PUGET SOUND ENERGY INC
424B3, 2000-11-02
ELECTRIC SERVICES
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<PAGE>

                                       Registration Statement File No. 333-47302
                                                Filed Pursuant to Rule 424(b)(3)
PROSPECTUS SUPPLEMENT
(To Prospectus Dated October 30, 2000)
                                                    [LOGO OF PUGET SOUND ENERGY]
                                  $500,000,000

                            PUGET SOUND ENERGY, INC.

                       Senior Medium-Term Notes, Series C
                   Due Nine Months or More From Date of Issue

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

  Terms specified in pricing supplements. From time to time, we plan to offer
and sell senior notes with various terms. The final terms of each senior note
will be specified in a pricing supplement at the time the senior notes are
issued. The pricing supplements will designate the specific terms of each issue
of the senior notes, including the following terms:

  .  aggregate principal         .  interest rate per annum and interest
     amount;                        payment dates;

  .  maturity date;              .  optional redemption or repayment terms; and

  .  form of notes               .  minimum denominations (if other than $1,000
     (either book entry or          or integral multiples thereof).
     certificate in definitive
     form);

  Security. Each senior note will be initially secured by our first mortgage
bonds issued under our electric utility mortgage. However, after the date that
all our first mortgage bonds issued and outstanding under our electric utility
mortgage indenture and, if applicable, our gas utility mortgage indenture have
been retired, the senior notes will, at our option, become our unsecured
obligations or be secured by substitute first mortgage bonds issued under a
mortgage indenture other than our electric utility mortgage indenture or our
gas utility mortgage indenture.

<TABLE>
<CAPTION>
                    Public
                   Offering     Agent's Discounts   Proceeds, before expenses,
                    Price        and Commissions       to Puget Sound Energy
                 ------------ --------------------- ---------------------------
<S>              <C>          <C>                   <C>
Per senior
 note...........     100%         .125% - .875%          99.875% - 99.125%
Total........... $500,000,000 $625,000 - $4,375,000 $499,375,000 - $495,625,000
</TABLE>

  Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if
this prospectus supplement, the accompanying prospectus or any pricing
supplement is truthful or complete. Any representation to the contrary is a
criminal offense.

  We may sell senior notes to the agents referred to below and to other agents
listed in an applicable pricing supplement as principal for resale at varying
or fixed offering prices or through the agents as agent using their reasonable
efforts on our behalf. We may also sell senior notes without the assistance of
agents (whether acting as principal or as agent). Unless we specify otherwise
in a pricing supplement, the senior notes will not be listed on any securities
exchange.

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

Merrill Lynch & Co.                                         Salomon Smith Barney

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

          The date of this prospectus supplement is November 1, 2000.
<PAGE>

                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
       Prospectus Supplement         Page                Prospectus                Page
       ---------------------         ----                ----------                ----
<S>                                  <C>    <C>                                    <C>
Puget Sound Energy.................  S-2    Where You Can Find More Information..    3
Ratios of Earnings to Fixed                 Puget Sound Energy...................    4
 Charges...........................  S-3    Puget Sound Energy Capital Trust II..    4
Description of Senior Medium-Term           Use of Proceeds......................    6
 Notes, Series C...................  S-3    Ratios of Earnings to Fixed Charges..    6
Supplemental Plan of Distribution..  S-7    Description of Securities............    7
                                            Plan of Distribution.................   27
                                            Legal Opinions.......................   29
                                            Experts..............................   29
</TABLE>

  You should rely only on the information contained or incorporated by
reference in this prospectus supplement, the accompanying prospectus and any
pricing supplement, or on the information to which we have referred you.
Neither we nor any agent has authorized anyone to provide you with information
that is different. This prospectus supplement, the accompanying prospectus and
any pricing supplement may only be used where it is legal to sell these
securities. The information in this prospectus supplement, the accompanying
prospectus and any pricing supplement is accurate only as of the date on the
front cover of the applicable pricing supplement.

                               PUGET SOUND ENERGY

  Puget Sound Energy, Inc. is an investor-owned public utility incorporated in
the state of Washington furnishing electric and gas service in a territory
covering approximately 6,000 square miles, principally in the Puget Sound
region of Washington state.

  At September 30, 2000, we had approximately 918,500 electric customers,
consisting of 813,700 residential, 99,100 commercial, 4,100 industrial and
1,600 other customers, and approximately 582,400 gas customers, consisting of
534,000 residential, 45,300 commercial, 3,000 industrial and 100 other
customers. For the 12 months ended September 30, 2000, we added approximately
15,400 electric customers and approximately 22,600 gas customers, representing
annualized growth rates of 1.7% and 4.0%, respectively. During the 12 months
ended September 30, 2000, our retail revenues from electric utility operations
were derived 45% from residential customers, 36% from commercial customers, 18%
from industrial customers and 1% from other customers. Our retail revenues from
gas utility operations were derived 60% from residential customers, 30% from
commercial customers, 6% from industrial customers, 2% from transportation
customers and 2% from other customers. During this period, our largest customer
accounted for 1.8% of our utility operating revenues.

  Gross electric utility plant at September 30, 2000, was approximately $4.0
billion which consisted of 46% distribution, 28% generation, 15% transmission
and 11% general plant and other. Gross gas utility plant at September 30, 2000,
was approximately $1.4 billion which consisted of 83% distribution, 5%
transmission and 12% general plant and other.

  At September 30, 2000, we had approximately 2,900 aggregate full-time
equivalent utility employees. Our executive office is located at 411-108th
Avenue, N.E., Bellevue, Washington 98004-5515, and our telephone number is
(425) 454-6363.

                                      S-2
<PAGE>

                      RATIOS OF EARNINGS TO FIXED CHARGES

  The following table sets forth our ratios of earnings to fixed charges for
the respective periods indicated:

<TABLE>
<CAPTION>
                                  Twelve Months
                                      Ended
                                  September 30,    Years Ended December 31,
                                  ------------- ------------------------------
                                   2000   1999  1999 1998 1997(1) 1996(1) 1995
                                  ------ ------ ---- ---- ------- ------- ----
<S>                               <C>    <C>    <C>  <C>  <C>     <C>     <C>
Ratio of earnings to fixed
 charges(2)(3)...................   2.6x   2.7x 2.7x 2.8x  2.5x    3.1x   2.6x
</TABLE>
--------
(1)  The ratios for the years ended December 31, 1997 and 1996 include charges
     incurred in connection with Puget's merger with Washington Energy Company
     and its principal subsidiary, Washington Natural Gas Company. Had such
     charges been excluded from earnings, the ratios of earnings to fixed
     charges for such periods would have been 2.9x and 3.2x, respectively.
(2)  As a result of the merger, each of Puget's ratios reflects the combined
     operations of Puget and the Washington Energy Company. Because the
     Washington Energy Company's fiscal year ended September 30, the combined
     ratios for the two years ended December 31, 1996 reflect the fiscal years
     ended December 31 for Puget and September 30 for the Washington Energy
     Company.
(3)  For purposes of computing the ratios of earnings to fixed charges,
     earnings represent income from continuing operations before extraordinary
     items and cumulative effect of changes in accounting principles plus
     applicable income taxes and fixed charges. Fixed charges include all
     interest expense and the proportion deemed representative of the interest
     factor of rent expense.

               DESCRIPTION OF SENIOR MEDIUM-TERM NOTES, SERIES C

  The following description of the senior notes supplements the more general
description of the senior notes that appears in the prospectus. If there are
any inconsistencies between the information in this section and the information
in the prospectus, the information in this section controls. You should read
this section together with the section called "Description of Securities" in
the prospectus. The senior notes will be issued as a separate series of senior
notes under the senior note indenture, dated as of December 1, 1997, as
supplemented by a third supplemental indenture dated as of October 1, 2000,
between Puget and the senior note trustee. Provisions of the senior note
indenture are more fully described in the section called "Description of
Securities" in the prospectus. We qualify the description of the senior notes
by reference to the senior note indenture and the third supplemental indenture.
The following description of the senior notes will apply to each senior note
offered hereby unless otherwise specified in the pricing supplement.

General

  The senior notes we may offer under this prospectus supplement are limited to
an aggregate principal amount of $500,000,000. Such aggregate principal amount
may be reduced from time to time as a result of a sale by the Company of other
Securities as described in the accompanying prospectus. The senior note
indenture does not limit the aggregate principal amount of senior notes that we
may issue, and we may issue senior notes from time to time in one or more
series up to the aggregate initial offering price from time to time authorized
for each series. As of the date of this prospectus supplement, we have issued
$1,000,000,000 aggregate principal amount of senior notes under the senior note
indenture, all of which remain outstanding. We may, from time to time, without
the consent of the holders of the senior notes, provide for the issuance of
senior notes under the senior note indenture in addition to the $500,000,000
aggregate principal amount of senior notes offered hereby.

  We will offer the senior notes on a continuous basis with maturities of nine
months or more from the date of issue, as selected by the purchaser and agreed
to by us. Unless otherwise indicated in the applicable pricing supplement, the
senior notes will be denominated in United States currency in minimum
denominations of

                                      S-3
<PAGE>

$1,000 and integral multiples thereof. In addition, the pricing supplement
applicable to each issue of senior notes will specify the following terms:

  .  the designation and aggregate principal amount of the issue of senior
     notes;

  .  the date on which the issue of senior notes will mature;

  .  the interest rate or rates, or method of calculation of such rate or
     rates, on the issue of senior notes, and the date from which interest
     will accrue;

  .  the interest payment dates on which interest will be payable;

  .  the record dates for payments of interest;

  .  any redemption terms;

  .  the period or periods within which, the price or prices at which and the
     terms and conditions upon which the issue of senior notes may be repaid,
     in whole or in part, at the option of the holder; and

  .  other specific terms applicable to the issue of senior notes.

  Interest rates applicable to the senior notes may differ depending upon a
number of factors, including the aggregate principal amount of senior notes
purchased in any single transaction. Unless otherwise indicated in the
applicable pricing supplement, interest on the senior notes shall be
calculated on the basis of a 360-day year of twelve 30-day months and shall be
computed at a fixed rate until the maturity of the senior notes.

  Unless otherwise indicated in the applicable pricing supplement, there are
no provisions in the senior note indenture or the senior notes that require us
to redeem the senior notes or that otherwise protect the holders in the event
that we incur substantial additional indebtedness (except for certain
restrictions on our ability to create, assume or incur certain liens or to
enter into certain financing transactions after the release date, as described
in the sections called "Description of Securities--Senior Notes--Certain
Covenants of Puget--Limitations on Liens" and "--Limitations on Sale and
Lease-Back Transactions" in the accompanying prospectus), whether or not in
connection with a change in control of Puget. However, any change in control
transaction that involves the incurrence of long-term indebtedness by us would
require approval of state utility regulatory authorities and, possibly, of
federal utility regulatory authorities.

  Unless otherwise indicated in the applicable pricing supplement, in any case
where any interest payment date or the date of maturity of the senior notes or
the date fixed for redemption of the senior notes is not a business day, then
payment of such principal or any premium or interest need not be made on such
date but may be made on the next succeeding business day with the same force
and effect as if made on the dates fixed for such payments, and, assuming
timely payment thereof, no interest shall accrue for the period from and after
such interest payment date or the date on which the principal of the senior
notes is required to be paid. The term "business day" means each Monday,
Tuesday, Wednesday, Thursday and Friday that is not a day on which banking
institutions or trust companies in the Borough of Manhattan, The City of New
York, or in the city where the corporate trust office of the senior note
trustee is located, are obligated or authorized by law or executive order to
close.

Security

  At the time we issue any of the senior notes prior to the release date (as
described below), we will simultaneously deliver to the senior note trustee,
as security for the senior notes, First Mortgage Bonds, Pledged Series B,
issued under our electric utility mortgage indenture. The pledged electric
utility mortgage bonds will have the same interest rate, interest payment
dates, stated maturity date and redemption provisions, and will be in the same
aggregate principal amount, as the senior notes then issued.

  As provided in the senior note indenture and the supplemental indenture to
the electric utility mortgage which sets forth the terms of the pledged
electric utility mortgage bonds, our obligation to make payments with respect
to the principal of, premium or interest on the pledged electric utility
mortgage bonds will be fully or

                                      S-4
<PAGE>

partially, as the case may be, satisfied and discharged to the extent that, at
the time that any such payment is due, the then due principal of, premium or
interest on the senior notes issued simultaneously with such pledged electric
utility mortgage bonds are fully or partially paid or we have deposited with
the senior note trustee pursuant to the senior note indenture sufficient
available funds to fully or partially pay the then due principal of, premium,
if any, or interest on such senior notes.

