WASHINGTON GAS LIGHT CO
424B5, 1995-02-14
NATURAL GAS DISTRIBUTION
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<PAGE>   1
 
PROSPECTUS SUPPLEMENT                                   Rule 424(b)(5)
(To Prospectus Dated January 27, 1995)                  File No. 33-57039
$150,000,000
 
WASHINGTON GAS LIGHT COMPANY
MEDIUM-TERM NOTES, SERIES C
DUE ONE YEAR OR MORE FROM DATE OF ISSUE
 
Washington Gas Light Company (the "Company") may from time to time offer its
Unsecured Notes, designated as Medium-Term Notes, Series C (the "Offered
Notes"), in the aggregate principal amount of up to $150,000,000, subject to
reduction as a result of the sale of other Securities as described in the
accompanying Prospectus. Each Offered Note will mature on a Business Day one
year or more from its date of issue. Each Offered Note may also be subject to
redemption prior to maturity at the option of the Company or pursuant to a
sinking fund, in each case as set forth in a pricing supplement to this
Prospectus Supplement (a "Pricing Supplement").
 
Each Offered Note will bear interest at a fixed rate (a "Fixed Rate Note") or at
a floating rate (a "Floating Rate Note") determined by reference to the
Commercial Paper Rate, LIBOR or the Treasury Rate or any other Base Rate, as
selected by the purchaser and agreed to by the Company, adjusted by the Spread
or Spread Multiplier, if any, applicable to such Offered Note. Unless otherwise
indicated in the applicable Pricing Supplement, interest on each Fixed Rate Note
will be payable semiannually in arrears on each March 15 and September 15 and at
maturity or upon any earlier redemption.
 
The interest rate or interest rate formula, Issue Price, Stated Maturity,
Interest Payment Dates, redemption provisions, provisions for the repayment or
purchase by the Company of any Offered Note at the option of the Holder and
certain other terms with respect to each Offered Note will be established at the
time of issuance and set forth in the applicable Pricing Supplement.
 
Each Offered Note will be represented either by a global Offered Note ("Global
Note") registered in the name of a nominee of The Depository Trust Company, as
Depositary (such an Offered Note, so represented, being called a "Book-Entry
Note"), or by a certificate issued in definitive form (such an Offered Note, so
represented, being called a "Certificated Note"), as set forth in the applicable
Pricing Supplement. Beneficial interests in Global Notes representing Book-Entry
Notes will be shown on, and transfers thereof will be effected only through,
records maintained by the Depositary and its participants. Book-Entry Notes will
not be issuable as Certificated Notes except under the circumstances described
herein. See "Supplemental Description of the Unsecured Notes -- Book-Entry
Notes."
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS SUPPLEMENT, ANY PRICING SUPPLEMENT
HERETO OR THE ACCOMPANYING PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------------
                                           PRICE TO            AGENTS'                      PROCEEDS TO THE
                                           PUBLIC(1)           COMMISSIONS(2)               COMPANY(2)(3)
<S>                                        <C>                 <C>                          <C>
Per Note................................   100.00%             .150% - .750%                99.850% - 99.250%
Total...................................   $150,000,000        $225,000 - $1,125,000        $149,775,000 - $148,875,000
- -----------------------------------------------------------------------------------------------------------------------
</TABLE>
 
(1) Unless otherwise specified in the applicable Pricing Supplement, the price
    to the public will be 100% of the principal amount.
(2) The Company will pay to Salomon Brothers Inc, M.R. Beal & Company, Lehman
    Brothers, Lehman Brothers Inc., (including its affiliate Lehman Government
    Securities Inc.), or Merrill Lynch & Co., Merrill Lynch, Pierce, Fenner &
    Smith Incorporated (each an "Agent", and together, the "Agents") a
    commission ranging from .150% to .750% of the principal amount of any
    Offered Note, depending upon its Stated Maturity, sold through such Agent.
    Commissions on any Offered Notes with a Stated Maturity greater than 30
    years will be negotiated at the time of sale. See "Plan of Distribution".
(3) Before deduction of expenses payable by the Company estimated at $220,431,
    including reimbursement of certain expenses of the Agents.
 
The Offered Notes will be offered on a continuous basis by the Company through
the Agents who have agreed to use reasonable best efforts to solicit offers to
purchase the Offered Notes. The Company may sell Offered Notes at a discount to
each Agent for its own account or for resale to one or more investors or other
purchasers at varying prices related to prevailing market prices at the time of
the resale, as determined by such Agent, or if so specified in an applicable
Pricing Supplement, for resale at a fixed public offering price. In addition,
the Agents may offer Notes purchased by them as principal to other dealers.
Unless otherwise specified in an applicable Pricing Supplement any Offered Note
purchased by an Agent as principal will be purchased at 100% of the principal
amount thereof less a percentage equal to the commission applicable to an agency
sale of an Offered Note of identical Stated Maturity. The Company may sell
Offered Notes to investors on its own behalf. Unless otherwise specified in an
applicable Pricing Supplement, the Offered Notes will not be listed on any
securities exchange. The Company reserves the right to withdraw, cancel or
modify the offer made hereby without notice. The Company or an Agent may reject
any offer, whether or not solicited, in whole or in part. See "Plan of
Distribution."
 
