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                                   PACIFICORP
                            (AN OREGON CORPORATION)

                                       TO

                         MORGAN GUARANTY TRUST COMPANY
                                  OF NEW YORK
                            (A NEW YORK CORPORATION)

                        WHICH HEREIN RESIGNS AS TRUSTEE

                                      AND

                                 CHEMICAL BANK
                            (A NEW YORK CORPORATION)

                      HEREIN BECOMING SUCCESSOR TRUSTEE TO
                   MORGAN GUARANTY TRUST COMPANY OF NEW YORK

                                AS TRUSTEE UNDER PACIFICORP'S
                                  MORTGAGE AND DEED OF TRUST,
                                  DATED AS OF JANUARY 9, 1989

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

                          TENTH SUPPLEMENTAL INDENTURE
                           DATED AS OF AUGUST 1, 1994

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

      THIS INSTRUMENT GRANTS A SECURITY INTEREST BY A TRANSMITTING UTILITY
          THIS INSTRUMENT CONTAINS AFTER-ACQUIRED PROPERTY PROVISIONS

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                          TENTH SUPPLEMENTAL INDENTURE

    THIS  INDENTURE, dated as of  the 1st day of  August, 1994, made and entered
into by and among (a)  PACIFICORP, a corporation of  the State of Oregon,  whose
address  is  700 NE  Multnomah,  Portland, Oregon  97232  (hereinafter sometimes
called the "Company"), (b) MORGAN GUARANTY TRUST COMPANY OF NEW YORK, a New York
corporation, whose address  is 60  Wall Street, New  York, New  York 10260  (the
"Resigning  Trustee"),  and  (c) CHEMICAL  BANK,  a New  York  corporation whose
address is  450 West  33rd Street,  New  York, New  York 10001  (the  "Successor
Trustee"),  as Trustee under the Mortgage and Deed of Trust, dated as of January
9,  1989,  as  heretofore  amended  and  supplemented  (hereinafter  called  the
"Mortgage"),  is executed  and delivered  by PacifiCorp  in accordance  with the
provisions of  the  Mortgage,  this indenture  (hereinafter  called  the  "Tenth
Supplemental Indenture") being supplemental thereto.

    WHEREAS,  the Mortgage was or  is to be recorded  in the official records of
the States of Arizona, California, Colorado, Idaho, Montana, New Mexico, Oregon,
Utah, Washington  and Wyoming  and various  counties within  such states,  which
counties  include or will include all  counties in which this Tenth Supplemental
Indenture is to be recorded; and

    WHEREAS, by the Mortgage  the Company covenanted that  it would execute  and
deliver  such supplemental indenture or  indentures and such further instruments
and do such  further acts  as might  be necessary or  proper to  carry out  more
effectually  the purposes of the Mortgage and to make subject to the Lien of the
Mortgage any property thereafter acquired,  made or constructed and intended  to
be subject to the Lien thereof; and

    WHEREAS,  in addition to the property described in the Mortgage, the Company
has acquired certain other property, rights and interests in property; and

                                       2

    WHEREAS,  the   Company  has   executed,  delivered,   recorded  and   filed
Supplemental Indentures as follows:



                    DATED AS OF
             -------------------------
          
First        March 31, 1989
Second       December 29, 1989
Third        March 31, 1991
Fourth       December 31, 1991
Fifth        March 15, 1992
Sixth        July 31, 1992
Seventh      March 15, 1993
Eighth       November 1, 1993;
Ninth        June 1, 1994;


and

    WHEREAS,   the  Company  has  heretofore  issued,  in  accordance  with  the
provisions of the  Mortgage, bonds  entitled and designated  First Mortgage  and
Collateral Trust Bonds, of the series and in the principal amounts as follows:



                                                         AGGREGATE          AGGREGATE
                                                     PRINCIPAL AMOUNT   PRINCIPAL AMOUNT
                       SERIES            DUE DATE         ISSUED           OUTSTANDING
              ------------------------  -----------  -----------------  -----------------
                                                              
First         --10.45%                      1/9/90     $         500,000                  0
Second        --Medium-Term Notes,          various          250,000,000  $     240,000,000
                 Series A
Third         --Medium-Term Notes,          various          200,000,000        175,000,000
                 Series B
Fourth        --Medium-Term Notes,          various          300,000,000        289,428,781
                 Series C
Fifth         --Medium-Term Notes,          various          250,000,000        250,000,000
                 Series D
Sixth         --C-U                         various          250,432,000        236,471,000
Seventh       --Medium-Term Notes,          various          500,000,000        500,000,000
                 Series E
Eighth        --6 3/4%                     4/1/2005          150,000,000        150,000,000
Ninth         --Medium-Term Notes,          various          480,000,000        480,000,000
                 Series F
Tenth         --E-L                         various           71,200,000         71,200,000
Eleventh      --Medium-Term Notes,          various                    0                  0;
                 Series G


and

                                       3

    WHEREAS, Section 2.03 of the Mortgage provides that the form or forms, terms
and  conditions of and other matters not inconsistent with the provisions of the
Mortgage, in connection with each series of bonds (other than the First  Series)
issued  thereunder,  shall  be  established  in  or  pursuant  to  one  or  more
Resolutions and/or shall be established  in one or more indentures  supplemental
to the Mortgage, prior to the initial issuance of bonds of such series; and

