PACIFICORP /OR/
424B3, 1996-06-07
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>
Filed Pursuant to Rule 424(b)(3)
Registration Number 333-03357
 
             PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JUNE 5, 1996
 
                         8,680,000 PREFERRED SECURITIES
                              PACIFICORP CAPITAL I
  8 1/4% CUMULATIVE QUARTERLY INCOME PREFERRED SECURITIES, SERIES A (QUIPSSM)*
              (LIQUIDATION PREFERENCE $25 PER PREFERRED SECURITY)
 GUARANTEED TO THE EXTENT PACIFICORP CAPITAL I HAS FUNDS AS SET FORTH HEREIN BY
 
                                     [LOGO]
                              -------------------
 
    The  8 1/4% Cumulative Quarterly Income  Preferred Securities, Series A (the
"Series A Preferred Securities"),
offered hereby  represent  undivided  beneficial  interests  in  the  assets  of
PacifiCorp  Capital I, a trust  created under the laws  of the State of Delaware
("PacifiCorp Capital I"). PacifiCorp, an Oregon corporation ("PacifiCorp"), will
be the owner of all of the beneficial interests represented by common securities
of PacifiCorp Capital I ("Series A Common Securities"). The Bank of New York  is
the  Property Trustee of  PacifiCorp Capital I. PacifiCorp  Capital I exists for
the sole purpose of issuing the Series  A Preferred Securities and the Series  A
Common Securities and investing the
 
                                                        (CONTINUED ON NEXT PAGE)
                              -------------------
 
    SEE  "RISK FACTORS"  BEGINNING ON  PAGE S-4  HEREOF FOR  CERTAIN INFORMATION
RELEVANT TO AN INVESTMENT IN THE SERIES A PREFERRED SECURITIES.
                               -----------------
 
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 SUPPLEMENT OR THE  PROSPECTUS
      TO  WHICH  IT  RELATES. ANY  REPRESENTATION  TO THE  CONTRARY  IS A
                               CRIMINAL OFFENSE.
                              -------------------
 
<TABLE>
<CAPTION>
                                                                                                               PROCEEDS TO
                                                                      INITIAL PUBLIC       UNDERWRITING         PACIFICORP
                                                                      OFFERING PRICE      COMMISSION(1)      CAPITAL I(2)(3)
                                                                    ------------------  ------------------  ------------------
<S>                                                                 <C>                 <C>                 <C>
Per Series A Preferred Security...................................        $25.00               (2)                $25.00
Total.............................................................     $217,000,000            (2)             $217,000,000
</TABLE>
 
- -------
(1) PacifiCorp Capital  I and PacifiCorp  have agreed to  indemnify the  several
    Underwriters  against certain  liabilities, including  liabilities under the
    Securities Act of 1933, as amended. See "Underwriting."
(2) In view of the fact that the proceeds of the sale of the Series A  Preferred
    Securities   will  be  used  to  purchase   the  Series  C  Debentures,  the
    Underwriting  Agreement   provides  that   PacifiCorp   will  pay   to   the
    Underwriters,  as  compensation  ("Underwriters'  Compensation")  for  their
    arranging the  investment therein  of such  proceeds, $0.7875  per Series  A
    Preferred  Security; PROVIDED,  that such  compensation will  be $0.5000 per
    Series A Preferred Security sold  to certain institutions. Accordingly,  the
    maximum  aggregate amount of Underwriters'  Compensation will be $6,835,500,
    but the actual amount of Underwriters'  Compensation will be less than  such
    amount  to the extent  that Series A  Preferred Securities are  sold to such
    institutions. See "Underwriting."
(3) Expenses of the offering, which are payable by PacifiCorp, are estimated  to
    be $400,000.
                              -------------------
 
    The  Series A 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 the Series A  Preferred Securities will be  ready for delivery in
book-entry form only through the facilities  of The Depository Trust Company  in
New  York, New  York, on  or about  June 11,  1996, against  payment therefor in
immediately available funds.
- -------
*QUIPS is a servicemark of Goldman, Sachs & Co.
 
GOLDMAN, SACHS & CO.                                           SMITH BARNEY INC.
 
DEAN WITTER REYNOLDS INC.
 
                        A.G. EDWARDS & SONS, INC.
 
                                                             MERRILL LYNCH & CO.
                                  ------------
 
            The date of this Prospectus Supplement is June 6, 1996.
<PAGE>
    IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR  EFFECT
TRANSACTIONS  WHICH  STABILIZE OR  MAINTAIN  THE MARKET  PRICE  OF THE  SERIES A
PREFERRED SECURITIES AT A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN  THE
OPEN MARKET. SUCH TRANSACTIONS MAY BE EFFECTED ON THE NEW YORK STOCK EXCHANGE OR
OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
                              -------------------
 
(CONTINUED FROM PREVIOUS PAGE)
 
proceeds  thereof in 8 1/4%  Junior Subordinated Deferrable Interest Debentures,
Series C (the "Series C  Debentures") to be issued  by PacifiCorp. The Series  C
Debentures  will mature on June 30, 2036 and are redeemable prior to maturity at
the option of PacifiCorp as described  below. The Series A Preferred  Securities
will  have  a  preference  under  certain  circumstances  with  respect  to cash
distributions and amounts payable on  liquidation, redemption or otherwise  over
the  Series A  Common Securities.  See "Description  of Preferred  Securities --
Subordination of Common Securities" in the accompanying Prospectus.
 
    Holders of the  Series A Preferred  Securities will be  entitled to  receive
preferential  cumulative cash distributions  accruing from the  date of original
issuance and  payable quarterly  in arrears  on  the last  day of  March,  June,
September  and December of  each year, commencing  June 30, 1996,  at the annual
rate of 8  1/4% of  the liquidation  preference of  $25 per  Series A  Preferred
Security  ("Distributions"). PacifiCorp  has the right  to defer  the payment of
interest on the Series C Debentures at any time or from time to time for one  or
more periods (each, an "Extension Period"), PROVIDED that such Extension Period,
together  with  all  previous  and  further  extensions  thereof  prior  to  its
termination, does not exceed 20 consecutive quarters and does not extend  beyond
the  maturity  of the  Series C  Debentures.  Upon the  termination of  any such
Extension Period and the payment of all amounts then due on any Interest Payment
Date (as defined herein), PacifiCorp may  elect to begin a new Extension  Period
subject to the requirements set forth herein. If interest payments on the Series
C Debentures are so deferred, Distributions on the Series A Preferred Securities
will  also be deferred and PacifiCorp will  not be permitted, subject to certain
exceptions set  forth herein,  to declare  or pay  any cash  distributions  with
respect  to PacifiCorp's capital  stock or debt securities  that rank PARI PASSU
with or junior to the Series C Debentures. During an Extension Period,  interest
on  the  Series  C  Debentures  will  continue  to  accrue  (and  the  amount of
Distributions to which holders of the Series A Preferred Securities are entitled
will accumulate  at the  rate of  8 1/4%  per annum,  compounded quarterly)  and
holders  of Series  A Preferred Securities  will be required  to accrue interest
income for United States  federal income tax purposes  in advance of receipt  of
cash  related to such interest income. See "Certain Terms of Series C Debentures
- -- Option to  Extend Interest Payment  Period" and "Certain  Federal Income  Tax
Considerations  -- Potential Extension  of Interest Payment  Period and Original
Issue Discount."
 
    PacifiCorp has, through  the Series  A Guarantee, the  Trust Agreement,  the
Series  C Debentures, the  Indenture and the Expense  Agreement (each as defined
herein), taken together, fully,  irrevocably and unconditionally guaranteed  all
of  PacifiCorp Capital I's obligations under  the Series A Preferred Securities.
The Series A Guarantee of PacifiCorp guarantees the payment of Distributions and
payments on liquidation or redemption of the Series A Preferred Securities,  but
only  in each  case to  the extent  of funds  held by  PacifiCorp Capital  I, as
described herein (the "Series A Guarantee"). See "Description of Guarantees"  in
the  accompanying Prospectus. If  PacifiCorp does not  make interest payments on
the Series C Debentures held by PacifiCorp Capital I, PacifiCorp Capital I  will
have  insufficient  funds  to  pay  Distributions  on  the  Series  A  Preferred
Securities. The Series A Guarantee does not cover payment of Distributions  when
PacifiCorp  Capital I does not have  sufficient funds to pay such Distributions.
In such event, a holder of Series  A Preferred Securities may have the right  to
institute  a legal proceeding directly against  PacifiCorp to enforce payment to
such holder  of  the  principal  of or  interest  on  the  Corresponding  Junior
Subordinated  Debentures as described in "Description of Preferred Securities --
Enforcement of  Certain  Rights  by  Holders of  Preferred  Securities"  in  the
accompanying Prospectus. The obligations of
 
                                      S-2
<PAGE>
PacifiCorp  under  the  Series  A  Guarantee and  the  Series  C  Debentures are
subordinate and  junior in  right  of payment  to  all Senior  Indebtedness  (as
defined  in "Description of Junior  Subordinated Debentures -- Subordination" in
the accompanying Prospectus) of PacifiCorp.
 
    The Series A Preferred  Securities are subject  to mandatory redemption,  in
whole or in part, upon repayment of the Series C Debentures at maturity or their
earlier  redemption  in  an amount  equal  to  the amount  of  related  Series C
Debentures maturing  or  being redeemed  at  a  redemption price  equal  to  the
aggregate  liquidation  preference of  such Series  A Preferred  Securities plus
accumulated and  unpaid Distributions  thereon to  the date  of redemption.  The
Series C Debentures are redeemable prior to maturity at the option of PacifiCorp
(i)  on or after  June 11, 2001,  in whole at any  time or in  part from time to
time, at a  redemption price equal  to the  accrued and unpaid  interest on  the
Series  C Debentures so redeemed to the  date fixed for redemption, plus 100% of
the principal amount thereof, or (ii) at  any time, in whole (but not in  part),
upon  the occurrence and continuation of a Special Event (as defined herein), at
a redemption price  equal to the  accrued and  unpaid interest on  the Series  C
Debentures  so  redeemed to  the date  fixed  for redemption,  plus 100%  of the
principal amount  thereof,  in  each  case subject  to  the  further  conditions
described  under "Description  of Junior Subordinated  Debentures -- Redemption"
and "Description  of Corresponding  Junior Subordinated  Debentures --  Optional
Redemption" in the accompanying Prospectus.
 
    At  any time, PacifiCorp will have the right to terminate PacifiCorp Capital
I and cause  the Series C  Debentures to be  distributed to the  holders of  the
Series  A  Preferred  Securities in  liquidation  of PacifiCorp  Capital  I. See
"Certain Terms of  Series A  Preferred Securities  -- Distribution  of Series  C
Debentures."
 
    The  Series C Debentures are  subordinate and junior in  right of payment to
all Senior Indebtedness  of PacifiCorp.  As of  March 31,  1996, PacifiCorp  had
approximately  $3.7 billion  aggregate principal  amount of  Senior Indebtedness
outstanding. The terms  of the Series  C Debentures place  no limitation on  the
amount  of Senior Indebtedness that may  be incurred by PacifiCorp. In addition,
the Series C  Debentures will be  effectively subordinated to  all existing  and
future  liabilities  of  PacifiCorp's  subsidiaries,  and  holders  of  Series C
Debentures should look only to the assets of PacifiCorp for payments on Series C
Debentures. See "Description of Junior Subordinated Debentures -- Subordination"
in the accompanying Prospectus.
 
    In the event of the termination of PacifiCorp Capital I, after  satisfaction
of  creditors of PacifiCorp Capital I as provided by applicable law, the holders
of the Series A Preferred Securities  will be entitled to receive a  liquidation
preference  of $25 per  Series A Preferred Security  plus accumulated and unpaid
Distributions thereon to  the date of  payment, which may  be in the  form of  a
distribution  of  such  amount  in  Series  C  Debentures,  subject  to  certain
exceptions. See "Description of Preferred Securities -- Liquidation Distribution
Upon Termination" in the accompanying Prospectus.
 
    The Series A Preferred Securities have been approved for listing, subject to
notice of issuance, on the New York Stock Exchange (the "NYSE") under the symbol
"PPW PrA". If the Series C Debentures are distributed to the holders of Series A
Preferred Securities upon  the liquidation of  PacifiCorp Capital I,  PacifiCorp
will  use its best efforts to  list the Series C Debentures  on the NYSE or such
other stock exchanges  or other  organizations, if any,  on which  the Series  A
Preferred Securities are then listed.
 
    The Series A Preferred Securities will be represented by global certificates
registered  In the name of The Depository  Trust Company ("DTC") or its nominee.
Beneficial interests in the Series A Preferred Securities will be shown on,  and
transfers   thereof  will  be  effected  only  through,  records  maintained  by
participants in DTC. Except as described in the accompanying Prospectus,  Series
A  Preferred Securities in certificated form will  not be issued in exchange for
the global certificates. See "Description of Preferred Securities --  Book-entry
Issuance" in the accompanying Prospectus.
 
                                      S-3
<PAGE>
    THE FOLLOWING INFORMATION SUPPLEMENTS AND SHOULD BE READ IN CONJUNCTION WITH
THE  INFORMATION CONTAINED IN  THE ACCOMPANYING PROSPECTUS.  AS USED HEREIN, (I)
THE "INDENTURE" MEANS THE  INDENTURE, AS AMENDED AND  SUPPLEMENTED FROM TIME  TO
TIME,  INCLUDING  THE  THIRD SUPPLEMENTAL  INDENTURE  RELATING TO  THE  SERIES C
DEBENTURES, BETWEEN  PACIFICORP  AND THE  BANK  OF  NEW YORK,  AS  TRUSTEE  (THE
"DEBENTURE  TRUSTEE"),  AND (II)  THE "TRUST  AGREEMENT"  MEANS THE  AMENDED AND
RESTATED TRUST AGREEMENT AMONG PACIFICORP, AS  DEPOSITOR, THE BANK OF NEW  YORK,
AS  PROPERTY TRUSTEE (THE "PROPERTY TRUSTEE"),  THE BANK OF NEW YORK (DELAWARE),
AS DELAWARE TRUSTEE  (THE "DELAWARE TRUSTEE"),  AND THE ADMINISTRATIVE  TRUSTEES
NAMED THEREIN (COLLECTIVELY, WITH THE PROPERTY TRUSTEE AND THE DELAWARE TRUSTEE,
THE  "ISSUER  TRUSTEES").  EACH OF  THE  OTHER  CAPITALIZED TERMS  USED  IN THIS
PROSPECTUS SUPPLEMENT AND  NOT OTHERWISE DEFINED  IN THIS PROSPECTUS  SUPPLEMENT
HAS  THE MEANING SET FORTH IN THIS  PROSPECTUS SUPPLEMENT OR IN THE ACCOMPANYING
PROSPECTUS.
 
                                  RISK FACTORS
 
    Prospective purchasers of the Series A Preferred Securities should carefully
review the information contained elsewhere in this Prospectus Supplement and  in
the  accompanying  Prospectus  and should  particularly  consider  the following
matters.
 
RANKING OF SUBORDINATED OBLIGATIONS UNDER THE SERIES A GUARANTEE AND THE SERIES
C DEBENTURES
 
    The obligations  of  PacifiCorp  under  the Series  A  Guarantee  issued  by
PacifiCorp  for the benefit of the holders  of Series A Preferred Securities are
unsecured and rank  subordinate and  junior in right  of payment  to all  Senior
Indebtedness  of PacifiCorp.  The obligations of  PacifiCorp under  the Series C
Debentures are subordinate  and junior in  right of payment  to all such  Senior
Indebtedness.   At  March  31,  1996,  the  Senior  Indebtedness  of  PacifiCorp
aggregated approximately $3.7 billion. In addition, the Series C Debentures will
be  effectively  subordinated  to  all   existing  and  future  liabilities   of
PacifiCorp's  subsidiaries, and holders of Series  C Debentures should look only
to the assets of PacifiCorp for payments on the Series C Debentures. None of the
Indenture, the Series A Guarantee or the Trust Agreement place any limitation on
the amount of secured or unsecured debt, including Senior Indebtedness that  may
be  incurred  by PacifiCorp.  See "Description  of Guarantees  -- Status  of the
Guarantee" and "Description of Junior Subordinated Debentures --  Subordination"
in the accompanying Prospectus.
 
    The  ability of  PacifiCorp Capital  I to  pay amounts  due on  the Series A
Preferred Securities is solely dependent upon PacifiCorp making payments on  the
Series C Debentures as and when required.
 
OPTION TO EXTEND INTEREST PAYMENT PERIOD; TAX CONSEQUENCES; POTENTIAL MARKET
VOLATILITY DURING EXTENSION PERIOD
 
    PacifiCorp  has  the  right under  the  Indenture  to defer  the  payment of
interest on the Series C Debentures at any time or from time to time for one  or
more  Extension Periods, each  of which, together with  all previous and further
extensions of such Extension Period prior to its termination, may not exceed  20
consecutive  quarters and  may not  extend beyond the  maturity of  the Series C
Debentures. As a consequence  of any such  election, quarterly Distributions  on
the  Series A Preferred Securities by PacifiCorp Capital I will be deferred (and
the amount  of  Distributions  to  which  holders  of  the  Series  A  Preferred
Securities  are entitled will continue  to accumulate at the  rate of 8 1/4% per
annum, compounded quarterly) during any  such Extension Period. During any  such
Extension  Period,  PacifiCorp may  not, and  may not  permit any  subsidiary of
PacifiCorp to, (i) declare, set aside or pay any dividend or distribution on, or
repurchase, redeem, or otherwise acquire or  make any sinking fund payment  with
respect to, any shares of PacifiCorp's capital stock or (ii) make any payment of
principal,  interest or premium, if  any, on or repay,  repurchase or redeem any
debt securities (including other Junior Subordinated Debentures) that rank  PARI
PASSU  with  or  junior in  interest  to the  Series  C Debentures  or  make any
guarantee payments with respect  to the foregoing (other  than (a) dividends  or
distributions  in shares of its capital stock  or in rights to acquire shares of
its capital stock, (b) conversions into  or exchanges for shares of its  capital
stock, (c) redemptions, purchases or other acquisitions of shares of its capital
stock made for the
 
                                      S-4
<PAGE>
purpose  of an employee incentive  plan or benefit plan  of PacifiCorp or any of
its subsidiaries and mandatory redemptions or sinking fund payments with respect
to any series  of Preferred Stock  of PacifiCorp that  are subject to  mandatory
redemption  or  sinking fund  requirements, PROVIDED  that the  aggregate stated
value of all such series  outstanding at the time of  any such payment does  not
exceed  five percent of the  aggregate of (1) the  total principal amount of all
bonds or other securities representing secured indebtedness issued or assumed by
PacifiCorp and then outstanding and (2) the capital and surplus of PacifiCorp to
be stated on  the books of  account of  PacifiCorp after giving  effect to  such
payment,  PROVIDED, HOWEVER, that  any moneys deposited in  any sinking fund and
not in violation of this provision may thereafter be applied to the purchase  or
redemption  of such Preferred Stock in accordance with the terms of such sinking
fund without regard  to the restrictions  contained in this  provision, and  (d)
payments  under any guarantee by PacifiCorp with  respect to any securities of a
subsidiary of PacifiCorp, provided that the  proceeds from the issuance of  such
securities  were used to  purchase Junior Subordinated  Debentures of any series
under the  Indenture). Upon  the termination  of any  Extension Period  and  the
payment  of all amounts  then due on  any Interest Payment  Date, PacifiCorp may
elect to  begin  a new  Extension  Period  subject to  the  above  requirements.
Consequently,  there  could be  multiple  Extension Periods  of  varying lengths
throughout the term of the Series C Debentures. See "Certain Terms of the Series
A Preferred Securities  -- Distributions"  and "Certain  Terms of  the Series  C
Debentures -- Option to Extend Interest Payment Period."
 
    Should  an Extension Period occur, a holder of Series A Preferred Securities
will continue to accrue interest income in respect of its PRO RATA share of  the
Series  C  Debentures held  by PacifiCorp  Capital I  for United  States federal
income tax purposes. As a result, a holder of Series A Preferred Securities will
include such interest in  gross income (as original  issue discount) for  United
States  federal income tax purposes in advance  of the receipt of cash, and will
not receive the cash  related to such  income from PacifiCorp  Capital I if  the
holder  disposes of the Series  A Preferred Securities prior  to the record date
for the payment of Distributions. See "Certain Federal Income Tax Considerations
- -- Potential Extension of Interest  Payment Period and Original Issue  Discount"
and " -- Sale or Redemption of Series A Preferred Securities."
 
    PacifiCorp  has  no  current  intention of  exercising  its  right  to defer
payments of interest by  extending the interest payment  period on the Series  C
Debentures.  However,  should PacifiCorp  elect to  exercise  such right  in the
future, the market price of  the Series A Preferred  Securities is likely to  be
affected.  A holder that disposes of its Series A Preferred Securities during an
Extension Period, therefore, might not receive the same return on its investment
as a  holder  that continues  to  hold its  Series  A Preferred  Securities.  In
addition,  as a result of the existence  of PacifiCorp's right to defer interest
payments, the market price of the Series A Preferred Securities (which represent
a preferred undivided  beneficial interest in  the Series C  Debentures) may  be
more volatile than the market prices of other securities on which original issue
discount accrues that are not subject to such deferrals.
 
SPECIAL EVENT REDEMPTION
 
    Upon  the occurrence  and continuation of  a Special Event,  as described in
"Description of Preferred Securities -- Redemption or Exchange -- Special  Event
Redemption  or Distribution of Corresponding  Junior Subordinated Debentures" in
the accompanying Prospectus,  PacifiCorp has the  right to redeem  the Series  C
Debentures in whole (but not in part) within 90 days following the occurrence of
such  Special Event  and thereby  cause a mandatory  redemption of  the Series A
Preferred Securities at  the applicable  redemption price.  See "Description  of
Preferred  Securities -- Redemption  or Exchange --  Special Event Redemption or
Distribution  of   Corresponding   Junior  Subordinated   Debentures"   in   the
accompanying Prospectus.
 
    Under current United States federal income tax law, such a redemption of the
Series  A Preferred Securities  would constitute a taxable  event to the holders
thereof. See "Certain Federal Income Tax  Consequences -- Sale or Redemption  of
Series A Preferred Securities."
 
    There  can be no  assurance as to  the market prices  for Series A Preferred
Securities or Series C Debentures that may be distributed in exchange for Series
A Preferred Securities if a liquidation of
 
                                      S-5
<PAGE>
PacifiCorp Capital I occurs. Accordingly, the Series A Preferred Securities that
an investor may purchase, whether  pursuant to the offer  made hereby or in  the
secondary market, or the Series C Debentures that a holder of Series A Preferred
Securities  may receive on liquidation  of PacifiCorp Capital I,  may trade at a
discount to the price that the investor paid to purchase the Series A  Preferred
Securities  offered hereby. Holders of Series A Preferred Securities may receive
Series C Debentures  upon liquidation  of PacifiCorp Capital  I and  prospective
purchasers  of  Series  A Preferred  Securities  are also  making  an investment
decision with regard to the Series C Debentures and should carefully review  all
the  information  regarding  the  Series  C  Debentures  contained  herein.  See
"Description of the Preferred  Securities -- Redemption  or Exchange --  Special
Event   Redemption   or  Distribution   of  Corresponding   Junior  Subordinated
Debentures" and "Description of the Corresponding Junior Subordinated Debentures
- -- General" in the accompanying Prospectus.
 
POSSIBLE TAX LAW CHANGES
 
    On  March  19,  1996,  President  Clinton  released  the  proposed   Revenue
Reconciliation  Bill of 1996  (the "Bill"). The Bill  would, among other things,
generally deny interest deductions  for interest on an  instrument, issued by  a
corporation, that has a maximum weighted average maturity of more than 40 years.
The  Bill  also would  generally  deny interest  deductions  for interest  on an
instrument, issued by a  corporation, that has  a maximum term  of more than  20
years and that is not shown as indebtedness on the separate balance sheet of the
issuer  or, where  the instrument  is issued  to a  related party  (other than a
corporation), where the  holder or  some other  related party  issues a  related
instrument  that  is  not shown  as  indebtedness on  the  issuer's consolidated
balance sheet. The above-described  provisions of the Bill  were proposed to  be
effective  generally for  instruments issued  on or  after December  7, 1995. If
either provision were to apply to  the Series C Debentures, PacifiCorp would  be
unable to deduct interest on the Series C Debentures.
 
    On March 29, 1996, the Chairmen of the Senate Finance and the House Ways and
Means  Committees  issued a  joint statement  to  the effect  that it  was their
intention that the effective date  of the President's legislative proposals,  if
adopted,  would  be  no  earlier than  the  date  of  "appropriate Congressional
action." As discussed below under "Certain Federal Income Tax Considerations  --
Classification  of the Series C Debentures",  PacifiCorp believes and intends to
take the position  that interest on  the Series C  Debentures is deductible  for
United  States federal income tax purposes.  There can be no assurance, however,
that current  or future  legislative  proposals or  final legislation  will  not
affect  the ability of PacifiCorp to deduct interest on the Series C Debentures.
If legislation were  enacted limiting,  in whole  or in  part, deductibility  by
PacifiCorp  of interest  on the  Series C  Debentures for  United States federal
income tax purposes, such enactment would give rise to a Tax Event, which  would
permit  PacifiCorp to cause a redemption of the Series A Preferred Securities or
a distribution  of the  Series C  Debentures,  as described  more fully  in  the
accompanying Prospectus under "Description of Preferred Securities -- Redemption
or  Exchange -- Special Event Redemption or Distribution of Corresponding Junior
Subordinated Debentures."
 
RIGHTS UNDER THE SERIES A GUARANTEE
 
    The Series A  Guarantee will be  qualified as an  indenture under the  Trust
Indenture  Act of 1939, as amended (the  "Trust Indenture Act"). The Bank of New
York will  act  as the  indenture  trustee under  the  Series A  Guarantee  (the
"Guarantee Trustee") for the purposes of compliance with the Trust Indenture Act
and  will hold  the Series  A Guarantee for  the benefit  of the  holders of the
Series A Preferred Securities. The Bank of  New York also will act as  Debenture
Trustee  for the  Series C  Debentures and as  Property Trustee  under the Trust
Agreement. The Series  A Guarantee  guarantees to the  holders of  the Series  A
Preferred  Securities  the  following  payments,  to  the  extent  not  paid  by
PacifiCorp Capital I: (i) any  accumulated and unpaid Distributions required  to
be  paid on  the Series  A Preferred Securities,  to the  extent that PacifiCorp
Capital I has funds on hand  available therefor, (ii) the redemption price  with
respect to any Series A Preferred Securities called for redemption to the extent
that PacifiCorp Capital I has funds on hand available therefor, and (iii) upon a
voluntary  or involuntary dissolution,  winding up or  liquidation of PacifiCorp
Capital I (unless  the Series  C Debentures are  distributed to  holders of  the
Series  A  Preferred  Securities),  the  lesser  of  (a)  the  aggregate  of the
liquidation preference and all
 
                                      S-6
<PAGE>
accumulated and  unpaid Distributions  to  the date  of  payment to  the  extent
PacifiCorp  Capital I has funds on hand available therefor and (b) the amount of
assets of PacifiCorp Capital I  remaining available for distribution to  holders
of  the Series  A Preferred  Securities. If  PacifiCorp were  to default  on its
obligation to  pay amounts  payable under  the Series  C Debentures,  PacifiCorp
Capital  I would lack funds for the  payment of Distributions or amounts payable
on redemption of the  Series A Preferred Securities  or otherwise, and, in  such
event,  holders of the Series  A Preferred Securities would  not be able to rely
upon the Series A Guarantee for payment of such amounts. Instead, holders of the
Series  A  Preferred  Securities  would  have  the  limited  enforcement  rights
described  under  "Description of  Preferred  Securities --  Events  of Default;
Notice" in  the accompanying  Prospectus. See  "Description of  Guarantees"  and
"Description   of   Corresponding   Junior  Subordinated   Debentures"   in  the
accompanying Prospectus. The Trust Agreement provides that each holder of Series
A Preferred Securities  by acceptance thereof  agrees to the  provisions of  the
Series A Guarantee and the Indenture.
 
LIMITED VOTING RIGHTS
 
    Holders  of Series A Preferred Securities will generally have limited voting
rights relating only to  the modification of the  Series A Preferred  Securities
and  the dissolution, winding-up or liquidation of PacifiCorp Capital I. Holders
of Series A Preferred Securities will not be entitled to vote to appoint, remove
or replace the Property Trustee or the Delaware Trustee, which voting rights are
vested exclusively in the holder of  the Series A Common Securities except  upon
the  occurrence of certain events. The  Issuer Trustees and PacifiCorp may amend
the Trust  Agreement  without the  consent  of  holders of  Series  A  Preferred
Securities  to ensure  that PacifiCorp Capital  I will be  classified for United
States federal  income tax  purposes as  a grantor  trust, even  if such  action
adversely  affects  the interests  of such  holders in  a material  respect. See
"Description of  Preferred  Securities  -- Voting  Rights;  Amendment  of  Trust
Agreement" and " -- Removal of Issuer Trustees" in the accompanying Prospectus.
 