  You should read the section called "Description of Securities--Senior Notes--
Security; Release Date" in the accompanying prospectus for a description of the
circumstances under which all or part of the pledged electric utility mortgage
bonds will cease to be held by the senior note trustee as security for the
senior notes. As explained in the prospectus, the senior notes will cease to be
secured by the pledged electric utility mortgage bonds on the date that all of
our mortgage bonds issued and outstanding under our electric utility mortgage
indenture and our gas utility mortgage indenture, other than first mortgage
bonds securing senior notes, have been retired. After that release date, the
senior notes will, at our option either (a) become our unsecured general
obligations or (b) be secured by substitute first mortgage bonds issued under a
mortgage indenture other than our electric utility mortgage indenture or our
gas utility mortgage indenture. If we elect not to have the senior notes become
unsecured on the release date, we will simultaneously with the issuance of
senior notes after the release date issue and deliver to the senior note
trustee, as security for such senior notes, substitute first mortgage bonds.
The substituted first mortgage bonds will have the same interest rate, interest
payment dates, stated maturity date and redemption provisions, and will be in
the same aggregate principal amount, as the senior notes then issued.

  In the event we elect to have the senior notes become unsecured on the
release date, our ability to create, assume or incur certain liens or to enter
into certain financing transactions will be restricted. For a description of
those restrictions, you should read the sections called "Description of
Securities--Senior Notes--Certain Covenants of Puget--Limitations on Liens" and
"--Limitations on Sale and Lease-Back Transactions" in the accompanying
prospectus.

Book-Entry Procedures

  Unless senior notes in certificated form are issued, the senior notes will be
represented by one or more fully registered global certificates. Each global
note will be deposited with, or on behalf of, The Depository Trust Company, and
registered in its name or in the name of Cede & Co., its nominee. No holder of
a senior note initially issued as a global certificate will be entitled to
receive a senior note in certificated form, except as set forth below.

  DTC has advised us as follows:

  . DTC is:

   -- a limited purpose trust company organized under the laws of the State
    of New York,

   -- 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 Section 17A of the
    Securities Exchange Act.

  . DTC was created to hold securities for DTC participants and to facilitate
    the clearance and settlement of securities transactions between DTC
    participants through electronic book-entries, thereby eliminating the
    need for physical movement of certificates.

  . DTC participants include securities brokers and dealers, banks, trust
    companies and clearing corporations.

  . Access to DTC's book-entry system is also available to others, such as
    banks, brokers, dealers and trust companies that clear through or
    maintain a custodial relationship with a participant, either directly or
    indirectly.

                                      S-5
<PAGE>

  Holders that are not DTC participants but desire to purchase, sell or
otherwise transfer ownership of, or other interests in, the senior notes may do
so only through DTC participants. In addition, holders of the senior notes will
receive all distributions of principal and interest from the senior note
trustee through DTC participants. Under the rules, regulations and procedures
creating and affecting DTC and its operation, DTC is required to make book-
entry transfers of senior notes among DTC participants on whose behalf it acts
and to receive and transmit distributions of principal of, and interest on, the
senior notes. Under the book-entry system, holders of senior notes may
experience some delay in receipt of payments, since such payments will be
forwarded by the senior note trustee to Cede, as nominee for DTC, and DTC in
turn will forward the payments to the appropriate DTC participants.

  The DTC participants will be responsible for distributions to holders of
senior notes and those distributions will be made in accordance with customary
industry practices. Although holders of senior notes will not have possession
of the senior notes, the rules of DTC provide a mechanism by which those
holders will receive payments and will be able to transfer their interests.
Although DTC participants are expected to convey the rights represented by
their interests in any global security to the related holders, because DTC can
only act on behalf of DTC participants, the ability of holders of senior notes
to pledge the senior notes to persons or entities that are not DTC participants
or to otherwise act with respect to such senior notes, may be limited due to
the lack of physical certificates for such senior notes.

  Neither Puget nor the senior note trustee nor any agent of either of them
will be responsible or liable for any aspect of the records relating to, or
payments made on account of, beneficial ownership interests in the senior notes
or for supervising or reviewing any records relating to such beneficial
ownership interests. Since the only "holder of senior notes," for purposes of
the senior note indenture, will be Cede, as nominee of DTC, holders of senior
notes will not be recognized by the senior note trustee as "holders of senior
notes," and holders of senior notes will be permitted to exercise the rights of
holders only indirectly through DTC and DTC participants. DTC has advised us
that it will take any action permitted to be taken by a holder of senior notes
under the senior note indenture only at the direction of one or more DTC
participants to whose accounts with DTC the related senior notes are credited.

  All payments we make to the senior note trustee will be in immediately
available funds and will be passed through to DTC in immediately available
funds.

  We will issue physical certificates to holders of a global security, or their
nominees, if:

  . DTC advises the senior note trustee in writing that it is no longer
    willing, able or eligible to discharge properly its responsibilities as
    depository and we are unable to locate a qualified successor, or

  . we decide in our sole discretion to terminate the book-entry system
    through DTC.

  In such event, the senior note trustee will notify all holders of senior
notes through DTC participants of the availability of such certificated senior
notes. Upon surrender by DTC of the definitive global note representing the
senior notes and receipt of instructions for reregistration, the senior note
trustee will reissue the senior notes in certificated form to holders or their
nominees.

  Senior notes in certificated form will be freely transferable and
exchangeable at the office of the senior note trustee upon compliance with the
requirements set forth in the senior note indenture. There will be no service
charge imposed for any registration of transfer or exchange, but payment of a
sum sufficient to cover any tax or other governmental charge may be required.

                                      S-6
<PAGE>

                       SUPPLEMENTAL PLAN OF DISTRIBUTION

  We are offering the senior notes on a continuous basis to or through Merrill
Lynch & Co., Merrill Lynch, Pierce, Fenner & Smith Incorporated, Salomon Smith
Barney Inc. and other agents named in the applicable pricing supplement. The
agents, individually or in a syndicate, may purchase senior notes, as
principal, from us from time to time for resale to investors and other
purchasers at varying prices relating to prevailing market prices at the time
of resale as determined by the applicable agent or, if so specified in the
applicable pricing supplement, for resale at a fixed offering price. If agreed
to by us and an agent, such agent will utilize its reasonable efforts to
solicit offers to purchase the senior notes at 100% of the principal amount of
the senior notes, unless otherwise specified in the applicable pricing
supplement. We will pay each agent a commission of .125% to .875% of the
principal amount of each senior note sold through such agent, depending upon
the maturity of the senior note. Commissions with respect to senior notes with
stated maturities in excess of 30 years that are sold through such agent will
be negotiated between us and such agent at the time of such sale. In addition,
the expenses incurred by us in connection with the offering and sale of the
senior notes, including reimbursement of certain of the agents' expenses, are
currently estimated to be $600,000.

  Unless otherwise specified in the applicable pricing supplement, any senior
note sold to an agent as principal will be purchased by such agent at a price
equal to 100% of the principal amount thereof less a percentage of the
principal amount equal to the commission applicable to an agency sale of a
senior note of identical maturity. An agent may sell senior notes it has
purchased from us as principal to certain dealers less a concession equal to
all or a portion of the discount in connection with such purchase. Such agent
may allow, and such dealers may reallow, a discount to certain other dealers.
After the initial offering of senior notes, the offering price (in the case of
notes to be resold on a fixed offering price basis), the concession and
reallowances may be changed. We reserve the right to withdraw, cancel or modify
the offer made hereby without notice and may reject offers in whole or in part
(whether placed directly with us or through an agent). Each agent will have the
right in its discretion reasonably exercised, to reject in whole or in part any
offer to purchase senior notes received by it on an agency basis.

  We may authorize the agents to solicit offers by certain institutions to
purchase the senior notes from us at the public offering price set forth in the
applicable pricing supplement pursuant to delayed delivery contracts providing
for payment and delivery on the future date or dates stated in such pricing
supplement. Each delayed delivery contract will be for an amount not less than,
and the aggregate principal amount of the senior notes sold pursuant to the
delayed delivery contracts shall be not less nor more than, the respective
amounts stated in such pricing supplement. Institutions with whom the delayed
delivery contracts, when authorized, may be made include commercial and savings
banks, insurance companies, pension funds, investment companies, educational
and charitable institutions, and other institutions, but will in all cases be
subject to our approval. The delayed delivery contracts will not be subject to
any conditions except the purchase by an institution of the senior notes
covered by its delayed delivery contract shall not at the time of delivery be
prohibited under the laws of any jurisdiction in the United States to which
such institution is subject.

  Unless otherwise specified in the pricing supplement, payment of the purchase
price of the senior notes will be required to be made in immediately available
funds, in U.S. dollars and in New York, New York on the date of settlement.

  Upon issuance, the senior notes will not have an established trading market.
Unless otherwise specified in the pricing supplement, the senior notes will not
be listed on any securities exchange. The agents may from time to time purchase
and sell senior notes in the secondary market, but the agents are not obligated
to do so, and there can be no assurance that there will be a secondary market
for the senior notes or that there will be liquidity in the secondary market if
one develops. From time to time, the agents may make a market in the senior
notes, but the agents are not obligated to do so and may discontinue any
market-making activity at any time.


                                      S-7
<PAGE>

  In connection with an offering of senior notes purchased by one or more
agents as principal on a fixed offering price basis, such agent or agents will
be permitted to engage in certain transactions that stabilize the price of
senior notes. Such transactions may consist of bids or purchases for the
purpose of pegging, fixing or maintaining the price of senior notes. If the
agent or agents sells or sell senior notes in an aggregate principal amount
exceeding that stated in the pricing supplement, such agent or agents may
reduce that short position by purchasing senior notes in the open market. In
general, purchases of senior notes for the purpose of stabilization or to
reduce a short position could cause the price of senior notes to be higher than
it might be in the absence of such purchases.

  Neither we nor any of the agents make any representation or prediction as to
the direction or magnitude of any effect that the transactions described in the
immediately preceding paragraph may have on the price of senior notes. In
addition, neither we nor any of the agents makes any representation that the
agents will engage in any such transactions or that such transactions, once
commenced, will not be discontinued without notice.

  The agents may be deemed to be "underwriters" within the meaning of the
Securities Act of 1933. We have agreed to indemnify the agents against certain
civil liabilities, including liabilities under the Securities Act, or to
contribute to payments the agents may be required to make in respect thereof.
We have agreed to reimburse the agents for certain other expenses.

  In the ordinary course of business, the agents and their affiliates have
engaged in and may in the future engage in transactions with and perform
services for us.

  From time to time, we may sell other senior notes described in the
accompanying prospectus, and the amount of senior notes offered hereby is
subject to reduction as a result of such sales.

                                      S-8
<PAGE>

PROSPECTUS

                            PUGET SOUND ENERGY, INC.

                                  Senior Notes
                            Subordinated Debentures
                                   Guarantees

                                      and

                      PUGET SOUND ENERGY CAPITAL TRUST II

                           Trust Preferred Securities
                  Guaranteed to the Extent Set Forth Herein By
                            Puget Sound Energy, Inc.

                          Offering Price: $500,000,000

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

  Puget may offer, on one or more occasions:

  .  secured senior debt or unsecured subordinated debt securities consisting
     of notes, debentures and other unsecured evidence of indebtedness, and

  .  guarantees of Puget Sound Energy with respect to trust preferred
     securities of Puget Sound Energy Capital Trust II.

  Puget Sound Energy Capital Trust II, which is a Delaware business trust, may
offer, on one or more occasions:

  .  trust preferred securities, which represent preferred undivided
     beneficial interests in the assets of Puget Sound Energy Capital Trust
     II.

  For each type of security listed above, the amount, price and terms will be
determined at or prior to the time of sale.

  Each time we offer any of these securities, we will set forth the specific
terms of these securities in one or more supplements to this prospectus. The
prospectus supplement or supplements also will set forth the names of any
underwriters, dealers or agents involved in the offering of the securities, the
compensation of these parties and any other special terms of the offering and
sale. You should read carefully this prospectus and the accompanying prospectus
supplement or supplements before you invest.

  This prospectus may not be used to consummate sales of any of these
securities unless accompanied by a prospectus supplement.

  Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
accuracy or adequacy of this prospectus. Any representation to the contrary is
a criminal offense.

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

                The date of this prospectus is October 30, 2000.
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Where You Can Find More Information........................................   3

Puget Sound Energy.........................................................   4

Puget Sound Energy Capital Trust II........................................   4

Use of Proceeds............................................................   6

Ratios of Earnings to Fixed Charges........................................   6

Description of Securities..................................................   7

Plan of Distribution.......................................................  27

Legal Opinions.............................................................  29

Experts....................................................................  29
</TABLE>

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

  In this prospectus, "Puget" refers to Puget Sound Energy, Inc. and the
"trust" refers to Puget Sound Energy Capital Trust II. "We," "us" and "our"
refer to Puget Sound Energy, Inc. and Puget Sound Energy Capital Trust II.

  You should rely only on the information contained or incorporated by
reference in this prospectus or any prospectus supplement. We have not
authorized anyone to provide you with different information, and if anyone does
provide you with different or inconsistent information, you should not rely on
it. You should not assume that the information in this prospectus or any
prospectus supplement is accurate after the date on the front cover of the
applicable document. We are not making an offer to sell these securities in any
jurisdiction in which the offer or sale is not permitted.
<PAGE>

                      WHERE YOU CAN FIND MORE INFORMATION

  Puget files reports, proxy statements and other information with the
Securities and Exchange Commission. These SEC filings are available over the
Internet at the SEC's web site at http://www.sec.gov. You may also read and
copy any document Puget files at the SEC's public reference room at 450 Fifth
Street N.W., Room 1024, Washington, D.C. 20549. Please call the SEC at 1-800-
SEC-0330 for more information on the public reference rooms and their copy
charges. You may also inspect Puget's SEC reports and other information at the
New York Stock Exchange, 20 Broad Street, New York, New York 10005.