    WHEREAS,  Section 22.04 of  the Mortgage provides,  among other things, that
any power, privilege or right expressly or  impliedly reserved to or in any  way
conferred upon the Company by any provision of the Mortgage, whether such power,
privilege  or right is in any way restricted or is unrestricted, may be in whole
or in part waived or surrendered or subjected to any restriction if at the  time
unrestricted or to additional restriction if already restricted, and the Company
may  enter into any  further covenants, limitations,  restrictions or provisions
for the benefit of any one or more series of bonds issued thereunder and provide
that a breach thereof shall  be equivalent to a  Default under the Mortgage,  or
the  Company may  cure any ambiguity  contained therein, or  in any supplemental
indenture, or may  (in lieu  of establishment in  or pursuant  to Resolution  in
accordance  with Section  2.03 of the  Mortgage) establish the  forms, terms and
provisions of any series of bonds other than said First Series, by an instrument
in writing executed by the Company; and

    WHEREAS, the  Company  now desires  to  create a  new  series of  bonds  and
(pursuant  to the  provisions of Section  22.04 of  the Mortgage) to  add to its
covenants and agreements contained in  the Mortgage certain other covenants  and
agreements to be observed by it; and

    WHEREAS,   the  execution  and  delivery  by   the  Company  of  this  Tenth
Supplemental Indenture, and the terms of the bonds of the Twelfth series  herein
referred  to, have been duly authorized by the Board of Directors in or pursuant
to appropriate Resolutions;

    NOW, THEREFORE, THIS INDENTURE WITNESSETH:

    That PACIFICORP, an Oregon corporation, in consideration of the premises and
of good and valuable consideration to it  duly paid by the Trustee at or  before
the ensealing and delivery of these presents, the

                                       4

receipt  and sufficiency whereof is hereby  acknowledged, and in order to secure
the payment of both the  principal of and interest and  premium, if any, on  the
bonds  from time to time issued under the Mortgage, according to their tenor and
effect and the  performance of  all provisions  of the  Mortgage (including  any
instruments  supplemental thereto and  any modification made  as in the Mortgage
provided) and of such bonds, and to confirm the Lien of the Mortgage on  certain
after-acquired  property,  hereby  mortgages,  pledges  and  grants  a  security
interest in (subject, however,  to Excepted Encumbrances  as defined in  Section
1.06  of the Mortgage), unto Chemical Bank,  as Trustee, and to its successor or
successors in said  trust, and to  said Trustee and  its successors and  assigns
forever,  all properties of the  Company real, personal and  mixed, owned by the
Company as of the  date of the  Mortgage and acquired by  the Company after  the
date  of  the  Mortgage, subject  to  the  provisions of  Section  18.03  of the
Mortgage, of any kind or nature (except any herein or in the Mortgage  expressly
excepted),  now owned  or, subject  to the  provisions of  Section 18.03  of the
Mortgage, hereafter acquired by the Company (by purchase, consolidation, merger,
donation, construction, erection or in any other way) and wheresoever  situated,
including  the properties described  in Articles V and  VI hereof, and including
(without limitation) all  real estate, lands,  easements, servitudes,  licenses,
permits,  franchises, privileges, rights of way  and other rights in or relating
to real estate or the  occupancy of the same;  all power sites, flowage  rights,
water   rights,   water  locations,   water  appropriations,   ditches,  flumes,
reservoirs, reservoir  sites,  canals,  raceways, waterways,  dams,  dam  sites,
aqueducts,  and all other rights or  means for appropriating, conveying, storing
and supplying water; all rights of way and roads; all plants for the  generation
of  electricity  and  other forms  of  energy  (whether now  known  or hereafter
developed)  by  steam,  water,  sunlight,  chemical  processes  and/or  (without
limitation)  all  other  sources  of  power  (whether  now  known  or  hereafter
developed); all power houses, gas plants, street lighting systems, standards and
other equipment incidental thereto; all  telephone, radio, television and  other
communications,  image and  data transmission  systems, air-conditioning systems
and equipment  incidental thereto,  water wheels,  water works,  water  systems,
steam  and hot  water plants,  substations, lines,  service and  supply systems,
bridges, culverts, tracks, ice or

