit taking control of the Board of Directors of the Company
and, eventually, the day to day operations of the Company.

      NRG employees presently occupy four of the eight seats on the Company's
Board of Directors. The Chairman of NRG, David Peterson, is also the Chairman of
the Company's Board of Directors. Three of the remaining seats are held, in
accordance with the Company's bylaws, by the Independent Directors. The fourth
seat is held by the Company's President and Chief Executive Officer, Robert
Sherman.

      NRG has indicated that if it is successful in removing Mr. Sherman from
the Company's Board of Directors, it plans to terminate immediately his
employment with the Company. NRG proposes to replace Mr. Sherman in both
capacities - as a director and as chief executive officer - with yet another
NSP-affiliated employee, which would give NSP control of five of the eight seats
on the Board, as well as control of the daily operations of the Company as
carried out by its chief executive officer.

      The Company and the Independent Directors believe it to be poor corporate
governance willingly to permit a 45% stockholder to both control its Board of
Directors and its chief


                                       3
<PAGE>

executive officer. Admittedly, NRG nominees comprised a majority of the
Company's Board of Directors pursuant to the plan of reorganization approved by
the Bankruptcy Court when the Company emerged from bankruptcy. Indeed, some of
the Participants in this solicitation were involved in the negotiation and
implementation of that governance structure. However, since that structure
changed with the election of Mr. Sherman as Chief Executive Officer and a
director, it has become clear to the Participants in this solicitation in light
of the conduct of NRG's board appointees (with NSP's acquiescence), that a
governance structure permitting NRG to control both the Board of Directors and
the chief executive officer would make the necessary accountability of
management to the full board practically meaningless and leaves practical
control of all aspects of the Company's governance and operations in the hands
of one party. A majority of the Board of Directors can not only change the
Company's management, but also amend many of the Company's bylaws, at will. This
change has become increasingly significant because, in the view of the
Participants, the NRG nominees have been willing to permit NSP's NRG unit to
take advantage of the Company and its public stockholders.

      NRG has publicly announced that it has met its minimum obligation to the
Company under the Co-Investment Agreement entered into on April 30, 1996 (which
was intended to be the Company's primary vehicle for growth for seven years).
Because NRG and the Company are competitors in the same market for cogeneration
energy projects, there is an inherent conflict of interests between NSP's NRG
unit and the Company's public stockholders - one's advantage is the other's
disadvantage. The Independent Directors Committee is very concerned that NRG
will not provide additional projects to the Company to foster future growth.
Furthermore, if NSP gains control of the Board of Directors of the Company, it
will be in a position to acquire projects at the expense of the Company without
the check of a meaningful independent voice - neither in management nor on the
Board. The Independent Directors do not have the same ability or time to monitor
the day to day conduct of the Company, NSP or NSP's NRG unit as the Company's
independent Chief Executive Officer. In addition, NSP would be in a position,
and would have an incentive, to compel the Company to take actions that could be
in the interests of NSP and its NRG unit and not the Company and its public
stockholders.

      Allowing NSP to both control the Company's Board of Directors and its
daily operations (through its "control" of the chief executive officer) has the
potential of causing severe and irreparable harm to the Company and its public
stockholders who are unaffiliated with NSP. The Company believes that in the
past NSP has consistently demonstrated a desire to take advantage of the Company
and its public stockholders by unreasonably using its influence to the
disadvantage of the public stockholders. Of course, all of the Company's
directors, whether NRG affiliates or not, have a fiduciary duty to the Company
and to all of its stockholders

      With the current balance of power, management of the Company, under the
independent leadership of Robert Sherman, has worked together with the
Independent Directors Committee to monitor NSP's and NRG's actions and to
protect the interests of the Company and its public stockholders. Such
protection by independent management would, to a large degree, disappear if the
NRG Proposal is passed.


                                       4
<PAGE>

o     NRG has consistently offered the Company projects for purchase under the
      Co-Investment Agreement at prices significantly in excess of fair market
      values.

o     NSP's NRG unit initially offered to sell the Company its interest in a
      project located in Morris, Illinois (the "Morris Project") for
      approximately $8,000,000. After a thorough analysis of the project and its
      potential benefits to the Company, Mr. Sherman and the Company's
      management determined that such a price was excessively high and
      recommended that the Company not enter into an agreement on such terms.
      With the support of the Independent Directors Committee, the Company made
      a counter-offer for approximately $5,000,000 which was eventually
      accepted. During negotiations in which NRG attempted to finance the sale
      of the project to the Company on onerous terms, the Company learned that,
      in addition to the $5,000,000 that it agreed to pay NRG, NRG caused to be
      paid to itself a $4,000,000 development fee from the Morris Project which
      would have given NRG a total of approximately $9,000,000 for the
      transaction. Management was able to negotiate to have NRG credit the
      $4,000,000 development fee taken from the Morris Project against the
      $5,000,000 purchase price.

o     Pursuant to the Co-Investment Agreement, NRG initially offered to sell its
      interest in the Mid-Continent Power Company ("MCPC") to the Company for
      approximately $36,000,000 ($21,000,000 more than NRG initially paid for
      its interest). This offer was not recommended by management and was
      rejected by the Independent Directors Committee - the price was determined
      to be excessive and "above market". NRG then offered the project to a
      third-party for approximately $25,000,000 ignoring the Company's right of
      first refusal contained in the Co-Investment Agreement.

      After failed negotiations with NRG to resolve these issues, the
      Independent Directors Committee was compelled to seek costly arbitration
      to prevent the loss to the Company's public stockholders of the
      substantial value represented by the MCPC project. Following the unanimous
      decision of the arbitration panel to force NRG to offer MCPC to the
      Company for $25,000,000 (saving the Company and its public stockholders
      more than $10,000,000), NRG commenced its proxy solicitation to oust Mr.
      Sherman.