  In connection with this offering, we have filed with the SEC a registration
statement on Form S-3 under the Securities Act of 1933. As permitted by SEC
rules, this prospectus omits certain information included in the registration
statement. For a more complete understanding of the securities we may offer,
you should refer to the registration statement, including its exhibits.

  The SEC allows us to "incorporate by reference" into this prospectus the
information we file separately with it, which means we may disclose important
information by referring you to those other documents. The information we
incorporate by reference is considered to be part of this prospectus, except
for any information superseded by information in this prospectus. This
prospectus incorporates by reference the documents set forth below that Puget
has filed previously with the SEC. These documents contain important
information about Puget and its finances.

<TABLE>
<CAPTION>
     SEC Filings (File No. 1-4393)                  Period/Date
     -----------------------------                  -----------
     <S>                                            <C>
     Annual Report on Form 10-K.................... Year ended December 31, 1999
     Quarterly Reports on Form 10-Q................ Quarter ended March 31, 2000
                                                    Quarter ended June 30, 2000
     Current Report on Form 8-K.................... Filed February 11, 2000
                                                    Filed May 25, 2000
                                                    Filed July 3, 2000
                                                    Filed July 21, 2000
</TABLE>

  The documents filed by Puget with the SEC pursuant to Sections 13(a), 13(c),
14 and 15 of the Securities Exchange Act of 1934 after the date of this
prospectus are also incorporated by reference into this prospectus.

  You may request a copy of these filings at no cost by writing or telephoning
Puget at the following address:

  Investor Relations
  Puget Sound Energy, Inc.
  411-108th Avenue N.E.
  Bellevue, Washington 98004-5515
  (425) 454-6363

  You should rely only on the information contained or incorporated by
reference in this prospectus and the accompanying prospectus supplement. Puget
has not authorized anyone to provide you with information that is different
from this information.

  Separate financial statements of the trust have not been included in this
prospectus. Puget and the trust do not consider such financial statements to be
helpful because:

  .  Puget beneficially owns directly or indirectly all of the undivided
     beneficial interests in the assets of the trust (other than the
     beneficial interests represented by the trust preferred securities). See
     "Puget Sound Energy Capital Trust," "Description of Securities--Trust
     Preferred Securities" and "Description of Securities--The Guarantee";

  .  Puget will guarantee the trust preferred securities such that the
     holders of the trust preferred securities, with respect to the payment
     of distributions and amounts upon liquidation, dissolution and winding-
     up, are at least in the same position with regard to the assets of Puget
     as a preferred shareholder of Puget;

                                       3
<PAGE>

  .  in future filings under the Securities Exchange Act of 1934, an audited
     footnote to Puget's annual financial statements will state that the
     trust is wholly owned by Puget, that the sole assets of the trust are
     the subordinated debentures of Puget having a specified total principal
     amount, and that, considered together, the back-up undertakings,
     including the guarantees, constitute a full and unconditional guarantee
     by Puget of the trust's obligations under the trust preferred securities
     issued by the trust; and

  .  the trust is a newly created special purpose entity, has no operating
     history, no independent operations and is not engaged in, and does not
     propose to engage in, any activity other than as described under "Puget
     Sound Energy Capital Trust."

                               PUGET SOUND ENERGY

  Puget Sound Energy, Inc., a Washington corporation, is an investor-owned
public utility, furnishing electric and gas service in a territory covering
approximately 6,000 square miles, principally in the Puget Sound region of
Washington state.

  As of June 30, 2000, Puget had approximately 915,000 electric customers,
consisting of 810,200 residential, 99,200 commercial, 4,100 industrial and
approximately 1,500 other electric customers and approximately 580,000 gas
customers, consisting of 532,000 residential, 45,500 commercial, 3,000
industrial and approximately 100 gas transportation customers. For the 12
months ended June 30, 2000, Puget added approximately 16,600 electric customers
and approximately 25,000 gas customers, representing annualized growth rates of
1.9% and 4.6%, respectively. During the 12 months ended June 30, 2000, Puget's
billed retail revenues from electric utility operations were derived 47% from
residential customers, 37% from commercial customers, 14% from industrial
customers and 2% from other customers, and Puget's billed retail revenues from
gas utility operations were derived 60% from residential customers, 30% from
commercial customers, 8% from industrial customers and 2% from other customers.
During this period, the largest customer accounted for 1.8% of Puget's utility
operating revenues.

  Gross electric utility plant at December 31, 1999, was approximately $ 4.0
billion, which consisted of 46% distribution, 28% generation, 15% transmission
and 11% general plant and other. Gross gas utility plant at December 31, 1999,
was approximately $1.4 billion, which consisted of 83% distribution, 5%
transmission and 12% general plant and other.

  At December 31, 1999, Puget had 2,869 aggregate full-time-equivalent utility
employees. Our executive office is located at 411-108th Avenue N.E., Bellevue,
Washington 98004-5515, and our telephone number is (425) 454-6363.

                      PUGET SOUND ENERGY CAPITAL TRUST II

  Puget Sound Energy Capital Trust II is a statutory business trust created
under the Delaware Business Trust Act by way of:

  .  a trust agreement executed by Puget, as sponsor, and the trustee of the
     trust; and

  .  the filing of a certificate of trust with the Secretary of State of the
     State of Delaware.

  At the time of public issuance of the trust preferred securities, the trust
agreement will be amended and restated in its entirety and will be qualified as
an indenture under the Trust Indenture Act of 1939. Puget will directly or
indirectly acquire common securities of the trust in a total liquidation amount
equal to approximately 3% of the total capital of the trust. The trust exists
for the exclusive purposes of:

  .  issuing the trust preferred securities and common securities
     representing undivided beneficial interests in the assets of the trust;


                                       4
<PAGE>

  .  investing the gross proceeds of the common securities and the trust
     preferred securities in the subordinated debentures; and

  .  engaging in only those other activities necessary or incidental thereto.

  The trust has a term of approximately 55 years, but may terminate earlier as
provided in the amended and restated trust agreement.

  The proceeds from the offering of the trust preferred securities and the sale
of the common securities may be used by the trust to purchase from Puget
subordinated debentures in a total principal amount equal to the total
liquidation preference of the common securities and the trust preferred
securities. The Puget debentures would bear interest at an annual rate equal to
the annual distribution rate of the common securities and the trust preferred
securities and would have certain redemption terms which correspond to the
redemption terms for the common securities and the trust preferred securities.
The subordinated debentures will rank subordinate in right of payment to all of
Puget's senior indebtedness (as defined in this prospectus). Distributions on
the common securities and the trust preferred securities may not be made unless
the trust receives corresponding interest payments on the subordinated
debentures from Puget. Puget will irrevocably guarantee, on a subordinated
basis and to the extent set forth in the guarantee, with respect to each of the
common securities and the trust preferred securities, the payment of
distributions, the redemption price, including all accrued or deferred and
unpaid distributions, and payment on liquidation, but only to the extent of
funds on hand at the trust. Each guarantee will be unsecured and will be
subordinate to all senior indebtedness of Puget. Upon the occurrence of certain
events (subject to the conditions to be described in an accompanying prospectus
supplement) the trust may be liquidated and the holders of the common
securities and the trust preferred securities could receive subordinated
debentures in lieu of any liquidating cash distribution.

  Pursuant to the amended and restated trust agreement, the number of trustees
of the trust will initially be four. Two of the trustees will be persons who
are employees or officers of or who are affiliated with Puget and will be
referred to as the Puget trustees. The third trustee will be a financial
institution that is unaffiliated with Puget, which trustee will serve as
property trustee under the amended and restated trust agreement and as
indenture trustee for the purposes of compliance with the provisions of the
Trust Indenture Act of 1939. Initially, Bank One Trust Company, N.A. will be
the property trustee until removed or replaced by the holder of the common
securities. For the purpose of compliance with the provisions of the Trust
Indenture Act of 1939, Bank One Trust Company, N.A. will also act as guarantee
trustee. The fourth trustee, Bank One Delaware, Inc., will act as the Delaware
trustee for the purposes of the Delaware Business Trust Act, until removed or
replaced by the holder of the common securities. See "Description of
Securities--The Guarantee."

  The property trustee will hold title to the subordinated debentures for the
benefit of the holders of the common securities and the trust preferred
securities and the property trustee will have the power to exercise all rights,
powers and privileges under the indenture as the holder of the subordinated
debentures. In addition, the property trustee will maintain exclusive control
of a segregated non-interest-bearing bank account to hold all payments made in
respect of subordinated debentures for the benefit of the holders of the common
securities and the trust preferred securities. The property trustee will make
payments of distributions and payments on liquidation, redemption and otherwise
to the holders of the common securities and the trust preferred securities out
of funds from the segregated non-interest-bearing bank account. The guarantee
trustee will hold the guarantees for the benefit of the holders of the common
securities and the trust preferred securities. Puget, as the direct or indirect
holder of all the common securities, will have the right to appoint, remove or
replace any of the trustees. Puget will also have the right to increase or
decrease the number of trustees, as long as the number of trustees shall be at
least three, a majority of which shall be Puget trustees. Puget will pay all
fees and expenses related to the trusts and the offering of the common
securities and the trust preferred securities.

  The rights of the holders of the trust preferred securities, including
economic rights, rights to information and voting rights, are set forth in the
amended and restated trust agreement, the Delaware Business Trust Act and the
Trust Indenture Act of 1939.

                                       5
<PAGE>

  The Delaware trustee for the trust in the State of Delaware is Bank One
Delaware, Inc., Three Christiana Center, 201 North Walnut Street, Wilmington,
Delaware, 19801. The principal place of business of the trust will be c/o Puget
Sound Energy, Inc. 411-108th Avenue N.E., Bellevue, Washington 98004-5515.

                                USE OF PROCEEDS

  The proceeds received by the trust from the sale of its trust preferred
securities and the common securities will be invested in the subordinated
debentures. As will be more specifically set forth in the applicable prospectus
supplement, Puget will use those borrowed amounts and the net proceeds from the
sale of senior notes offered hereby for its general corporate purposes,
including capital expenditures, investment in subsidiaries, working capital and
repayment of debt. Any specific allocation of the proceeds to a particular
purpose that has been made at the date of any prospectus supplement will be
described in the appropriate prospectus supplement.

                      RATIOS OF EARNINGS TO FIXED CHARGES

  The following table sets forth Puget's ratios of earnings to fixed charges
for the respective periods indicated:

<TABLE>
<CAPTION>
                                Twelve Months
                               Ended June 30,     Years Ended December 31,
                               --------------- ------------------------------
                                2000    1999   1999 1998 1997(1) 1996(1) 1995
                               ------- ------- ---- ---- ------- ------- ----
   <S>                         <C>     <C>     <C>  <C>  <C>     <C>     <C>
   Ratio of earnings to fixed
    charges (2)(3)............    2.7x    2.9x 2.7x 2.8x  2.5x    3.1x   2.6x
</TABLE>
--------
(1) The ratios for the years ended December 31, 1997 and 1996 include charges
    incurred in connection with Puget's merger with Washington Energy Company
    and its principal subsidiary, Washington Natural Gas Company. Had such
    charges been excluded from earnings, the ratios of earnings to fixed
    charges for such periods would have been 2.9x and 3.2x, respectively.

(2) As a result of the merger, each of Puget's ratios reflects the combined
    operations of Puget and the Washington Energy Company. Because the
    Washington Energy Company's fiscal year ended September 30, the combined
    ratios for the two years ended December 31, 1996 reflect the fiscal years
    ended December 31 for Puget and September 30 for the Washington Energy
    Company.

(3) For purposes of computing the ratios of earnings to fixed charges, earnings
    represent income from continuing operations before extraordinary items and
    cumulative effect of changes in accounting principles plus applicable
    income taxes and fixed charges. Fixed charges include all interest expense
    and the proportion deemed representative of the interest factor of rent
    expense.

                                       6
<PAGE>

                           DESCRIPTION OF SECURITIES

Introduction

  Specific terms of the debt securities consisting of the senior notes and
subordinated debentures, or the trust preferred securities, or any combination
of these securities and the irrevocable guarantees of Puget with respect to
each of the common securities and the preferred securities of the trust, for
which this prospectus is being delivered, will be set forth in an accompanying
prospectus supplement or supplements. The prospectus supplement will set forth
with regard to the particular offered securities, without limitation, the
following:

  .  in the case of debt securities, the designation, total principal amount,
     denomination, maturity, premium, if any, any exchange, conversion,
     redemption or sinking fund provisions, interest rate (which may be fixed
     or variable), the time or method of calculating interest payments, the
     right of Puget, if any, to defer payment or interest on the debt
     securities and the maximum length of such deferral, put options, if any,
     public offering price, ranking, any listing on a securities exchange and
     other specific terms of the offering; and

  .  in the case of trust preferred securities, the designation, number of
     shares, liquidation preference per security, initial public offering
     price, any listing on a securities exchange, dividend rate (or method of
     calculation thereof), dates on which dividends shall be payable and
     dates from which dividends shall accrue, any voting rights, any
     redemption, exchange, conversion or sinking fund provisions and any
     other rights, preferences, privileges, limitations or restrictions
     relating to a specific series of the trust preferred securities
     including a description of the Puget guarantee.