                                       5

refrigeration plants and equipment, offices, buildings and other structures  and
the  equipment  thereof;  all machinery,  engines,  boilers,  dynamos, turbines,
electric,  gas   and  other   machines,   prime  movers,   regulators,   meters,
transformers,   generators  (including,   but  not   limited  to,  engine-driven
generators and  turbogenerator units),  motors, electrical,  gas and  mechanical
appliances,  conduits, cables, water,  steam, gas or other  pipes, gas mains and
pipes, service pipes,  fittings, valves and  connections, pole and  transmission
lines,   towers,   overhead  conductors   and  devices,   underground  conduits,
underground conductors and devices, wires, cables, tools, implements, apparatus,
storage battery equipment and all  other fixtures and personalty; all  municipal
and  other franchises, consents  or permits; all lines  for the transmission and
distribution of electric current and other forms of energy, gas, steam, water or
communications, images and data for any purpose including towers, poles,  wires,
cables, pipes, conduits, ducts and all apparatus for use in connection therewith
and  (except as  herein or  in the Mortgage  expressly excepted)  all the right,
title and interest of the  Company in and to all  other property of any kind  or
nature  appertaining to and/or used and/or occupied and/or enjoyed in connection
with any property hereinbefore described;

    TOGETHER WITH all and singular the tenements, hereditaments,  prescriptions,
servitudes  and  appurtenances  belonging  or  in  anywise  appertaining  to the
aforesaid property  or any  part  thereof, with  the reversion  and  reversions,
remainder  and remainders and (subject to the provisions of Section 13.01 of the
Mortgage) the  tolls, rents,  revenues, issues,  earnings, income,  product  and
profits  thereof,  and  all the  estate,  right,  title and  interest  and claim
whatsoever, at  law as  well as  in equity,  which the  Company now  has or  may
hereafter acquire in and to the aforesaid property and franchises and every part
and parcel thereof.

    IT  IS  HEREBY AGREED  by the  Company  that, subject  to the  provisions of
Section 18.03 of the Mortgage, all the property, rights and franchises  acquired
by  the  Company (by  purchase,  consolidation, merger,  donation, construction,
erection or in any other way) after the date hereof, except any herein or in the
Mortgage expressly excepted,  shall be and  are as fully  mortgaged and  pledged
hereby and as fully embraced within the Lien of

                                       6

the  Mortgage as if such  property, rights and franchises  were now owned by the
Company and were specifically described herein or in the Mortgage and  mortgaged
hereby or thereby.

    PROVIDED  THAT  the following  are not  and are  not intended  to be  now or
hereafter mortgaged or  pledged hereunder,  nor is a  security interest  therein
hereby  granted or  intended to  be granted, and  the same  are hereby expressly
excepted from the Lien and operation  of the Mortgage, namely: (1) cash,  shares
of  stock, bonds, notes and other obligations and other securities not hereafter
specifically pledged, paid, deposited, delivered  or held under the Mortgage  or
covenanted  so  to  be;  (2)  merchandise,  equipment,  apparatus,  materials or
supplies held for the purpose of sale  or other disposition in the usual  course
of  business or for the purpose of repairing or replacing (in whole or part) any
rolling stock, buses, motor coaches,  automobiles or other vehicles or  aircraft
or  boats, ships or other  vessels, and any fuel,  oil and similar materials and
supplies consumable in the  operation of any of  the properties of the  Company;
rolling  stock, buses,  motor coaches,  automobiles and  other vehicles  and all
aircraft;  boats,  ships  and  other  vessels;  all  crops  (both  growing   and
harvested),  timber (both  growing and harvested),  minerals (both  in place and
severed),  and  mineral  rights  and  royalties;  (3)  bills,  notes  and  other
instruments and accounts receivable, judgments, demands, general intangibles and
choses  in  action,  and  all contracts,  leases  and  operating  agreements not
specifically pledged under the Mortgage or covenanted so to be; (4) the last day
of the term of any lease or leasehold which may be or become subject to the Lien
of the  Mortgage;  (5)  electric  energy,  gas,  water,  steam,  ice  and  other
materials,  forms  of energy  or products  generated, manufactured,  produced or
purchased by the Company for sale, distribution or use in the ordinary course of
its business; (6) any  natural gas wells  or natural gas  leases or natural  gas
transportation  lines or other works or  property used primarily and principally
in the  production of  natural  gas or  its  transportation, primarily  for  the
purpose  of sale to  natural gas customers  or to a  natural gas distribution or
pipeline company, up to  the point of connection  with any distribution  system;
(7)  the Company's franchise to  be a corporation; (8)  any interest (as lessee,
owner or otherwise) in the  Wyodak Facility, including, without limitation,  any
equipment,   parts,   improvements,   substitutions,   replacements   or   other

                                       7

property  relating  thereto;  (9)  all  properties  that  PacifiCorp,  a   Maine
corporation,  and/or  Utah  Power  &  Light  Company,  a  Utah  corporation, had
contracted to  dispose of  and that  had been  released from  the liens  of  the
Pacific  Mortgage and the Utah Mortgage, respectively, prior to January 9, 1989,
but title to which  properties had not  passed to the  grantee(s) thereof as  of
said  date; and (10) any property  heretofore released pursuant to any provision
of the  Mortgage  and not  heretofore  disposed  of by  the  Company;  provided,
however,  that  the property  and rights  expressly excepted  from the  Lien and
operation of the Mortgage in  the above subdivisions (2)  and (3) shall (to  the
extent permitted by law) cease to be so excepted in the event and as of the date
that  the  Trustee or  a  receiver for  the Trustee  shall  enter upon  and take
possession of  the Mortgaged  and Pledged  Property in  the manner  provided  in
Article XV of the Mortgage by reason of the occurrence of a Default;