TRADING CHARACTERISTICS OF SERIES A PREFERRED SECURITIES
 
    PacifiCorp  Capital I intends  to list the Series  A Preferred Securities on
the NYSE. The  Series A Preferred  Securities may  trade at prices  that do  not
fully  reflect the  value of  accrued but  unpaid interest  with respect  to the
underlying Series C Debentures. A holder  of Series A Preferred Securities  that
disposes  of its Series A Preferred Securities between record dates for payments
of  Distributions  (and  consequently  does  not  receive  a  Distribution  from
PacifiCorp Capital I for the period prior to such disposition) will nevertheless
be  required to include as  ordinary income, accrued but  unpaid interest on the
Series C Debentures through the  date of disposition and  to add such amount  to
its  adjusted tax basis in  the Series A Preferred  Securities disposed of. Such
holder will recognize a capital loss to the extent the selling price (which  may
not  fully reflect the amount  of accrued but unpaid  interest) is less than its
adjusted tax basis (which will reflect accrued but unpaid interest). Subject  to
certain  limited exceptions, capital losses cannot be applied to offset ordinary
income for  United States  federal  income tax  purposes. See  "Certain  Federal
Income   Tax  Considerations  --  Sale  or  Redemption  of  Series  A  Preferred
Securities."
 
                              PACIFICORP CAPITAL I
 
    PacifiCorp Capital I is  a statutory business  trust created under  Delaware
law  pursuant to (i) a trust agreement executed by PacifiCorp, as Depositor, The
Bank of New  York, as  Property Trustee,  The Bank  of New  York (Delaware),  as
Delaware  Trustee,  and the  Administrative Trustee  named therein  (which trust
agreement was later amended and restated in the form of the Trust Agreement) and
(ii) the filing of a certificate of  trust with the Delaware Secretary of  State
on May 7, 1996. PacifiCorp Capital I's business and affairs are conducted by the
Issuer Trustees: The Bank of New York, as Property Trustee, The Bank of New York
(Delaware),  as Delaware Trustee, and two individual Administrative Trustees who
are employees or officers of or affiliated with PacifiCorp. PacifiCorp Capital I
exists for  the exclusive  purposes of  (i)  issuing and  selling the  Series  A
Preferred  Securities and  Series A Common  Securities, (ii)  using the proceeds
from the  sale  of  Series  A  Preferred Securities  and  the  Series  A  Common
Securities  to  acquire  Series  C Debentures  issued  by  PacifiCorp  and (iii)
engaging in  only those  other activities  necessary, convenient  or  incidental
thereto.  Accordingly,  the  Series C  Debentures  will  be the  sole  assets of
 
                                      S-7
<PAGE>
PacifiCorp Capital I,  and payments under  the Series C  Debentures will be  the
sole revenue of PacifiCorp Capital I. All of the Series A Common Securities will
be owned by PacifiCorp. The Series A Common Securities will rank PARI PASSU, and
payments  will be made thereon PRO RATA, with the Series A Preferred Securities,
except that upon the occurrence and continuance of an event of default under the
Trust Agreement resulting  from an  Event of  Default under  the Indenture,  the
rights  of PacifiCorp as holder of the  Series A Common Securities to payment in
respect of Distributions and payments upon liquidation, redemption or  otherwise
will  be subordinated  to the rights  of the  holders of the  Series A Preferred
Securities. See "Description of Preferred Securities -- Subordination of  Common
Securities"  in the  accompanying Prospectus.  PacifiCorp will  acquire Series A
Common Securities having  an aggregate  liquidation amount  equal to  3% of  the
total  capital of PacifiCorp  Capital I. PacifiCorp  Capital I has  a term of 45
years, but  may  terminate earlier  as  provided  in the  Trust  Agreement.  The
principal  executive office of  PacifiCorp Capital I is  700 NE Multnomah, Suite
1600, Portland,  OR 97232,  Attention: Secretary,  and its  telephone number  is
(503) 731-2000. See "The Issuer Trusts" in the accompanying Prospectus.
 
                                   PACIFICORP
 
    PacifiCorp  is an  electric utility  headquartered in  Portland, Oregon that
conducts a  retail  electric utility  business  through Pacific  Power  &  Light
Company  and Utah  Power &  Light Company, and  engages in  power production and
sales on a wholesale basis under the name PacifiCorp. PacifiCorp is the indirect
owner,  through   PacifiCorp   Holdings,  Inc.   (a   wholly-owned   subsidiary)
("Holdings"),  of 100%  of each of  Powercor Australia  Limited ("Powercor"), an
Australian electric distribution  company, and Pacific  Telecom, Inc.  ("Pacific
Telecom"),  a leading provider of local  telephone exchange service to rural and
suburban markets.
 
    PacifiCorp furnishes electric service  to approximately 1,300,000  customers
in  portions of seven western states:  California, Idaho, Montana, Oregon, Utah,
Washington and  Wyoming.  Powercor  serves approximately  570,000  customers  in
suburban  Melbourne and the western and central regions of the State of Victoria
in southeast  Australia. Pacific  Telecom,  through its  subsidiaries,  provides
local telephone service and access to the long-distance network in Alaska, seven
other  western  states and  three  midwestern states,  provides  cellular mobile
telephone services in  six states and  is engaged  in sales of  capacity in  and
operation  of a submarine fiber optic cable between the United States and Japan.
Holdings also has interests in  the independent power and cogeneration  business
through  its wholly-owned subsidiary, Pacific  Generation Company, and continues
to liquidate portions of the loan, leasing and real estate investment  portfolio
of its wholly-owned subsidiary, PacifiCorp Financial Services, Inc. ("PFS"). PFS
expects  to retain only its tax advantaged investments in leveraged lease assets
(primarily aircraft)  and affordable  housing, and  is limiting  its pursuit  of
tax-advantaged investment opportunities to affordable housing.
 
    The  principal  executive  offices  of  PacifiCorp  are  located  at  700 NE
Multnomah, Suite 1600,  Portland, Oregon  97232; the telephone  number is  (503)
731-2000.
 
                                USE OF PROCEEDS
 
    All  of the proceeds from the sale  of Series A Preferred Securities will be
invested by PacifiCorp Capital I in  Series C Debentures. The proceeds from  the
sale of such Series C Debentures will initially become part of the general funds
of  PacifiCorp  and will  be  used to  repay all  or  a portion  of PacifiCorp's
short-term borrowings  outstanding  at  the  time  of  issuance.  PacifiCorp  is
considering  the retirement  of long-term  debt and  other senior  securities in
connection with which it may incur additional short-term indebtedness.
 
                                      S-8
<PAGE>
                         SELECTED FINANCIAL INFORMATION
             (DOLLAR AMOUNTS IN MILLIONS, EXCEPT PER SHARE AMOUNTS)
 
    The selected financial data of PacifiCorp  for the years ended December  31,
1993, 1994 and 1995 and the three-months ended March 31, 1995 and 1996 set forth
below  were derived from and should be read in conjunction with the consolidated
financial  statements  and   related  notes  of   PacifiCorp  and   subsidiaries
incorporated  by  reference  in the  accompanying  Prospectus.  The consolidated
financial statements for the three-year period ended December 31, 1995 have been
audited by  Deloitte &  Touche LLP,  independent auditors,  and the  reports  of
Deloitte  & Touche LLP thereon are incorporated by reference in the accompanying
Prospectus.
 
<TABLE>
<CAPTION>
                                 TWELVE MONTHS ENDED DECEMBER       THREE MONTHS ENDED
                                              31,                        MARCH 31,
                                -------------------------------     -------------------
                                  1993       1994       1995          1995       1996
                                --------   --------   ---------     --------   --------
<S>                             <C>        <C>        <C>           <C>        <C>
Income Statement Data:
  Revenues
    Electric..................  $  2,507   $  2,648   $   2,616     $    649   $    705
    Pacific Telecom...........       702        705         649          182        125
    Powercor..................        --         --          26           --        140
    Other(1)(2)...............       196        154         134           28         35
                                --------   --------   ---------     --------   --------
      Total...................     3,405      3,507       3,425          859      1,005
  Income from Operations(3)
    Electric..................       784        819         801          209        220
    Pacific Telecom...........       141        165         165           40         35
    Powercor..................        --         --           6           --         36
    Other(1)(2)...............        44         38          84           17         21
                                --------   --------   ---------     --------   --------
      Total...................       969      1,022       1,056          266        312
  Income from Continuing
   Operations.................       423        468         505          115        130
  Discontinued Operations
   (4)........................        52         --          --           --         --
  Cumulative Effect on Prior
   Years of a Change in
   Accounting for Income
   Taxes......................         4         --          --           --         --
  Net Income..................       479        468         505          115        130
  Preferred Stock Dividend
   Requirements...............        39         40          39           10          9
  Earnings Contribution on
   Common Stock
    Electric..................       323        340         276(5)        81         86
    Pacific Telecom...........        51         70         103           14         16
    Powercor..................        --         --           1           --         11
    Other (1).................        10         18          86(5)        10          8
  Discontinued Operations
   (4)........................        52         --          --           --         --
  Cumulative Effect on Prior
   Years of a Change in
   Accounting for Income
   Taxes......................         4         --          --           --         --
                                --------   --------   ---------     --------   --------
      Total...................  $    440   $    428   $     466     $    105   $    121
                                --------   --------   ---------     --------   --------
                                --------   --------   ---------     --------   --------
  Average Common Shares
   Outstanding (Thousands)....   274,551    282,912     284,272      284,260    286,490
  Earnings per Common Share:
    Continuing Operations.....  $   1.40   $   1.51   $    1.64          .37        .42
    Discontinued Operations
     (4)......................       .19         --          --           --         --
    Cumulative Effect on Prior
     Years of a Change in
     Accounting for Income
     Taxes....................       .01         --          --           --         --
                                --------   --------   ---------     --------   --------
      Total...................  $   1.60   $   1.51   $    1.64          .37        .42
                                --------   --------   ---------     --------   --------
                                --------   --------   ---------     --------   --------
  Dividends Declared per
   Common Share...............  $   1.08   $   1.08   $    1.08          .27        .27
                                --------   --------   ---------     --------   --------
                                --------   --------   ---------     --------   --------
</TABLE>
 
<TABLE>
<CAPTION>
                                                       MARCH 31, 1996
                                          ----------------------------------------
                                                ACTUAL           AS ADJUSTED (6)
                                          -------------------   ------------------
                                           AMOUNT        %       AMOUNT       %
                                          ---------   -------   --------   -------
<S>                                       <C>         <C>       <C>        <C>
                                              (UNAUDITED)          (UNAUDITED)
Capital Structure:
  Long-Term Debt and Capital Lease
   Obligations..........................    $5,170         54%    $5,170        53%
  Company Obligated Mandatorily
   Redeemable Preferred Securities of
   Subsidiary Trust Holding Solely
   Parent Junior Subordinated Debentures
   (7)..................................        --         --       217          2
  Preferred Stock.......................       312          4       312          3
  Preferred Stock Subject to Mandatory
   Redemption...........................       219          2       219          2
  Common Equity.........................     3,861         40     3,861         40
                                          ---------   -------   --------   -------
    Total...............................    $9,562        100%    $9,779       100%
Short-Term Debt.........................    $  515                $ 305
Long-term Debt and Capital Lease
 Obligations Currently Maturing.........    $  236                $ 236
</TABLE>
 
- ------------------------------
(1) Other includes the operations of Pacific Generation Company and PFS, as well
    as the activities of Holdings.
 
                                      S-9
<PAGE>
(2) Certain amounts from prior years have been reclassified to conform with  the
    1996  method  of  presentation.  These reclassifications  had  no  effect on
    previously reported consolidated net income.
 
(3) Income before income taxes, interest, other nonoperating items, discontinued
    operations and cumulative effect of a change in an accounting principle.
 
(4)  Discontinued   operations   represents   PacifiCorp's   interests   in   an
    international  communications subsidiary of Pacific Telecom, the disposition
    of which was completed in September 1993.
 
(5) PacifiCorp reached a tax settlement  with the U.S. Internal Revenue  Service
    for  the  tax years  1983-1988, including  the issues  relating to  the 1983
    abandonment of  PacifiCorp's  interest  in Washington  Public  Power  Supply
    System  Unit 3.  The settlement  had no  effect on  consolidated net income,
    although it had the effect of reducing Electric earnings contribution by $32
    million and increasing Other earnings contribution by $32 million.
 
(6) Adjusted to  give effect to  the consummation of  the offering of  8,680,000
    Preferred  Securities  and the  application  of the  estimated  net proceeds
    therefrom to repay short-term debt.
 
(7) As described herein, the assets of PacifiCorp Capital I will consist  solely
    of  approximately $224 million of Series  C Debentures, issued by PacifiCorp
    to PacifiCorp Capital I,  and certain rights under  the Series A  Guarantee.
    The  Series C Debentures will bear interest at  the annual rate of 8 1/4% of
    the principal amount thereof  and will mature on  June 30, 2036.  PacifiCorp
    owns all of the Series A Common Securities of PacifiCorp Capital I.
 
                              ACCOUNTING TREATMENT
 
    For  financial reporting purposes, PacifiCorp Capital I will be treated as a
subsidiary of PacifiCorp and, accordingly, the accounts of PacifiCorp Capital  I
will  be included  in the consolidated  financial statements  of PacifiCorp. The
Series A Preferred Securities will be presented  as a separate line item in  the
consolidated  balance sheet of PacifiCorp  and appropriate disclosures about the
Series A  Preferred  Securities,  the  Series  A  Guarantee  and  the  Series  C
Debentures  will  be  included  in  the  notes  to  the  consolidated  financial
statements.  For   financial   reporting  purposes,   PacifiCorp   will   record
Distributions payable on the Series A Preferred Securities as an expense.
 
                                      S-10
<PAGE>
                 CERTAIN TERMS OF SERIES A PREFERRED SECURITIES
 
GENERAL
 
    The  following  summary of  certain  terms and  provisions  of the  Series A
Preferred Securities supplements the description of the terms and provisions  of
the  Preferred Securities  set forth  in the  accompanying Prospectus  under the
heading "Description of Preferred Securities," to which description reference is
hereby made.  This summary  of certain  terms  and provisions  of the  Series  A
Preferred  Securities does  not purport  to be complete  and is  subject to, and
qualified in its entirety by reference to, the Trust Agreement. The form of  the
Trust  Agreement has been filed  as an exhibit to  the Registration Statement of
which this Prospectus Supplement and accompanying Prospectus is a part.
 
DISTRIBUTIONS
 
    The Series A Preferred  Securities represent undivided beneficial  interests
in  the  assets of  PacifiCorp Capital  I,  and Distributions  on each  Series A
Preferred Security will be payable  at the annual rate of  8 1/4% of the  stated
liquidation  preference of $25,  payable quarterly in arrears  on March 31, June
30, September 30  and December 31  of each year.  Distributions will  accumulate
from  June  11, 1996,  the  date of  original  issuance. The  first Distribution
payment date for the Series  A Preferred Securities will  be June 30, 1996.  The
amount  of Distributions payable for any period will be computed on the basis of
a 360-day year of twelve 30-day months  and, for any period shorter than a  full
calendar  month,  on the  basis of  the actual  number of  days elapsed  in such
period. In the event  that any date  on which Distributions  are payable on  the
Series  A  Preferred Securities  is  not a  Business  Day, then  payment  of the
Distributions payable on such date will be made on the next succeeding day  that
is  a Business Day (and without any additional Distributions 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   the  date  such   payment  was  originally   payable.  Accrued  and  unpaid
distributions will  accumulate  additional  Distributions  thereon  ("Additional
Amounts")  after the payment date therefor in  an amount equal to the additional
interest accrued on interest in arrears on the Series C Debentures. See "Certain
Terms of  Series C  Debentures --  General." The  term "Distributions"  as  used
herein  shall include any such Additional Amounts. See "Description of Preferred
Securities -- Distributions" in the accompanying Prospectus.
 
    So long as  no Event  of Default  under the  Indenture has  occurred and  is
continuing, PacifiCorp has the right under the Indenture to defer the payment of
interest  on the Series C Debentures at any time or from time to time for one or
more Extension Periods, each  of which, together with  all previous and  further
extensions  of such Extension Period prior to its termination, may not exceed 20
consecutive quarters and  may not  extend beyond the  maturity of  the Series  C
Debentures.  As a consequence  of any such  election, quarterly Distributions on
the Series  A Preferred  Securities will  be deferred  by PacifiCorp  Capital  I
during any such Extension Period. Distributions to which holders of the Series A
Preferred  Securities  are  entitled  will  accumulate  additional Distributions
thereon at the rate of 8 1/4%  per annum thereof, compounded quarterly from  the
relevant  payment date for such Distributions. During any such Extension Period,
PacifiCorp may not,  and may  not permit any  subsidiary of  PacifiCorp to,  (i)
declare,  set  aside or  pay  any dividend  or  distribution on,  or repurchase,
redeem, or otherwise acquire or make  any sinking fund payment with respect  to,
any  shares of PacifiCorp's capital stock or (ii) make any payment of principal,
interest or  premium,  if  any, on  or  repay,  repurchase or  redeem  any  debt
securities  that rank PARI PASSU with or junior in interest to the Corresponding
Junior Subordinated Debentures or  make any guarantee  payments with respect  to
the  foregoing  (other than  (a)  dividends or  distributions  in shares  of its
capital stock  or  in  rights  to  acquire shares  of  its  capital  stock,  (b)
conversions  into or exchanges for shares of its capital stock, (c) redemptions,
purchases or other  acquisitions of  shares of its  capital stock  made for  the
purpose  of an employee incentive  plan or benefit plan  of PacifiCorp or any of
its subsidiaries and mandatory redemptions or sinking fund payments with respect
to any series  of Preferred Stock  of PacifiCorp that  are subject to  mandatory
redemption  or  sinking fund  requirements, PROVIDED  that the  aggregate stated
value of all such series  outstanding at the time of  any such payment does  not
exceed  five percent of the  aggregate of (1) the  total principal amount of all
bonds or other securities representing secured indebtedness issued or assumed by
PacifiCorp and then outstanding and (2) the capital and
 
                                      S-11
<PAGE>
surplus of PacifiCorp to be stated on  the books of account of PacifiCorp  after
giving  effect to such payment, PROVIDED,  HOWEVER, that any moneys deposited in
any sinking  fund and  not in  violation  of this  provision may  thereafter  be
applied to the purchase or redemption of such Preferred Stock in accordance with
the  terms of such sinking fund without  regard to the restrictions contained in
this provision, and (d) payments under any guarantee by PacifiCorp with  respect
to any securities of a subsidiary of PacifiCorp, provided that the proceeds from
the  issuance  of  such securities  were  used to  purchase  Junior Subordinated
Debentures of any series under the Indenture). Upon the termination of any  such
Extension Period and the payment of all amounts then due on any Interest Payment
Date, PacifiCorp may elect to begin a new Extension Period, subject to the above
requirements.  See "Certain Terms of the Series C Debentures -- Option to Extend
Interest Payment  Period"  and  "Certain  Federal  Income  Tax  Consequences  --
Potential Extension of Interest Payment Period and Original Issue Discount."
 
    PacifiCorp  has  no  current  intention of  exercising  its  right  to defer
payments of interest by  extending the interest payment  period on the Series  C
Debentures.
 
REDEMPTION
 
    Upon  the repayment  or redemption,  in whole  or in  part, of  the Series C
Debentures, whether at maturity  or upon earlier redemption  as provided in  the
Indenture,  the proceeds from  such repayment or redemption  shall be applied by
the Property  Trustee  to  redeem  a  Like Amount  of  the  Series  A  Preferred
Securities, upon not less than 30 nor more than 60 days notice prior to the date
fixed for repayment or redemption (the "Redemption Date"), at a redemption price
equal  to  the  aggregate  liquidation preference  of  such  Series  A Preferred
Securities plus accumulated and unpaid  Distributions thereon to the  Redemption
Date  (the  "Redemption Price").  See  "Description of  Preferred  Securities --
Redemption or Exchange"  in the  accompanying Prospectus and  "Certain Terms  of
Series C Debentures -- Redemption".
 
    PacifiCorp  will have the right to redeem  the Series C Debentures (i) on or
after June 11, 2001, in  whole at any time  or in part from  time to time, at  a
redemption  price  equal to  the accrued  and  unpaid interest  on the  Series C
Debentures so  redeemed to  the date  fixed  for redemption,  plus 100%  of  the
principal  amount thereof or (ii) at any time,  in whole (but not in part), upon
the occurrence of and continuation of a Tax Event or an Investment Company Event
(each as defined in the accompanying Prospectus, and as so collectively defined,
a "Special  Event"), at  a redemption  price  equal to  the accrued  and  unpaid
interest  on  the  Series  C  Debentures  so  redeemed  to  the  date  fixed for
redemption, plus 100% of the principal  amount thereof, in each case subject  to
conditions  described under  "Description of  Junior Subordinated  Debentures --
Redemption or Exchange"  and "Description of  Corresponding Junior  Subordinated
Debentures -- Optional Redemption" in the accompanying Prospectus.
 
DISTRIBUTION OF SERIES C DEBENTURES
 
    At  any time, PacifiCorp will have the right to terminate PacifiCorp Capital
I and, after satisfaction of the liabilities of creditors of PacifiCorp  Capital
I as provided by applicable law, cause the Series C Debentures to be distributed
to the holders of the Series A Preferred Securities in liquidation of PacifiCorp
Capital I. See "Certain Terms of Series C Debentures -- Distribution of Series C
Debentures."  Under  current  United  States federal  income  tax  law, provided
PacifiCorp Capital  I  is  treated as  a  grantor  trust at  the  time  of  such
distribution,  such distribution would not be a  taxable event to holders of the
Series A  Preferred Securities.  Following  the occurrence  of a  Special  Event
pursuant  to  which PacifiCorp  Capital I  was determined  to be  an association
taxable as a corporation, however, such a distribution would be a taxable  event
to such holders. See "Certain Federal Income Tax Consequences -- Distribution of
Series  C Debentures to Holders of Series A Preferred Securities." If PacifiCorp
does not elect  to redeem  or distribute the  Series C  Debentures as  described
above,  the  Series A  Preferred Securities  will  remain outstanding  until the
repayment of the Series C Debentures.
 
LIQUIDATION VALUE
 
    The amount payable on the Series A Preferred Securities in the event of  any
liquidation  of PacifiCorp Capital I is $25 per Series A Preferred Security plus
accumulated and unpaid Distributions, which may be
 
                                      S-12
<PAGE>
in the form of a distribution of such amount in Series C Debentures, subject  to
certain  exceptions.  See "Description  of  Preferred Securities  -- Liquidation
Distribution Upon Termination" in the accompanying Prospectus.
 
                      CERTAIN TERMS OF SERIES C DEBENTURES
 
GENERAL
 
    The following  summary of  certain  terms and  provisions  of the  Series  C
Debentures  supplements  the  description of  the  terms and  provisions  of the
Corresponding Junior  Subordinated  Debentures  set forth  in  the  accompanying
Prospectus  under the  headings "Description of  Junior Subordinated Debentures"
and "Description  of Corresponding  Junior  Subordinated Debentures,"  to  which
description  reference  is  hereby  made.  The  summary  of  certain  terms  and
provisions of the Series  C Debentures set  forth below does  not purport to  be
complete  and is subject to, and qualified  in its entirety by reference to, the
Indenture. The  Indenture has  been  filed as  an  exhibit to  the  Registration
Statement  of which this Prospectus Supplement  and accompanying Prospectus is a
part.
 
    Concurrently with  the  issuance  of  the  Series  A  Preferred  Securities,
PacifiCorp Capital I will invest the proceeds thereof and the consideration paid
by  PacifiCorp for  the Series  A Common Securities  in the  Series C Debentures
issued by PacifiCorp. The Series C  Debentures will bear interest at the  annual
rate  of 8 1/4% of the principal amount thereof, payable quarterly in arrears on
March 31, June 30, September 30 and December 31 of each year (each, an "Interest
Payment Date"),  commencing June  30, 1996,  to the  person in  whose name  each
Series C Debenture is registered, subject to certain exceptions, at the close of
business on the fifteenth day of the last month of each calendar quarter.
 
    It is anticipated that, until the liquidation, if any, of PacifiCorp Capital
I,  each Series C Debenture will be held  in the name of the Property Trustee in
trust for the benefit of the holders  of the Series A Preferred Securities.  The
amount  of interest payable  for any period will  be computed on  the basis of a
360-day year of twelve  30-day months and,  for any period  shorter than a  full
calendar  month,  on the  basis of  the actual  number of  days elapsed  in such
period. In the event that any date on which interest is payable on the Series  C
Debentures  is not a Business Day, then  payment of the interest payable on such
date will be made on the next succeeding day that 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 the  date such payment was originally payable. Accrued
interest that is  not paid  on the applicable  Interest Payment  Date will  bear
additional  interest on the amount  thereof (to the extent  permitted by law) at
the rate per annum of 8 1/4% thereof, compounded quarterly. The term  "interest"
as  used herein shall include quarterly interest payments, interest on quarterly
interest  payments  not  paid  on  the  applicable  Interest  Payment  Date  and
Additional Sums (as defined below), as applicable.
 
    The  Series C Debentures will  be issued as a  series of Junior Subordinated
Debentures under the Indenture. The Series C Debentures will mature on June  30,
2036.  The Series  C Debentures will  be unsecured  and will rank  junior and be
subordinate in right  of payment to  all Senior Indebtedness  of PacifiCorp.  In
addition,  the  Series  C Debentures  will  be effectively  subordinated  to all
existing and future  liabilities of  PacifiCorp's subsidiaries,  and holders  of
Series C Debentures should look only to the assets of PacifiCorp for payments on
the Series C Debentures. The Indenture does not limit the incurrence or issuance
of  other secured or unsecured debt  of PacifiCorp, whether under the Indenture,
any other existing  or other  indenture that PacifiCorp  may enter  into in  the
future  or  otherwise. See  "Description  of Junior  Subordinated  Debentures --
Subordination" in the accompanying Prospectus.
 
OPTION TO EXTEND INTEREST PAYMENT PERIOD
 
    So long as  no Event  of Default  under the  Indenture has  occurred and  is
continuing,  PacifiCorp has the right under the Indenture at any time during the
term of the Series C Debentures to defer the payment of interest at any time  or
from  time to time  for one or  more Extension Periods,  each of which, together
with all previous and further extensions  of such Extension Period prior to  its
termination, may not exceed
 
                                      S-13
<PAGE>
20  consecutive quarters and may not extend  beyond the maturity of the Series C
Debentures. At  the  end of  such  Extension  Period, PacifiCorp  must  pay  all
interest  then accrued and unpaid (together  with interest thereon at the annual
rate of 8  1/4%, compounded  quarterly, to  the extent  permitted by  applicable
law).  During an Extension Period, interest  will continue to accrue and holders
of Series C Debentures (or holders  of Series A Preferred Securities while  such
series  is outstanding)  will be required  to accrue interest  income for United
States  federal  income   tax  purposes.   See  "Certain   Federal  Income   Tax
Considerations  -- Potential Extension  of Interest Payment  Period and Original
Issue Discount."
 
    During any such Extension Period, PacifiCorp may not, and may not permit any
subsidiary of  PacifiCorp to,  (i) declare,  set aside  or pay  any dividend  or
distribution on, or repurchase, redeem, or otherwise acquire or make any sinking
fund  payment with respect to, any shares  of PacifiCorp's capital stock or (ii)
make any  payment  of principal,  interest  or premium,  if  any, on  or  repay,
repurchase  or redeem any  debt securities (including  other Junior Subordinated
Debentures) that rank  PARI PASSU with  or junior  in interest to  the Series  C
Debentures  or make any guarantee payments  with respect to the foregoing (other
than (a) dividends or distributions in shares of its capital stock or in  rights
to  acquire shares of its  capital stock, (b) conversions  into or exchanges for
shares of its capital stock, (c) redemptions, purchases or other acquisitions of
shares of its capital stock made for  the purpose of an employee incentive  plan
or  benefit  plan  of  PacifiCorp  or  any  of  its  subsidiaries  and mandatory
redemptions or sinking  fund payments with  respect to any  series of  Preferred
Stock  of PacifiCorp  that are subject  to mandatory redemption  or sinking fund
requirements, PROVIDED  that  the aggregate  stated  value of  all  such  series
outstanding  at the time of any such payment does not exceed five percent of the
aggregate of (1)  the total principal  amount of all  bonds or other  securities
representing  secured  indebtedness issued  or  assumed by  PacifiCorp  and then
outstanding and (2) the capital  and surplus of PacifiCorp  to be stated on  the
books  of account of  PacifiCorp after giving effect  to such payment, PROVIDED,
HOWEVER, that any moneys deposited in any  sinking fund and not in violation  of
this  provision may thereafter be applied to  the purchase or redemption of such
Preferred Stock in accordance with the terms of such sinking fund without regard
to the restrictions  contained in  this provision,  and (d)  payments under  any
guarantee  by  PacifiCorp with  respect  to any  securities  of a  subsidiary of
PacifiCorp, provided that the proceeds from the issuance of such securities were
used to  purchase  Junior  Subordinated  Debentures  of  any  series  under  the
Indenture). Upon the termination of any such Extension Period and the payment of
all amounts then due on any Interest Payment Date, PacifiCorp may elect to begin
a  new Extension Period, subject to the above requirements. No interest shall be
due and  payable  during  an  Extension  Period,  except  at  the  end  thereof.
PacifiCorp  must give the Property Trustee,  the Administrative Trustees and the
Debenture Trustee notice of  its election of such  Extension Period at least  15
Business  Days prior  to the earlier  of (i)  the date the  Distributions on the
Series A Preferred Securities would have been payable except for the election to
begin such Extension Period  and (ii) the date  the Administrative Trustees  are
required  to  give  notice  to  the  NYSE  or  other  applicable self-regulatory
organization or to holders of such  Series A Preferred Securities of the  record
date  or the date such Distributions are payable, but in any event not less than
one Business Day prior  to such record date.  The Administrative Trustees  shall
give  notice of  PacifiCorp's election  to begin a  new Extension  Period to the
holders of the Series A Preferred Securities at least 10 Business Days prior  to
the  date the Distributions on the Series A Preferred Securities would have been
payable except for the election to begin such Extension Period. See "Description
of Junior Subordinated Debentures -- Option to Extend Interest Payment Date"  in
the accompanying Prospectus.
 