Debt Securities

  Senior notes will be issued under a senior note indenture. The subordinated
debentures will be issued under a subordinated debt indenture. The senior note
indenture and the subordinated debt indenture are sometimes referred to in this
prospectus individually as an "indenture" and collectively as the "indentures."

  The following briefly summarizes the material provisions of the indentures
and the debt securities. You should read the more detailed provisions of the
applicable indenture, including the defined terms, for provisions that may be
important to you. You should also read the particular terms of a series of debt
securities, which will be described in more detail in the applicable prospectus
supplement. Copies of the indentures may be obtained from Puget or the
applicable trustee.

  Unless otherwise provided in the applicable prospectus supplement, the
trustee under the senior note indenture will be State Street Bank and Trust
Company and the trustee under the subordinated debt indenture will be Bank One
Trust Company, N.A.

 General

  The indentures provide that debt securities of Puget may be issued in one or
more series, with different terms, in each case as authorized on one or more
occasions by Puget.

  Federal income tax consequences and other special considerations applicable
to any debt securities issued by Puget at a discount will be described in the
applicable prospectus supplement.

  The applicable prospectus supplement relating to any series of debt
securities will describe the following terms, where applicable:

  .  the title of the debt securities;

  .  whether the debt securities will be senior or subordinated debt;

  .  the total principal amount of the debt securities;

                                       7
<PAGE>

  .  the percentage of the principal amount at which the debt securities will
     be sold and, if applicable, the method of determining the price;

  .  the maturity date or dates;

  .  the interest rate or the method of computing the interest rate;

  .  the date or dates from which any interest will accrue, or how such date
     or dates will be determined, and the interest payment date or dates and
     any related record dates;

  .  the location where payments on the debt securities will be made;

  .  the terms and conditions on which the debt securities may be redeemed at
     the option of Puget;

  .  any obligation of Puget to redeem, purchase or repay the debt securities
     at the option of a holder upon the happening of any event and the terms
     and conditions of redemption, purchase or repayment;

  .  any provisions for the discharge of Puget's obligations relating to the
     debt securities by deposit of funds or United States government
     obligations;

  .  whether the debt securities are to trade in book-entry form and the
     terms and any conditions for exchanging the global security in whole or
     in part for paper certificates;

  .  any material provisions of the applicable indenture described in this
     prospectus that do not apply to the debt securities;

  .  any additional amounts with respect to the debt securities that Puget
     will pay to a non-United States person because of any tax, assessment or
     governmental charge withheld or deducted and, if so, any option of Puget
     to redeem the debt securities rather than paying these additional
     amounts;

  .  any additional events of default; and

  .  any other specific terms of the debt securities.

 Exchange and Transfer

  Debt securities may be presented for exchange. Registered debt securities may
be presented for registration of transfer at the offices of the applicable
trustee and, subject to the restrictions set forth in the debt security and in
the applicable prospectus supplement, without service charge, but upon payment
of any taxes or other governmental charges due in connection with the transfer,
subject to any limitations contained in the applicable indenture.

 Payment

  Distributions on the debt securities in registered form will be made at the
office or agency of the applicable trustee in its designated office. However,
at the option of Puget, payment of any interest may be made by check or by wire
transfer. Payment of any interest due on debt securities in registered form
will be made to the persons in whose name the debt securities are registered at
the close of business on the record date for such interest payments. Payments
made in any other manner will be specified in the prospectus supplement.

 Governing Law

  Each indenture and the debt securities will be governed by, and construed in
accordance with, the laws of the State of Washington unless the laws of another
jurisdiction shall mandatorily apply. The rights, duties and obligations of the
trustees under the indentures are governed by and construed in accordance with
the laws of the State of Washington.

                                       8
<PAGE>

Senior Notes

 General

  The following summaries of some important provisions of the senior note
indenture (including its supplements) are not complete and are subject to, and
qualified in their entirety by, all of the provisions of the senior note
indenture, which is an exhibit to the registration statement of which this
prospectus forms a part. In addition, capitalized terms used in this section
and not otherwise defined in this prospectus shall have the meaning given to
them in the senior note indenture.

 Security; Release Date

  Until the release date (as described in the next paragraph), the senior notes
will be secured by one or more series of Puget's first mortgage bonds from
either or both of Puget's current first mortgage indentures issued and
delivered by Puget to the senior note trustee. See "Description of First
Mortgage Bonds." Upon the issuance of a series of senior notes prior to the
release date, Puget will simultaneously issue and deliver to the senior note
trustee, as security for all senior notes, a series of first mortgage bonds
that will have the same stated maturity date and corresponding redemption
provisions, and will be in the same total principal amount as the series of the
senior notes being issued. Any series of first mortgage bonds securing senior
notes may, but need not, bear interest. Any payment by Puget to the senior note
trustee of principal of, interest and/or premium, if any, on a series of first
mortgage bonds will be applied by the senior note trustee to satisfy Puget's
obligations with respect to principal of, interest and/or premium, if any, on
the corresponding senior notes.

  The "release date" will be the date that all first mortgage bonds of Puget
issued and outstanding under its electric utility mortgage indenture with State
Street Bank and Trust Company as mortgage trustee and its gas utility mortgage
indenture with The Bank of New York Company, Inc. as mortgage trustee, other
than first mortgage bonds securing senior notes, have been retired (at, before
or after their maturity) through payment, redemption or otherwise. On the
release date, the senior note trustee will deliver to Puget, for cancellation,
all first mortgage bonds securing senior notes. Not later than 30 days
thereafter, the senior note trustee will provide notice to all holders of
senior notes of the occurrence of the release date. As a result, on the release
date, the first mortgage bonds securing senior notes will cease to secure the
senior notes. The senior notes will then become, at Puget's option, either:

  .  unsecured general obligations of Puget or

  .  will be secured by substitute first mortgage bonds issued under a
     substitute mortgage indenture other than Puget's electric utility
     mortgage or gas utility mortgage.

  Each series of first mortgage bonds that secures senior notes will be secured
by a lien on certain property owned by Puget. See "Description of First
Mortgage Bonds--Priority and Security." Upon the payment or cancellation of any
outstanding senior notes, the senior note trustee will surrender to Puget for
cancellation an equal principal amount of the related series of first mortgage
bonds. Puget will not permit, at any time prior to the release date, the total
principal amount of first mortgage bonds securing senior notes held by the
senior note trustee to be less than the total principal amount of senior notes
outstanding. Following the release date, Puget will cause the mortgages to be
discharged and will not issue any additional first mortgage bonds under its
electric utility mortgage or gas utility mortgage. While Puget will be
precluded after the release date from issuing additional first mortgage bonds,
it will not be precluded under the senior note indenture or senior notes from
issuing or assuming other secured debt, or incurring liens on its property,
except to the extent indicated below under "--Certain Covenants of Puget--
Limitation on Liens."

 Events of Default

  The following constitute events of default under senior notes of any series:

    (1) failure to pay principal of and premium, if any, on any senior note
  of such series when due for five days;

                                       9
<PAGE>

    (2) failure to pay interest on any senior note of such series when due
  for 30 days;

    (3) failure to perform any other covenant or agreement of Puget in the
  senior notes of such series for 90 days after written notice to Puget by
  the senior note trustee or the holders of at least a majority in total
  principal amount of the outstanding senior notes;

    (4) prior to the release date, a default occurs under the gas utility
  mortgage and the gas utility mortgage trustee or the holders of at least a
  majority in principal amount of the outstanding senior notes give notice of
  the default to the senior note trustee;

    (5) prior to the release date, a default occurs under the electric
  utility mortgage and the electric utility mortgage trustee or the holders
  of at least a majority in total principal amount of the outstanding senior
  notes give notice of the default to the senior note trustee;

    (6) if any substituted mortgage bonds are outstanding, a default occurs
  under the substitute mortgage and the trustee under the substitute mortgage
  or the holders of at least a majority in total principal amount of the
  outstanding senior notes give notice of the default to the senior note
  trustee; and

    (7) events of bankruptcy, insolvency or reorganization of Puget specified
  in the senior note indenture.

  If an event of default occurs and is continuing, either the senior note
trustee or the holders of a majority in total principal amount of the
outstanding senior notes may declare the principal amount of all senior notes
to be due and payable immediately.

  The senior note trustee generally will be under no obligation to exercise any
of its rights or powers under the senior note indenture at the request or
direction of any of the holders of senior notes of such series unless those
holders have offered to the senior note trustee reasonable security or
indemnity. Subject to the provisions for indemnity and certain other
limitations contained in the senior note indenture, the holders of a majority
in principal amount of the outstanding senior notes of such series generally
will have the right to direct the time, method and place of conducting any
proceeding for any remedy available to the senior note trustee, or of
exercising any trust or power conferred on the senior note trustee. The holders
of a majority in principal amount of the outstanding senior notes of such
series generally will have the right to waive any past default or event of
default (other than a payment default) on behalf of all holders of senior notes
of such series.

  No holder of senior notes of a series may institute any action against Puget
under the senior note indenture unless:

    (1) that holder gives to the senior note trustee advance written notice
  of default and its continuance;

    (2) the holders of not less than a majority in total principal amount of
  senior notes of such series then outstanding affected by that event of
  default request the senior note trustee to institute such action;

    (3) that holder has offered the senior note trustee reasonable indemnity;
  and

    (4) the senior note trustee shall not have instituted such action within
  60 days of such request.

  Furthermore, no holder of senior notes will be entitled to institute any such
action if and to the extent that that action would disturb or prejudice the
rights of other holders of senior notes of such series.

  Within 90 days after the occurrence of a default with respect to the senior
notes of a series, the senior note trustee must give the holders of the senior
notes of such series notice of any such default known to the senior note
trustee, unless cured or waived. The senior note trustee may withhold such
notice if it determines in good faith that it is in the interest of such
holders to do so except in the case of default in the payment of principal of,
and interest and/or premium, if any, on any senior notes of such series. Puget
is required to deliver to the senior note trustee each year a certificate as to
whether or not, to the knowledge of the officers signing such certificate,
Puget is in compliance with the conditions and covenants under the senior note
indenture.

                                       10
<PAGE>

 Modification

  Except as provided in the paragraph below, Puget and the senior note trustee
cannot modify or amend the senior note indenture without the consent of the
holders of a majority in principal amount of the outstanding affected senior
notes. Puget and the senior note trustee cannot modify or amend the senior note
indenture without the consent of the holder of each outstanding senior note of
such series to:

    (1) change the maturity date of any senior note of such series;

    (2) reduce the rate (or change the method of calculation thereof) or
  extend the time of payment of interest on any senior note of such series;

    (3) reduce the principal amount of, or premium payable on, any senior
  note of such series;

    (4) change the coin or currency of any payment of principal of, and
  interest and/or premium on any senior note of such series;

    (5) change the date on which any senior note of such series may be
  redeemed or repaid at the option of its holder or adversely affect the
  rights of a holder to institute suit for the enforcement of any payment on
  or with respect to any senior note of such series;

    (6) impair the interest of the senior note trustee in the first mortgage
  bonds securing the senior notes of such series held by it or, prior to the
  release date, reduce the principal amount of any series of first mortgage
  bond securing the senior notes of such series to an amount less than the
  principal amount of the related series of senior notes or alter the payment
  provisions of such first mortgage bonds in a manner adverse to the holders
  of the senior notes; or

    (7) modify the senior notes of such series necessary to modify or amend
  the senior note indenture or to waive any past default to less than a
  majority.

  Puget and the senior note trustee can modify and amend the senior note
indenture without the consent of the holders in certain cases, including:

    (1) to add to the covenants of Puget for the benefit of the holders or to
  surrender a right conferred on Puget in the senior note indenture;

    (2) to add further security for the senior notes of such series;

    (3) to supply omissions, cure ambiguities or correct defects which
  actions, in each case, are not prejudicial to the interests of the holders
  in any material respect; or

    (4) to make any other changes that are not prejudicial to the holders of
  senior notes of such series.

 Defeasance and Discharge

  The senior note indenture provides that Puget will be discharged from any and
all obligations in respect to the senior notes of such series and the senior
note indenture (except for certain obligations such as obligations to register
the transfer or exchange of senior notes, replace stolen, lost or mutilated
senior notes and maintain paying agencies) if, among other things, Puget
irrevocably deposits with the senior note trustee, in trust for the benefit of
holders of senior notes of such series, money or certain United States
government obligations, or any combination of money or government obligations,
which through the payment of interest and principal on the deposits in
accordance with their terms must provide money in an amount sufficient, without
reinvestment, to make all payments of principal of, and any premium and
interest on, the senior notes on the dates such payments are due in accordance
with the terms of the senior note indenture and the senior notes of such
series. Unless all of the senior notes of such series are to be due within 90
days of such deposit by redemption or otherwise, Puget must also deliver to the
senior note trustee an opinion of counsel to the effect that the holders of the
senior notes of such series will not recognize income, gain or loss for federal
income tax purposes as a result of that defeasance or discharge of the senior
note indenture. Thereafter, the holders of senior notes must look only to the
deposit for payment of the principal of, and interest and any premium on, the
senior notes.

