SIERRA PACIFIC POWER CO
S-3/A, 1996-06-04
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>


     As filed with the Securities and Exchange Commission on June 4, 1996

                                                     Registration No. 333-4032


                        SECURITIES AND EXCHANGE COMMISSION
                              Washington, D.C.  20549
                                __________________
                                  AMENDMENT NO. 1
                                        TO
                                     FORM S-3
                              REGISTRATION STATEMENT
                         UNDER THE SECURITIES ACT OF 1933

<TABLE>
<CAPTION>

<S>                                             <C>                                 <C>
SIERRA PACIFIC POWER CAPITAL I                           Delaware                    To Be Applied For
SIERRA PACIFIC POWER COMPANY                             Nevada                         88-0044418
(Exact name of Each Registrant as specified     (State or other Jurisdiction of      (I.R.S. Employer
            in its Charter)                      Incorporation or Organization)    Identification Number)

</TABLE>

                       P.O. Box 10100 (6100 Neil Road)
                             Reno, Nevada  89520
                                (702) 689-4011

              (Address, including zip code, and telephone number,
     including area code, of each registrant's principal executive offices)

                                __________________

                             WILLIAM E. PETERSON, ESQ.
         Senior Vice President, Corporate Secretary and General Counsel
                            Sierra Pacific Power Company
                           P.O. Box 10100 (6100 Neil Road)
                                 Reno, Nevada  89520
                                   (702) 689-4011
            (Name, address, including zip code, and telephone number,
          including area code, of agent for service for each registrant)

                                __________________

                  Please send copies of all communications to:

        WILLIAM C. ROGERS, ESQ.                        DAVID C. CHAPIN, ESQ.
        Choate, Hall & Stewart                             Ropes & Gray
           Exchange Place                             One International Place
           53 State Street                          Boston, Massachusetts  02110
      Boston, Massachusetts  02109                          (617) 951-7000
           (617) 248-5000

                                __________________

Approximate Date of Commencement of Proposed Sale to Public:  As soon as 
practicable after the effective date of the Registration Statement.

    If the only securities being registered on this Form are being offered 
pursuant to dividend or interest reinvestment plans, please check the 
following box:  [   ]



<PAGE>


    If any of the securities being registered on this Form are to be offered 
on a delayed or continuous basis pursuant to Rule 415 under the Securities 
Act of 1933, as amended, other than securities offered only in connection 
with dividend or interest reinvestment plans, please check the following
box:  [   ]

    If this Form is filed to register additional securities for an offering 
pursuant to Rule 462(b) under the Securities Act, please check the following 
box and list the Securities Act registration statement number of the earlier 
effective registration statement for the same offering.  [   ]

    If this Form is a post-effective amendment filed pursuant to Rule 462(c) 
under the Securities Act, check the following box and list the Securities Act 
registration statement number of the earlier effective registration statement 
for the same offering.  [   ]

    If delivery of the prospectus is expected to be made pursuant to Rule 
434, please check the following box.  [   ]



<PAGE>


                       CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>

                                                      PROPOSED          PROPOSED
                                                      MAXIMUM           MAXIMUM
                                                   OFFERING PRICE       AGGREGATE
 TITLE OF EACH CLASS OF            AMOUNT TO BE       PER UNIT        OFFERING PRICE          AMOUNT OF
SECURITIES TO BE REGISTERED       REGISTERED (1)      (1)(2)(3)         (1)(2)(3)        REGISTRATION FEE (2)
- ---------------------------       --------------   --------------     --------------     --------------------
<S>                               <C>              <C>                <C>                <C>

Preferred Securities of              1,940,000          100%            $48,500,000            $16,725
  Sierra Pacific Power
  Capital I

Junior Subordinated                                                     $48,500,000
  Debentures
  of Sierra Pacific Power
  Company.................

Guarantee of Preferred
  Securities of Sierra Pacific
  Power Capital I, by Sierra
  Pacific Power Company
  and certain back-up
  undertakings (4)..........

Total                                                   100%            $48,500,000            $16,725
                                                        ----            -----------            -------
                                                        ----            -----------            -------

</TABLE>

(1)  In United States dollars or the equivalent thereof in any other currency
     unit or units or composite currency or currencies.  Such amount 
     represents the aggregate offering price of the Preferred Securities of 
     Sierra Pacific Power Capital I and the Junior Subordinated Dbentures of 
     Sierra Pacific Power Company to be issued.  Junior Subordinated 
     Debentures may be issued and sold to Sierra Pacific Power Capital I, in 
     which event such Junior Subordinated Debentures may later be distributed 
     to the holders of Preferred Securities upon a dissolution of Sierra 
     Pacific Power Capital I and the distribution of the assets thereof.

(2)  Estimated solely for the purpose of calculating the registration fee
     pursuant to Rule 457 under the Securities Act of 1933, as amended. The
     aggregate public offering price of the Preferred Securities of Sierra
     Pacific Power Capital I and the Junior Subordinated Debentures of Sierra
     Pacific Power Company registered hereby will not exceed $48,500,000 and 
     no separate consideration will be received for the Junior Subordinated
     Debentures of Sierra Pacific Power Company.

(3)  Exclusive of accrued interest and distributions, if any.

(4)  No separate consideration will be received for the Guarantee. The
     Guarantee includes the rights of holders of the Preferred Securities 
     under the Guarantee and certain back-up undertakings, comprised of 
     obligations of Sierra Pacific Power Company under the Indenture and any 
     supplemental indenture thereto and pursuant to the Declaration of Trust, 
     to provide certain indemnities in respect of, and be responsible for 
     certain costs, expenses, debt and liabilities of the Trust, each as 
     described in the Registration Statement. All obligations under the 
     Indenture and the Declaration of Trust, including the indemnity 
     obligations, are included in the back-up undertakings.

 THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR 
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS 
SHALL FILE A FURTHER AMENDMENT THAT SPECIFICALLY STATES THAT THIS 
REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH 
SECTION 8(A) OF THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THE 
REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE COMMISSION, 
ACTING PURSUANT TO SAID SECTION 8(A), MAY DETERMINE.



<PAGE>
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 STATE IN WHICH SUCH OFFER,  SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
   
                    SUBJECT TO COMPLETION DATED JUNE 4, 1996
    
PROSPECTUS
                         1,940,000 PREFERRED SECURITIES
 
                         SIERRA PACIFIC POWER CAPITAL I
            % TRUST ORIGINATED PREFERRED SECURITIES-SM- ("TOPRS-SM-")
                (LIQUIDATION AMOUNT $25 PER PREFERRED SECURITY)
                  GUARANTEED TO THE EXTENT SET FORTH HEREIN BY
 
                          SIERRA PACIFIC POWER COMPANY
                               ------------------
 
   
    The   % Trust  Originated Preferred Securities (the "Preferred  Securities")
offered  hereby represent preferred undivided  beneficial ownership interests in
the assets of Sierra Pacific Power Capital I, a statutory business trust  formed
under  the  laws of  the  State of  Delaware  ("Sierra Pacific  Capital"  or the
"Trust"). Sierra Pacific Power Company,  a Nevada corporation ("Sierra  Pacific"
or  the "Company"),  will directly or  indirectly own all  the common securities
issued by the Trust  (the "Common Securities" and,  together with the  Preferred
Securities,  the "Trust Securities") representing undivided beneficial interests
in the assets of Sierra Pacific Capital.  The Trust exists for the sole  purpose
of issuing the Preferred Securities and Common Securities and using the proceeds
thereof  to purchase from Sierra Pacific its    % Junior Subordinated Debentures
due 2036  (the  "Junior Subordinated  Debentures")  having the  terms  described
herein.  The  Junior  Subordinated  Debentures  when  issued  will  be unsecured
obligations of Sierra  Pacific, will be  issued pursuant to  an Indenture  which
will  be qualified  under and  subject to  the Trust  Indenture Act  of 1939, as
amended, and will be Subordinate and junior in right of payment to
    
                                                        (CONTINUED ON NEXT PAGE)
 
   
    SEE "RISK  FACTORS" BEGINNING  ON PAGE  10 OF  THIS PROSPECTUS  FOR  CERTAIN
INFORMATION RELEVANT TO AN INVESTMENT IN THE PREFERRED SECURITIES, INCLUDING THE
PERIOD AND CIRCUMSTANCES DURING AND UNDER WHICH PAYMENTS OF DISTRIBUTIONS ON THE
PREFERRED  SECURITIES  MAY BE  DEFERRED AND  THE  RELATED UNITED  STATES FEDERAL
INCOME TAX CONSEQUENCES OF SUCH DEFERRAL.
    
 
    Application has been made to list  the Preferred Securities on the New  York
Stock  Exchange, Inc.  (the "NYSE").  If so  approved, trading  of the Preferred
Securities on the NYSE is expected to commence within a 30-day period after  the
initial delivery of the Preferred Securities. See "Plan of Distribution."
                            ------------------------
 
THESE  SECURITIES 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  PROSPECTUS. ANY
                REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                             INITIAL PUBLIC
                                                OFFERING        UNDERWRITING      PROCEEDS TO
                                                PRICE(1)       COMMISSION (2)     TRUST (3)(4)
<S>                                         <C>               <C>               <C>
Per Preferred Security....................       $25.00             (3)              $25.00
Total.....................................    $48,500,000           (3)           $48,500,000
</TABLE>
 
(1) Plus accrued distributions, if any, from the date of issuance.
 
(2) Sierra  Pacific Capital  and Sierra  Pacific have  agreed to  indemnify  the
    several  Underwriters  against  certain  liabilities,  including liabilities
    under the Securities Act of 1933, as amended. See "Plan of Distribution."
 
(3) In  view  of the  fact  that  the proceeds  of  the sale  of  the  Preferred
    Securities  will be invested  in the Junior  Subordinated Debentures, Sierra
    Pacific  has  agreed  to  pay  to  the  Underwriters  as  compensation  (the
    "Underwriters'  Compensation") for their arranging the investment therein of
    such proceeds $       per Preferred Security (or $       in the  aggregate);
    provided,  that  such compensation  for sales  of  10,000 or  more Preferred
    Securities to a  single purchaser will  be $        per Preferred  Security.
    Therefore,  to the extent of such  sales, the actual amount of Underwriters'
    Compensation will  be  less  than  the aggregate  amount  specified  in  the
    preceding sentence. See "Plan of Distribution."
 
   
(4)  Expenses of the offering which are  payable by Sierra Pacific are estimated
    to be $290,000.
    
 
    The Preferred  Securities  offered  hereby  are  offered  severally  by  the
Underwriters, as specified herein, subject to receipt and acceptance by them and
subject  to their right to reject any order  in whole or in part. It is expected
that delivery of the Preferred Securities  will be made only in book-entry  form
through  the facilities of The Depository Trust Company, on or about           ,
1996.
                            ------------------------
 
MERRILL LYNCH & CO.
             DEAN WITTER REYNOLDS INC.
                          A.G. EDWARDS & SONS, INC.
                                                          LEGG MASON WOOD WALKER
                                                            INCORPORATED
                            ------------------------
 
   
                 THE DATE OF THIS PROSPECTUS IS JUNE   , 1996.
    
 
- -SM-"Trust Originated Preferred  Securities" and  "TOPrS" are  service marks  of
Merrill Lynch & Co., Inc.
<PAGE>
(continued from previous page)
 
   
certain  other indebtedness of Sierra Pacific as described herein. Upon an event
of a default under the Declaration (as defined herein), the holders of Preferred
Securities will have a preference over the holders of the Common Securities with
respect to payments in  respect of distributions  and payments upon  redemption,
liquidation and otherwise.
    
 
   
    Holders  of the Preferred Securities will  be entitled to receive cumulative
cash distributions at an annual rate of   % of the liquidation preference of $25
per Preferred Security, accruing from the date of original issuance and  payable
quarterly  in arrears on March 31, June 30, September 30 and December 31 of each
year, commencing September 30, 1996  ("distributions"). See "Description of  the
Preferred  Securities  --  Distributions".  The  payment  of  distributions  and
payments on liquidation of the Trust or the redemption of Preferred  Securities,
described  below  (but only  to  the extent  funds  of the  Trust  are available
therefor), are guaranteed by Sierra Pacific to the extent described herein  (the
"Guarantee").   The  Guarantee,  when  taken   together  with  Sierra  Pacific's
obligations under  the  Indenture  pursuant to  which  the  Junior  Subordinated
Debentures  are issued  and its  obligations under  the Declaration  (as defined
herein), including its liabilities to pay costs, expenses, debts and liabilities
of Sierra Pacific  Capital (other than  with respect to  the Trust  Securities),
provides  a full  and unconditional  guarantee of  amounts due  on the Preferred
Securities. See  "Risk  Factors  --  Rights Under  the  Guarantee"  herein.  The
obligations  of Sierra Pacific under the Guarantee are subordinate and junior in
right of payment to all other liabilities of Sierra Pacific and PARI PASSU  with
the  most senior preferred  stock issued, from  time to time,  if any, by Sierra
Pacific. The  obligations  of  Sierra  Pacific  under  the  Junior  Subordinated
Debentures  are subordinate and  junior in right  of payment to  all present and
future  Senior  Indebtedness  (as  defined  herein)  of  Sierra  Pacific,  which
aggregated  approximately $463 million at December 31, 1995, and rank PARI PASSU
with Sierra Pacific's other general unsecured creditors. The Junior Subordinated
Debentures purchased by the  Trust may be subsequently  distributed pro rata  to
holders of the Preferred Securities and Common Securities in connection with the
dissolution of the Trust, upon the occurrence of certain events.
    
 
    The  distribution rate and  the distribution payment  date and other payment
dates for the  Preferred Securities  will correspond  to the  interest rate  and
interest  payment  date  and  other payment  dates  on  the  Junior Subordinated
Debentures, which  will  be the  sole  assets of  the  Trust. As  a  result,  if
principal  or interest  is not  paid on  the Junior  Subordinated Debentures, no
amounts will be  paid on the  Preferred Securities. If  Sierra Pacific does  not
make  principal or interest payments on  the Junior Subordinated Debentures, the
Trust will not  have sufficient  funds to  make distributions  on the  Preferred
Securities,  in which event, the Guarantee  will not apply to such distributions
until the Trust has sufficient funds available therefor.
 
    So long as Sierra Pacific shall not be in default in the payment of interest
on the Junior  Subordinated Debentures, Sierra  Pacific has the  right to  defer
payments  of interest  on the  Junior Subordinated  Debentures by  extending the
interest payment period on the Junior Subordinated Debentures at any time for up
to 20 consecutive quarters (each,  an "Extension Period"). If interest  payments
are  so deferred,  distributions will  also be  deferred. During  such Extension
Period, distributions  will continue  to accrue  with interest  thereon (to  the
extent  permitted  by  applicable law)  at  an annual  rate  of     %  per annum
compounded quarterly,  and during  any Extension  Period, holders  of  Preferred
Securities  will be required to include  deferred interest income in their gross
income for United States  federal income tax purposes  in advance of receipt  of
the  cash distributions with  respect to such  deferred interest payments. There
could be multiple Extension  Periods of varying lengths  throughout the term  of
the  Junior Subordinated Debentures. See "Description of the Junior Subordinated
Debentures -- Option to Extend Interest Payment Period," "Risk Factors -- Option
to Extend Interest Payment Period" and "United States Federal Income Taxation --
Original Issue Discount."
 
   
    The Junior  Subordinated Debentures  are redeemable  by Sierra  Pacific,  in
whole  or in part, from time to time, on or  after June   , 2001, or at any time
in certain circumstances upon the occurrence of a Tax Event (as defined herein).
If Sierra Pacific redeems Junior Subordinated Debentures, the Trust must  redeem
Trust  Securities on  a PRO  RATA basis  having an  aggregate liquidation amount
equal to the aggregate principal amount of the Junior Subordinated Debentures so
redeemed at $25 per Preferred Security plus accrued and
    
 
                                       2
<PAGE>
unpaid distributions  thereon (the  "Redemption Price")  to the  date fixed  for
redemption.   See  "Description   of  the  Preferred   Securities  --  Mandatory
Redemption." The  Preferred Securities  will be  redeemed upon  maturity of  the
Junior  Subordinated Debentures.  The Junior  Subordinated Debentures  mature on
         , 2036. In addition, upon the occurrence of a Tax Event arising from  a
change  in law or a change in legal interpretation regarding tax matters, unless
the Junior Subordinated  Debentures are  redeemed in  the limited  circumstances
described  herein, the Trust shall be dissolved, with the result that the Junior
Subordinated Debentures  will be  distributed to  the holders  of the  Preferred
Securities,  on  a  PRO  RATA  basis, in  lieu  of  any  cash  distribution. See
"Description  of  the   Preferred  Securities   --  Tax   Event  Redemption   or
Distribution."  In certain circumstances, Sierra Pacific  will have the right to
redeem the Junior Subordinated Debentures, which would result in the  redemption
by  the Trust of Trust Securities in the same amount on a PRO RATA basis. If the
Junior Subordinated Debentures are distributed  to the holders of the  Preferred
Securities,  Sierra  Pacific  will  use  its best  efforts  to  have  the Junior
Subordinated Debentures listed  on the  NYSE or on  such other  exchange as  the
Preferred  Securities  are  then  listed.  See  "Description  of  the  Preferred
Securities --  Tax Event  Redemption or  Distribution" and  "Description of  the
Junior Subordinated Debentures."
 
   
    In  the event  of the  involuntary or  voluntary dissolution,  winding up or
termination of  the Trust,  the  holders of  the  Preferred Securities  will  be
entitled to receive for each Preferred Security a liquidation amount of $25 plus
accrued  and  unpaid distributions  thereon (including  interest thereon  to the
extent permitted  by  applicable  law)  to  the  date  of  payment,  unless,  in
connection  with  such  dissolution,  the  Junior  Subordinated  Debentures  are
distributed to the holders of the Preferred Securities. See "Description of  the
Preferred Securities -- Liquidation Distribution Upon Dissolution."
    
 
   
    IN  CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS THAT  STABILIZE OR  MAINTAIN  THE MARKET  PRICE OF  THE  SECURITIES
OFFERED  HEREBY AT LEVELS ABOVE  THOSE THAT MIGHT OTHERWISE  PREVAIL IN THE OPEN
MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NEW YORK STOCK EXCHANGE, IN THE
OVER-THE-COUNTER  MARKET  OR  OTHERWISE.   SUCH  STABILIZING  TRANSACTIONS,   IF
COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
    
 
                                       3
<PAGE>
                             AVAILABLE INFORMATION
 
   
    This  Prospectus constitutes a part of  a combined Registration Statement on
Form S-3 (together with all  amendments and exhibits thereto, the  "Registration
Statement")  filed  by  Sierra  Pacific  and  Sierra  Pacific  Capital  with the
Securities and Exchange Commission (the "SEC") under the Securities Act of 1933,
as amended (the  "Securities Act"), with  respect to the  Trust Securities,  the
Junior  Subordinated Debentures  and the  Guarantee (the  "Offered Securities").
This Prospectus  does not  contain all  of  the information  set forth  in  such
Registration  Statement, certain parts  of which are  omitted in accordance with
the rules and  regulations of the  SEC. Reference is  made to such  Registration
Statement  and to  the exhibits  relating thereto  for further  information with
respect to Sierra Pacific, the Sierra Pacific Trust and the Offered  Securities.
Any  statements contained herein concerning the provisions of any document filed
as an exhibit to the Registration Statement  or otherwise filed with the SEC  or
incorporated  by reference  herein are  not necessarily  complete, and,  in each
instance, reference is made  to the copy  of such document so  filed for a  more
complete description of the matter involved. Each such statement is qualified in
its entirety by such reference.
    
 
    Sierra   Pacific  is  subject  to  the  informational  requirements  of  the
Securities Exchange  Act  of 1934,  as  amended  (the "Exchange  Act"),  and  in
accordance   therewith  files  reports  and  other  information  with  the  SEC.
Information regarding  Sierra  Pacific's  directors, the  remuneration  paid  to
Sierra  Pacific's officers and directors, and interests of management and others
in certain transactions  with Sierra Pacific  is disclosed in  reports filed  by
Sierra  Pacific with the SEC. Sierra Pacific's parent, Sierra Pacific Resources,
is also subject to  the informational requirements of  the Exchange Act and,  in
accordance therewith, files reports, proxy statements and other information with
the SEC. Such reports, proxy statements and other information filed with the SEC
can  be inspected and copied  at prescribed rates at  the SEC's Public Reference
Room, Judiciary Plaza, 450 Fifth  Street, Northwest, Washington, D.C. 20549,  as
well  as the following  Regional Offices of  the SEC: 7  World Trade Center, New
York, New York 10048; and Northwestern  Atrium Center, 500 West Madison  Street,
Chicago, Illinois 60661.
 
    No  separate  financial  statements  of  Sierra  Pacific  Capital  have been
included herein. Sierra Pacific does not consider that such financial statements
would be material to holders of the Preferred Securities because (i) all of  the
voting  securities  of  Sierra  Pacific  Capital  will  be  owned,  directly  or
indirectly, by Sierra Pacific, a reporting company under the Exchange Act,  (ii)
Sierra  Pacific Capital  has no independent  operations but exists  for the sole
purpose of issuing securities representing undivided beneficial interests in the
assets of Sierra Pacific  Capital and investing the  proceeds thereof in  Junior
Subordinated  Debentures issued  by Sierra  Pacific, and  (iii) Sierra Pacific's
obligations described  herein  under the  Declaration  of Trust,  the  Guarantee
issued  with respect to Preferred Securities, the Junior Subordinated Debentures
and the Indenture  (as defined herein),  taken together, constitute  a full  and
unconditional   guarantee  of  payments   due  on  the   Trust  Securities.  See
"Description of  the Junior  Subordinated Debentures"  and "Description  of  the
Guarantee."
 
    Sierra Pacific Capital is not currently subject to the information reporting
requirements  of the Exchange Act. Sierra Pacific Capital will become subject to
such requirements upon the effectiveness of the Registration Statement, although
it intends to seek and expects to receive exemptions therefrom.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
   
    The following documents filed by Sierra  Pacific (File No. 1-8609) with  the
SEC  pursuant to the Exchange Act is incorporated by reference herein and made a
part hereof:
    
 
   
        1.  Annual Report  on Form 10-K  for the year  ended December 31,  1995,
    including the Form 10-K/A amendment thereto; and
    
 
   
        2.  Quarterly Report on Form 10-Q for the quarter ended March 31, 1996.
    
 
    All  documents filed by Sierra Pacific pursuant to Sections 13(a), 13(c), 14
or 15(d) of  the Exchange Act  subsequent to the  date hereof and  prior to  the
termination  of the offering of the  Offered Securities pursuant hereto shall be
deemed to be  incorporated by  reference in  this Prospectus  and to  be a  part
hereof from the date of filing of such documents.
 
                                       4
<PAGE>
    Any statement contained herein or in a document incorporated or deemed to be
incorporated  by reference herein  shall be deemed to  be modified or superseded
for purposes of this Prospectus to the extent that a statement contained  herein
or  therein (or  in any  other subsequently  filed document  that also  is or is
deemed to be incorporated by reference herein or therein) modifies or supersedes
such statement. Any  statement so modified  or superseded shall  not be  deemed,
except as so modified or superseded, to constitute a part of this Prospectus.
 
    Sierra Pacific undertakes to provide without charge to each person to whom a
copy  of this Prospectus has been delivered, upon the written or oral request of
any such person, a copy  of any or all  of the foregoing documents  incorporated
herein by reference, other than exhibits to such documents, unless such exhibits
are  specifically incorporated by  reference into such  documents. Such requests
should be directed to Treasurer, Sierra  Pacific Power Company, P.O. Box  10100,
Reno, Nevada 89520, Telephone (702) 689-4011.
 
                                       5
<PAGE>
                          SIERRA PACIFIC POWER COMPANY
                   SELECTED HISTORICAL FINANCIAL INFORMATION
 
    The  following  summary  information is  qualified  in its  entirety  by the
information appearing elsewhere in  this Prospectus and  by the information  and
financial  statements  in  the  documents  incorporated  by  reference  in  this
Prospectus.
 