ADDITIONAL SUMS
 
    If  PacifiCorp Capital I is required to  pay any additional taxes, duties or
other governmental charges as a  result of a Tax  Event, PacifiCorp will pay  as
additional  amounts on the Series C  Debentures such amounts ("Additional Sums")
as shall be required so that  the Distributions payable by PacifiCorp Capital  I
shall  not be reduced as a result of  any such additional taxes, duties or other
governmental charges, subject to the conditions described under "Description  of
Preferred  Securities -- Redemption  or Exchange --  Special Event Redemption or
Distribution  of   Corresponding   Junior  Subordinated   Debentures"   in   the
accompanying Prospectus.
 
                                      S-14
<PAGE>
REDEMPTION
 
    The  Series C Debentures are  redeemable prior to maturity  at the option of
PacifiCorp (i) on or after June 11, 2001,  in whole at any time or in part  from
time  to time, at a redemption price equal to the accrued and unpaid interest on
the Series C Debentures so redeemed to  the date fixed for redemption plus  100%
of the principal amount thereof or (ii) at any time, in whole (but not in part),
upon  the occurrence and continuation of a  Special Event, at a redemption price
equal to the accrued and unpaid interest on the Series C Debentures so  redeemed
to  the date fixed for redemption, plus 100% of the principal amount thereof, in
each case  subject to  the further  conditions described  under "Description  of
Junior  Subordinated Debentures -- Redemption" and "Description of Corresponding
Junior Subordinated  Debentures  --  Optional Redemption"  in  the  accompanying
Prospectus.
 
DISTRIBUTION OF SERIES C DEBENTURES
 
    Under  certain circumstances involving the termination of PacifiCorp Capital
I, Series  C Debentures  may  be distributed  to the  holders  of the  Series  A
Preferred  Securities in liquidation of  PacifiCorp Capital I after satisfaction
of liabilities to creditors  of PacifiCorp Capital I  as provided by  applicable
law.  If distributed to holders of Series A Preferred Securities in liquidation,
the Series C  Debentures will initially  be issued in  the form of  one or  more
global  securities  and  DTC,  or  any successor  depositary  for  the  Series A
Preferred Securities, will act as depositary for the Series C Debentures. It  is
anticipated  that the depositary arrangements for  the Series C Debentures would
be substantially  identical  to those  in  effect  for the  Series  A  Preferred
Securities.  If the Series C Debentures are distributed to the holders of Series
A Preferred Securities upon the liquidation of PacifiCorp Capital I,  PacifiCorp
will  use its best efforts to  list the Series C Debentures  on the NYSE or such
other stock exchanges  or other  organizations, if any,  on which  the Series  A
Preferred Securities are then listed. There can be no assurance as to the market
price  of any  Series C  Debentures that  may be  distributed to  the holders of
Series A Preferred Securities.  For a description  of DTC and  the terms of  the
depositary   arrangements  relating  to   payments,  transfers,  voting  rights,
redemption and other notices  and other matters,  see "Description of  Preferred
Securities -- Book-entry Issuance" in the accompanying Prospectus.
 
REGISTRATION OF SERIES C DEBENTURES
 
    A  global security shall be exchangeable  for Series C Debentures registered
in the names of persons other than DTC  or its nominee only if (i) DTC  notifies
PacifiCorp  that it is unwilling or unable  to continue as a depository for such
global security and no successor depository shall have been appointed, or if  at
any  time DTC  ceases to  be a clearing  agency registered  under the Securities
Exchange Act of  1934, as  amended, at  a time  when DTC  is required  to be  so
registered  to act  as such depository,  (ii) PacifiCorp in  its sole discretion
determines that such  global security shall  be so exchangeable  or (iii)  there
shall  have occurred and be continuing a Debenture Event of Default with respect
to such global security.  Any global security that  is exchangeable pursuant  to
the  preceding  sentence  shall  be  exchangeable  for  definitive  certificates
registered in  such  names  as  DTC  shall direct.  It  is  expected  that  such
instructions will be based upon directions received by DTC from its Participants
with  respect to ownership  of beneficial interests in  such global security. In
the event that Series C Debentures are issued in definitive form, such Series  C
Debentures  will be in  denominations of $25 and  integral multiples thereof and
may be transferred or exchanged at the offices described below.
 
    Payments on Series  C Debentures represented  by a global  security will  be
made  to DTC, as the depositary for the Series C Debentures. In the event Series
C Debentures  are issued  in definitive  form, principal  and interest  will  be
payable, the transfer of the Series C Debentures will be registrable, and Series
C Debentures will be exchangeable for Series C Debentures of other denominations
of  a like aggregate principal amount, at  the corporate office of the Debenture
Trustee in New York, New York, or at the offices of any paying agent or transfer
agent appointed by PacifiCorp, PROVIDED that payment of interest may be made  at
the  option of PacifiCorp by check mailed to the address of the persons entitled
thereto  or  by  wire  transfer   as  provided  under  "Description  of   Junior
Subordinated  Debentures  --  Payment  and Paying  Agents"  in  the accompanying
Prospectus. In addition, if the Series  C Debentures are issued in  certificated
form,  the record dates for payment of interest will be the 15th day of the last
 
                                      S-15
<PAGE>
month of each calendar quarter.  For a description of DTC  and the terms of  the
depositary   arrangements  relating  to   payments,  transfers,  voting  rights,
redemptions and other notices and  other matters, see "Description of  Preferred
Securities -- Book-entry Issuance" in the accompanying Prospectus.
 
                   CERTAIN FEDERAL INCOME TAX CONSIDERATIONS
 
    The following is a summary of the principal United States federal income tax
consequences  of the purchase,  ownership and disposition  of Series A Preferred
Securities. This  summary  only  addresses  the tax  consequences  to  a  person
acquiring  Series  A  Preferred  Securities on  their  original  issue  at their
original offering price and that is (i) an individual citizen or resident of the
United States, (ii) a corporation or partnership organized in or under the  laws
of  the United States or any state thereof  or the District of Columbia or (iii)
an estate or  trust the  income of  which is  subject to  United States  federal
income  tax regardless of  source (a "United States  Person"). This summary does
not address  all tax  consequences that  may be  applicable to  a United  States
Person that is a beneficial owner of the Series A Preferred Securities, nor does
it  address  the tax  consequences to  (i)  persons that  are not  United States
Persons, (ii) persons subject to  special treatment under United States  federal
income  tax  law,  such  as  banks,  insurance  companies,  thrift institutions,
regulated  investment  companies,  real  estate  investment  trusts,  tax-exempt
organizations  and dealers in securities or  currencies, (iii) persons that will
hold Preferred Securities as part of a position in a "straddle" or as part of  a
"hedging,"  "conversion" or  other integrated investment  transaction for United
States federal income tax purposes, (iv) persons whose "functional currency"  is
not  the United  States dollar  or (v)  persons that  do not  hold the  Series A
Preferred Securities as capital assets.
 
    The statements  of  law  or  legal conclusion  set  forth  in  this  summary
constitute  the opinion of Stoel Rives LLP, counsel to PacifiCorp and PacifiCorp
Capital I. This  summary is based  upon the  Internal Revenue Code  of 1986,  as
amended (the "Code"), Treasury Regulations, Internal Revenue Service rulings and
pronouncements and judicial decisions now in effect, all of which are subject to
change  at any time. Such changes may  be applied retroactively in a manner that
could cause the  tax consequences  to vary substantially  from the  consequences
described  below, possibly adversely affecting a  beneficial owner of a Series A
Preferred Security.  In particular,  legislation has  been proposed  that  could
adversely  affect  PacifiCorp's  ability  to deduct  interest  on  the  Series C
Debentures, which would in turn permit  PacifiCorp to cause a redemption of  the
Series   A  Preferred  Securities.  See  "--  Possible  Tax  Law  Changes."  The
authorities  on   which  this   summary  is   based  are   subject  to   various
interpretations  and it  is therefore  possible that  the United  States federal
income tax treatment of  the Series A Preferred  Securities may differ from  the
treatment described below.
 
    PROSPECTIVE  INVESTORS ARE ADVISED TO CONSULT WITH THEIR OWN TAX ADVISORS IN
LIGHT OF THEIR OWN PARTICULAR CIRCUMSTANCES AS TO THE UNITED STATES FEDERAL  TAX
CONSEQUENCES  OF  PURCHASE,  OWNERSHIP  AND DISPOSITION  OF  SERIES  A PREFERRED
SECURITIES, AS WELL AS THE EFFECT OF ANY STATE, LOCAL OR FOREIGN TAX LAWS.
 
CLASSIFICATION OF PACIFICORP CAPITAL I
 
    In connection with the issuance of the Series A Preferred Securities,  Stoel
Rives LLP will render its opinion to the effect that, under then current law and
assuming  compliance with  the terms  of the  Trust Agreement  and certain other
documents, and based on certain facts and assumptions contained in such opinion,
PacifiCorp Capital  I will  be  classified as  a grantor  trust  and not  as  an
association  taxable  as  a corporation  for  United States  federal  income tax
purposes. As a result, each beneficial owner of a Series A Preferred Security (a
"Securityholder") will be treated as owning an undivided beneficial interest  in
the  Series C Debentures.  Accordingly, each Securityholder  will be required to
include in its gross income  its pro rata share  of the original issue  discount
accrued with respect to the Series C Debentures, whether or not cash is actually
distributed  to  the Securityholders.  See "--  Potential Extension  of Interest
Payment Period and Original Issue Discount."  No amount included in income  with
respect  to  the  Series  A  Preferred  Securities  will  be  eligible  for  the
dividends-received deduction.
 
                                      S-16
<PAGE>
CLASSIFICATION OF THE SERIES C DEBENTURES
 
    Based on the advice of its counsel, PacifiCorp believes and intends to  take
the  position  that the  Series C  Debentures  will constitute  indebtedness for
United States federal income tax purposes.  No assurance can be given that  such
position  will not be challenged by the Internal Revenue Service or, if so, that
such challenge will  not be  successful. By  purchasing and  accepting Series  A
Preferred   Securities,  each  Securityholder  agrees  to  treat  the  Series  C
Debentures as indebtedness and the Series A Preferred Securities as evidence  of
an  indirect beneficial ownership  in the Series C  Debentures. The remainder of
this discussion  assumes that  the Series  C Debentures  will be  classified  as
indebtedness of PacifiCorp for United States federal income tax purposes.
 
POTENTIAL EXTENSION OF INTEREST PAYMENT PERIOD AND ORIGINAL ISSUE DISCOUNT
 
    Under  the  Indenture, PacifiCorp  has  the right  to  defer the  payment of
interest on the Series C Debentures at any  time from time to time for a  period
not  exceeding 20  consecutive quarters with  respect to  each Extension Period,
PROVIDED that no Extension Period may extend beyond the maturity of the Series C
Debentures. Because of this option, the  Series C Debentures will be treated  as
having  been issued  with "original  issue discount"  for United  States federal
income tax  purposes.  Accordingly,  a Securityholder  will  recognize  interest
income  (in  the form  of  original issue  discount) on  a  daily basis  under a
constant yield method over the term of the Series C Debentures (including during
any Extension Period),  regardless of the  receipt of cash  with respect to  the
period  to  which such  income  is attributable.  (Subsequent  uses of  the term
"interest" in this summary shall include interest in the form of original  issue
discount.)
 
    As  a  result, Securityholders  of record  during  an Extension  Period will
include interest in gross income in  advance of the receipt of cash,  regardless
of   their  regular  method  of  accounting  for  tax  purposes,  and  any  such
Securityholders who dispose of Series A Preferred Securities prior to the record
date for  the payment  of  Distributions following  such Extension  Period  will
include  interest in gross income but will  not receive any cash related thereto
from PacifiCorp Capital I. Any amount  of original issue discount included in  a
Securityholder's  gross income (whether or not  during an Extension Period) will
increase such Securityholder's tax basis  in its Series A Preferred  Securities,
and  the  amount of  Distributions received  from PacifiCorp  Capital I  by such
Securityholder will  reduce such  Securityholder's  tax basis  in its  Series  A
Preferred Securities.
 
DISTRIBUTION OF SERIES C DEBENTURES TO HOLDERS OF SERIES A PREFERRED SECURITIES
 
    As  described  under  the  caption  "Certain  Terms  of  Series  A Preferred
Securities -- Distribution  of Series  C Debentures," PacifiCorp  will have  the
right,  at any time,  to liquidate PacifiCorp  Capital I and  cause the Series C
Debentures  to  be  distributed  to  the  holders  of  the  Series  A  Preferred
Securities.  Under  current  United  States  federal  income  tax  law, provided
PacifiCorp Capital  I  is  treated as  a  grantor  trust at  the  time  of  such
distribution, such distribution would not be a taxable event to Securityholders.
Such  a distribution  would result in  a Securityholder  receiving directly such
Securityholder's pro  rata share  of  the Series  C Debentures  previously  held
indirectly through PacifiCorp Capital I, with a holding period and aggregate tax
basis  equal to the  holding period and aggregate  tax basis such Securityholder
had  in  such  Securityholder's  Series  A  Preferred  Securities  before   such
distribution.  A  Securityholder will  accrue interest  in  respect of  Series C
Debentures received  from PacifiCorp  Capital I  in the  manner described  above
under  "-- Potential  Extension of  Interest Payment  Period and  Original Issue
Discount."
 
    Following the occurrence of a Tax Event pursuant to which PacifiCorp Capital
I was determined to be an association taxable as a corporation, however, such  a
distribution would be a taxable event to such holders.
 
SALE OR REDEMPTION OF SERIES A PREFERRED SECURITIES
 
    Gain  or loss will be  recognized by a Securityholder on  a sale of Series A
Preferred Securities (including a redemption for cash) in an amount equal to the
difference between the amount realized and
 
                                      S-17
<PAGE>
the Securityholder's adjusted  tax basis  in the Series  A Preferred  Securities
sold  or so redeemed.  Gain or loss  recognized by a  Securityholder on Series A
Preferred Securities held for  more than one year  will generally be treated  as
long-term capital gain or loss.
 
    The  Series A Preferred Securities may trade  at a price that does not fully
reflect the value of accrued but unpaid interest with respect to the  underlying
Series  C Debentures.  A Securityholder  that disposes  of such Securityholder's
Series A Preferred Securities between record dates for payments of Distributions
(and consequently does not receive a Distribution from PacifiCorp Capital I  for
the  period prior to such disposition)  will nevertheless be required to include
as ordinary  income accrued  but  unpaid interest  on  the Series  C  Debentures
through  the date of disposition and to add such amount to such Securityholder's
adjusted tax  basis in  the  Series A  Preferred  Securities disposed  of.  Such
Securityholder  will recognize  a capital  loss on  the disposition  of Series A
Preferred Securities  to the  extent  the selling  price  (which may  not  fully
reflect   the  amount  of  accrued  but   unpaid  interest)  is  less  than  the
Securityholder's adjusted tax basis in the Series A Preferred Securities  (which
will   reflect  accrued  but  unpaid   interest).  Subject  to  certain  limited
exceptions, capital  losses cannot  be  applied to  offset ordinary  income  for
United States federal income tax purposes.
 
BACKUP WITHHOLDING TAX AND INFORMATION REPORTING
 
    The  amount of  original issue  discount accrued  on the  Series A Preferred
Securities held of record by United States Persons (other than corporations  and
other exempt Securityholders) will be reported to the Securityholders and to the
Internal  Revenue Service. "Backup" withholding  at a rate of  31% will apply to
payments  of  interest   to  non-exempt   United  States   Persons  unless   the
Securityholder  furnishes  its  taxpayer  identification  number  in  the manner
prescribed in applicable  Treasury Regulations,  certifies that  such number  is
correct,  certifies as to no loss of exemption from backup withholding and meets
certain other conditions.
 
    Payment of proceeds from disposition of Series A Preferred Securities to  or
through the United States office of a broker is subject to information reporting
and  backup withholding  unless the  holder or  beneficial owner  establishes an
exemption.
 
    Any amounts  withheld from  a Securityholder  under the  backup  withholding
rules  will be  allowed as  a refund or  a credit  against such Securityholder's
United States federal income tax liability, provided the required information is
furnished to the Internal Revenue Service.
 
POSSIBLE TAX LAW CHANGES
 
    On  March  19,  1996,  President  Clinton  released  the  proposed   Revenue
Reconciliation  Bill of 1996  (the "Bill"). The Bill  would, among other things,
generally deny interest deductions  for interest on an  instrument, issued by  a
corporation, that has a maximum weighted average maturity of more than 40 years.
The  Bill  also would  generally  deny interest  deductions  for interest  on an
instrument, issued by a  corporation, that has  a maximum term  of more than  20
years and that is not shown as indebtedness on the separate balance sheet of the
issuer  or, where  the instrument  is issued  to a  related party  (other than a
corporation), where the  holder or  some other  related party  issues a  related
instrument  that  is  not shown  as  indebtedness on  the  issuer's consolidated
balance sheet. The above-described  provisions of the Bill  were proposed to  be
effective  generally for  instruments issued  on or  after December  7, 1995. If
either provision were to apply to  the Series C Debentures, PacifiCorp would  be
unable to deduct interest on the Series C Debentures.
 
    On March 29, 1996, the Chairmen of the Senate Finance and the House Ways and
Means  Committees  issued a  joint statement  to  the effect  that it  was their
intention that the effective date  of the President's legislative proposals,  if
adopted,  would  be  no  earlier than  the  date  of  "appropriate Congressional
action."  As  discussed  above  under   "--  Classification  of  the  Series   C
Debentures,"  PacifiCorp believes and intends to take the position that interest
on the Series C  Debentures is deductible for  United States federal income  tax
purposes. There can be no assurance, however, that current or future legislative
proposals  or final  legislation will  not affect  the ability  of PacifiCorp to
deduct interest  on  the  Series  C  Debentures.  If  legislation  were  enacted
limiting,  in whole or in  part, deductibility by PacifiCorp  of interest on the
Series C  Debentures  for  United  States  federal  income  tax  purposes,  such
enactment  would give rise to a Special  Event, which would permit PacifiCorp to
cause a redemption of the Series A Preferred Securities or a distribution of the
Series C  Debentures, as  described more  fully in  the accompanying  Prospectus
under  "Description of Preferred Securities -- Redemption or Exchange -- Special
Event  Redemption   or  Distribution   of  Corresponding   Junior   Subordinated
Debentures."
 
                                      S-18
<PAGE>
                                  UNDERWRITING
 
    Subject   to  the  terms  and  conditions  of  the  Underwriting  Agreement,
PacifiCorp and PacifiCorp Capital I have  agreed that PacifiCorp Capital I  will
sell to each of the Underwriters named below, and each of such Underwriters, for
whom  Goldman, Sachs & Co.,  Smith Barney Inc., Dean  Witter Reynolds Inc., A.G.
Edwards & Sons, Inc. and Merrill Lynch, Pierce, Fenner & Smith Incorporated  are
acting  as  representatives, has  severally agreed  to purchase  from PacifiCorp
Capital I  the respective  number of  Series A  Preferred Securities  set  forth
opposite its name below:
 
<TABLE>
<CAPTION>
                                                                                    NUMBER OF
                                                                                    SERIES A
                                                                                    PREFERRED
                                   UNDERWRITER                                     SECURITIES
- ---------------------------------------------------------------------------------  -----------
<S>                                                                                <C>
Goldman, Sachs & Co..............................................................    1,148,000
Smith Barney Inc.................................................................    1,148,000
Dean Witter Reynolds Inc.........................................................    1,148,000
A.G. Edwards & Sons, Inc.........................................................    1,148,000
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated...........................................................    1,148,000
Advest, Inc......................................................................       60,000
Robert W. Baird & Co. Incorporated...............................................       60,000
Bear, Stearns & Co. Inc..........................................................      120,000
J.C. Bradford & Co...............................................................       60,000
Alex. Brown & Sons Incorporated..................................................      120,000
Commerzbank Capital Markets Corporation..........................................       60,000
Cowen & Company..................................................................       60,000
Crowell, Weedon & Co.............................................................       60,000
Dain Bosworth Incorporated.......................................................       60,000
Dillon, Read & Co. Inc...........................................................      120,000
EVEREN Securities, Inc...........................................................      120,000
Fahnestock & Co. Inc.............................................................       60,000
J.J.B. Hilliard, W.L. Lyons, Inc.................................................       60,000
Interstate/Johnson Lane Corporation..............................................       60,000
Kennedy, Cabot & Co..............................................................       60,000
Legg Mason Wood Walker, Incorporated.............................................       60,000
Lehman Brothers Inc..............................................................      120,000
McDonald & Company Securities, Inc...............................................       60,000
McGinn, Smith & Co., Inc.........................................................       60,000
Morgan Keegan & Company, Inc.....................................................       60,000
Morgan Stanley & Co. Incorporated................................................      120,000
The Ohio Company.................................................................       60,000
Olde Discount Corporation........................................................       60,000
Oppenheimer & Co., Inc...........................................................      120,000
Piper Jaffray Inc................................................................      120,000
Principal Financial Securities, Inc..............................................       60,000
Prudential Securities Incorporated...............................................      120,000
Ragen MacKenzie Incorporated.....................................................       60,000
Rauscher Pierce Refsnes, Inc.....................................................       60,000
Raymond James & Associates, Inc..................................................       60,000
The Robinson-Humphrey Company, Inc...............................................       60,000
Salomon Brothers Inc.............................................................      120,000
Sutro & Co. Incorporated.........................................................       60,000
Trilon International Inc.........................................................       60,000
Tucker Anthony Incorporated......................................................       60,000
U.S. Clearing Corp...............................................................       60,000
Van Kasper & Company.............................................................       60,000
Wedbush Morgan Securities........................................................       60,000
Wheat, First Securities, Inc.....................................................       60,000
                                                                                   -----------
  Total..........................................................................    8,680,000
                                                                                   -----------
                                                                                   -----------
</TABLE>
 
                                      S-19
<PAGE>
    Subject to the terms and conditions set forth in the Underwriting Agreement,
the  Underwriters are committed to take and  pay for all such Series A Preferred
Securities offered hereby, if any are taken.
 
    The Underwriters propose to offer the Series A Preferred Securities in  part
directly  to the public  at the initial  public offering price  set forth on the
cover page  of this  Prospectus Supplement  and in  part to  certain  securities
dealers  at  such  price less  a  concession  of $0.50  per  Series  A Preferred
Security. The Underwriters may allow, and such dealers may reallow, a concession
not in excess of $0.30  per Series A Preferred  Security to certain brokers  and
dealers.  After the Series A  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 representatives.
 
    In  view  of the  fact  that the  proceeds  from the  sale  of the  Series A
Preferred Securities will be used to purchase the Series C Debentures issued  by
PacifiCorp,  the  Underwriting Agreement  provides that  PacifiCorp will  pay as
Underwriters' Compensation for the Underwriters arranging the investment therein
of such proceeds an amount of  $0.7875 per Series A Preferred Security  ($0.5000
per  Series A Preferred Security sold  to certain institutions) for the accounts
of the several Underwriters.
 
    PacifiCorp and  PacifiCorp Capital  I have  agreed that,  during the  period
beginning  from the  date of  the Underwriting  Agreement and  continuing to and
including the earlier  of (i)  the termination  of trading  restrictions on  the
Series  A Preferred Securities,  as determined by the  Underwriters, and (ii) 30
days after the  closing date, they  will not  offer, sell, contract  to sell  or
otherwise dispose of any Preferred Securities, any other beneficial interests in
the  assets of PacifiCorp  Capital I, or  any preferred securities  or any other
securities of PacifiCorp Capital I or PacifiCorp which are substantially similar
to  the  Series  A  Preferred  Securities,  including  any  guarantee  of   such
securities,  or  any securities  convertible into  or  exchangeable for  or that
represent the right to  receive preferred securities  or any such  substantially
similar  securities of  either PacifiCorp Capital  I or  PacifiCorp, without the
prior written consent of the Representatives, except for the Series A  Preferred
Securities and the Series A Guarantee offered in connection with the offering.
 
    Prior  to this offering,  there has been  no public market  for the Series A
Preferred Securities. The Series  A Preferred Securities will  be listed on  the
NYSE  under the symbol "PPW  PrA". In order to meet  one of the requirements for
listing the Series  A Preferred Securities  on the NYSE,  the Underwriters  will
undertake to sell lots of 100 or more Series A Preferred Securities to a minimum
of  400 beneficial holders. Trading of the  Series A Preferred Securities on the
NYSE is  expected  to commence  within  a  seven-day period  after  the  initial
delivery  of  the  Series A  Preferred  Securities. The  representatives  of the
Underwriters have advised PacifiCorp  that they intend to  make a market in  the
Series  A Preferred Securities prior to commencement of trading on the NYSE, but
are not obligated to do so and may discontinue market making at any time without
notice. No assurance can be given as to the liquidity of the trading market  for
the Series A Preferred Securities.
 
    PacifiCorp  and PacifiCorp  Capital I have  agreed to  indemnify the several
Underwriters  against  certain  liabilities,  including  liabilities  under  the
Securities Act of 1933, as amended, or to contribute to payments the Underwriter
may be required to make in respect thereof.
 
    Certain  of the Underwriters or their  affiliates have provided from time to
time, and expect  to provide  in the  future, investment  or commercial  banking
services  to PacifiCorp and its affiliates, for which such Underwriters or their
affiliates have received or will receive customary fees and commissions.
 
                                 LEGAL OPINIONS
 
    Certain matters of  Delaware law relating  to the validity  of the Series  A
Preferred Securities, the enforceability of the Trust Agreement and the creation
of  PacifiCorp  Capital I  will be  passed  upon by  Richards, Layton  & Finger,
special Delaware counsel to PacifiCorp and PacifiCorp Capital I. The validity of
the Series A  Guarantee and  the Series  C Debentures  will be  passed upon  for
PacifiCorp  by Stoel  Rives LLP, Portland,  Oregon, and for  the Underwriters by
Winthrop, Stimson,  Putnam  &  Roberts,  New York,  New  York.  Certain  matters
relating  to United States federal income tax considerations will be passed upon
by Stoel Rives LLP, counsel to PacifiCorp and PacifiCorp Capital I.
 
                                      S-20
<PAGE>
                                  $250,000,000
 
            PACIFICORP                      PACIFICORP CAPITAL I
  JUNIOR SUBORDINATED DEBENTURES            PACIFICORP CAPITAL II
                                       PREFERRED SECURITIES GUARANTEED
                                       TO THE EXTENT THE ISSUER TRUSTS
                                                    HAVE
                                        FUNDS AS SET FORTH HEREIN BY
                                                 PACIFICORP
 
    PacifiCorp,  an  Oregon corporation  ("PacifiCorp"), may  from time  to time
offer in one  or more  series or  issuances its  junior subordinated  deferrable
interest   debentures  (the   "Junior  Subordinated   Debentures").  The  Junior
Subordinated Debentures will be unsecured and subordinate and junior in right of
payment  to  Senior  Indebtedness  (as   defined  herein)  of  PacifiCorp.   See
"Description  of  the  Junior  Subordinated  Debentures  --  Subordination."  If
provided in a  related prospectus supplement  accompanying this Prospectus  (the
"Prospectus  Supplement"), PacifiCorp will  have the right  to defer payments of
interest on any  series of Junior  Subordinated Debentures at  any time or  from
time  to time  for such  number of  consecutive interest  payment periods (which
shall not extend beyond the maturity of the Junior Subordinated Debentures) with
respect to each deferral period as may be specified in the Prospectus Supplement
(each,  an  "Extension  Period").   See  "Description  of  Junior   Subordinated
Debentures  -- Option to Extend Interest  Payments" and "-- Certain Covenants of
PacifiCorp."
 