SALOMON BROTHERS INC
                    M*R*BEAL & COMPANY
 
                                       LEHMAN BROTHERS
                                                     MERRILL LYNCH & CO.
The date of this Prospectus Supplement is February 14, 1995.
<PAGE>   2
 
                                USE OF PROCEEDS
 
     The use of proceeds realized from the sale of the Offered Notes will be for
four primary purposes: for the purchase, acquisition and construction of
additional properties and facilities; for the funding of increased working
capital requirements; for the refunding of maturing long-term debt and
satisfaction of sinking fund requirements; and for the refunding of
higher-coupon long-term debt as market conditions permit.
 
                SUPPLEMENTAL DESCRIPTION OF THE UNSECURED NOTES
 
     The following description of the particular terms of the Offered Notes
supplements, and to the extent inconsistent therewith replaces, the description
of the general terms and provisions of the Offered Notes set forth under
"Description of the Unsecured Notes" in the accompanying Prospectus, to which
description reference is hereby made. Certain capitalized terms used herein are
defined under "Description of the Unsecured Notes" in the accompanying
Prospectus. Unless otherwise specified in an applicable pricing supplement, the
following description of the Offered Notes shall apply.
 
GENERAL
 
     The Offered Notes will be issued as a series of debt securities under the
Indenture. The Offered Notes will be limited in aggregate principal amount to
$150,000,000, subject to reduction as a result of the sale of other Securities
as described in the accompanying Prospectus.
 
     The Offered Notes will be issued in fully registered form only, without
coupons. Each Offered Note will be issued initially as either a Book-Entry Note
or a Certificated Note. Except as set forth herein under "Book-Entry Notes" or
in any Pricing Supplement relating to specific Offered Notes, the Offered Notes
will not be issuable as Certificated Notes. Unless otherwise specified in an
applicable Pricing Supplement, the authorized denominations of Global Notes will
be $1,000 and any larger amount that is an integral multiple of $1,000. Unless
otherwise specified by the Company, the authorized denominations of Certificated
Notes will be $1,000 and integral multiples thereof.
 
     Each Offered Note will mature on a Business Day (as defined below) from one
year or more from its date of issue, as selected by the purchaser and agreed to
by the Company. Each Offered Note may also be subject to redemption at the
option of the Company or to repayment or purchase by the Company at the option
of the Holder prior to its Stated Maturity (as defined below). Each Floating
Rate Note will mature on an Interest Payment Date (as defined below) for such
Offered Note.
 
     The Pricing Supplement relating to an Offered Note will describe the
following terms: (i) whether such Offered Note is a Fixed Rate Note or a
Floating Rate Note; (ii) the price (expressed as a percentage of the aggregate
principal amount thereof) at which such Offered Note will be issued (the "Issue
Price"); (iii) the date on which such Offered Note will be issued (the "Original
Issue Date"); (iv) the date on which such Offered Note will mature (the "Stated
Maturity"); (v) if such Offered Note is a Fixed Rate Note, the rate per annum at
which such Offered Note will bear interest, if any, and the Interest Payment
Dates; (vi) if such Offered Note is a Floating Rate Note, the Base Rate, the
Initial Interest Rate, the Interest Reset Period, Interest Reset Dates, the
Interest Payment Dates, the Index Maturity, the Maximum Interest Rate, if any,
the Minimum Interest Rate, if any, the Spread or Spread Multiplier, if any (all
as defined below), and any other terms relating to the particular method of
calculating the interest rate for such Offered Note; (vii) whether such Offered
Note may be redeemed at the option of the Company prior to Stated Maturity as
described under "Redemption" below and, if so, the provisions relating to such
redemption; (viii) any sinking fund or other mandatory redemption provisions
applicable to such Offered Note, and any provisions for the repayment or
purchase by the Company of such Offered Note at the option of the Holder; (ix)
the terms, if any, under which the Offered Note may be convertible into Common
Stock; and (x) any other terms of such Offered Note not inconsistent with the
provisions of the Indenture under which such Offered Note will be issued.
 
                                       S-2
<PAGE>   3
 
     "Business Day" with respect to any Offered Note means any day, other than a
Saturday or Sunday, which is (i) not a day on which banking institutions or
trust companies in the State of New York or the city in which is located any
office or agency maintained for the payment of principal of or premium, if any,
or interest on such Offered Note are authorized or required by law, regulation
or executive order to remain closed and (ii) if such Offered Note is a LIBOR
Note (as defined below), a London Banking Day. "London Banking Day" with respect
to any Offered Note means any day on which dealings in deposits in U.S. dollars
are transacted in the London interbank market.
 
     The Indenture does not contain any covenants or other provisions that
specifically are intended to afford Holders of the Offered Notes special
protection in the event of a highly leveraged transaction.
 