<TABLE>
<S>                                            <C>
Business.....................................  Primarily  an  electric  utility  which  also
                                               provides  gas and water  service in a portion
                                               of its service area
Service Area.................................  Western, central and northeastern Nevada, and
                                               eastern California including  the Lake  Tahoe
                                               Area
12 Months Ended December 31, 1995:
    Customers................................  Electric 270,000; Gas 92,000; Water 61,000
    Revenue Distribution.....................  Electric 82%; Gas 11%; Water 7%
    Electric Power Sources...................  Purchased  Power 46%;  Coal 23%;  Oil and Gas
                                               30%; Hydro 1%
</TABLE>
 
                             FINANCIAL INFORMATION
                           (THOUSANDS, EXCEPT RATIOS)
 
   
<TABLE>
<CAPTION>
                                       THREE MONTHS                    YEAR ENDED DECEMBER 31,
                                          ENDED       ----------------------------------------------------------
                                      MARCH 31, 1996     1995        1994        1993        1992        1991
                                      --------------  ----------  ----------  ----------  ----------  ----------
<S>                                   <C>             <C>         <C>         <C>         <C>         <C>
Income Summary:
  Operating Revenues................    $  162,154    $  597,784  $  603,193  $  521,568  $  476,769  $  462,153
  Operating Income..................        28,665       101,811      95,983      90,562      84,823      86,330
  Interest Charges (Excluding
   AFUDC)...........................         9,672        37,107      41,027      40,914      40,392      43,362
  Net Income........................        20,114        65,983      60,863      57,457      49,843      50,224
  Preferred Stock Dividend
   Requirements.....................    $    1,785    $    7,374  $    7,934  $    8,261  $    5,640  $    4,361
  Ratio of Earnings to Fixed Charges
   (1):
    Actual..........................          3.71(2)       3.54        3.09        2.94        2.81        2.62
    Pro Forma.......................          3.50(2)
  Ratio of Earnings to Fixed Charges
   and Preferred Dividends (1):
    Actual..........................          2.88(2)       2.76        2.43        2.29        2.34        2.30
    Pro Forma.......................          2.90(2)
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                                        MARCH 31, 1996
                                                                   --------------------------------------------------------
                                                                             ACTUAL                   AS ADJUSTED (3)
                                                                   ---------------------------  ---------------------------
                                                                   OUTSTANDING    PERCENTAGE    OUTSTANDING    PERCENTAGE
                                                                   ------------  -------------  ------------  -------------
<S>                                                                <C>           <C>            <C>           <C>
Capitalization Summary:
Long-term debt (4)...............................................  $    562,877        45.9%    $    572,877        45.3%
Company-obligated mandatorily redeemable preferred securities of
 subsidiary Sierra Pacific Power Capital I (5)...................       --              0.0           48,500         3.8
Preferred Stock..................................................        73,115         6.0           73,115         5.8
Preferred Stock Subject to Mandatory Redemption (6)..............        20,400         1.6                          0.0
Common Shareholders' Equity......................................       570,712        46.5          570,712        45.1
                                                                   ------------       -----     ------------       -----
  Total..........................................................  $  1,227,104       100.0%    $  1,265,204       100.0%
                                                                   ------------       -----     ------------       -----
                                                                   ------------       -----     ------------       -----
Short-Term Debt..................................................  $     50,000                 $     11,900
</TABLE>
    
 
- ------------------------------
(1)  "Earnings" represent the aggregate of net income, including AFUDC, taxes on
     income and fixed charges. "Fixed charges" represent interest on  short-term
     and   long-term  debt,  the   interest  portion  on   capital  leases,  the
     amortization of bond premiums, discounts and expenses, and the amortization
     of the net gain or loss on reacquired debt.
 
                                       6
<PAGE>
   
(2)  The calculations  of  Ratio of  Earnings  to  Fixed Charges  and  Ratio  of
     Earnings to Fixed Charges and Preferred Dividends are for the twelve months
     ended  March 31,  1996. The  pro forma ratios  give effect  to the interest
     payable on the Junior Subordinated Debentures at an assumed annual rate  of
     8.5% and the application of the proceeds as described in "Use of Proceeds".
    
   
(3)  Also reflects the issuance on April 1, 1996 of $10,000,000 principal amount
     of Medium-Term Notes, Series C at an annual interest rate of 6.81%, the net
     proceeds  of which were  used to reduce short-term  debt of Sierra Pacific.
     Assumes that  the net  proceeds to  Sierra  Pacific from  the sale  of  the
     Preferred  Securities offered hereby will be  used to replace funds used to
     redeem $20,400,000 in principal amount of Series G 8.24% Preferred Stock of
     Sierra Pacific and to reduce short-term debt of Sierra Pacific.
    
   
(4)  Includes current maturities of long-term debt.
    
   
(5)  As described in this  Prospectus, all of  the assets of  the Trust will  be
        %  Junior  Subordinated Debentures  due 2036  of  Sierra Pacific  with a
     principal amount of approximately $50,000,000, and upon redemption of  such
     debt, the Preferred Securities will be mandatorily redeemable.
    
   
(6)  Includes current maturity of redeemable preferred stock.
    
 
                                       7
<PAGE>
                          SIERRA PACIFIC POWER COMPANY
 
    Sierra Pacific is a public utility company which is engaged primarily in the
generation,  purchase, transmission, distribution and sale of electric energy to
approximately 270,000 customers in a  service territory of approximately  50,000
square  miles located in western, central and northeastern Nevada, including the
cities of Reno, Sparks, Carson City and Elko, and eastern California,  including
the Lake Tahoe area. Sierra Pacific met its electric energy requirements for the
twelve  months  ended  December 31,  1995  by utilizing  coal  generation (23%),
gas/oil generation (30%),  purchased power  (46%) and hydro  power (1%).  Sierra
Pacific  has  no  ownership  interest  in,  nor  does  it  operate,  any nuclear
generating units and has no future plans to do so. Sierra Pacific also  provides
gas  and water service to approximately 92,000 gas and 61,000 water customers in
the cities of Reno and Sparks and environs.
 
   
    Sierra Pacific is  a subsidiary of  Sierra Pacific Resources  ("Resources"),
which  owns all  of Sierra  Pacific's outstanding  common stock.  In June, 1994,
Sierra Pacific, Resources and The Washington Water Power Company ("WWP") entered
into an Agreement and Plan of Reorganization and Merger, as subsequently amended
(the "Merger  Agreement"), which  provides  for the  merger of  Sierra  Pacific,
Resources  and WWP into Altus Corporation  ("Altus"). WWP is a combined electric
and gas utility, with headquarters in Spokane, Washington. The Merger  Agreement
provides  that  after  the  effective  date  of  the  merger,  Altus's corporate
headquarters will be located  in Spokane. The executive  offices of the  Company
will  be distributed among lines of business  located in Reno and Spokane. Altus
will maintain a significant corporate presence  in Reno. Pursuant to the  Merger
Agreement,  holders of  Resources's Common Stock  would receive  1.44 shares and
holders of  WWP Common  Stock would  receive one  share of  Altus Common  Stock,
respectively.   Upon  consummation  of  the   Merger,  the  Junior  Subordinated
Debentures and the Guarantee will be assumed by, and the Common Securities  will
be  held  directly  or indirectly  by,  Altus. Pro  forma  financial information
showing the effect of the Merger as of certain dates has been included in Sierra
Pacific's periodic reports filed pursuant to the Exchange Act.
    
 
   
    The proposed merger  has received all  of the necessary  approvals from  the
common  and preferred  shareholders of  Resources, Sierra  Pacific and  WWP. The
Merger Agreement is also subject to certain customary closing conditions and  to
the  receipt of all necessary governmental  approvals, including approval of the
Federal Energy Regulatory Commission ("FERC") and six state utility commissions.
The state commissions in California,  Idaho, Nevada, Oregon and Washington  have
issued  orders  approving the  merger, and  the  Montana utility  commission has
issued an  order  stating that  it  would  not exercise  jurisdiction  over  the
proposed  merger. Stipulations were reached among  all parties in the states and
final orders approving the merger were issued. The stipulations contain a number
of provisions specific to individual states; however, all provide that  existing
jurisdictional  customers  be  held  harmless  from  the  merger  and  all state
commissions can reopen the proceedings after the FERC order if warranted.
    
 
   
    The merger parties must still obtain approval for the merger from the  FERC.
On  November  29, 1995,  the  FERC issued  an  "Order Accepting  for  Filing and
Suspending Proposed  Tariffs,  Consolidating Dockets  and  Establishing  Hearing
Procedures"  for  the merger.  Among other  things,  the Order  consolidated the
transmission tariffs and the  merger application for  purposes of the  hearings.
Additionally,  an updated, revised filing  as required by the  Order was made on
February 1, 1996,  and hearings are  scheduled to commence  in June 1996.  Based
upon  this schedule, the  parties believe that  an order could  be issued by the
FERC in 1996 or early 1997. However, under federal law, the FERC is not required
to issue a decision within any particular time period.
    
 
   
    In the event that the merger is not completed, Sierra Pacific would continue
to operate as a stand-alone utility owned by Resources. However, Sierra  Pacific
would  need  to  reach alternative  arrangements  with each  of  its Commissions
(Nevada and California),  either through negotiations  or new rate  proceedings,
with  respect to rates to customers and rates of return as a stand-alone entity.
No assurance can be given as to the results of such negotiations or  proceedings
or as to their impact on Sierra Pacific's revenues and net income going forward.
The  Merger Agreement provides for the payment  of a $25 million termination fee
plus expenses  to be  made  in certain  circumstances  where one  party  accepts
another  business combination proposal and, as a result, the Merger Agreement is
terminated. Also,  the  Merger Agreement  provides  that the  agreement  may  be
terminated  at any time prior to the closing  date if the effective time has not
occurred before June 27, 1996, by providing written notice of termination to the
other party.
    
 
    The principal executive offices of Sierra  Pacific are located at 6100  Neil
Road, P.O. Box 10100, Reno, Nevada 89520, telephone (702) 689-4011.
 
                                       8
<PAGE>
                         SIERRA PACIFIC POWER CAPITAL I
 
    Sierra  Pacific Capital is a statutory  business trust formed under Delaware
law pursuant to (i) a declaration of trust, dated as of April 23, 1996, executed
by Sierra Pacific, as sponsor of the Trust (the "Sponsor"), and the trustees  of
Sierra  Pacific Capital (the "Sierra Pacific Trustees") and (ii) the filing of a
certificate of trust with  the Secretary of  State of the  State of Delaware  on
April  23, 1996. Such declaration  will be amended and  restated in its entirety
(as so amended and restated, the "Declaration") substantially in the form  filed
as  an exhibit to the Registration  Statement. The Declaration will be qualified
as an indenture under the  Trust Indenture Act of  1939, as amended (the  "Trust
Indenture  Act").  Upon issuance  of  the Preferred  Securities,  the purchasers
thereof will  own all  of  the Preferred  Securities.  See "Description  of  the
Preferred  Securities  --  Book-Entry  Only  Issuance  --  The  Depository Trust
Company." Sierra Pacific will directly  or indirectly acquire Common  Securities
in  an aggregate liquidation amount  equal to 3% of  the total capital of Sierra
Pacific Capital. Sierra Pacific Capital exists for the exclusive purposes of (i)
issuing the Trust Securities representing undivided beneficial interests in  the
assets  of the Trust, (ii) investing the  gross proceeds of the Trust Securities
in the Junior  Subordinated Debentures and  (iii) engaging in  only those  other
activities necessary or incidental thereto.
 
    Pursuant  to the  Declaration, the  number of  Sierra Pacific  Trustees will
initially be four. Two of the  Sierra Pacific Trustees (the "Regular  Trustees")
will  be persons  who are employees  or officers  of or who  are affiliated with
Sierra Pacific.  The third  trustee  will be  a  financial institution  that  is
unaffiliated  with  Sierra Pacific,  which trustee  will serve  as institutional
trustee under  the Declaration  and as  indenture trustee  for the  purposes  of
compliance  with the provisions  of the Trust  Indenture Act (the "Institutional
Trustee"). Initially, IBJ  Schroder Bank  & Trust  Company, a  New York  banking
corporation,  will be the Institutional Trustee until removed or replaced by the
holder of  the  Common  Securities.  For the  purpose  of  compliance  with  the
provisions  of the Trust Indenture  Act, IBJ Schroder Bank  & Trust Company will
act as trustee (the "Guarantee Trustee") under the Guarantee and as Debt Trustee
(as defined herein) under  the Indenture. The fourth  trustee will be an  entity
that  maintains its principal  place of business  in the state  of Delaware (the
"Delaware Trustee"). Initially, Delaware Trust Capital Management, Inc. will act
as Delaware Trustee. See "Description of the Guarantee" and "Description of  the
Preferred Securities -- Voting Rights."
 
    The  Institutional  Trustee  will  hold  title  to  the  Junior Subordinated
Debentures for  the benefit  of the  holders of  the Trust  Securities, and  the
Institutional  Trustee will  have the power  to exercise all  rights, powers and
privileges under the Indenture (as defined  herein) as the holder of the  Junior
Subordinated  Debentures. In  addition, the Institutional  Trustee will maintain
exclusive control  of  a  segregated  non-interest  bearing  bank  account  (the
"Property  Account")  to  hold  all  payments  made  in  respect  of  the Junior
Subordinated Debentures for the benefit of the holders of the Trust  Securities.
The  Institutional Trustee will  make payments of  distributions and payments on
liquidation, redemption and otherwise to the holders of the Trust Securities out
of funds  from  the  Property  Account. The  Guarantee  Trustee  will  hold  the
Guarantee  for the  benefit of the  holders of the  Preferred Securities. Sierra
Pacific, as the  direct or indirect  holder of all  the Common Securities,  will
have  the right to appoint, remove or  replace any Sierra Pacific Trustee and to
increase or decrease the number of Sierra Pacific Trustees. Sierra Pacific  will
pay  all fees and expenses related to Sierra Pacific Capital and the offering of
the Trust Securities. See "Description of the Junior Subordinated Debentures  --
Miscellaneous."
 
    The  rights of the  holders of the  Preferred Securities, including economic
rights,  rights  to  information  and  voting  rights,  are  set  forth  in  the
Declaration,  the Delaware  Business Trust Act  (the "Trust Act")  and the Trust
Indenture Act. See "Description of the Preferred Securities."
 
                                       9
<PAGE>
                                  RISK FACTORS
 
    Prospective  purchasers of Preferred Securities  should carefully review the
information contained  elsewhere  in  this Prospectus  and  should  particularly
consider the following matters.
 
ABSENCE OF PRIOR PUBLIC MARKET
 
    Prior  to this offering, there  has been no public  market for the Preferred
Securities. Although application has been made to list the Preferred  Securities
on the NYSE, there can be no assurance that an active public market will develop
for  the Preferred Securities or that, if such market develops, the market price
will equal or exceed the  public offering price set forth  on the cover page  of
this Prospectus. The public offering price for the Preferred Securities has been
determined  through negotiations  between Sierra  Pacific and  the Underwriters.
Prices for the Preferred  Securities will be determined  in the marketplace  and
may be influenced by many factors, including the liquidity of the market for the
Preferred  Securities,  investor  perceptions  of  Sierra  Pacific  and  general
industry and economic conditions.
 
RANKING OF SUBORDINATE OBLIGATIONS UNDER THE GUARANTEE, AND JUNIOR SUBORDINATED
DEBENTURES
 
    Sierra Pacific's obligations under the Guarantee are subordinate and  junior
in right of payment to all liabilities of Sierra Pacific and PARI PASSU with the
most  senior  preferred stock  issued,  from time  to  time, if  any,  by Sierra
Pacific. The  obligations  of  Sierra  Pacific  under  the  Junior  Subordinated
Debentures  are subordinate and  junior in right  of payment to  all present and
future Senior Indebtedness of Sierra Pacific and PARI PASSU with obligations  to
or  rights of Sierra Pacific's other  general unsecured creditors. No payment of
principal of  (including  redemption payments,  if  any), premium,  if  any,  or
interest  on the Junior  Subordinated Debentures may  be made if  (i) any Senior
Indebtedness of Sierra  Pacific is not  paid when due  and any applicable  grace
period  with respect to such default has ended with such default not having been
cured or  waived  or ceasing  to  exist, or  (ii)  the maturity  of  any  Senior
Indebtedness has been accelerated because of a default. As of December 31, 1995,
Senior  Indebtedness aggregated approximately $463 million, substantially all of
which consists of first mortgage bonds  or debt secured by first mortgage  bonds
issued  under Sierra Pacific's Indenture of Mortgage dated December 1, 1940, and
which are secured by a first lien on substantially all of Sierra Pacific's  real
and  personal  property. There  are no  terms in  the Preferred  Securities, the
Junior Subordinated  Debentures or  the Guarantee  that limit  Sierra  Pacific's
ability  to  incur additional  indebtedness,  including indebtedness  that ranks
senior to the Junior Subordinated Debentures and the Guarantee. See "Description
of the Guarantee  -- Status  of the Guarantee"  and "Description  of the  Junior
Subordinated Debentures" herein.
 
RIGHTS UNDER THE GUARANTEE
 
    The  Guarantee will be  qualified as an indenture  under the Trust Indenture
Act. IBJ Schroder Bank & Trust Company  will act as indenture trustee under  the
Guarantee  for  the purposes  of  compliance with  the  provisions of  the Trust
Indenture Act (the  "Guarantee Trustee").  The Guarantee Trustee  will hold  the
Guarantee for the benefit of the holders of the Preferred Securities.
 
    The  Guarantee guarantees  to the  holders of  the Preferred  Securities the
payment of (i) any accrued and unpaid distributions that are required to be paid
on the  Preferred  Securities, to  the  extent  the Trust  has  funds  available
therefor,   (ii)  the  Redemption  Price,   including  all  accrued  and  unpaid
distributions with respect to Preferred Securities called for redemption by  the
Trust,  to the extent the  Trust has funds available  therefor, and (iii) upon a
voluntary or involuntary  dissolution, winding-up  or termination  of the  Trust
(other   than  in  connection  with  the  distribution  of  Junior  Subordinated
Debentures to the  holders of Preferred  Securities or a  redemption of all  the
Preferred Securities), the lesser of (a) the aggregate of the liquidation amount
and all accrued and unpaid distributions on the Preferred Securities to the date
of  the payment to the extent the Trust  has funds available therefor or (b) the
amount of assets of the Trust remaining available for distribution to holders of
the Preferred Securities in liquidation of the Trust. The holders of a  majority
in  liquidation amount of the Preferred Securities  have the right to direct the
time, method and place of conducting any proceeding for any remedy available  to
the  Guarantee Trustee or to direct the exercise of any trust or power conferred
upon the Guarantee Trustee under  the Guarantee. Notwithstanding the  foregoing,
any  holder of  Preferred Securities may  institute a  legal proceeding directly
against Sierra Pacific to enforce such  holder's right to receive payment  under
the  Guarantee without first  instituting a legal  proceeding against the Trust,
 
                                       10
<PAGE>
the Guarantee Trustee or any other person  or entity. If Sierra Pacific were  to
default  on its  obligation to  pay amounts  payable on  the Junior Subordinated
Debentures or otherwise, the Trust would lack available funds for the payment of
distributions or amounts payable  on redemption of  the Preferred Securities  or
otherwise,  and, in such event, holders of the Preferred Securities would not be
able to rely upon the Guarantee for payment of such amounts. Instead, holders of
the Preferred Securities would rely on the enforcement (1) by the  Institutional
Trustee of its rights as registered holder of the Junior Subordinated Debentures
against  Sierra  Pacific  pursuant  to  the  terms  of  the  Junior Subordinated
Debentures or (2) by such holder of its right against Sierra Pacific to  enforce
payments  on  the  Junior  Subordinated  Debentures.  See  "Description  of  the
Guarantee"  and  "Description  of  the  Junior  Subordinated  Debentures."   The
Declaration  provides that  each holder  of Preferred  Securities, by acceptance
thereof, agrees to the provisions of the Guarantee, including the  subordination
provisions thereof, and the Indenture.
 
ENFORCEMENT OF CERTAIN RIGHTS BY HOLDERS OF PREFERRED SECURITIES
 
    If  a  Declaration  Event  of  Default (as  defined  herein)  occurs  and is
continuing,  then  the  holders  of  Preferred  Securities  would  rely  on  the
enforcement by the Institutional Trustee of its rights as a holder of the Junior
Subordinated  Debentures against Sierra  Pacific. In addition,  the holders of a
majority in liquidation amount of the  Preferred Securities will have the  right
to  direct the  time, method,  and place  of conducting  any proceeding  for any
remedy available to the Institutional Trustee  or to direct the exercise of  any
trust  or power conferred upon the  Institutional Trustee under the Declaration,
including the right to direct the Institutional Trustee to exercise the remedies
available to  it as  a holder  of  the Junior  Subordinated Debentures.  If  the
Institutional  Trustee fails to enforce its rights under the Junior Subordinated
Debentures, a holder of  Preferred Securities may  institute a legal  proceeding
directly  against Sierra Pacific  to enforce the  Institutional Trustee's rights
under the Junior  Subordinated Debentures  without first  instituting any  legal
proceeding  against the  Institutional Trustee  or any  other person  or entity.
Notwithstanding the foregoing, if  a Declaration Event  of Default has  occurred
and  is  continuing and  such event  is  attributable to  the failure  of Sierra
Pacific to pay interest  or principal on the  Junior Subordinated Debentures  on
the  date such  interest or principal  is otherwise  payable (or in  the case of
redemption, on the redemption date), then  a holder of Preferred Securities  may
directly institute a proceeding for enforcement of payment to such holder of the
principal  of  or  interest  on  the  Junior  Subordinated  Debentures  having a
principal amount  equal to  the aggregate  liquidation amount  of the  Preferred
Securities  of such holder (  a "Direct Action") on  or after the respective due
date specified in the  Junior Subordinated Debentures.  In connection with  such
Direct Action, Sierra Pacific will be subrogated to the rights of such holder of
Preferred  Securities under the Declaration to the extent of any payment made by
Sierra Pacific to such holder of Preferred Securities in such Direct Action. The
holders of Preferred Securities will not be able to exercise directly any  other
remedy  available  to the  holders of  the  Junior Subordinated  Debentures. See
"Description of the  Preferred Securities  -- Enforcement of  Certain Rights  by
Holders of Preferred Securities" and "-- Declaration Events of Default."
 
OPTION TO EXTEND INTEREST PAYMENT PERIOD
 
   
    Sierra Pacific has the right under the Indenture (as such term is defined in
"Description  of Junior  Subordinated Debentures"  herein) to  defer payments of
interest on the Junior Subordinated Debentures by extending the interest payment
period at  any  time,  and  from  time  to  time,  on  the  Junior  Subordinated
Debentures.  As a consequence  of such an  extension, quarterly distributions on
the Preferred  Securities would  be deferred  (but despite  such deferral  would
continue  to accrue  with interest  thereon compounded  quarterly to  the extent
permitted by applicable  law) by  the Trust  during any  such extended  interest
payment  period. Such right to extend the interest payment period for the Junior
Subordinated Debentures  is limited  to a  period not  exceeding 20  consecutive
quarters.  In  the  event that  Sierra  Pacific  exercises this  right  to defer
interest payments, then (a)  Sierra Pacific shall not  declare or pay  dividends
on,  or make a distribution with respect  to, or redeem, purchase or acquire, or
make a liquidation payment with respect to, any of its capital stock (other than
(i) purchases  or acquisitions  of  shares of  Sierra  Pacific Common  Stock  in
connection  with the satisfaction by Sierra Pacific of its obligations under any
employee benefit plans, (ii) as a result of a reclassification of Sierra Pacific
capital stock or the  exchange or conversion  of one class  or series of  Sierra
Pacific's  capital stock for  another class or series  of Sierra Pacific capital
stock or  (iii)  the  purchase  of fractional  interests  in  shares  of  Sierra
Pacific's    capital   stock   pursuant   to    the   conversion   or   exchange
    
 
                                       11
<PAGE>
provisions of such Sierra Pacific capital stock or the security being  converted
or  exchanged),  (b) Sierra  Pacific  shall not  make  any payment  of interest,
principal or  premium,  if any,  on  or repay,  repurchase  or redeem  any  debt
securities  issued by Sierra Pacific that rank  PARI PASSU with or junior to the
Junior Subordinated  Debentures  and  (c)  Sierra Pacific  shall  not  make  any
guarantee  payments with  respect to the  foregoing (other than  pursuant to the
Guarantee). Prior  to  the termination  of  any such  extension  period,  Sierra
Pacific  may further  extend the  interest payment  period; PROVIDED,  that such
Extension Period,  together  with  all  such  previous  and  further  extensions
thereof, may not exceed 20 consecutive quarters or extend beyond the maturity of
the Junior Subordinated Debentures. Upon the termination of any Extension Period
and  the payment  of all  amounts then  due, Sierra  Pacific may  commence a new
Extension Period, subject  to the  above requirements. See  "Description of  the
Preferred   Securities  --   Distributions"  and  "Description   of  the  Junior
Subordinated Debentures -- Option to Extend Interest Payment Period."
 
    Should Sierra Pacific exercise  its right to defer  payments of interest  by
extending  the interest payment period, each holder of Preferred Securities will
continue to accrue income (as original issue discount ("OID")) in respect of the
deferred interest  allocable  to  its Preferred  Securities  for  United  States
federal  income tax  purposes, which will  be allocated but  not distributed, to
holders of record  of Preferred  Securities. As a  result, each  such holder  of
Preferred  Securities will recognize income for United States federal income tax
purposes in advance of the  receipt of cash and will  not receive the cash  from
Sierra  Pacific Capital related  to such income  if such holder  disposes of its
Preferred  Securities  prior  to  the  record   date  for  the  date  on   which
distributions  of such amounts are made. Sierra Pacific has no current intention
of exercising its right to defer payments of interest by extending the  interest
payment  period on  the Junior  Subordinated Debentures.  However, should Sierra
Pacific determine to exercise such right in the future, the market price of  the
Preferred  Securities is likely  to be affected.  A holder that  disposes of its
Preferred Securities during  an Extension Period,  therefore, might not  receive
the  same  return on  its  investment as  a holder  that  continues to  hold its
Preferred Securities.  In addition,  as  a result  of  the existence  of  Sierra
Pacific's  right to defer  interest payments, the market  price of the Preferred
Securities (which  represent  an undivided  beneficial  interest in  the  Junior
Subordinated Debentures) may be more volatile than other securities on which OID
accrues that do not have such rights. See "United States Federal Income Taxation
- -- Original Issue Discount."
 
PROPOSED TAX LEGISLATION
 
    On  March 19, 1996, President Clinton  proposed certain tax law changes that
would, among  other things,  generally deny  corporate issuers  a deduction  for
interest  in respect of certain debt obligations  issued on or after December 7,
1995 (the "Proposed Legislation") if such  debt obligations have a maximum  term
in  excess of  twenty years and  are not  shown as indebtedness  on the issuer's
applicable consolidated balance  sheet. On  March 29, 1996,  the Senate  Finance
Committee  Chairman and  the House  Ways and  Means Committee  Chairman issued a
joint statement (the  "Joint Statement")  indicating their  intent that  certain
legislative  proposals initiated  by the  Clinton administration,  including the
Proposed  Legislation,  that  may  be  adopted  by  either  of  the  tax-writing
committees  of Congress would have an effective date that is no earlier than the
date of "appropriate Congressional action."  Based upon the Joint Statement,  it
is  expected  that  if  the  Proposed  Legislation  were  to  be  enacted,  such
legislation would not apply to the Junior Subordinated Debentures. There can  be
no  assurances, however, that the effective date guidance contained in the Joint
Statement will be  incorporated into  the Proposed Legislation,  if enacted,  or
that  other  legislation  enacted  after  the  date  hereof  will  not otherwise
adversely affect the ability of Sierra Pacific to deduct the interest payable on
the Junior Subordinated Debentures. Accordingly, there can be no assurance  that
a  Tax Event will not occur. See "Description of the Preferred Securities -- Tax
Event Redemption or Distribution."
 