      The Company believes that the real underlying reason for NRG's proxy
      solicitation is retaliation for NRG's loss in the arbitration. This belief
      comes from the fact that the NRG-affiliated directors voted to re-elect
      Mr. Sherman as Chief Executive Officer on August 10, 1998 and the Company
      believes that the only material event which occurred at this time was the
      MCPC arbitration. The formal decision to buy MCPC (over the continuing
      opposition of NRG) was made at the beginning of September, less than two
      weeks before NRG filed its proxy materials.

o     NRG has indicated that it intends to seek reimbursement from the Company
      in connection with its proxy and consent solicitation and in connection
      with litigation's that may arise out of its proxy and consent solicitation
      if the NRG Proposal is approved, without submitting the request for such
      reimbursements to a vote of the Company's stockholders.


                                       5
<PAGE>

   
      Pursuant to the Company's By-laws, the Independent Directors are required
to approve any material transactions between the Company on one hand and NSP and
NRG on the other hand. In addition, the Independent Directors Committee has the
sole authority and responsibility to make all decisions on behalf of the Company
under the two agreements between the Company and NRG, the Co-Investment
Agreement and the Management Services Agreement. While the Company's Chief
Executive Officer is not a member of the Independent Directors Committee, Mr.
Sherman has worked closely with the Independent Directors Committee to advise it
with respect to NSP's and NRG's actions, especially those actions requiring Mr.
Sherman's particular expertise in the energy businesses. The Independent
Directors do not believe that they have the time or the expertise to monitor on
a day to day basis the Company's interaction with NSP or NRG without the benefit
of an independent Company executive, one who is not responsible to NRG. It is
for this reason that the Board of Directors initiated a search for an
independent Chief Executive Officer when the vacancy in the position occurred.
Although the authority of the Independent Directors Committee would not be
effected by the removal of Mr. Sherman as a director (and thereafter as Chief
Executive Officer of the Company), the Independent Directors Committee believes
that its effectiveness in protecting the Company's public stockholders from
being taken advantage of by NSP's NRG unit would be negatively impacted since
Mr. Sherman has been instrumental in advising the Independent Directors
Committee with a view towards protecting the Company from overpaying for
projects offered by NRG under the Co-Investment Agreement.
    

                 INACCURACIES CONTAINED IN NRG'S PROXY STATEMENT

      The Company believes that certain misstatements and inaccuracies are
contained in NRG's Proxy Statement and Consent Statement.

o     Although NRG complains of communication failures within the Company, the
      Company and the Independent Directors know of no instances of failed
      communication except that of the NRG-employee directors neglecting to
      notify the Independent Directors of their intention to commence the NRG
      proxy solicitation.

o     The NRG proxy materials imply that if its proposal is successful, NRG will
      seek to terminate Mr. Sherman's employment with the Company "for cause".
      No facts have been presented supporting Mr. Sherman's termination for
      cause, nor does the Company believe that any such facts exist. The
      dismissal of Mr. Sherman in violation of his employment contract will
      result in substantial financial liabilities to the Company.

o     Despite implications to the contrary, the Company's financial performance
      for 1998 is positive, with pre-tax income up approximately 34% for the
      first 6 months compared to the same period for 1997.

o     NRG's statement that new projects and financing plans are not presented to
      the full Board of Directors is untrue.


                                       6
<PAGE>

            THE COMPANY'S GOOD FAITH ATTEMPTS TO RESOLVE NRG'S ISSUES

   
      The Independent Directors have attempted to engage both NSP and NRG in
discussions intended to resolve the issues addressed by the NRG Proxy Statement
and Consent Statement and to encourage the joint development of a plan to
maximize the Company's value for stockholders. On September 19, 1998, shortly
after the filing of NRG's preliminary proxy materials with the Securities and
Exchange Commission, the Independent Directors Committee sent a letter to the
Chairman and Chief Executive Officer of NSP, James J. Howard, seeking a meeting
to understand the basis for NRG's actions. No response was received and so, on
September 28, 1998, the Independent Directors Committee sent a second letter to
Mr. Howard. Although telephone conversations have taken place between
representatives of NSP and NRG on one hand and the Independent Directors
Committee on the other hand, no meaningful progress has been made towards
attempting to resolve NRG's (and NSP's) issues and explain the reasons for NRG's
(and NSP's) hostile actions. Copies of the letters referred to above are
attached as Exhibit 1 to this opposition solicitation.

                          PLAN FOR THE COMPANY'S FUTURE

      The NRG proxy materials do not disclose NRG's ultimate goals and plans for
the future of the Company. The Participants are concerned that if NRG were to
gain control, the inherent conflicting interests of the NRG employee directors
could result in important stockholder safeguards being lost.

      The Participants therefore propose the following plan for the Company.

      o     Ensure Continued Independent Management - The Company must act to
            guarantee that the independent management process that best serves
            the Company and its stockholders is not compromised. Equally
            important, the Participants believe that the opportunity for
            independent development of projects is crucial to the Company's
            future growth.

            To achieve these goals, the Company believes that the present
            management team, which does not answer solely to NRG, must be
            preserved while the Company explores the strategic alternatives
            available to it. If members of the Company's management are to be
            replaced, they must be replaced in an orderly process by candidates
            who are mutually acceptable to both the NRG-appointed directors and
            the Independent Directors Committee, and who have no prior
            affiliation with NRG or NSP.

      o     Evaluate Alternatives to the Present Ownership Structure - The
            Company should engage an appropriate financial adviser to assist the
            Board of Directors in evaluating all of the Company's strategic
            alternatives, including, but not limited to: possible acquisition of
            100% of the Company by a third party, or sale of NRG's 45% interest
            in the Company to a third party.
    


                                       7
<PAGE>

   
      o     Remove the Possibility of Deadlock Votes on the Board - Although no
            deadlock votes have yet occurred, the Participants believe it is not
            in the stockholders' best interests that the continued possibility
            of deadlock among the directors remains. The Participants therefore
            propose that one additional seat be created on the Board of
            Directors. The NRG-appointed directors and the Independent Directors
            Committee will agree to jointly nominate a candidate who is
            independent from, but mutually acceptable to, both groups.

      o     Require Agreement Before Amending the Company's Bylaws - To ensure
            the continuation of a meaningful voice for the public stockholders,
            the Participants propose that any future amendments to the Company's
            By-laws would require the agreement of the Independent Directors
            Committee.
    