PAYMENT OF PRINCIPAL AND INTEREST
 
     Payments of interest on the Offered Notes (other than interest payable at
Maturity) will be made, except as provided below, by check mailed to the Holders
of such Offered Notes (which, in the case of Global Notes representing
Book-Entry Notes, will be a nominee of the Depositary, as hereinafter defined)
as of the Regular Record Date (as defined below) for each Interest Payment Date;
provided, however, that if the Original Issue Date of an Offered Note is after a
Regular Record Date and before the corresponding Interest Payment Date, interest
for the period from and including the Original Issue Date for such Offered Note
to but excluding such Interest Payment Date will be paid on the next succeeding
Interest Payment Date to the Holder of such Offered Note on the related Regular
Record Date.
 
     Unless otherwise specified in the applicable Pricing Supplement, the
principal of the Offered Notes and any premium and interest thereon payable at
Maturity will be paid upon surrender thereof at the principal corporate trust
office of The Bank of New York in New York, New York.
 
     If, with respect to any Offered Note that is a Fixed Rate Note, any
Interest Payment Date, redemption date, or Stated Maturity falls on a day that
is not a Business Day, the required payment of principal, premium, if any,
and/or interest will be made on the next succeeding Business Day as if made on
the date such payment was due, and no interest will accrue on such payment for
the period from and after such Interest Payment Date, or Stated Maturity, as the
case may be, to the date of such payment on the next succeeding Business Day. If
any Interest Payment Day for any Floating Rate Note (other than the Stated
Maturity), would otherwise be a day that is not a Business Day, such Interest
Payment Date will be postponed to the next succeeding day that is a Business
Day, except that in the case of a Floating Rate Note that is a LIBOR Note, if
such Business Day falls in the next succeeding calendar month, such Interest
Payment Date will be the immediately preceding Business Day. If the Stated
Maturity of a Floating Rate Note falls on a day that is not a Business Day, the
required payment of principal, premium, if any, and/or interest will be made on
the next succeeding Business Day as if made on the date such payment was due,
and no interest shall accrue on such payment for the period from and after the
Stated Maturity to the date of such payment on the next succeeding Business Day.
 
     The "Regular Record Date" with respect to any Interest Payment Date for a
Floating Rate Note will be the date (whether or not a Business Day) fifteen
calendar days next preceding such Interest Payment Date, and for a Fixed Rate
Note (unless otherwise specified in the applicable Pricing Supplement) will be
the March 1 or September 1 (whether or not a Business Day) next preceding an
Interest Payment Date for Fixed Rate Notes.
 
FIXED RATE NOTES
 
     Each Fixed Rate Note will bear interest from its Original Issue Date at the
rate per annum stated on the face thereof until the principal amount thereof is
paid or made available for payment. Unless otherwise set forth in the applicable
Pricing Supplement, interest on each Fixed Rate Note will be payable
semiannually in arrears on each March 15 and September 15 (each such date, an
"Interest Payment Date") and at Maturity. Each payment of interest in respect of
an Interest Payment Date shall include interest accrued through the day before
such Interest Payment Date. Interest on Fixed Rate Notes will be computed on the
basis of a 360-day year of twelve 30-day months.
 
                                       S-3
<PAGE>   4
 
FLOATING RATE NOTES
 
     Each Floating Rate Note will bear interest from its Original Issue Date to
the first Interest Reset Date for such Offered Note at the Initial Interest Rate
set forth on the face thereof and in the applicable Pricing Supplement.
Thereafter, the interest rate on such Offered Note for each Interest Reset
Period will be determined by reference to an interest rate basis (the "Base
Rate"), plus or minus the Spread, if any, or multiplied by the Spread
Multiplier, if any. The "Spread" is the number of basis points (one basis point
equals one one-hundredth of a percentage point) that may be specified in the
applicable Pricing Supplement as being applicable to such Offered Note, and the
"Spread Multiplier" is the percentage that may be specified in the applicable
Pricing Supplement as being applicable to such Offered Note. The applicable
Pricing Supplement will designate one of the following Base Rates as applicable
to a Floating Rate Note: (i) the Commercial Paper Rate (a "Commercial Paper Rate
Note"); (ii) LIBOR (a "LIBOR Note"); (iii) the Treasury Rate (a "Treasury Rate
Note"); or (iv) such other Base Rate as is set forth in such Pricing Supplement
and in such Offered Note. As used herein, the "Index Maturity" for any Offered
Note is the period of maturity of the instrument or obligation from which the
Base Rate is calculated; "H.15(519)" means the publication entitled "Statistical
Release H.15(519), Selected Interest Rates" or any successor publication,
published by the Board of Governors of the Federal Reserve System; and
"Composite Quotations" means the daily statistical release entitled "Composite
3:30 p.m. Quotations for U.S. Government Securities" published by the Federal
Reserve Bank of New York.
 
     As specified in the applicable Pricing Supplement, a Floating Rate Note may
also have either or both of the following (in each case expressed as a rate per
annum on a simple interest basis): (i) a maximum limitation, or ceiling, on the
rate at which interest may accrue during any interest period ("Maximum Interest
Rate") and (ii) a minimum limitation, or floor, on the rate at which interest
may accrue during any interest period ("Minimum Interest Rate"). In addition to
any Maximum Interest Rate that may be applicable to any Floating Rate Note, the
interest rate on a Floating Rate Note will in no event be higher than the
maximum rate, if any, permitted by Virginia law, as the same may be modified by
United States law of general application. Under Virginia law currently in
effect, a business corporation may not use usury or the taking of more than the
lawful interest rate as a defense to any proceeding to recover damages on, or
enforce payment of, any obligation executed or effected by such corporation.
 