    PacifiCorp Capital I and PacifiCorp Capital  II, each a trust created  under
the  laws of the State of Delaware  (each an "Issuer Trust" and collectively the
"Issuer Trusts"), may severally offer,  from time to time, preferred  securities
(the   "Preferred  Securities")  representing   preferred  undivided  beneficial
interests in the assets of  each Issuer Trust. PacifiCorp  will be the owner  of
the  common securities  (the "Common Securities")  representing common undivided
beneficial interests in the assets of each Issuer Trust. The payment of periodic
cash distributions  ("Distributions") with  respect to  Preferred Securities  of
each  Issuer Trust,  and payments on  liquidation or redemption  with respect to
such Preferred Securities,  in each case  to the  extent of funds  held by  such
Issuer  Trust, are each irrevocably guaranteed by PacifiCorp as described herein
(each, a "Guarantee"). See "Description of Guarantees." PacifiCorp's obligations
under each Guarantee will be subordinate and  junior in right of payment to  all
Senior  Indebtedness of PacifiCorp. Concurrently with  the issuance by an Issuer
Trust of its Preferred  Securities, such Issuer Trust  will invest the  proceeds
thereof  and any  contributions made  by PacifiCorp  in respect  of PacifiCorp's
purchase  of  the  Common  Securities  in  a  corresponding  series  of   Junior
Subordinated  Debentures  (the "Corresponding  Junior  Subordinated Debentures")
with  terms  corresponding  to  the  terms  of  such  Issuer  Trust's  Preferred
Securities.  The Corresponding Junior  Subordinated Debentures will  be the sole
assets of  each  Issuer  Trust,  and payments  under  the  Corresponding  Junior
Subordinated  Debentures and the  Expense Agreement (as  defined herein) will be
the only revenue of each Issuer  Trust. PacifiCorp may redeem the  Corresponding
Junior  Subordinated  Debentures  (and  cause  the  redemption  of  the  related
Preferred  Securities)  or  may  terminate  each  Issuer  Trust  and  cause  the
Corresponding Junior Subordinated Debentures to be distributed to the holders of
Preferred Securities in liquidation of their interests in such Issuer Trust. See
"Description   of   Preferred  Securities   --  Liquidation   Distribution  Upon
Termination."
                                                        (CONTINUED ON NEXT PAGE)
 
                            ------------------------
 
     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.
 
                              -------------------
 
                  The date of this Prospectus is June 5, 1996
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
    Holders of the Preferred Securities will be entitled to receive preferential
cumulative  cash Distributions accumulating  from the date  of original issuance
and payable periodically as specified  in the related Prospectus Supplement.  If
provided in the related Prospectus Supplement, PacifiCorp will have the right to
defer  payments of interest  on any series  of Corresponding Junior Subordinated
Debentures at any time or  from time to time for  one or more Extension  Periods
(which  shall  not  extend  beyond the  maturity  of  such  Corresponding Junior
Subordinated Debentures). If interest payments are so deferred, Distributions on
the related series of Preferred Securities will also be deferred and  PacifiCorp
will  not  be permitted,  subject  to certain  exceptions  set forth  herein, to
declare, set aside or  pay any cash distributions  with respect to  PacifiCorp's
capital  stock or  debt securities that  rank PARI  PASSU with or  junior to the
Corresponding  Junior  Subordinated  Debentures.  During  an  Extension  Period,
interest  on the Corresponding  Junior Subordinated Debentures  will continue to
accrue (and the amount of Distributions to which holders of Preferred Securities
are entitled will accumulate)  at the rate  per annum set  forth in the  related
Prospectus  Supplement. See  "Description of  Junior Subordinated  Debentures --
Option to Extend Interest Payment Date" and "-- Certain Covenants of PacifiCorp"
and "Description of Preferred Securities -- Distributions."
 
    The  Junior  Subordinated  Debentures  and  the  Preferred  Securities  (the
"Offered  Securities") may be offered  in amounts, at prices  and on terms to be
determined at the time of offering,  PROVIDED that the aggregate initial  public
offering  price of all Junior  Subordinated Debentures (other than Corresponding
Junior Subordinated  Debentures)  and  Preferred  Securities  shall  not  exceed
$250,000,000. Certain specific terms of the Offered Securities will be described
in the Prospectus Supplement, including, without limitation and where applicable
and  to the extent not set forth herein:  (i) in the case of Junior Subordinated
Debentures, the specific designation, aggregate principal amount, denominations,
maturity, interest payment dates, interest rate (which may be fixed or variable)
or method  of  calculating interest,  if  any, applicable  Extension  Period  or
interest  deferral terms, if  any, place or places  where principal, premium, if
any, and interest, if any, will be payable, terms of redemption, if any, sinking
fund provisions, if any,  terms for conversion or  exchange, if any, into  other
securities,  the initial offering or purchase price, methods of distribution and
any other  special terms;  and (ii)  in the  case of  Preferred Securities,  the
identity   of  the  Issuer  Trust,  specific  title,  aggregate  amount,  stated
liquidation preference,  distribution rate  or the  method of  calculating  such
rate,  applicable Extension Period or Distribution deferral terms, if any, dates
on which and place or places where Distributions will be payable, voting rights,
any redemption  provisions, terms  for  any conversion  or exchange  into  other
securities, initial offering or purchase price, methods of distribution, and any
other special terms.
 
    The  Prospectus  Supplement will  also  contain information,  as applicable,
concerning certain United States federal  income tax considerations relating  to
the Offered Securities.
 
    The  Offered Securities may  be sold directly  by PacifiCorp, through agents
designated from time to  time or through underwriters  or dealers. See "Plan  of
Distribution."  If any agents of PacifiCorp  or underwriters are involved in the
sale of any  Offered Securities  in respect of  which this  Prospectus is  being
delivered,  the  names  of  such  agents  or  underwriters  and  any  applicable
commissions or discounts will be set  forth in a Prospectus Supplement. The  net
proceeds  to PacifiCorp from  such sale also  will be set  forth in a Prospectus
Supplement or  Prospectus  Supplements.  The Prospectus  Supplement  will  state
whether  the  Offered  Securities  will be  listed  on  any  national securities
exchange or the Nasdaq National Market. If the Offered Securities are not listed
on any national securities exchange or the Nasdaq National Market, there can  be
no  assurance that  there will  be a  liquid secondary  market for  such Offered
Securities.
 
    This Prospectus may not  be used to consummate  sales of Offered  Securities
unless   accompanied  by  a  Prospectus  Supplement  relating  to  such  Offered
Securities.
 
                                       2
<PAGE>
                             AVAILABLE INFORMATION
 
    PacifiCorp  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 Securities and Exchange
Commission (the  "Commission"). Such  reports and  other information  (including
proxy  and  information statements)  filed by  PacifiCorp  can be  inspected and
copied at public reference facilities maintained by the Commission at 450  Fifth
Street,  N.W., Room 1024, Washington, D.C.  10549, and at the following Regional
Offices of the Commission: New York Regional Office, 7 World Trade Center,  13th
Floor,  New York, New York 10048,  and Chicago Regional Office, Citicorp Center,
500 W.  Madison Street,  Suite 1400,  Chicago, Illinois  60661. Copies  of  such
material  can be obtained from the Public Reference Section of the Commission at
450 Fifth Street, N.W., Washington, D.C.  20549, upon payment of the  prescribed
rates.  The Common Stock of PacifiCorp is  listed on the New York Stock Exchange
and the Pacific Stock Exchange. Reports, proxy statements and other  information
concerning  PacifiCorp can  also be inspected  at their  respective offices: New
York Stock Exchange (the "NYSE"), 20 Broad Street, New York, New York 10005, and
the Pacific Stock Exchange, 301 Pine Street, San Francisco, California 94104.
 
    PacifiCorp and the  Issuer Trusts  have filed  with the  Commission a  joint
Registration  Statement  under  the  Securities Act  of  1933,  as  amended (the
"Securities  Act"),  with  respect  to  the  securities  offered  hereby.   This
Prospectus   does  not  contain  all  of  the  information  set  forth  in  such
Registration Statement and  the exhibits thereto.  For further information  with
respect  to PacifiCorp, the Issuer Trusts  and the Offered Securities, reference
is hereby made to such  Registration Statement, including the exhibits  thereto,
which  may be examined  at the Commission's principal  office, 450 Fifth Street,
N.W., Washington,  D.C. 20549,  or copies  of  which may  be obtained  from  the
Commission at such office upon payment of the fees prescribed by the Commission.
 
    No  separate financial  statements of the  Issuer Trusts  have been included
herein. PacifiCorp and  the Issuer Trusts  do not consider  that such  financial
statements  would be material to holders  of Preferred Securities offered hereby
because each  Issuer Trust  is a  newly formed  special purpose  entity, has  no
operating history, has no independent operations and is not engaged in, and does
not  propose to engage in, any activity other  than as set forth below. See "The
Issuer Trusts,"  "Description  of  the Preferred  Securities,"  "Description  of
Guarantees" and "Description of Corresponding Junior Subordinated Debentures."
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
    The  following documents filed by PacifiCorp with the Commission pursuant to
the Exchange Act are incorporated in this Prospectus by reference:
 
    (1) PacifiCorp's Annual Report on Form 10-K for the year ended December  31,
1995;
 
    (2)  PacifiCorp's Quarterly Report on Form  10-Q for the quarter ended March
31, 1996; and
 
    (3) PacifiCorp's Current  Reports on  Form 8-K  dated January  16, 1996  and
February 12, 1996.
 
    All  documents filed by  PacifiCorp pursuant to Section  13(a), 13(c), 14 or
15(d) of the Exchange  Act after the  date of this Prospectus  and prior to  the
termination  of this offering 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 (such documents, and the documents enumerated above, being hereinafter
referred  to as "Incorporated Documents";  PROVIDED, HOWEVER, that all documents
subsequently filed by PacifiCorp  pursuant to Section 13  or 14 of the  Exchange
Act  in each year during which the offering made by this Prospectus is in effect
prior to the filing  with the Commission of  PacifiCorp's Annual Report on  Form
10-K  covering such year shall not  be Incorporated Documents or be incorporated
by reference in this Prospectus or be  a part hereof from and after such  filing
of such Annual Report on Form 10-K).
 
    Any  statement contained in  an Incorporated Document shall  be deemed to be
modified or superseded  for purposes  of this Prospectus  to the  extent that  a
statement contained herein or in any other
 
                                       3
<PAGE>
subsequently  filed Incorporated Document modifies or supersedes such statement.
Any such statement so modified or superseded  shall not be deemed, except as  so
modified or superseded, to constitute a part of this Prospectus.
 
    PACIFICORP  HEREBY UNDERTAKES  TO PROVIDE WITHOUT  CHARGE TO  EACH PERSON TO
WHOM A COPY OF THIS PROSPECTUS IS  DELIVERED, ON THE WRITTEN OR ORAL REQUEST  OF
ANY  SUCH PERSON, A COPY OF ANY OR ALL OF THE INCORPORATED DOCUMENTS, OTHER THAN
EXHIBITS TO SUCH DOCUMENTS, UNLESS  SUCH EXHIBITS ARE SPECIFICALLY  INCORPORATED
BY  REFERENCE  THEREIN.  REQUESTS  SHOULD  BE  DIRECTED  TO  PACIFICORP,  700 NE
MULTNOMAH, SUITE 1600,  PORTLAND, OREGON 97232,  ATTENTION: RICHARD T.  O'BRIEN,
SENIOR  VICE  PRESIDENT  AND  CHIEF FINANCIAL  OFFICER,  TELEPHONE  NUMBER (503)
731-2000. THE INFORMATION  RELATING TO PACIFICORP  CONTAINED IN THIS  PROSPECTUS
DOES  NOT  PURPORT TO  BE COMPREHENSIVE  AND  SHOULD BE  READ TOGETHER  WITH THE
INFORMATION CONTAINED IN THE INCORPORATED DOCUMENTS.
 
    NO PERSON  HAS  BEEN AUTHORIZED  TO  GIVE ANY  INFORMATION  OR TO  MAKE  ANY
REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS OR IN ANY PROSPECTUS SUPPLEMENT,
AND,  IF GIVEN OR MADE, SUCH INFORMATION  OR REPRESENTATION SHOULD NOT BE RELIED
UPON AS HAVING BEEN AUTHORIZED. THIS PROSPECTUS AND ANY PROSPECTUS SUPPLEMENT DO
NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY ANY OF  THE
SECURITIES  OFFERED HEREBY OR THEREBY IN ANY  JURISDICTION TO ANY PERSON TO WHOM
IT IS UNLAWFUL TO MAKE SUCH OFFER IN SUCH JURISDICTION.
 
    NEITHER THE DELIVERY OF  THIS PROSPECTUS AND  THE PROSPECTUS SUPPLEMENT  NOR
ANY SALE MADE HEREUNDER OR THEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY
IMPLICATION  THAT THERE HAS BEEN  NO CHANGE IN THE  AFFAIRS OF PACIFICORP OR ITS
SUBSIDIARIES SINCE  THE  DATE OF  THIS  PROSPECTUS OR  THE  DATE OF  THE  LATEST
PROSPECTUS SUPPLEMENT, AS THE CASE MAY BE.
 
                                   PACIFICORP
 
    PacifiCorp  is an  electric utility  headquartered in  Portland, Oregon that
conducts a  retail  electric utility  business  through Pacific  Power  &  Light
Company  and Utah  Power &  Light Company, and  engages in  power production and
sales on a wholesale basis under the name PacifiCorp. PacifiCorp is the indirect
owner,  through   PacifiCorp   Holdings,  Inc.   (a   wholly-owned   subsidiary)
("Holdings"),  of 100%  of each of  Powercor Australia  Limited ("Powercor"), an
Australian electric distribution  Company, and Pacific  Telecom, Inc.  ("Pacific
Telecom"),  a leading provider of local  telephone exchange service to rural and
suburban markets.
 
    PacifiCorp furnishes electric service  to approximately 1,300,000  customers
in  portions of seven western states:  California, Idaho, Montana, Oregon, Utah,
Washington and  Wyoming.  Powercor  serves approximately  570,000  customers  in
suburban  Melbourne and the western and central regions of the State of Victoria
in southeast  Australia. Pacific  Telecom,  through its  subsidiaries,  provides
local telephone service and access to the long-distance network in Alaska, seven
other  western  states and  three  midwestern states,  provides  cellular mobile
telephone services in  six states and  is engaged  in sales of  capacity in  and
operation  of a submarine fiber optic cable between the United States and Japan.
Holdings also has interests in  the independent power and cogeneration  business
through  its wholly-owned subsidiary, Pacific  Generation Company, and continues
to liquidate portions of the loan, leasing and real estate investment  portfolio
of its wholly-owned subsidiary, PacifiCorp Financial Services, Inc. ("PFS"). PFS
expects  to retain only its tax advantaged investments in leveraged lease assets
(primarily aircraft)  and affordable  housing, and  is limiting  its pursuit  of
tax-advantaged investment opportunities to affordable housing.
 
    The  principal  executive  offices  of  PacifiCorp  are  located  at  700 NE
Multnomah, Suite 1600,  Portland, Oregon  97232; the telephone  number is  (503)
731-2000.
 
                               THE ISSUER TRUSTS
 
    Each  Issuer Trust is a statutory  business trust created under Delaware law
pursuant to (i) a trust agreement  executed by PacifiCorp, as depositor of  such
Issuer Trust, the Delaware Trustee (as defined
 
                                       4
<PAGE>
herein)  of such Issuer Trust, the Property  Trustee (as defined herein) of such
Issuer Trust and an  Administrative Trustee (as defined  herein) of such  Issuer
Trust  and (ii) the filing of a certificate of trust with the Delaware Secretary
of State. Each  trust agreement  will be amended  and restated  in its  entirety
(each,  as so  amended and restated,  a "Trust Agreement")  substantially in the
form filed as an exhibit to the Registration Statement of which this  Prospectus
forms  a part. Each Trust Agreement will  be qualified as an indenture under the
Trust Indenture Act of 1939, as amended (the "Trust Indenture Act"). Each Issuer
Trust exists for the exclusive purposes of (i) issuing and selling its Preferred
Securities and Common Securities, (ii) using the proceeds from the sale of  such
Preferred  Securities and Common Securities to acquire a corresponding series of
Corresponding Junior  Subordinated Debentures  issued  by PacifiCorp  and  (iii)
engaging  in  only those  other activities  necessary, convenient  or incidental
thereto. Accordingly, such Corresponding Junior Subordinated Debentures will  be
the  sole assets  of such  Issuer Trust,  and payments  under such Corresponding
Junior Subordinated  Debentures  and the  Expense  Agreement will  be  the  sole
revenue of such Issuer Trust.
 
    All  of  the  Common Securities  will  be  owned by  PacifiCorp.  The Common
Securities of an Issuer Trust  will rank PARI PASSU,  and payments will be  made
thereon  PRO RATA,  with the Preferred  Securities of such  Issuer Trust, except
that upon the occurrence and  continuance of an event  of default under a  Trust
Agreement  resulting from a Debenture Event  of Default (as defined herein), the
rights of PacifiCorp as holder of the Common Securities to payment in respect of
Distributions and payments  upon liquidation,  redemption or  otherwise will  be
subordinated  to the rights of  the holders of the  Preferred Securities of such
Issuer Trust.  See  "Description of  Preferred  Securities --  Subordination  of
Common   Securities."  PacifiCorp  will  acquire  Common  Securities  having  an
aggregate Liquidation Amount (as  defined herein) equal to  not less than 3%  of
the total capital of each Issuer Trust.
 
    Unless  otherwise specified  in the  applicable Prospectus  Supplement, each
Issuer Trust has a term of approximately 45 years, but may terminate earlier  as
provided  in the  applicable Trust Agreement.  Each Issuer  Trust's business and
affairs are conducted by its trustees, which will be appointed by PacifiCorp  as
holder of the Common Securities.
 
    Unless  otherwise  specified in  the  applicable Prospectus  Supplement, the
trustees will  be The  Bank of  New York,  as Property  Trustee, (the  "Property
Trustee"),  The  Bank  of New  York  (Delaware),  as the  Delaware  Trustee (the
"Delaware Trustee"), and two individual trustees (the "Administrative Trustees")
who are employees or  officers of or  affiliated with PacifiCorp  (collectively,
the  "Issuer Trustees"). The Bank of New  York, as Property Trustee, will act as
sole indenture trustee  under each  Trust Agreement for  purposes of  compliance
with  the Trust  Indenture Act. The  Bank of New  York will also  act as trustee
under the Guarantee and the Indenture (each as defined herein). See "Description
of Guarantees" and "Description of  Junior Subordinated Debentures." The  holder
of the Common Securities, or the holders of a majority in liquidation preference
of  the Preferred  Securities if  a Debenture Event  of Default  under the Trust
Agreement has occurred and is continuing, will be entitled to appoint, remove or
replace the Property Trustee and/or the  Delaware Trustee. In no event will  the
holders of the Preferred Securities have the right to vote to appoint, remove or
replace  the Administrative Trustees; such  voting rights are vested exclusively
in the  holder of  the Common  Securities. The  duties and  obligations of  each
Issuer  Trustee are governed by the  applicable Trust Agreement. PacifiCorp will
pay all fees and expenses related to  each Issuer Trust and the offering of  the
Preferred  Securities and will  pay, directly or  indirectly, all ongoing costs,
expenses and liabilities of each Issuer Trust. The principal executive office of
each Issuer  Trust is  700 NE  Multnomah, Suite  1600, Portland,  Oregon  97232;
telephone number (503) 731-2000.
 
                                USE OF PROCEEDS
 
    Unless otherwise indicated in the Prospectus Supplement, the net proceeds to
be  received by PacifiCorp from the issuance  and sale of the Offered Securities
will initially become part of the general  funds of PacifiCorp and will be  used
to  repay all or a portion  of PacifiCorp's short-term borrowings outstanding at
the time of  issuance of the  Offered Securities  or may be  applied to  utility
asset  purchases, new  construction or  other corporate  purposes, including the
refunding of long-term debt or other senior
 
                                       5
<PAGE>
securities. Reference  is made  to the  Incorporated Documents  with respect  to
PacifiCorp's  capital requirements and its  general financing plans. Each Issuer
Trust will invest all proceeds received from the sale of Preferred Securities in
Corresponding Junior Subordinated Debentures.
 
                CONSOLIDATED RATIOS OF EARNINGS TO FIXED CHARGES
 
    The ratios of earnings  to fixed charges of  PacifiCorp for the years  ended
December  31, 1991 through 1995  and for the three  months ended March 31, 1996,
calculated as required by the Commission, are 2.4x, 1.6x, 2.5x, 3.0x, 2.9x,  and
2.7x,  respectively. Excluding the effect of special charges, the ratio was 1.9x
for the  year  1992.  For  the purpose  of  computing  such  ratios,  "earnings"
represents  the aggregate  of (a) income  from continuing  operations, (b) taxes
based on income from continuing operations, (c) minority interest in the  income
of  majority-owned subsidiaries that  have fixed charges,  (d) fixed charges and
(e) undistributed losses (income) of less than 50% owned affiliates without loan
guarantees.  "Fixed  charges"  represents  consolidated  interest  charges,   an
estimated  amount representing the interest factor  in rents and preferred stock
dividend requirements of majority-owned subsidiaries, and excludes  discontinued
operations.
 
                 DESCRIPTION OF JUNIOR SUBORDINATED DEBENTURES
 
    The Junior Subordinated Debentures may be issued from time to time in one or
more  series under  an Indenture dated  as of  May 1, 1995,  as supplemented and
amended from time to time (the "Indenture"), between PacifiCorp and The Bank  of
New  York, as  trustee (the  "Debenture Trustee").  PacifiCorp may  issue Junior
Subordinated Debentures to the public or to institutional investors as described
under "Plan of Distribution" or Corresponding Junior Subordinated Debentures  to
the  Issuer Trusts in connection with  the issuance of Preferred Securities. The
following summary is subject to the provisions of and is qualified by  reference
to  the Indenture, which is filed as an exhibit to the Registration Statement of
which this Prospectus  forms a part,  and to the  Trust Indenture Act.  Whenever
particular  provisions or defined terms in  the Indenture are referred to herein
or in a Prospectus Supplement, such provisions or defined terms are incorporated
herein or therein by reference. Section  and Article references used herein  are
references to provisions of the Indenture unless otherwise noted.
 
GENERAL
 
    Each  series of Junior Subordinated Debentures will rank PARI PASSU with all
other series  of  Junior Subordinated  Debentures,  and will  be  unsecured  and
subordinated  and junior in right of payment to the extent and in the manner set
forth in  the  Indenture  to  all Senior  Indebtedness  (as  defined  below)  of
PacifiCorp.  See "-- Subordination." As  the Junior Subordinated Debentures will
be issued by PacifiCorp, the Junior Subordinated Debentures effectively will  be
subordinate  to all obligations of PacifiCorp's  subsidiaries, and the rights of
PacifiCorp's creditors, including holders of Junior Subordinated Debentures,  to
participate   in   the  assets   of  such   subsidiaries  upon   liquidation  or
reorganization will be  junior to  the rights of  the holders  of all  preferred
stock,  indebtedness  and  other  liabilities of  such  subsidiaries,  which may
include  trade  payables,   obligations  to  banks   under  credit   facilities,
guarantees,  pledges,  support arrangements,  bonds,  capital leases,  notes and
other obligations.
 
    The Indenture provides  that Junior  Subordinated Debentures  may be  issued
from time to time in one or more series pursuant to an indenture supplemental to
the  Indenture  or a  resolution  of PacifiCorp's  Board  of Directors  (each, a
"Supplemental Indenture").  (Section  2.01) The  Indenture  does not  limit  the
aggregate  principal amount of Junior Subordinated Debentures that may be issued
thereunder. PacifiCorp's Second Restated Articles of Incorporation, as  amended,
limit  the amount of unsecured debt that  PacifiCorp may issue to the equivalent
of 30% of the total of all  secured indebtedness and total equity. At March  31,
1996, approximately $874 million of unsecured debt of PacifiCorp was outstanding
and  approximately $1.3  billion of  additional unsecured  debt could  have been
issued under this provision. The Indenture does not contain any provisions  that
would limit the ability of PacifiCorp to incur indebtedness or that would afford
holders  of Junior Subordinated  Debentures protection in the  event of a highly
leveraged or  similar transaction  involving PacifiCorp  or in  the event  of  a
change of control.
 
                                       6
<PAGE>
    Reference  is made to  the Prospectus Supplement for  the following terms of
the series  of Junior  Subordinated Debentures  being offered  thereby: (i)  the
specific  title of  such Junior Subordinated  Debentures; (ii) any  limit on the
aggregate principal amount  of such  Junior Subordinated  Debentures; (iii)  the
date  or dates on which the principal  of such Junior Subordinated Debentures is
payable; (iv) the  rate or rates  at which such  Junior Subordinated  Debentures
will  bear interest or the manner of calculation  of such rate or rates; (v) the
date or dates from which such interest shall accrue, the interest payment  dates
on  which such interest will  be payable or the  manner of determination of such
interest payment dates and the record dates for the determination of holders  to
whom  interest is payable on any such interest payment dates; (vi) the right, if
any, of PacifiCorp to  extend the interest payment  periods and the duration  of
such extension; (vii) the period or periods within which, the price or prices at
which  and  the  terms  and  conditions  upon  which  such  Junior  Subordinated
Debentures may be redeemed, in  whole or in part,  at the option of  PacifiCorp;
(viii)  the obligation, if any, of PacifiCorp  to redeem or purchase such Junior
Subordinated Debentures pursuant to any sinking fund or analogous provisions  or
at  the option  of the holder  thereof and the  period or periods,  the price or
prices at which and the terms and conditions upon which such Junior Subordinated
Debentures shall be redeemed  or purchased, in whole  or part, pursuant to  such
obligation;  (ix) the form of such  Junior Subordinated Debentures; (x) if other
than denominations of $25 or any integral multiple thereof, the denominations in
which such Junior Subordinated  Debentures shall be issuable;  (xi) any and  all
other  terms  with  respect  to  such  series;  and  (xii)  whether  such Junior
Subordinated Debentures are issuable as a global security, and in such case, the
identity of the depositary. (Section 2.01)
 
SUBORDINATION
 
    The Indenture provides that  Junior Subordinated Debentures are  subordinate
and  junior in  right of  payment to  the prior  payment in  full of  all Senior
Indebtedness of PacifiCorp as provided in the Indenture. No payment of principal
of (including redemption  and sinking  fund payments),  or premium,  if any,  or
interest  on,  the Junior  Subordinated  Debentures may  be  made if  any Senior
Indebtedness is not paid when due,  any applicable grace period with respect  to
such  default has ended and such default has not been cured or waived, or if the
maturity of any Senior Indebtedness has  been accelerated because of a  default.
Upon  any payment or  distribution of assets to  creditors upon any dissolution,
winding-up, liquidation or  reorganization of PacifiCorp,  whether voluntary  or
involuntary or in bankruptcy, insolvency, receivership or other proceedings, all
amounts  due or to  become due on all  Senior Indebtedness must  be paid in full
before the holders of the Junior Subordinated Debentures are entitled to receive
or retain any  payment. The  rights of the  holders of  the Junior  Subordinated
Debentures   will  be  subrogated  to  the  rights  of  the  holders  of  Senior
Indebtedness  to  receive  payments   or  distributions  applicable  to   Senior
Indebtedness  until all amounts owing on  the Junior Subordinated Debentures are
paid in  full. (Sections  14.01  to 14.04)  The Junior  Subordinated  Debentures
effectively  will  also  be  subordinate  to  all  obligations  of  PacifiCorp's
subsidiaries. See "-- General."
 
    The term "Senior Indebtedness" shall mean  the principal of and premium,  if
any, and interest on and any other payment due pursuant to any of the following,
whether  outstanding at  the date  of execution  of the  Indenture or thereafter
incurred, created or assumed:
 
    (a) all indebtedness of PacifiCorp evidenced by notes, debentures, bonds  or
other securities sold by PacifiCorp for money;
 
    (b) all indebtedness of others of the kinds described in paragraph (a) above
assumed  by or guaranteed in any manner by PacifiCorp or in effect guaranteed by
PacifiCorp through an agreement to purchase, contingent or otherwise; and
 
    (c) all  renewals, extensions  or refundings  of indebtedness  of the  kinds
described in either of paragraphs (a) and (b) above;
 
unless,  in  the  case of  any  particular indebtedness,  renewal,  extension or
refunding, the instrument creating or evidencing  the same or the assumption  or
guarantee  of  the  same  expressly provides  that  such  indebtedness, renewal,
extension or refunding is not superior in  right of payment to or is PARI  PASSU
 
                                       7
<PAGE>
with the Junior Subordinated Debentures. Such Senior Indebtedness shall continue
to  be Senior  Indebtedness and  entitled to  the benefits  of the subordination
provisions  contained   in  the   Indenture  irrespective   of  any   amendment,
modification or waiver of any term of such Senior Indebtedness. (Section 1.01)
 
    The  Indenture does  not limit the  aggregate amount  of Senior Indebtedness
which may be  issued. As of  March 31, 1996,  Senior Indebtedness of  PacifiCorp
aggregated approximately $3.7 billion.
 