                                       11
<PAGE>

 Consolidation, Merger and Sale or Disposition of Assets

  Puget may consolidate with or merge into, or sell or otherwise dispose of its
properties as or substantially as an entirety if:

    (1) the successor or transferee corporation is a corporation organized
  and existing under the laws of the United States of America, any state
  thereof, or the District of Columbia,

    (2) the new corporation assumes the due and punctual payment of the
  principal of and premium and interest on all the senior notes and the
  performance of every covenant of the senior note indenture to be performed
  or observed by Puget,

    (3) if prior to the release date, the new corporation assumes Puget's
  obligations under its electric utility and gas utility mortgage with
  respect to first mortgage bonds securing senior notes, and

    (4) if after the release date and there are substitute first mortgage
  bonds outstanding, the new corporation assumes Puget's obligations under
  the substitute first mortgage with respect to substitute first mortgage
  bonds securing senior notes.

  The senior note indenture defines "all or substantially all" of the assets of
Puget as being 50% or more of the total assets of Puget as shown on its balance
sheet as of the end of the prior year. The senior note indenture specifically
permits any sale, transfer or other disposition during a calendar year of less
than 50% of total assets without the consent of the holders of the senior notes
and without the assumption by the transferee of Puget's obligations on the
senior notes and covenants contained in the senior note indenture.

 Certain Covenants of Puget

  Limitation on Liens

  Puget cannot issue any first mortgage bonds other than first mortgage bonds
that secure senior notes. After the release date, Puget will be precluded from
issuing additional first mortgage bonds under its electric utility mortgage and
gas utility mortgage. Unless substitute first mortgage bonds are issued to
secure senior notes, Puget may not issue, assume, guarantee or permit to exist
after the release date any debt that is secured by any mortgage, security
interest, pledge or lien (each a "lien") of or upon any real property or other
depreciable asset used in Puget's electric and gas utility business, whether
owned at the date of the senior note indenture or thereafter acquired, without
in any such case effectively securing the senior notes (together with, if Puget
shall so determine, any other indebtedness of Puget ranking equally with the
senior notes) equally and ratably with such debt (but only so long as such debt
is so secured). The foregoing restriction will not apply to:

    (1) liens on any property existing at the time of its acquisition (but
  excluding any extension of or addition to such property unless the terms of
  the mortgage as of the date of the acquisition of such property provide
  that such mortgage shall be secured by such extensions or additions);

    (2) liens to secure the payment of all or part of the purchase price of
  property or to secure any debt incurred prior to, at the time of or within
  180 days after the acquisition of such property for the purpose of
  financing all or part of the purchase price of such property;

    (3) liens secured by property used in the generation of electricity;

    (4) liens existing as of the date of the senior note indenture;

    (5) certain permitted encumbrances similar to the permitted encumbrances
  under the electric utility mortgage;

    (6) any extension, renewal or replacement (or successive extensions,
  renewals or replacements), in whole or in part, of any lien referred to in
  clauses (1) through (5); provided, however, that the principal amount of
  debt secured thereby may not exceed the principal amount of debt (plus any
  premium or fee payable in connection with such extension, renewal or
  replacement) so secured at the time of such

                                       12
<PAGE>

  extension, renewal or replacement; and provided, further, that such lien
  must be limited to all or such part of the property which was subject to
  the mortgage so extended, renewed or replaced (plus improvements on such
  property);

    (7) liens in favor of the United States, any state of the United States,
  any other country or any political subdivision of any of the foregoing, to
  secure partial, progress, advance or other payments under any contract or
  statute; or

    (8) liens securing industrial development, pollution control or similar
  revenue bonds.

  Notwithstanding the foregoing restriction, Puget may create, assume or incur
any lien not excepted above without equally and ratably securing the senior
notes if the aggregate amount of all debt then outstanding and secured by such
lien or any other lien not excepted above, together with all net sale proceeds
from sale-leaseback transactions which are not described in clause (1) or (2)
under "--Limitations on Sale-Leaseback Transactions" below, does not exceed 15%
of Puget's total consolidated capitalization as shown on its latest audited
consolidated balance sheet.

  Limitation on Sale and Lease-Back Transactions

  Unless substituted first mortgage bonds are issued to secure the senior
notes, after the release date Puget may not sell or transfer any real property
interest or other depreciable asset and take back a lease of such property
unless:

    (1) the sale and leaseback transaction occurs within 180 days after the
  later of the date of acquisition of such property or the date of the
  completion of construction or commencement of full operations on such
  property, or

    (2) within 120 days after the sale and leaseback transaction, Puget
  applies or causes to be applied to the retirement of debt of Puget (other
  than debt which is subordinate in right of payment to senior notes) an
  amount not less than the net proceeds of the sale of such property.

  Notwithstanding the foregoing restriction, Puget may effect any sale and
leaseback transaction not excepted above if the net sale proceeds from the sale
and leaseback transaction, together with the net sale proceeds from all other
sale and leaseback transactions not excepted above and all debt then
outstanding and secured by mortgages not described in any of clauses (1)
through (8) under "--Limitations on Liens," does not exceed 15% of Puget's
total consolidated capitalization as shown on its latest audited consolidated
balance sheet. Puget may also effect any sale and leaseback transaction
involving a lease for a period, including renewals, of not more than 36 months.

 Voting of First Mortgage Bonds Held by Senior Note Trustee

  The senior note trustee, as the holder of first mortgage bonds securing
senior notes, will attend any meeting of bondholders under Puget's electric
utility mortgage and gas utility mortgage, or, at its option, will deliver its
proxy in connection therewith as it relates to matters with respect to which it
is entitled to vote or consent. The senior note trustee will vote all of the
electric utility bonds or gas utility bonds held by it, or will consent with
respect thereto, as directed by holders of a majority in total principal amount
of the outstanding senior notes; provided, however, that the senior note
trustee is not required to vote the electric utility or gas utility bonds of
any particular issue in favor of, or give consent to, any action except upon
notification by the senior note trustee to the holders of the related issue of
senior notes of such proposal and consent thereto of the holders of a majority
in principal amount of the outstanding senior notes of such issue.

 Concerning the Senior Note Trustee

  State Street Bank and Trust Company is both the senior note trustee under the
senior note indenture and the mortgage trustee under the electric utility
mortgage indenture, which is described below. Puget and its

                                       13
<PAGE>

affiliates do not currently maintain any other banking relationships with State
Street Bank and Trust Company in the ordinary course of business, but Puget may
choose to do so in the future.

  The senior note trustee may resign at any time by giving written notice to
Puget specifying the day on which the resignation is to take effect. The
resignation will take effect immediately upon the later of the appointment of a
successor senior note trustee and the day specified by the senior note trustee.

  The senior note trustee may be removed at any time by a written instrument
filed with the senior note trustee and signed by the holders of at least a
majority in total principal amount of outstanding senior notes. In addition, if
no event of default has occurred and is continuing, Puget may remove the senior
note trustee upon notice to the holder of each senior note outstanding and the
senior note trustee, and appointment of a successor senior note trustee.

Description of the First Mortgage Bonds

 General

  The first mortgage bonds securing the senior notes are to be issued under
Puget's electric utility mortgage indenture or its gas utility mortgage
indenture, each as amended and supplemented by various supplemental indentures.
State Street Bank and Trust Company will act as the electric utility mortgage
trustee and The Bank of New York Company, Inc. will act as the gas utility
mortgage trustee.

  The statements herein concerning these mortgage indentures are outlines and
are not complete and are subject to, and qualified in their entirety by, all of
the provisions of the electric utility and gas utility mortgage indentures,
which are exhibits to the registration statement of which this prospectus forms
a part. They make use of defined terms and are qualified in their entirety by
express reference to the mortgage indentures, copies of which are available
upon request to the senior note trustee.

  First mortgage bonds securing senior notes will be issued as security for
Puget's obligations under the senior note indenture and will be immediately
delivered to and registered in the name of the senior note trustee. The first
mortgage bonds securing senior notes will be issued as security for senior
notes of a series and will secure the senior notes of that series until the
release date. The senior note indenture provides that the senior note trustee
shall not transfer any first mortgage bonds securing senior notes except to a
successor trustee, to Puget (as provided in the senior note indenture) or in
compliance with a court order in connection with a bankruptcy or reorganization
proceeding of Puget.

  First mortgage bonds securing senior notes will correspond to the senior
notes of its related series in respect of principal amount, interest rate,
maturity date and redemption provisions. Upon payment of the principal or
premium, if any, or interest on senior notes of a series, the related first
mortgage bonds in a principal amount equal to the principal amount of such
senior notes will, to the extent of such payment of principal, premium or
interest, be deemed fully paid and the obligation of Puget to make such payment
shall be discharged.

The Electric Utility Mortgage Bonds

 Priority and Security

  The electric utility mortgage bonds securing senior notes of any series will
rank equally as to security with bonds of other series now outstanding or
issued later under the electric utility mortgage. This security is a direct
first lien on Puget's electric utility property and its electric franchises and
permits (other than certain property expressly excluded from the lien (such as
cash, securities, notes, accounts receivable and similar instruments;
conditional sales, appliance rental or lease agreements; materials and
supplies; merchandise held for the purpose of sale, lease or distribution; fuel
(including fissionable material) and personal property consumable in
operations; oil, gas and other minerals and timber under or upon lands of
Puget; office furniture

                                       14
<PAGE>

and equipment, automobiles and similar transportation equipment; nonutility
property and certain property of a successor corporation in a merger or
consolidation. This lien is subject to excepted encumbrances (and certain other
limitations) as defined and described in the electric utility mortgage
indenture. It is also subject to the lien of the gas utility mortgage with
respect to Puget's gas utility property that was acquired in connection with
the merger with Washington Energy Company on February 10, 1997. The electric
utility mortgage indenture permits the acquisition of property subject to prior
liens.

 Dividend Restriction

  So long as any of the electric utility mortgage bonds are outstanding, Puget
shall not do either of the following, except out of net income available for
dividends on its common stock, accumulated after December 31, 1957, plus the
sum of $7,500,000:

  .  declare or pay any dividends (other than dividends payable in Puget's
     common stock) or make any other distribution on any shares of its common
     stock, or

  .  purchase, redeem or otherwise retire for consideration any shares of
     stock.

 Issuance of Electric Utility Mortgage Bonds and Withdrawal of Cash Deposited
Against Such Issuance

  The principal amount of electric utility mortgage bonds that Puget may issue
under the electric utility mortgage is not limited, provided that the issuance
tests in the electric utility mortgage are satisfied. Electric utility mortgage
bonds may be issued from time to time against one or more of the following:

  .  60% of unfunded net property additions;

  .  deposit of cash with the electric utility mortgage trustee; and

  .  100% of unfunded electric utility mortgage bond credits.

  The issuance of electric utility mortgage bonds against unfunded net
additions, with certain exceptions, is subject to net earnings available for
interest being at least two times the annual interest requirement on all
electric utility mortgage bonds and prior lien debt to be outstanding. Cash
deposited is withdrawable against 60% of unfunded net additions and 100% of
unfunded electric utility mortgage bond credits.

 Depreciation Fund

  Puget will pay cash or deliver electric utility mortgage bonds of any series
to the electric utility mortgage trustee by May 31 of each year in an amount
equal to the minimum provision for depreciation for the preceding year (i.e.,
an amount by which 15% of gross utility operating revenues of Puget, after
deducting cost of electricity purchased and rental and lease payments, exceeds
maintenance, repairs and renewals). Cash held in the depreciation fund may be
applied to the retirement of the electric utility mortgage bonds of certain of
the Secured Medium-Term Notes, Series A, certain of the Secured Medium-Term
Notes, Series B, certain of the Secured Medium-Term Notes, Series C, the 7.05%
Series due 2021, the 7.25% Series due 2021 and the 6.80% Series due 2022 (the
last three series were issued as collateral for City of Forsyth, Rosebud
County, Montana, Pollution Control Revenue Refunding Bonds) at a price not
exceeding the applicable regular redemption price thereof, or other electric
utility mortgage bonds at a price not exceeding the applicable special
redemption price thereof. In lieu of paying cash or delivering electric utility
mortgage bonds, Puget will have the option of satisfying this obligation
through the use of unfunded property additions or unfunded electric utility
mortgage bond credits, or both. Cash and electric utility mortgage bonds held
in such fund may also be withdrawn by using either of the aforesaid credits.

 Modification of Mortgage

  The rights of the bondholders under the electric utility mortgage may be
modified by Puget with the consent of the holders of 66 2/3% in total principal
amount of the electric utility bonds, and of not less than

                                       15
<PAGE>

66 2/3% of the principal amount of each series affected. In general, however,
no modification of the terms of payment of principal or interest and no
modification affecting the lien or reducing the percentage required for
modification is effective against any bondholder without the bondholder's
consent.