TAX EVENT REDEMPTION OR DISTRIBUTION
 
    Upon the occurrence of a Tax Event, the Trust shall be dissolved, except  in
the  limited  circumstance  described below,  with  the result  that  the Junior
Subordinated Debentures  would  be  distributed  to the  holders  of  the  Trust
Securities  in  connection  with  the  liquidation  of  the  Trust.  In  certain
circumstances, Sierra  Pacific  shall  have  the  right  to  redeem  the  Junior
Subordinated  Debentures, in whole or in part,  in lieu of a distribution of the
Junior Subordinated  Debentures by  the Trust;  in which  event the  Trust  will
redeem
 
                                       12
<PAGE>
the  Trust Securities  on a  PRO RATA  basis to  the same  extent as  the Junior
Subordinated Debentures are redeemed by Sierra Pacific. See "Description of  the
Preferred Securities -- Tax Event Redemption or Distribution."
 
    Under current United States federal income tax law, a distribution of Junior
Subordinated Debentures upon the dissolution of the Trust would not be a taxable
event  to holders of the  Preferred Securities. Upon occurrence  of a Tax Event,
however, a dissolution of the Trust in which holders of the Preferred Securities
receive cash  would be  a taxable  event  to such  holders. See  "United  States
Federal  Income Taxation  -- Receipt of  Junior Subordinated  Debentures or Cash
Upon Liquidation of Sierra Pacific Power Capital I."
 
    There can  be  no  assurance as  to  the  market prices  for  the  Preferred
Securities  or the  Junior Subordinated  Debentures that  may be  distributed in
exchange for Preferred Securities if a  dissolution or liquidation of the  Trust
were  to  occur.  Accordingly, the  Preferred  Securities that  an  investor may
purchase, whether pursuant to the offer made hereby or in the secondary  market,
or  the Junior Subordinated Debentures that a holder of Preferred Securities may
receive on dissolution and liquidation of the Trust, may trade at a discount  to
the  price that the  investor paid to purchase  the Preferred Securities offered
hereby. Because holders of Preferred Securities may receive Junior  Subordinated
Debentures  upon  the  occurrence  of a  Tax  Event,  prospective  purchasers of
Preferred Securities are also making an  investment decision with regard to  the
Junior  Subordinated Debentures and should  carefully review all the information
regarding the Junior Subordinated Debentures contained herein. See  "Description
of  the  Preferred  Securities  -- Tax  Event  Redemption  or  Distribution" and
"Description of the Junior Subordinated Debentures -- General."
 
LIMITED VOTING RIGHTS
 
    Holders of Preferred Securities will have limited voting rights and will not
be entitled to vote to  appoint, remove or replace,  or to increase or  decrease
the  number  of,  Sierra  Pacific  Trustees,  which  voting  rights  are  vested
exclusively in  the  holder  of  the  Common  Securities.  See  "Description  of
Preferred Securities -- Voting Rights."
 
TRADING PRICE
 
    The  Preferred Securities may trade  at a price that  does not fully reflect
the value of accrued but unpaid  interest with respect to the underlying  Junior
Subordinated  Debentures.  A holder  who  disposes of  his  Preferred Securities
between record dates for payments of  distributions thereon will be required  to
include  accrued  but  unpaid  interest on  the  Junior  Subordinated Debentures
through the date of disposition in income as ordinary income (i.e., OID), and to
add such  amount  to his  adjusted  tax  basis in  his  PRO RATA  share  of  the
underlying  Junior Subordinated Debentures deemed disposed of. To the extent the
selling price is less than the holder's adjusted tax basis (which will  include,
in  the form of OID, all accrued but unpaid interest), a holder will recognize a
capital loss. Subject to  certain limited exceptions,  capital losses cannot  be
applied to offset ordinary income for United States federal income tax purposes.
See  "United  States Federal  Income Taxation  --  Original Issue  Discount" and
"Sales of Preferred Securities."
 
                              ACCOUNTING TREATMENT
 
   
    The financial statements of the Trust will be reflected in Sierra  Pacific's
consolidated  financial  statements  with  the  Preferred  Securities  shown  as
Company-obligated mandatorily-redeemable preferred securities of the  subsidiary
Trust holding solely $48,500,000 principal amount of   % subordinated debentures
due 2036 of Sierra Pacific.
    
 
                                USE OF PROCEEDS
 
   
    The  Trust  will  use  all  proceeds received  from  the  sale  of Preferred
Securities to  purchase  Junior  Subordinated Debentures  from  Sierra  Pacific.
Sierra  Pacific intends  to use  the net  proceeds from  the sale  of the Junior
Subordinated Debentures to replace funds used to redeem $20,400,000 in principal
amount of 8.24%  Sierra Pacific Power  Company Series G  Preferred Stock and  to
reduce  short-term debt. As of March  31, 1996, the total outstanding short-term
debt of Sierra Pacific was $50,000,000 with an average interest rate of 5.73%
    
 
                                       13
<PAGE>
                    DESCRIPTION OF THE PREFERRED SECURITIES
 
   
    The Preferred  Securities  will be  issued  pursuant  to the  terms  of  the
Declaration.  The Declaration will be qualified  as an indenture under the Trust
Indenture Act. The  Institutional Trustee,  IBJ Schroder Bank  & Trust  Company,
will act as indenture trustee for the Preferred Securities under the Declaration
for  purposes of compliance with the provisions  of the Trust Indenture Act. The
terms of the Preferred Securities will  include those stated in the  Declaration
and  those made  part of  the Declaration  by the  Trust Indenture  Act and will
mirror the terms  of the  Junior Subordinated Debentures  held by  the Trust  as
described  herein. See "Description of  the Junior Subordinated Debentures." All
Preferred Securities offered hereby will be fully and unconditionally guaranteed
by Sierra Pacific. See "Description of Guarantee." The following summary of  the
material terms and provisions of the Preferred Securities does not purport to be
complete  and is subject to, and qualified  in its entirety by reference to, the
Declaration, a  copy  of  which is  filed  as  an exhibit  to  the  Registration
Statement  of  which this  Prospectus is  a part,  the Trust  Act and  the Trust
Indenture Act.
    
 
GENERAL
 
   
    The Declaration authorizes the  Regular Trustees to issue  on behalf of  the
Trust  the Trust Securities,  which represent undivided  beneficial interests in
the  assets  of  the  Trust.  In  connection  with  the  issuance  of  Preferred
Securities,  the Trust will  issue one series of  Trust Common Securities having
such terms including distributions, redemption, voting and liquidation rights or
such restrictions  as  shall be  set  forth therein.  The  terms of  the  Common
Securities  will  be  substantially  identical to  the  terms  of  the Preferred
Securities and the Common Securities will rank PARI PASSU, and payments will  be
made  thereon PRO RATA, with the Preferred Securities except that, upon an event
of default  under the  Declaration, the  rights  of the  holders of  the  Common
Securities to payment in respect of distributions and payments upon liquidation,
redemption  and otherwise will be  subordinated to the rights  of the holders of
the Preferred Securities.  Except in certain  limited circumstances, the  Common
Securities  will also carry the right to  vote to appoint, remove or replace any
of the Sierra  Pacific Trustees  of Sierra Pacific  Capital. All  of the  Common
Securities  of Sierra  Pacific Capital will  be directly or  indirectly owned by
Sierra Pacific.
    
 
   
    The Declaration does not permit the issuance by the Trust of any  securities
other  than the Trust  Securities or the  incurrence of any  indebtedness by the
Trust. Pursuant  to the  Declaration,  the Institutional  Trustee will  own  the
Junior  Subordinated Debentures  purchased by the  Trust for the  benefit of the
holders of the Trust Securities. The payment of distributions out of money  held
by  the  Trust, and  payments  upon redemption  of  the Preferred  Securities or
liquidation of the  Trust, are  fully and unconditionally  guaranteed by  Sierra
Pacific.  See "Description of the Guarantee." The  Guarantee will be held by IBJ
Schroder Bank &  Trust Company, the  Guarantee Trustee, for  the benefit of  the
holders  of the  Preferred Securities. The  Guarantee does not  cover payment of
distributions when Sierra  Pacific Capital  does not  have sufficient  available
funds  to  pay such  distributions. In  such event,  the remedy  of a  holder of
Preferred Securities is to vote to  direct the Institutional Trustee to  enforce
the  Institutional  Trustee's rights  under  the Junior  Subordinated Debentures
except in the limited circumstances in which the holder may take Direct  Action.
See "Description of the Preferred Securities -- Enforcement of Certain Rights by
Holders  of Preferred Securities," "-- Voting Rights" and "-- Declaration Events
of Default."
    
 
DISTRIBUTIONS
 
    Distributions on the Preferred Securities will be fixed at a rate per  annum
of      %  of the  stated  liquidation  amount of  $25  per  Preferred Security.
Distributions in arrears for more than one quarter will bear interest thereon at
the rate per annum of   % thereof compounded quarterly (to the extent  permitted
by  applicable law).  The term "distribution"  as used herein  includes any such
interest payable unless  otherwise stated. The  amount of distributions  payable
for  any period will be computed on the basis of a 360-day year of twelve 30-day
months.
 
   
    Distributions on the  Preferred Securities will  be cumulative, will  accrue
from  June   , 1996, and will be  payable quarterly in arrears on March 31, June
30, September 30 and  December 31 of each  year, commencing September 30,  1996,
when,  as  and if  available  for payment,  distributions  will be  made  by the
Institutional Trustee, except as otherwise described below. Interest payable  in
the first payment period will be computed on the basis of   days.
    
 
                                       14
<PAGE>
    Sierra  Pacific  has the  right  under the  Indenture  to defer  payments of
interest on the Junior Subordinated Debentures by extending the interest payment
period from  time to  time  on the  Junior  Subordinated Debentures,  which,  if
exercised,  would  defer  quarterly distributions  on  the  Preferred Securities
(though such distributions would continue to accrue with interest since interest
would continue to accrue on the Junior Subordinated Debentures) during any  such
extended  interest payment  period. Such  right to  extend the  interest payment
period for  the  Junior Subordinated  Debentures  is  limited to  a  period  not
exceeding  20 consecutive  quarters provided that  such deferral  period may not
extend beyond the maturity of the  Junior Subordinated Debentures. In the  event
that  Sierra Pacific  exercises this  right, then  (a) Sierra  Pacific shall not
declare or pay  dividends on,  make distributions  with respect  to, or  redeem,
purchase  or acquire, or make a liquidation  payment with respect to, any of its
capital stock (other  than (i)  purchases or  acquisitions of  shares of  Sierra
Pacific  Common Stock in  connection with the satisfaction  by Sierra Pacific of
its obligations  under  any  employee benefit  plans,  (ii)  as a  result  of  a
reclassification  of Sierra Pacific capital stock  or the exchange or conversion
of one class or series  of Sierra Pacific's capital  stock for another class  or
series  of  Sierra Pacific  capital stock  or (iii)  the purchase  of fractional
interests in shares of Sierra Pacific's capital stock pursuant to the conversion
or exchange provisions  of such  Sierra Pacific  capital stock  or the  security
being converted or exchanged) or make any guarantee payments with respect to the
foregoing,  (b) Sierra Pacific shall not make any payment of interest, principal
or premium, if any, on or repay, repurchase or redeem any debt securities issued
by  Sierra  Pacific  that  rank  PARI  PASSU  with  or  junior  to  such  Junior
Subordinated  Debentures and  (c) Sierra  Pacific shall  not make  any guarantee
payments with respect to the foregoing  (other than pursuant to the  Guarantee).
Prior  to  the termination  of  any such  Extension  Period, Sierra  Pacific may
further extend  the  interest  payment period;  PROVIDED,  that  such  Extension
Period,  together with all such previous and further extensions thereof, may not
exceed 20  consecutive quarters  or extend  beyond the  maturity of  the  Junior
Subordinated  Debentures. Upon the  termination of any  Extension Period and the
payment of  all amounts  then due,  Sierra Pacific  may select  a new  Extension
Period,  subject  to  the above  requirements.  See "Description  of  the Junior
Subordinated Debentures -- Interest" and  "-- Option to Extend Interest  Payment
Period."  If distributions are deferred,  the deferred distributions and accrued
interest thereon shall be paid to holders of record of the Preferred  Securities
as  they appear on the books and records of Sierra Pacific Capital on the record
date next following the termination of such deferral period.
 
   
    Distributions on the Preferred Securities must be paid on the dates  payable
to  the  extent that  the  Trust has  funds available  for  the payment  of such
distributions  in  the  Property  Account.  The  Trust's  funds  available   for
distribution  to  the holders  of the  Preferred Securities  will be  limited to
payments received from Sierra Pacific on the Junior Subordinated Debentures. See
"Description  of   the  Junior   Subordinated   Debentures."  The   payment   of
distributions  out  of moneys  held by  the Trust  is fully  and unconditionally
guaranteed by Sierra Pacific. See "Description of the Guarantee."
    
 
   
    Distributions on the  Preferred Securities  will be payable  to the  holders
thereof  as they appear  on the books and  records of the  Trust on the relevant
record dates, which, as  long as the Preferred  Securities remain in  book-entry
only  form, will be  one Business Day  (as defined below)  prior to the relevant
payment dates. Such distributions will be paid through the Institutional Trustee
who will hold amounts received in respect of the Junior Subordinated  Debentures
in  the Property Account for the benefit of the holders of the Trust Securities.
Subject to  any  applicable laws  and  regulations  and the  provisions  of  the
Declaration,  each such payment will be made as described under "Book-Entry Only
Issuance -- The Depository Trust Company" below. In the event that the Preferred
Securities do  not continue  to  remain in  book-entry  only form,  the  Regular
Trustees  shall have the right  to select relevant record  dates, which shall be
more than one Business  Day prior to  the relevant payment  dates. In the  event
that  any date on which distributions are to be made on the Preferred Securities
is not a Business Day,  then payment of the  distributions payable on such  date
will be made on the next succeeding day which is a Business Day (and without any
interest  or other payment in  respect of any such  delay), except that, if such
Business Day is in the next succeeding calendar year, such payment shall be made
on the immediately preceding Business Day, in each case with the same force  and
effect as if made on such record date. A "Business Day" shall mean any day other
than Saturday, Sunday or any other day on which banking institutions in New York
City  (in the State of New York) are permitted or required by any applicable law
to close.
    
 
                                       15
<PAGE>
MANDATORY REDEMPTION
 
    The Junior Subordinated Debentures will mature on            , 2036, and may
be redeemed, in whole or in part, at any time on or after            , 2001,  or
at  any time in certain  circumstances upon the occurrence  of a Tax Event. Upon
the repayment of the Junior Subordinated Debentures, whether at maturity or upon
redemption, the proceeds from such repayment or payment shall simultaneously  be
applied  to redeem Trust Securities having an aggregate liquidation amount equal
to the  aggregate principal  amount  of the  Junior Subordinated  Debentures  so
repaid  or redeemed  at the  Redemption Price;  PROVIDED, that  holders of Trust
Securities shall be given not less than 30 nor more than 60 days' notice of such
redemption. See "Description of the  Junior Subordinated Debentures --  Optional
Redemption."  In  the event  that fewer  than all  of the  outstanding Preferred
Securities are to  be redeemed, the  Preferred Securities will  be redeemed  PRO
RATA  as  described  under "Book-Entry  Only  Issuance --  The  Depository Trust
Company" below.
 
TAX EVENT REDEMPTION OR DISTRIBUTION
 
    "Tax Event" means that the Regular Trustee shall have received an opinion of
a nationally recognized independent tax  counsel experienced in such matters  (a
"Dissolution  Tax Opinion")  to the  effect that  on or  after the  date of this
Prospectus, as  a result  of (a)  any  amendment to,  or change  (including  any
announced  prospective change) in,  the laws (or  any regulations thereunder) of
the United States or  any political subdivision or  taxing authority thereof  or
therein, or (b) any amendment to, or change in, an interpretation or application
of  any such  laws or regulations  by any legislative  body, court, governmental
agency  or  regulatory   authority  which  amendment   or  change  is   enacted,
promulgated,  issued or  announced or  which interpretation  or pronouncement is
issued or announced or which action is taken, in each case on or after the  date
of  this Prospectus, there  is more than  an insubstantial risk  that (i) Sierra
Pacific Capital is, or will  be within 90 days of  the date thereof, subject  to
United States federal income tax with respect to interest accrued or received on
the Junior Subordinated Debentures, (ii) the Trust is, or will be within 90 days
thereof,  subject to  more than a  DE MINIMIS  amount of other  taxes, duties or
other governmental charges or  (iii) interest payable by  Sierra Pacific to  the
Trust  on the Junior  Subordinated Debentures is  not, or within  90 days of the
date thereof will not be, deductible, in whole or in part by Sierra Pacific  for
United States federal income tax purposes.
 
    If,  at  any  time,  a Tax  Event  (as  defined above)  shall  occur  and be
continuing, the  Trust  shall, except  in  the limited  circumstances  described
below, be dissolved with the result that the Junior Subordinated Debentures with
an  aggregate principal amount equal to  the aggregate stated liquidation amount
of, with an interest rate identical to the distribution rate of, and accrued and
unpaid interest  equal  to  accrued  and  unpaid  distributions  on,  the  Trust
Securities,  would  be distributed  to the  holders of  the Trust  Securities in
liquidation of such holders' interests in the  Trust on a pro rata basis  within
90  days  following  the  occurrence  of such  Tax  Event;  PROVIDED,  that such
dissolution and distribution shall be  conditioned on (i) the Regular  Trustee's
receipt   of  an  opinion  of  nationally  recognized  independent  tax  counsel
experienced in such matters (a "No Recognition Opinion"), which opinion may rely
on published revenue rulings of the Internal Revenue Service, to the effect that
the holders of  the Trust Securities  will not  recognize any gain  or loss  for
United  States federal income tax  purposes as a result  of such dissolution and
distribution of Junior  Subordinated Debentures  and (ii)  Sierra Pacific  being
unable  to  avoid  such Tax  Event  within such  90  day period  by  taking some
ministerial action or pursuing some other  reasonable measure that will have  no
adverse  effect  on  the Trust,  Sierra  Pacific  or the  holders  of  the Trust
Securities. Furthermore, if after  receipt of a Dissolution  Tax Opinion by  the
Regular  Trustee (i) Sierra  Pacific has received an  opinion (a "Redemption Tax
Opinion") of nationally recognized independent  tax counsel experienced in  such
matters  that, as a result  of a Tax Event, there  is more than an insubstantial
risk that Sierra Pacific would be  precluded from deducting the interest on  the
Junior  Subordinated Debentures for  United States federal  income tax purposes,
even after the Junior Subordinated Debentures were distributed to the holders of
Trust Securities in  liquidation of  such holders' interests  in Sierra  Pacific
Capital as described above, or (ii) the Regular Trustee shall have been informed
by  such tax  counsel that  it cannot  deliver a  No Recognition  Opinion to the
Trust, Sierra Pacific shall have the right, upon not less than 30 nor more  than
60  days' notice, to redeem  the Junior Subordinated Debentures,  in whole or in
part, for cash within 90 days following  the occurrence of such Tax Event,  and,
following such redemption, Trust Securities with an aggregate liquidation amount
equal to the
 
                                       16
<PAGE>
aggregate  principal amount  of the  Junior Subordinated  Debentures so redeemed
shall be redeemed  by the Trust  at the Redemption  Price on a  PRO RATA  basis;
PROVIDED,  HOWEVER, that if at the time  there is available to Sierra Pacific or
the Trust the opportunity to eliminate, within such 90 day period, the Tax Event
by taking some ministerial action, such as  filing a form or making an  election
or  pursuing some other similar reasonable measure that has no adverse effect on
the Trust, Sierra Pacific or the holders of the Trust Securities, Sierra Pacific
or the Trust will pursue such measure in lieu of redemption.
 
    If the Junior Subordinated Debentures are distributed to the holders of  the
Preferred  Securities, Sierra  Pacific will  use its  best efforts  to cause the
Junior Subordinated  Debentures  to be  listed  on the  NYSE  or on  such  other
exchange as the Preferred Securities are then listed.
 
    After  the date for any distribution  of Junior Subordinated Debentures upon
dissolution of the Trust, (i) the Preferred Securities will no longer be  deemed
to  be outstanding, (ii) the  Depositary (as defined herein)  or its nominee, as
the record holder of the Preferred Securities, will receive a registered  global
certificate  or certificates representing the  Junior Subordinated Debentures to
be delivered upon  such distribution,  and (iii)  any certificates  representing
Preferred Securities not held by the Depositary or its nominee will be deemed to
represent  Junior Subordinated  Debentures having an  aggregate principal amount
equal to  the aggregate  stated liquidation  amount of,  with an  interest  rate
identical  to the distribution rate of, and accrued and unpaid interest equal to
accrued and  unpaid  distributions  on  such  Preferred  Securities  until  such
certificates  are  presented to  Sierra  Pacific or  its  agent for  transfer or
reissuance.
 
    There can be no assurance as to  the market prices for either the  Preferred
Securities  or the  Junior Subordinated  Debentures that  may be  distributed in
exchange for the Preferred  Securities if a dissolution  and liquidation of  the
Trust  were to occur. Accordingly, the Preferred Securities that an investor may
purchase, whether pursuant to the offer made hereby or in the secondary  market,
or  the  Junior  Subordinated  Debentures  that an  investor  may  receive  if a
dissolution and liquidation of the Trust were to occur, may trade at a  discount
to the price that the investor paid to purchase the Preferred Securities offered
hereby.
 
ENFORCEMENT OF CERTAIN RIGHTS BY HOLDERS OF PREFERRED SECURITIES
 
   
    If  a  Declaration  Event  of  Default  (as  defined  below)  occurs  and is
continuing, then the holders of Preferred Securities of the Trust would rely  on
the  enforcement by the Institutional  Trustee of its rights  as a holder of the
Junior Subordinated Debentures against Sierra Pacific. In addition, the  holders
of  a majority in  liquidation amount of  the Preferred Securities  of the Trust
will have the  right to  direct the  time, method  and place  of conducting  any
proceeding  for any remedy  available to the Institutional  Trustee or to direct
the exercise of  any trust  or power  conferred upon  the Institutional  Trustee
under  the Declaration, including the right  to direct the Institutional Trustee
to exercise the remedies available to it as a holder of the Junior  Subordinated
Debentures.  If the Institutional Trustee fails  to enforce its rights under the
Junior Subordinated Debentures, a  holder of Preferred  Securities of the  Trust
may  institute a legal proceeding directly against Sierra Pacific to enforce the
Institutional Trustee's rights under the Junior Subordinated Debentures  without
first  instituting any legal proceeding against the Institutional Trustee or any
other person or entity.  Notwithstanding the foregoing, if  an Event of  Default
under  the  Declaration  has  occurred  and  is  continuing  and  such  event is
attributable to the failure  of Sierra Pacific to  pay interest or principal  on
the  Junior Subordinated  Debentures on the  date such interest  or principal is
otherwise payable (or in the case of redemption, on the redemption date), then a
holder of Preferred Securities of the Trust may directly institute a  proceeding
for enforcement of payment to such holder of the principal of or interest on the
Junior  Subordinated Debentures having a principal amount equal to the aggregate
liquidation amount  of  the  Preferred  Securities of  such  holder  (a  "Direct
Action")   on  or  after  the  respective  due  date  specified  in  the  Junior
Subordinated Debentures. In connection with  such Direct Action, Sierra  Pacific
will  be subrogated to the  rights of such holder  of Preferred Securities under
the Declaration to  the extent of  any payment  made by Sierra  Pacific to  such
holder of Preferred Securities in such Direct Action.
    
 
PROPOSED TAX LEGISLATION
 
    On  March  19, 1996,  President  Clinton proposed  the  Proposed Legislation
which, among other things,  would generally deny  corporate issuers a  deduction
for  interest in respect of certain debt obligations issued on or after December
7, 1995 if such debt obligations have  a maximum term in excess of twenty  years
and are
 
                                       17
<PAGE>
   
not shown as indebtedness on the issuer's applicable consolidated balance sheet.
On  March 29, 1996, the Senate Finance Committee Chairman and the House Ways and
Means Committee Chairman issued the Joint Statement indicating their intent that
certain legislative proposals initiated by the Clinton administration, including
the Proposed  Legislation, that  may be  adopted by  either of  the  tax-writing
committees  of Congress would have an effective date that is no earlier than the
date of "appropriate Congressional action."  Based upon the Joint Statement,  it
is  expected  that  if  the  Proposed  Legislation  were  to  be  enacted,  such
legislation would not apply to the Junior Subordinated Debentures. There can  be
no  assurances, however, that the effective date guidance contained in the Joint
Statement will be  incorporated into  the Proposed Legislation,  if enacted,  or
that  other  legislation  enacted  after  the  date  hereof  will  not otherwise
adversely affect the ability of Sierra Pacific to deduct the interest payable on
the Junior Subordinated Debentures. Accordingly, there can be no assurance  that
a Tax Event will not occur. See "-- Tax Event Redemption or Distribution."
    
 
REDEMPTION PROCEDURES
 
    The  Trust  may  not redeem  fewer  than  all of  the  outstanding Preferred
Securities unless all  accrued and unpaid  distributions have been  paid on  all
Preferred  Securities for all  quarterly distribution periods  terminating on or
prior to the date of redemption.
 
