SIERRA PACIFIC POWER CO
424B4, 1996-07-26
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>
PROSPECTUS
                                                Filed Pursuant to Rule 424(b)(4)
                                                              Reg. No. 333-04032
 
                         1,940,000 PREFERRED SECURITIES
 
                         SIERRA PACIFIC POWER CAPITAL I
         8.60% TRUST ORIGINATED PREFERRED SECURITIES-SM- ("TOPRS-SM-")
                (LIQUIDATION AMOUNT $25 PER PREFERRED SECURITY)
                    FULLY AND UNCONDITIONALLY GUARANTEED BY
 
                          SIERRA PACIFIC POWER COMPANY
                               ------------------
 
    The 8.60% 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 8.60% Junior Subordinated Debentures
due  July  30,  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.
 
    The  Preferred Securities  have been  approved for  listing on  the New York
Stock Exchange,  Inc.  (the "NYSE")  subject  to official  notice  of  issuance.
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 July 29, 1996.
 
(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  $.7875  per  Preferred   Security  (or  $1,527,750  in  the
    aggregate); provided, that  such compensation  for sales of  10,000 or  more
    Preferred  Securities  to  a single  purchaser  will be  $.50  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 July  29,
1996.
                            ------------------------
 
MERRILL LYNCH & CO.
             DEAN WITTER REYNOLDS INC.
                          A.G. EDWARDS & SONS, INC.
                                                          LEGG MASON WOOD WALKER
                                                            INCORPORATED
                            ------------------------
 
                 THE DATE OF THIS PROSPECTUS IS JULY 24, 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  8.60% 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  (a)  Sierra Pacific's
obligation to  make  interest and  other  payments on  the  Junior  Subordinated
Debentures  issued to the  Trust and (b) 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 $523  million
at  July  24, 1996,  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  8.60%  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 July 30, 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
 
                                       2
<PAGE>
amount of the Junior  Subordinated Debentures so redeemed  at $25 per  Preferred
Security  plus accrued and 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 July 30,  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;
 
        2.  Quarterly Report on Form 10-Q for the quarter ended March 31,  1996;
    and
 
        3.  Current Report on Form 8-K dated July 3, 1996.
 
                                       4
<PAGE>
    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.
 
    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>
                                      TWELVE 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................    $  600,658    $  597,784  $  603,193  $  521,568  $  476,769  $  462,153
  Operating Income..................       103,712       101,811      95,983      90,562      84,823      86,330
  Interest Charges (Excluding
   AFUDC)...........................        36,918        37,107      41,027      40,914      40,392      43,362
  Net Income........................        68,836        65,983      60,863      57,457      49,843      50,224
  Preferred Stock Dividend
   Requirements.....................    $    7,234    $    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.......................          3.49(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>
 
                                       6
<PAGE>
 
<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%    $    602,877        46.6%
Company-obligated mandatorily redeemable preferred securities of
 subsidiary Sierra Pacific Power Capital I (all of the assets of
 the Trust will be 8.60% Junior Subordinated Debentures due July
 30, 2036 of Sierra Pacific with a principal amount of
 $50,000,000, and upon redemption of such debt, the Preferred
 Securities will be mandatorily redeemable)......................       --              0.0           48,500         3.7
Preferred Stock..................................................        73,115         6.0           73,115         5.6
Preferred Stock Subject to Mandatory Redemption (5)..............        20,400         1.6                          0.0
Common Shareholders' Equity......................................       570,712        46.5          570,712        44.1
                                                                   ------------       -----     ------------       -----
  Total..........................................................  $  1,227,104       100.0%    $  1,295,204       100.0%
                                                                   ------------       -----     ------------       -----
                                                                   ------------       -----     ------------       -----
Short-Term Debt..................................................  $     50,000                 $          0
</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.
(2)  The pro forma  ratios give  effect to the  interest payable  on the  Junior
     Subordinated  Debentures at an annual rate  of 8.60% and the application of
     the proceeds as described in "Use of Proceeds".
(3)  Also reflects (i) 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%,
     (ii) the  issuance on  July 12,  1996 of  $10,000,000 principal  amount  of
     Medium-Term  Notes, Series C at an annual interest rate of 6.86%, and (iii)
     the  issuance  on  July  16,  1996  of  $20,000,000  principal  amount   of
     Medium-Term  Notes, Series C at  an annual interest rate  of 6.83%. The net
     proceeds 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)  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
citis 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  provided  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. Although the  merger
had  received all of the necessary approvals from the shareholders of Resources,
Sierra Pacific and WWP  and from six state  utility commissions, the merger  was
still under review by the Federal Energy Regulatory Commission when, on June 28,
1996,  WWP notified  Resources and  Sierra Pacific  that it  was terminating the
Merger Agreement in accordance with its terms. As a result of the termination of
the Merger Agreement,  Sierra Pacific  will continue  to operate  as a  separate
utility.
 
    The  principal executive offices of Sierra  Pacific are located at 6100 Neil
Road, P.O. Box 10100, Reno, Nevada 89520, telephone (702) 689-4011.
 