     The Company will appoint, and enter into an agreement with, an agent (the
"Calculation Agent") to calculate interest rates on Floating Rate Notes. Unless
otherwise specified in the applicable Pricing Supplement, The Bank of New York
will be the Calculation Agent. All determinations of interest rates by the
Calculation Agent shall, in the absence of manifest error, be conclusive for all
purposes and binding upon the Holders of the Floating Rate Notes.
 
     The interest rate on each Floating Rate Note will be reset daily, weekly,
monthly, quarterly, semiannually or annually (such period being the "Interest
Reset Period" for such Offered Note, and the first day of each Interest Reset
Period being an "Interest Reset Date"), as specified in the applicable Pricing
Supplement. Unless otherwise specified in the applicable Pricing Supplement, the
Interest Reset Dates will be, in the case of Floating Rate Notes that reset
daily, each Business Day; in the case of Floating Rate Notes (other than
Treasury Rate Notes) that reset weekly, Wednesday of each week; in the case of
Treasury Rate Notes that reset weekly, Tuesday of each week (except as provided
below under "Treasury Rate Notes"); in the case of Floating Rate Notes that
reset monthly, the third Wednesday of each month; in the case of Floating Rate
Notes that reset quarterly, the third Wednesday of March, June, September and
December of each year; in the case of Floating Rate Notes that reset
semiannually, the third Wednesday of each of two months of each year specified
in the applicable Pricing Supplement; and, in the case of Floating Rate Notes
that reset annually, the third Wednesday of one month of each year specified in
the applicable Pricing Supplement; provided, however, that the interest rate in
effect for the ten days immediately prior to Maturity will be that in effect on
the tenth day preceding Maturity. If an Interest Reset Date for any Floating
Rate Note would otherwise be a day that is not a Business Day, such Interest
Reset Date will be postponed to the next succeeding Business Day, except that,
in the case of a
 
                                       S-4
<PAGE>   5
 
LIBOR Note, if such Business Day is in the next succeeding calendar month, such
Interest Reset Date shall be the immediately preceding Business Day.
 
     Unless otherwise specified in the applicable Pricing Supplement, interest
payable in respect of Floating Rate Notes will be the accrued interest from and
including the Original Issue Date or the last date to which interest has been
paid, as the case may be, to but excluding the next succeeding Interest Payment
Date. In the case of a Floating Rate Note that resets daily or weekly, interest
payable will be the accrued interest from and including the Original Issue Date
or the last date to which interest has been accrued and paid, as the case may
be, to but excluding the Regular Record Date next preceding the applicable
Interest Payment Date, except that, at Maturity, interest payable will include
interest accrued to but excluding the date of Maturity.
 
     With respect to a Floating Rate Note, accrued interest will be calculated
by multiplying the principal amount of such Offered Note by an accrued interest
factor. Such accrued interest factor will be computed by adding the interest
factors calculated for each day in the period for which accrued interest is
being calculated. Unless otherwise specified in the applicable prospectus
supplement, the interest factor (expressed as a decimal calculated to seven
decimal places without rounding) for each such day is computed by dividing the
interest rate in effect on such day by 360, in the case of Commercial Paper Rate
Notes and LIBOR Notes, or by the actual number of days in the year in the case
of Treasury Rate Notes. For purposes of making the foregoing calculation, the
interest rate in effect on any Interest Reset Date will be the applicable rate
as reset on such date.
 
     Unless otherwise specified in the applicable Pricing Supplement, all
percentages resulting from any calculation of the rate of interest on a Floating
Rate Note will be rounded, if necessary, to the nearest 1/100,000 of 1%
(.0000001), with five one-millionths of a percentage point rounded upward, and
all dollar amounts used in or resulting from such calculation on Floating Rate
Notes will be rounded to the nearest one-hundredth of a cent (with .005 of a
cent being rounded upward).
 
     Unless otherwise indicated in the applicable Pricing Supplement and except
as provided below, interest will be payable, in the case of Floating Rate Notes
that reset daily, weekly or monthly, on the third Wednesday of each month or on
the third Wednesday of March, June, September and December of each year, as
specified in the applicable Pricing Supplement; in the case of Floating Rate
Notes that reset quarterly, on the third Wednesday of March, June, September and
December of each year; in the case of Floating Rate Notes that reset
semiannually, on the third Wednesday of each of two months of each year
specified in the Pricing Supplement; and in the case of Floating Rate Notes that
reset annually, on the third Wednesday of one month of each year specified in
the applicable Pricing Supplement (each such day being an "Interest Payment
Date").
 
     Upon the request of the Holder of any Floating Rate Note, the Calculation
Agent for such Offered Note will provide the interest rate then in effect and,
if determined, the interest rate that will become effective on the next Interest
Reset Date with respect to such Floating Rate Note.
 
COMMERCIAL PAPER RATE NOTES
 
     Each Commercial Paper Rate Note will bear interest for each Interest Reset
Period at an interest rate calculated with reference to the Commercial Paper
Rate and the Spread or Spread Multiplier, if any, specified in such Offered Note
and in the applicable Pricing Supplement.
 