                                   CONCLUSION

      The Company believes that, taking into account NRG's 45% ownership of the
Common Stock, an even division on the Board between NRG nominees and other
directors (a 50% representation) more than adequately represents that stock
ownership. However, four out of seven directors (or a 57% representation),
assuming that the vacancy resulting from Mr. Sherman's removal is not filled, or
five out of eight directors (or a 62.5% representation), assuming that the
vacancy is filled by a director named by NRG, would comprise an
over-representation on the Board. In seeking to be over-represented on the Board
of Directors of the Company, neither NSP nor NRG has offered any assurances of
continued independence of action to the Company. NRG has made no attempt to deal
with the existing conflicting obligations put upon the affiliates and officers
of NRG that it appoints to the Company's Board of Directors in such critical
areas as avoiding misappropriation of corporate opportunities, avoiding
conflicts in the development and implementation of competing business plans,
maintaining Company personnel distinct from NRG employees, or assuring
confidential technical and financial support for potential projects that may be
attractive to both NRG and the Company. In general, there has been no indication
from NSP or NRG as to how they will seek to achieve good corporate governance
for the benefit of all stockholders, rather than simply looking out for their
own interests. Of course, all of the Company's directors, whether NRG affiliates
or not, have a fiduciary duty to the Company and to all of its stockholders.

      NRG's hostile actions create uncertainty not only for the future direction
of the Company, and for the Company's stockholders, officers and customers, but
for the Company's sources of financing. At the present time, the Company is
seeking credit lines to finance its future growth, including, among other
matters, its purchase of the MCPC project. At least one prospective lender has
informed the Company that, in the face of NRG's pending hostile solicitation, it
will no longer pursue financing with the Company.

      In light of NRG's public statement that it has fulfilled its minimum
obligation to the Company under the Co-Investment Agreement, the Company and the
Independent Directors Committee believe that the future independence and success
of the Company depends on, among other matters, its ability to source and
operate power projects. The Company and the


                                       8
<PAGE>

Independent Directors Committee believe that NSP's and NRG's actions threaten
the Company's ability to achieve those necessary objectives.

      The Company and the Independent Directors Committee believe that it is in
the Company's best interest and the best interest of its public stockholders who
own a majority of the Company's stock and who are unaffiliated with NSP to
preserve the current balance of power existing both on the Company's Board of
Directors and between its management and a powerful minority stockholder.


                                       9
<PAGE>

                                   SCHEDULE A

                       INFORMATION REGARDING PARTICIPANTS

      Certain information concerning each of the directors and executive
officers of the Company who are Participants is set forth below.

      Lawrence I. Littman, age 67, has served as an Independent Director of the
Company since April 1996. Since May 1996, Mr. Littman has been a director of Car
One, a division of Liberty Cab & Limousine Company. He was Chief Executive
Officer of Liberty Cab & Limousine Company from 1967 to 1992 and General Manager
from 1992 to May 1996. From 1984 to June 1993, he served as Chief Executive
Officer of Lil Stable, Inc. Mr. Littman's business address is 1660 South A1A,
Apartment 212, Jupiter, Florida 33477-8449.

      Robert T. Sherman, Jr., age 45, has served as President, Chief Executive
Officer and a Director of the Company since May 1997. From 1991 to May 1997, Mr.
Sherman was Vice President at Cogen Technologies, Inc., a privately-held company
developing cogeneration projects. From 1985 to 1991, he served in various
capacities as a senior officer of CRSS Capital, Inc., a wholly-owned subsidiary
of CRSS Inc. that provides energy services to industrial companies. Mr.
Sherman's business address is One Carlson Parkway, Suite 240, Minneapolis,
Minnesota 55447-4454.

      Spyros S. Skouras, Jr., age 45, has served as an Independent Director of
the Company since July 1995. He is currently a Managing Director of S Three
Capital LLC. From April 1995 until May 1998, Mr. Skouras served as Senior Vice
President of Wexford Management LLC ("Wexford"). Prior to joining Wexford, Mr.
Skouras was President of Skouras Capital from 1991 to March 1995 and Chief
Operating Officer of Prudential-Grace Lines, Inc. from 1976 to 1990. Mr.
Skouras's business address is Three Stamford Plaza, 301 Tresser Boulevard, 9th
Floor, Stamford, Connecticut 06901.

   
      Charles J. Thayer, age 54, has served as an Independent Director of the
Company since April 1996. He has also served as Managing Director of Cartwell
Capital Ltd., a private NASD member investment firm, since 1989. He was Chairman
and Interim Chief Executive Officer of Sunbeam Corporation from January 1993 to
August 1993, Vice Chairman from April 1996 to August 1996 and a director from
1990 to April 1997. Mr. Thayer has served as Trustee of the Cystic Fibrosis
Foundation since 1980 and currently serves as Vice Chairman of the foundation
and as Chairman of the Board of Cystic Fibrosis Services. He is an Advisory
Director of the Louisville Community Development Bank. Mr. Thayer's business
address is P.O. Box 2247, Fort Lauderdale, Florida 33303-2247.
    

      Except as disclosed in this opposition solicitation, to the knowledge of
the Company, no Participant

      o     owns any securities of the Company or any subsidiary of the Company,
            beneficially or of record, or has purchased or sold any of such
            securities within the past two years;


                                      A-1
<PAGE>

      o     or any of their associates beneficially own, directly or indirectly,
            any securities of the Company;

      o     has any substantial interest, direct or indirect, by security
            holdings or otherwise, in any matter to be acted upon at the
            Meeting;

      o     is, or has been within the past year, a party to any contract,
            arrangement, or understanding with any person with respect to any
            securities of the Company, including, but not limited to, joint
            ventures, loan or option arrangements, puts or calls, guarantees
            against loss or guarantees of profit, division of losses or profits,
            or the giving or withholding of proxies;

      o     or any of their associates, has had or will have a direct or
            indirect material interest in any transaction or series of similar
            transactions since the beginning of the Company's last fiscal year
            or any currently proposed transactions, or series of similar
            transactions, to which the Company or any of its subsidiaries was or
            is to be a party in which the amount involved exceeds $60,000;

      o     or any of their associates, has any arrangements or understandings
            with any person with respect to any future employment by the Company
            or its affiliates or with respect to any future transactions to
            which the Company or any of its affiliates will or may be a party.