CERTAIN COVENANTS OF PACIFICORP
 
    If there shall have occurred any event that would, with the giving of notice
or  the passage of time, or both,  constitute a Debenture Event of Default under
the Indenture, as  described under "--  Debenture Events of  Default" below,  or
PacifiCorp  exercises its option to extend the interest payment period described
in clause  (vi)  under  "--  General" above,  PacifiCorp  will  not,  until  all
defaulted  interest  on  the  Junior Subordinated  Debentures  and  all interest
accrued on the Junior Subordinated Debentures during any such extended  interest
payment  period and all principal  and premium, if any,  then due and payable on
the Junior Subordinated Debentures  shall have been paid  in full, (i)  declare,
set  aside  or  pay  any  dividend  or  distribution  on  any  capital  stock of
PacifiCorp, including the Common  Stock of PacifiCorp,  except for dividends  or
distributions  in shares of its capital stock  or in rights to acquire shares of
its capital stock, or (ii) repurchase, redeem or otherwise acquire, or make  any
sinking  fund  payment for  the purchase  or  redemption of,  any shares  of its
capital stock (except by conversion into  or exchange for shares of its  capital
stock  and except for a  redemption, purchase or other  acquisition of shares of
its capital stock made for the purpose of an employee incentive plan or  benefit
plan  of  PacifiCorp  or  any  of  its  subsidiaries  and  except  for mandatory
redemption or sinking  fund payments  with respect  to any  series of  Preferred
Stock  of PacifiCorp  that are subject  to mandatory redemption  or sinking fund
requirements, PROVIDED  that  the aggregate  stated  value of  all  such  series
outstanding  at the time of any such payment does not exceed five percent of the
aggregate of (1)  the total principal  amount of all  bonds or other  securities
representing  secured  indebtedness issued  or  assumed by  PacifiCorp  and then
outstanding and (2) the capital  and surplus of PacifiCorp  to be stated on  the
books  of account of PacifiCorp after  giving effect to such payment); PROVIDED,
HOWEVER, that any moneys deposited in any  sinking fund and not in violation  of
this  provision may thereafter be applied to  the purchase or redemption of such
Preferred Stock in accordance with the terms of such sinking fund without regard
to the restrictions contained in this provision. (Section 4.06) As of March  31,
1996,  the aggregate stated value of such series of PacifiCorp's Preferred Stock
outstanding was  approximately  $219 million,  which  represented  approximately
three  percent of the aggregate of clauses (1)  and (2) above at such date. With
respect to  any  issuance of  Corresponding  Junior Subordinated  Debentures  in
connection  with  the issuance  of  Preferred Securities,  PacifiCorp  will make
certain additional covenants  as described under  "Description of  Corresponding
Junior Subordinated Debentures."
 
FORM, EXCHANGE, REGISTRATION AND TRANSFER
 
    Each  series of Junior Subordinated Debentures  will be issued in registered
form and in  certificated form  or will  be represented  by one  or more  global
securities.  If  not  represented  by  one  or  more  global  securities, Junior
Subordinated Debentures may be presented for registration of transfer (with  the
form  of transfer endorsed thereon duly executed)  or exchange, at the office of
the Registrar or at  the office of any  transfer agent designated by  PacifiCorp
for  such purpose with  respect to any series  of Junior Subordinated Debentures
and referred to in an  applicable Prospectus Supplement, without service  charge
and upon payment of any taxes and other governmental charges as described in the
Indenture. Such transfer or exchange will be effected upon the Registrar or such
transfer  agent, as the case may be, being satisfied with the documents of title
and identity of the  person making the request.  (Section 2.05) If a  Prospectus
Supplement refers to any transfer agent (in addition to the Registrar) initially
designated  by  PacifiCorp with  respect to  any  series of  Junior Subordinated
Debentures, PacifiCorp  may at  any time  rescind the  designation of  any  such
transfer  agent  or approve  a change  in  the location  through which  any such
transfer agent  acts, except  that PacifiCorp  will be  required to  maintain  a
transfer  agent  in  each  Place  of Payment  for  such  series.  (Section 4.02)
PacifiCorp may at any time designate additional transfer
 
                                       8
<PAGE>
agents with respect to any series of Junior Subordinated Debentures. The  Junior
Subordinated  Debentures may be transferred or exchanged without service charge,
other than  any tax  or  governmental charge  imposed in  connection  therewith.
(Section 2.05)
 
    In  the event of any redemption in part, PacifiCorp shall not be required to
(i) issue,  register  the  transfer  of  or  exchange  any  Junior  Subordinated
Debenture  during a period beginning  at the opening of  business 15 days before
any selection for redemption of Junior Subordinated Debentures of like tenor and
of the series of which such Junior Subordinated Debenture is a part, and  ending
at  the close of business  on the earliest date in  which the relevant notice of
redemption is deemed to  have been given to  all holders of Junior  Subordinated
Debentures of like tenor and of such series to be redeemed and (ii) register the
transfer  of  or exchange  any Junior  Subordinated  Debentures so  selected for
redemption, in whole  or in part,  except the unredeemed  portion of any  Junior
Subordinated Debenture being redeemed in part. (Section 2.05)
 
PAYMENT AND PAYING AGENTS
 
    Unless   otherwise  indicated  in  the  Prospectus  Supplement,  payment  of
principal of and premium, if any,  on any Junior Subordinated Debenture will  be
made  only against  surrender to  the Paying  Agent of  such Junior Subordinated
Debenture. Unless otherwise indicated in the Prospectus Supplement, principal of
and premium, if  any, and  interest on  Junior Subordinated  Debentures will  be
payable,  subject to any applicable laws and  regulations, at the office of such
Paying Agent or  Paying Agents as  PacifiCorp may designate  from time to  time,
except  that at  the option  of PacifiCorp  payments on  the Junior Subordinated
Debentures may be  made (i) by  checks mailed  by the Debenture  Trustee to  the
holders  entitled  thereto at  their registered  addresses  as specified  in the
Register for  such  Junior  Subordinated  Debentures or  (ii)  to  a  holder  of
$1,000,000  or more  in aggregate principal  amount of  such Junior Subordinated
Debentures who has delivered a written request to the Debenture Trustee at least
14 days prior to  the relevant Interest Payment  Date electing to have  payments
made  by wire  transfer to a  designated account  in the United  States, by wire
transfer of immediately  available funds  to such  designated account;  PROVIDED
that,  in  either case,  the payment  of  principal with  respect to  any Junior
Subordinated  Debenture  will  be  made  only  upon  surrender  of  such  Junior
Subordinated  Debenture to the Debenture  Trustee. Unless otherwise indicated in
the  Prospectus  Supplement,  payment  of  interest  on  a  Junior  Subordinated
Debenture  on any Interest Payment Date will be made to the person in whose name
such  Junior  Subordinated   Debenture  (or   Predecessor  Junior   Subordinated
Debenture)  is registered at the  close of business on  the record date for such
interest payment. (Sections 2.03 and 4.03)
 
    PacifiCorp and the Trustee will act as co-Paying Agents with respect to  the
Junior  Subordinated  Debentures for  so  long as  the  Series C  Debentures are
represented by  a  Global  Debenture.  PacifiCorp  may  at  any  time  designate
additional  Paying Agents  or rescind  the designation  of any  Paying Agents or
approve a change in the office through which any Paying Agent acts, except  that
PacifiCorp  will be required to maintain a Paying Agent in each Place of Payment
for each series of the Junior Subordinated Debentures. (Sections 4.02 and 4.03)
 
    All moneys paid  by PacifiCorp  to a  Paying Agent  for the  payment of  the
principal  of  or  premium,  if  any, or  interest  on  any  Junior Subordinated
Debenture of any series that remain unclaimed at the end of two years after such
principal, premium, if any, or interest  shall have become due and payable  will
be  repaid to  PacifiCorp and the  holder of such  Junior Subordinated Debenture
will thereafter look only to PacifiCorp for payment thereof. (Section 11.06)
 
GLOBAL DEBENTURES
 
    The Junior Subordinated Debentures of a series may be issued in whole or  in
part  in the form of one or  more global securities ("Global Junior Subordinated
Debentures") that will  be deposited with,  or on behalf  of, a depositary  (the
"Depositary")  identified in the Prospectus  Supplement relating to such series.
Global Junior Subordinated  Debentures may  be issued only  in fully  registered
form and in either temporary or permanent form. Unless and until it is exchanged
in   whole  or  in  part  for  the  individual  Junior  Subordinated  Debentures
represented  thereby,  a  Global  Junior  Subordinated  Debenture  may  not   be
transferred  except  as  a  whole  by  the  Depositary  for  such  Global Junior
Subordinated Debenture to a
 
                                       9
<PAGE>
nominee of such Depositary or by a nominee of such Depositary to such Depositary
or another nominee of such Depositary or  by the Depositary or any nominee to  a
successor Depositary or any nominee of such successor.
 
    The specific terms of the depository arrangement with respect to any portion
of  a series  of Junior  Subordinated Debentures to  be represented  by a Global
Junior Subordinated Debenture  will be described  in the Prospectus  Supplement.
PacifiCorp  anticipates that  the following  provisions will  generally apply to
depositary arrangements.
 
    Upon the issuance of a Global Junior Subordinated Debenture, and the deposit
of  such  Global  Junior  Subordinated  Debenture  with  or  on  behalf  of  the
Depositary,  the Depositary for such Global Junior Subordinated Debenture or its
nominee will  credit on  its book-entry  registration and  transfer system,  the
respective  principal amounts  of the individual  Junior Subordinated Debentures
represented by  such Global  Junior Subordinated  Debenture to  the accounts  of
persons  that have accounts with such Depositary ("Participants"). Such accounts
shall be designated by the dealers, underwriters or agents with respect to  such
Junior  Subordinated  Debentures or  by PacifiCorp  if such  Junior Subordinated
Debentures are offered and sold directly by PacifiCorp. Ownership of  beneficial
interests  in  a  Global  Junior  Subordinated  Debenture  will  be  limited  to
Participants or persons that may hold interests through Participants.  Ownership
of  beneficial interests  in such Global  Junior Subordinated  Debenture will be
shown on, and  the transfer  of that ownership  will be  effected only  through,
records  maintained by the applicable Depositary or its nominee (with respect to
interests of  Participants) and  the records  of Participants  (with respect  to
interests of persons who hold through Participants). The laws of some states may
require  that certain  purchasers of securities  take physical  delivery of such
securities in definitive form. Such limits and such laws may impair the  ability
to transfer beneficial interests in a Global Junior Subordinated Debenture.
 
    So long as the Depositary for a Global Junior Subordinated Debenture, or its
nominee,  is the registered owner of  such Global Junior Subordinated Debenture,
such Depositary or such nominee, as the case may be, will be considered the sole
owner or holder of the Junior Subordinated Debentures represented by such Global
Junior Subordinated Debenture  for all  purposes under  the Indenture  governing
such  Junior  Subordinated  Debentures.  Except  as  provided  below,  owners of
beneficial interests  in a  Global  Junior Subordinated  Debenture will  not  be
entitled  to have  any of the  individual Junior Subordinated  Debentures of the
series represented by  such Global Junior  Subordinated Debenture registered  in
their names, will not receive or be entitled to receive physical delivery of any
such  Junior Subordinated Debentures of such  series in definitive form and will
not be considered the owners or holders thereof under the Indenture.
 
    Payments of principal  of and premium,  if any, and  interest on  individual
Junior  Subordinated  Debentures  represented by  a  Global  Junior Subordinated
Debenture registered in the name of a Depositary or its nominee will be made  to
the  Depositary or its nominee,  as the case may be,  as the registered owner of
the Global Junior Subordinated  Debenture representing such Junior  Subordinated
Debentures.  None of PacifiCorp, the Debenture Trustee, any Paying Agent, or the
Registrar for such Junior Subordinated  Debentures will have any  responsibility
or  liability for  any aspect  of the  records relating  to or  payments made on
account of  beneficial ownership  interests of  the Global  Junior  Subordinated
Debentures  representing such Junior Subordinated Debentures or for maintaining,
supervising or  reviewing  any records  relating  to such  beneficial  ownership
interests.
 
    PacifiCorp  expects that the Depositary for  a series of Junior Subordinated
Debentures or its nominee, upon receipt of any payment of principal, premium, if
any, or interest in respect of a permanent Global Junior Subordinated  Debenture
representing any of such Junior Subordinated Debentures, immediately will credit
Participants'   accounts  with  payments  in   amounts  proportionate  to  their
respective beneficial interests in  the principal amount  of such Global  Junior
Subordinated Debenture representing such Junior Subordinated Debentures as shown
on  the records of such Depositary or  its nominee. PacifiCorp also expects that
payments by  Participants  to owners  of  beneficial interests  in  such  Global
 
                                       10
<PAGE>
Junior Subordinated Debenture held through such Participants will be governed by
standing  instructions  and  customary  practices,  as  is  now  the  case  with
securities held for the  accounts of customers in  bearer form or registered  in
"street name." Such payments will be the responsibility of such Participants.
 
    Unless  otherwise specified  in the  applicable Prospectus  Supplement, if a
Depositary for  a  series of  Junior  Subordinated  Debentures is  at  any  time
unwilling,  unable  or  ineligible to  continue  as depositary  and  a successor
depositary is not appointed by PacifiCorp within 90 days, PacifiCorp will  issue
individual  Junior Subordinated  Debentures of such  series in  exchange for the
Global  Junior  Subordinated  Debenture  representing  such  series  of   Junior
Subordinated Debentures. In addition, PacifiCorp may at any time and in its sole
discretion,  subject to any  limitations described in  the Prospectus Supplement
relating to  such Junior  Subordinated  Debentures, determine  not to  have  any
Junior  Subordinated Debentures of such series represented by one or more Global
Junior Subordinated Debentures and, in such event, will issue individual  Junior
Subordinated  Debentures  of  such  series in  exchange  for  the  Global Junior
Subordinated  Debenture  representing   such  series   of  Junior   Subordinated
Debentures.  Further,  if PacifiCorp  so specifies  with  respect to  the Junior
Subordinated Debentures of  a series,  an owner of  a beneficial  interest in  a
Global Junior Subordinated Debenture representing Junior Subordinated Debentures
of such series may, on terms acceptable to PacifiCorp, the Debenture Trustee and
the Depositary for such Global Junior Subordinated Debenture, receive individual
Junior  Subordinated Debentures of  such series in  exchange for such beneficial
interest, subject  to any  limitations described  in the  Prospectus  Supplement
relating  to such Junior Subordinated Debentures. In any such instance, an owner
of a  beneficial interest  in a  Global Junior  Subordinated Debenture  will  be
entitled  to physical delivery  of individual Junior  Subordinated Debentures of
the series represented  by such  Global Junior Subordinated  Debenture equal  in
principal   amount  to  such  beneficial  interest   and  to  have  such  Junior
Subordinated Debentures registered in  its name. Individual Junior  Subordinated
Debentures  of such  series so  issued will  be issued  in denominations, unless
otherwise specified by PacifiCorp, of $25 and integral multiples thereof.
 
REDEMPTION
 
    Unless otherwise indicated in  the applicable Prospectus Supplement,  Junior
Subordinated Debentures will not be subject to any sinking fund.
 
    The  applicable  Prospectus Supplement  will specify  the period  or periods
within which, the price  or prices at  which and the  terms and conditions  upon
which the Junior Subordinated Debentures of any series may be redeemed, in whole
or  in  part, at  the option  of PacifiCorp.  Junior Subordinated  Debentures in
denominations larger  than $25  may be  redeemed in  part but  only in  integral
multiples  of $25.  Except as otherwise  specified in  the applicable Prospectus
Supplement, the  redemption  price  for any  Junior  Subordinated  Debenture  so
redeemed  shall equal any accrued and  unpaid interest thereon to the redemption
date, plus the principal amount thereof.
 
    Except as otherwise specified in the applicable Prospectus Supplement, if  a
Debenture  Tax  Event  (as defined  below)  in  respect of  a  series  of Junior
Subordinated Debentures shall occur  and be continuing,  PacifiCorp may, at  its
option,  redeem such series of Junior  Subordinated Debentures in whole (but not
in part) at  any time within  90 days of  the occurrence of  such Debenture  Tax
Event,  at a  redemption price  equal to  100% of  the principal  amount of such
Junior Subordinated Debentures then outstanding plus accrued and unpaid interest
to the date fixed for redemption.
 
    "Debenture Tax  Event" means  the receipt  by PacifiCorp  of an  opinion  of
counsel,  rendered by a law firm having a recognized national tax and securities
practice, to  the effect  that,  as a  result of  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  as a  result of  any official administrative
pronouncement or  judicial  decision  interpreting  or  applying  such  laws  or
regulations,  which amendment  or change is  effective or  such pronouncement or
decision is announced on or after the date of issuance of the applicable  series
of Junior Subordinated Debentures
 
                                       11
<PAGE>
under  the Indenture,  there is  more than  an insubstantial  risk that interest
payable by PacifiCorp on such series  of Junior Subordinated Debentures is  not,
or  within 90  days of  the date  of such  opinion, will  not be,  deductible by
PacifiCorp, in whole or in part, for United States federal income tax purposes.
 
    Notice of any redemption will be mailed  at least 30 days but not more  than
60  days  before  the redemption  date  to  each Holder  of  Junior Subordinated
Debentures to be redeemed at its registered address. Unless PacifiCorp  defaults
in  payment of the redemption  price, on and after  the redemption date interest
ceases to  accrue on  such Junior  Subordinated Debentures  or portions  thereof
called for redemption.
 
OPTION TO EXTEND INTEREST PAYMENT DATE
 
    If  provided in the applicable  Prospectus Supplement, PacifiCorp shall have
the right at any  time or from  time to time  during the term  of any series  of
Junior  Subordinated Debentures to defer the payment of interest for such number
of consecutive interest payment periods with respect to each deferred period  as
may  be specified in  the applicable Prospectus  Supplement (each, an "Extension
Period"), subject to the terms, conditions  and covenants, if any, specified  in
such  Prospectus Supplement, provided that such  Extension Period may not extend
beyond the maturity of  such series of  Junior Subordinated Debentures.  Certain
United  States  federal  income  tax  consequences  and  special  considerations
applicable to any such Junior Subordinated  Debentures will be described in  the
applicable  Prospectus Supplement. In  the event that  PacifiCorp exercises this
right, certain restrictions will be applicable to PacifiCorp as described  under
"-- Certain Covenants of PacifiCorp."
 
AGREED TAX TREATMENT
 
    The  Indenture provides that each holder of a Junior Subordinated Debenture,
each  person  that  acquires  a  beneficial  ownership  interest  in  a   Junior
Subordinated  Debenture  and PacifiCorp  agree that  for United  States federal,
state and  local tax  purposes  it is  intended  that such  Junior  Subordinated
Debenture constitute indebtedness. (Section 13.12)
 
MODIFICATION OF INDENTURE
 
    The  Indenture contains  provisions permitting PacifiCorp  and the Debenture
Trustee, with  the  consent of  the  holders of  not  less than  a  majority  in
principal  amount of the Junior Subordinated Debentures of each series which are
affected by  the  modification, to  modify  the Indenture  or  any  supplemental
indenture  affecting that series or the rights  of the holders of that series of
Junior Subordinated Debentures; PROVIDED that no such modification may,  without
the  consent of  the holder  of each  outstanding Junior  Subordinated Debenture
affected thereby,  (i) extend  the  fixed maturity  of any  Junior  Subordinated
Debentures  of any series, or reduce the principal amount thereof, or reduce the
rate or extend the time  of payment of interest  thereon, or reduce any  premium
payable  upon the  redemption thereof  or (ii)  reduce the  percentage of Junior
Subordinated Debentures, the  holders of which  are required to  consent to  any
such  supplemental indenture. (Section 9.02) In the case of Corresponding Junior
Subordinated Debentures,  so long  as any  of the  related series  of  Preferred
Securities  remain  outstanding,  PacifiCorp  will  covenant  in  the applicable
Supplemental Indenture  that no  such modification  may be  made that  adversely
affects the holders of such Preferred Securities in any material respect, and no
termination  of the Indenture may occur, and no waiver of any Debenture Event of
Default or compliance with  any covenant under the  Indenture may be  effective,
without the prior consent of the holders of at least a majority of the aggregate
liquidation  preference  of  such  Preferred  Securities  unless  and  until the
principal of the  Corresponding Junior Subordinated  Debentures and all  accrued
and  unpaid interest thereon have been paid in full and certain other conditions
are  satisfied.   See   "Description  of   Corresponding   Junior   Subordinated
Debentures."
 
    In  addition, PacifiCorp and the Debenture  Trustee may execute, without the
consent of any holder  of Junior Subordinated  Debentures (including the  Junior
Subordinated  Debentures being  offered hereby), any  supplemental indenture for
certain other usual purposes, including the creation of any new series of Junior
Subordinated Debentures. (Sections 2.01, 9.01 and 10.01)
 
                                       12
<PAGE>
DEBENTURE EVENTS OF DEFAULT
 
    The Indenture  provides that  any one  or more  of the  following  described
events,  which has occurred and is continuing, constitutes a "Debenture Event of
Default" with respect to each series of Junior Subordinated Debentures:
 
    (a) failure  for  10  days  to  pay  interest  on  the  Junior  Subordinated
Debentures of that series when due; or
 
    (b)  failure  to  pay  principal  of  or  premium,  if  any,  on  the Junior
Subordinated Debentures  of  that series  when  due whether  at  maturity,  upon
redemption,  by declaration  or otherwise, or  to make any  sinking or analogous
fund payment established with respect to that series; or
 
    (c) failure  to observe  or perform  any other  covenant (other  than  those
specifically  relating  to  one  or more  other  series  of  Junior Subordinated
Debentures) contained in the Indenture for 90 days after notice; or
 
    (d) a decree or order by a  court having jurisdiction in the premises  shall
have  been entered adjudging PacifiCorp a bankrupt or insolvent, or approving as
properly filed a  petition seeking liquidation  or reorganization of  PacifiCorp
under  the Federal  Bankruptcy Code or  any other similar  applicable federal or
state law, and such decree or order shall have continued unvacated and  unstayed
for  a period of 90 days; an involuntary case shall be commenced under such Code
in respect of PacifiCorp and shall continue undismissed for a period of 90  days
or  an order for  relief in such  case shall have  been entered; or  a decree or
order of a court having jurisdiction in the premises shall have been entered for
the appointment  on  the ground  of  insolvency  or bankruptcy  of  a  receiver,
custodian,  liquidator,  trustee  or  assignee in  bankruptcy  or  insolvency of
PacifiCorp or of  its property,  or for  the winding  up or  liquidation of  its
affairs,  and such decree  or order shall  have remained in  force unvacated and
unstayed for a period of 90 days; or
 
    (e) PacifiCorp shall  institute proceedings  to be  adjudicated a  voluntary
bankrupt,  shall consent  to the filing  of a bankruptcy  proceeding against it,
shall file a petition or answer or consent seeking liquidation or reorganization
under the Federal Bankruptcy Code or  other similar applicable federal or  state
law,  shall consent to the  filing of any such petition  or shall consent to the
appointment on the ground of insolvency or bankruptcy of a receiver or custodian
or liquidator or trustee or assignee in bankruptcy or insolvency of it or of its
property, or shall  make an assignment  for the benefit  of creditors.  (Section
6.01)
 
    The  holders of a majority in  aggregate outstanding principal amount of any
series of the Junior Subordinated Debentures have the right to direct the  time,
method  and place of conducting  any proceeding for any  remedy available to the
Debenture Trustee for that series. (Section  6.06) The Debenture Trustee or  the
holders  of not less than  25% in aggregate outstanding  principal amount of any
particular  series  of  the  Junior  Subordinated  Debentures  may  declare  the
principal  due and  payable immediately upon  a Debenture Event  of Default with
respect to such  series and, in  the case of  Corresponding Junior  Subordinated
Debentures,  should the Debenture Trustee or  such holders of such Corresponding
Junior Subordinated Debentures fail to make such declaration, the holders of  at
least 25% in aggregate liquidation preference of the related series of Preferred
Securities  shall  have  such right.  The  holders  of a  majority  in aggregate
outstanding principal amount of such series may annul such declaration and waive
such Debenture Event of Default if it has been cured and a sum sufficient to pay
all matured installments  of interest  and principal  and any  premium has  been
deposited  with the Debenture Trustee.  (Sections 6.01 and 6.06)  In the case of
Corresponding  Junior  Subordinated  Debentures,  should  the  holders  of  such
Corresponding  Junior Subordinated Debentures fail to annul such declaration and
waive such Debenture Event  of Default, the holders  of a majority in  aggregate
liquidation  preference of the related series of Preferred Securities shall have
such right.
 
    The holders of a majority in  aggregate outstanding principal amount of  all
series  of the Junior Subordinated Debentures affected thereby may, on behalf of
the holders of all the Junior Subordinated Debentures of such series, waive  any
past   default,  except  a  default  in   the  payment  of  principal,  premium,
 
                                       13
<PAGE>
if any,  or  interest.  (Section  6.06) In  the  case  of  Corresponding  Junior
Subordinated  Debentures,  should  the  holders  of  such  Corresponding  Junior
Subordinated Debentures fail to waive such default, the holders of a majority in
aggregate liquidation preference of the  related series of Preferred  Securities
shall  have  such  right.  PacifiCorp  is required  to  file  annually  with the
Debenture Trustee a certificate as to whether or not PacifiCorp is in compliance
with all the conditions and covenants under the Indenture. (Section 5.03(d))
 
    In case a Debenture Event of Default  shall occur and be continuing as to  a
series  of Corresponding  Junior Subordinated  Debentures, the  Property Trustee
will have  the right  to  declare the  principal of  and  the interest  on  such
Corresponding Junior Subordinated Debentures 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 such Corresponding Junior Subordinated Debentures.
 
    If a Debenture  Event of  Default has occurred  and is  continuing and  such
event  is attributable to the failure of PacifiCorp to pay interest or principal
on the Corresponding Junior Subordinated Debentures on the date such interest or
principal is  otherwise  payable, then  a  holder of  Preferred  Securities  may
institute  a Direct  Action (as  defined below  under "Description  of Preferred
Securities -- Enforcement of Certain Rights by Holders of Preferred Securities")
for payment after the respective due dates specified in the Corresponding Junior
Subordinated Debentures. PacifiCorp may  not amend the  Indenture to remove  the
foregoing  right to bring a  Direct Action without the  prior written consent of
the holders of all of the  Preferred Securities. PacifiCorp 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
PacifiCorp to such holder in any Direct Action.
 
    The  holders  of the  Preferred  Securities would  not  be able  to exercise
directly any  rights  against PacifiCorp  other  than  those set  forth  in  the
preceding  paragraph  available  to  the  holders  of  the  Corresponding Junior
Subordinated Debentures unless  the Property Trustee  or the Debenture  Trustee,
acting  for the benefit of the Property Trustee,  fails to do so for 60 days. In
such event, to the fullest extent permitted by law, the holders of at least  25%
in  aggregate  liquidation preference  of  the outstanding  Preferred Securities
would have the right to directly  institute proceedings for enforcement of  such
rights.  See  "Description of  Preferred  Securities --  Enforcement  of Certain
Rights by Holders of Preferred Securities."
 
CONSOLIDATION, MERGER AND SALE
 
    The Indenture does  not contain  any covenant  which restricts  PacifiCorp's
ability  to merge  or consolidate  with or into  any other  corporation, sell or
convey all or substantially  all of its assets  to any corporation or  otherwise
engage in restructuring transactions. (Section 10.01)
 
CONVERSION OR EXCHANGE
 
    Unless  otherwise  indicated in  the  applicable Prospectus  Supplement, the
Junior Subordinated Debentures of any series may be convertible or  exchangeable
into  Preferred  Securities or  other securities.  The  specific terms  on which
Junior Subordinated Debentures of  any series may be  so converted or  exchanged
will  be  set forth  in  the applicable  Prospectus  Supplement. Such  terms may
include provisions for conversion or  exchange, either mandatory, at the  option
of  the holder,  or at  the option of  PacifiCorp, in  which case  the number of
shares of Preferred Securities or other securities to be received by the holders
of Junior Subordinated Debentures would  be calculated as of  a time and in  the
manner stated in the applicable Prospectus Supplement.
 