     Unless otherwise specified in the applicable Pricing Supplement, the
"Commercial Paper Rate" for each Interest Reset Period will be determined by the
Calculation Agent on the Calculation Date (as defined below) and will be the
Money Market Yield (as defined below) as of the second Business Day prior to the
related Interest Reset Date (a "Commercial Paper Rate Determination Date") of
the rate for commercial paper having the Index Maturity specified in the
applicable Pricing Supplement, as such rate shall be published in H.15(519)
under the heading "Commercial Paper." In the event that such rate is not
published prior to 9:00 a.m., New York City time, on the Calculation Date, then
the "Commercial Paper Rate" for such Interest Reset Period will be the Money
Market Yield as of such Commercial Paper
 
                                       S-5
<PAGE>   6
 
Rate Determination Date of the rate for commercial paper of the specified Index
Maturity as published in Composite Quotations under the heading "Commercial
Paper." If by 9:00 a.m., New York City time, on the Calculation Date such rate
is not yet published in either H.15(519) or Composite Quotations, then the
"Commercial Paper Rate" for such Interest Reset Period shall be the Money Market
Yield of the arithmetic mean of the offered rates, as of 11:00 a.m., New York
City time, on such Commercial Paper Rate Determination Date of three leading
dealers in commercial paper in The City of New York selected by the Calculation
Agent, in its discretion, for commercial paper of the specified Index Maturity
placed for an industrial issuer whose bonds are rated "AA", or the equivalent,
by a nationally recognized rating agency; provided, however, that if the dealers
selected as aforesaid are not quoting offered rates described in this sentence,
the "Commercial Paper Rate" for such Interest Reset Period will be deemed to be
the same as the Commercial Paper Rate for the immediately preceding Interest
Reset Period (or, if there was no such Interest Reset Period, the Initial
Interest Rate).
 
     "Money Market Yield" will be a yield calculated in accordance with the
following formula:
 
<TABLE>
<S>                    <C>                 
                            D X 360
 Money Market Yield =  ------------------  X 100
                         360 - (D X M)
</TABLE>
 
where "D" refers to the applicable per annum rate for commercial paper quoted on
a bank discount basis and expressed as a decimal, and "M" refers to the actual
number of days in the specified Index Maturity.
 
     The "Calculation Date" pertaining to any Commercial Paper Rate
Determination Date shall be the tenth calendar day after such Commercial Paper
Rate Determination Date or, if such day is not a Business Day, the next
succeeding Business Day.
 
LIBOR NOTES
 
     Each LIBOR Note will bear interest for each Interest Reset Period at an
interest rate calculated with reference to LIBOR and the Spread or Spread
Multiplier, if any, specified in such Offered Note and in the applicable Pricing
Supplement.
 
     Unless otherwise indicated in the applicable Pricing Supplement, "LIBOR"
means the determination by the Calculation Agent in accordance with the
following provisions:
 
          (i) With respect to an Interest Determination Date relating to a LIBOR
     Note, either, as specified in the applicable Pricing Supplement: (a) the
     arithmetic mean of the offered rates for deposits in U.S. dollars for the
     period of the Index Maturity specified in the applicable Pricing
     Supplement, commencing on the second London Business Day immediately
     following such Interest Determination Date, which appear on the Reuters
     Screen LIBO Page as of 11:00 a.m., London time, on the Interest
     Determination Date, if at least two such offered rates appear on the
     Reuters Screen LIBO Page ("LIBOR Reuters"), or (b) the rate for deposits in
     U.S. dollars having the Index Maturity designated in the applicable Pricing
     Supplement, commencing on the second London Business Day immediately
     following that Interest Determination Date, that appears on the Telerate
     Page 3750 as of 11:00 a.m., London time, on that Interest Determination
     Date ("LIBOR Telerate"). Unless otherwise indicated in the applicable
     Pricing Supplement, "Reuters Screen LIBO Page" means the display designated
     as Page "LIBO" on the Reuters Monitor Money Rate Service (or such other
     page as may replace the LIBO page on that service for the purpose of
     displaying London interbank offered rates of major banks). "Telerate Page
     3750" means the display designated as page "3750" on the Telerate Service
     (or such other page as may replace the 3750 page on that service or such
     other service or services as may be nominated by the British Bankers'
     Association for the purpose of displaying London interbank offered rates
     for U.S. dollar deposits). If neither LIBOR Reuters nor LIBOR Telerate is
     specified in the applicable Pricing Supplement, LIBOR will be determined as
     if LIBOR Telerate had been specified. In the case where (a) above applies,
     if fewer than two offered rates appear on the Reuters Screen LIBO Page, or,
     in the case where (b) above applies if no rate appears on the Telerate Page
     3750, as applicable, LIBOR in respect of that Interest Determination Date
     will be determined as if the parties had specified the rate described in
     (ii) below.
 