    If the Trust gives a notice of redemption in respect of Preferred Securities
(which notice will be irrevocable), then, by 12:00 noon, New York City time,  on
the  redemption date, provided that Sierra Pacific has paid to the Institutional
Trustee a sufficient amount of cash in connection with the related redemption or
maturity of  the  Junior Subordinated  Debentures,  the Trust  will  irrevocably
deposit  with the Depositary  funds sufficient to  pay the applicable Redemption
Price and will give the Depositary irrevocable instructions and authority to pay
the Redemption Price to the holders of the Preferred Securities. See "Book-Entry
Only Issuance -- The  Depository Trust Company." If  notice of redemption  shall
have  been given and funds deposited as required, then, immediately prior to the
close of  business on  the date  of such  deposit, distributions  will cease  to
accrue  and all  rights of  holders of such  Preferred Securities  so called for
redemption will  cease,  except the  right  of  the holders  of  such  Preferred
Securities  to  receive  the  Redemption  Price  but  without  interest  on such
Redemption Price. In the event that  any date fixed for redemption of  Preferred
Securities  is not a Business Day, then  payment of the Redemption Price payable
on such date  will be made  on the next  succeeding day that  is a Business  Day
(without  any interest or  other payment in  respect of any  such delay), except
that, if such Business Day falls in the next calendar year, such payment will be
made on the immediately preceding Business Day. In the event that payment of the
Redemption Price in respect  of Preferred Securities  is improperly withheld  or
refused  and not  paid either  by Sierra Pacific  Capital, or  by Sierra Pacific
pursuant to  the  Guarantee, distributions  on  such Preferred  Securities  will
continue to accrue at the then applicable rate from the original redemption date
to the date of payment, in which case the actual payment date will be considered
the date fixed for redemption for purposes of calculating the Redemption Price.
 
    In the event that fewer than all of the outstanding Preferred Securities are
to  be redeemed, the Preferred Securities will be redeemed PRO RATA as described
below under "Book-Entry Only Issuance -- The Depository Trust Company."
 
    Subject to the foregoing and applicable law (including, without  limitation,
United  States federal securities laws), Sierra  Pacific or its subsidiaries may
at any time, and from time to time, purchase outstanding Preferred Securities by
tender, in the open market or by private agreement.
 
LIQUIDATION DISTRIBUTION UPON DISSOLUTION
 
    In the  event  of any  voluntary  or involuntary  liquidation,  dissolution,
winding-up  or termination of the Trust (each a "Liquidation"), the then holders
of the Preferred Securities will be entitled to receive out of the assets of the
Trust, after  satisfaction  of liabilities  to  creditors, distributions  in  an
amount  equal  to the  aggregate of  the  stated liquidation  amount of  $25 per
Preferred Security plus accrued and unpaid distributions thereon to the date  of
payment  (the  "Liquidation  Distribution"),  unless,  in  connection  with such
 
                                       18
<PAGE>
Liquidation, Junior  Subordinated Debentures  in an  aggregate stated  principal
amount  equal to  the aggregate stated  liquidation amount of,  with an interest
rate identical to  the distribution  rate of,  and accrued  and unpaid  interest
equal to accrued and unpaid distributions on, the Preferred Securities have been
distributed on a PRO RATA basis to the holders of the Preferred Securities.
 
    If, upon any such Liquidation, the Liquidation Distribution can be paid only
in  part because Sierra Pacific Capital has insufficient assets available to pay
in full  the  aggregate  Liquidation  Distribution,  then  the  amounts  payable
directly  by the Trust on  the Preferred Securities shall be  paid on a PRO RATA
basis. The  holders  of  the  Common Securities  will  be  entitled  to  receive
distributions  upon  any  such dissolution  PRO  RATA  with the  holders  of the
Preferred Securities, except that if a Declaration Event of Default has occurred
and is continuing,  the Preferred Securities  shall have a  preference over  the
Common Securities with regard to such distributions.
 
   
    Pursuant  to the  Declaration, the  Trust shall  terminate (i)  on April 23,
2051, the expiration  of the  term of  the Trust,  (ii) upon  the bankruptcy  of
Sierra  Pacific, (iii) upon  the filing of  a certificate of  dissolution or its
equivalent with  respect to  Sierra  Pacific, the  filing  of a  certificate  of
cancellation  with  respect to  the  Trust after  obtaining  the consent  of the
holders of  at  least a  majority  in  liquidation amount  of  Trust  Securities
affected  thereby voting together as a single  class to file such certificate of
cancellation, or  the  revocation of  the  charter  of Sierra  Pacific  and  the
expiration  of  90 days  after the  date of  revocation without  a reinstatement
thereof, (iv) upon the distribution  of Junior Subordinated Debentures upon  the
occurrence  of  a Tax  Event,  (v) upon  the  entry of  a  decree of  a judicial
dissolution of the holder of the Common Securities, Sierra Pacific or the Trust,
or (vi) upon the redemption of all the Trust Securities.
    
 
DECLARATION EVENTS OF DEFAULT
 
    An event of default  under the Indenture (an  "Indenture Event of  Default")
constitutes  an event of default under the Declaration with respect to the Trust
Securities (a "Declaration Event  of Default"); PROVIDED,  that pursuant to  the
Declaration,  the holder of the Common Securities  will be deemed to have waived
any Declaration Event of Default with respect to the Common Securities until all
Declaration Events of Default with respect to the Preferred Securities have been
cured, waived or otherwise eliminated. Until such Declaration Events of  Default
with  respect  to  the  Preferred  Securities have  been  so  cured,  waived, or
otherwise eliminated,  the Institutional  Trustee will  be deemed  to be  acting
solely on behalf of the holders of the Preferred Securities and only the holders
of  the Preferred  Securities will  have the  right to  direct the Institutional
Trustee with respect to certain matters under the Declaration, and therefore the
Indenture. If the Institutional  Trustee fails to enforce  its rights under  the
Junior Subordinated Debentures after a holder of Preferred Securities has made a
written  request, such holder of record  of Preferred Securities may institute a
legal proceeding against Sierra Pacific  to enforce the Institutional  Trustee's
rights  under the Junior  Subordinated Debentures without  first instituting any
legal proceeding  against  the Institutional  Trustee  or any  other  person  or
entity.  Notwithstanding the  foregoing, if a  Declaration Event  of Default has
occurred and is  continuing and  such event is  attributable to  the failure  of
Sierra  Pacific  to  pay  interest  or  principal  on  the  Junior  Subordinated
Debentures on the date  such interest or principal  is otherwise payable (or  in
the  case of redemption, the redemption  date), Sierra Pacific acknowledges that
then a holder of Preferred Securities may institute a Direct Action for  payment
on  or  after  the respective  due  date  specified in  the  Junior Subordinated
Debentures. In  connection  with such  Direct  Action, Sierra  Pacific  will  be
subrogated  to  the rights  of  such holder  of  Preferred Securities  under the
Declaration to the extent of any payment  made by Sierra Pacific to such  holder
of  Preferred  Securities  in  such  Direct  Action.  The  holders  of Preferred
Securities will not be able to  exercise directly any other remedy available  to
the holders of the Junior Subordinated Debentures.
 
    Upon  the occurrence  of a Declaration  Event of  Default, the Institutional
Trustee as the sole holder of  the Junior Subordinated Debentures will have  the
right under the Indenture to declare the principal of and interest on the Junior
Subordinated  Debentures to be  immediately due and  payable. Sierra Pacific and
Sierra Pacific Capital are each required to file annually with the Institutional
Trustee an officer's certificate  as to its compliance  with all conditions  and
covenants under the Declaration.
 
                                       19
<PAGE>
VOTING RIGHTS
 
    Except as described herein, under the Trust Act, the Trust Indenture Act and
under   "Description  of  the  Guarantee   --  Modification  of  the  Guarantee;
Assignment" herein and  as otherwise required  by law and  the Declaration,  the
holders of the Preferred Securities will have no voting rights.
 
   
    Subject  to the  requirement of  the Institutional  Trustee obtaining  a tax
opinion in  certain  circumstances  set  forth in  the  last  sentence  of  this
paragraph,  the holders  of a  majority in  aggregate liquidation  amount of the
Preferred Securities have  the right  to direct the  time, method  and place  of
conducting any proceeding for any remedy available to the Institutional Trustee,
or  direct the exercise of  any trust or power  conferred upon the Institutional
Trustee under the Declaration  including the right  to direct the  Institutional
Trustee,  as holder of  the Junior Subordinated Debentures,  to (i) exercise the
remedies available  to  it  under  the  Indenture as  a  holder  of  the  Junior
Subordinated  Debentures, (ii) waive any past Indenture Event of Default that is
waivable under  Section 6.6  of the  Indenture or  (iii) exercise  any right  to
rescind or annul a declaration that the principal of all the Junior Subordinated
Debentures shall be due and payable; PROVIDED, HOWEVER, that, where a consent or
action  under the Indenture would require the  consent or act of holders of more
than a majority  in principal amount  of the Junior  Subordinated Debentures  (a
"Super-Majority")   affected  thereby,  only  the   holders  of  at  least  such
Super-Majority in aggregate liquidation amount  of the Preferred Securities  may
direct  the Institutional Trustee to  give such consent or  take such action. If
the  Institutional  Trustee  fails  to  enforce  its  rights  under  the  Junior
Subordinated  Debentures, after a record holder has made a written request, such
holder of  record  of Preferred  Securities  may institute  a  legal  proceeding
directly  against Sierra Pacific  to enforce the  Institutional Trustee's rights
under the Junior  Subordinated Debentures  without first  instituting any  legal
proceeding  against the  Institutional Trustee  or any  other person  or entity.
Notwithstanding the foregoing, if  a Declaration Event  of Default has  occurred
and  is  continuing and  such event  is  attributable to  the failure  of Sierra
Pacific to pay interest  or principal on the  Junior Subordinated Debentures  on
the  date such  interest or principal  is otherwise  payable (or in  the case of
redemption on the redemption  date), then a holder  of Preferred Securities  may
directly institute a proceeding for enforcement of payment to such holder of the
principal  of  or  interest  on  the  Junior  Subordinated  Debentures  having a
principal amount  equal to  the aggregate  liquidation amount  of the  Preferred
Securities  of such holder on or after  the respective due date specified in the
Junior Subordinated  Debentures.  The  Institutional Trustee  shall  notify  all
holders  of the Preferred Securities of any  notice of default received from the
Debt Trustee with  respect to  the Junior Subordinated  Debentures. Such  notice
shall  state that such Indenture Event of Default also constitutes a Declaration
Event of Default. Except with respect to directing the time, method and place of
conducting a proceeding for a remedy,  the Institutional Trustee shall not  take
any  of the  actions described in  clauses (i),  (ii) or (iii)  above unless the
Institutional Trustee has obtained an opinion of tax counsel to the effect that,
as a  result  of  such action,  Sierra  Pacific  Capital will  not  fail  to  be
classified as a grantor trust for United States federal income tax purposes.
    
 
    In  the event the consent of the Institutional Trustee, as the holder of the
Junior Subordinated Debentures, is required under the Indenture with respect  to
any  amendment, modification or termination  of the Indenture, the Institutional
Trustee shall request the direction of the holders of the Trust Securities  with
respect  to  such amendment,  modification or  termination  and shall  vote with
respect to such amendment, modification or termination as directed by a majority
in liquidation amount of the Trust Securities voting together as a single class;
PROVIDED, HOWEVER, that where  a consent under the  Indenture would require  the
consent  of  a  Super-Majority, the  Institutional  Trustee may  only  give such
consent at  the  direction  of  the  holders  of  at  least  the  proportion  in
liquidation  amount of  the Trust  Securities which  the relevant Super-Majority
represents  of  the  aggregate  principal  amount  of  the  Junior  Subordinated
Debentures  outstanding. The Institutional Trustee  shall be under no obligation
to take any such action in accordance with the directions of the holders of  the
Trust Securities unless the Institutional Trustee has obtained an opinion of tax
counsel  to the affect that for the purposes of United States federal income tax
Sierra Pacific Capital will not be classified as other than a grantor trust.
 
    A waiver of an Indenture  Event of Default will  constitute a waiver of  the
corresponding Declaration Event of Default.
 
                                       20
<PAGE>
    Any required approval or direction of holders of Preferred Securities may be
given at a separate meeting of holders of Preferred Securities convened for such
purpose,  at a meeting of all of the  holders of Trust Securities or pursuant to
written consent. The  Regular Trustees  will cause a  notice of  any meeting  at
which  holders of Preferred  Securities are entitled  to vote, or  of any matter
upon which action  by written  consent of  such holders is  to be  taken, to  be
mailed  to each holder of record of  Preferred Securities. Each such notice will
include a statement  setting forth the  following information: (i)  the date  of
such meeting or the date by which such action is to be taken; (ii) a description
of  any resolution proposed for  adoption at such meeting  on which such holders
are entitled to vote or of such matter upon which written consent is sought; and
(iii) instructions for the delivery of  proxies or consents. No vote or  consent
of  the  holders of  Preferred Securities  will be  required for  Sierra Pacific
Capital  to  redeem  and  cancel  Preferred  Securities  or  distribute   Junior
Subordinated Debentures in accordance with the Declaration.
 
    Notwithstanding that holders of Preferred Securities are entitled to vote or
consent  under any  of the circumstances  described above, any  of the Preferred
Securities that are owned at such time by Sierra Pacific or any entity  directly
or  indirectly controlling or controlled by,  or under direct or indirect common
control with,  Sierra Pacific,  shall not  be entitled  to vote  or consent  and
shall,  for purposes of  such vote or  consent, be treated  as if such Preferred
Securities were not outstanding.
 
    The procedures by which holders  of Preferred Securities may exercise  their
voting  rights are  described below.  See " --  Book-Entry Only  Issuance -- The
Depository Trust Company" below.
 
    Holders of the Preferred Securities will have no rights to appoint or remove
the Sierra Pacific Trustees, who may be appointed, removed or replaced solely by
Sierra Pacific as the indirect or direct holder of all of the Common Securities.
 
MODIFICATION OF THE DECLARATION
 
    The Declaration  may be  modified and  amended if  approved by  the  Regular
Trustees  (and  in certain  circumstances  the Institutional  Trustee), provided
that, if any proposed amendment provides for, or the Regular Trustees  otherwise
propose  to  effect, (i)  any  action that  would  adversely affect  the powers,
preferences or  special  rights of  the  Trust  Securities, whether  by  way  of
amendment to the Declaration or otherwise or (ii) the dissolution, winding-up or
termination  of Sierra Pacific Capital  other than pursuant to  the terms of the
Declaration, then  the holders  of the  Trust Securities  voting together  as  a
single  class will be  entitled to vote  on such amendment  or proposal and such
amendment or proposal  shall not  be effective except  with the  approval of  at
least a majority in liquidation amount of the Trust Securities affected thereby;
PROVIDED,  that, if any  amendment or proposal  referred to in  clause (i) above
would adversely affect only the  Preferred Securities or the Common  Securities,
then  only the  affected class  will be  entitled to  vote on  such amendment or
proposal and such amendment or proposal  shall not be effective except with  the
approval of a majority in liquidation amount of such class of Securities.
 
    Notwithstanding  the foregoing, no amendment or  modification may be made to
the Declaration if such amendment or modification would (i) cause Sierra Pacific
Capital to be classified for purposes  of United States federal income  taxation
as  other than a  grantor trust, (ii)  reduce or otherwise  adversely affect the
powers of the Institutional Trustee or (iii) cause Sierra Pacific Capital to  be
deemed  an "investment  company" which  is required  to be  registered under the
Investment Company Act of 1940, as amended (the "1940 Act").
 
MERGERS, CONSOLIDATIONS OR AMALGAMATIONS
 
    Sierra Pacific Capital may not consolidate, amalgamate, merge with or  into,
or  be  replaced by,  or convey,  transfer  or lease  its properties  and assets
substantially as  an entirety,  to  any corporation  or  other body,  except  as
described  below. Sierra  Pacific Capital may,  with the consent  of the Regular
Trustees and without  the consent of  the holders of  the Trust Securities,  the
Institutional  Trustee or  the Delaware  Trustee consolidate,  amalgamate, merge
with or into, or be replaced by a trust organized as such under the laws of  any
State  of the United States; PROVIDED, that (i) if the Trust is not the survivor
such successor entity  either (x) expressly  assumes all of  the obligations  of
Sierra  Pacific Capital  under the Trust  Securities or (y)  substitutes for the
Preferred Securities other securities having substantially the same terms as the
Trust Securities (the
 
                                       21
<PAGE>
   
"Successor Securities"), so long  as the Successor Securities  rank the same  as
the  Trust  Securities  rank with  respect  to distributions  and  payments upon
liquidation,  redemption   and   otherwise,  (ii)   Sierra   Pacific   expressly
acknowledges  a trustee of such successor  entity possessing the same powers and
duties as the  Institutional Trustee as  the holder of  the Junior  Subordinated
Debentures,  (iii)  the Preferred  Securities  or any  Successor  Securities are
listed, or  any  Successor  Securities  will  be  listed  upon  notification  of
issuance,  on any national  securities exchange or  with another organization on
which the Preferred  Securities are  then listed  or quoted,  (iv) such  merger,
consolidation,   amalgamation  or  replacement  does  not  cause  the  Preferred
Securities (including  any Successor  Securities) to  be downgraded  by  Moody's
Investors  Service,  Inc. or  Standard &  Poor's  Corporation, (v)  such merger,
consolidation, amalgamation or replacement does not adversely affect the rights,
preferences and privileges of the holders of the Trust Securities (including any
Successor Securities) in any  material respect (other than  with respect to  any
dilution of the holders' interest in the new entity), (vi) such successor entity
has  a purpose identical to that of  Sierra Pacific Capital, (vii) prior to such
merger, consolidation, amalgamation or replacement, Sierra Pacific has  received
an  opinion of  a nationally  recognized independent  counsel to  Sierra Pacific
Capital experienced  in  such  matters  to the  effect  that  (A)  such  merger,
consolidation, amalgamation or replacement does not adversely affect the rights,
preferences and privileges of the holders of the Trust Securities (including any
Successor  Securities) in any  material respect (other than  with respect to any
dilution of the  holders' interest in  the new entity),  and (B) following  such
merger,  consolidation,  amalgamation  or  replacement,  neither  Sierra Pacific
Capital nor such successor entity will be required to register as an  investment
company  under the 1940 Act and (viii) Sierra Pacific guarantees the obligations
of such successor entity under the  Successor Securities at least to the  extent
provided  by the Guarantee and  the Common Securities Guarantee. Notwithstanding
the foregoing, Sierra  Pacific Capital  shall not,  except with  the consent  of
holders  of 100%  in liquidation  amount of  the Trust  Securities, consolidate,
amalgamate, merge with or into, or be replaced by any other entity or permit any
other entity to consolidate, amalgamate, merge  with or into, or replace it,  if
such  consolidation,  amalgamation,  merger or  replacement  would  cause Sierra
Pacific Capital or the Successor Entity to be classified as other than a grantor
trust for United States federal income tax purposes.
    
 
BOOK-ENTRY ONLY ISSUANCE -- THE DEPOSITORY TRUST COMPANY
 
   
    The Depository Trust Company ("DTC") will act as securities depositary  (the
"Depositary")  for the  Preferred Securities.  The Preferred  Securities will be
issued only as fully-registered securities registered in the name of Cede &  Co.
(DTC's  nominee).  One  or  more  fully-registered  global  Preferred Securities
certificates, representing the total  aggregate number of Preferred  Securities,
will be issued and will be deposited with DTC.
    
 
    DTC  is a limited-purpose trust company organized under the New York Banking
Law, a "banking organization" within the meaning of the New York Banking Law,  a
member  of  the  Federal Reserve  System,  a "clearing  corporation"  within the
meaning of  the  New  York  Uniform Commercial  Code  and  a  "clearing  agency"
registered  pursuant to the provisions  of Section 17A of  the Exchange Act. DTC
holds securities that  its participants ("Participants")  deposit with DTC.  DTC
also  facilitates the settlement among  Participants of securities transactions,
such as  transfers  and  pledges, in  deposited  securities  through  electronic
computerized  book-entry changes in  Participants' accounts, thereby eliminating
the need for physical movement  of securities certificates. Participants in  DTC
include  securities  brokers  and  dealers,  banks,  trust  companies,  clearing
corporations and certain other  organizations. DTC is owned  by a number of  its
Participants  and  by  the NYSE,  the  American  Stock Exchange,  Inc.,  and the
National Association of  Securities Dealers, Inc.  Access to the  DTC system  is
also  available to  others, such  as securities  brokers and  dealers, banks and
trust companies that clear transactions through or maintain a direct or indirect
custodial  relationship  with  a  Participant  either  directly  or   indirectly
("Indirect  Participants"). The rules applicable to DTC and its Participants are
on file with the Securities and Exchange Commission.
 
    Purchases of Preferred Securities within the  DTC system must be made by  or
through  Participants, which will receive a  credit for the Preferred Securities
on DTC's  records. The  ownership  interest of  each  actual purchaser  of  each
Preferred  Security  ("Beneficial  Owner") is  in  turn  to be  recorded  on the
Participants' records. Beneficial Owners  will not receive written  confirmation
from  DTC  of their  purchases, but  Beneficial Owners  are expected  to receive
written  confirmations   providing  details   of  the   transactions,  as   well
 
                                       22
<PAGE>
as  periodic statements of  their holdings, from  the Participants through which
the Beneficial  Owners purchased  Preferred Securities.  Transfers of  ownership
interests  in the Preferred Securities are to be accomplished by entries made on
the books  of Participants  acting on  behalf of  Beneficial Owners.  Beneficial
Owners  will not receive certificates  representing their ownership interests in
the Preferred Securities, except in the event that use of the book-entry  system
for the Preferred Securities is discontinued.
 
   
    The laws of some jurisdictions require that certain purchasers of securities
take  physical delivery of  securities in definitive form.  Such laws may impair
the ability to transfer beneficial interests in the global Preferred  Securities
as represented by a global certificate.
    
 
    DTC  has  no knowledge  of  the actual  Beneficial  Owners of  the Preferred
Securities. DTC's records reflect only  the identity of the Direct  Participants
to  whose accounts such Preferred Securities are  credited, which may or may not
be the Beneficial Owners. The Participants and Indirect Participants will remain
responsible for keeping account of their holdings on behalf of their customers.
 
    So long as  DTC, or  its nominee,  is the registered  owner or  holder of  a
Global  Certificate, DTC or such nominee, as the case may be, will be considered
the sole owner or holder of the Preferred Securities represented thereby for all
purposes under the Declaration and the Preferred Securities. No beneficial owner
of an interest in a  Global Certificate will be  able to transfer that  interest
except  in accordance  with DTC's  applicable procedures,  in addition  to those
provided for under the Declaration.
 
    DTC has advised Sierra Pacific that it will take any action permitted to  be
taken  by  a  holder  of Preferred  Securities  (including  the  presentation of
Preferred Securities for exchange as described  below) only at the direction  of
one  or  more Participants  to whose  account  the DTC  interests in  the Global
Certificates are credited and only in  respect of such portion of the  aggregate
liquidation  amount  of Preferred  Securities as  to  which such  Participant or
Participants has or have given such direction. However, if there is an Event  of
Default   under  the  Preferred   Securities,  DTC  will   exchange  the  Global
Certificates for  Certificated  Securities,  which it  will  distribute  to  its
Participants  and which will be legended as set forth under the heading "Notices
to Investors."
 
    Conveyance of notices and  other communications by  DTC to Participants,  by
Direct  Participants to Indirect  Participants and by  Participants and Indirect
Participants to Beneficial Owners will  be governed by arrangements among  them,
subject  to any statutory  or regulatory requirements  as may be  in effect from
time to time.
 
   
    Redemption notices in respect of the Preferred Securities held in book-entry
form shall be sent to  Cede & Co. If less  than all of the Preferred  Securities
are  being  redeemed, DTC  will determine  the  amount of  the interest  of each
Participant to be redeemed  in accordance with  its procedures. Although  voting
with respect to the Preferred Securities is limited, in those cases where a vote
is required, neither DTC nor Cede & Co. will itself consent or vote with respect
to  Preferred Securities. Under its usual  procedures, DTC would mail an Omnibus
Proxy to Sierra Pacific Capital as soon  as possible after the record date.  The
Omnibus  Proxy  assigns  Cede  &  Co.'s consenting  or  voting  rights  to those
Participants to  whose accounts  the Preferred  Securities are  credited on  the
record  date (identified  in a  listing attached  to the  Omnibus Proxy). Sierra
Pacific and  Sierra Pacific  Capital believe  that the  arrangements among  DTC,
Direct  and  Indirect  Participants,  and  Beneficial  Owners  will  enable  the
Beneficial Owners to exercise rights equivalent in substance to the rights  that
can be directly exercised by a holder of a beneficial interest in Sierra Pacific
Capital.
    
 
   
    Distributions  on the Preferred  Securities held in  book-entry form will be
made to  DTC  in  immediately  available funds.  DTC's  practice  is  to  credit
Participants'  accounts on  the relevant payment  date in  accordance with their
respective holdings shown on DTC's records unless DTC has reason to believe that
it will not receive payments on such payment date. Payments by Participants  and
Indirect  Participants  to  Beneficial  Owners  will  be  governed  by  standing
instructions and  customary practices  and will  be the  responsibility of  such
Participants  and not of DTC, Sierra  Pacific Capital or Sierra Pacific, subject
to any statutory or regulatory requirements to the contrary as may be in  effect
from  time to time. Although DTC has agreed to the foregoing procedures in order
to  facilitate  transfer   of  interests  in   the  Global  Certificates   among
    
 
                                       23
<PAGE>
   
Participants  of  DTC, DTC  is under  no  obligation to  perform or  continue to
perform such procedures, and  such procedures may be  discontinued at any  time.
Neither  Sierra Pacific, the Trust nor the Sierra Pacific Trustees will have any
responsibility for  the  performance by  DTC  or its  Participants  or  Indirect
Participants   under  the  rules  and   procedures  governing  DTC.  Payment  of
distributions  to  DTC  is  the   responsibility  of  Sierra  Pacific   Capital,
disbursement  of such payments to Participants is the responsibility of DTC, and
disbursement of such payments to the Beneficial Owners is the responsibility  of
Participants and Indirect Participants.
    