   
      Information regarding the ownership by each participant of the Company's
securities is set forth in this opposition solicitation under "Security
Ownership of Certain Beneficial Owners and Management".

      The following table sets forth information concerning purchases and sales
of shares of the Company's Common Stock by Participants, since October [26],
1996.

       Name                  Date       Nature of Transaction   Number of Shares
       ----                  ----       ---------------------   ----------------
Robert T. Sherman, Jr.   May 30, 1997          Purchase              5,000
                         August 20, 1998       Purchase                500

Charles J. Thayer        May 27, 1997          Purchase              3,000
                         May 30, 1997          Purchase              3,000
                         June 17, 1997         Purchase              4,000
    


                                      A-2
<PAGE>

         SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

      The following table sets forth certain information regarding shares of
Common Stock beneficially owned as of October 5, 1998 (except as otherwise noted
below) by each (i) person believed by the Company to own beneficially more than
five percent of the outstanding shares of Common Stock, (ii) director (which
does not include a director emeritus) and (iii) of the Company's three most
highly compensated executive officers, and the directors (which does not include
a director emeritus) and executive officers of the Company as a group, and the
percentage of the outstanding shares of Common Stock represented thereby. Other
than as set forth below, no director or executive officer of the Company is
known to be the beneficial owner of any shares of Common Stock. Except as noted
below, the Company believes that each of the persons listed has sole investment
and voting power with respect to the shares included in the table.

   
                                                  Shares Beneficially Owned (1)
                                                  -----------------------------
Name                                                Number of Shares  Percent
- -------------------------------------------------   ----------------  -------
NRG Energy, Inc. (2) 
1221 Nicollet Mall, Suite 700
Minneapolis, MN  55403-2445 .....................       3,254,288      47.36

Northern States Power Company (2) 
414 Nicollet Mall, Fourth Floor
Minneapolis, MN 55401............................       3,254,288      47.36

Wexford Capital Partners II, LP (3) 
411 West Putnam Avenue
Greenwich, CT  06830.............................         443,976       6.46

David H. Peterson (4) ...........................          11,000           *

Leonard A. Bluhm (5)(6) .........................          11,500           *

Julie A. Jorgensen (7) ..........................              --         --

Lawrence I. Littman (5) .........................          10,070           *

Craig A. Mataczynski (8) ........................          10,500           *

Robert T. Sherman, Jr. (9) ......................          40,500           *

Spyros S. Skouras, Jr. (10) .....................          10,000           *

Charles J. Thayer (11) ..........................          30,000           *

Ronald J. Will (12) .............................          12,500           *

Timothy P. Hunstad (13) .........................          25,500           *

Directors and Executive Officers as a group 
  (9 persons) (14)...............................         150,070       2.15
    

- ----------

*     Represents less than 1.0% of the outstanding shares of Common Stock.

(1)   Under the rules of the Commission, a person is deemed to be a beneficial
      owner of a security if he or she has or shares the power to vote or to
      direct the voting of such security, or the power to dispose or to direct
      the disposition of such security. A person is also deemed to be a
      beneficial owner of any securities that such person has the right to
      acquire beneficial ownership of within 60 days as well as any securities
      owned


                                      A-3
<PAGE>

      by such person's spouse, children or relatives living in the same
      household. Accordingly, more than one person may be deemed to be a
      beneficial owner of the same securities.

(2)   Includes 3,106,612 shares as to which NRG has sole voting and investment
      power, and 147,676 shares as to which NRG has sole voting power only. The
      shares listed as beneficially owned by NSP are owned by NRG, its
      wholly-owned subsidiary. The foregoing information is as of the date set
      forth in and based solely on a Schedule 13D filed April 14, 1998.

(3)   Includes 348,672 shares owned by Wexford Capital Partners II, LP and
      95,304 shares owned by Wexford Overseas Partners Fund I, LP. Through an
      investment management agreement, Wexford Management LLC, which manages the
      funds, has sole voting and investment power of the funds. This information
      is as of the date set forth in and based on the Schedule 13D filed May 8,
      1997 and other information furnished to the Company by Wexford Management
      LLC.

(4)   Includes 10,000 shares issuable upon exercise of stock options that may be
      exercised within 60 days of October 5, 1998. In addition, Mr. Peterson
      beneficially owns approximately 25,912 shares of NSP Common Stock,
      including approximately 7,708 shares of NSP Common Stock through an
      employee stock ownership plan and 18,204 shares issuable upon exercise of
      NSP stock options that may be exercised within 60 days of October 5, 1998.

(5)   Includes 10,000 shares issuable upon exercise of stock options that may be
      exercised within 60 days of April 10, 1998.

(6)   Mr. Bluhm resigned as Chief Executive Officer of the Company on April 30,
      1997.

(7)   Ms. Jorgensen beneficially owns approximately 24,067 shares of NSP Common
      Stock, including (i) approximately 372 shares of NSP Common Stock owned
      through an employee stock ownership plan, (ii) approximately 321 shares of
      NSP Common Stock held by Ms. Jorgensen's spouse through an employee stock
      ownership plan, (iii) approximately 4,076 shares of NSP Common Stock owned
      by Ms. Jorgensen's spouse, and for which she shares investment power and
      (iv) 18,590 shares of NSP Common Stock issuable upon exercise of NSP stock
      options owned by Ms. Jorgensen's spouse that may be exercised within 60
      days of October 5, 1998.

(8)   Includes 10,000 shares issuable upon exercise of stock options that may be
      exercised within 60 days of April 10, 1998. In addition, Mr. Mataczynski
      beneficially owns approximately 2,627 shares of NSP Common Stock,
      including approximately 1,131 shares of NSP Common Stock through an
      employee stock ownership plan and 1,496 shares of NSP Common Stock
      issuable upon exercise of NSP stock options that may be exercised within
      60 days of October 5, 1998.