                                       S-6
<PAGE>   7
 
          (ii) With respect to an Interest Determination Date on which this
     provision applies, LIBOR will be determined on the basis of the rates at
     which deposits in U.S. dollars having the Index Maturity designated in the
     applicable Pricing Supplement are offered at approximately 11:00 a.m.,
     London time, on such Interest Determination Date by four major banks
     ("Reference Banks") in the London interbank market selected by the
     Calculation Agent to prime banks in the London interbank market commencing
     on the second London Business Day immediately following such Interest
     Determination Date and in a principal amount of not less than U.S.
     $1,000,000 that is representative for a single transaction in such market
     at such time. The Calculation Agent will request the principal London
     office of each of the Reference Banks to provide a quotation of its rate.
     If at least two such quotations are provided, LIBOR for such Interest
     Determination Date will be the arithmetic mean of such quotations. If fewer
     than two quotations are provided, LIBOR for such Interest Determination
     Date will be the arithmetic mean of the rates quoted at approximately 11:00
     a.m., New York City time, on such Interest Determination Date by three
     major banks (which may include the Agents) in The City of New York selected
     by Calculation Agent for loans in U.S. dollars to leading European banks
     having the specified Index Maturity designated in the applicable Pricing
     Supplement commencing on the second London Business Day immediately
     following such Interest Determination Date and in a principal amount equal
     to an amount of not less than U.S. $1,000,000 that is representative for a
     single transaction in such market at such time; provided, however, that if
     the banks selected as aforesaid by the Calculation Agent are not quoting as
     mentioned in this sentence, LIBOR will be LIBOR then in effect on such
     Interest Determination Date.
 
TREASURY RATE NOTES
 
     Each Treasury Rate Note will bear interest for each Interest Reset Period
at an interest rate calculated with reference to the Treasury Rate and the
Spread or Spread Multiplier, if any, specified in such Offered Note and in the
applicable Pricing Supplement.
 
     Unless otherwise specified in the applicable Pricing Supplement, the
"Treasury Rate" for each Interest Reset Period will be determined by the
Calculation Agent on the Calculation Date (as defined below) and will be the
rate for the auction held on the Treasury Rate Determination Date (as defined
below) for such Interest Reset Period of direct obligations of the United States
("Treasury bills") having the Index Maturity specified in the applicable Pricing
Supplement, as such rate shall be published in H.15(519) under the heading "U.S.
Government Securities -- Treasury bills -- auction average (investment)" or, in
the event that such rate is not published prior to 9:00 a.m., New York City
time, on the Calculation Date, the auction average rate (expressed as a bond
equivalent on the basis of a year of 365 or 366 days, as applicable, and applied
on a daily basis) on such Treasury Rate Determination Date as otherwise
announced by the United States Department of the Treasury. In the event that the
results of the auction of Treasury bills having the specified Index Maturity are
not published or reported as provided above by 9:00 a.m., New York City time, on
such Calculation Date, or if no such auction is held on such Treasury Rate
Determination Date, then the "Treasury Rate" for such Interest Reset Period will
be calculated by the Calculation Agent and will be a yield to maturity
(expressed as a bond equivalent on the basis of a year of 365 or 366 days, as
applicable, and applied on a daily basis) of the arithmetic mean of the
secondary market bid rates, as of approximately 3:30 p.m., New York City time,
on such Treasury Rate Determination Date, of three leading primary United States
Government securities dealers selected by such Calculation Agent for the issue
of Treasury bills with a remaining maturity closest to the specified Index
Maturity; provided, however, that if the dealers selected as aforesaid by the
Calculation Agent are not quoting bid rates as described in this sentence, then
the "Treasury Rate" for such Interest Reset Period will be deemed to be the same
as the Treasury Rate for the immediately preceding Interest Reset Period (or, if
there was no such Interest Reset Period, the Initial Interest Rate).
 
     The "Treasury Rate Determination Date" for each Interest Reset Period will
be the day of the week in which the Interest Reset Date for such Interest Reset
Period falls on a day on which Treasury bills would normally be auctioned. At
the date of this Prospectus Supplement, Treasury bills are normally sold at
auction on Monday of each week, unless that day is a legal holiday, in which
case the auction is normally
 
                                       S-7
<PAGE>   8
 
held on the following Tuesday, except that such auction may be held on the
preceding Friday. If, as the result of a legal holiday, an auction is so held on
the preceding Friday, such Friday will be the Treasury Rate Determination Date
pertaining to the Interest Reset Period commencing in the next succeeding week.
If an auction date shall fall on any day that would otherwise be an Interest
Reset Date for a Treasury Rate Note, then such Interest Reset Date shall instead
be the Business Day immediately following such auction date.
 
     The "Calculation Date" pertaining to any Treasury Rate Determination Date
shall be the tenth calendar day after such Treasury Rate Determination Date or,
if such day is not a Business Day, the next succeeding Business Day.
 
REDEMPTION
 
     The Pricing Supplement relating to each Offered Note will indicate either
that such Offered Note cannot be redeemed prior to Stated Maturity or that such
Offered Note will be redeemable at the option of the Company in whole or in
part, on any date on or after the date designated as the "Initial Redemption
Date" in such Pricing Supplement, at prices declining from a specified premium,
if any, to par, together with accrued interest to the date of redemption.
 
     The Pricing Supplement relating to each Offered Note will also specify any
sinking fund or other mandatory redemption provisions applicable to such Offered
Note, and any provisions for the repayment or purchase by the Company of such
Offered Note at the option of the Holder.
 