RECENT DEVELOPMENTS
 
    On July 17, 1996, Resources reported  second quarter net income of 49  cents
per  share of common stock  versus 37 cents for the  same period last year. When
adjusted for non-utility  and one-time  items, net income  was up  by 2  percent
compared  to the  same quarter  in 1995.  Resources also  reported that expenses
related to the  proposed merger with  WWP had been  substantially recognized  in
earnings in prior periods, with the impact to second quarter earnings limited to
final expenses associated with the cessation of merger activities.
 
                                       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  July 24, 1996,
Senior Indebtedness aggregated approximately $523 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  filed  under  the  Exchange  Act,  with  the
Preferred Securities shown as a separate line item on the balance sheet entitled
"Company-obligated  mandatorily-redeemable  preferred  securities  of subsidiary
Trust  holding  solely  junior  subordinated  debentures".  In  addition,   such
consolidated  financial  statements  of  Sierra  Pacific  will  include footnote
disclosure that  the  sole assets  of  the  Trust are  the  Junior  Subordinated
Debentures,  specifying the  interest rate,  principal amount  and maturity date
thereof and  whether treatment  under Staff  Accounting Bulletin  53 is  sought.
Finally,  upon occasions  when audited financial  statements are  required to be
filed under the Exchange Act, Sierra Pacific will include, in a footnote to  its
audited  consolidated  financial statements,  disclosure that  (i) the  Trust is
wholly-owned, (ii) the  sole assets  of the  Trust are  the Junior  Subordinated
Debentures  (specifying the interest rate,  principal amount and maturity date),
and (iii) the  back-up undertakings,  in the  aggregate, constitute  a full  and
unconditional  guarantee by Sierra Pacific of  the Trust's obligations under the
Preferred Securities.
 
                                       13
<PAGE>
                                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 July 24, 1996,  the total outstanding  short-term
debt of Sierra Pacific was $64 million with an average interest rate of 5.7%
 
                    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 8.60%  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  8.60% thereof  compounded  quarterly  (to  the extent
permitted
 
                                       14
<PAGE>
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 July 29, 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.  Distributions
payable in the first payment period will be computed on the basis of 61 days.
 
    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
 
                                       15
<PAGE>
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.
 
MANDATORY REDEMPTION
 
    The  Junior Subordinated Debentures will mature on July 30, 2036, and may be
redeemed, in whole or in part, at any time on or after July 30, 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
 
                                       16
<PAGE>
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 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
 
                                       17
<PAGE>
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  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.
 
                                       18
<PAGE>
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
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.
 
                                       19
<PAGE>
    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.
 
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
 
                                       20
<PAGE>
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.
 
    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
 
                                       21
<PAGE>
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 "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
 
                                       22
<PAGE>
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 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.
 
                                       23
<PAGE>
    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
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.
 
                                       24
<PAGE>
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 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
 
                                       25
<PAGE>
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  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
 
                                       26
<PAGE>
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 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
 
                                       27
<PAGE>
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.
 
    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
July 30, 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  8.60%
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
 
                                       28
<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 "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.
 
                                       29
<PAGE>
    The  Indenture does  not limit the  aggregate amount  of Senior Indebtedness
that may be issued by Sierra Pacific.  As of July 24, 1996, Senior  Indebtedness
of  Sierra Pacific aggregated  approximately $523 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 July 30, 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 and the Declaration 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  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.  In the  event  of  default by  an  Underwriter,  the
Underwriting  Agreement provides  that, in  certain circumstances,  the purchase
commitments  of  the  nondefaulting  Underwriters   may  be  increased  or   the
Underwriting Agreement may be terminated.
 
<TABLE>
<CAPTION>
                                                                                NUMBER OF
             UNDERWRITER                                                        PREFERRED
             ----------                                                         SECURITIES
                                                                            ------------------
<S>                                                                         <C>
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated....................................................          485,000
Dean Witter Reynolds Inc..................................................          485,000
A.G. Edwards & Sons, Inc..................................................          485,000
Legg Mason Wood Walker Incorporated.......................................          485,000
                                                                                 ----------
           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  $.50 per Preferred Security.  The Underwriters may allow,
and such dealers may reallow, a concession  not in excess of $.35 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 Underwriters.
 
    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  of
$.7875  per Preferred Security (or $1,527,750 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 $.50 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  Underwriters, 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).
 
    The  Preferred Securities  have been  approved for  listing on  the New York
Stock Exchange, subject to official notice of issuance. Trading of the Preferred
Securities on the New York  Stock Exchange is expected  to commence within a  30
day  period after the date of this Prospectus. The Underwriters have 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.
 
                                       41
<PAGE>
    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>
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    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................................          14
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
 
                             8.60% TRUST ORIGINATED
                       PREFERRED SECURITIESSM ("TOPRSSM")
                    FULLY AND UNCONDITIONALLY GUARANTEED BY
 
                                 SIERRA PACIFIC
                                 POWER COMPANY
 
                             ---------------------
 
                                   PROSPECTUS
 
                             ---------------------
 
                              MERRILL LYNCH & CO.
                           DEAN WITTER REYNOLDS INC.
                           A.G. EDWARDS & SONS, INC.
                             LEGG MASON WOOD WALKER
                                  INCORPORATED
 
                                 JULY 24, 1996
 
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