 
    Except  as provided herein,  a Beneficial Owner  of an interest  in a Global
Certificate will  not be  entitled  to receive  physical delivery  of  Preferred
Securities.  Accordingly, each Beneficial  Owner must rely  on the procedures of
DTC to exercise any rights under the Preferred Securities.
 
   
    DTC may discontinue  providing its  services as  securities depositary  with
respect  to the Preferred Securities at any  time by giving reasonable notice to
Sierra Pacific Capital. Under such circumstances, in the event that a  successor
securities  depositary is  not obtained,  Preferred Securities  certificates are
required to be printed and delivered. Additionally, the Trust (with the  consent
of  Sierra Pacific) may  decide to discontinue  use of the  system of book-entry
transfers through  DTC  (or  any  successor  depositary)  with  respect  to  the
Preferred  Securities. In that event,  certificates for the Preferred Securities
will be  printed and  delivered.  In each  of  the above  circumstances,  Sierra
Pacific will appoint a paying agent with respect to the Preferred Securities.
    
 
INFORMATION CONCERNING THE INSTITUTIONAL TRUSTEE
 
    The Institutional Trustee, prior to the occurrence of a default with respect
to  the Trust  Securities and  after the  curing of  any defaults  that may have
occurred, undertakes to perform only such  duties as are specifically set  forth
in the Declaration and, after default, shall exercise the same degree of care as
a  prudent individual would exercise  in the conduct of  his or her own affairs.
Subject to such provisions, the Institutional Trustee is under no obligation  to
exercise any of the powers vested in it by the Declaration at the request of any
holder  of  Preferred Securities,  unless offered  reasonable indemnity  by such
holder against  the costs,  expenses  and liabilities  which might  be  incurred
thereby.  The holders of Preferred Securities will not be required to offer such
indemnity in the event such holders,  by exercising their voting rights,  direct
the  Institutional Trustee to take any action  it is empowered to take under the
Declaration following a Declaration Event of Default. The Institutional  Trustee
also serves as trustee under the Guarantee and the Indenture.
 
PAYMENT AND PAYING AGENCY
 
    Payments  in respect of  the Preferred Securities  represented by the Global
Certificates shall be made to DTC,  which shall credit the relevant accounts  at
DTC  on  the  applicable distribution  dates  or,  in the  case  of Certificated
Securities, such payments shall be  made by check mailed  to the address of  the
holder entitled thereto as such address shall appear on the Register. The Paying
Agent  shall  initially  be  the  Institutional  Trustee  who  may  designate an
additional or substitute paying agent at any time. Registration of transfers  of
Preferred  Securities will be effected without charge  by or on behalf of Sierra
Pacific Capital, but upon payment (with  the giving of such indemnity as  Sierra
Pacific  Capital or Sierra Pacific  may require) in respect  of any tax or other
government charges imposed in relation to it. Sierra Pacific Capital will not be
required to  register  or cause  to  be  registered the  transfer  of  Preferred
Securities after such Preferred Securities have been called for redemption.
 
GOVERNING LAW
 
    The  Declaration  and  the Preferred  Securities  will be  governed  by, and
construed in accordance with, the internal laws of the State of Delaware.
 
MISCELLANEOUS
 
    The Regular Trustees are authorized  and directed to operate Sierra  Pacific
Capital  in such a  way so that Sierra  Pacific Capital will  not be required to
register as an "investment company" under the 1940 Act or characterized as other
than a  grantor trust  for United  States federal  income tax  purposes.  Sierra
Pacific  is authorized and  directed to conduct  its affairs so  that the Junior
Subordinated Debentures will be treated as
 
                                       24
<PAGE>
indebtedness of Sierra Pacific for United States federal income tax purposes. In
this connection, Sierra Pacific and the Regular Trustees are authorized to  take
any  action, not inconsistent  with applicable law, the  certificate of trust of
Sierra Pacific Capital or the articles of incorporation of Sierra Pacific,  that
each of Sierra Pacific and the Regular Trustees determine in their discretion to
be  necessary or desirable to achieve such end,  as long as such action does not
adversely affect the  interests of the  holders of the  Preferred Securities  or
vary the terms thereof.
 
    Holders of the Preferred Securities have no preemptive rights.
 
                          DESCRIPTION OF THE GUARANTEE
 
    Set  forth below is a summary  of information concerning the Guarantee which
will be executed and delivered by Sierra Pacific for the benefit of the  holders
of  Preferred Securities. The Guarantee will  be qualified as an indenture under
the Trust Indenture Act. IBJ Schroder Bank & Trust Company will act as indenture
trustee under the Guarantee (the "Guarantee Trustee") for purposes of the  Trust
Indenture  Act.  The terms  of the  Guarantee will  be those  set forth  in such
Guarantee and those made part of such Guarantee by the Trust Indenture Act.  The
following  summary  of the  material terms  is  subject in  all respects  to the
provisions of, and is  qualified in its  entirety by reference  to, the form  of
Guarantee,  which is filed as an exhibit  to the Registration Statement of which
this Prospectus forms a part, and the Trust Indenture Act. The Guarantee will be
held by the Guarantee Trustee  for the benefit of  the holders of the  Preferred
Securities of the Trust.
 
GENERAL
 
   
    Pursuant  to the  Guarantee, Sierra Pacific  will irrevocably  agree, to the
extent set  forth therein,  to pay  in full,  to the  holders of  the  Preferred
Securities  issued  by the  Trust, the  Guarantee  Payments (as  defined herein)
(except to the extent  paid by the  Trust), as and when  due, regardless of  any
defense,  right of set-off or  counterclaim which the Trust  may have or assert.
The following payments with respect to Preferred Securities issued by the  Trust
to  the extent not paid by such Trust (the "Guarantee Payments") will be subject
to the  Guarantee thereon  (without  duplication): (i)  any accrued  and  unpaid
distributions which are required to be paid on such Preferred Securities, to the
extent  the Trust shall have funds available therefor; (ii) the redemption price
(the "Redemption  Price"), and  all  accrued and  unpaid distributions,  to  the
extent  the Trust  has funds  available therefor  with respect  to any Preferred
Securities called for  redemption by  the Trust and  (iii) upon  a voluntary  or
involuntary  dissolution, winding-up or termination of  the Trust (other than in
connection with  the  distribution  of Junior  Subordinated  Debentures  to  the
holders  of  Preferred Securities  or  the redemption  of  all of  the Preferred
Securities), the lesser of (a) the  aggregate of the liquidation amount and  all
accrued  and unpaid  distributions on such  Preferred Securities to  the date of
payment, to the extent the Trust has funds available therefor and (b) the amount
of assets of the  Trust remaining available for  distribution to holders of  the
Preferred  Securities in liquidation of the  Trust. The redemption price and the
liquidation amount  will be  fixed  at the  time  the Preferred  Securities  are
issued. Sierra Pacific's obligation to make a Guarantee Payment may be satisfied
by  direct payment of the  required amounts by Sierra  Pacific to the holders of
Preferred Securities  or  by causing  the  Trust to  pay  such amounts  to  such
holders.  The Guarantee will  not apply to  any payment of  distributions on the
Preferred Securities except to the extent  the Trust shall have funds  available
therefor.  If  Sierra Pacific  does  not make  interest  payments on  the Junior
Subordinated  Debentures  purchased  by  the  Trust,  the  Trust  will  not  pay
distributions  on the Preferred Securities issued by the Trust and will not have
funds available therefor. See "Description of Junior Subordinated Debentures  --
Certain  Covenants  of the  Company." The  Guarantee,  when taken  together with
Sierra Pacific's  obligations  under  the Junior  Subordinated  Debentures,  the
Indenture and the Declaration, including its obligations to pay costs, expenses,
debts  and  liabilities of  the  Trust (other  than  with respect  to  the Trust
Securities), will provide a full  and unconditional guarantee on a  subordinated
basis by Sierra Pacific of payments due on the Preferred Securities.
    
 
    Sierra Pacific has also agreed separately to irrevocably and unconditionally
guarantee  the  obligations  of  the  Trust with  respect  to  the  Trust Common
Securities (the "Common Securities Guarantee") to the same
 
                                       25
<PAGE>
   
extent as  the  Guarantee,  except that  upon  an  event of  default  under  the
Declaration, holders of Preferred Securities shall have priority over holders of
Common  Securities with  respect to  distributions and  payments on liquidation,
redemption or otherwise.
    
 
CERTAIN COVENANTS OF SIERRA PACIFIC
 
    In the  Guarantee,  Sierra  Pacific  will covenant  that,  so  long  as  any
Preferred Securities issued by the Trust remain outstanding, if there shall have
occurred  any  event  that  would  constitute an  event  of  default  under such
Guarantee or the  Declaration of the  Trust, then (a)  Sierra Pacific shall  not
declare  or pay  any dividend  on, make  any distributions  with respect  to, or
redeem, purchase  or make  a liquidation  payment with  respect to,  any of  its
capital  stock (other  than (i)  purchases or  acquisitions of  shares of Common
Stock in connection with the satisfaction  by Sierra Pacific of its  obligations
under  any employee  benefit plans,  (ii) as a  result of  a reclassification of
Sierra Pacific's  capital  stock  or  the exchange  or  (iii)  the  purchase  of
fractional interests in shares of Sierra Pacific's capital stock pursuant to the
conversion or exchange provisions of such capital stock of Sierra Pacific or the
security  being converted or  exchanged), (b) Sierra Pacific  shall not make any
payment of interest, principal  or premium, if any,  on or repay, repurchase  or
redeem any debt securities (including guarantees) issued by Sierra Pacific which
rank  PARI PASSU with or  junior to such Junior  Subordinated Debentures and (c)
Sierra Pacific  shall  not make  any  guarantee  payments with  respect  to  the
foregoing (other than pursuant to the Guarantee).
 
MODIFICATION OF THE GUARANTEE; ASSIGNMENT
 
    Except  with respect to any changes which do not adversely affect the rights
of holders of Preferred Securities (in which case no vote will be required), the
Guarantee may be amended only with the prior approval of the holders of not less
than a majority in  liquidation amount of  the outstanding Preferred  Securities
issued  by the Trust.  All guarantees and agreements  contained in the Guarantee
shall bind the successors, assigns,  receivers, trustees and representatives  of
Sierra  Pacific and shall inure  to the benefit of  the holders of the Preferred
Securities of the Trust then outstanding.
 
TERMINATION
 
    The Guarantee will terminate  as to the Preferred  Securities issued by  the
Trust  (a) upon full payment of the Redemption Price of all Preferred Securities
of the Trust, (b) upon distribution  of the Junior Subordinated Debentures  held
by the Trust to the holders of the Preferred Securities of the Trust or (c) upon
full  payment of the amounts  payable in accordance with  the Declaration of the
Trust upon liquidation of the Trust. The Guarantee will continue to be effective
or will  be reinstated,  as  the case  may be,  if  at any  time any  holder  of
Preferred  Securities issued by the Trust must  restore payment of any sums paid
under such Preferred Securities or  the Guarantee. The subordination  provisions
of  the Junior Subordinated Debentures provide that in the event payment is made
on the Junior Subordinated Debentures or the Guarantee in contravention of  such
provisions,  such  payments  shall  be  paid  over  to  the  holders  of  Senior
Indebtedness.
 
EVENTS OF DEFAULT
 
    An event  of default  under the  Guarantee will  occur upon  the failure  of
Sierra Pacific to perform any of its payment or other obligations thereunder.
 
    The  holders of a majority in liquidation amount of the Preferred Securities
relating to the Guarantee have the right to direct the time, method and place of
conducting any proceeding for any remedy  available to the Guarantee Trustee  in
respect  of  the Guarantee  or to  direct the  exercises of  any trust  or power
conferred upon the  Guarantee Trustee  under such Preferred  Securities. If  the
Guarantee  Trustee  fails to  enforce such  Guarantee,  any holder  of Preferred
Securities relating to such Guarantee may institute a legal proceeding  directly
against  Sierra Pacific  to enforce  the Guarantee  Trustee's rights  under such
Guarantee, without first
 
                                       26
<PAGE>
   
instituting  a legal proceeding against the  Trust, the Guarantee Trustee or any
other person or  entity. Notwithstanding  the foregoing, if  Sierra Pacific  has
failed  to  make  a Guarantee  Payment,  a  holder of  Preferred  Securities may
directly institute a proceeding  against Sierra Pacific  for enforcement of  the
Guarantee for such payment. Sierra Pacific waives any right or remedy to require
that any action be brought first against the Trust or any other person or entity
before proceeding directly against Sierra Pacific.
    
 
STATUS OF THE GUARANTEE
 
    The  Guarantee will constitute an unsecured obligation of Sierra Pacific and
will rank  (i)  subordinate  and  junior  in  right  of  payment  to  all  other
liabilities of Sierra Pacific, (ii) PARI PASSU with the most senior preferred or
preference  stock  now  or  hereafter  issued by  Sierra  Pacific  and  with any
guarantee now or  hereafter entered  into by Sierra  Pacific in  respect of  any
preferred  or preference  stock of  any affiliate  of Sierra  Pacific; and (iii)
senior to Sierra Pacific's common stock.  The terms of the Preferred  Securities
provide  that  each  holder  of  Preferred Securities  issued  by  the  Trust by
acceptance thereof agrees to the subordination provisions and other terms of the
Guarantee.
 
    The Guarantee will constitute a guarantee  of payment and not of  collection
(that is, the guaranteed party may institute a legal proceeding directly against
the  guarantor to enforce  its rights under the  guarantee without instituting a
legal proceeding against any other person or entity).
 
INFORMATION CONCERNING THE GUARANTEE TRUSTEE
 
    The Guarantee Trustee, prior to the occurrence of a default with respect  to
the  Guarantee, undertakes to  perform only such duties  as are specifically set
forth in the  Guarantee and, after  default, shall exercise  the same degree  of
care  as a prudent  individual would exercise in  the conduct of  his or her own
affairs.  Subject  to  such  provisions,  the  Guarantee  Trustee  is  under  no
obligation  to exercise any of  the powers vested in it  by the Guarantee at the
request of  any  holder  of  Preferred  Securities,  unless  offered  reasonable
indemnity  against the costs,  expenses and liabilities  which might be incurred
thereby.
 
               DESCRIPTION OF THE JUNIOR SUBORDINATED DEBENTURES
 
   
    Set forth  below  is a  description  of the  specific  terms of  the  Junior
Subordinated Debentures in which Sierra Pacific Capital will invest the proceeds
from the issuance and sale of the Trust Securities. The following summary of the
material  terms  does not  purport  to be  complete and  is  subject to,  and is
qualified in its entirety by  reference to, the Indenture,  dated as of June  1,
1996  (the "Indenture"),  between Sierra Pacific  and IBJ Schroder  Bank & Trust
Company, as  Trustee (the  "Debt Trustee").  Whenever particular  provisions  or
defined  terms  in the  Indenture  are referred  to  herein, such  provisions or
defined terms are incorporated by reference herein.
    
 
    Under certain  circumstances involving  the  dissolution of  Sierra  Pacific
Capital  following the occurrence of a Tax Event, Junior Subordinated Debentures
may be distributed  to the  holders of the  Trust Securities  in liquidation  of
Sierra  Pacific Capital.  See "Description  of the  Preferred Securities  -- Tax
Event Redemption or Distribution."
 
    If the Junior Subordinated Debentures are distributed to the holders of  the
Preferred  Securities,  Sierra Pacific  will use  its best  efforts to  have the
Junior Subordinated Debentures  listed on  the NYSE  or on  such other  national
securities  exchange or similar  organization on which  the Preferred Securities
are then listed or quoted.
 
GENERAL
 
   
    The  Junior  Subordinated  Debentures  will  be  issued  as  unsecured  debt
securities  under  the Indenture.  The Indenture  does  not limit  the aggregate
principal amount of debt securities which may be issued thereunder and  provides
that  the debt securities may  be issued thereunder from time  to time in one or
more series. However, the Junior  Subordinated Debentures, as a separate  series
of   debt  securities,  will  be  limited   in  aggregate  principal  amount  of
$50,000,000, such amount being  the sum of the  aggregate stated liquidation  of
the Preferred Securities and the Common Securities.
    
 
                                       27
<PAGE>
    The  Junior  Subordinated  Debentures  are not  subject  to  a  sinking fund
provision. The entire  principal amount  of the  Junior Subordinated  Debentures
will  mature and become  due and payable,  together with any  accrued and unpaid
interest thereon including Additional Interest  (as defined herein), if any,  on
           , 2036.
 
   
    If  Junior Subordinated Debentures  are distributed to  holders of Preferred
Securities in liquidation of such holders' interests in Sierra Pacific  Capital,
such  Junior Subordinated  Debentures will  initially be  issued as  one or more
Global Securities (as defined under  "Book-Entry and Settlement" herein).  Under
certain  limited circumstances, Junior Subordinated  Debentures may be issued in
certificated form in exchange  for a Global Security.  In the event that  Junior
Subordinated   Debentures  are   issued  in   certificated  form,   such  Junior
Subordinated Debentures will be in  denominations of $25 and integral  multiples
thereof and may be transferred or exchanged at the offices described below.
    
 
   
    Payments  on Junior Subordinated Debentures issued as a Global Security will
be made to DTC, a  successor depositary or, in the  event that no depositary  is
used,  to a Paying  Agent for the  Junior Subordinated Debentures.  In the event
Junior Subordinated Debentures  are issued in  certificated form, principal  and
interest  will be  payable, the transfer  of the  Junior Subordinated Debentures
will be registrable and Junior Subordinated Debentures will be exchangeable  for
Junior  Subordinated  Debentures  of  other denominations  of  a  like aggregate
principal amount at the corporate trust office of the Debt Trustee in New  York,
New York; PROVIDED, that at the option of Sierra Pacific payment of interest may
be made by check mailed to the address of the holder entitled thereto or by wire
transfer  to an account appropriately designated by the holder entitled thereto.
Notwithstanding the foregoing, so long as the holder of any Junior  Subordinated
Debentures  is the Institutional Trustee, the  payment of principal and interest
on the Junior Subordinated Debentures held by the Institutional Trustee will  be
made at such place and to such account as may be designated by the Institutional
Trustee.
    
 
    There  are no covenants or provisions  in the Indenture which afford holders
of the  Junior Subordinated  Debentures  protection in  the  event of  a  highly
leveraged transaction or other similar transaction involving Sierra Pacific that
may adversely affect such holders.
 
INTEREST
 
   
    Each  Junior Subordinated Debenture shall  bear interest at the  rate of   %
per annum from the  original date of issuance,  payable quarterly in arrears  on
March  31, June 30, September 30 and December 31 of each year (each an "Interest
Payment Date"), commencing September 30, 1996, to the person in whose name  such
Junior  Subordinated Debenture is registered,  subject to certain exceptions, at
the close of business on the  Business Day next preceding such Interest  Payment
Date.  In the  event the  Junior Subordinated  Debentures shall  not continue to
remain in book-entry only  form, Sierra Pacific shall  have the right to  select
record  dates, which shall be  more than one Business  Day prior to the Interest
Payment Date.
    
 
   
    The amount of interest payable for any period will be computed on the  basis
of  a 360-day year of  twelve 30-day months. The  amount of interest payable for
any period shorter than a full  quarterly period for which interest is  computed
will  be computed on the  basis of the actual number  of days elapsed per 30-day
month. In the event  that any date  on which interest is  payable on the  Junior
Subordinated  Debentures is  not a  Business Day,  then payment  of the interest
payable on such date will be made on the next succeeding day which is a Business
Day (and without any interest  or other payment in  respect of any such  delay),
except  that, if such Business Day is in the next succeeding calendar year, then
such payment shall be  made on the immediately  preceding Business Day, in  each
case with the same force and effect as if made on such date.
    
 
PROPOSED TAX LEGISLATION
 
    On  March  19, 1996,  President  Clinton proposed  the  Proposed Legislation
which, among other things,  would generally deny  corporate issuers a  deduction
for  interest in respect of certain debt obligations issued on or after December
7, 1995 if such debt obligations have  a maximum term in excess of twenty  years
and  are  not  shown as  indebtedness  on the  issuer's  applicable consolidated
balance sheet. On March 29, 1996, the Senate Finance Committee Chairman and  the
House Ways and Means Committee Chairman issued the
 
                                       28
<PAGE>
Joint  Statement  indicating  their intent  that  certain  legislative proposals
initiated by the Clinton administration including the Proposed Legislation, that
may be adopted by either of the tax-writing committees of Congress would have an
effective date that is  no earlier than the  date of "appropriate  Congressional
action."  Based upon the  Joint Statement, it  is expected that  if the Proposed
Legislation were to be enacted, such  legislation would not apply to the  Junior
Subordinated Debentures. There can be no assurances, however, that the effective
date  guidance contained  in the Joint  Statement will be  incorporated into the
Proposed Legislation, if enacted,  or that other  legislation enacted after  the
date hereof will not otherwise adversely affect the ability of Sierra Pacific to
deduct  the interest payable on the Junior Subordinated Debentures. Accordingly,
there can be no assurance that a  Tax Event will not occur. See "Description  of
the Preferred Securities -- Tax Event Redemption or Distribution."
 
SUBORDINATION
 
    The   Indenture  provides  that  the   Junior  Subordinated  Debentures  are
subordinated and junior in right of payment to all Senior Indebtedness of Sierra
Pacific. No payment  of principal  (including redemption), premium,  if any,  or
interest  on the Junior  Subordinated Debentures may  be made (i)  if any Senior
Indebtedness of Sierra  Pacific is not  paid when due  and any applicable  grace
period  with respect  to such default  has ended  and such default  has not been
cured or  waived  or  ceased to  exist,  or  (ii) the  maturity  of  any  Senior
Indebtedness  of Sierra Pacific has been  accelerated because of a default. Upon
any distribution of assets of Sierra Pacific to creditors upon any  dissolution,
winding-up,  liquidation or reorganization, whether voluntary or involuntary, or
in bankruptcy, insolvency, receivership or other proceedings, all principal  and
premium, if any, and interest due or to become due on all Senior Indebtedness of
Sierra  Pacific must be paid  in full before the  holders of Junior Subordinated
Debentures are entitled to receive or  retain any payment. Upon satisfaction  of
all  claims  of all  Senior  Indebtedness then  outstanding,  the rights  of the
holders of the Junior Subordinated Debentures  will be subrogated to the  rights
of  the holders of Senior Indebtedness of  Sierra Pacific to receive payments or
distributions applicable to Senior Indebtedness  until all amounts owing on  the
Junior Subordinated Debentures are paid in full.
 
   
    The  term "Senior Indebtedness"  means, with respect  to Sierra Pacific, (i)
the principal, premium, if any, and  interest in respect of (A) indebtedness  of
Sierra Pacific, for money borrowed and (B) indebtedness evidenced by securities,
debentures,  bonds  or  other  similar  instruments  issued  by  Sierra Pacific,
including, without limitation, all obligations  under the Indenture of  Mortgage
dated  as of December 1, 1940, between  Sierra Pacific and The New England Trust
Company (State Street Bank and Trust  Company, as successor trustee) and Leo  W.
Huegle (Gerald R. Wheeler, as successor trustee), and Collateral Trust Indenture
dated  June 1, 1992, between Sierra Pacific  and Bankers Trust Company, (ii) all
capital lease obligations  of Sierra  Pacific, (iii) all  obligations of  Sierra
Pacific  issued  or assumed  as  the deferred  purchase  price of  property, all
conditional sale obligations  of Sierra  Pacific and all  obligations of  Sierra
Pacific  under  any  title  retention agreement  (but  excluding  trade accounts
payable arising in  the ordinary course  of business), (iv)  all obligations  of
Sierra  Pacific  for  the  reimbursement  on  any  letter  of  credit,  banker's
acceptance, security purchase  facility or similar  credit transaction, (v)  all
obligations  of the type referred to in  clauses (i) through (iv) above of other
persons for the  payment of  which Sierra Pacific  is responsible  or liable  as
obligor, guarantor or otherwise and (vi) all obligations of the type referred to
in  clauses (i) through  (v) above of other  persons secured by  any lien on any
property or asset of Sierra Pacific  (whether or not such obligation is  assumed
by  Sierra Pacific), except for  (1) any such indebtedness  that is by its terms
subordinated to or PARI  PASSU with the Junior  Subordinated Debentures and  (2)
any  indebtedness between or  among Sierra Pacific  or its affiliates, including
all other debt securities  and guarantees in respect  of those debt  securities,
issued  to any  other trust, or  a trustee  of such trust,  partnership or other
entity affiliated with  Sierra Pacific  that is  a financing  vehicle of  Sierra
Pacific (a "Financing Entity") in connection with the issuance by such financial
entity of Preferred Securities or other securities that rank PARI PASSU with, or
junior  to, the Preferred Securities. Such Senior Indebtedness shall continue to
be Senior Indebtedness  and be  entitled to  the benefits  of the  subordination
provisions  irrespective of any amendment, modification or waiver of any term of
such Senior Indebtedness.
    
 
    The Indenture does  not limit  the aggregate amount  of Senior  Indebtedness
that  may  be  issued  by  Sierra  Pacific.  As  of  December  31,  1995, Senior
Indebtedness of Sierra Pacific aggregated approximately $463
 
                                       29
<PAGE>
million, substantially all  of which consists  of first mortgage  bonds or  debt
secured  by  first mortgage  bonds issued  under  Sierra Pacific's  Indenture of
Mortgage and which are secured  by a first lien  on substantially all of  Sierra
Pacific's real and personal property.
 