     Reference is made to the information contained under "Description of the
Unsecured Notes -- Redemption" in the accompanying Prospectus.
 
BOOK-ENTRY NOTES
 
     Except under the circumstances described below, the Offered Notes will be
issued in whole or in part in the form of one or more Global Notes that will be
deposited with, or on behalf of, The Depository Trust Company, New York, New
York ("DTC"), or such other depositary as may be subsequently designated (the
"Depositary"), and registered in the name of the Depositary.
 
     Upon issuance, all Fixed Rate Book-Entry Notes having the same Original
Issue Date, interest rate, redemption provisions, provisions for repayment or
purchase by the Company at the option of the Holder and Stated Maturity will be
represented by one or more Global Notes, and all Floating Rate Book-Entry Notes
having the same Original Issue Date, Initial Interest Rate, Base Rate, Interest
Reset Period, Interest Reset Dates, Interest Payment Dates, Index Maturity,
Spread or Spread Multiplier, if any, redemption provisions, provisions for
repayment or purchase by the Company at the option of the Holder, Minimum
Interest Rate, if any, Maximum Interest Rate, if any, and Stated Maturity will
be represented by one or more Global Notes. Except as set forth below,
Book-Entry Notes represented by a Global Note will not be exchangeable for
Certificated Notes and will not otherwise be issuable as Certificated Notes.
 
     So long as the Depositary, or its nominee, is the registered owner of a
Global Note, such Depositary or such nominee, as the case may be, will be
considered the sole holder of the individual Book-Entry Notes represented by
such Global Note for all purposes under the Indenture. Payments of principal of
and premium, if any, and any interest on individual Book-Entry Notes represented
by a Global Note will be made to the Depositary or its nominee, as the case may
be, as the Holder of such Global Note. Except as set forth below, owners of
beneficial interests in a Global Note will not be entitled to have any of the
individual Book-Entry Notes represented by such Global Note registered in their
names, will not receive or be entitled to receive physical delivery of any such
Book-Entry Notes and will not be considered the Holders thereof under the
Indenture, including, without limitation, for purposes of consenting to any
amendment thereof or supplement thereto.
 
     If the Depositary is at any time unwilling or unable to continue as
depositary and a successor depositary is not appointed, the Company will issue
individual Certificated Notes in exchange for the Global Note or Notes
representing the corresponding Book-Entry Notes. In addition, the Company may at
 
                                       S-8
<PAGE>   9
 
any time and in its sole discretion determine not to have any Offered Notes
represented by one or more Global Notes and, in such event, will issue
individual Certificated Notes in exchange for the Global Notes representing the
corresponding Book-Entry Notes. In any such instance, an owner of a Book-Entry
Note represented by a Global Note will be entitled to physical delivery of
individual Certificated Notes equal in principal amount to such Book-Entry Note
and to have such Certificated Notes registered in its name. Individual
Certificated Notes so issued will be issued as registered Notes in
denominations, unless otherwise specified by the Company, of $1,000 and integral
multiples thereof.
 
     DTC has confirmed to the Company and the Agents the following information:
 
          1. DTC will act as securities depository for the Global Notes. The
     Offered Notes will be issued as fully-registered securities registered in
     the name of Cede & Co. (DTC's partnership nominee). One fully-registered
     Global Note will be issued for each issue of the Offered Notes, each in the
     aggregate principal amount of such issue, and will be deposited with DTC.
 
          2. DTC is a limited-purpose trust company organized under the New York
     Banking Law, a "banking organization" within the meaning of the New York
     Banking Law, a member of the Federal Reserve System, a "clearing
     corporation" within the meaning of the New York Uniform Commercial Code,
     and a "clearing agency" registered pursuant to the provisions of Section
     17A of the Securities Exchange Act of 1934. DTC holds securities that its
     participants ("Participants") deposit with DTC. DTC also facilitates the
     settlement among Participants of securities transactions, such as transfers
     and pledges, in deposited securities through electronic computerized
     book-entry changes in Participants' accounts, thereby eliminating the need
     for physical movement of securities certificates. Direct Participants
     ("Direct Participants") include securities brokers and dealers, banks,
     trust companies, clearing corporations, and certain other organizations.
     DTC is owned by a number of its Direct Participants and by the New York
     Stock Exchange, Inc., the American Stock Exchange, Inc., and the National
     Association of Securities Dealers, Inc. Access to the DTC system is also
     available to others such as securities brokers and dealers, banks, and
     trust companies that clear through or maintain a custodial relationship
     with a Direct Participant, either directly or indirectly ("Indirect
     Participants"). The Rules applicable to DTC and its Participants are on
     file with the Securities and Exchange Commission.
 