DEFEASANCE AND DISCHARGE
 
    Under the terms of the Indenture, PacifiCorp will be discharged from any and
all  obligations  under  the Indenture  in  respect of  the  Junior Subordinated
Debentures of  any  series (except  in  each  case for  certain  obligations  to
register  the transfer  or exchange  of Junior  Subordinated Debentures, replace
stolen, lost  or  mutilated  Junior  Subordinated  Debentures,  maintain  paying
agencies  and hold moneys for payment in  trust) if PacifiCorp deposits with the
Debenture Trustee,  in trust,  moneys or  Government Obligations,  in an  amount
sufficient to pay all the principal of, and interest on, the Junior Subordinated
 
                                       14
<PAGE>
Debentures  of such series on the dates such payments are due in accordance with
the terms of such  Junior Subordinated Debentures and,  if, among other  things,
such  Junior Subordinated Debentures are  not due and payable,  or are not to be
called for redemption,  within one  year, PacifiCorp delivers  to the  Debenture
Trustee  an  Opinion  of  Counsel  to the  effect  that  the  holders  of Junior
Subordinated Debentures of such series will  not recognize income, gain or  loss
for  federal income tax purposes  as a result of  such deposit and discharge and
will be subject to federal income tax on the same amount and in the same  manner
and  at the same times as would have been the case if such deposit and discharge
had not  occurred. In  addition  to discharging  certain obligations  under  the
Indenture  as stated above,  if PacifiCorp delivers to  the Debenture Trustee an
Opinion of Counsel (in lieu of the Opinion of Counsel referred to above) to  the
effect  that (a) PacifiCorp has  received from, or there  has been published by,
the Internal Revenue Service  a ruling or  (b) since the  date of the  Indenture
there  has been a change in applicable federal income tax law, in either case to
the effect that, and based thereon  such Opinion of Counsel shall confirm  that,
the  holders of Junior Subordinated Debentures of such series will not recognize
income, gain  or loss  for  federal income  tax purposes  as  a result  of  such
deposit,  defeasance and discharge and will be  subject to federal income tax on
the same amount and in the same manner and at the same times, as would have been
the case if such deposit, defeasance and discharge had not occurred, and (c) the
trust resulting from the defeasance is a  valid trust and will not constitute  a
regulated  investment  company  under the  Investment  Company Act  of  1940, as
amended, then,  in  such event,  PacifiCorp  will be  deemed  to have  paid  and
discharged the entire indebtedness on the Junior Subordinated Debentures. In the
event  of any such defeasance and discharge of Junior Subordinated Debentures of
such series, holders of Junior Subordinated  Debentures of such series would  be
able  to look only to such trust fund  for payment of principal of (and premium,
if any) and  interest, if  any, on the  Junior Subordinated  Debentures of  such
series. (Sections 11.01, 11.02 and 11.03)
 
GOVERNING LAW
 
    The  Indenture and the  Junior Subordinated Debentures  will be governed by,
and construed in accordance with,  the laws of the  State of New York.  (Section
13.04)
 
INFORMATION CONCERNING THE DEBENTURE TRUSTEE
 
    The  Debenture 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. (Section 7.01) Subject to such provision, the
Debenture 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 reasonable  indemnity  by such  holder  against the
costs, expenses and liabilities which might be incurred thereby. (Section  7.02)
The  Debenture  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 Debenture Trustee reasonably believes  that repayment or adequate  indemnity
is not reasonably assured to it. (Section 7.01)
 
    The  Bank of New York serves as trustee and agent under agreements involving
PacifiCorp and its affiliates.
 
                                       15
<PAGE>
MISCELLANEOUS
 
    PacifiCorp  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  subsidiary
of  PacifiCorp; PROVIDED THAT,  in the event of  any such assignment, PacifiCorp
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. (Section 13.11)
 
                      DESCRIPTION OF PREFERRED SECURITIES
 
    Pursuant  to the  terms of  the Trust Agreement  for each  Issuer Trust, the
Issuer Trustees  on  behalf  of  such Issuer  Trust  will  issue  the  Preferred
Securities  and the Common Securities. The  Preferred Securities of a particular
issue will represent preferred undivided  beneficial interests in the assets  of
the  related  Issuer  Trust  and  the holders  thereof  will  be  entitled  to a
preference in certain  circumstances with respect  to Distributions and  amounts
payable  on redemption or liquidation over  the Common Securities of such Issuer
Trust, as  well  as other  benefits  as  described in  the  corresponding  Trust
Agreement.  This summary of  certain provisions of  the Preferred Securities and
each Trust Agreement does not purport to  be complete and is subject to, and  is
qualified  in its  entirety by  reference to, all  the provisions  of each Trust
Agreement, including the  definitions therein  of certain terms,  and the  Trust
Indenture  Act.  Wherever  particular defined  terms  of a  Trust  Agreement (as
supplemented or  amended from  time to  time) are  referred to  herein or  in  a
Prospectus  Supplement, such defined terms are incorporated herein or therein by
reference. The form of each Trust Agreement has been filed as an exhibit to  the
Registration Statement of which this Prospectus forms a part. Each of the Issuer
Trusts  is a legally separate entity and the  assets of one are not available to
satisfy the obligations of any of the others.
 
GENERAL
 
    The Preferred  Securities of  an  Issuer Trust  will  rank PARI  PASSU,  and
payments  will be  made thereon  PRO RATA,  with the  Common Securities  of that
Issuer Trust  except  as  described  below under  "--  Subordination  of  Common
Securities."  Legal title  to the  Corresponding Junior  Subordinated Debentures
will be held by the Property Trustee in trust for the benefit of the holders  of
the related Preferred Securities and Common Securities. Each Guarantee Agreement
executed  by PacifiCorp  for the  benefit of  the holders  of an  Issuer Trust's
Preferred Securities (each, a "Guarantee") will be a guarantee on a subordinated
basis with respect to  the related Preferred Securities  but will not  guarantee
payment of Distributions or amounts payable on redemption or liquidation of such
Preferred  Securities when the related Issuer Trust  does not have funds on hand
available to make such payments. See "Description of Guarantees."
 
DISTRIBUTIONS
 
    Each Issuer  Trust's  Preferred  Securities  represent  preferred  undivided
beneficial  interests in the assets of  such Issuer Trust, and the Distributions
on each Preferred Security will be payable at a rate specified in the Prospectus
Supplement for such  Preferred Securities. The  amount of Distributions  payable
for  any period will be computed on the basis of a 360-day year of twelve 30-day
months unless  otherwise  specified  in the  applicable  Prospectus  Supplement.
Distributions  to  which  holders  of  Preferred  Securities  are  entitled will
accumulate additional Distributions ("Additional  Amounts") if and as  specified
in the applicable Prospectus Supplement. The term "Distributions" as used herein
includes any Additional Amounts unless otherwise stated.
 
    Distributions   on  the  Preferred  Securities   will  be  cumulative,  will
accumulate from the date of original issuance and will be payable on such  dates
as specified in the applicable Prospectus Supplement. In the event that any date
on which Distributions are payable on the Preferred Securities is not a Business
Day (as defined below), payment of the Distribution payable on such date will be
made on the next succeeding day that 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,  payment of such Distribution shall be
made on the immediately preceding Business Day, in each case with the same force
and effect as if made on such date (each date on which Distributions are payable
in accordance with the
 
                                       16
<PAGE>
foregoing, a "Distribution  Date"). A "Business  Day" shall mean  any day  other
than  a Saturday or a Sunday, or a day on which banking institutions in The City
of New York  are authorized  or required  by law  or executive  order to  remain
closed  or a day on which the corporate  trust office of the Property Trustee or
the Debenture Trustee is closed for business.
 
    If provided  in the  applicable Prospectus  Supplement, PacifiCorp  has  the
right  under the Indenture to defer the payment of interest on any series of the
Corresponding Junior Subordinated Debentures  at any time or  from time to  time
for  one  or  more  Extension  Periods, subject  to  the  terms,  conditions and
covenants, if any, specified in  the applicable Prospectus Supplement,  PROVIDED
that  no  Extension Period  may extend  beyond  the maturity  of such  series of
Corresponding Junior  Subordinated  Debentures. As  a  consequence of  any  such
extension,  Distributions  on the  corresponding  Preferred Securities  would be
deferred (but would continue to  accumulate additional Distributions thereon  at
the  rate per annum  set forth in  the Prospectus Supplement  for such Preferred
Securities) by the  Issuer Trust of  such Preferred Securities  during any  such
Extension  Period. During such Extension Period  PacifiCorp may not, and may not
permit any  subsidiary of  PacifiCorp to,  (i)  declare, set  aside or  pay  any
dividend or distribution on, or repurchase, redeem, or otherwise acquire or make
any  sinking fund  payment with respect  to, any shares  of PacifiCorp's capital
stock or (ii) make any payment of principal, interest or premium, if any, on  or
repay,  repurchase or redeem  any debt securities  that rank PARI  PASSU with or
junior in interest to the  Corresponding Junior Subordinated Debentures or  make
any  guarantee payments with respect to  the foregoing (other than (a) dividends
or distributions in shares of its capital  stock or in rights to acquire  shares
of  its  capital stock,  (b) conversions  into  or exchanges  for shares  of its
capital stock, (c) redemptions, purchases or other acquisitions of shares of its
capital stock made for the purpose of an employee incentive plan or benefit plan
of PacifiCorp or any  of its subsidiaries and  mandatory redemptions or  sinking
fund  payments with respect to any series  of Preferred Stock of PacifiCorp that
are subject to mandatory redemption or sinking fund requirements, PROVIDED  that
the  aggregate stated value  of all such  series outstanding at  the time of any
such payment does  not exceed five  percent of  the aggregate of  (1) the  total
principal   amount  of  all  bonds  or  other  securities  representing  secured
indebtedness issued or assumed  by PacifiCorp and then  outstanding and (2)  the
capital  and  surplus of  PacifiCorp to  be stated  on the  books of  account of
PacifiCorp after  giving effect  to such  payment, PROVIDED,  HOWEVER, that  any
moneys  deposited in any sinking fund and not in violation of this provision may
thereafter be applied to the purchase  or redemption of such Preferred Stock  in
accordance   with  the  terms  of  such  sinking  fund  without  regard  to  the
restrictions contained in this provision,  and (d) payments under any  guarantee
by  PacifiCorp with  respect to  any securities  of a  subsidiary of PacifiCorp,
provided that the proceeds from the  issuance of such securities were issued  to
purchase  Junior Subordinated Debentures of any series under the Indenture). See
"Description of  Junior Subordinated  Debentures --  Option to  Extend  Interest
Payment  Date,"  "--  Certain  Covenants  of  PacifiCorp"  and  "Description  of
Corresponding  Junior   Subordinated   Debentures  --   Certain   Covenants   of
PacifiCorp."
 
    The  revenue of each  Issuer Trust available for  distribution to holders of
its Preferred Securities  will be  limited to payments  under the  Corresponding
Junior  Subordinated  Debentures  in which  such  Issuer Trust  will  invest the
proceeds from the issuance and sale  of its Preferred Securities and its  Common
Securities.  See "Description of  Corresponding Junior Subordinated Debentures."
If PacifiCorp  does not  make  interest payments  on such  Corresponding  Junior
Subordinated  Debentures, the Property Trustee will  not have funds available to
pay  Distributions  on  the  related   Preferred  Securities.  The  payment   of
Distributions (if and to the extent the Issuer Trust has funds available for the
payment  of such  Distributions and  cash sufficient  to make  such payments) is
guaranteed  by  PacifiCorp  on  a  limited  basis  as  set  forth  herein  under
"Description of Guarantees."
 
    Distributions  on  the Preferred  Securities of  each  Issuer Trust  will be
payable to the holders  thereof as they  appear on the  register of such  Issuer
Trust  on the relevant record dates, which,  as long as the Preferred Securities
remain in  book-entry form,  will be  one  Business Day  prior to  the  relevant
Distribution  Date.  Subject  to any  applicable  laws and  regulations  and the
provisions of the applicable Trust Agreement, each such payment will be made  as
described    under    "--    Book-entry   Issuance."    In    the    event   any
 
                                       17
<PAGE>
Preferred Securities are not  in book-entry form, the  relevant record date  for
such Preferred Securities shall be a date at least 15 days prior to the relevant
Distribution Date, as specified in the applicable Prospectus Supplement.
 
REDEMPTION OR EXCHANGE
 
    MANDATORY  REDEMPTION.   Upon the  repayment or  redemption, in  whole or in
part, of any Corresponding Junior  Subordinated Debentures, whether at  maturity
or  upon earlier redemption as provided in the Indenture, the proceeds from such
repayment or redemption  shall be applied  by the Property  Trustee to redeem  a
Like  Amount (as  defined below) of  the related Preferred  Securities, upon not
less than 30 nor more than 60 days' notice prior to the date fixed for repayment
or redemption  (the "Redemption  Date"),  at a  redemption  price equal  to  the
aggregate  liquidation preference of such  Preferred Securities plus accumulated
and unpaid Distributions thereon to the Redemption Date (the "Redemption Price")
and the related  amount of  the premium,  if any,  paid by  PacifiCorp upon  the
concurrent  redemption of such Corresponding Junior Subordinated Debentures. See
"Description  of  Corresponding  Junior  Subordinated  Debentures  --   Optional
Redemption." If less than all of any series of Corresponding Junior Subordinated
Debentures  are to be repaid or redeemed on a Redemption Date, then the proceeds
from such repayment or redemption shall be allocated to the redemption PRO  RATA
of  the related  Preferred Securities and  the Common Securities.  The amount of
premium, if any, paid by  PacifiCorp upon the redemption of  all or any part  of
any  series of any Corresponding Junior  Subordinated Debentures to be repaid or
redeemed on a Redemption Date shall be  allocated to the redemption PRO RATA  of
the related Preferred Securities and the Common Securities.
 
    PacifiCorp  will have the right to redeem any series of Corresponding Junior
Subordinated Debentures  at any  time, in  whole  (but not  in part),  upon  the
occurrence of a Tax Event or an Investment Company Event (each as defined below,
a  "Special  Event")  and  subject to  the  further  conditions  described under
"Description  of  Corresponding  Junior  Subordinated  Debentures  --   Optional
Redemption."  In addition, the applicable Prospectus Supplement will specify the
period or periods within which, the price  or prices at which and the terms  and
conditions  upon which the  Corresponding Junior Subordinated  Debentures of any
series may  be redeemed,  in whole  or in  part, at  the option  of  PacifiCorp.
Corresponding  Junior Subordinated  Debentures in denominations  larger than $25
may be  redeemed in  part  but only  in integral  multiples  of $25.  Except  as
otherwise  specified  in the  applicable  Prospectus Supplement,  the redemption
price for  any Corresponding  Junior Subordinated  Debenture so  redeemed  shall
equal  any accrued and unpaid interest thereon  to the redemption date, plus the
principal amount thereof.
 
    SPECIAL  EVENT   REDEMPTION   OR  DISTRIBUTION   OF   CORRESPONDING   JUNIOR
SUBORDINATED  DEBENTURES. If a Special Event in respect of a series of Preferred
Securities shall occur and be continuing, PacifiCorp has the right to redeem the
Corresponding Junior  Subordinated Debentures  in whole  (but not  in part)  and
thereby  cause a  mandatory redemption of  such Preferred  Securities and Common
Securities in whole (but not in part) within 90 days following the occurrence of
such Special Event at the Redemption Price.  Whether or not a Special Event  has
occurred,  PacifiCorp has the right to terminate the related Issuer Trust at any
time and, after satisfaction of liabilities to creditors of such Issuer Trust as
provided  by  applicable  law,  cause  such  Corresponding  Junior  Subordinated
Debentures  to be  distributed to  the holders  of such  Preferred Securities in
liquidation of the  Issuer Trust.  If PacifiCorp  does not  elect either  option
described  above,  the applicable  series  of Preferred  Securities  will remain
outstanding and,  in the  event a  Tax  Event has  occurred and  is  continuing,
Additional  Sums (as defined  below) may be payable  on the Corresponding Junior
Subordinated Debentures.
 
    "Additional Sums" means the additional amounts as may be necessary in  order
that  the amount of Distributions then due and payable by an Issuer Trust on the
outstanding Preferred Securities and Common Securities of the Issuer Trust shall
not  be  reduced  as  a  result  of  any  additional  taxes,  duties  and  other
governmental  charges to which such Issuer Trust  has become subject as a result
of a Tax Event.
 
                                       18
<PAGE>
    "Investment Company Event" means the receipt by the applicable Issuer  Trust
of  an opinion of counsel,  rendered by a law  firm having a recognized national
tax and securities practice, to the effect  that, as a result of the  occurrence
of a change in law or regulation or a change in interpretation or application of
law  or  regulation  by  any legislative  body,  court,  governmental  agency or
regulatory authority (a "Change in 1940 Act Law") the applicable Issuer Trust is
or will be considered an "investment Company" that is required to be  registered
under  the Investment Company  Act of 1940, as  amended (the "Investment Company
Act"), which Change in 1940  Act Law becomes effective on  or after the date  of
original issuance of the series of Preferred Securities issued by the applicable
Issuer Trust.
 
    "Like  Amount"  means (i)  with respect  to  a redemption  of any  series of
Preferred Securities, Preferred Securities of  such series having a  Liquidation
Amount  (as defined  below) equal  to that  portion of  the principal  amount of
Corresponding Junior Subordinated Debentures to be contemporaneously redeemed in
accordance with the Indenture and the proceeds of which will be used to pay  the
Redemption  Price  of such  Preferred  Securities, and  (ii)  with respect  to a
distribution of Corresponding Junior Subordinated  Debentures to holders of  any
series  of Preferred Securities in connection  with a termination or liquidation
of the related Issuer Trust, Corresponding Junior Subordinated Debentures having
a principal amount equal to the  Liquidation Amount of the Preferred  Securities
of  the holder  to whom  such Corresponding  Junior Subordinated  Debentures are
distributed. "Liquidation Amount" means the  stated amount of $25 per  Preferred
Security and Common Security.
 
    "Tax  Event" means the receipt by the  applicable Issuer Trust of an opinion
of counsel,  rendered  by  a law  firm  having  a recognized  national  tax  and
securities  practice, to the  effect that, as  a result of  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   as  a  result  of  any   official
administrative  pronouncement or judicial decision interpreting or applying such
laws  or  regulations,  which  amendment   or  change  is  effective  or   which
pronouncement  or decision is announced on or  after the date of issuance of the
Preferred Securities under the  related Trust Agreement, there  is more than  an
insubstantial risk that (i) the applicable Issuer Trust is, or will be within 90
days  of the date of  such opinion, subject to  United States federal income tax
with respect  to income  received  or accrued  on  the corresponding  series  of
Corresponding   Junior  Subordinated   Debentures,  (ii)   interest  payable  by
PacifiCorp on such  series of  Corresponding Junior  Subordinated Debentures  is
not,  or within 90 days of the date  of such opinion, will not be, deductible by
PacifiCorp, in whole or in part, for United States federal income tax  purposes,
or  (iii) the applicable Issuer Trust is, or  will be within 90 days of the date
of such opinion, subject to more than a DE MINIMIS amount of other taxes, duties
or other governmental charges.
 
    After the  liquidation  date fixed  for  any distribution  of  Corresponding
Junior  Subordinated Debentures for any series  of Preferred Securities (i) such
series of Preferred Securities will no longer be deemed to be outstanding,  (ii)
The  Depository Trust Company  ("DTC") or its  nominee, as the  record holder of
such  series  of  Preferred  Securities,   will  receive  a  registered   global
certificate  or certificates representing  the Corresponding Junior Subordinated
Debentures to be  delivered upon  such distribution and  (iii) any  certificates
representing  such series of Preferred Securities not held by DTC or its nominee
will be deemed  to represent  the Corresponding  Junior Subordinated  Debentures
having  a principal  amount equal to  the stated liquidation  preference of such
series of Preferred Securities,  and bearing accrued and  unpaid interest in  an
amount equal to the accrued and unpaid Distributions on such series of Preferred
Securities  until such certificates are presented to the Administrative Trustees
or their agent for transfer or reissuance.
 
    There can  be  no  assurance as  to  the  market prices  for  the  Preferred
Securities  or  the Corresponding  Junior  Subordinated Debentures  that  may be
distributed  in  exchange  for  Preferred   Securities  if  a  termination   and
liquidation  of  an  Issuer  Trust were  to  occur.  Accordingly,  the Preferred
Securities  that  an  investor  may   purchase,  or  the  Corresponding   Junior
Subordinated  Debentures  that  the  investor  may  receive  on  termination and
liquidation of an Issuer Trust,  may trade at a discount  to the price that  the
investor paid to purchase the Preferred Securities offered hereby.
 
                                       19
<PAGE>
REDEMPTION PROCEDURES
 
    Preferred  Securities redeemed on each Redemption  Date shall be redeemed at
the Redemption  Price  with the  applicable  proceeds from  the  contemporaneous
redemption  of the Corresponding Junior  Subordinated Debentures. Redemptions of
the Preferred Securities shall be made and the Redemption Price shall be payable
on each Redemption Date  only to the  extent that the  related Issuer Trust  has
funds  on hand available for the payment  of such Redemption Price. See also "--
Subordination of Common Securities."
 
    If an Issuer Trust gives a notice of redemption in respect of its  Preferred
Securities,  then, by 12:00 noon, New York City time, on the Redemption Date, to
the extent funds are  available, the Property  Trustee will deposit  irrevocably
with  DTC, funds sufficient to pay the applicable Redemption Price and will give
DTC irrevocable instructions and  authority to pay the  Redemption Price to  the
holders  of such  Preferred Securities.  See "--  Book-entry Issuance."  If such
Preferred Securities are no longer in book-entry form, such Issuer Trust, to the
extent funds are available, will irrevocably  deposit with the paying agent  for
such  Preferred  Securities funds  sufficient to  pay the  applicable Redemption
Price and will give such paying agent irrevocable instructions and authority  to
pay  the  Redemption  Price  to  the holders  thereof  upon  surrender  of their
certificates  evidencing   such   Preferred  Securities.   Notwithstanding   the
foregoing,  Distributions payable  on or  prior to  the Redemption  Date for any
Preferred Securities called  for redemption shall  be payable to  the holder  of
such  Preferred  Securities  on  the  relevant  record  dates  for  the  related
Distribution Dates. If  notice of  redemption shall  have been  given and  funds
deposited  as required, then  upon the date  of such deposit,  all rights of the
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,  and  such Preferred
Securities will cease to be  outstanding. 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
which is a Business Day (and 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 called for redemption is improperly withheld or refused and not  paid
either  by  the Issuer  Trust  or by  PacifiCorp  pursuant to  the  Guarantee as
described under  "Description of  Guarantees," Distributions  on such  Preferred
Securities  will continue  to accumulate at  the then applicable  rate, from the
Redemption Date originally established  by the Issuer  Trust for such  Preferred
Securities to the date such Redemption Price is actually paid, in which case the
actual  payment  date will  be the  date  fixed for  redemption for  purposes of
calculating the Redemption Price.
 
    Subject to  applicable law  (including,  without limitation,  United  States
federal securities law), PacifiCorp 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.
 
    Payment of  the  Redemption  Price  on  the  Preferred  Securities  and  any
distribution  of  Corresponding  Junior Subordinated  Debentures  to  holders of
Preferred Securities shall be  made to the  applicable recordholders thereof  as
they appear on the register for such Preferred Securities on the relevant record
date,  which shall be one Business Day  prior to the relevant Redemption Date or
liquidation date, as applicable; PROVIDED, HOWEVER,  that in the event that  any
Preferred  Securities are not  in book-entry form, the  relevant record date for
such Preferred Securities  shall be the  fifteenth day prior  to the  Redemption
Date  or  liquidation  date,  as  applicable,  as  specified  in  the applicable
Prospectus Supplement.
 
    If less than all of the Preferred  Securities issued by an Issuer Trust  are
to  be redeemed on a  Redemption Date, then the  aggregate Liquidation Amount of
such Preferred Securities to be redeemed  shall be allocated PRO RATA among  the
Preferred  Securities. The particular Preferred  Securities to be redeemed shall
be selected on a PRO  RATA basis not more than  60 days prior to the  Redemption
Date  by  the Property  Trustee from  the  outstanding Preferred  Securities not
previously called for redemption, by such  method as the Property Trustee  shall
deem fair and appropriate and which may provide for the selection for redemption
of  portions (equal to $25 or an integral  multiple of $25 in excess thereof) of
the
 
                                       20
<PAGE>
liquidation preference of  Preferred Securities  of a  denomination larger  than
$25.  The Property Trustee shall promptly  notify the trust registrar in writing
of the Preferred  Securities selected  for redemption and,  in the  case of  any
Preferred Securities selected for partial redemption, the liquidation preference
thereof  to be redeemed.  For all purposes  of each Trust  Agreement, unless the
context otherwise  requires,  all  provisions  relating  to  the  redemption  of
Preferred  Securities  shall relate,  in the  case  of any  Preferred Securities
redeemed or  to be  redeemed  only in  part, to  the  portion of  the  aggregate
liquidation  preference  of Preferred  Securities  which has  been  or is  to be
redeemed.
 
    Notice of any redemption will be mailed  at least 30 days but not more  than
60  days before the Redemption Date to each holder of Preferred Securities to be
redeemed at its registered address.
 
SUBORDINATION OF COMMON SECURITIES
 
    Payment of Distributions (including Additional Sums, if applicable) on,  and
the  Redemption Price  of, each Issuer  Trust's Preferred  Securities and Common
Securities, as  applicable, shall  be made  PRO RATA  based on  the  Liquidation
Amount  of such Preferred  Securities and Common  Securities; PROVIDED, HOWEVER,
that if on any Distribution Date or Redemption Date a Debenture Event of Default
shall have occurred and be continuing, no payment of any Distribution (including
Additional Sums, if applicable)  on, or Redemption Price  of, any of the  Issuer
Trust's  Common Securities, and  no other payment on  account of the redemption,
liquidation or other acquisition of such Common Securities, shall be made unless
payment in full in cash of  all accumulated and unpaid Distributions  (including
Additional  Sums,  if  applicable)  on all  of  the  Issuer  Trust's outstanding
Preferred Securities  for  all  Distribution periods  terminating  on  or  prior
thereto,  or in the case  of payment of the Redemption  Price the full amount of
such Redemption  Price  on  all  of the  Issuer  Trust's  outstanding  Preferred
Securities then called for redemption, shall have been made or provided for, and
all  funds  available to  the Property  Trustee  shall first  be applied  to the
payment in full  in cash  of all  Distributions (including  Additional Sums,  if
applicable)  on, or Redemption Price of, the Issuer Trust's Preferred Securities
then due and payable.
 
    In the case  of any Event  of Default  resulting from a  Debenture Event  of
Default,  PacifiCorp as holder of each  Issuer Trust's Common Securities will be
deemed to have waived any right to act with respect to any such Event of Default
under the applicable  Trust Agreement  until the effect  of all  such Events  of
Default  with respect  to such Preferred  Securities have been  cured, waived or
otherwise eliminated.  Until any  such Events  of Default  under the  applicable
Trust  Agreement with  respect to the  Preferred Securities have  been so cured,
waived or otherwise eliminated, the Property Trustee shall act solely on  behalf
of  the holders of such Preferred Securities  and not on behalf of PacifiCorp as
holder of  the  Common  Securities,  and only  the  holders  of  such  Preferred
Securities  will have the right  to direct the Property  Trustee to act on their
behalf.
 
LIQUIDATION DISTRIBUTION UPON TERMINATION
 
    Pursuant to  each Trust  Agreement, each  Issuer Trust  shall  automatically
terminate  upon expiration of its term and shall terminate on the first to occur
of: (i) certain events of bankruptcy, dissolution or liquidation of  PacifiCorp;
(ii)  the distribution of a Like Amount of the Corresponding Junior Subordinated
Debentures to  the  holders  of  its  Preferred  Securities  if  PacifiCorp,  as
Depositor, has given written direction to the Property Trustee to terminate such
Issuer  Trust (which direction  is optional and wholly  within the discretion of
PacifiCorp as Depositor);  (iii) the redemption  of all of  such Issuer  Trust's
Preferred  Securities as described  under "-- Redemption  or Exchange"; and (iv)
the entry by a court of competent  jurisdiction of an order for the  dissolution
of such Issuer Trust.
 
    If  an early  termination occurs  as described in  clause (i),  (ii) or (iv)
above, such  Issuer  Trust  shall  be  liquidated  by  the  Issuer  Trustees  as
expeditiously  as the Issuer Trustees determine  to be possible by distributing,
after satisfaction of liabilities to creditors of such Issuer Trust as  provided
by  applicable  law, to  the  holders of  such  Preferred Securities  and Common
Securities a Like  Amount of the  Corresponding Junior Subordinated  Debentures,
unless  such  distribution  is determined  by  the  Property Trustee  not  to be
practical, in which event such  holders will be entitled  to receive out of  the
assets  of  the  Issuer  Trust  available  for  distribution  to  holders, after
satisfaction of liabilities  to creditors of  such Issuer Trust  as provided  by
applicable  law,  an  amount equal  to,  in  the case  of  holders  of Preferred
Securities, the
 
                                       21
<PAGE>
aggregate of the  liquidation preference plus  accrued and unpaid  Distributions
thereon   to  the   date  of  payment   (such  amount   being  the  "Liquidation
Distribution"). If  such  Liquidation Distribution  can  be paid  only  in  part
because  such Issuer Trust has insufficient assets  available to pay in full the
aggregate Liquidation Distribution,  then the amounts  payable directly by  such
Issuer  Trust on its Preferred Securities shall be paid on a PRO RATA basis. The
holders of such  Issuer Trust's Common  Securities will be  entitled to  receive
distributions  upon  any  such liquidation  PRO  RATA  with the  holders  of its
Preferred Securities, except that if a  Debenture Event of Default has  occurred
and  is continuing,  such Preferred Securities  shall have a  priority over such
Common Securities.  A  supplemental  indenture  may provide  that  if  an  early
termination  occurs as described in clause  (iv) above, the Corresponding Junior
Subordinated Debentures may be subject to optional redemption in whole (but  not
in part).
 