    AND  PROVIDED FURTHER, that as to any property of the Company that, pursuant
to the after-acquired property provisions  thereof, is now or hereafter  becomes
subject  to the lien of  a mortgage, deed of trust  or similar indenture that is
now or may  in accordance  with the Mortgage  hereafter become  designated as  a
Class "A" Mortgage, the Lien hereof shall at all times be junior and subordinate
to the lien of such Class "A" Mortgage;

    TO HAVE AND TO HOLD all such properties, real, personal and mixed, mortgaged
and  pledged, or in which a security interest has been granted by the Company as
aforesaid, or intended so to be  (subject, however, to Excepted Encumbrances  as
defined  in Section 1.06 of  the Mortgage), unto Chemical  Bank, as Trustee, and
its successors and assigns forever;

    IN TRUST NEVERTHELESS, for the same purposes and upon the same terms, trusts
and conditions and subject to  and with the same  provisos and covenants as  are
set  forth in the Mortgage, this Tenth Supplemental Indenture being supplemental
to the Mortgage.

    AND IT IS HEREBY COVENANTED by  the Company that all the terms,  conditions,
provisos,  covenants and provisions  contained in the  Mortgage shall affect and
apply to the property hereinbefore described  and conveyed, and to the  estates,
rights,  obligations  and  duties  of  the  Company  and  the  Trustee  and  the
beneficiaries of the trust with respect to said

                                       8

property, and to the Trustee  and its successor or  successors in the trust,  in
the  same manner and with the same effect as if the said property had been owned
by the  Company at  the time  of the  execution of  the Mortgage,  and had  been
specifically  and at  length described  in and conveyed  to said  Trustee by the
Mortgage as a part of the property therein stated to be conveyed.

    The Company further  covenants and agrees  to and with  the Trustee and  its
successor or successors in such trust under the Mortgage, as follows:

                                   ARTICLE I

             REGARDING THE RESIGNATION OF THE RESIGNING TRUSTEE AND
                        APPOINTMENT OF SUCCESSOR TRUSTEE

    SECTION 1.01. Morgan Guaranty Trust Company of New York hereby gives written
notice to the Company that it hereby resigns as Trustee under the Mortgage, such
resignation to take effect as of September 1, 1994.

    SECTION 1.02. Pursuant to Section 19.15 of the Mortgage, and by order of its
Board  of Directors,  the Company hereby  accepts the  foregoing resignation and
appoints Chemical Bank as Successor Trustee under the Mortgage, effective as  of
September  1, 1994.  By execution hereof  Chemical Bank  hereby acknowledges its
acceptance of its  appointment by  the Company  as Successor  Trustee under  the
Mortgage.

    SECTION 1.03. The Resigning Trustee hereby conveys, assigns and transfers to
the Successor Trustee, and its successors and assigns, upon the trusts expressed
in the Mortgage (as amended hereby), all rights, title, powers and trusts of the
Resigning  Trustee under and pursuant to the Mortgage and all property and money
held by the Resigning Trustee under the Mortgage. The Resigning Trustee and  the
Company  agree, upon request  of the Successor  Trustee, to execute, acknowledge
and deliver such further instruments of conveyance and further assurances and to
do such other things as may reasonably be required for more fully and  certainly
vesting  in and confirming  to the Successor Trustee  such rights, title, powers
and trusts.

                                       9

                                   ARTICLE II

                            TWELFTH SERIES OF BONDS

    SECTION 2.01. There  shall be a  series of bonds  designated "Series  1994-1
Bonds" (herein sometimes referred to as the Twelfth Series), each of which shall
also  bear the descriptive title "First Mortgage and Collateral Trust Bond," and
the form thereof,  which shall be  established by or  pursuant to a  Resolution,
shall  contain suitable  provisions with respect  to the  matters hereinafter in
this Section specified.

   (I)  Bonds of  the  Twelfth  Series  shall  mature  on  such  date  or  dates
not  more than  30 years  from the  date of issue  as shall  be set  forth in or
determined in accordance with  a Resolution filed with  the Trustee and,  unless
otherwise  established by or pursuant to a  Resolution, shall be issued as fully
registered bonds in the denomination of Five Thousand Dollars and, at the option
of the  Company, of  any multiple  or multiples  of Five  Thousand Dollars  (the
exercise of such option to be evidenced by the execution and delivery thereof).

  (II)  Bonds  of  the  Twelfth  Series  shall bear  interest  at  such  rate or
rates (which may either be fixed or  variable), payable on such dates, and  have
such other terms and provisions not inconsistent with the Mortgage as may be set
forth  in or determined in accordance with  a Resolution filed with the Trustee.
Bonds of the Twelfth Series shall be dated and shall accrue interest as provided
in Section 2.06 of the Mortgage.