  Puget anticipates that its fuel costs may increase in the future, causing an
increase in revenue that may escalate the minimum provision for depreciation
out of proportion with Puget's reasonable maintenance and replacement needs. If
such an event occurs, Puget would propose to modify the electric utility
mortgage by reducing the amount of operating revenues used in determining the
minimum provision for depreciation by the amount of fuel costs. Thus, each
supplemental indenture for a new series of electric utility mortgage bonds will
provide that each holder consents to this anticipated modification. When Puget
obtains consents from the holders of 66 2/3% of each series of electric utility
mortgage bonds then outstanding, the modification will become effective.

 Concerning the Mortgage Trustee

  The State Street Bank and Trust Company is the mortgage trustee under the
electric utility mortgage indenture. Puget and its affiliates do not currently
maintain any other banking relationships with State Street Bank and Trust
Company in the ordinary course of business, but Puget may choose to do so in
the future.

  The holders of a majority in total principal amount of the electric utility
mortgage bonds have the right to require the electric utility mortgage trustee
to enforce the electric utility mortgage, but the electric utility mortgage
trustee is entitled to receive reasonable indemnity and is not required to act
under certain circumstances.

 Defaults

  The electric utility mortgage defines the following as "defaults":

  .  failure to pay principal and premium when due;

  .  failure to pay interest for 30 days after becoming due;

  .  failure to pay any installment of any sinking or other purchase fund for
     60 days;

  .  an unstayed continuance for 90 days after an entry of an order for
     reorganization or an appointment of a trustee;

  .  certain events in bankruptcy, insolvency or reorganization;

  .  an unsatisfied continuance for 90 days after entry of a judgment in
     excess of $100,000; and

  .  failure for 90 days after notice to observe other covenants or
     conditions.

  The electric utility mortgage indenture does not contain a provision
requiring any periodic evidence to be furnished as to the absence of default or
as to compliance with the terms thereof.

Gas Utility Mortgage Bonds

 Priority and Security

  The gas utility mortgage bonds securing senior notes of any series will rank
equally as to security with gas utility mortgage bonds of other series now
outstanding or issued later under the gas utility mortgage indenture. This
security is a direct first lien on all of Puget's gas utility property, on its
gas utility franchises and permits and on its gas purchase contracts (other
than certain property expressly excluded from the lien (such as cash,
securities, notes, accounts receivable and similar instruments; conditional
sales, appliance rental or lease agreements; material and supplies; merchandise
held for the purpose of sale, lease or distribution; gas or liquid hydrocarbons
in pipe lines and in storage; fuel and personal property consumable in
operations; oil, gas and

                                       16
<PAGE>

other minerals and timber under or upon lands of Puget; office furniture and
equipment, automobiles and similar transportation equipment; nonutility
property and certain property of a successor corporation in a merger or
consolidation)). All property owned by Puget immediately prior to its merger
with Washington Energy Company on February 10, 1997 is excepted from the lien
of the gas utility mortgage . All property acquired by Puget after the merger
is also excepted from the lien, unless the property improves or replaces the
gas utility property owned by Washington Energy Company at the time of the
merger. This lien is subject to excepted encumbrances (and certain other
limitations) as defined and described in the gas utility mortgage indenture.
The mortgage indenture permits the acquisition of property subject to prior
liens, but this property will not be considered as additional property under
the gas utility mortgage until the prior lien is paid.

 Dividend Restriction

  If the aggregate amount of all the dividends, distributions and expenditures
listed below made since September 30, 1994 would exceed the aggregate amount of
the net income of Puget accumulated after September 30, 1994 plus the sum of
$20,000,000, Puget shall not do any of the following so long as any of Puget's
Secured Medium Term Notes, Series C, issued under the gas utility mortgage, are
outstanding:

  .  declare or pay any dividends (other than dividends payable in Puget's
     common stock) or make any other distribution on any shares of its common
     stock, or

  .  purchase, redeem or otherwise retire for consideration any shares of
     stock (other than in exchange for, or from the net cash proceeds of,
     other new shares of capital stock of Puget and other than any shares of
     any class of stock ranking as to dividends or assets prior to Puget's
     common stock required to be purchased, redeemed or otherwise retired for
     any sinking fund or purchase fund for such class of stock).

 Renewal Fund

  Puget will pay cash and/or deliver gas utility mortgage bonds (taken at the
principal amount thereof) to the gas utility mortgage trustee for deposit into
a renewal fund on or before May 1 of each year in an amount equal to the
greater of:

    (a) the aggregate amount of the minimum provision for depreciation (i.e.,
  an amount computed at the rate of 2% per annum, or such other rate as may
  be permitted or required by the Washington Utilities and Transportation
  Commission, of the book value of depreciable gas utility property subject
  to the lien of the gas utility mortgage and not to prior liens) from March
  1, 1957 to the end of the next preceding calendar year; or

    (b) the aggregate amount of retirements for the same period;

in excess of the greater of:

    (A) the aggregate amounts for the minimum provision for depreciation or
  retirements, whichever is greater, shown in the next preceding renewal fund
  certificate filed with the gas utility mortgage trustee pursuant to the
  requirements of Section 4.04 of the gas utility mortgage; or

    (B) the aggregate amounts for the minimum provision for depreciation or
  retirements, whichever is greater, shown in the latest certificate of
  available net additions delivered to the gas utility mortgage trustee
  pursuant to Section 2.01 of the gas utility mortgage;

less the aggregate amount of gas utility mortgage bonds retired by sinking fund
operations, not theretofore used as a credit on account of the renewal fund in
previous renewal fund certificates. The renewal fund obligation may be
satisfied in whole or in part by credits consisting of unfunded property
additions and/or unfunded gas utility mortgage bonds credits.

  Any cash deposited in the renewal fund, if and to the extent that Puget at
the time does not have property additions available for use as a credit to
satisfy such renewal fund obligation, may, upon the written order of

                                       17
<PAGE>

Puget, be applied by the gas utility mortgage trustee to the redemption of
certain gas utility mortgage bonds or, if not so applied pursuant to the
provisions of the gas utility mortgage, to the retirement of gas utility
mortgage bonds.

 Issuance of Gas Bonds and Withdrawal of Cash Deposited Against Such Issuance

  The principal amount of gas utility mortgage bonds issuable under the gas
utility mortgage is not limited, provided that the issuance tests in the gas
utility mortgage are satisfied. Gas utility mortgage bonds may be issued from
time to time against one or more of the following:

  .  60% of unfunded net property additions;

  .  deposit of cash with the gas utility mortgage trustee; and

  .  100% of unfunded gas utility mortgage bond credits.

  With certain exceptions, the issuance of gas utility mortgage bonds is
subject to net earnings available for interest being at least:

    (1) two times the annual interest requirements on all Gas Bonds and prior
  lien debt to be outstanding; and

    (2) 1.75 times the annual interest charges on all indebtedness of Puget
  to be outstanding immediately after such issuance.

  Cash deposited is withdrawable against 60% of unfunded net property additions
in the case of moneys on deposit with the gas utility mortgage trustee for the
purpose described above, 100% of the amount of unfunded net additions in the
case of any other trust moneys and 100% of unfunded gas utility mortgage bond
credits.

 Modification of Mortgage

  The rights of the bondholders under the gas utility mortgage may be modified
by Puget with the consent of the holders of 66 2/3% in total principal amount
of the gas utility mortgage bonds and of not less than 66 2/3% of the principal
amount of each series affected. In general, however, no modification of the
terms of payment of principal or interest and no modification affecting the
lien or reducing the percentage required for modification is effective against
any bondholder without the bondholder's consent.

 Concerning the Mortgage Trustee

  The Bank of New York Company, Inc. is the gas utility mortgage trustee under
the mortgage indenture. The Bank of New York Company, Inc. is one of the
lenders under Puget's revolving credit facility.

  The holders of a majority in total principal amount of the electric utility
mortgage bonds have the right to require the gas utility mortgage trustee to
enforce the gas utility mortgage, but the electric utility mortgage trustee is
entitled to receive reasonable indemnity and is not required to act under
certain circumstances.

 Defaults

  The gas utility mortgage defines the following as "defaults":

  .  failure to pay principal and premium when due;

  .  failure to pay interest for ten days after becoming due;

  .  failure to pay any installment of any sinking or other purchase fund for
     30 days after becoming due;

  .  certain events in bankruptcy, insolvency or reorganization;

                                       18
<PAGE>

  .  failure to pay money due under any indebtedness other than gas utility
     mortgage bonds in an amount of $500,000 or more or the failure to
     perform any other agreement evidencing the indebtedness if Puget's
     failure causes any payments to become due prior to the due date;

  .  an unsatisfied continuance for 90 days after entry of a judgment in
     excess of $100,000;

  .  an unstayed continuance for 60 days after an entry of an order for
     reorganization or an appointment of a trustee; and

  .  failure for 30 days after notice to observe other covenants and
     conditions after notice.

  The gas utility mortgage indenture does not contain a provision requiring any
periodic evidence to be furnished as to the absence of default or as to
compliance with the terms thereof.

Subordinated Debentures

  The subordinated debentures will be issued under the subordinated debt
indenture and will rank subordinated and junior in right of payment, to the
extent set forth in the subordinated debt indenture, to all "senior
indebtedness" (as defined below) of Puget.

  If Puget defaults in the payment of any distributions on any senior
indebtedness when it becomes due and payable after any applicable grace period,
then, unless and until the default is cured or waived or ceases to exist, Puget
cannot make a payment on account of or redeem or otherwise acquire the
subordinated debentures. The subordinated debt indenture provisions described
in this paragraph, however, do not prevent Puget from making sinking fund
payments in subordinated debentures acquired prior to the maturity of senior
indebtedness or, in the case of default, prior to such default and notice
thereof. If there is any insolvency, bankruptcy, liquidation or other similar
proceeding relating to Puget, its creditors or its property, then all senior
indebtedness must be paid in full before any payment may be made to any holders
of subordinated debentures. Holders of subordinated debentures must return and
deliver any payments received by them, other than in a plan of reorganization
or through a defeasance trust as described above, directly to the holders of
senior indebtedness until all senior indebtedness is paid in full.

  "Senior indebtedness" means distributions on the following, whether
outstanding on the date of execution of the subordinated debt indenture or
thereafter incurred, created or assumed:

  .  indebtedness of Puget for money borrowed by Puget or evidenced by
     debentures (other than the subordinated debentures), notes, bankers'
     acceptances or other corporate debt securities or similar instruments
     issued by Puget;

  .  capital lease obligations of Puget;

  .  obligations of Puget incurred for deferring the purchase price of
     property, with respect to conditional sales, and under any title
     retention agreement (but excluding trade accounts payable arising in the
     ordinary course of business);

  .  obligations of Puget with respect to letters of credit;

  .  all indebtedness of others of the type referred to in the four preceding
     clauses assumed by or guaranteed in any manner by Puget or in effect
     guaranteed by Puget; or

  .  renewals, extensions or refundings of any of the indebtedness referred
     to in the preceding five clauses unless, in the case of any particular
     indebtedness, renewal, extension or refunding, under the express
     provisions of the instrument creating or evidencing the same or the
     assumption or guarantee of the same, or pursuant to which the same is
     outstanding, such indebtedness or such renewal, extension or refunding
     thereof is not superior in right of payment to the subordinated debt
     securities.

  The subordinated debt indenture does not limit the total amount of senior
indebtedness that may be issued. As of June 30, 2000, senior indebtedness of
Puget totaled approximately $1,939,860,000.

                                       19
<PAGE>

 Certain Covenants

  If trust debt securities are issued to the trust or the trustee of the trust
in connection with the issuance of trust preferred securities of the trust,
Puget will covenant that it will not:

    (1) declare or pay any dividends or distributions on, or redeem,
  purchase, acquire, or make a liquidation payment with respect to, any of
  Puget's capital stock; or

    (2) make any payment of principal, interest or premium, if any, on, or
  repay or repurchase or redeem any debt securities (including guarantees of
  indebtedness for money borrowed) of Puget that rank equal with or junior
  to, that trust debt security (other than (a) any dividend, redemption,
  liquidation, interest, principal or guarantee payment by Puget where the
  payment is made by way of securities (including capital stock) that rank
  equal with or junior to the securities on which such dividend, redemption,
  interest, principal or guarantee payment is being made, and (b) payments
  under Puget's guarantees of trust securities);

  if at such time (A) there shall have occurred any event of which Puget has
  actual knowledge that (i) with the giving of notice or the lapse of time,
  or both, would constitute an event of default under the indentures and (ii)
  in respect of which Puget shall not have taken reasonable steps to cure,
  (B) Puget shall be in default with respect to its payment of any
  obligations under the guarantees or (C) Puget will have given notice of its
  selection of an extension period as provided in the indentures with respect
  to the trust debt securities and will not have rescinded such notice, or
  such extension period, or any extension thereof, shall be continuing.