(9)   Includes 35,000 shares issuable upon exercise of stock options that may be
      exercised within 60 days of April 10, 1998. In addition, Mr. Sherman
      beneficially owns 200 shares of NSP Common Stock.

(10)  Includes 10,000 shares issuable upon exercise of stock options that may be
      exercised within 60 days of April 10, 1998. Excludes shares held by
      Wexford Management LLC, Mr. Skouras's former employer.

(11)  Includes 10,000 shares issuable upon exercise of stock options that may be
      exercised within 60 days of April 10, 1998 and 10,000 shares owned by
      Chartwell Capital Ltd. Mr. Thayer is the principal and Managing Director
      of Chartwell Capital Ltd.

(12)  Represents 2,500 shares of Common Stock held jointly with his spouse and
      10,000 shares issuable upon exercise of stock options that may be
      exercised within 60 days of October 5, 1998. In addition, Mr. Will
      beneficially owns approximately 15,584 shares of NSP Common Stock,
      including (i) approximately 6,035 shares through an employee stock
      ownership plan, (ii) 5,272 shares issuable upon exercise of NSP stock
      options that may be exercised within 60 days of October 5, 1998, (iii)
      4,076 shares of NSP Common Stock which held by Mr. Will's spouse through
      an employee stock ownership plan and for which he shares


                                      A-4
<PAGE>

      investment power, and (iv) 201 shares of NSP Common Stock which he owns
      jointly with his spouse and for which he shares investment power.

(13)  Includes 25,000 shares issuable upon exercise of stock options that may be
      exercised within 60 days of April 10, 1998.

(14)  Includes 120,000 shares issuable upon exercise of stock options that may
      be exercised within 60 days of April 10, 1998.

                 CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

Administrative Transactions

      On January 31, 1996, the Company entered into a Management Services
Agreement with NRG. The Management Services Agreement provides that NRG will
provide management, administrative, operation, maintenance and certain other
services to the Company in connection with the day to day business of the
Company. The Company expensed approximately $562,000 during the fiscal year
ended December 31, 1997 pursuant to the Management Services Agreement with NRG.
In addition, the Company entered into a Leased Employee Agreement dated May 1,
1996 with NRG, whereby NRG agreed to lease its employee, Leonard A. Bluhm, to
the Company to perform the duties of President and Chief Executive Officer of
the Company. For the fiscal year ended December 31, 1997, the Company paid NRG
$7,252 which included the salary paid to Mr. Bluhm and other amounts necessary
to reimburse NRG for expenditures associated with or resulting from Mr. Bluhm's
employment.

Co-Investment Agreement

      On April 30, 1996, the Company also entered into a Co-Investment Agreement
with NRG. Pursuant to the Co-Investment Agreement, NRG agreed to offer to the
Company ownership interests in certain power projects which were initially
developed by NRG or with respect to which NRG has entered into a binding
acquisition agreement with a third party. If any eligible project reaches
certain contract milestones (which include the execution of a binding power
purchase agreement and fuel supply agreement and the completion of a feasibility
and engineering study) by April 30, 2003, NRG has agreed to offer to sell to the
Company all of NRG's ownership interest in such project. Eligible projects
include, with certain exceptions and exclusions, proposed or existing electric
power plants within the United States which NRG initially develops or in which
NRG proposes to acquire an ownership interest. NRG is obligated under the
Co-Investment Agreement to offer to the Company, during the three-year period
ending on April 30, 1999, projects with an aggregate equity value of at least
$60,000,000 or a minimum of 150 net Mega Watts ("MW"). As of the date of this
opposition solicitation, ownership interests in projects with an aggregate of
more than 130 net MW have been offered under the Co-Investment Agreement,
including the 117 net MW Morris Project described below.

      Among the exclusions from the Co-Investment Agreement are (i) any
ownership interest in a project which is below a level that would cause the
project (or its owners) to be in violation of the relevant power purchase
agreement or applicable state or federal law upon the generation of electricity
for sale by such project, (ii) any indirect ownership interest held by NRG in an
eligible project arising from NRG's direct or indirect ownership of equity
interests in the Company, (iii) any ownership interest in a facility below 25 MW
in capacity, and (iv) any


                                      A-5
<PAGE>

ownership interest that is retained in order to later be sold in an exempt
transaction. Exempt transactions include (a) any sale or disposition of an
ownership interest that is consummated as a result of a foreclosure or
conveyance in lieu of foreclosure of liens or security interests, (b) any sale
or disposition of an ownership interest to a third party that is or will become
a participant in the eligible project, where the obligation to sell the interest
is incidental to the provision of services or the contribution of assets to the
project and is created prior to the execution and delivery of a binding power
purchase agreement and fuel supply agreement and the completion of an
engineering and feasibility study with respect to the project, and (c) any sale
or disposition of an ownership interest as part of a larger transaction
involving the sale of all or substantially all of the assets of NRG or the sale
of an equity interest in NRG, provided that the person acquiring the ownership
interest agrees to be bound by the Co-Investment Agreement.

      In December 1997, a wholly-owned subsidiary of the Company purchased the
Morris Project from NRG. The Morris Project, with an aggregate of 117 net MW,
had been offered under the Co-Investment Agreement. Additionally, the Company
recently prevailed in an arbitration proceeding against NRG brought under the
Co-Investment Agreement regarding the Company's right of first refusal with
respect to the MCPC project - a 110 MW cogeneration facility in Pryor, Oklahoma.
In the arbitration, the Company contended that NRG, in violation of the
Co-Investment Agreement, improperly agreed to sell the MCPC project to a
third-party at a price approximately $10,000,000 below the original offer made
to the Company, without first offering it to the Company at the lower price.
Pursuant to the arbitration award, the Company has accepted NRG's offer to sell
the project on the same terms offered to the third party and expects to close
the transaction on or about October 15, 1998.