  (III) The  principal   of  and   interest  on   each  bond   of  the   Twelfth
Series shall be payable at the office or agency of the Company in the Borough of
Manhattan,  The City of New York, in such  coin or currency of the United States
of America as  at the time  of payment is  legal tender for  public and  private
debts or in such other currency or currency unit as shall be determined by or in
accordance with a Resolution filed with the Trustee.

  (IV)  Each   bond  of   the  Twelfth  Series   may  be   redeemable  prior  to
maturity at the option of the Company, as determined by or in accordance with  a
Resolution filed with the Trustee.

                                       10

  (V)   Each  bond  of  the Twelfth  Series  may  be subject  to  the obligation
of the Company to  redeem such bond,  as determined by or  in accordance with  a
Resolution filed with the Trustee.

   (VI) Each   bond  of  the  Twelfth  Series  may  have  such  other  terms  as
are not  inconsistent with  Section  2.03 of  the Mortgage,  including,  without
limitation,  terms  and  conditions  regarding interest  rates  and  the payment
thereof, place or places for  payment, exchange privileges, rights with  respect
to  redemption, prepayment  or purchase, and  default provisions, and  as may be
determined by or in accordance with a Resolution filed with the Trustee.

  (VII) At the  option  of  the  registered owner,  any  bonds  of  the  Twelfth
Series,  upon surrender thereof for cancellation at  the office or agency of the
Company in the Borough of Manhattan, The City of New York, shall be exchangeable
for a like  aggregate principal  amount of  bonds of  the same  series of  other
authorized denominations.

  (VIII) Bonds  of  the  Twelfth Series  shall  be transferable,  subject to any
restrictions thereon set forth in any such bond of the Twelfth Series, upon  the
surrender  therefor  for cancellation,  together  with a  written  instrument of
transfer in form approved by the registrar duly executed by the registered owner
or by his duly authorized  attorney, at the office or  agency of the Company  in
the Borough of Manhattan, The City of New York. Upon any transfer or exchange of
bonds  of the Twelfth Series, the Company  may make a charge therefor sufficient
to reimburse it for any tax or taxes or other government charge, as provided  in
Section  2.08 of the Mortgage, but the Company hereby waives any right to make a
charge in addition thereto for any exchange or transfer of bonds of the  Twelfth
Series.

  (IX)  After   the   execution  and   delivery   of  this   Tenth  Supplemental
Indenture and upon compliance with the applicable provisions of the Mortgage and
this Tenth Supplemental  Indenture, it is  contemplated that there  shall be  an
issue  of bonds of  the Twelfth Series  in an aggregate  principal amount not to
exceed Two  Hundred Twenty-Five  Million Dollars  ($225,000,000). Bonds  of  the
Twelfth  Series shall be issued pro rata on  the basis of Class "A" Bonds of the
Fifty-eighth Series,  designated "First  Mortgage  Bond Series  1994-1,"  issued
under each of the Utah

                                       11

Mortgage and the Pacific Mortgage and delivered to the Trustee. The claim of the
registered  owner of any such  Class "A" Bond shall  be limited to the principal
amount of the bonds of the Twelfth Series issued and Outstanding on the basis of
such Class "A" Bond.

  (X)   Upon  receipt  by  the   Trustee  from  time  to   time  of  a   written
request  or  requests (stating  that the  Trustee  holds an  aggregate principal
amount of Class "A" Bonds of the Fifty-eighth Series, designated "First Mortgage
Bond Series 1994-1,"  issued under the  Utah Mortgage and  the Pacific  Mortgage
which  exceeds  the  principal  amount  of  bonds  of  the  Twelfth  Series then
Outstanding and stating the  amount of such excess  and the principal amount  of
any  such Class "A" Bonds  to be cancelled) executed  by an Authorized Executive
Officer of the Company, the Trustee shall return to the corporate trustee  under
the  Utah Mortgage or corporate trustee under  the Pacific Mortgage, as the case
may be, for cancellation, a  principal amount of Class  "A" Bonds issued in  the
name  of and held by the Trustee with respect to bonds of the Twelfth Series not
to exceed the excess  of the principal  amount of such Class  "A" Bonds then  so
held  over the principal amount of bonds of the Twelfth Series then Outstanding.
Upon cancellation of any such principal  amount of Class "A" Bonds, the  Trustee
shall  receive from the  corporate trustee under the  Utah Mortgage or corporate
trustee under the Pacific Mortgage, as the case may be, a Class "A" Bond in  the
principal amount not so cancelled.

                                  ARTICLE III

THE COMPANY RESERVES THE RIGHT TO AMEND PROVISIONS REGARDING PROPERTIES EXCEPTED
                             FROM LIEN OF MORTGAGE

    SECTION  3.01. The Company reserves the  right, without any consent or other
action by holders of bonds  of the Eighth Series, or  any other series of  bonds
subsequently  created under  the Mortgage  (including the  bonds of  the Twelfth
Series), to make  such amendments  to the  Mortgage, as  heretofore amended  and
supplemented,  as shall be necessary in order  to amend the first proviso to the
granting clause  of  the  Mortgage,  which proviso  sets  forth  the  properties
excepted  from the Lien of the Mortgage, to add a new exception (10) which shall
read as follows:

                                       12

        "(10) allowances allocated to steam-electric generating plants owned  by
    the  Company or in which the Company  has interests, pursuant to Title IV of
    the Clean Air Act Amendments  of 1990, Pub. L.  101-549, Nov. 15, 1990,  104
    Stat.  2399,  42  USC  7651, et  seq.,  as  now in  effect  or  as hereafter
    supplemented or amended."