  Puget also covenants:

    (1) to maintain directly or indirectly 100% ownership of the trust common
  securities, provided that certain successors that are permitted pursuant to
  the indentures may succeed to Puget's ownership of the common securities;

    (2) not to voluntarily dissolve, wind-up or liquidate the trust, except:

      (a) in connection with a distribution of the debt securities to the
    holders of the trust preferred securities in liquidation of such trust,
    or

      (b) in connection with certain mergers, consolidations or
    amalgamations permitted by the amended and restated trust agreement;
    and

    (3) to use its reasonable efforts, consistent with the terms and
  provisions of the amended and restated trust agreement, to cause such trust
  to remain classified as a grantor trust and not as an association taxable
  as a corporation for United States federal income tax purposes.

 Events of Default

  The subordinated debt indenture provides that events of default regarding any
series of subordinated debentures include:

  .  failure to pay required interest on any subordinated debentures of such
     series for 30 days;

  .  failure to pay principal other than a scheduled installment payment or
     premium, if any, on any subordinated note of such series when due;

  .  failure to make any required scheduled installment payment on
     subordinated notes of such series;

  .  failure to perform for 60 days after notice any other covenant in the
     relevant indenture other than a covenant included in the relevant
     indenture solely for the benefit of a series of subordinated debentures
     other than such series;

  .  certain events of bankruptcy or insolvency, whether voluntary or not;
     and

                                       20
<PAGE>

  .  such trust is voluntarily or involuntarily dissolved, wound-up or
     terminated, except in connection with the distribution of subordinated
     debentures to the holders of the common securities and the trust
     preferred securities in liquidation of the trust, the redemption of all
     outstanding trust securities of the trust and certain mergers,
     consolidation or amalgamations permitted by the declaration of that
     trust.

  If an event of default regarding subordinated debentures of any series issued
should occur and be continuing, either the subordinated debenture trustee or
the holders of 25% in the principal amount of outstanding subordinated
debentures of such series may declare each subordinated debenture of that
series due and payable.

  Holders of a majority in principal amount of the outstanding subordinated
debentures of any series will be entitled to control certain actions of the
subordinated debenture trustee and to waive past defaults regarding such
series. The trustee generally will not be requested, ordered or directed by any
of the holders of subordinated debentures, unless one or more of such holders
shall have offered to the trustee reasonable security or indemnity.

  Before any holder of any series of subordinated debentures may institute
action for any remedy, except payment on such holder's subordinated debentures
when due, the holders of not less than 25% in principal amount of the
subordinated debentures of that series outstanding must request the
subordinated note trustee to take action. Holders must also offer and give the
satisfactory security and indemnity against liabilities incurred by the trustee
for taking such action.

  Puget is required to annually furnish the subordinated debenture trustee a
statement as to Puget's compliance with all conditions and covenants under the
subordinated debt indenture. The subordinated debenture trustee is required,
within 90 days after the occurrence of a default with respect to a series of
subordinated debentures, to give notice of all defaults affecting such series
of subordinated debentures to each holder of such series of debentures.
However, the subordinated debt indenture provides that the subordinated
debenture trustee may withhold notice to the holders of the subordinated
debentures of any series of any default affecting such series, except payment
on holders' subordinated debentures when due, if it considers withholding
notice to be in the interests of the holders of the subordinated debentures of
such series.

 Consolidation, Merger or Sale of Assets

  The subordinated debt indenture provides that Puget may consolidate with or
merge into, or sell, lease or convey its property as an entirety or
substantially as an entirety to, any other corporation if the successor
corporation assumes the obligations of Puget under the subordinated debentures
and the subordinated debt indenture and is organized and existing under the
laws of the United States of America, any U.S. state or the District of
Columbia.

 Modification of the Indenture

  The subordinated debt indenture permits Puget and the subordinated debenture
trustee to enter into supplemental indentures without the consent of the
holders of the subordinated debentures to:

  .  establish the form and terms of any series of securities under the
     subordinated debt indenture;

  .  secure the subordinated debentures with property or assets;

  .  add covenants of Puget for the benefit of the holders of the
     subordinated debentures;

  .  cure any ambiguity or correct or supplement any provision in the
     indenture or any supplement to the indenture, provided that no such
     action adversely affects the interests of the holders of the
     subordinated debentures; and

  .  evidence and provide for the acceptance of a successor trustee.

                                       21
<PAGE>

  The subordinated debt indenture also permits Puget and the subordinated
debenture trustee, with the consent of the holders of at least a majority in
total principal amount of the subordinated debentures of all series then
outstanding and affected (voting as one class), to change in any manner the
provisions of the subordinated debt indenture or modify in any manner the
rights of the holders of the subordinated debentures of each such affected
series. Puget and the relevant trustee may not, without the consent of the
holder of each subordinated debenture affected, enter into any supplemental
indenture to:

  .  change the time of payment of the principal;

  .  reduce the principal amount of such subordinated debentures;

  .  reduce the rate or change the time of payment of interest on such
     subordinated debentures; or

  .  impair the right to institute suit for the enforcement of any payment on
     any subordinated debentures when due.

  In addition, no such modification may reduce the percentage in principal
amount of the subordinated debentures of the affected series, the consent of
whose holders is required for any such modification or for any waiver provided
for in the subordinated debt indenture.

  Prior to the acceleration of the maturity of any subordinated debentures, the
holders, voting as one class, of a majority in total principal amount of the
subordinated debentures with respect to which a default or event of default has
occurred and is continuing, may, on behalf of the holders of all such affected
subordinated debentures, waive any past default or event of default and its
consequences, except a default or an event of default in respect of a covenant
or provision of the applicable indenture or of any subordinated debenture that
cannot be modified or amended without the consent of the holder of each
subordinated debenture affected.

 Defeasance, Covenant Defeasance and Discharge

  The subordinated debt indenture provides that, at the option of Puget, Puget
will be discharged from all obligations in respect of the subordinated
debentures of a particular series then outstanding (except for certain
obligations to register the transfer of or exchange the subordinated debentures
of such series, to replace stolen, lost or mutilated subordinated debentures of
such series, to maintain paying agencies and to maintain the trust described
below) if Puget in each case irrevocably deposits in trust with the relevant
trustee money, and/or securities backed by the full faith and credit of the
United States which, through the payment of the principal thereof and the
interest thereon in accordance with their terms, will provide money in an
amount sufficient to pay all the principal and interest on the subordinated
debentures of such series on the stated maturities of such subordinated
debentures in accordance with the terms thereof.

  To exercise this option, Puget is required to deliver to the relevant trustee
an opinion of independent counsel to the effect that the exercise of such
option would not cause the holders of the subordinated debentures of such
series to recognize income, gain or loss for United States federal income tax
purposes as a result of such defeasance, and such holders will be subject to
United States federal income tax on the same amounts, in the same manner and at
the same times as would have been the case if such defeasance had not occurred.

Trust Preferred Securities

 General

  The trust may issue, on one or more occasion, trust preferred securities
having terms described in the prospectus supplement relating thereto. The
amended and restated trust agreement of the trust will authorize the
establishment of no more than one series of trust preferred securities, having
such terms, including distributions, redemption, voting, liquidation rights and
such other preferred, deferred or other special rights or such rights or
restrictions as shall be set forth therein or otherwise established by the
trustees pursuant thereto.

                                       22
<PAGE>

You should read the prospectus supplement relating to the trust preferred
securities for specific terms, including:

  .  the distinctive designation and the number of trust preferred securities
     to be offered, which will represent undivided beneficial interests in
     the assets of the trust;

  .  the annual distribution rate and the dates or date upon which such
     distributions will be paid, provided, however, distributions on the
     trust preferred securities will be paid quarterly in arrears to holders
     of trust preferred securities as of a record date on which the trust
     preferred securities are outstanding;

  .  whether distributions on trust preferred securities would be deferred
     during any deferral of interest payments on the debt securities,
     provided, however, that no such deferral, including extensions, if any,
     may exceed 20 consecutive quarters nor extend beyond the stated maturity
     date of the trust debt securities, and at the end of any such deferrals,
     Puget will make all interest payments then accrued or deferred and
     unpaid (including any compounded interest);

  .  the amount of any liquidation preference;

  .  the obligation, if any, of the trust to redeem trust preferred
     securities as a result of the exercise by Puget of an option on the
     corresponding debt securities and the price or prices at which, the
     period or periods within which and the terms and conditions upon which
     trust preferred securities will be purchased or redeemed, in whole or in
     part, under such obligation;

  .  the period or periods within which and the terms and conditions, if any,
     including the price or prices or the rate or rates of conversion or
     exchange and the terms and conditions of any adjustments, upon which the
     trust preferred securities shall be convertible or exchangeable at the
     option of the holder of the trust preferred securities of other property
     or cash;

  .  the voting rights, if any, of the trust preferred securities in addition
     to those required by law and in the amended and restated trust
     agreement, or set forth under a Puget's guarantee (as defined below);

  .  the additional payments, if any, that the trust will pay as a
     distribution as necessary so that the net amounts received by the trust
     and distributable to the holders of the trust preferred securities,
     after all taxes, duties, assessments or governmental charges of whatever
     nature (other than withholding taxes) have been paid will not be less
     than the amount that would have been received and distributed by the
     trust, and the amount the holders of the trust preferred securities
     would have received, had no such taxes, duties, assessments or
     governmental charges been imposed;

  .  the terms and conditions, if any, upon which the trust debt securities
     may be distributed to holders of trust preferred securities; and

  .  any other relative rights, powers, preferences, privileges, limitations
     or restrictions of the trust preferred securities not inconsistent with
     the amended and restated trust agreement or applicable law.

  All trust preferred securities offered hereby will be irrevocably guaranteed
by Puget, on a subordinated basis and to the extent set forth below under "The
Guarantee." Any applicable federal income tax considerations applicable to any
offering of the trust preferred securities will be described in the prospectus
supplement relating thereto. The total number of trust preferred securities
that the trust shall have authority to issue will be determined pursuant to the
terms of the amended and restated trust agreement.

 Effect of Obligations Under the Debt Securities and the Guarantees

  As will be set forth in the amended and restated trust agreement, the sole
purpose of the trust is to issue the common securities and the trust preferred
securities evidencing undivided beneficial interests in the assets of the
trust, and to invest the proceeds from such issuance and sale to acquire
directly the debt securities from Puget.

                                       23
<PAGE>

  As long as payments of interest and other payments are made when due on the
debt securities, such payments will be sufficient to cover distributions and
payments due on the common securities and the trust preferred securities
because of the following factors:

  .  the total principal amount of debt securities will be equal to the sums
     of the total stated liquidation amount of the common securities and the
     trust preferred securities;

  .  the interest rate and the interest and other payment dates on the debt
     securities will match the distribution rate and distribution and other
     payment dates for the common securities and the trust preferred
     securities;

  .  Puget will pay all, and the trust shall not be obligated to pay,
     directly or indirectly, its costs, expenses, debt and obligations (other
     than with respect to the common securities and the trust preferred
     securities); and

  .  the amended and restated trust agreement will further provide that the
     Puget trustees will not take or cause or permit the trust to, among
     other things, engage in any activity that is not consistent with the
     purposes of the trust.

  Payments of distributions (to the extent funds for distributions are
available) and other payments due on the trust preferred securities (to the
extent funds for other payments are available) are guaranteed by Puget as and
to the extent discussed under "The Guarantee" below. If Puget does not make
interest payments on the debt securities purchased by the trust, it is expected
that the trust will not have sufficient funds to pay distributions on the trust
preferred securities. The Puget guarantee, which is for purpose of ensuring
that the trust performs its obligations to pay distributions on the trust
preferred securities, does not apply to any payment of distributions unless and
until the trust has sufficient funds for the payment of distributions and other
payments on the trust preferred securities. The trust will have sufficient
funds only if and to the extent that Puget has made a payment of interest or
principal on the debt securities held by the trust as its sole asset. The Puget
guarantee, when taken together with Puget's obligations under the debt
securities and the related indenture and its obligations under the amended and
restated trust agreement, including its obligations to pay costs, expenses,
debts and liabilities of the trust (other than with respect to the common
securities and the trust preferred securities), provides a full and
unconditional guarantee of amounts on the trust preferred securities.

  If Puget fails to make interest or other payments on the debt securities when
due (taking account of any extension period), the amended and restated trust
agreement will provide a mechanism whereby the holders of the trust preferred
securities may direct a property trustee to enforce its rights under the debt
securities. If a property trustee fails to enforce its rights under the debt
securities, a holder of trust preferred securities may, to the fullest extent
permitted by applicable law, institute a legal proceeding against Puget to
enforce a property trustee's rights under the debt securities without first
instituting any legal proceeding against a property trustee or any other person
or entity. Notwithstanding the foregoing, if an event of default has occurred
and is continuing under the amended and restated trust agreement, and such
event is attributable to the failure of Puget to pay interest or principal on
the debt securities on the date such interest or principal is otherwise payable
(or in the case of redemption on the redemption date), then a holder of trust
preferred securities may institute legal proceedings directly against Puget to
obtain payment. If Puget fails to make payments under the guarantee, the
guarantee provides a mechanism whereby the holders of the trust preferred
securities may direct the guarantee trustee to enforce its rights thereunder.
Any holder of trust preferred securities may institute a legal proceeding
directly against Puget to enforce the guarantee trustee's rights under the
guarantee without first instituting a legal proceeding against the trust, the
guarantee trustee, or any other person or entity.