      To facilitate the Company's ability to acquire ownership interests which
may be offered pursuant to its Co-Investment Agreement, NRG has agreed to
finance the Company's purchase of such ownership interests at commercially
competitive terms to the extent funds are unavailable to the Company on
comparable terms from other sources. Any such financing provided by NRG under
the terms of the Co-Investment Agreement is required to be recourse to the
Company and secured by a lien on the ownership interest acquired. Such financing
also is required to be repaid from the net proceeds received by the Company from
offerings of equity or debt securities of the Company (when market conditions
permit such offerings to be made on favorable terms) after taking into account
the working capital and other cash requirements of the Company as determined by
its Board of Directors. During the fiscal year ended December 31, 1997, NRG
provided approximately $818,000 in project and construction management services
rendered in connection with the Gray's Ferry Project partnership, of which the
Company is one-third owner.

      In light of the Company's internal development activities, the Company
does not expect the Co-Investment Agreement to serve as the primary source of
future project development activities.

Sale of Power Operations, Inc.

      Power Operations, Inc. ("Power Operations"), then a wholly-owned
subsidiary of the Company, assumed operations and maintenance responsibilities
for the Company's Newark facility and the Company's Parlin facility, in each
case replacing the former operator, on


                                      A-6
<PAGE>

November 8, 1996 and December 31, 1996, respectively. Effective January 1, 1997,
Power Operations was sold by the Company to NRG for $10.00 plus the amount of
Power Operations' outstanding accounts receivable and an indemnification by NRG
to the Company for certain potential losses or other liabilities that might
occur with respect to the termination of the prior operator of the Newark and
Parlin facilities and the assumption by Power Operations of operations and
maintenance responsibilities for such facilities. The terms of this transaction
were approved by the Independent Directors Committee of the Company's Board of
Directors as required by the Company's By-laws.

NRG Option

      In March 1996, NRG and NRGG (Schuylkill) Cogeneration Inc. ("NSC"), a
wholly-owned subsidiary of the Company, entered into a $10,000,000 loan
agreement (the "Cogeneration Note") to provide a means of funding an NSC capital
contribution obligation to the Grays Ferry Cogeneration Partnership. In
connection with NRG's assistance with the Gray's Ferry project, its financing
and the Note, the Company granted NRG the right to convert a portion of
borrowings under the Note to Common Stock of the Company (the "Option"). On
November 25, 1997, NRG exercised such option and reduced the outstanding
principal amount of the Note by $3,000,000 in exchange for 396,255 shares of the
Company's Common Stock.

Morris Project Acquisition

      In December 1997, NRGG Funding Inc. ("NRGG Funding"), a wholly-owned
subsidiary of the Company, completed its acquisition from NRG of all of NRG's
interest in a 117 MW project located in Morris, Illinois by acquiring 100% of
the interests in NRG (Morris) Cogen, LLC ("Morris LLC"). Morris LLC has the
exclusive right to build and operate a cogeneration plant to be located in
Morris, Illinois within a petrochemical manufacturing facility, which is owned
by Equistar Chemicals LP ("Equistar"), a joint venture of Millennium Chemicals
Inc. and Lyondell Petrochemical Company. A 25-year agreement has been executed
for the sale of steam and electric output from the project. NRG commenced
construction of the Morris Project in September 1997 with commercial operation
currently expected to occur in the fourth quarter of 1998.

      NRGG Funding agreed to assume all of the obligations of NRG and to provide
future equity contributions to Morris LLC which are limited to the lesser of 20%
of the total project cost or $22,000,000. NRG has guaranteed to the Morris
Project's lenders that NRGG Funding will make these future equity contributions,
and the Company has guaranteed to NRG the obligation of NRGG Funding to make
these future equity contributions. In addition, Morris LLC is obligated to pay
NRG $1,000,000 as and when permitted under the project's principal loan
agreement. Morris LLC has previously paid $4,000,000 to NRG in connection with
the financial closing of the construction financing of the Morris Project.

      The Company intends to arrange financing (the terms and manner of which
have not been determined by the Company) to fund the required future equity
contributions to Morris LLC. NRG is obligated under a Supplemental Loan
Agreement between the Company, NRGG Funding and NRG to loan NRGG Funding and the
Company (as co-borrower) the full amount of such equity contributions by NRGG
Funding, all at NRGG Funding's option. Any such loan


                                      A-7
<PAGE>

will be secured by a lien on all of the membership interests of Morris LLC and
will be fully recourse to NRGG Funding and the Company.

Other Transactions

      Effective May 23, 1996, NRG guaranteed payment of pre-existing liabilities
of NRG Generating (Newark) Cogeneration Inc. ("Newark") and NRG Generating
(Parlin) Cogeneration Inc. ("Parlin"), wholly-owned subsidiaries of the Company,
of up to $5,000,000, which amount will be reduced as certain defined milestones
are reached and eliminated no later than May 23, 2001. On June 28, 1996, NRG
advanced Parlin approximately $56,000,000 to pay off the Parlin nonrecourse
financing which included a $3,100,000 million cost to terminate an interest rate
swap agreement. At December 31, 1997, loans aggregating approximately $4,400,000
million remained outstanding to NRG.

      Under an agreement dated April 30, 1996, the Parlin project sells up to 9
MW of power to NRG Parlin, Inc. ("NPI"), a wholly-owned subsidiary of NRG. NPI
resells this power at retail to E.I. du Pont under an agreement extending until
2021. Total sales to NPI were $1,300,000 million in 1997.

Related Party Transactions

      The Company entered into a Liquidating Asset Agreement with Wexford
pursuant to which Wexford was granted authority to liquidate certain assets of
the Company for which Wexford is to receive an asset liquidation fee. The
maximum fee available to Wexford is $1,500,000. During the fiscal year ended
December 31, 1997, Wexford was paid $1,219,000 under the terms of the
Liquidating Asset Agreement. Spyros S. Skouras, Jr., a director of the Company,
was Senior Vice President of Wexford from April 1995 until May 1998.