OPTIONAL REDEMPTION
 
   
    Sierra  Pacific  shall  have the  right  to redeem  the  Junior Subordinated
Debentures, in whole or in part, from time to  time, on or after June   ,  2001,
or  at any time in  certain circumstances upon the occurrence  of a Tax Event as
described under "Description of the Preferred Securities -- Tax Event Redemption
or Distribution," upon  not less than  30 nor more  than 60 days'  notice, at  a
redemption  price equal to 100% of the  principal amount to be redeemed plus any
accrued and unpaid interest, including Additional Interest (as herein  defined),
if  any,  to the  redemption  date. If  a  partial redemption  of  the Preferred
Securities resulting  from  a  partial redemption  of  the  Junior  Subordinated
Debentures  would result  in the delisting  of the  Preferred Securities, Sierra
Pacific may only redeem the Junior Subordinated Debentures in whole.
    
 
OPTION TO EXTEND INTEREST PAYMENT PERIOD
 
   
    Sierra Pacific shall  have the right  at any  time, during the  term of  the
Junior  Subordinated Debentures, to defer interest payments from time to time by
extending the interest payment  period for successive  periods not exceeding  20
consecutive quarters, at the end of which Extension Period, Sierra Pacific shall
pay  all interest then accrued and unpaid (including any Additional Interest, as
herein defined) together with interest thereon compounded quarterly at the  rate
specified  for the  Junior Subordinated  Debentures to  the extent  permitted by
applicable law ("Compound Interest"); PROVIDED,  that during any such  Extension
Period,  (a) Sierra  Pacific shall  not declare  or pay  dividends on,  make any
distribution with respect to, or redeem, purchase, acquire or make a liquidation
payment with respect to any  of its capital stock  (other than (i) purchases  or
acquisitions  of shares  of Sierra Pacific  Common Stock in  connection with the
satisfaction by Sierra  Pacific of  its obligations under  any employee  benefit
plans, (ii) as a result of a reclassification of Sierra Pacific capital stock or
the  exchange or conversion of  one class or series  of Sierra Pacific's capital
stock for another class or series of  Sierra Pacific capital stock or (iii)  the
purchase  of fractional  interests in shares  of Sierra  Pacific's capital stock
pursuant to the conversion or exchange provisions of such Sierra Pacific capital
stock or the security  being converted or exchanged),  (b) Sierra Pacific  shall
not  make any payment  of interest, principal  or premium, if  any, on or repay,
repurchase or redeem any debt securities issued by Sierra Pacific that rank PARI
PASSU with  or junior  to  the Junior  Subordinated  Debentures and  (c)  Sierra
Pacific  shall not  make any  guarantee payments  with respect  to the foregoing
(other than pursuant  to the Guarantee).  Prior to the  termination of any  such
Extension  Period,  Sierra Pacific  may further  defer  payments of  interest by
extending the interest payment period;  PROVIDED, HOWEVER, that, such  Extension
Period,  including all such  previous and further extensions,  may not exceed 20
consecutive quarters or extend  beyond the maturity  of the Junior  Subordinated
Debentures.  Upon the termination of any Extension Period and the payment of all
amounts then due, Sierra Pacific may commence a new Extension Period, subject to
the terms set  forth in this  section. No interest  during an Extension  Period,
except  at the  end thereof,  shall be  due and  payable. Sierra  Pacific has no
present intention  of exercising  its right  to defer  payments of  interest  by
extending  the interest payment period on the Junior Subordinated Debentures. If
the Institutional Trustee shall  be the sole holder  of the Junior  Subordinated
Debentures, Sierra Pacific shall give the Regular Trustees and the Institutional
Trustee  notice of its selection of such Extension Period one Business Day prior
to the earlier  of (i) the  date distributions on  the Preferred Securities  are
payable or (ii) the date the Regular Trustees are required to give notice to the
NYSE  (or other  applicable self-regulatory organization)  or to  holders of the
Preferred Securities  of  the record  date  or  the date  such  distribution  is
payable. The Regular Trustees shall give notice of Sierra Pacific's selection of
such  Extension  Period  to the  holders  of  the Preferred  Securities.  If the
Institutional Trustee shall not  be the sole holder  of the Junior  Subordinated
Debentures,  Sierra Pacific  shall give the  holders of  the Junior Subordinated
Debentures notice of its  selection of such Extension  Period ten Business  Days
prior  to the  earlier of (i)  the Interest Payment  Date or (ii)  the date upon
which Sierra Pacific is required to give notice to the NYSE (or other applicable
self-regulatory  organization)  or  to   holders  of  the  Junior   Subordinated
Debentures of the record or payment date of such related interest payment.
    
 
                                       30
<PAGE>
ADDITIONAL INTEREST
 
    If  at any time Sierra  Pacific Capital shall be  required to pay any taxes,
duties, assessments  or  governmental charges  of  whatever nature  (other  than
withholding  taxes) imposed by the United States, or any other taxing authority,
then, in  any  such  case,  Sierra  Pacific  will  pay  as  additional  interest
("Additional Interest") such additional amounts as shall be required so that the
net  amounts received  and retained by  Sierra Pacific Capital  after paying any
such taxes, duties, assessments or other  governmental charges will be not  less
than  the amounts Sierra Pacific Capital would  have received had no such taxes,
duties, assessments or other governmental charges been imposed.
 
CERTAIN COVENANTS
 
   
    If (i)  there  shall  have  occurred any  event  that  would  constitute  an
Indenture  Event of  Default or  (ii) Sierra  Pacific shall  be in  default with
respect to its payment of any  obligations under the Guarantee, then (a)  Sierra
Pacific  shall not declare or pay  dividends on, make distributions with respect
to, or redeem, purchase or acquire,  or make a liquidation payment with  respect
to, any of its capital stock (other than (i) purchases or acquisitions of shares
of  Sierra Pacific  common stock in  connection with the  satisfaction by Sierra
Pacific of its obligations under any employee benefit plans, (ii) as a result of
a reclassification  of  Sierra  Pacific's  capital  stock  or  the  exchange  or
conversion  of one class or  series of Sierra Pacific  capital stock for another
class or  series  of Sierra  Pacific  capital stock  or  (iii) the  purchase  of
fractional  interests in shares of Sierra  Pacific capital stock pursuant to the
conversion or exchange provisions  of such Sierra Pacific  capital stock or  the
security  being  converted or  exchanged) or  make  any guarantee  payments with
respect to the foregoing, and, (b) Sierra Pacific shall not make any payment  of
interest,  principal or premium, if  any, on or repay,  repurchase or redeem any
debt securities (including guarantees) issued  by Sierra Pacific that rank  PARI
PASSU with or junior to the Junior Subordinated Debentures.
    
 
    Sierra  Pacific will  covenant (i) to  directly or  indirectly maintain 100%
ownership of the  Common Securities of  the Trust; PROVIDED,  HOWEVER, that  any
permitted  successor of Sierra Pacific under the Indenture may succeed to Sierra
Pacific's ownership of  such Common Securities  and (ii) to  use its  reasonable
efforts  to cause the Trust (x) to  remain a statutory business trust, except in
connection with  the  distribution  of Junior  Subordinated  Debentures  to  the
holders  of Trust Securities in liquidation of  the Trust, the redemption of all
of the Trust  Securities of  the Trust,  or certain  mergers, consolidations  or
amalgamations,  each  as  permitted by  the  Declaration, and  (y)  to otherwise
continue to be classified  as a grantor trust  for United States federal  income
tax purposes.
 
CONSOLIDATION, MERGER AND SALE OF ASSETS
 
   
    The  Indenture provides  that Sierra  Pacific will  not consolidate  with or
merge into  any  other corporation  or  convey,  transfer or  lease  its  assets
substantially as an entirety unless (a) the successor is a corporation organized
in  the United States and expressly assumes  the due and punctual payment of the
principal of  (and premium,  if any)  and interest  on all  Junior  Subordinated
Debentures  issued thereunder and the performance of every other covenant of the
Indenture on  the part  of  Sierra Pacific  and  (b) immediately  thereafter  no
Indenture Event of Default and no event which, after notice or lapse of time, or
both,  would become an  Indenture Event of  Default, shall have  happened and be
continuing. Upon any  such consolidation,  merger, conveyance  or transfer,  the
successor  corporation shall  succeed to and  be substituted  for Sierra Pacific
under the Indenture and thereafter the predecessor corporation shall be relieved
of all obligations and covenants under the Indenture and the Junior Subordinated
Debentures.
    
 
INDENTURE EVENTS OF DEFAULT
 
   
    If any  Indenture  Event of  Default  shall  occur and  be  continuing,  the
Institutional Trustee, as the holder of the Junior Subordinated Debentures, will
have  the  right to  declare the  principal of  and the  interest on  the Junior
Subordinated  Debentures  (including  any   Compound  Interest  and   Additional
Interest,  if  any) and  any other  amounts  payable under  the Indenture  to be
forthwith due and payable  and to enforce  its other rights  as a creditor  with
respect  to the Junior Subordinated Debentures. See "-- Events of Default" below
for a
    
 
                                       31
<PAGE>
   
description of the Indenture  Events of Default. An  Indenture Event of  Default
also  constitutes  a  Declaration Event  of  Default. The  holders  of Preferred
Securities in certain circumstances have  the right to direct the  Institutional
Trustee  to  exercise  its  rights  as the  holder  of  the  Junior Subordinated
Debentures. See "Description of the  Preferred Securities -- Declaration  Events
of Default" and "Voting Rights."
    
 
    Notwithstanding  the foregoing, if  an Event of Default  has occurred and is
continuing and such event  is attributable to the  failure of Sierra Pacific  to
pay interest or principal on the Junior Subordinated Debentures on the date such
interest  or principal  is otherwise  payable, Sierra  Pacific acknowledges that
then a holder of Preferred Securities may institute a Direct Action for  payment
on  or  after  the respective  due  date  specified in  the  Junior Subordinated
Debentures. Notwithstanding  any  payment  made  to  such  holder  of  Preferred
Securities  in  connection with  a Direct  Action,  Sierra Pacific  shall remain
obligated to  pay  the principal  of  or  interest on  the  Junior  Subordinated
Debentures held by Sierra Pacific Capital or the Institutional Trustee of Sierra
Pacific  Capital, and Sierra  Pacific will be  subrogated to the  rights of such
holder of  Preferred  Securities  with  respect to  payments  on  the  Preferred
Securities  to the extent of any payments  made by Sierra Pacific to such holder
in any such Direct Action. The holders of Preferred Securities will not be  able
to  exercise directly any  other remedy available  to the holders  of the Junior
Subordinated Debentures.
 
BOOK-ENTRY AND SETTLEMENT
 
    If distributed to  holders of  Preferred Securities in  connection with  the
involuntary  or  voluntary  dissolution,  winding-up  or  liquidation  of Sierra
Pacific Capital  as a  result  of the  occurrence of  a  Tax Event,  the  Junior
Subordinated  Debentures  will be  issued  in the  form  of one  or  more global
certificates (each a "Global Security") registered in the name of the Depositary
or its nominee. Except under  the limited circumstances described below,  Junior
Subordinated   Debentures  represented  by  the  Global  Security  will  not  be
exchangeable for, and  will not  otherwise be issuable  as, Junior  Subordinated
Debentures  in definitive form. The Global Securities described above may not be
transferred except by  the depositary to  a nominee  of the depositary  or by  a
nominee of the depositary to the depositary or another nominee of the depositary
or to a successor depositary or its nominee.
 
    The laws of some jurisdictions require that certain purchasers of securities
take  physical delivery  of such  securities in  definitive form.  Such laws may
impair the ability to transfer beneficial interests in such a Global Security.
 
    Except as provided below,  owners of beneficial interests  in such a  Global
Security   will  not  be  entitled  to   receive  physical  delivery  of  Junior
Subordinated Debentures  in  definitive form  and  will not  be  considered  the
holders  (as  defined  in  the  Indenture) thereof  for  any  purpose  under the
Indenture, and no  Global Security representing  Junior Subordinated  Debentures
shall  be exchangeable, except for another  Global Security of like denomination
and tenor to be registered in the name of the Depositary or its nominee or to  a
successor  Depositary or  its nominee.  Accordingly, each  Beneficial Owner must
rely on the procedures of the Depositary or if such person is not a Participant,
on the procedures of the Participant through which such person owns its interest
to exercise any rights of a holder under the Indenture.
 
THE DEPOSITARY
 
   
    If Junior Subordinated  Debentures are distributed  to holders of  Preferred
Securities  in liquidation of such holders' interests in Sierra Pacific Capital,
DTC will act as  securities depositary for  the Junior Subordinated  Debentures.
For  a description of DTC and the specific terms of the depositary arrangements,
see "Description of the Preferred Securities -- Book-Entry Only Issuance --  The
Depositary  Trust Company." As  of the date of  this Prospectus, the description
therein of  DTC's  book-entry system  and  DTC's  practices as  they  relate  to
purchases,  transfers,  notices  and  payments  with  respect  to  the Preferred
Securities apply in all material respects to any debt obligations represented by
one or  more  Global  Securities held  by  DTC.  Sierra Pacific  may  appoint  a
successor  to DTC or any successor depositary in the event DTC or such successor
depositary is unable  or unwilling to  continue as a  depository for the  Global
Securities.
    
 
    So  long as  the Depositary for  a Global  Security, or its  nominee, is the
registered owner of such  Global Security, such Depositary  or such nominee,  as
the   case  may   be,  will   be  considered  the   sole  owner   or  holder  of
 
                                       32
<PAGE>
the Junior Subordinated Debentures represented  by such Global Security for  all
purposes  under the Indenture.  Except as set forth  below, owners of beneficial
interests in  a  Global  Security  will  not be  entitled  to  have  the  Junior
Subordinated  Debentures represented by such Global Security registered in their
names, will not  receive or  be entitled to  receive physical  delivery of  such
Junior Subordinated Debentures in definitive form and will not be considered the
owners or holders thereof under the Indenture. Accordingly, each person owning a
beneficial  interest in  a Global  Security must rely  on the  procedures of the
Depositary for such Global Security and, if such person is not a participant, on
the procedures of the participant through  which such person owns its  interest,
to  exercise  any  rights  of  a  holder  under  the  Indenture.  Sierra Pacific
understands that under existing industry  practices, if Sierra Pacific  requests
any  action of  holders or  if an  owner of  a beneficial  interest in  a Global
Security desires to give or take any  action which a holder is entitled to  give
or  take  under the  Indenture, the  Depositary for  such Global  Security would
authorize the participants holding the relevant beneficial interests to give  or
take such action, and such participants would authorize beneficial owners owning
through  such participants to  give or take  such action or  would otherwise act
upon the instructions of beneficial owners holding through them.
 
    Principal, premium, if any, and interest payments on the Junior Subordinated
Debentures represented  by  a  Global  Security registered  in  the  name  of  a
Depositary or its nominee will be made to such Depositary or its nominee, as the
case  may be, as  the registered owner  of such Global  Security. None of Sierra
Pacific, the Debt Trustee or any other  agent of Sierra Pacific or agent of  the
Debt  Trustee will have  any responsibility or  liability for any  aspect of the
records relating  to  or  payments  made  on  account  of  beneficial  ownership
interests  in such Global Security or  for maintaining, supervising or reviewing
any records relating to such beneficial ownership interests.
 
    Sierra Pacific  expects  that the  Depositary  for any  Junior  Subordinated
Debentures  represented by  a Global  Security, upon  receipt of  any payment of
principal, premium  or  interest  in  respect  of  such  Global  Security,  will
immediately credit participants' accounts with payments in amounts proportionate
to their respective beneficial interests in such Global Security as shown on the
records  of  such  Depositary.  Sierra Pacific  also  expects  that  payments by
participants to  owners of  beneficial interests  in such  Global Security  held
through such participants will be governed by standing customer instructions and
customary practices, and will be the responsibility of such participants.
 
   
DISCONTINUANCE OF THE DEPOSITARY'S SERVICES
    
 
    If  the Depositary for  any Junior Subordinated  Debentures represented by a
Global Security is at any time unwilling or unable to continue as Depositary  or
ceases  to  be  a clearing  agency  registered  under the  Exchange  Act,  and a
successor Depositary registered as a clearing  agency under the Exchange Act  is
not  appointed by Sierra Pacific within 90  days, Sierra Pacific will issue such
Junior Subordinated Debentures in  definitive form in  exchange for such  Global
Security. In addition, Sierra Pacific may at any time and in its sole discretion
determine  not to  have any  of the Junior  Subordinated Debentures  of a series
represented by one  or more  Global Securities and,  in such  event, will  issue
Junior Subordinated Debentures of such series in definitive form in exchange for
all  of the Global Security or  Securities representing such Junior Subordinated
Debentures. Any  Junior Subordinated  Debentures issued  in definitive  form  in
exchange  for a Global Security will be registered  in such name or names as the
Depositary shall  instruct  the  relevant  Trustee. It  is  expected  that  such
instructions  will  be based  upon directions  received  by the  Depositary from
participants with respect to  ownership of beneficial  interests in such  Global
Security.
 
EVENTS OF DEFAULT
 
   
    The  Indenture  provides that  any one  or more  of the  following described
events, which has occurred and is continuing, constitutes an "Event of  Default"
with  respect to the Junior Subordinated Debentures:  (i) failure for 30 days to
pay interest on  the Junior  Subordinated Debentures,  including any  Additional
Interest in respect thereof, when due; PROVIDED, HOWEVER, that a valid extension
of  the interest payment period by Sierra Pacific shall not constitute a default
in the payment of interest for this purpose; or (ii) failure to pay principal of
or premium, if any,  on the Junior Subordinated  Debentures when due whether  at
maturity,  upon redemption, by declaration or otherwise; PROVIDED, HOWEVER, that
a valid extension of the maturity  of such Junior Subordinated Debentures  shall
not  constitute  a default  for this  purpose;  or (iii)  failure to  observe or
    
 
                                       33
<PAGE>
perform any other covenant contained in the Indenture for 90 days after  notice;
or (iv) in the event Junior Subordinated Debentures are issued to the Trust or a
trustee  of such Trust  in connection with  the issuance of  Trust Securities by
such Trust, the voluntary or involuntary dissolution, winding up or  termination
of  the Trust, except in connection with the distribution of Junior Subordinated
Debentures to the holders  of Preferred Securities in  liquidation of the  Trust
upon  the redemption of  all outstanding Preferred  Securities and in connection
with  certain  mergers,  consolidations   or  amalgamations  permitted  by   the
Declaration;  or (v) certain events  in bankruptcy, insolvency or reorganization
of Sierra Pacific.
 
    The Debt  Trustee  or  the  holders  of  not  less  than  25%  in  aggregate
outstanding  principal amount of the  Junior Subordinated Debentures may declare
the principal of  and interest  on the  Junior Subordinated  Debentures due  and
payable immediately on the occurrence of an Event of Default; PROVIDED, HOWEVER,
that,  after  such  acceleration,  but  before a  judgment  or  decree  based on
acceleration, the  holders  of  a  majority in  aggregate  principal  amount  of
outstanding  Junior  Subordinated Debentures  may, under  certain circumstances,
rescind and annul  such acceleration if  all Events of  Default, other than  the
nonpayment  of accelerated principal,  have been cured or  waived as provided in
the Indenture. For information  as to waiver of  defaults, see "--  Modification
and Amendments of the Indenture."
 
    Notwithstanding  the  foregoing,  if  a  Declaration  Event  of  Default has
occurred and is  continuing and  such event is  attributable to  the failure  of
Sierra  Pacific  to  pay  interest  or  principal  on  the  Junior  Subordinated
Debentures on the date such interest  or principal is otherwise payable,  Sierra
Pacific  acknowledges that, in such event,  a holder of Preferred Securities may
institute a  Direct Action  for payment  on  or after  the respective  due  date
specified  in the Junior  Subordinated Debentures. Sierra  Pacific may not amend
the Indenture to remove the foregoing right to bring a Direct Action without the
prior written consent of all the  holders of Preferred Securities of the  Trust.
Notwithstanding  any  payment made  to such  holder  of Preferred  Securities by
Sierra Pacific in connection with a  Direct Action, Sierra Pacific shall  remain
obligated  to  pay  the principal  of  or  interest on  the  Junior Subordinated
Debentures held  by the  Trust or  the Institutional  Trustee of  the Trust  and
Sierra Pacific shall be subrogated to the rights of the holder of such Preferred
Securities with respect to payments on the Preferred Securities to the extent of
any  payments made by  Sierra Pacific to  such holder in  any Direct Action. The
holders of Preferred Securities will not be able to exercise directly any  other
remedy available to the holders of the Junior Subordinated Debentures.
 
    The  Holders  of  not  less  than a  majority  in  principal  amount  of the
outstanding Junior Subordinated  Debentures may waive  any past defaults  except
(a)  a default in payment of the principal  of (or premium, if any) or interest,
if any, on any Junior Subordinated Debentures and (b) a default in respect of  a
covenant  or  provision of  the Indenture  which cannot  be amended  or modified
without the  consent  of  the  holder of  each  Junior  Subordinated  Debenture;
PROVIDED,  HOWEVER, that if  the Junior Subordinated Debentures  are held by the
Trust or a trustee  of such Trust,  such waiver or  modification to such  waiver
shall not be effective until the holders of a majority in liquidation preference
of  Trust  Securities  of the  Trust  shall  have consented  to  such  waiver or
modification to such waiver; PROVIDED FURTHER, that if the consent of the holder
of each outstanding Junior Subordinated Debenture is required, such waiver shall
not be effective until each  holder of the Trust  Securities of the Trust  shall
have consented to such waiver.
 
    Notwithstanding  anything in the Indenture to the contrary, the right of any
holder of a Junior Subordinated Debenture to receive payment of the principal of
and interest  on  such Junior  Subordinated  Debt  Security, on  and  after  the
respective  due dates  expressed in such  Junior Subordinated  Debenture (as the
same may be extended  in accordance with the  terms of such Junior  Subordinated
Debenture),  or to institute suit for the  enforcement of any such payment shall
not be impaired or  affected without the consent  of such holder, including  the
holders of the Preferred Securities issued by Sierra Pacific Capital.
 
    A  default under any other indebtedness of Sierra Pacific or the Trust would
not constitute an Event of Default under the Junior Subordinated Debentures.
 
    Subject to the  provisions of the  Indenture relating to  the duties of  the
Debt Trustee in case an Event of Default shall occur and be continuing, the Debt
Trustee  will be  under no obligation  to exercise  any of its  rights or powers
under the  Indenture  at the  request  or direction  of  any holders  of  Junior
Subordinated  Debentures, unless  such holders  shall have  offered to  the Debt
Trustee satisfactory indemnity. Subject to
 
                                       34
<PAGE>
such provisions for the  indemnification of the Debt  Trustee, the holders of  a
majority  in aggregate  principal amount  of the  Junior Subordinated Debentures
then outstanding will have  the right to  direct the time,  method and place  of
conducting  any  proceeding for  any remedy  available to  the Debt  Trustee, or
exercising any trust or power conferred on the Debt Trustee with respect to such
series. The right of a holder of Preferred Securities to institute a  proceeding
with  respect  to  the  Indenture is  subject  to  certain  conditions precedent
including notice and indemnity to the Debt  Trustee, but the holder of a  Junior
Subordinated  Debenture has an absolute right  to receipt of principal, premium,
if any, and interest at the maturity of,  or, in the case of redemption, on  the
Redemption Date or to institute suit for the enforcement thereof.
 
    No  holder  of any  Junior  Subordinated Debenture  will  have any  right to
institute any  proceeding  with respect  to  the  Indenture or  for  any  remedy
thereunder,  unless such holder shall have  previously given to the Debt Trustee
written notice of a  continuing Event of  Default and, if the  Trust is not  the
sole  holder of Junior  Subordinated Debentures, unless the  holders of at least
25% in aggregate  principal amount  of the Junior  Subordinated Debentures  then
outstanding  shall  also  have  made  written  request,  and  offered reasonable
indemnity, to the Debt Trustee to institute such proceeding as Debt Trustee, and
the Debt Trustee  shall not  have received  from the  holders of  a majority  in
aggregate  principal amount of the  outstanding Junior Subordinated Debentures a
direction inconsistent with such request and shall have failed to institute such
proceeding within 60  days. However,  such limitations do  not apply  to a  suit
instituted  by a  holder of a  Junior Subordinated Debenture  for enforcement of
payment of the principal of or interest on such Junior Subordinated Debenture on
or after  the  respective  due  dates  expressed  in  such  Junior  Subordinated
Debenture.
 
    Sierra  Pacific is required to  file annually with the  Debt Trustee and the
Institutional  Trustee  a  certificate  as  to  whether  Sierra  Pacific  is  in
compliance with all the conditions and covenants under the Indenture.
 
MODIFICATIONS AND AMENDMENTS OF THE INDENTURE
 
    Modifications  and amendments to the Indenture may be made by Sierra Pacific
and the Debt Trustee with the consent of the holders of a majority in  principal
amount  of the Junior Subordinated Debentures at the time outstanding, PROVIDED,
that no such modification or amendment may, without the consent of the holder of
each Junior Subordinated Debenture affected thereby to: (i) modify the terms  of
payment of principal, premium, if any, or interest or (ii) reduce the percentage
of  holders of Junior  Subordinated Debentures necessary to  modify or amend the
Indenture or  waive compliance  by  Sierra Pacific  with  any covenant  or  past
default,  PROVIDED, FURTHER, that if the Junior Subordinated Debentures are held
by the Trust or a trustee of  such Trust, such supplemental indenture shall  not
be  effective until the holders of a majority in liquidation preference of Trust
Securities of the  Trust shall  have consented to  such supplemental  indenture;
PROVIDED  FURTHER, that if the consent of  the holder of each outstanding Junior
Subordinated Debenture is  required, such  supplemental indenture  shall not  be
effective  until each  holder of  the Trust Securities  of the  Trust shall have
consented to such supplemental indenture.
 