The Guarantee

  Set forth below is a summary of information concerning the guarantee that
will be executed and delivered by Puget for the benefit of the holders, from
time to time, of the trust preferred securities. The guarantee will be
qualified as an indenture under the Trust Indenture Act of 1939. Bank One Trust
Company, N.A will act as

                                       24
<PAGE>

indenture trustee under the guarantee for the purpose of compliance with the
provisions of the Trust Indenture Act of 1939. This summary is not complete and
is subject in all respects to the provisions of, and is qualified in its
entirety by reference to, the guarantee, which is filed as an exhibit to the
Registration Statement of which this prospectus forms a part.

 General

  Puget will irrevocably agree to pay in full, on a subordinated basis to the
extent set forth herein, the guarantee payments (as described below) to the
holders of the trust preferred securities, as and when due, regardless of any
defense, right of set-off or counterclaim that the trust may have or assert
other than the defense of payment. The following payments with respect to the
trust preferred securities, to the extent not paid by or on behalf of the
trust, will be subject to a guarantee by Puget of:

    (1) any accumulated and unpaid distributions required to be paid on the
  trust preferred securities, to the extent that the trust has funds on hand
  available therefor at such time;

    (2) the redemption price with respect to any trust preferred securities
  called for redemption to the extent that the trust has funds on hand
  available therefor at such time; or

    (3) upon a voluntary or involuntary dissolution, winding up or
  liquidation of the trust (unless the debt securities are distributed to
  holders of the trust preferred securities), the lesser of (a) the
  liquidation distribution, to the extent that the trust has funds on hand
  available for distribution at such time, and (b) the amount of assets of
  the trust remaining available for distribution to holders of trust
  preferred securities.

  Puget's obligation to make a guarantee payment may be satisfied by direct
payment of the required amounts by Puget to the holders of the trust preferred
securities or by causing the trust to pay such amount to such holders.

  The Puget guarantee will be an irrevocable guarantee on a subordinated basis
of the trust's obligations under the trust preferred securities, but will apply
only to the extent that the trust has funds sufficient to make such payments,
and is not a guarantee of collection. If Puget does not make interest payments
on the debt securities held by the trust, the trust will not be able to pay
distributions on the trust preferred securities and will not have funds legally
available therefor.

  Puget has, through the guarantee, the amended and restated trust agreement,
the subordinated debentures and the indentures, taken together, fully,
irrevocably and unconditionally guaranteed all of the trust's obligations under
the trust 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
trust's obligations under the trust preferred securities.

  Puget has also agreed separately to irrevocably and unconditionally guarantee
the obligations of the trust with respect to the common securities to the same
extent as the guarantee of the preferred securities, except that upon the
occurrence and during the continuation of an amended and restated trust
agreement event of default, holders of trust preferred securities shall have
priority over holders of common securities with respect to distributions and
payments on liquidation, redemption or otherwise.

 Certain Covenants of Puget

  Puget also will covenant that it will not:

    (1) declare or pay any dividends or distributions on, or redeem,
  purchase, acquire or make a liquidation payment with respect to, any of
  Puget's capital stock; or

                                       25
<PAGE>

    (2) make any payment of principal, interest or premium, if any, on or
  repay or repurchase or redeem any debt securities (including guarantees of
  indebtedness for money borrowed) of Puget that rank equal with or junior to
  the trust debt securities (other than (a) any dividend, redemption,
  liquidation, interest, principal or guarantee payment by Puget where the
  payment is made by way of securities (including capital stock) that rank
  equal with or junior to the securities on which such dividend, redemption,
  interest, principal or guarantee payment is being made, (b) payments under
  the Puget guarantee of the trust securities, (c) as a result of a
  reclassification of Puget's capital stock or the exchange or conversion of
  one series or class of Puget's capital stock for another series or class of
  Puget's capital stock and (d) the purchase of fractional interests in
  shares of Puget's capital stock pursuant to the conversion or exchange
  provisions of such capital stock or the security being converted or
  exchanged);

  if at such time (A) there shall have occurred any event of which Puget has
  actual knowledge that (i) with the giving of notice or the lapse of time,
  or both, would constitute a event of default under the indenture and (ii)
  in respect of which Puget shall not have taken reasonable steps to cure,
  (B) Puget shall be in default with respect to its payment of any
  obligations under the guarantee; or (C) Puget shall have given notice of
  its selection of an extension period as provided in the indenture with
  respect to the debt securities and shall not have rescinded such notice, or
  such extension period, or any extension thereof, shall be continuing.

  Puget also will covenant to:

    (1) maintain directly or indirectly 100% ownership of the trust common
  securities, provided that certain successors that are permitted pursuant to
  the indenture may succeed to Puget's ownership of the common securities,

    (2) not voluntarily dissolve, wind up or liquidate the trust, except:

      .  in connection with a distribution of the debt securities to the
         holders of the trust preferred securities in liquidation of the
         trust, or

      .  in connection with certain mergers, consolidations or
         amalgamations permitted by the amended and restated trust
         agreement, and

    (3) use its reasonable efforts, consistent with the terms and provisions
  of the applicable amended and restated trust agreement, to cause the trust
  to remain classified as a grantor trust and not as an association taxable
  as a corporation for United States federal income tax purposes.

 Amendments and Assignment

  Except with respect to any changes that do not materially adversely affect
the rights of holders of the trust preferred securities (in which case no vote
will be required), the Puget guarantee of the trust preferred securities may
not be amended without the prior approval of the holders of not less than a
majority in total liquidation amount of such outstanding trust preferred
securities. All guarantees and agreements contained in the guarantee shall bind
the successors, assigns, receivers, trustees and representatives of Puget and
shall inure to the benefit of the holders of the trust preferred securities
then outstanding.

 Termination of the Guarantee

  Puget's guarantee of the trust preferred securities will terminate and be of
no further force and effect upon full payment of the redemption price of the
trust preferred securities, upon full payment of the amounts payable upon
liquidation of the trust or upon distribution of the debt securities to the
holders of the trust preferred securities in exchange for all of the trust
preferred securities. The guarantee will continue to be effective or will be
reinstated, as the case may be, if at any time any holder of trust preferred
securities must restore payment of any sums paid under such trust preferred
securities or the guarantee.

                                       26
<PAGE>

 Events of Default

  An event of default under Puget's guarantee of the trust preferred securities
will occur upon the failure of Puget to perform any of its payment or other
obligations thereunder. The holders of a majority in total liquidation amount
of the trust 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 the guarantee or to direct the exercise of any trust or
power conferred upon the guarantee trustee under the guarantee.

  If the guarantee trustee fails to enforce Puget's guarantee of the trust
preferred securities, any holder of the trust preferred securities may
institute a legal proceeding directly against Puget to enforce its rights under
the guarantee without first instituting a legal proceeding against the trust,
the guarantee trustee or any other person or entity. In addition, any record
holder of trust preferred securities shall have the right, which is absolute
and unconditional, to proceed directly against Puget to obtain guarantee
payments, without first waiting to determine if the guarantee trustee has
enforced the guarantee or instituting a legal proceeding against the trust, the
guarantee trustee or any other person or entity. Puget has waived any right or
remedy to require that any action be brought just against the trust, or any
other person or entity before proceeding directly against Puget.

 Status of the Guarantee

  The Puget guarantee of the trust preferred securities will constitute an
unsecured obligation of Puget and will rank:

    (1) equal to or subordinate and junior in right of payment to all other
  liabilities of Puget, as applicable,

    (2) equal with the most senior preferred stock now or hereafter issued by
  Puget and with any guarantee now or hereafter entered into by Puget in
  respect of any preferred or preference stock of any affiliate of Puget, and

    (3) senior to Puget's common stock.

  Puget's guarantee of the trust preferred securities 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). The guarantee will be held for the benefit of the
holders of the trust preferred securities. The guarantee will not be discharged
except by payment of the guaranteed payments in full to the extent not paid by
the trust or upon distribution of the debt securities to the holders of the
trust preferred securities. The guarantee does not place a limitation on the
amount of additional indebtedness that may be incurred by Puget.

                              PLAN OF DISTRIBUTION

  Puget and/or the trust may sell the offered securities (1) through the
solicitation of proposals of underwriters or dealers to purchase the offered
securities; (2) through underwriters or dealers on a negotiated basis; (3)
through agents; or (4) directly to a limited number of purchasers or to a
single purchaser.

  The prospectus supplement with respect to any offered securities will set
forth the terms of such offering, including:

  .  the name or names of any underwriters, dealers or agents;

  .  the purchase price of the offered securities and the proceeds to Puget
     and/or the trust from their sale;

  .  any underwriting discounts and commissions and other items constituting
     underwriters' compensation;

  .  any initial public offering price and any discounts or concessions
     allowed or reallowed or paid to dealers; and

                                       27
<PAGE>

  .  any securities exchange on which such offered securities may be listed.

Any initial public offering price, discounts or concessions allowed or
reallowed or paid to dealers may be changed from time to time.

  If underwriters are used in the sale, they will acquire the offered
securities for their own account and may resell them on one or more occasions
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
offered securities may be offered to the public either through underwriting
syndicates represented by one or more managing underwriters or directly by one
or more firms acting as underwriters. The underwriter or underwriters with
respect to a particular underwritten offering of 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 of such prospectus supplement. Unless otherwise set forth in the
prospectus supplement relating thereto, 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 the offered
securities if any are purchased.

  If dealers are utilized in the sale of offered securities, Puget and/or the
trust will sell such offered securities to the dealers as principals. The
dealers may then resell such offered securities to the public at varying prices
to be determined by such dealers at the time of resale. The names of the
dealers and the terms of the transaction will be set forth in the prospectus
supplement relating thereto.

  The offered securities may be sold directly by Puget and/or the trust or
through agents designated by Puget and/or the trust from time to time. Any
agent involved in the offer or sale of the offered securities in respect to
which this prospectus is delivered will be named, and any commissions payable
by Puget and/or the trust to such agent will be set forth, in the prospectus
supplement relating thereto. Unless otherwise indicated in the prospectus
supplement, any such agent will be acting on a best-efforts basis for the
period of its appointment.

  The offered securities may be sold directly by Puget and/or the trust to
institutional investors or others, who may be deemed to be underwriters within
the meaning of the Securities Act with respect to any resale thereof. The terms
of any such sales will be described in the prospectus supplement relating
thereto.

  Agents, dealers and underwriters may be entitled under agreements with Puget
and/or the trust to indemnification by Puget and/or the trust against certain
civil liabilities, including liabilities under the Securities Act, or to
contribution with respect to payments which such agents, dealers or
underwriters may be required to make in respect thereof. Agents, dealers and
underwriters may be customers of, engage in transactions with, or perform
services for Puget and/or the trust in the ordinary course of business.

  The offered securities may also be offered and sold, if so indicated in the
applicable prospectus supplement, in connection with a remarketing upon their
purchase, in accordance with a redemption or repayment pursuant to their terms,
or otherwise, by one or more firms ("remarketing firms"), acting as principals
for their own accounts or as agents for Puget and/or the trust. Any remarketing
firm will be identified and the terms of its agreement, if any, with its
compensation will be described in the applicable prospectus supplement.
Remarketing firms may be deemed to be underwriters, as such term is defined in
the Securities Act, in connection with the offered securities remarketed
thereby. Remarketing firms may be entitled under agreements that may be entered
into with Puget and/or the trust to indemnification or contribution by Puget
and/or the trust against certain civil liabilities, including liabilities under
the Securities Act, and may be customers of, engage in transactions or perform
services for Puget and its subsidiaries in the ordinary course of business.

  The offered securities may or may not be listed on a national securities
exchange. You should read the prospectus supplement for a discussion of this
matter. We cannot assure you there will be a market for any of the offered
securities.

                                       28
<PAGE>

                                 LEGAL OPINIONS

  Opinions as to the legality of certain of the offered securities will be
rendered for Puget by Perkins Coie LLP, Seattle, Washington. Certain matters of
Delaware law relating to the validity of the trust preferred securities will be
passed upon on behalf of the trust by Skadden, Arps, Slate, Meagher & Flom LLP,
special Delaware counsel to the trust. Certain United States federal income
taxation matters may be passed upon for Puget and the trust by either Perkins
Coie LLP, tax counsel for Puget, or by special tax counsel to Puget and to the
trust, who will be named in the prospectus supplement. Certain legal matters
with respect to the offered securities will be passed upon by counsel for any
underwriters, dealers or agents, each of whom will be named in the related
prospectus supplement.

                                    EXPERTS

  The financial statements and financial statement schedule incorporated in
this prospectus by reference to Puget's Annual Report on Form 10-K for the year
ended December 31, 1999 have been so incorporated in reliance on the report of
PricewaterhouseCoopers LLP, independent accountants, given on the authority of
said firm as experts in auditing and accounting.

                                       29
<PAGE>

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                          [LOGO OF PUGET SOUND ENERGY]

                                  $500,000,000

                            PUGET SOUND ENERGY, INC.

                       Senior Medium-Term Notes, Series C
                            Due Nine Months or More
                               From Date of Issue

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

                             PROSPECTUS SUPPLEMENT

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

                              Merrill Lynch & Co.

                              Salomon Smith Barney

                                November 1, 2000

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