EVENTS OF DEFAULT; NOTICE
 
    Any one of the following events constitutes an "Event of Default" under each
Trust Agreement (an "Event of Default") with respect to the Preferred Securities
issued  thereunder (whatever the reason for such Event of Default and whether it
shall be voluntary or involuntary or be effected by operation of law or pursuant
to any judgment, decree or order of  any court or any order, rule or  regulation
of any administrative or governmental body):
 
         (i)  the occurrence of a Debenture Event of Default under the Indenture
    with respect  to  the  Corresponding  Junior  Subordinated  Debentures  (see
    "Description  of  Junior  Subordinated  Debentures  --  Debenture  Events of
    Default"); or
 
        (ii) default  by the  Trust  in the  payment  of any  Distribution  with
    respect  to  Preferred Securities  of  that issue  when  it becomes  due and
    payable, and continuation of such default for a period of 30 days; or
 
        (iii) default by the Trust in the payment of any Redemption Price of any
    Preferred Security or Common Security of that issue when it becomes due  and
    payable; or
 
        (iv)  default in the performance, or breach, in any material respect, of
    any covenant or  warranty of  the Issuer  Trustees in  such Trust  Agreement
    (other  than a covenant or warranty a default in the performance of which or
    the breach  of which  is dealt  with in  clause (ii)  or (iii)  above),  and
    continuation  of such default or breach for  a period of 60 days after there
    has been given, by  registered or certified mail,  to the defaulting  Issuer
    Trustee  or Trustees by the holders of at least 25% in aggregate liquidation
    preference of the outstanding Preferred Securities of that issue, a  written
    notice specifying such default or breach and requiring it to be remedied and
    stating  that  such  notice  is  a  "Notice  of  Default"  under  such Trust
    Agreement; or
 
        (v) the occurrence of  certain events of  bankruptcy or insolvency  with
    respect  to the Property Trustee and the  failure by PacifiCorp to appoint a
    successor Property Trustee within 60 days thereof.
 
    Within 15  Business  Days after  the  occurrence  of any  Event  of  Default
actually  known to  the Property  Trustee, the  Property Trustee  shall transmit
notice of such Event of Default to the holders of such Issuer Trust's  Preferred
Securities,  the Administrative  Trustees and  PacifiCorp, as  Depositor, unless
such Event of Default shall have been cured or waived. PacifiCorp, as Depositor,
and the Administrative Trustees are required to file annually with the  Property
Trustee  a certificate as to whether or not  they are in compliance with all the
conditions and covenants applicable to them under each Trust Agreement.
 
    If, in the  event of  a Debenture Event  of Default,  the Debenture  Trustee
fails  or the holders of not less than  25% in aggregate principal amount of the
Corresponding Junior Subordinated Debentures fail  to declare the principal  due
and  payable, the holders of at least 25% in aggregate liquidation preference of
the related series of Preferred Securities shall have such right. Except as  set
forth  above, the existence of an Event  of Default does not entitle the holders
of Preferred Securities to  accelerate the maturity  thereof or declare  amounts
due and payable.
 
                                       22
<PAGE>
    If  a Debenture  Event of Default  with respect to  any Corresponding Junior
Subordinated Debentures  has  occurred  and  is  continuing,  the  corresponding
Preferred  Securities shall have a preference over the related Common Securities
upon termination of  the applicable  Issuer Trust  as described  above. See  "--
Liquidation Distribution Upon Termination."
 
ENFORCEMENT OF CERTAIN RIGHTS BY HOLDERS OF PREFERRED SECURITIES
 
    If  a Debenture Event  of Default has  occurred and is  continuing, then the
holders of Preferred Securities  would rely on the  enforcement by the  Property
Trustee  or  the  Debenture Trustee,  acting  for  the benefit  of  the Property
Trustee, of its  rights as  a holder  of the  Corresponding Junior  Subordinated
Debentures  against PacifiCorp.  Notwithstanding the  foregoing, if  a Debenture
Event of Default has occurred and  is continuing and such event is  attributable
to  the failure of PacifiCorp to pay  interest or principal on the Corresponding
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 against
PacifiCorp for enforcement  of payment  to such holder  of the  principal of  or
interest  on the Corresponding Junior Subordinated Debentures having a principal
amount equal to the aggregate liquidation preference of the Preferred Securities
of such holder (a "Direct Action")  after the respective due dates specified  in
the Corresponding Junior Subordinated Debentures. In connection with such Direct
Action,  PacifiCorp 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 payment made by  PacifiCorp to such holder  of Preferred Securities in  such
Direct Action.
 
    The  holders  of the  Preferred  Securities would  not  be able  to exercise
directly against  PacifiCorp  any rights  other  than  those set  forth  in  the
preceding  paragraph  available  to  the  holders  of  the  Corresponding Junior
Subordinated Debentures unless  the Property Trustee  or the Debenture  Trustee,
acting  for the benefit of the Property Trustee,  fails to do so for 60 days. In
such event, to the fullest extent permitted by law, the holders of at least  25%
in  aggregate  liquidation preference  of  the outstanding  Preferred Securities
would have the right to directly  institute proceedings for enforcement of  such
rights.
 
REMOVAL OF ISSUER TRUSTEES
 
    Unless a Debenture Event of Default with respect to any Corresponding Junior
Subordinated  Debentures shall have  occurred and be  continuing, the applicable
Issuer Trustee may be removed  at any time by the  holder of the related  Common
Securities. If such a Debenture Event of Default has occurred and is continuing,
the Property Trustee and the Delaware Trustee may be removed at such time by the
holders  of a  majority in Liquidation  Amount of  the outstanding corresponding
Preferred Securities. In no event will  the holders of the Preferred  Securities
have  the  right  to  vote  to appoint,  remove  or  replace  the Administrative
Trustees, which voting rights are vested exclusively in PacifiCorp as the holder
of the Common Securities. No resignation or removal of an Issuer Trustee and  no
appointment  of a successor  trustee shall be effective  until the acceptance of
appointment by the successor  trustee in accordance with  the provisions of  the
applicable Trust Agreement.
 
CO-TRUSTEES AND SEPARATE PROPERTY TRUSTEE
 
    Unless  an Event of  Default shall have  occurred and be  continuing, at any
time or times, for the  purpose of meeting the  legal requirements of the  Trust
Indenture  Act or of any jurisdiction in  which any part of the applicable Trust
Property may at the  time be located,  PacifiCorp, as the  holder of the  Common
Securities,  shall have power to appoint one or  more persons either to act as a
co-trustee, jointly with the Property Trustee, of all or any part of such  Trust
Property,  or to act  as separate trustee  of any such  property, in either case
with such powers as  may be provided  in the instrument  of appointment, and  to
vest  in such person or  persons in such capacity  any property, title, right or
power deemed necessary or desirable, subject to the provisions of the applicable
Trust Agreement.  In case  a Debenture  Event  of Default  has occurred  and  is
continuing,   the  Property  Trustee  alone  shall   have  power  to  make  such
appointment.
 
                                       23
<PAGE>
MERGER OR CONSOLIDATION OF ISSUER TRUSTEES
 
    Any entity into  which the  Property Trustee,  the Delaware  Trustee or  any
Administrative  Trustee that is not a natural  person may be merged or converted
or with which it may be consolidated,  or any entity resulting from any  merger,
conversion  or consolidation  to which  such Trustee  shall be  a party,  or any
entity succeeding to all  or substantially all the  corporate trust business  of
such Trustee, shall be the successor of such Trustee under each Trust Agreement,
provided such entity shall be otherwise qualified and eligible.
 
MERGERS, CONSOLIDATIONS, AMALGAMATIONS OR REPLACEMENTS OF THE ISSUER TRUSTS
 
    An  Issuer Trust may not merge with  or into, consolidate, amalgamate, or be
replaced  by,  or  convey,   transfer  or  lease   its  properties  and   assets
substantially  as  an entirety  to any  corporation or  other Person,  except as
described below. An  Issuer Trust may,  at the request  of PacifiCorp, with  the
consent of the Administrative Trustees and without the consent of the holders of
the  Preferred Securities of such Issuer Trust, merge with or into, consolidate,
amalgamate, be  replaced by  or convey,  transfer or  lease its  properties  and
assets  substantially as an entirety to a trust organized as such under the laws
of any  State; provided  that (i)  such successor  entity either  (a)  expressly
assumes  all  of the  obligations  of such  Issuer  Trust with  respect  to such
Preferred Securities  or (b)  substitutes for  such Preferred  Securities  other
securities having substantially the same terms as such Preferred Securities (the
"Successor  Securities") so  long as the  Successor Securities rank  the same as
such Preferred Securities  rank in  priority with respect  to distributions  and
payments  upon liquidation, redemption and  otherwise, (ii) PacifiCorp expressly
appoints a trustee of  such successor entity  possessing substantially the  same
powers  and duties as  the Property Trustee  as the holder  of the Corresponding
Junior Subordinated Debentures,  (iii) the  Successor Securities  are listed  or
traded,  or any Successor Securities will  be listed or traded upon notification
of issuance, on any national securities exchange or other organization on  which
such   Preferred  Securities  are  then  listed,   if  any,  (iv)  such  merger,
consolidation, amalgamation, replacement, conveyance, transfer or lease does not
cause such  Preferred  Securities (including  any  Successor Securities)  to  be
downgraded  by any  nationally recognized  statistical rating  organization, (v)
such merger, consolidation, amalgamation,  replacement, conveyance, transfer  or
lease  does not adversely  affect the rights, preferences  and privileges of the
holders of such Preferred Securities (including any Successor Securities) in any
material respect,  (vi)  such  successor  entity  has  a  purpose  substantially
identical   to  that  of  such  Issuer   Trust,  (vii)  prior  to  such  merger,
consolidation,  amalgamation,  replacement,   conveyance,  transfer  or   lease,
PacifiCorp has received an opinion from independent counsel to such Issuer Trust
experienced  in such matters to the  effect that (a) such merger, consolidation,
amalgamation, replacement,  conveyance, transfer  or  lease does  not  adversely
affect  the rights, preferences and privileges  of the holders of such Preferred
Securities (including any Successor Securities) in any material respect, and (b)
following such  merger,  consolidation, amalgamation,  replacement,  conveyance,
transfer  or lease, neither such Issuer Trust  nor such successor entity will be
required to register as an "investment Company" under the Investment Company Act
and (viii) PacifiCorp  or any permitted  successor or assignee  owns all of  the
common  securities of  such successor entity  and guarantees  the obligations of
such successor entity  under the  Successor Securities  at least  to the  extent
provided  by the applicable Guarantee.  Notwithstanding the foregoing, an Issuer
Trust shall  not,  except with  the  consent of  holders  of 100%  in  aggregate
liquidation  preference  of  the  Preferred  Securities  of  such  Issuer Trust,
consolidate, amalgamate, merge with or into, be replaced by or convey,  transfer
or  lease its properties  and assets substantially  as an entirety  to any other
entity or permit  any other  entity to  consolidate, amalgamate,  merge with  or
into,  or replace it  if such consolidation,  amalgamation, merger, replacement,
conveyance, transfer or  lease would cause  such Issuer Trust  or the  successor
entity  to be classified as other than a grantor trust for United States federal
income tax purposes.
 
VOTING RIGHTS; AMENDMENT OF TRUST AGREEMENT
 
    Except as provided below and under "Description of Guarantees --  Amendments
and  Assignment"  and as  otherwise  required by  law  and the  applicable Trust
Agreement, the holders of the Preferred Securities will have no voting rights.
 
                                       24
<PAGE>
    Each Trust Agreement may be amended from time to time by PacifiCorp and  the
Issuer  Trustees, without  the consent of  the holders of  the related Preferred
Securities, (i) to reflect the acceptance  of appointment by a successor  Issuer
Trustee,  (ii) to  cure any ambiguity,  correct or supplement  any provisions in
such Trust Agreement that  may be inconsistent with  any other provision, or  to
make  any other  provisions with respect  to matters or  questions arising under
such Trust Agreement, that shall not  be inconsistent with the other  provisions
of  such Trust Agreement, or (iii) to modify, eliminate or add to any provisions
of such Trust Agreement to such extent as shall be necessary to ensure that  the
related  Issuer Trust  will be classified  for United States  federal income tax
purposes as  a grantor  trust at  all times  that any  Preferred Securities  and
Common  Securities of such Issuer  Trust are outstanding or  to ensure that such
Issuer Trust will not be required  to register as an "investment Company"  under
the  Investment Company Act, PROVIDED, HOWEVER, that  in the case of clause (ii)
above, such  action shall  not  adversely affect  in  any material  respect  the
interests  of any  holder of Preferred  Securities or Common  Securities of such
Issuer Trust, and any amendments of such Trust Agreement shall become  effective
when  notice thereof is  given to the  holders of such  Preferred Securities and
Common Securities. Such Trust  Agreement may be amended  by the Issuer  Trustees
and  PacifiCorp with  (i) the  consent of holders  representing not  less than a
majority  (based  upon  Liquidation  Amounts)  of  such  outstanding   Preferred
Securities  and Common Securities and (ii) receipt  by the Issuer Trustees of an
opinion of counsel  to the effect  that such  amendment or the  exercise of  any
power  granted to the Issuer Trustees in accordance with such amendment will not
affect such Issuer Trust's status as  a grantor trust for United States  federal
income  tax  purposes  or  such  Issuer  Trust's  exemption  from  status  of an
"investment Company" under  the Investment Company  Act, PROVIDED, FURTHER  that
without  the  consent of  each holder  of such  Preferred Securities  and Common
Securities, such Trust Agreement may not be amended to (i) change the amount  or
timing of any Distribution on such Preferred Securities and Common Securities or
otherwise adversely affect the amount of any Distribution required to be made in
respect  of such  Preferred Securities and  Common Securities as  of a specified
date or (ii)  restrict the  right of holders  of such  Preferred Securities  and
Common  Securities to institute suit for the  enforcement of any such payment on
or after such date as described under "-- Events of Default; Notice" above.
 
    So long as any Corresponding Junior Subordinated Debentures are held by  the
Property  Trustee, the Issuer Trustees shall not (i) direct the time, method and
place of conducting  any proceeding for  any remedy available  to the  Debenture
Trustee  or executing any trust or power  conferred on the Property Trustee with
respect to such  Corresponding Junior  Subordinated Debentures,  (ii) waive  any
past  default that is waivable under the  Indenture, (iii) exercise any right to
rescind or  annul a  declaration that  the principal  of all  the  Corresponding
Junior  Subordinated Debentures shall be due and  payable or (iv) consent to any
amendment, modification or  termination of the  Indenture or such  Corresponding
Junior  Subordinated Debentures, where such  consent shall be required, without,
in each case,  obtaining the  prior approval  of the  holders of  a majority  in
aggregate  liquidation  preference  of all  outstanding  corresponding Preferred
Securities; PROVIDED, HOWEVER, that  where a consent  under the Indenture  would
require  the  consent  of  each  holder  of  Corresponding  Junior  Subordinated
Debentures affected thereby,  no such  consent shall  be given  by the  Property
Trustee  without the prior consent of each holder of the corresponding Preferred
Securities.  The  Issuer  Trustees  shall  not  revoke  any  action   previously
authorized  or approved  by a  vote of the  holders of  the Preferred Securities
except by  subsequent vote  of  the holders  of  the Preferred  Securities.  The
Property  Trustee shall notify each holder of record of the Preferred Securities
of any notice of default with  respect to the Corresponding Junior  Subordinated
Debentures.  In addition to obtaining the  foregoing approvals of the holders of
the Preferred Securities,  prior to  taking any  of the  foregoing actions,  the
Issuer  Trustees shall obtain an opinion  of counsel experienced in such matters
to the effect  that the  applicable Issuer  Trust will  not be  classified as  a
corporation  for United  States federal income  tax purposes on  account of such
action.
 
    Any required approval of holders of  Preferred Securities may be given at  a
meeting of holders of Preferred Securities convened for such purpose or pursuant
to written consent. The Property Trustee will
 
                                       25
<PAGE>
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  given to  each holder  of record  of Preferred
Securities in the manner set forth in the applicable Trust Agreement.
 
    No vote or consent of the  holders of Preferred Securities will be  required
for  an Issuer Trust to redeem and cancel its Preferred Securities in accordance
with the applicable Trust Agreement.
 
    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 by PacifiCorp, the Issuer Trustees or any affiliate of
PacifiCorp  or any Issuer Trustees shall, for  purposes of such vote or consent,
be treated as if they were not outstanding.
 
PAYMENT AND PAYING AGENCY
 
    Payments in respect of the Preferred Securities shall be made to DTC,  which
shall  credit the relevant accounts at  DTC on the applicable Distribution Dates
or, if  any  Issuer Trust's  Preferred  Securities are  not  held by  DTC,  such
payments  shall be made  by check mailed  to the address  of the holder entitled
thereto as such address shall appear on the Register. Unless otherwise specified
in the applicable Prospectus Supplement,  the paying agent (the "Paying  Agent")
shall  initially be the Property  Trustee and any co-paying  agent chosen by the
Property Trustee and acceptable to  the Administrative Trustees and  PacifiCorp.
The  Paying Agent  shall be permitted  to resign  as Paying Agent  upon 30 days'
written notice to  the Property Trustee  and PacifiCorp. In  the event that  the
Property  Trustee  shall  no  longer be  the  Paying  Agent,  the Administrative
Trustees shall  appoint a  successor (which  shall be  a bank  or trust  Company
acceptable to the Property Trustee and PacifiCorp) to act as Paying Agent.
 
BOOK-ENTRY ISSUANCE
 
    DTC  will act as securities depositary  for all of 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 certificates will be issued for the Preferred Securities
of each Issuer  Trust, representing in  the aggregate the  total number of  such
Issuer Trust's Preferred Securities, 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. Direct  Participants
include  securities  brokers  and  dealers,  banks,  trust  companies,  clearing
corporations and  certain other  organizations ("Direct  Participants"). DTC  is
owned by a number of its Direct Participants and by the New York Stock Exchange,
Inc.,  the  American  Stock  Exchange,  Inc.  and  the  National  Association of
Securities Dealers, Inc. Access  to the DTC system  is also available to  others
such  as securities  brokers and dealers,  banks and trust  companies that clear
through or  maintain custodial  relationships with  Direct Participants,  either
directly  or indirectly ("Indirect  Participants"). The rules  applicable to DTC
and its Participants are on file with the Commission.
 
    Purchases of Preferred Securities within the  DTC system must be made by  or
through  Direct  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
Direct and Indirect  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 Direct or  Indirect
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
 
                                       26
<PAGE>
the books  of Participants  acting on  behalf of  Beneficial Owners.  Beneficial
Owners  will not receive certificates  representing their ownership interests in
Preferred Securities, except in the event that use of the book-entry system  for
the Preferred Securities of such Issuer Trust is discontinued.
 
    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 will remain responsible for  keeping
account of their holdings on behalf of their customers.
 
    Redemption  notices shall be sent to Cede  & Co. as the registered holder of
the Preferred  Securities. If  less  than all  of  an Issuer  Trust's  Preferred
Securities are being redeemed, DTC's current practice is to determine by lot the
amount of the interest of each Direct Participant to be redeemed.
 
    Although  voting with respect to the  Preferred Securities is limited to the
holders of record  of the Preferred  Securities, in those  instances in which  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 (the "Omnibus Proxy") to the Property Trustee as soon as possible
after the record  date. The  Omnibus Proxy assigns  Cede &  Co.'s consenting  or
voting  rights to  those Direct  Participants to  whose accounts  such Preferred
Securities are credited on the record date (identified in a listing attached  to
the Omnibus Proxy).
 
    Conveyance   of  notices   and  other   communications  by   DTC  to  Direct
Participants, by Direct  Participants to  Indirect Participants,  and by  Direct
Participants  and  Indirect Participants  to  Beneficial Owners  and  the voting
rights of Direct Participants, Indirect Participants and 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.
 
    Distribution payments  on  the Preferred  Securities  will be  made  by  the
Property  Trustee  to  DTC. DTC's  practice  is to  credit  Direct 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  to
Beneficial  Owners  will  be  governed by  standing  instructions  and customary
practices and will be the responsibility of such Participant and not of DTC, the
Property Trustee,  the  Issuer  Trust  thereof or  PacifiCorp,  subject  to  any
statutory  or regulatory  requirements as  may be in  effect from  time to time.
Payment of Distributions to DTC is  the responsibility of the Property  Trustee,
disbursement  of such payments  to Direct Participants  is the responsibility of
DTC, and  disbursements  of  such  payments to  the  Beneficial  Owners  is  the
responsibility of Direct and Indirect Participants.
 
    DTC  may discontinue  providing its  services as  securities depositary with
respect to any  of the  Preferred Securities at  any time  by giving  reasonable
notice  to the Property  Trustee and PacifiCorp.  In the event  that a successor
securities  depositary   is   not  obtained,   definitive   Preferred   Security
certificates  representing such Preferred Securities  are required to be printed
and delivered. PacifiCorp, at its option,  may decide to discontinue use of  the
system  of book-entry transfers through DTC (or a successor depositary). After a
Debenture Event of Default, the holders of a majority in liquidation  preference
of  Preferred Securities may  determine to discontinue  the system of book-entry
transfers through  DTC. In  any  such event,  definitive certificates  for  such
Issuer Trust's Preferred Securities will be printed and delivered.
 
    The  information in this section concerning  DTC and DTC's book-entry system
has been obtained from sources that the Issuer Trusts and PacifiCorp believe  to
be  accurate, but the Issuer Trusts  and PacifiCorp assume no responsibility for
the  accuracy  thereof.  Neither  the  Issuer  Trusts  nor  PacifiCorp  has  any
responsibility  for  the  performance  by  DTC  or  its  Participants  of  their
respective obligations as  described herein  or under the  rules and  procedures
governing their respective operations.
 
REGISTRAR AND TRANSFER AGENT
 
    Unless  otherwise  specified in  the  applicable Prospectus  Supplement, the
Property Trustee will  act as  registrar and  transfer agent  for the  Preferred
Securities.
 
                                       27
<PAGE>
    Registration  of transfers of Preferred  Securities will be effected without
charge by or  on behalf of  each Issuer Trust,  but upon payment  of any tax  or
other  governmental charges that may be  imposed in connection with any transfer
or exchange. The Issuer Trusts will not  be required to register or cause to  be
registered  the  transfer of  their  Preferred Securities  after  such Preferred
Securities have been called for redemption.
 
INFORMATION CONCERNING THE PROPERTY TRUSTEE
 
    The Property Trustee, other than during the occurrence and continuance of an
Event of Default, undertakes to perform only such duties as are specifically set
forth in each Trust  Agreement and, after such  Event of Default, must  exercise
the  same degree of care and skill as  a prudent person would exercise or use in
the conduct of his or her own  affairs. Subject to this provision, the  Property
Trustee is under no obligation to exercise any of the powers vested in it by the
applicable  Trust Agreement at the request of any holder of Preferred Securities
unless it  is  offered reasonable  indemnity  against the  costs,  expenses  and
liabilities  that might be incurred thereby. If no Event of Default has occurred
and is  continuing  and the  Property  Trustee  is required  to  decide  between
alternative  causes of action,  construe ambiguous provisions  in the applicable
Trust Agreement  or  is  unsure of  the  application  of any  provision  of  the
applicable  Trust  Agreement, and  the matter  is  not one  on which  holders of
Preferred Securities are entitled under such  Trust Agreement to vote, then  the
Property  Trustee shall take such action as is directed by PacifiCorp and if not
so directed,  shall take  such action  as it  deems advisable  and in  the  best
interests  of the holders of the  Preferred Securities and the Common Securities
and will have no liability except for  its own bad faith, negligence or  willful
misconduct.
 
MISCELLANEOUS
 
    The  Administrative  Trustees are  authorized  and directed  to  conduct the
affairs of and to operate the Issuer Trusts  in such a way that no Issuer  Trust
will be deemed to be an "investment Company" required to be registered under the
Investment  Company Act or classified as an association taxable as a corporation
for United States  federal income  tax purposes  and so  that the  Corresponding
Junior Subordinated Debentures will be treated as indebtedness of PacifiCorp for
United  States federal income  tax purposes. In  this connection, PacifiCorp and
the Administrative Trustees are authorized to take any action, not  inconsistent
with applicable law, the certificate of trust of each Issuer Trust or each Trust
Agreement,  that PacifiCorp and  the Administrative Trustees  determine in their
discretion to  be necessary  or desirable  for such  purposes, as  long as  such
action  does not materially adversely affect the interests of the holders of the
related Preferred Securities.
 
    Holders of the Preferred Securities have no preemptive or similar rights.
 
    No Issuer Trust may borrow money or issue debt or mortgage or pledge any  of
its assets.
 
                           DESCRIPTION OF GUARANTEES
 
    Each  Guarantee will  be executed  and delivered  by PacifiCorp concurrently
with the  issuance by  each Issuer  Trust of  its Preferred  Securities for  the
benefit  of the holders from time to time of such Preferred Securities. The Bank
of New  York will  act as  indenture trustee  ("Guarantee Trustee")  under  each
Guarantee  for the purposes of compliance with  the Trust Indenture Act and each
Guarantee will be qualified as an indenture under the Trust Indenture Act.  This
summary  of certain provisions of the Guarantees does not purport to be complete
and is subject to,  and qualified in  its entirety by reference  to, all of  the
provisions  of  each Guarantee,  including  the definitions  therein  of certain
terms, and the Trust Indenture Act. The form of each Guarantee has been filed as
an exhibit to the Registration Statement of which this Prospectus forms a  part.
Reference  in this summary to the Preferred Securities and the Issuer Trust mean
the Preferred Securities of an Issuer Trust and such Issuer Trust, respectively,
to which a Guarantee relates. The Guarantee Trustee will hold each Guarantee for
the benefit of the holders of the related Issuer Trust's Preferred Securities.
 
GENERAL
 
    PacifiCorp will irrevocably agree to pay in full on a subordinated basis, to
the extent set forth  herein, the Guarantee Payments  (as defined below) to  the
holders of the Preferred Securities, as and when due, regardless of any defense,
right of set-off or counterclaim that such Issuer Trust may have or assert other
 
                                       28
<PAGE>
than  the  defense  of  payment.  The following  payments  with  respect  to the
Preferred Securities, to  the extent not  paid by  or on behalf  of the  related
Issuer  Trust (the "Guarantee Payments"), will  be subject to the Guarantee: (i)
any accumulated and unpaid Distributions required  to be paid on such  Preferred
Securities,  to the extent  that such Issuer  Trust has funds  on hand available
therefor, (ii) the  Redemption Price  with respect to  any Preferred  Securities
called  for redemption to  the extent that  such Issuer Trust  has funds on hand
available therefor,  and  (iii) upon  a  voluntary or  involuntary  dissolution,
winding  up or liquidation of such Issuer Trust (unless the Corresponding Junior
Subordinated  Debentures   are  distributed   to  holders   of  such   Preferred
Securities),  the  lesser of  (a) the  Liquidation  Amount plus  accumulated and
unpaid Distributions on the Preferred Securities  to the date of payment to  the
extent  that such Issuer Trust has funds  on hand available therefor and (b) the
amount of assets of  such Issuer Trust remaining  available for distribution  to
holders  of Preferred  Securities. PacifiCorp's  obligation to  make a Guarantee
Payment may be satisfied by direct payment of the required amounts by PacifiCorp
to the holders of the applicable  Preferred Securities or by causing the  Issuer
Trust to pay such amounts to such holders.
 
    Each  Guarantee will be an irrevocable  guarantee on a subordinated basis of
the related Issuer Trust's obligations under the Preferred Securities, but  will
apply  only to the extent that such related Issuer Trust has funds sufficient to
make such payments, and is not a guarantee of collection.
 
    If PacifiCorp does not  make interest payments  on the Corresponding  Junior
Subordinated  Debentures held by the Issuer Trust,  the Issuer Trust will not be
able to pay Distributions  on the Preferred Securities  and will not have  funds
available  therefor. Each Guarantee will rank subordinate and junior in right of
payment to  all  Senior  Indebtedness  of PacifiCorp.  See  "--  Status  of  the
Guarantee."   Except  as   otherwise  provided  in   the  applicable  Prospectus
Supplement, the Guarantees  do not  limit the  incurrence or  issuance of  other
secured  or unsecured  debt of  PacifiCorp, whether  under the  Indenture or any
existing or other  indenture that  PacifiCorp may enter  into in  the future  or
otherwise.
 
    PacifiCorp  has,  through  the applicable  Guarantee,  the  applicable Trust
Agreement, the Junior  Subordinated Debentures,  the Indenture  and the  Expense
Agreement   (as  defined   below),  taken   together,  fully,   irrevocably  and
unconditionally guaranteed  all  of the  Issuer  Trust's obligations  under  the
Preferred  Securities.  No  single  document  standing  alone  or  operating  in
conjunction with  fewer than  all  of the  other  documents constitutes  such  a
guarantee.  It is only  the combined operation  of these documents  that has the
effect of  providing a  full,  irrevocable and  unconditional guarantee  of  the
Issuer  Trust's obligations  under the  Preferred Securities.  See "Relationship
Among the  Preferred  Securities, the  Junior  Subordinated Debentures  and  the
Guarantee -- General."
 