SETOFF
 
    Notwithstanding anything contained to the contrary in the Indenture,  Sierra
Pacific  shall have the right to set off  any payment with respect to the Junior
Subordinated Debentures it is otherwise required to make thereunder with and  to
the  extent Sierra Pacific has theretofore made,  or is concurrently on the date
of such payment making, a payment under the Guarantee.
 
GOVERNING LAW
 
    The Indenture and the  Junior Subordinated Debentures  will be governed  by,
and construed in accordance with, the internal laws of the State of New York.
 
   
MISCELLANEOUS
    
 
    The  Indenture  will  provide that  Sierra  Pacific  will pay  all  fees and
expenses related to  (i) the  offering of the  Trust Securities  and the  Junior
Subordinated  Debentures, (ii) the organization,  maintenance and dissolution of
Sierra Pacific Capital, (iii) the retention of the Regular Trustees and (iv) the
enforcement by the  Institutional Trustee of  the rights of  the holders of  the
Preferred  Securities. The payment of  such fees and expenses  will be fully and
unconditionally guaranteed by Sierra Pacific. Sierra Pacific will have the right
at all times to assign any of its rights or obligations under the Indenture to a
direct or indirect wholly owned
 
                                       35
<PAGE>
subsidiary  of  Sierra  Pacific;  provided  that,  in  the  event  of  any  such
assignment,  Sierra Pacific will remain liable for all such obligations. Subject
to the foregoing, the Indenture will be binding upon and inure to the benefit of
the parties thereto and their  respective successors and assigns. The  Indenture
provides  that it may not otherwise be assigned by the parties thereto. The Debt
Trustee, prior  to  default, undertakes  to  perform  only such  duties  as  are
specifically  set forth in the Indenture  and, after default, shall exercise the
same degree of care as a prudent individual would exercise in the conduct of his
or her own  affairs. Subject to  such provision,  the Debt Trustee  is under  no
obligation  to exercise any of  the powers vested in it  by the Indenture at the
request  of  any  holder  of  Junior  Subordinated  Debentures,  unless  offered
satisfactory   indemnity  by  such  holder   against  the  costs,  expenses  and
liabilities which might be incurred thereby. The Debt Trustee is not required to
expend or risk its own funds or otherwise incur personal financial liability  in
the  performance  of its  duties if  the Debt  Trustee reasonably  believes that
repayment or adequate indemnity is not reasonably assured to it.
 
                        EFFECT OF OBLIGATIONS UNDER THE
                JUNIOR SUBORDINATED DEBENTURES AND THE GUARANTEE
 
    As set forth in the Declaration, the sole purpose of Sierra Pacific  Capital
is  to issue the  Trust Securities evidencing  undivided beneficial interests in
the assets  of Sierra  Pacific Capital,  and to  invest the  proceeds from  such
issuance and sale in the Junior Subordinated Debentures.
 
   
    As  long as payments of interest and other payments are made when due on the
Junior Subordinated  Debentures,  such  payments will  be  sufficient  to  cover
distributions  and payments due on the Trust Securities because of the following
factors: (i) the  aggregate principal amount  of Junior Subordinated  Debentures
will be equal to the sum of the aggregate stated liquidation amount of the Trust
Securities;  (ii) the interest rate and the  interest and other payment dates on
the  Junior  Subordinated  Debentures  will  match  the  distribution  rate  and
distribution  and  other  payment  dates  for  the  Preferred  Securities; (iii)
pursuant to the Indenture Sierra Pacific shall pay all, and the Trust shall  not
be  obligated  to pay,  directly or  indirectly, any  costs, expenses,  debt and
obligations of the Trust (other than with respect to the Trust Securities);  and
(iv)  the Declaration further provides that  the Regular Trustees shall not take
or cause or permit Sierra Pacific Capital to, among other things, engage in  any
activity that is not consistent with the purposes of Sierra Pacific Capital.
    
 
   
    Payments  of distributions (to the extent  funds therefor are available) and
other payments due on the Preferred Securities (to the extent funds therefor are
available) are  fully  and unconditionally  guaranteed  by Sierra  Pacific.  See
"Description  of  the  Guarantee."  If Sierra  Pacific  does  not  make interest
payments on the Junior Subordinated Debentures purchased by the Trust, the Trust
will not  pay  distributions on  the  Preferred  Securities and  will  not  have
sufficient  funds  available  therefor.  The  Guarantee  is  a  guarantee  on  a
subordinated basis with respect to the Preferred Securities issued by the  Trust
from the time of its issuance and does not apply to any payment of distributions
unless  and  until  the Trust  has  sufficient  funds for  the  payment  of such
distributions.
    
 
   
    The Guarantee covers the payment of distributions and other payments on  the
Preferred  Securities only if and  to the extent that  Sierra Pacific has made a
payment of interest or principal on  the Junior Subordinated Debentures held  by
the  Trust as  its sole  asset. The Guarantee,  when taken  together with Sierra
Pacific's obligations under  the Junior Subordinated  Debentures, the  Indenture
and the Declaration, including its obligations to pay costs, expenses, debts and
liabilities  of the  Trust (other  than with  respect to  the Trust Securities),
provides a full  and unconditional  guarantee of  amounts due  on the  Preferred
Securities.
    
 
    If  Sierra Pacific fails  to make interest  or other payments  on the Junior
Subordinated Debentures when due (taking  account of any Extension Period),  the
Declaration   provides  a  mechanism  whereby   the  holders  of  the  Preferred
Securities, using  the procedures  described in  "Description of  the  Preferred
Securities -- Book-Entry Only Issuance -- The Depository Trust Company" and " --
Voting Rights," may direct the Institutional Trustee to enforce its rights under
the  Junior  Subordinated  Debentures.  If the  Institutional  Trustee  fails to
enforce its  rights  under  the  Junior Subordinated  Debentures,  a  holder  of
Preferred  Securities may institute a legal proceeding against Sierra Pacific to
enforce the Institutional Trustee's rights under the
 
                                       36
<PAGE>
Junior Subordinated Debentures  without first instituting  any legal  proceeding
against the Institutional Trustee or any other person or entity. Notwithstanding
the  foregoing, if a Declaration Event of Default has occurred and is continuing
and such event is attributable to the failure of Sierra Pacific to pay  interest
or  principal on the Junior Subordinated Debentures on the date such interest or
principal is otherwise payable (or in  the case of redemption on the  redemption
date),  then a holder of Preferred Securities  may institute a Direct Action for
payment on or after the respective due date specified in the Junior Subordinated
Debentures. In  connection  with such  Direct  Action, Sierra  Pacific  will  be
subrogated  to  the rights  of  such holder  of  Preferred Securities  under the
Declaration to the extent of any payment  made by Sierra Pacific to such  holder
of  Preferred  Securities  in  such Direct  Action.  Sierra  Pacific,  under the
Guarantee, acknowledges that the Guarantee  Trustee shall enforce the  Guarantee
on behalf of the holders of the Preferred Securities. If Sierra Pacific fails to
make  payments under the  Guarantee, the Guarantee  provides a mechanism whereby
the holders of  the Preferred  Securities may  direct the  Guarantee Trustee  to
enforce  its rights thereunder. Any holder of Preferred Securities may institute
a legal proceeding  directly against  Sierra Pacific to  enforce such  Preferred
Guarantee  Trustee's right to receive payment  under the Guarantee without first
instituting a legal  proceeding against  Sierra Pacific  Capital, the  Guarantee
Trustee, or any other person or entity.
 
    Sierra  Pacific  and  the  Trust  believe  that  the  above  mechanisms  and
obligations, taken  together,  provide a  full  and unconditional  guarantee  by
Sierra  Pacific of payments due on the Preferred Securities. See "Description of
Guarantee -- General."
 
                                       37
<PAGE>
                     UNITED STATES FEDERAL INCOME TAXATION
 
GENERAL
 
    In  the  opinion  of  Choate,  Hall  &  Stewart  (a  partnership   including
professional  corporations),  counsel  to  Sierra Pacific  and  the  Trust ("Tax
Counsel"), the following is a summary  of certain of the material United  States
federal  income tax consequences  of the purchase,  ownership and disposition of
Preferred Securities.  Unless otherwise  stated, this  summary deals  only  with
Preferred  Securities  held  as  capital  assets  by  holders  who  purchase the
Preferred Securities upon  original issuance  ("Initial Holders").  It does  not
deal  with  special  classes of  holders  such  as banks,  thrifts,  real estate
investment trusts, regulated investment companies, insurance companies,  dealers
in securities or currencies, tax-exempt investors, or persons that will hold the
Preferred  Securities as  a position  in a "straddle,"  as part  of a "synthetic
security" or "hedge," as part of a "conversion transaction" or other  integrated
investment, or as other than a capital asset. This summary also does not address
the  tax consequences to persons that have  a functional currency other than the
U.S. Dollar or the tax  consequences to shareholders, partners or  beneficiaries
of  a  holder  of  Preferred  Securities.  Further,  it  does  not  include  any
description of any alternative minimum tax  consequences or the tax laws of  any
state or local government or of any foreign government that may be applicable to
the  Preferred Securities. This summary is based on the Internal Revenue Code of
1986,  as   amended   (the   "Code"),  Treasury   regulations   thereunder   and
administrative  and judicial interpretations thereof, as of the date hereof, all
of which are subject to change, possibly on a retroactive basis.
 
CLASSIFICATION OF THE JUNIOR SUBORDINATED DEBENTURES
 
    Based on  the advice  of Tax  Counsel, Sierra  Pacific intends  to take  the
position  that the Junior Subordinated Debentures  will be classified for United
States federal  income tax  purposes  as indebtedness  of Sierra  Pacific  under
current  law, and, by acceptance of  a Preferred Security, each holder covenants
to treat the Junior  Subordinated Debentures as  indebtedness and the  Preferred
Securities  as  evidence of  an indirect  beneficial  ownership interest  in the
Junior Subordinated Debentures. No  assurance can be  given, however, that  such
position  of  Sierra Pacific  will  not be  challenged  by the  Internal Revenue
Service or, if  challenged, that such  a challenge will  not be successful.  The
remainder  of this  discussion assumes  that the  Junior Subordinated Debentures
will be classified  for United  States income  tax purposes  as indebtedness  of
Sierra Pacific.
 
CLASSIFICATION OF SIERRA PACIFIC POWER CAPITAL I
 
    In  connection with  the issuance of  the Preferred  Securities, Tax Counsel
will render its opinion generally to the effect that, under then current law and
assuming full compliance  with the terms  of the Declaration  and the  Indenture
(and  certain  other  documents), and  based  on certain  facts  and assumptions
contained in such opinion, Sierra Pacific Capital will be classified for  United
States  federal income tax purposes as a grantor trust and not as an association
taxable as  a corporation.  Accordingly, for  United States  federal income  tax
purposes,  each holder of Preferred Securities  generally will be considered the
owner of  an  undivided interest  in  the Junior  Subordinated  Debentures,  and
pursuant  to  the  agreement  to treat  the  Junior  Subordinated  Debentures as
indebtedness, each holder will  be required to include  in its gross income  any
OID  accrued with  respect to its  allocable share of  those Junior Subordinated
Debentures.
 
ORIGINAL ISSUE DISCOUNT
 
    Because Sierra  Pacific  has the  option,  under  the terms  of  the  Junior
Subordinated  Debentures, to  defer payments  of interest  by extending interest
payment periods for up to  20 quarters, all of  the stated interest payments  on
the Junior Subordinated Debentures will be treated as "original issue discount."
Holders of debt instruments issued with OID must include that discount in income
on  an economic  accrual basis  before the receipt  of cash  attributable to the
interest, regardless of  their method  of tax  accounting. Generally,  all of  a
holder's  taxable  interest  income  with  respect  to  the  Junior Subordinated
Debentures will be  accounted for  as OID,  and actual  distributions of  stated
interest  will not be separately  reported as taxable income.  The amount of OID
that accrues in any  month will approximately equal  the amount of the  interest
that  accrues on the Junior Subordinated Debentures  in that month at the stated
interest rate. In the event that the
 
                                       38
<PAGE>
interest payment  period  is  extended,  holders will  continue  to  accrue  OID
approximately  equal to the amount of the interest payment due at the end of the
extended interest payment period on an economic accrual basis over the length of
the extended interest period.
 
    Because income on  the Preferred Securities  will constitute OID,  corporate
holders  of Preferred  Securities will not  be entitled  to a dividends-received
deduction with respect to  any income recognized with  respect to the  Preferred
Securities.
 
MARKET DISCOUNT AND BOND PREMIUM
 
    Holders of Preferred Securities other than Initial Holders may be considered
to have acquired their undivided interests in the Junior Subordinated Debentures
with  market discount  or acquisition  premium as  such phrases  are defined for
United States federal income tax purposes.  Such holders are advised to  consult
their  tax  advisors  as to  the  income  tax consequences  of  the acquisition,
ownership and disposition of the Preferred Securities.
 
RECEIPT OF JUNIOR SUBORDINATED DEBENTURES OR CASH UPON LIQUIDATION OF SIERRA
PACIFIC POWER CAPITAL I
 
    Under certain circumstances, as described under the caption "Description  of
the  Preferred  Securities  --  Tax Event  Redemption  or  Distribution," Junior
Subordinated Debentures  may  be distributed  to  holders in  exchange  for  the
Preferred Securities and in liquidation of Sierra Pacific Capital. Under current
law,  such a distribution, for United  States federal income tax purposes, would
be treated as a non-taxable event to each holder, and each holder would  receive
an  aggregate  tax basis  in the  Junior Subordinated  Debentures equal  to such
holder's aggregate tax  basis in  its Preferred Securities.  A holder's  holding
period  in  the Junior  Subordinated Debentures  so  received in  liquidation of
Sierra Pacific  Capital would  include  the period  during which  the  Preferred
Securities were held by such holder. If, however, the related special event is a
Tax  Event which results in the Trust being treated as an association taxable as
a corporation,  the distribution  would  likely constitute  a taxable  event  to
holders of the Preferred Securities.
 
    Under  certain  circumstances  described  herein  (see  "Description  of the
Preferred Securities"), the Junior Subordinated  Debentures may be redeemed  for
cash and the proceeds of such redemption distributed to holders in redemption of
their  Preferred Securities.  Under current  law, such  a redemption  would, for
United States federal income tax  purposes, constitute a taxable disposition  of
the  redeemed Preferred Securities, and a holder could recognize gain or loss as
if it  sold such  redeemed Preferred  Securities for  cash. See  "United  States
Federal Income Taxation -- Sales of Preferred Securities."
 
SALES OF PREFERRED SECURITIES
 
    A  holder that sells Preferred Securities  will recognize gain or loss equal
to the difference between its adjusted tax basis in the Preferred Securities and
the amount  realized  on the  sale  of  such Preferred  Securities.  A  holder's
adjusted  tax basis  in the Preferred  Securities generally will  be its initial
purchase price increased  by OID  previously includible in  such holder's  gross
income  to the  date of  disposition and decreased  by payments  received on the
Preferred Securities. Such gain or loss generally will be a capital gain or loss
and generally  will  be  a long-term  capital  gain  or loss  if  the  Preferred
Securities have been held for more than one year.
 
    The  Preferred  Securities may  trade at  a price  that does  not accurately
reflect the value of accrued but unpaid interest with respect to the  underlying
Junior   Subordinated  Debentures.  A  holder  who  disposes  of  his  Preferred
Securities between record dates  for payments of  distributions thereon will  be
required  to  include accrued  but unpaid  interest  on the  Junior Subordinated
Debentures through the date of disposition in income as ordinary income, and  to
add  such  amount  to his  adjusted  tax basis  in  his  pro rata  share  of the
underlying Junior Subordinated Debentures deemed disposed of. To the extent  the
selling  price is less than the holder's adjusted tax basis (which will include,
in the form of OID, all accrued  but unpaid interest) a holder will recognize  a
capital  loss. Subject to  certain limited exceptions,  capital losses cannot be
applied to offset ordinary income for United States federal income tax purposes.
 
                                       39
<PAGE>
PROPOSED TAX LEGISLATION
 
    On March  19,  1996, President  Clinton  proposed the  Proposed  Legislation
which,  among other things,  would generally deny  corporate issuers a deduction
for interest in respect of certain debt obligations issued on or after  December
7,  1995 if such debt obligations have a  maximum term in excess of twenty years
and are  not  shown as  indebtedness  on the  issuer's  applicable  consolidated
balance  sheet. On March 29, 1996, the Senate Finance Committee Chairman and the
House Ways and Means  Committee Chairman issued  the Joint Statement  indicating
their  intent  that  certain  legislative  proposals  initiated  by  the Clinton
administration including the Proposed Legislation, that may be adopted by either
of the tax-writing committees of Congress  would have an effective date that  is
no  earlier than the date of  "appropriate Congressional action." Based upon the
Joint Statement, it  is expected  that if the  Proposed Legislation  were to  be
enacted, such legislation would not apply to the Junior Subordinated Debentures.
There  can be no assurances, however, that the effective date guidance contained
in the Joint Statement  will be incorporated into  the Proposed Legislation,  if
enacted,  or  that other  legislation  enacted after  the  date hereof  will not
otherwise adversely affect the ability of Sierra Pacific to deduct the  interest
payable  on the  Junior Subordinated  Debentures. Accordingly,  there can  be no
assurance that a  Tax Event will  not occur. See  "Description of the  Preferred
Securities -- Tax Event Redemption or Distribution."
 
UNITED STATES ALIEN HOLDERS
 
    For  purposes  of this  discussion, a  "United States  Alien Holder"  is any
corporation, individual, partnership, estate or trust that is, as to the  United
States,  a  foreign  corporation,  a non-resident  alien  individual,  a foreign
partnership, or a non-resident fiduciary of a foreign estate or trust.
 
    Under present United States federal income  tax law: (i) payments by  Sierra
Pacific  Capital  or any  of  its paying  agents to  any  holder of  a Preferred
Security who or which  is a United  States Alien Holder will  not be subject  to
United  States federal withholding tax; provided  that, (a) the beneficial owner
of the Preferred Security does not actually or constructively own 10% or more of
the total  combined voting  power of  all  classes of  stock of  Sierra  Pacific
entitled  to vote, (b) the  beneficial owner of the  Preferred Security is not a
controlled foreign corporation that is  related to Sierra Pacific through  stock
ownership,  and (c)  either (A) the  beneficial owner of  the Preferred Security
certifies to Sierra Pacific  Capital or its agent,  under penalties of  perjury,
that it is not a United States holder and provides its name and address or (B) a
securities clearing organization, bank or other financial institution that holds
customers'  securities  in  the ordinary  course  of  its trade  or  business (a
"Financial Institution"), and  holds the  Preferred Security  in such  capacity,
that  certifies  to Sierra  Pacific  Capital or  its  agent, under  penalties of
perjury, that such statement has been  received from the beneficial owner by  it
or  by a Financial Institution between it and the beneficial owner and furnishes
Sierra Pacific Capital  or its  agent with  a copy  thereof; and  (ii) a  United
States Alien Holder of a Preferred Security will not be subject to United States
federal  withholding tax on any gain realized upon the sale or other disposition
of a Preferred Security.
 
INFORMATION REPORTING TO HOLDERS
 
    Generally, income on the Preferred Securities will be reported to holders on
Forms 1099-OID, which forms should be mailed to holders of Preferred  Securities
by January 31 following each calendar year.
 
BACKUP WITHHOLDING
 
    Payments  made on, and  proceeds from the sale  of, the Preferred Securities
may be subject to a "backup" withholding  tax of 31% unless the holder  complies
with  certain identification requirements. Any  withheld amounts will be allowed
as a credit against the holder's United States federal income tax, provided  the
required information is provided to the Service.
 
    THE  UNITED STATES FEDERAL INCOME TAX DISCUSSION SET FORTH ABOVE IS INCLUDED
FOR GENERAL INFORMATION ONLY AND MAY NOT BE APPLICABLE DEPENDING UPON A HOLDER'S
PARTICULAR SITUATION. HOLDERS SHOULD CONSULT THEIR TAX ADVISORS WITH RESPECT  TO
THE  TAX CONSEQUENCES TO THEM OF THE  PURCHASE, OWNERSHIP AND DISPOSITION OF THE
PREFERRED SECURITIES, INCLUDING THE TAX CONSEQUENCES UNDER STATE, LOCAL, FOREIGN
AND OTHER TAX LAWS AND THE POSSIBLE EFFECTS OF CHANGES IN UNITED STATES  FEDERAL
OR OTHER TAX LAWS.
 
                                       40
<PAGE>
                              PLAN OF DISTRIBUTION
 
    Subject  to the terms and conditions  set forth in an underwriting agreement
(the "Underwriting Agreement"),  the Trust  has agreed to  sell to  each of  the
underwriters named below (the "Underwriters"), and each of the Underwriters, for
whom Merrill Lynch & Co. and Merrill, Lynch, Pierce, Fenner & Smith Incorporated
are  acting as  representative (the  "Representative"), has  severally agreed to
purchase the number of Preferred Securities  set forth opposite its name  below.
In  the Underwriting Agreement, the several Underwriters have agreed, subject to
the terms and  conditions set forth  therein, to purchase  all of the  Preferred
Securities  offered hereby  if any  of the  Preferred Securities  are purchased,
provided that, under certain circumstances relating to a default of one or  more
Underwriters, less than all of such Preferred Securities may be purchased.
 
<TABLE>
<CAPTION>
                                                                                NUMBER OF
                                                                                PREFERRED
                               UNDERWRITER                                      SECURITIES
- --------------------------------------------------------------------------  ------------------
<S>                                                                         <C>
Merrill Lynch, Pierce, Fenner & Smith Incorporated........................
Dean Witter Reynolds Inc..................................................
A.G. Edwards & Sons, Inc..................................................
Legg Mason Wood Walker Incorporated.......................................
 
                                                                                 ----------
    Total.................................................................        1,940,000
                                                                                 ----------
                                                                                 ----------
</TABLE>
 
    The  Underwriters propose to offer the Preferred Securities in part directly
to the public at the  initial public offering price, as  set forth on the  cover
page of this Prospectus, and in part to certain securities dealers at such price
less a concession of $.[   ] per Preferred Security. The Underwriters may allow,
and  such  dealers may  reallow, a  concession  not in  excess of  $.[     ] per
Preferred  Security  to  certain  brokers  and  dealers.  After  the   Preferred
Securities  are released for  sale to the  public, the offering  price and other
selling terms may from time to time be varied by the Representative.
 
    In view  of  the  fact that  the  proceeds  of the  sale  of  the  Preferred
Securities will be used to purchase the Junior Subordinated Debentures of Sierra
Pacific,  the Underwriting Agreement provides that  Sierra Pacific will agree to
pay as compensation ("Underwriters' Compensation")  to the Underwriters for  the
Underwriters'  arranging the investment  therein of such  proceeds, an amount in
New York Clearing House (next day) funds of $[     ] per Preferred Security  (or
$[           ]  in the aggregate) for the  accounts of the several Underwriters,
provided that such compensation for sales of 10,000 or more Preferred Securities
to any single purchaser will be $[      ] per Preferred Security. Therefore,  to
the  extent of such sales, the  actual amount of Underwriters' Compensation will
be less than the aggregate amount specified in the preceding sentence.
 
    During a period of  30 days from  the date of the  pricing of the  Preferred
Securities, neither the Trust nor Sierra Pacific will, without the prior written
consent  of the  Representative, directly  or indirectly,  sell, offer  to sell,
contract to sell, grant any option for the sale of, or otherwise dispose of, any
Preferred Securities,  any security  convertible into  or exchangeable  into  or
exercisable  for Preferred Securities  or the Junior  Subordinated Debentures or
any debt securities substantially similar to the Junior Subordinated  Debentures
or  any  equity securities  substantially  similar to  the  Preferred Securities
(except for the Junior Subordinated Debentures and the Preferred Securities).
 
    An application  has been  filed with  the New  York Stock  Exchange for  the
listing  of the Preferred Securities, subject to official notice of issuance. If
approved   for    listing,   trading    of   the    Preferred   Securities    on
 
                                       41
<PAGE>
the New York Stock Exchange is expected to commence within a 30 day period after
the  date of this Prospectus. The Representative  has advised the Trust that the
Underwriters intend to make  a market in the  Preferred Securities prior to  the
commencement  of trading on  the New York Stock  Exchange. The Underwriters will
have no obligation to  make a market in  the Preferred Securities, however,  and
may cease market making activities, if commenced, at any time.
 
    Prior  to this offering, there  has been no public  market for the Preferred
Securities. In order to meet one  of the requirements for listing the  Preferred
Securities  on the New  York Stock Exchange, the  Underwriters will undertake to
sell to a minimum of 400 beneficial holders.
 
    Sierra Pacific  and the  Trust  have agreed  to indemnify  the  Underwriters
against,  or to contribute to payments that  the Underwriters may be required to
make in  respect  of,  certain  liabilities,  including  liabilities  under  the
Securities Act.
 
    Certain  of the Underwriters engage in  transactions with, and, from time to
time, have performed  services for,  Sierra Pacific  in the  ordinary course  of
business.
 
                                 LEGAL MATTERS
 
    The  validity of  the Preferred Securities,  Junior Subordinated Debentures,
the Guarantee and  certain matters  relating thereto and  certain United  States
federal  income  taxation matters  will be  passed upon  for Sierra  Pacific and
Sierra Pacific  Capital  by Choate,  Hall  & Stewart  (a  partnership  including
professional  corporations), Boston,  Massachusetts, counsel  to Sierra Pacific.
Matters of local law are being passed upon by Woodburn and Wedge, special Nevada
counsel for Sierra Pacific,  by Graham & James  LLP, special California  counsel
for  Sierra Pacific,  and with  respect to  certain matters  of Delaware  law by
Skadden, Arps,  Slate, Meagher  &  Flom, special  counsel to  the  Underwriters.
Choate,  Hall & Stewart has relied upon the opinions of such other counsel as to
such matters. Certain legal matters will be passed upon for the Underwriters  by
Ropes & Gray, Boston, Massachusetts.
 