                                   ARTICLE IV

                            MISCELLANEOUS PROVISIONS

    SECTION 4.01. The right,  if any, of  the Company to  assert the defense  of
usury  against  a  holder or  holders  of bonds  of  the Twelfth  Series  or any
subsequent series shall be determined  only under the laws  of the State of  New
York.

    SECTION  4.02. The terms defined in the  Mortgage shall, for all purposes of
this Tenth Supplemental Indenture, have the meanings specified in the Mortgage.

    SECTION 4.03.  The  Trustee  hereby  accepts  the  trusts  hereby  declared,
provided, created or supplemented, and agrees to perform the same upon the terms
and  conditions herein and  in the Mortgage, as  hereby supplemented, set forth,
including the following:

    The Trustee shall  not be  responsible in any  manner whatsoever  for or  in
respect  of the validity or sufficiency  of this Tenth Supplemental Indenture or
for or in respect of  the recitals contained herein,  all of which recitals  are
made  by the  Company solely.  Each and  every term  and condition  contained in
Article XIX  of  the  Mortgage shall  apply  to  and form  part  of  this  Tenth
Supplemental Indenture with the same force and effect as if the same were herein
set  forth in full, with  such omissions, variations and  insertions, if any, as
may be appropriate  to make the  same conform  to the provisions  of this  Tenth
Supplemental Indenture.

    SECTION  4.04. Whenever in  this Tenth Supplemental  Indenture either of the
Company or the  Trustee is  named or  referred to,  this shall,  subject to  the
provisions  of Articles XVIII and XIX of  the Mortgage, be deemed to include the
successors and assigns of such party, and all the

                                       13

covenants and agreements in this Tenth Supplemental Indenture contained by or on
behalf of the  Company, or by  or on behalf  of the Trustee,  shall, subject  as
aforesaid,  bind  and  inure  to  the  respective  benefits  of  the  respective
successors and assigns of such parties, whether so expressed or not.

    SECTION 4.05. Nothing  in this  Tenth Supplemental  Indenture, expressed  or
implied,  is intended, or shall be construed to  confer upon, or to give to, any
person, firm or corporation,  other than the parties  hereto and the holders  of
the bonds and coupons outstanding under the Mortgage, any right, remedy or claim
under  or  by  reason of  this  Tenth  Supplemental Indenture  or  any covenant,
condition, stipulation,  promise or  agreement hereof,  and all  the  covenants,
conditions,  stipulations, promises  and agreements  in this  Tenth Supplemental
Indenture contained by or  on behalf of  the Company shall be  for the sole  and
exclusive  benefit of the parties hereto, and of the holders of the bonds and of
the coupons outstanding under the Mortgage.

    SECTION 4.06. This Tenth Supplemental Indenture shall be executed in several
counterparts, each  of  which  shall be  an  original  and all  of  which  shall
constitute but one and the same instrument.

                                   ARTICLE V

                        SPECIFIC DESCRIPTION OF PROPERTY
                        (Added to Pacific Power System)

    The  following described  properties of  the Company,  owned as  of the date
hereof, and used (or held for future development and use) in connection with the
Pacific Power Division of the Company's  electric utility systems, or for  other
purposes, as hereinafter indicated, respectively:

                              H--OFFICE BUILDINGS

    The  following office  and service  center of  the Company  in the  State of
Washington including the following described real property:

                                       14

H-48--YAKIMA OFFICE AND SERVICE CENTER

    In YAKIMA County, State of WASHINGTON

        H-48 ITEM: That part of the East 1/2 of the Southeast 1/4 of Section 17,
        Township 13 North, Range 19 East, W.M., lying northerly of the Northerly
        right-of-way  line  of  the  Burlington  Northern,  Inc.  Railroad  (now
        W.C.R.C.)  right-of-way as  conveyed by  deed recorded  in Volume  83 of
        Deeds, page 552;

        EXCEPTING THEREFROM the following:

        1) That portion  thereof conveyed  to Union Gap  Irrigation District  by
        deed dated April 6, 1916, and recorded in Volume 165 of Deeds, page 285,
        under Auditor's File No. 90399, described as all of the Northeast 1/4 of
        the Southeast 1/4 of said Section 17 lying North of a line 25 feet South
        of and parallel with the centerline of the Union Gap Ditch;