                    EMPLOYMENT ARRANGEMENTS WITH MR. SHERMAN

      On March 28, 1998, the Company and Mr. Sherman entered into an employment
agreement (the "Employment Agreement") pursuant to which Mr. Sherman is employed
as President and Chief Executive Officer of the Company. Under the Employment
Agreement, Mr. Sherman was entitled during 1997 to receive an annual base salary
of $210,000 (prorated for the period of time he served during 1997) and a bonus
of 60% of such annual base salary. In addition, pursuant to the Employment
Agreement the Company paid Mr. Sherman a $40,000 signing bonus and granted him
options to purchase an aggregate 205,000 shares of Common Stock. Such options
contain a change of control provision which provides for the acceleration of
such options, to the extent not then vested, upon a "change in control" and
certain other "corporate transactions" as defined in the Company's 1997 Stock
Option Plan. The Employment Agreement also contains restrictive covenants which
restrict Mr. Sherman with respect to work product and his ability to compete
with the Company and to appropriate certain business opportunities during his
employment and for one year following the date of termination of his employment.


                                      A-8
<PAGE>

   
      Mr. Sherman and his attorneys have been engaged in discussion with
representatives of NSP and NRG which would lead to his immediate or eventual
resignation as an officer and director of the Company, in an effort to avoid the
proxy contest with respect to the Meeting. To date, such negotiations have not
been successful.
    

                                  OTHER MATTERS

      Under Delaware law, no business may be transacted at the Meeting other
than the NRG Proposal. If any procedural matters are properly brought before the
Meeting, the proxies named in the enclosed WHITE proxy card will vote on those
matters in accordance with their judgment of the best interests of the Company.

      The Company will bear the expense of preparing, printing and mailing this
opposition solicitation and the solicitation of the WHITE proxies for the
Meeting. It is currently estimated that the aggregate amount to be spent by the
Company in connection with the solicitation of proxies, excluding the salaries
and fees of directors, officers and employees, will be approximately $[ ], of
which approximately $[ ] has been incurred to date. It is anticipated that
approximately [ ] employees, directors and officers of the Company may solicit
proxies by letter, telephone, telecopy, telegraph, facsimile, or in person
without additional compensation therefor. The Company will also provide certain
persons, firms, banks and corporations holding shares in the names or in the
names of nominees, which in either case are beneficially owned by others, proxy
materials for transmittal to such beneficial owners and will reimburse such
record owners for their expenses in doing so.

                              SHAREHOLDER PROPOSALS

      The 1999 Annual Meeting of Stockholders is anticipated to be held in May
1999. A notice of intent of a stockholder of the Company to make a nomination or
to bring any other matter before the 1999 Annual Meeting must comply with the
applicable requirements set forth in the Company's Restated By-laws and must be
received not more than 180 days and not less than 120 days in advance of the
1999 Annual Meeting by the Secretary of the Company at the Company's principal
executive offices, One Carlson Parkway, Suite 240, Minneapolis, Minnesota
55447-4454. However, if the 1999 Annual Meeting is held on a date more than 30
days before or after May 21, 1999, any stockholder who wishes to have a proposal
included in the Company's proxy statement for the 1999 Annual Meeting must
deliver a copy of the proposal to the Company a reasonable time before the proxy
solicitation is made. The Company reserves the right to decline to include in
the Company's proxy materials any stockholder's proposal which does not comply
with the rules of the Commission for inclusion therein. The Company will furnish
copies of the applicable By-law provisions which set forth the requirements for
the Notice of Intent upon written request to the Secretary of the Company at the
aforementioned address.


                                      A-9
<PAGE>

                                    EXHIBIT 1

                               September 19, 1998

Mr. James J. Howard
Chairman & CEO
Northern States Power
414 Nicollet Mall
Minneapolis, MN 55401

Dear Mr. Howard,

As an independent outside director of several public companies, we know you
understand a director's duties and responsibilities. We, the independent outside
directors of CogenAmerica, have those same duties and responsibilities. We are
clearly disappointed that your subsidiary, NRG Energy, has announced a hostile
proxy solicitation to obtain 'control' of CogenAmerica.

We are truly puzzled by NRG's objective. The existing conflicts of interest with
CogenAmerica's public shareholders remain - even in the event NRG's proposed
proxy solicitation is successful. Questions of 'conflict of interest' and
'corporate opportunity' do not disappear with 'control' of a public company; as
you know, the standard of conduct actually becomes more onerous.

   
CogenAmerica and NRG both compete in the market for new projects, as a result,
NRG has a perpetual conflict of interest with CogenAmerica's public
shareholders. NSP has an interest in two IPP's, and these interests are not
easily reconciled. The bankruptcy court sought to balance this situation with
the establishment of the independent directors committee.
    

The independent directors have made concerted efforts over the past year to help
NRG management understand the very difficult situation their actions can create,
including recent events regarding MCPC.

   
As you may know, NRG offered to sell MCPC, under the terms of the co-investment
agreement, to CogenAmerica for approximately $36 million. This offer was not
recommended by management and was rejected by the independent directors
committee - the price was determined to be 'above market' and represented a
potential unwarranted and excessive price (events now indicate approximately $10
million) for NRG at the expense of CogenAmerica's public shareholders. We all
(including NSP) would have had exposure to shareholder action had the
independent directors acted on NRG's initial representatives.
    

As you know, the MCPC matter is complicated by NRG's agreement, despite its
obligation to CogenAmerica, to sell MCPC to a third party. We know NRG can't
sell MCPC twice. We recognize that NRG management believes that it is in the
best interests of CogenAmerica for MCPC to be sold to a third party. We offered
to let NRG substitute a project of equivalent value for MCPC. The objective of
<PAGE>

the arbitration was to serve the economic interests of CogenAmerica shareholders
- - not harm NRG. This offer remains open - it appears to be in everyone's best
interest.

The MCPC situation represents just one of many conflicts created by NRG
management's actions. As a result, we are very troubled by NRG's proposal to
control the board and designate the CEO. In the absence of an independent CEO
the independent directors committee will find it necessary to rely on
independent outside advisors for independent advice.

There are always two sides to every story - our intention today is to share our
views with you. We hope you better understand the untenable situation that
certain NRG actions create for us as directors of CogenAmerica and that you
question the wisdom of NRG's proposed proxy solicitation, in light of what it
will and won't accomplish.