STATUS OF THE GUARANTEE
 
    Each  Guarantee will  constitute an  unsecured obligation  of PacifiCorp and
will rank subordinate and junior in right of payment to all Senior Indebtedness.
 
    Each Guarantee will  rank pari  passu with  all other  Guarantees issued  by
PacifiCorp.  Each Guarantee  will constitute a  guarantee of payment  and not of
collection (i.e., the guaranteed party may institute a legal proceeding directly
against the guarantor to  enforce its rights under  the Guarantee without  first
instituting  a  legal  proceeding  against any  other  person  or  entity). Each
Guarantee will be held for the benefit  of the holders of the related  Preferred
Securities.  Each  Guarantee will  not be  discharged except  by payment  of the
Guarantee Payments in full to  the extent not paid by  the Issuer Trust or  upon
distribution  to the  holders of the  Preferred Securities  of the Corresponding
Junior Subordinated Debentures. None  of the Guarantees  places a limitation  on
the amount of additional Senior Indebtedness that may be incurred by PacifiCorp.
PacifiCorp   expects  from  time   to  time  to   incur  substantial  additional
indebtedness constituting Senior Indebtedness.
 
AMENDMENTS AND ASSIGNMENT
 
    Except with respect to any changes which do not materially adversely  affect
the rights of holders of the related Preferred Securities (in which case no vote
will be required), no Guarantee may be amended without the prior approval of the
holders  of not less than a majority  of the aggregate liquidation preference of
such outstanding Preferred Securities. The manner of obtaining any such approval
will be
 
                                       29
<PAGE>
as set forth under  "Description of the Preferred  Securities -- Voting  Rights;
Amendment  of Trust Agreement." All guarantees  and agreements contained in each
Guarantee  shall  bind   the  successors,  assigns,   receivers,  trustees   and
representatives  of PacifiCorp and shall inure to  the benefit of the holders of
the related Preferred Securities then outstanding.
 
EVENTS OF DEFAULT
 
    An event of  default under  each Guarantee will  occur upon  the failure  of
PacifiCorp  to perform any  of its payment or  other obligations thereunder. The
holders of  not less  than a  majority in  aggregate Liquidation  Amount of  the
related Preferred Securities 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 such  Guarantee or to  direct the exercise of  any trust or  power
conferred upon the Guarantee Trustee under such Guarantee.
 
    Any  holder of  the Preferred  Securities may  institute a  legal proceeding
directly against PacifiCorp to enforce  its rights under such Guarantee  without
first  instituting a  legal proceeding against  the Issuer  Trust, the Guarantee
Trustee or any other person or entity.
 
    PacifiCorp, as guarantor, is  required to file  annually with the  Guarantee
Trustee  a certificate as to whether or not PacifiCorp is in compliance with all
the conditions and covenants applicable to it under the Guarantee.
 
INFORMATION CONCERNING THE GUARANTEE TRUSTEE
 
    The Guarantee Trustee, other than during the occurrence and continuance of a
default by PacifiCorp  in performance  of any Guarantee,  undertakes to  perform
only  such duties  as are  specifically set forth  in each  Guarantee and, after
default with respect to any Guarantee, must exercise the same degree of care and
skill as a prudent person would exercise or use in the conduct of his or her own
affairs. Subject to this provision, the Guarantee Trustee is under no obligation
to exercise any of the  powers vested in it by  any Guarantee at the request  of
any holder of any Preferred Securities unless it is offered reasonable indemnity
against the costs, expenses and liabilities that might be incurred thereby.
 
TERMINATION OF THE GUARANTEE
 
    Each  Guarantee will terminate  and be of  no further force  and effect upon
full payment of the Redemption Price  of the related Preferred Securities,  upon
full payment of the amounts payable upon liquidation of the related Issuer Trust
or  upon  distribution of  Corresponding Junior  Subordinated Debentures  to the
holders of the related Preferred Securities. Each Guarantee will continue to  be
effective  or will be reinstated, as the case  may be, if at any time any holder
of the related Preferred Securities must restore payment of any sums paid  under
such Preferred Securities or such Guarantee.
 
GOVERNING LAW
 
    Each Guarantee will be governed by and construed in accordance with the laws
of the State of New York.
 
THE EXPENSE AGREEMENT
 
    Pursuant to an Expense Agreement entered into by PacifiCorp under each Trust
Agreement   (the   "Expense   Agreement"),  PacifiCorp   will   irrevocably  and
unconditionally guarantee to  each person  or entity  to whom  the Issuer  Trust
becomes  indebted  or  liable,  the  full  payment  of  any  costs,  expenses or
liabilities of the Issuer Trust, other  than obligations of the Issuer Trust  to
pay to the holders of any Preferred Securities or other similar interests in the
Issuer Trust the amounts due such holders pursuant to the terms of the Preferred
Securities or such other similar interests, as the case may be.
 
                          DESCRIPTION OF CORRESPONDING
                         JUNIOR SUBORDINATED DEBENTURES
 
    The  Corresponding Junior Subordinated Debentures are to be issued in one or
more series under  the Indenture with  terms corresponding to  the terms of  the
related   Preferred   Securities.  See   "Description  of   Junior  Subordinated
Debentures." This summary of  certain terms and provisions  of, or relating  to,
 
                                       30
<PAGE>
Corresponding  Junior Subordinated Debentures and the Indenture does not purport
to be complete and is subject to, and is qualified in its entirety by  reference
to,  the Indenture, the form of which is filed as an exhibit to the Registration
Statement of which this Prospectus forms a part, and to the Trust Indenture Act.
Whenever particular defined terms of  the Indenture (as supplemented or  amended
from  time to time) are  referred to herein or  in a Prospectus Supplement, such
defined terms are incorporated herein or therein by reference.
 
GENERAL
 
    Concurrently with the issuance of each Issuer Trust's Preferred  Securities,
such Issuer Trust will invest the proceeds thereof and the consideration paid by
PacifiCorp  for  the  Common  Securities in  a  series  of  Corresponding Junior
Subordinated Debentures issued by PacifiCorp  to such Issuer Trust. Each  series
of  Corresponding Junior Subordinated Debentures will be in the principal amount
equal to  the  aggregate stated  Liquidation  Amount of  the  related  Preferred
Securities  plus PacifiCorp's concurrent investment in the Common Securities and
will rank PARI PASSU  with all other series  of Junior Subordinated  Debentures.
The   Corresponding  Junior  Subordinated  Debentures   will  be  unsecured  and
subordinate and junior in right of payment  to the extent and in the manner  set
forth   in  the  Indenture  to  all   Senior  Indebtedness  of  PacifiCorp.  See
"Description  of  Junior  Subordinated  Debentures  --  Subordination"  and  the
Prospectus Supplement relating to any offering of related Preferred Securities.
 
OPTIONAL REDEMPTION
 
    The  applicable  Prospectus Supplement  will specify  the period  or periods
within which, the price  or prices at  which and the  terms and conditions  upon
which  the Corresponding  Junior Subordinated  Debentures of  any series  may be
redeemed, in whole or in part, at the option of PacifiCorp. Except as  otherwise
set  forth in the applicable Prospectus Supplement, the redemption price for any
Corresponding Junior Subordinated Debentures so  redeemed shall be equal to  any
accrued  and unpaid interest thereon to the  date fixed for redemption, plus the
principal amount thereof. See "Description of Junior Subordinated Debentures  --
Redemption."
 
    If  a  Special  Event in  respect  of an  Issuer  Trust shall  occur  and be
continuing, PacifiCorp  may,  at its  option,  redeem the  Corresponding  Junior
Subordinated  Debentures at any  time within 90  days of the  occurrence of such
Special Event,  in whole  but not  in part,  subject to  the provisions  of  the
Indenture.  The  redemption  price  for  any  Corresponding  Junior Subordinated
Debentures shall be equal to 100% of the principal amount of such  Corresponding
Junior Subordinated Debentures then outstanding plus accrued and unpaid interest
to the date fixed for redemption.
 
    For  so  long  as the  applicable  Issuer Trust  is  the holder  of  all the
outstanding series of Corresponding Junior Subordinated Debentures, the proceeds
of any such redemption will  be used by the Issuer  Trust to redeem the  related
Preferred Securities in accordance with their terms. PacifiCorp may not redeem a
series  of  Corresponding  Junior  Subordinated Debentures  in  part  unless all
accrued  and  unpaid  interest  has  been  paid  in  full  on  all   outstanding
Corresponding  Junior Subordinated  Debentures of  such series  for all interest
periods terminating on or prior to the Redemption Date.
 
CERTAIN COVENANTS OF PACIFICORP
 
    PacifiCorp will covenant in the applicable Supplemental Indenture as to each
series of Corresponding Junior Subordinated Debentures,  that if and so long  as
(i)  the Issuer  Trust of the  corresponding series of  Preferred Securities and
Common Securities is the  holder of all  such Corresponding Junior  Subordinated
Debentures, (ii) a Tax Event in respect of such Issuer Trust has occurred and is
continuing  and (iii) PacifiCorp has elected, and has not revoked such election,
to pay  Additional Sums  in  respect of  such  Preferred Securities  and  Common
Securities,  PacifiCorp  will pay  to such  Issuer  Trust such  Additional Sums.
PacifiCorp will  also  covenant,  as  to each  series  of  Corresponding  Junior
Subordinated Debentures, that it will not, and will not permit any subsidiary of
PacifiCorp to, (i) declare, set aside or pay any dividend or distribution on, or
repurchase,  redeem or otherwise  acquire, or make any  sinking fund payment for
the purchase or redemption of, any shares of its capital stock or (ii) make  any
payment  of principal, interest or premium, if any, on or repay or repurchase or
redeem any debt  securities (including other  Corresponding Junior  Subordinated
Debentures)   that   rank   pari   passu  with   or   junior   in   interest  to
 
                                       31
<PAGE>
the Corresponding Junior Subordinated Debentures or make any guarantee  payments
with  respect to  the foregoing  (other than  (a) dividends  or distributions in
shares of its capital stock or in rights to acquire shares of its capital stock,
(b) conversions  into  or  exchanges  for  shares  of  its  capital  stock,  (c)
redemptions, purchases or other acquisitions of shares of its capital stock made
for  the purpose of an employee incentive  plan or benefit plan of PacifiCorp or
any of its subsidiaries and mandatory redemptions or sinking fund payments  with
respect  to any  series of  Preferred Stock  of PacifiCorp  that are  subject to
mandatory redemption or sinking fund  requirements, provided that the  aggregate
stated value of all such series outstanding at the time of any such payment does
not  exceed five percent of  the aggregate of (1)  the total principal amount of
all bonds  or  other  securities representing  secured  indebtedness  issued  or
assumed  by PacifiCorp and then  outstanding and (2) the  capital and surplus of
PacifiCorp to  be stated  on the  books of  account of  PacifiCorp after  giving
effect  to such  payment, provided,  however, that  any moneys  deposited in any
sinking fund and not in violation of this provision may thereafter be applied to
the purchase or redemption of such Preferred Stock in accordance with the  terms
of  such  sinking fund  without  regard to  the  restrictions contained  in this
provision, and (d) payments  under any guarantee by  PacifiCorp with respect  to
any  securities of a  subsidiary of PacifiCorp, provided  that the proceeds from
the issuance  of  such securities  were  used to  purchase  Junior  Subordinated
Debentures  of any series under  the Indenture) if at  such time (i) there shall
have occurred any event of which  PacifiCorp has actual knowledge that (a)  with
the  giving  of  notice  or the  lapse  of  time, or  both,  would  constitute a
"Debenture Event of Default" under  the Indenture with respect to  Corresponding
Junior  Subordinated  Debentures of  such  series and  (b)  in respect  of which
PacifiCorp shall not have taken reasonable steps to cure, (ii) PacifiCorp  shall
be  in default with respect to its  payment of any obligations under the related
Guarantee or (iii)  PacifiCorp shall have  given notice of  its selection of  an
Extension  Period as  provided in  the Indenture  with respect  to Corresponding
Junior Subordinated Debentures of such series and shall not have rescinded  such
notice, or such Extension Period, or any extension thereof, shall be continuing.
 
    PacifiCorp  will also  covenant, as to  each series  of Corresponding Junior
Subordinated Debentures, (i) to maintain  directly or indirectly 100%  ownership
of  the  Common Securities  of the  Issuer Trust  to which  Corresponding Junior
Subordinated Debentures have been issued, provided that certain successors which
are permitted pursuant to the Indenture may succeed to PacifiCorp's ownership of
the Common Securities, (ii) not  to voluntarily terminate, wind-up or  liquidate
any  Issuer Trust, except (a) in connection with a distribution of Corresponding
Junior Subordinated Debentures  to the  holders of the  Preferred Securities  in
liquidation  of such  Issuer Trust  or (b)  in connection  with certain mergers,
consolidations or amalgamations  permitted by  the related  Trust Agreement  and
(iii) to use its reasonable efforts, consistent with the terms and provisions of
the  related Trust Agreement, to cause such Issuer Trust to remain classified as
a grantor  trust  and not  to  be classified  as  an association  taxable  as  a
corporation  for United States federal income tax purposes. PacifiCorp will also
make certain additional agreements relating to the Indenture as provided in  the
last  sentence of the first paragraph  under "Description of Junior Subordinated
Debentures -- Modification of Indenture."
 
                  RELATIONSHIP AMONG THE PREFERRED SECURITIES,
                THE CORRESPONDING JUNIOR SUBORDINATED DEBENTURES
                               AND THE GUARANTEES
 
    As long as payments of interest and other payments are made when due on each
series of Corresponding  Junior Subordinated Debentures,  such payments will  be
sufficient  to  cover  Distributions  and  other  payments  due  on  the related
Preferred Securities, primarily  because (i) the  aggregate principal amount  of
each series of Corresponding Junior Subordinated Debentures will be equal to the
sum  of the aggregate Liquidation Amount of the related Preferred Securities and
related Common Securities; (ii) the interest rate and interest and other payment
dates on each series of Corresponding Junior Subordinated Debentures will  match
the  Distribution rate and Distribution and  other payment dates for the related
Preferred Securities; (iii) PacifiCorp shall pay for all and any costs, expenses
and liabilities of
 
                                       32
<PAGE>
such Issuer  Trust except  the  Issuer Trust's  obligations  to holders  of  its
Preferred  Securities  under  such  Preferred Securities;  and  (iv)  each Trust
Agreement further provides that the Issuer Trust will not engage in any activity
that is not consistent with the limited purposes of such Issuer Trust.
 
    Payments of Distributions and other amounts due on the Preferred  Securities
(to  the extent  the Issuer Trust  has funds  available for the  payment of such
Distributions) are irrevocably guaranteed by PacifiCorp as and to the extent set
forth  under   "Description  of   Guarantees."  Taken   together,   PacifiCorp's
obligations  under each series of Junior Subordinated Debentures, the Indenture,
the related  Trust Agreement,  the related  Expense Agreement,  and the  related
Guarantee provide a full, irrevocable and unconditional guarantee of payments of
distributions  and  other  amounts  due  on  the  related  series  of  Preferred
Securities. No single document standing  alone or operating in conjunction  with
fewer than all of the other documents constitutes such guarantee. It is only the
combined  operation of these documents that has  the effect of providing a full,
irrevocable and unconditional guarantee of the Issuer Trust's obligations  under
the  Preferred Securities. If  and to the  extent that PacifiCorp  does not make
payments on any  series of  Corresponding Junior  Subordinated Debentures,  such
Issuer  Trust  will  not  pay  Distributions or  other  amounts  due  on related
Preferred Securities. The Guarantees do not cover payment of Distributions  when
the   related  Issuer  Trust  does  not   have  sufficient  funds  to  pay  such
Distributions. In such event, the remedies of a holder of a series of  Preferred
Securities  are  as described  above under  "Description of  Junior Subordinated
Debentures --  Debenture  Events  of  Default"  and  "Description  of  Preferred
Securities  -- Events of Default; Notice"  and "-- Enforcement of Certain Rights
by Holders of Preferred  Securities." The obligations  of PacifiCorp under  each
Guarantee  are  subordinate  and  junior  in  right  of  payment  to  all Senior
Indebtedness of PacifiCorp.
 
    Notwithstanding anything to  the contrary in  the Indenture, PacifiCorp  has
the  right to set-off  any payment it  is otherwise required  to make thereunder
with and to the  extent PacifiCorp has theretofore  made, or is concurrently  on
the date of such payment making, a payment under the related Guarantee.
 
    A  holder of any related Preferred Security may institute a legal proceeding
directly against PacifiCorp to  enforce its rights  under the related  Guarantee
without  first instituting a legal proceeding against the Guarantee Trustee, the
related Issuer Trust or any other person or entity.
 
    Each Issuer Trust's Preferred Securities  evidence a beneficial interest  in
such  Issuer Trust, and each Issuer Trust exists for the sole purpose of issuing
its Preferred  Securities  and  Common Securities  and  investing  the  proceeds
thereof  in Corresponding Junior Subordinated Debentures. A principal difference
between the  rights of  a holder  of  a Preferred  Security and  a holder  of  a
Corresponding  Junior Subordinated Debenture is that a holder of a Corresponding
Junior Subordinated  Debenture  is  entitled  to  receive  from  PacifiCorp  the
principal  amount of and  interest accrued on  Corresponding Junior Subordinated
Debentures held, while a holder of  Preferred Securities is entitled to  receive
Distributions  from such Issuer  Trust (or from  PacifiCorp under the applicable
Guarantee) if and to the  extent such Issuer Trust  has funds available for  the
payment of such Distributions.
 
    Upon  any voluntary or involuntary termination, winding-up or liquidation of
any  Issuer  Trust  involving  the  liquidation  of  the  Corresponding   Junior
Subordinated Debentures, the holders of the related Preferred Securities will be
entitled  to  receive,  out  of  assets held  by  such  Issuer  Trust  and after
satisfaction of liabilities  to creditors of  such Issuer Trust  as provided  by
applicable  law,  the  Liquidation  Distribution in  cash.  See  "Description of
Preferred Securities  -- Liquidation  Distribution Upon  Termination." Upon  any
voluntary  or involuntary liquidation or  bankruptcy of PacifiCorp, the Property
Trustee, as holder of the Corresponding Junior Subordinated Debentures, would be
a subordinated creditor of PacifiCorp, subordinated  in right of payment to  all
Senior  Indebtedness, but entitled  to receive payment in  full of principal and
interest,  before   any  shareholders   of   PacifiCorp  receive   payments   or
distributions.  Since PacifiCorp is  the guarantor under  each Guarantee and has
agreed to  pay for  all costs,  expenses and  liabilities of  each Issuer  Trust
(other  than  the Issuer  Trust's obligations  to the  holders of  its Preferred
Securities), the  positions of  a holders  of such  Preferred Securities  and  a
holder  of such Corresponding  Junior Subordinated Debentures  relative to other
creditors and  to shareholders  of PacifiCorp  in the  event of  liquidation  or
bankruptcy of PacifiCorp would be substantially the same.
 
                                       33
<PAGE>
    A  default or event  of default under any  Senior Indebtedness of PacifiCorp
will not constitute a default or Event of Default under the Indenture.  However,
in  the event of payment defaults under, or acceleration of, Senior Indebtedness
of PacifiCorp, the  subordination provisions  of the Indenture  provide that  no
payments  may  be  made  in respect  of  the  Corresponding  Junior Subordinated
Debentures until such Senior Indebtedness has  been paid in full or any  payment
default  thereunder has been cured or  waived. Failure to make required payments
on any series of Corresponding Junior Subordinated Debentures would constitute a
Debenture Event of Default under the Indenture with respect to such series.
 
                              PLAN OF DISTRIBUTION
 
    PacifiCorp may sell any  series of the  Junior Subordinated Debentures,  and
each  Issuer  Trust  may  sell  any  series  of  Preferred  Securities,  through
underwriters, dealers or  agents, or  directly to  one or  more purchasers.  The
Prospectus  Supplement with respect  to the securities  offered thereby will set
forth the terms of the offering  of such Offered Securities, including the  name
or  names of  any underwriters,  dealers or agents,  the purchase  price of such
Offered Securities and the  proceeds to PacifiCorp or  the Issuer Trust, as  the
case  may  be,  from  such  sale, any  underwriting  discounts  and  other items
constituting underwriters' or agents' compensation, any initial public  offering
price and any discounts or concessions allowed or reallowed or paid to dealers.
 
    If  underwriters are  involved in the  sale of any  Offered Securities, such
Offered Securities will be  acquired by the underwriters  for their own  account
and  may be  resold from  time to  time in  one or  more transactions, including
negotiated transactions, at a fixed public  offering price or at varying  prices
determined  at the time of sale. The underwriter or underwriters with respect to
a particular underwritten offering  of Offered Securities will  be named in  the
Prospectus  Supplement  relating  to  such  offering  and,  if  an  underwriting
syndicate is used, the managing underwriter or underwriters will be set forth on
the cover page of such Prospectus Supplement. Unless otherwise set forth in such
Prospectus Supplement,  the  obligations of  the  underwriters to  purchase  the
Offered  Securities will  be subject  to certain  conditions precedent,  and the
underwriters will be obligated  to purchase all such  Offered Securities if  any
are purchased.
 
    If  a dealer is used in the  sale of any Offered Securities, PacifiCorp will
sell such Offered Securities  to the dealer, as  principal. The dealer may  then
resell  such Offered Securities to the public at varying prices to be determined
by such dealer  at the  time of resale.  The name  of any dealer  involved in  a
particular  offering  of Offered  Securities  and any  discounts  or concessions
allowed or reallowed or paid to the  dealer will be set forth in the  Prospectus
Supplement relating to such offering.
 
    The  Offered Securities may be sold directly by PacifiCorp or through agents
designated by PacifiCorp from time to time. Any such agent, who may be deemed to
be an underwriter as that term is defined in the Securities Act, involved in the
offer or  sale  of  any  of  the Offered  Securities  will  be  named,  and  any
commissions  payable  by PacifiCorp  to such  agent  will be  set forth,  in the
Prospectus Supplement relating to such offer or sale. Unless otherwise indicated
in such Prospectus  Supplement, any such  agent will be  acting on a  reasonable
best efforts basis for the period of its appointment.
 
    Certain  of the underwriters, dealers or  agents and their associates may be
customers of, engage in the transactions with or perform services for PacifiCorp
and/or the applicable Issuer Trust and/or any of their respective affiliates  in
the ordinary course of business.
 
    PacifiCorp  will indicate in a Prospectus  Supplement the extent to which it
anticipates  that  a  secondary  market  for  the  Offered  Securities  will  be
available.
 
    Underwriters,  dealers and agents  participating in the  distribution of the
Offered Securities may be deemed to be "underwriters" within the meaning of, and
any discounts and commissions received by  them and any profit realized by  them
on  resale of such Offered Securities may be deemed to be underwriting discounts
and commissions  under,  the  Securities Act.  Subject  to  certain  conditions,
 
                                       34
<PAGE>
PacifiCorp  and the applicable Issuer Trustee may agree to indemnify the several
underwriters, dealers or  agents and their  controlling persons against  certain
civil liabilities, including certain liabilities under the Securities Act, or to
contribute  to  payments any  such person  may  be required  to make  in respect
thereof.
 
                                 LEGAL OPINIONS
 
    Unless otherwise indicated in the applicable Prospectus Supplement,  certain
legal  matters in connection with the Offered Securities, including the validity
of the Junior Subordinated Debentures, the Indenture and the Guarantee, will  be
passed  upon for PacifiCorp and each Issuer  Trust by Stoel Rives LLP, Portland,
Oregon, and for  the underwriters by  Winthrop, Stimson, Putnam  & Roberts,  New
York,  New York. Certain matters of Delaware law relating to the validity of the
Preferred Securities,  the  enforceability  of  each  Trust  Agreement  and  the
creation  of each Issuer Trust will be passed upon by Richards, Layton & Finger,
P.A., as special Delaware counsel to  PacifiCorp and the Issuer Trusts.  Certain
tax  matters in connection with the Preferred Securities will be passed upon for
PacifiCorp and each Issuer Trust by Stoel Rives LLP. John M. Schweitzer and John
Detjens III, who are  assistant secretaries of PacifiCorp,  are partners in  the
firm of Stoel Rives LLP.
 
                                    EXPERTS
 
    The  financial statements incorporated in  this Prospectus by reference from
PacifiCorp's Annual Report on Form 10-K  have been audited by Deloitte &  Touche
LLP,  independent auditors, as  stated in their  reports, which are incorporated
herein by reference (which reports express an unqualified opinion and include an
explanatory  paragraph  relating  to  PacifiCorp's  change  in  its  method   of
accounting for income taxes and other postretirement benefits), and have been so
incorporated  herein in reliance upon the reports  of such firm given upon their
authority of as experts in accounting and auditing.
 
    With  respect  to  any  unaudited  interim  financial  information  that  is
incorporated  herein by  reference, Deloitte &  Touche LLP  have applied limited
procedures in  accordance  with professional  standards  for a  review  of  such
information.  However,  as  stated  in their  reports  included  in PacifiCorp's
Quarterly Reports on Form  10-Q incorporated by reference  herein, they did  not
audit  and they do not express an opinion on that interim financial information.
Accordingly, the degree of reliance on their reports on such information  should
be  restricted in light of the limited  nature of the review procedures applied.
Deloitte & Touche LLP are not subject to the liability provisions of Section  11
of  the  Securities Act  for their  reports on  the unaudited  interim financial
information because  those  reports  are  not  "reports"  or  a  "part"  of  the
Registration  Statement of which this Prospectus is a part prepared or certified
by an accountant within the meaning of Sections 7 and 11 of the Securities Act.
 
                                       35
<PAGE>
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    NO  PERSON  HAS BEEN  AUTHORIZED  TO GIVE  ANY  INFORMATION OR  TO  MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS SUPPLEMENT OR  THE
PROSPECTUS,  AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT
BE RELIED UPON  AS HAVING BEEN  AUTHORIZED. THIS PROSPECTUS  SUPPLEMENT AND  THE
PROSPECTUS DO NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO
BUY  ANY  SECURITIES  OTHER THAN  THE  SECURITIES DESCRIBED  IN  THIS PROSPECTUS
SUPPLEMENT AND THE  PROSPECTUS OR AN  OFFER TO  SELL OR THE  SOLICITATION OF  AN
OFFER  TO  BUY SUCH  SECURITIES  IN ANY  CIRCUMSTANCES  IN WHICH  SUCH  OFFER OR
SOLICITATION IS UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS SUPPLEMENT AND
THE PROSPECTUS  NOR ANY  SALE  MADE HEREUNDER  SHALL, UNDER  ANY  CIRCUMSTANCES,
CREATE  ANY  IMPLICATION  THAT  THERE  HAS BEEN  NO  CHANGE  IN  THE  AFFAIRS OF
PACIFICORP SINCE THE  DATE HEREOF OR  THAT THE INFORMATION  CONTAINED HEREIN  OR
THEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE.
                                 --------------
 
                               TABLE OF CONTENTS
<TABLE>
<S>                                                                         <C>
                             PROSPECTUS SUPPLEMENT
                                                                            PAGE
                                                                            ----
Risk Factors..............................................................   S-4
PacifiCorp Capital I......................................................   S-7
PacifiCorp................................................................   S-8
Use of Proceeds...........................................................   S-8
Selected Financial Information............................................   S-9
Accounting Treatment......................................................  S-10
Certain Terms of Series A Preferred Securities............................  S-11
Certain Terms of Series C Debentures......................................  S-13
Certain Federal Income Tax Considerations.................................  S-16
Underwriting..............................................................  S-19
Legal Opinions............................................................  S-20
 
<CAPTION>
 
                                   PROSPECTUS
<S>                                                                         <C>
Available Information.....................................................     3
Incorporation of Certain Documents by Reference...........................     3
PacifiCorp................................................................     4
The Issuer Trusts.........................................................     4
Use of Proceeds...........................................................     5
Consolidated Ratios of Earnings to Fixed Charges..........................     6
Description of Junior Subordinated Debentures.............................     6
Description of Preferred Securities.......................................    16
Description of Guarantees.................................................    28
Description of Corresponding Junior Subordinated Debentures...............    30
Relationship Among the Preferred Securities, the Corresponding Junior
 Subordinated Debentures and the Guarantees...............................    32
Plan of Distribution......................................................    34
Legal Opinions............................................................    35
Experts...................................................................    35
</TABLE>
 
                         8,680,000 PREFERRED SECURITIES
 
                              PACIFICORP CAPITAL I
 
                          8 1/4% CUMULATIVE QUARTERLY
                          INCOME PREFERRED SECURITIES,
                               SERIES A (QUIPSSM)
 
                      GUARANTEED TO THE EXTENT PACIFICORP
                        CAPITAL I HAS FUNDS AS SET FORTH
                                   HEREIN BY
 
                               [PACIFICORP LOGO]
 
                               ------------------
 
                             PROSPECTUS SUPPLEMENT
 
                               ------------------
 
                              GOLDMAN, SACHS & CO.
 
                               SMITH BARNEY INC.
 
                           DEAN WITTER REYNOLDS INC.
 
                           A.G. EDWARDS & SONS, INC.
 
                              MERRILL LYNCH & CO.
 
                      REPRESENTATIVES OF THE UNDERWRITERS
 
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