        2)  That portion thereof lying Westerly of the following described line:
        Commencing at a point on the South line of the tract of land conveyed to
        Union Gap Irrigation District by deed  recorded in Volume 165 of  Deeds,
        page 285, under Auditor's File No. 90399, which point is 23.8 feet South
        and  59 feet  North 89  DEG. 55'  East of  the Northwest  corner of said
        subdivision; thence North 89 DEG. 55' East along the South line of  said
        Union  Gap  Irrigation District  property 653.11  feet  to the  point of
        beginning of said described line; thence  South 00 DEG. 05' East to  the
        Northeasterly  right-of-way  line  of  said  Burlington  Northern,  Inc.
        Railroad right-of-way and the terminus of said described line;

        3) That portion thereof lying Easterly of the following described  line:
        Beginning at the point of intersection of the Northeasterly right-of-way
        line  of said Burlington Northern,  Inc. Railroad right-of-way, with the
        West line of the East  30.00 feet of the  Southeast 1/4 of said  Section
        17;  thence North 00  DEG. 32' 30"  West parallel with  the East line of
        said Section 1146.28 feet  to the P.C.  of a curve  to the left;  thence
        along  the arc of  a curve to the  left having a  radius of 925.00 feet,
        through a central angle of 30 DEG. 00';

                                       15

        thence North 30 DEG. 32' 30" West to the North line of the Southeast 1/4
        of said Section 17 and the  terminus of said described line (Parcel  No.
        191317-41001/Levy Code 385).

                                   ARTICLE VI

                        SPECIFIC DESCRIPTION OF PROPERTY
                          (Added to Utah Power System)

    The  following described  properties of  the Company,  owned as  of the date
hereof, and used (or held for future development and use) in connection with the
Utah Power Division  of the  Company's electric  utility systems,  or for  other
purposes, as hereinafter indicated, respectively:

SAND CREEK 46 KV SUBSTATION--PARCEL NUMBER: I8B00038

    Lands in BONNEVILLE County, State of IDAHO

        A  portion of the SE 1/4 SE 1/4,  Section 10, Township 2 North, Range 38
        East, of the Boise Meridian, described as beginning at a point 240  feet
        North  and 48 feet West, more or less, from the Southeast Corner of said
        Section 10; thence North 250 feet along a boundary line; thence West 150
        feet; thence  South 250  feet; thence  East  150 feet  to the  point  of
        beginning.

        TOGETHER  WITH an Easement and Right-of-Way  described as beginning at a
        point 240 feet North and 198 feet West, more or less, from the Southeast
        corner of said Section 10; thence North 27 feet; thence West 300 feet to
        the East boundary  line of Richard  Avenue; thence South  27 feet  along
        said East boundary line; thence East 300 feet to the point of beginning.

TOOELE-DUGWAY 46 KV REGULATOR SITE--PARCEL NUMBER: UT00028

    Lands in TOOELE County, State of UTAH

        Beginning at a point on an existing right-of-way fence, said point being
        North  89 DEG.  22' 38"  East along Section  line 820.24  feet and South
        2417.15 feet from the Northwest corner of Section 18, Township 5  South,
        Range 5 West, Salt Lake Base and Meridian;

                                       16

        and  running thence  South 6 DEG.  20' 58" East  along said right-of-way
        fence 100.00 feet; thence South 83 DEG. 39' 02" West 100.00 feet; thence
        North 6 DEG. 20' 58" West 100.00 feet; thence North 83 DEG. 39' 02" East
        100.00 feet to the point of beginning.

NEW HARMONY 46 KV SUBSTATION--PARCEL NUMBER: UI00045

    Lands in IRON County, State of UTAH

        A tract of  land situate  in the  S 1/2  of the  SE 1/4  of Section  17,
        Township  38  South, Range  12 West,  Salt  Lake Meridian,  described as
        beginning South 89 DEG. 43' 36" East 1090.73 feet along the section line
        and NORTH 964.94 feet from the south one quarter corner of said  Section
        17;  thence North 65 DEG. 08' 25" East 54.12 feet, North 11 DEG. 15' 29"
        West 65.05 feet, North 71  DEG. 44' 47" West  69.92 feet, North 38  DEG.
        23'  55" East 143.93  feet, and North  46 DEG. 23'  39" East 203.42 feet
        along the easterly top of bank  of an existing wash, thence NORTH  86.36
        feet,  more or less,  to a north boundary  fence; thence EASTERLY 422.24
        feet, more or less, along said fence to the easterly boundary line, said
        easterly boundary line  also being  the westerly  right of  way line  of
        Interstate 15, thence Southwesterly along said right of way line and the
        arc of a 1818.08 foot radius curve to the right 233.59 feet (chord bears
        South  21 DEG.  39' 47" West  233.43 feet),  South 25 DEG.  19' 40" West
        203.82 feet, and southwesterly  along the arc of  a 1238.28 foot  radius
        curve  to the right 58.3706 feet (chord bears South 23 DEG. 58' 33" West
        58.3652 feet), thence  North 89 DEG.  43' 36" West,  431.85 feet to  the
        point of beginning.