   
NRG's announcement to conduct a hostile proxy solicitation clearly disrupts
CogenAmerica's acquisition and financing efforts and will cause economic harm to
all CogenAmerica shareholders. We urge you to seek a resolution of this
situation in the interest of all our shareholders.
    

We respectfully request a meeting with you to discuss alternatives to resolve
this situation in the best interests of CogenAmerica shareholders. We believe it
is in everyone's best interest to avoid confrontation.

Thank you for your consideration.

                                                Sincerely,

                                        Charles J. Thayer, on behalf
                                        of all the members of the
                                        Independent Directors
                                        Committee of CoGeneration
                                        Corporation of America
                                              Lawrence I. Littman
                                              Spyros S. Skouras
                                              Charles J. Thayer

<PAGE>

                               September 28, 1998

Mr. James J. Howard
Chairman & CEO
Northern States Power
414 Nicollet Mall
Minneapolis, MN 55401

Dear Mr. Howard,

We are disappointed that you have not responded to our letter of September 19th
requesting a meeting with you to discuss resolution of the issues related to NRG
Energy's proposed hostile proxy solicitation to obtain control of CogenAmerica.

It is surprising to us that NSP, a highly respected public utility that
practices 'independent' board governance, would support NRG's action - a
proposal that contradicts the very definition of 'independent' boards as
recommended by such organizations as The Business Roundtable, The Council of
Institutional Investors and the National Association of Corporate Directors.

We remain concerned that NRG's proposal to replace independent management does
not contain any NRG plan to grow CogenAmerica shareholder value. Especially in
light of NRG's public announcement that it has fulfilled its obligations under
the co-investment agreement.

We remain committed to meeting with you to discuss alternatives to resolve this
situation in the best interests of all CogenAmerica shareholders and avoid
further disruption to CogenAmerica's business.

                                                Sincerely,

                                        Charles J. Thayer, on behalf
                                        of all the members of the
                                        Independent Directors
                                        Committee of CoGeneration
                                        Corporation of America
                                              Lawrence I. Littman
                                              Spyros S. Skouras
                                              Charles J. Thayer

<PAGE>

                               Preliminary Copies

                       COGENERATION CORPORATION OF AMERICA

          PROXY FOR SPECIAL MEETING OF STOCKHOLDERS - NOVEMBER 12, 1998

                THIS PROXY IS SOLICITED ON BEHALF OF THE COMPANY.

        THIS PROXY IS NOT SOLICITED BY THE COMPANY'S BOARD OF DIRECTORS.

      The undersigned hereby constitutes and appoints Robert T. Sherman, Jr.,
Lawrence I. Littman, Spyros S. Skouras, Jr. and Charles J. Thayer, or any of
them acting singly, with the power of substitution in any of them, the proxies
of the undersigned to act for the undersigned with the same force and effect as
the undersigned, with respect to all shares of Common Stock of Cogeneration
Corporation of America (the "Company") held of record by the undersigned on
October 8, 1998, at the Special Meeting of Stockholders (the "Meeting") to be
held at the Hyatt Regency Hotel, 1300 Nicollet Mall, Minneapolis, Minnesota
55403 at 8:00 a.m. on November 12, 1998, and at any adjournment(s) thereof,
hereby revoking any proxy or consent heretofore given, and ratifying and
confirming all that said proxies may do or cause to be done by virtue thereof,
with respect to the matters contained herein. By granting this proxy, the
undersigned expressly confers the authority to vote all shares of common stock
of the Company held of record by the undersigned or to boycott the Meeting, as
set forth below.

   
      This proxy, when properly executed, unless a decision is made to boycott
the Meeting, will be voted as directed. If no direction is indicated and a
decision is not made to boycott the Meeting, this proxy will be voted AGAINST
the proposal of NRG Energy, Inc., a stockholder of the Company, to remove Robert
T. Sherman, Jr. from his position as a member of the Company's Board of
Directors. In their discretion, the proxies named above are authorized to vote
upon such other matters as may properly come before the Meeting or at any
adjournment(s) thereof. The proxies named above are also authorized, in their
discretion, to boycott the Meeting if they determine that doing so will be the
most effective way to prevent the removal of Robert T. Sherman, Jr. from his
position as a member of the Company's Board of Directors (i.e., by preventing
the presence of quorum at the Meeting).
    

      Shares cannot be voted unless this proxy card is signed and returned.

                         (To be Signed on Reverse Side)

<PAGE>

o     REMOVAL OF DIRECTOR. To remove Robert T. Sherman, Jr. from the Company's
      Board of Directors.

      FOR |_|      AGAINST |_|      ABSTAIN |_|

   
o     Discretion to vote upon such other matters as may properly come before the
      Meeting or at any adjournment(s) thereof.

o     Discretion to boycott the Meeting if it is determined that doing so will
      be the most effective way to prevent the removal or Robert T. Sherman, Jr.
      from his position as a member of the Company's Board of Directors.

Although executing this proxy card and marking a box above grants the persons
named on the other side of this proxy the authority to vote your shares of
common stock of the Company, you should be aware that by executing this proxy
card your shares may not be voted at all if such persons determine that
boycotting the Meeting will prevent the presence of a quorum at the Meeting.

PLEASE SIGN, DATE AND MAIL THIS PROXY IMMEDIATELY IN THE ENCLOSED ENVELOPE. The
undersigned hereby acknowledges receipt of the Solicitation in Opposition to
Proxy Statement and Consent Statement of NRG Energy, Inc. dated October [26],
1998.
    


                                        Date:                             , 1998
                                             -----------------------------


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


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                                                Signature if held jointly

Please sign your name above exactly as it appears hereon. When signing as
attorney, executor, administrator, trustee, or guardian, please give your full
title as it appears hereon. When signing as joint tenants, all parties in the
joint tenancy must sign. When a proxy is given by a corporation, it should be
signed by an authorized officer and the corporate seal affixed. When a proxy is
given by a partnership, it should be signed in the partnership name by an
authorized person.


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