                            INDEPENDENT ACCOUNTANTS
 
    The  balance sheets and statements of capitalization of Sierra Pacific as of
December 31, 1995 and 1994, and  the statements of income, common  shareholders'
equity  and cash flows for each of the  three years in the period ended December
31, 1995, incorporated by reference  in this Prospectus, have been  incorporated
by  reference in reliance on the report of Coopers & Lybrand L.L.P., independent
accountants, given on  the authority  of that firm  as experts  in auditing  and
accounting.
 
    Any  financial statements and schedules  hereafter incorporated by reference
in the registration statement of which the  Prospectus is a part that have  been
audited  and are the subject  of a report by  independent accountants will be so
incorporated by reference in reliance upon  such reports and upon the  authority
of  such firm  as experts in  accounting and  auditing to the  extent covered by
consents filed with the Commission.
 
   
                             ADDITIONAL INFORMATION
    
 
   
    With respect to the unaudited  interim financial information of the  Company
for  the  period  ended  March  31,  1996,  incorporated  by  reference  in this
prospectus, the independent  accountants have  reported that  they have  applied
limited  procedures in  accordance with professional  standards for  a review of
such information. However,  their reports  included in  the Company's  quarterly
report  on  Form  10-Q  for  the  quarterly  period  ended  March  31,  1996 and
incorporated by reference herein, state that they did not audit and they do  not
express  an  opinion on  that  interim financial  information.  Accordingly, the
degree of reliance on their report  on such information should be restricted  in
light  of the limited  nature of the review  procedures applied. The accountants
are not subject to the liability provisions  of Section 11 of the Act for  their
reports on the unaudited interim financial information because those reports are
not  "reports" or "parts" of the registration statement prepared or certified by
the accountants within the meaning of Sections 7 and 11 of the Act.
    
 
                                       42
<PAGE>
- -------------------------------------------
                                     -------------------------------------------
- -------------------------------------------
                                     -------------------------------------------
 
    NO  DEALER, SALESPERSON OR OTHER INDIVIDUAL  HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR  TO  MAKE  ANY  REPRESENTATIONS OTHER  THAN  THOSE  CONTAINED  OR
INCORPORATED  BY REFERENCE IN THIS PROSPECTUS  IN CONNECTION WITH THE OFFER MADE
BY THIS PROSPECTUS  AND, IF GIVEN  OR MADE, SUCH  INFORMATION OR  REPRESENTATION
MUST  NOT  BE RELIED  UPON AS  HAVING  BEEN AUTHORIZED  BY SIERRA  PACIFIC POWER
COMPANY, SIERRA  PACIFIC  POWER CAPITAL  I,  OR THE  UNDERWRITERS.  NEITHER  THE
DELIVERY  OF  THIS  PROSPECTUS  NOR  ANY SALE  MADE  HEREUNDER  SHALL  UNDER ANY
CIRCUMSTANCE CREATE AN IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE  AFFAIRS
OF SIERRA PACIFIC POWER COMPANY OR SIERRA PACIFIC POWER CAPITAL I SINCE THE DATE
HEREOF.  THIS PROSPECTUS DOES NOT CONSTITUTE  AN OFFER OR SOLICITATION BY ANYONE
IN ANY STATE IN WHICH SUCH OFFER  OR SOLICITATION IS NOT AUTHORIZED OR IN  WHICH
THE  PERSON MAKING SUCH  OFFER OR SOLICITATION IS  NOT QUALIFIED TO  DO SO OR TO
ANYONE TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR SOLICITATION.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
Available Information..........................           4
Incorporation of Certain Documents by
 Reference.....................................           4
Sierra Pacific Power Company Selected
 Historical Financial Information..............           6
Sierra Pacific Power Company...................           8
Sierra Pacific Power Capital I.................           9
Risk Factors...................................          10
Accounting Treatment...........................          13
Use of Proceeds................................          13
Description of the Preferred Securities........          14
Description of the Guarantee...................          25
Description of the Junior Subordinated
 Debentures....................................          27
Effect of Obligations Under the Junior
 Subordinated Debentures and the Guarantee.....          36
United States Federal Income Taxation..........          38
Plan of Distribution...........................          41
Legal Matters..................................          42
Independent Accountants........................          42
Additional Information.........................          42
</TABLE>
    
 
                                   1,940,000
                              PREFERRED SECURITIES
 
                              SIERRA PACIFIC POWER
                                   CAPITAL I
 
                                % TRUST ORIGINATED
                         PREFERRED SECURITIES ("TOPRS")
                  GUARANTEED TO THE EXTENT SET FORTH HEREIN BY
 
                                 SIERRA PACIFIC
                                 POWER COMPANY
 
                             ---------------------
 
                             PROSPECTUS SUPPLEMENT
 
                             ---------------------
 
                              MERRILL LYNCH & CO.
                           DEAN WITTER REYNOLDS INC.
                           A.G. EDWARDS & SONS, INC.
                             LEGG MASON WOOD WALKER
                                  INCORPORATED
 
   
                                 JUNE   , 1996
    
 
- -------------------------------------------
                                     -------------------------------------------
- -------------------------------------------
                                     -------------------------------------------
<PAGE>
                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

Securities and Exchange Commission Registration Fee..................  $16,725
New York Stock Exchange Listing Fee..................................   14,750*
Nevada Commission Fee................................................      200
California Commission Fee............................................    5,203
Rating Agency Fees...................................................   22,665*
Blue Sky Fees and Expenses...........................................    7,000*
Trustee's Expenses...................................................   12,000*
Printing Fees and Expenses...........................................   40,000*
Accounting Fees and Expenses.........................................   14,000*
Legal Fees and Expenses..............................................  149,500*
Miscellaneous Expenses...............................................    7,957*

Total Expenses....................................................... $290,000*
_______________________________
* Estimated

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

    The Nevada Revised statutes provide that under certain circumstances, a 
corporation may indemnify any person for amounts incurred in connection with 
a pending or threatened action, suit or proceeding in which he is, or is 
threatened to be made, a party by reason of his being a director, officer, 
employee or agent of the Corporation.

    The Articles of Incorporation of Sierra Pacific provide in substance that 
Sierra Pacific will indemnify each of its directors and officers and former 
directors and officers against expenses necessarily incurred in connection 
with the defense of any action, suit or proceeding in which he or she is made 
a party by reason of being or having been a director or officer of Sierra 
Pacific, except in relation to matters as to which he or she shall be 
adjudged liable for negligence or misconduct.

    Sierra Pacific has purchased insurance coverage under a policy insuring 
directors and officers of Sierra Pacific against certain liabilities which 
they may incur in their capacity as such.

    The Declaration of the Sierra Pacific Trust provides that no Sierra 
Pacific Trustee, affiliate of the Sierra Pacific Trustee, or any officers, 
directors, shareholders, members, partners, employees, representatives or 
agents of any Sierra Pacific Trustee, or any employee or agent of the Sierra 
Pacific Trust or its affiliates (each an "Indemnified Person") shall be 
liable, responsible or accountable in damages or otherwise to the Sierra 
Pacific Trust or any employee or agent of the Trust or its affiliates for any 
loss, damage or claim incurred by reason of any act or omission performed or 
omitted by such Indemnified Person in good faith on behalf of the Sierra 
Pacific Trust and in a manner such Indemnified Person reasonably believed to 
be within the scope of the authority conferred on such Indemnified Person by 
the Declaration or by law, except that an Indemnified Person shall be liable 
for any such loss,

                                    II-1

<PAGE>

damage or claim incurred by reason of such Indemnified Person's negligence or 
willful misconduct withrespect to such acts or omissions.  The Declaration of 
the Sierra Pacific Trust also provides that to the fullest extent permitted 
by applicable law, Sierra Pacific shall indemnify and hold harmless each 
Indemnified Person from and against any loss, damage or claim incurred by 
such Indemnified Person by reason of any act or omission performed or omitted 
by such Indemnified Person in good faith on behalf of the Sierra Pacific 
Trust and in a manner such Indemnified Person reasonably believed to be 
within the scope of authority conferred on such Indemnified Person by such 
Declaration, except that no Indemnified Person shall be entitled to be 
indemnified in respect of any loss, damage or claim incurred by such 
Indemnified Person by reason of the negligence of such Indemnified Person or 
willful misconduct with respect to such acts or omissions.  The Declaration 
of the Sierra Pacific Trust further provides that, to the fullest extent 
permitted by applicable law, expenses (including legal fees) incurred by an 
Indemnified Person in defending any claim, demand, action, suit or proceeding 
shall, from time to time, be advanced by Sierra Pacific prior to the final 
disposition of such claim, demand, action, suit or proceeding upon receipt by 
or an undertaking by or on behalf of the Indemnified Person to repay such 
amount if it shall be determined that the Indemnified Person is not entitled 
to be indemnified for the underlying cause of action as authorized by the 
Declaration.

    The directors and officers of Sierra Pacific and the Regular Trustees are 
covered by insurance policies indemnifying against certain liabilities, 
including certain liabilities arising under the Securities Act of 1933, as 
amended, which might be incurred by them in such capacities and against which 
they cannot be indemnified by Sierra Pacific or the Sierra Pacific Trust.

    Any agents, dealers or underwriters who execute any of the agreements 
filed as Exhibit I to this registration statement will agree to indemnify 
Sierra Pacific's directors and their officers and the Sierra Pacific Trustees 
who signed the registration statement against certain liabilities that may 
arise under the Securities Act of 1993, as amended, with respect to 
information furnished to Sierra Pacific or the Sierra Pacific Trust by or on 
behalf of any such indemnifying party.

    See "Item 17.  Undertakings." for a description of the Securities and 
Exchange Commission's position regarding such indemnification provisions.

ITEM 16.  EXHIBITS.

    See Index to Exhibits immediately preceding the Exhibits included as part 
of this Registration Statement.

ITEM 17.  UNDERTAKING.

    The Registrants hereby undertake that, for purposes of determining any 
liability under the Securities Act, each filing of Sierra Pacific's Annual 
Report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange 
Act of 1934, as amended (the "Exchange Act") (and where applicable, each 
filing of an employee benefit plan's annual report pursuant to Section 15(d) 
of the Exchange Act) 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.

    Insofar as indemnification for liabilities arising under the Securities 
Act may be permitted to directors, officers and controlling persons of the 
Registrants pursuant to the provisions referred to in Item 15

                                    II-2

<PAGE>


(other than the insurance policies referred to therein), 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 
the Registrants 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 their 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.

The Registrants hereby undertake:

(1)  To file, during any period in 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;

     (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 Commission 
           pursuant to Rule 424(b) if, in the aggregate, the changes in 
           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 the undertakings set forth in paragraphs (i) and (ii) 
above do not apply if the information required to be included in a post 
effective amendment by those paragraphs is contained in periodic reports 
filed by Sierra Pacific pursuant to Section 13 or Section 15(d) of the 
Exchange Act that are incorporated by reference in this Registration 
Statement.

(2)  That, for the purpose of determining any liability under the Securities 
     Act, 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. 

The Registrants hereby undertake that:


                                    II-3

<PAGE>


(1)  For purposes of determining any liability under the Securities Act, the 
     information omitted from the form of prospectus filed as part of a 
     registration statement in reliance upon Rule 430A and contained in the 
     form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or 
     (4) or 497(h) under the Securities Act shall be deemed to be part of the 
     registration statement as of the time it was declared effective. 

(2)  For the purposes of determining any liability under the Securities Act, 
     each post-effective amendment that contains a form of prospectus 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.


                                    II-4


<PAGE>

                                  SIGNATURES

    Pursuant to the requirements of the Securities Act of 1933, the 
Registrant certifies that it has reasonable grounds to believe that it meets 
the requirements for filing on Form S-3 and has duly caused this Registration 
Statement to be signed on its behalf by the undersigned, thereunto duly 
authorized in the City of Reno, State of Nevada, on May 31, 1996.

                                   SIERRA PACIFIC POWER COMPANY



                                   By:  /s/ Walter M. Higgins
                                      ----------------------------
                                      (Walter M. Higgins)
                                      CHAIRMAN, PRESIDENT 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 and on the dates indicated.

    SIGNATURE                        TITLE                       DATE
    ---------                        -----                       ----

/s/ Walter M. Higgins         Chairman, President and         May 31, 1996
- -------------------------     Chief Executive Officer
Walter M. Higgins             (Principal Executive Officer)
                              and Director

Malyn K. Malquist*            Senior Vice President, Chief    May 31, 1996
- -------------------------     Financial Officer (Principal
Malyn K. Malquist             Financial Officer) (Principal
                              Accounting Officer)


Edward P. Bliss*              Director                        May 31, 1996
- -------------------------
Edward P. Bliss

Krestine M. Corbin*           Director                        May 31, 1996
- -------------------------
Krestine M. Corbin

Theodore J. Day*              Director                        May 31, 1996
- -------------------------
Theodore J. Day

Harold P. Dayton, Jr.*        Director                        May 31, 1996
- -------------------------
Harold P. Dayton, Jr.

James R. Donnelley*           Director                        May 31, 1996
- -------------------------
James R. Donnelley

Richard N. Fulstone*          Director                        May 31, 1996
- -------------------------
Richard N. Fulstone




                                    II-5

<PAGE>


James L. Murphy*              Director                        May 31, 1996
- -------------------------
James L. Murphy

Ronald K. Remington*          Director                        May 31, 1996
- -------------------------
Ronald K. Remington

Dennis E. Wheeler*            Director                        May 31, 1996
- -------------------------
Dennis E. Wheeler

Robert B. Whittington*        Director                        May 31, 1996
- -------------------------
Robert B. Whittington

* By /s/ Malyn K. Malquist
    ------------------------
    Malyn K. Malquist
    Attorney-in-Fact

                                  SIGNATURES

    Pursuant to the requirements of the Securities Act of 1933, Sierra 
Pacific Power Capital I certifies that it has reasonable grounds to believe 
that it meets all the requirements for filing on Form S-3 and has duly caused 
this Registration Statement to be signed on its behalf by the undersigned, 
thereunto duly authorized, in the City of Reno, State of Nevada, on the 31st 
day of May, 1996.

                              SIERRA PACIFIC POWER CAPITAL I


                              By: /s/ Malyn K. Malquist
                                 ----------------------------
                                 Malyn K. Malquist, Trustee


                              By: /s/ William E. Peterson
                                 ----------------------------
                                 William E. Peterson, Trustee



                                    II-6


<PAGE>

                                INDEX TO EXHIBITS



EXHIBIT NO.       DESCRIPTION
- -----------       -----------


*1          -    Form of Underwriting Agreement for offering of Preferred 
                 Securities. 

*4-A        -    Certificate of Trust of Sierra Pacific Power Capital I.

*4-B-1      -    Declaration of Trust of Sierra Pacific Power Capital I.

*4-B-2      -    Form of Amended and Restated Declaration of Trust of Sierra 
                 Pacific Power Capital I.

*4-C        -    Form of Indenture among Sierra Pacific Power Company and IBJ 
                 Schroder Bank & Trust Company, as Trustee.

*4-D        -    Form of Supplemental Indenture to Indenture to be used in 
                 connection with the issuance of Junior Subordinated 
                 Debentures and Preferred Securities.

*4-E        -    Form of Preferred Security (included in 4-B-2 above).

*4-F        -    Form of Junior Subordinated Debenture (included in 4-D above).

*4-G        -    Form of Guarantee with respect to Preferred Securities.

*5-A        -    Opinion of Choate, Hall & Stewart.

*5-B        -    Opinion of Woodburn and Wedge.

*5-C        -    Opinion of Graham & James L.L.P.

*5-D        -    Opinion of Skadden, Arps, Slate, Meager & Flom.

*8-A        -    Opinion of Choate, Hall & Stewart 

 12         -    Computations of Ratio of Earnings to Fixed Charges of Sierra 
                 Pacific Power Company and Ratio of Earnings to Fixed Charges 
                 and Preferred Dividends of Sierra Pacific Power Company.

15          -    Letter concerning unaudited interim financial information
                 from Independent Accountants, Coopers & Lybrand L.L.P.

 23-A       -    Consent of Independent Accountants, Coopers & Lybrand L.L.P.

*23-B       -    Consent of Choate, Hall & Stewart (included in Exhibit 5-A).

*23-C       -    Consent of Woodburn and Wedge (included in Exhibit 5-B).

*23-D       -    Consent of Graham & James L.L.P. (included in Exhibit 5-C).

*23-E       -    Consent of Skadden, Arps, Slate, Meager & Flom (included in 
                 Exhibit 5-D).

*24         -    Powers of Attorney.



                                    II-7

<PAGE>

EXHIBIT NO.       DESCRIPTION
- -----------       -----------

*25-A       -    Form T-1 Statement of Eligibility under the Trust Indenture 
                 Act of 1939, as amended of IBJ Schroder Bank & Trust 
                 Company, as Trustee under the Indenture.

*25-B       -    Form T-1 Statement of Eligibility under the Trust Indenture 
                 Act of 1939, as amended of IBJ Schroder Bank & Trust 
                 Company, as Trustee under the Amended and Restated 
                 Declaration of Trust of Sierra Pacific Power Capital I.

*25-C       -    Form T-1 Statement of Eligibility under the Trust Indenture 
                 Act of 1939, as amended, of IBJ Schroder Bank & Trust 
                 Company, as Trustee of the Preferred Securities Guarantees 
                 of Sierra Pacific Power Company for the benefit of the 
                 holders of Preferred securities of Sierra Pacific Power 
                 Capital I.

____________________________

* Previously filed.



                                    II-8



<PAGE>

                         SIERRA PACIFIC POWER COMPANY
                      RATIO OF EARNINGS TO FIXED CHARGES
                           (DOLLARS IN TH0USANDS)

<TABLE>
<CAPTION>

                                                                                                  TWELVE MONTHS
                                                                                                  ENDED MARCH 31,
EARNINGS                                    1991        1992       1993        1994        1995        1996
- --------                                    ----        ----       ----        ----        ----   ---------------
<S>                                         <C>         <C>        <C>         <C>         <C>     <C>

   Income After Interest Charges           $50,224    $49,843    $57,457     $60,863      $65,983      $68,836
   Deferral Mechanism Adjustments  (1,2)        $0     $1,050      ($409)         $2        ($552)       ($534)
                                          --------   --------   --------    --------     --------     --------
   Adjusted Income                         $50,224    $50,893    $57,048     $60,865      $65,431      $68,302

   Income Taxes, Operating                  24,810     26,029     27,499      29,113       37,370       40,242

   Income Taxes, Non-Operating                (390)      (787)       301         751         (231)        (239)

   Fixed Charges                   (1,2)    46,095     41,975     43,823      43,493       40,326       39,987
                                          --------   --------   --------    --------     --------     --------

         Earnings Available
          for Fixed Charges               $120,739   $118,110   $128,671    $134,222     $142,896     $148,292
                                          --------   --------   --------    --------     --------     --------
                                          --------   --------   --------    --------     --------     --------

FIXED CHARGES
- -------------

   Interest on Long-Term Debt      (1)     $39,331    $37,184    $39,091     $35,193      $35,326      $35,025
   Deferred Mechanism Adjustments               $0      ($980)      $459         $52         $554         $512
                                          --------   --------   --------    --------     --------     --------
   Adjusted Interest                       $39,331    $36,204    $39,550     $35,245      $35,880      $35,537

   Amortization of Debt Discount
     and Expenses, Less Premium                549        680      1,001       1,247        1,225        1,224

   Other Interest Expense          (2)       3,482      2,528        822       4,386          556          668
   Deferred Mechanism Adjustments                0        (70)       (50)        (54)          (2)          22
                                          --------   --------   --------    --------     --------     --------
   Adjusted Interest                         3,482      2,458        772       4,534          554          690

   Interest Compounded
     of all Rental Charges                   2,733      2,633      2,500       2,467        2,667        2,536
                                          --------   --------   --------    --------     --------     --------

         Total Fixed Charges               $46,095    $41,975    $43,823     $43,493      $40,326      $39,987
                                          --------   --------   --------    --------     --------     --------
                                          --------   --------   --------    --------     --------     --------

RATIO OF EARNINGS
  TO FIXED CHARGES                            2.62       2.81       2.94        3.09          3.54        3.71
                                          --------   --------   --------    --------     --------     --------
                                          --------   --------   --------    --------     --------     --------

</TABLE>

(1) Adjusted for the deferral portion of the variable rate interest deferral 
    mechanism.

(2) Adjusted for the carrying charges on the variable rate interest deferral 
    mechanism.



<PAGE>


                         SIERRA PACIFIC POWER COMPANY
       RATIO OF EARNINGS TO FIXED CHARGES AND PREFERRED STOCK DIVIDENDS
                           (DOLLARS IN TH0USANDS)

<TABLE>
<CAPTION>

                                                                                                  TWELVE MONTHS
                                                                                                  ENDED MARCH 31,
EARNINGS                                    1991        1992       1993        1994        1995        1996
- --------                                    ----        ----       ----        ----        ----   ---------------
<S>                                         <C>         <C>        <C>         <C>         <C>     <C>

   Income After Interest Charges           $50,224    $49,843    $57,457     $60,863      $65,983      $68,836
   Deferral Mechanism Adjustments  (1,2)        $0     $1,050      ($409)         $2        ($552)       ($534)
                                          --------   --------   --------    --------     --------     --------
   Adjusted Income                         $50,224    $50,893    $57,048     $60,865      $65,431      $68,302

   Income Taxes, Operating                  24,810     26,029     27,499      29,113       37,370       40,242

   Income Taxes, Non-Operating                (390)      (787)       301         751         (231)        (239)

   Fixed Charges                   (1,2)    46,095     41,975     43,823      43,493       40,326       39,987
                                          --------   --------   --------    --------     --------     --------

   Earnings Available
    for Fixed Charges/Preferred Dividends $120,739   $118,110   $128,671    $134,222     $142,896     $148,292
                                          --------   --------   --------    --------     --------     --------
                                          --------   --------   --------    --------     --------     --------

FIXED CHARGES/PREFERRED DIVIDENDS
- ---------------------------------

   Interest on Long-Term Debt      (1)     $39,331    $37,184    $39,091     $35,193      $35,326      $35,025
   Deferred Mechanism Adjustments               $0      ($980)      $459         $52         $554         $512
                                          --------   --------   --------    --------     --------     --------
   Adjusted Interest                       $39,331    $36,204    $39,550     $35,245      $35,880      $35,537

   Amortization of Debt Discount
     and Expenses, Less Premium                549        680      1,001       1,247        1,225        1,224

   Other Interest Expense          (2)       3,482      2,528        822       4,588          556          668
   Deferred Mechanism Adjustments                0        (70)       (50)        (54)          (2)          22
                                          --------   --------   --------    --------     --------     --------
   Adjusted Interest                         3,482      2,458        772       4,534          554          690

   Interest Compounded
     of all Rental Charges                   2,733      2,633      2,500       2,467        2,667        2,536

   Preferred Dividends             (3)       6,481      8,496     12,258      11,827       11,325       11,437
                                          --------   --------   --------    --------     --------     --------

         Total Fixed Charges/              $52,576    $50,471    $56,081     $55,320      $51,851      $51,424
          Preferred Dividends             --------   --------   --------    --------     --------     --------
                                          --------   --------   --------    --------     --------     --------

RATIO OF EARNINGS
  TO FIXED CHARGES/PREFERRED DIVIDENDS        2.30       2.34       2.29        2.43         2.76         2.86
                                          --------   --------   --------    --------     --------     --------
                                          --------   --------   --------    --------     --------     --------

</TABLE>

(1) Adjusted for the deferral portion of the variable rate interest deferral 
    mechanism.

(2) Adjusted for the carrying charges on the variable rate interest deferral 
    mechanism.

(3) Preferred Stock Dividend Requirements (100% Tax Rate).




<PAGE>
                                                                   EXHIBIT 15
                      [Coopers & Lybrand Letterhead]


                                     May 31, 1996

Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, D.C. 20549

                   Re:  SIERRA PACIFIC POWER COMPANY
                       REGISTRATION STATEMENT ON FORM S-3

We are aware that our report dated April 26, 1996 on our review of the 
interim financial information of Sierra Pacific Power Company for the period 
ended March 31, 1996 and included in the Company's quarterly report on 
Form 10-Q is incorporated by reference in the registration statement on 
Form S-3 of Sierra Pacific Resources for the Company's 1,940,000 shares of 
Trust Originated Preferred Securities. Pursuant to Rule 436(c) under the 
Securities Act of 1933, this report should not be considered a part of the 
registration statement prepared or certified by us within the meaning of 
Sections 7 and 11 of that Act.

                                     Very truly yours,

                                     /s/ Coopers & Lybrand L.L.P.

<PAGE>
                                                             EXHIBIT 23-A
                     [Coopers & Lybrand Letterhead]


                                     May 31, 1996

Choate, Hall & Stewart
53 State Street
Boston, Ma., 02109



Enclosed is our manually signed consent letter for our audit of the 
consolidated financial statements of Sierra Pacific Power Company as of 
December 31, 1995 and 1994, and for each of the three years in the period 
ending December 31, 1995 and 1994. Also, enclosed is our awareness letter for 
our review of the interim consolidated financial statements of Sierra Pacific 
Power Company for the period ended March 31, 1996.

Our manually signed report serves to authorize the use of our name on our 
consent and awareness letters in the electronic filing of the Company's 
Form S-3 for the issuance of 1,940,000 shares of Trust Originated Preferred 
Stock with the SEC.

Please provide us with an exact copy of the entire document as electronically 
filed with the SEC.

                                     Very truly yours,

                                     /s/ Coopers & Lybrand L.L.P.



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