COTTONWOOD DISTRICT GARAGE--PARCEL NUMBER: US01016

    Lands in SALT LAKE County, State of UTAH

        Beginning  at a point  which is North  579.21 feet and  West 279.96 feet
        from the Southeast corner of Section 26, Township 2 South, Range 1 West,
        SLB&M; and running thence North 89 DEG. 53' 21" West 174.00 feet; thence
        North 00 DEG. 21' 20" West 72.00 feet; thence South 89 DEG. 53' 21" East
        174.00 feet; thence South 00 DEG. 21'  20" East 72.00 feet to the  point
        of beginning.

                                       17

    IN  WITNESS WHEREOF, PACIFICORP has caused its corporate name to be hereunto
affixed, and this instrument to be signed and sealed by an Authorized  Executive
Officer  of  the  Company, and  its  corporate seal  to  be attested  to  by its
Secretary or one of its Assistant Secretaries for and in its behalf, and  Morgan
Guaranty  Trust Company Of New York has caused its corporate name to be hereunto
affixed, and  this  instrument to  be  signed and  sealed  by one  of  its  Vice
Presidents or one of its Assistant Vice Presidents, and its corporate seal to be
attested  to by one of  its Assistant Secretaries, and  Chemical Bank has caused
its corporate name to be hereunto affixed, and this instrument to be signed  and
sealed  by one of its  Vice Presidents or one  of its Assistant Vice Presidents,
and its corporate seal to  be attested to by one  of its Senior Trust  Officers,
all as of the day and year first above written.

[SEAL]                               PACIFICORP

                                     By      RICHARD T. O'BRIEN
                                       -------------------------------
                                                Vice President
Attest:

         JOHN M. SCHWEITZER
----------------------------------
       Assistant Secretary



                                       18

                                       MORGAN GUARANTY TRUST
                                       COMPANY OF NEW YORK
[SEAL]                                 as Resigning Trustee

                                       By        PETER VITELLIO
                                          -------------------------------
                                                 Vice President
Attest:

         TAMARA FELICETTI
----------------------------------
       Assistant Secretary

                                       CHEMICAL BANK
                                       as Successor Trustee

                                       By          F.J. GRIPPO
                                          -------------------------------
                                                 Vice President
Attest:

              M. KATZ
----------------------------------
        Senior Trust Officer

                                       19

STATE OF OREGON
COUNTY OF MULTNOMAH      ss.:

    On this 7th day of September, 1994, before me, SHERYL LEE STRATTON, a Notary
Public  in and for the  State of Oregon, personally  appeared RICHARD T. O'BRIEN
and JOHN M.  SCHWEITZER, known to  me to be  a Vice President  and an  Assistant
Secretary,  respectively, of PACIFICORP,  an Oregon corporation,  who being duly
sworn, stated that the seal affixed to the foregoing instrument is the corporate
seal of  said corporation  and  acknowledged this  instrument  to be  the  free,
voluntary  and in all respects duly and properly authorized act and deed of said
corporation.

    IN WITNESS WHEREOF, I have  hereunto set my hand  and official seal the  day
and year first above written.

                                             SHERYL LEE STRATTON
                                     ----------------------------------
                                     My commission expires: May 25, 1996
[SEAL]                                  Residing at: Portland, Oregon

STATE OF NEW YORK
COUNTY OF NEW YORK       ss.:

    On  this 1st day  of September, 1994,  before me, JOHN  MIECHKOWSKI a Notary
Public in and for the State of New York, personally appeared PETER VITELLIO  and
TAMARA  FELICETTI, known to me  to be a Vice  President and Assistant Secretary,
respectively, of  MORGAN  GUARANTY  TRUST  COMPANY  OF  NEW  YORK,  a  New  York
corporation, who being duly sworn, stated that the seal affixed to the foregoing
instrument  is  the corporate  seal of  said  corporation and  acknowledged this
instrument to  be the  free, voluntary  and in  all respects  duly and  properly
authorized act and deed of said corporation.

    IN  WITNESS WHEREOF, I have  hereunto set my hand  and official seal the day
and year first above written.

                                              JOHN MIECHKOWSKI
                                     ----------------------------------
[SEAL]                                Notary Public, State of New York
                                                No. 30-4893319
                                          Qualified in Nassau County
                                      Commission expires: May 18, 1995


                                       20

STATE OF NEW YORK
COUNTY OF NEW YORK       ss.:

    On this 2nd day of September, 1994,  before me, EMILY FAYAN a Notary  Public
in  and for the State of New York,  personally appeared F.J. GRIPPO and M. KATZ,
known to me to be a Vice President and a Senior Trust Officer, respectively,  of
CHEMICAL  BANK, a New  York corporation, who  being duly sworn,  stated that the
seal affixed  to  the  foregoing  instrument  is  the  corporate  seal  of  said
corporation  and acknowledged this  instrument to be the  free, voluntary and in
all respects duly and properly authorized act and deed of said corporation.

    IN WITNESS WHEREOF, I have  hereunto set my hand  and official seal the  day
and year first above written.

                                                 EMILY FAYAN
                                     ----------------------------------
[SEAL]                                Notary Public, State of New York
                                                 No. 24-4737006
                                           Qualified in Kings County
                                     Commission expires December 31, 1995