          3. Purchases of Offered Notes under the DTC system must be made by or
     through Direct Participants, which will receive a credit for the Offered
     Notes on DTC's records. The ownership interest of each actual purchaser of
     each Offered Note ("Beneficial Owner") is in turn to be recorded on the
     Direct and Indirect Participants' records. Beneficial Owners will not
     receive written confirmation from DTC of their purchase, but Beneficial
     Owners are expected to receive written confirmations providing details of
     the transaction, as well as periodic statements of their holdings, from the
     Direct or Indirect Participant through which the Beneficial Owner entered
     into the transaction. Transfers of ownership interests in the Offered Notes
     are to be accomplished by entries made on the books of Participants acting
     on behalf of Beneficial Owners. Beneficial Owners will not receive
     certificates representing their ownership interest in Offered Notes, except
     in the event that use of the book-entry system for the Offered Notes is
     discontinued.
 
          4. To facilitate subsequent transfers, all Offered Notes deposited by
     Participants with DTC are registered in the name of DTC's partnership
     nominee, Cede & Co. The deposit of Offered Notes with DTC and their
     registration in the name of Cede & Co. effect no change in beneficial
     ownership. DTC has no knowledge of the actual Beneficial Owners of the
     Offered Notes; DTC's records reflect only the identity of the Direct
     Participants to whose accounts such Offered Notes are credited, which may
     or may not be the Beneficial Owners. The Participants will remain
     responsible for keeping account of their holdings on behalf of their
     customers.
 
          5. Conveyance of notices and other communications by DTC to Direct
     Participants, by Direct Participants to Indirect Participants, and by
     Direct Participants and Indirect Participants to Beneficial Owners will be
     governed by arrangements among them, subject to any statutory or regulatory
     requirements as may be in effect from time to time.
 
                                       S-9
<PAGE>   10
 
           6. Redemption notices shall be sent to Cede & Co. If less than all of
     the Offered Notes within an issue are being redeemed, DTC's practice is to
     determine by lot the amount of the interest of each Direct Participant in
     such issue to be redeemed.
 
           7. Neither DTC nor Cede & Co. will consent or vote with respect to
     Offered Notes. Under its usual procedures, DTC mails an Omnibus Proxy to
     the Company as soon as possible after the record date. The Omnibus Proxy
     assigns Cede & Co.'s consenting or voting rights to those Direct
     Participants to whose accounts the Offered Notes are credited on the record
     date (identified in a listing attached to the Omnibus Proxy).
 
           8. Principal and interest payments on the Offered Notes will be made
     to DTC. DTC's practice is to credit Direct Participants' accounts on the
     payment date in accordance with their respective holdings shown on DTC's
     records unless DTC has reason to believe that it will not receive payment
     on the payment date. Payments by Participants to Beneficial Owners will be
     governed by standing instructions and customary practices, as is the case
     with securities held for the accounts of customers in bearer form or
     registered in "street name," and will be the responsibility of such
     Participant and not of DTC, the Indenture Trustee, or the Company, subject
     to any statutory or regulatory requirements as may be in effect from time
     to time. Payment of principal and interest to DTC is the responsibility of
     the Company or the Indenture Trustee, disbursements of such payments to
     Direct Participants shall be the responsibility of DTC, and disbursement of
     such payments to the Beneficial Owners shall be the responsibility of
     Direct and Indirect Participants.
 
           9. DTC may discontinue providing its services as securities
     depository with respect to the Offered Notes at any time by giving
     reasonable notice to the Company or the Indenture Trustee. Under such
     circumstances, in the event that a successor securities depository is not
     obtained, Certificated Notes are required to be printed and delivered.
 
          10. The Company may decide to discontinue use of the system of
     book-entry transfers through DTC (or a successor securities depository). In
     that event, Certificated Notes will be printed and delivered.
 
          11. The information in this section concerning DTC and DTC's
     book-entry system has been obtained from sources that the Company believes
     to be reliable, but the Company takes no responsibility for the accuracy
     thereof.
 
     NONE OF THE COMPANY, THE INDENTURE TRUSTEE OR ANY AGENT FOR PAYMENT ON OR
REGISTRATION OF TRANSFER OR EXCHANGE OF SUCH OFFERED NOTES WILL HAVE ANY
RESPONSIBILITY OR LIABILITY FOR ANY ASPECT OF THE RECORDS RELATING TO OR
PAYMENTS MADE ON ACCOUNT OF BENEFICIAL INTERESTS IN SUCH GLOBAL NOTE OR FOR
MAINTAINING, SUPERVISING OR REVIEWING ANY RECORDS RELATING TO SUCH BENEFICIAL
INTERESTS.
 
             CERTAIN UNITED STATES FEDERAL INCOME TAX CONSEQUENCES
 
     The following summary describes certain United States federal income tax
consequences of the ownership of Offered Notes as of the date hereof. Except
where noted, it deals only with Offered Notes held as capital assets by initial
purchasers and does not deal with special situations, such as those of dealers
in securities, financial institutions, individual retirement or other
tax-deferred accounts, tax-exempt organizations, insurance companies, persons
who hold Offered Notes as a hedge against currency risk, persons who hold
Offered Notes as part of a straddle with other investments or who have otherwise
hedged the risk of ownership of the Offered Notes, or United States Holders (as
defined below) whose "functional currency" is not the U.S. dollar. Persons
considering the purchase, ownership or disposition of Offered Notes should
consult their own tax advisors concerning the federal income tax consequences in
light of their particular situations as well as any consequences arising under
the laws of any other taxing jurisdiction. Furthermore, the discussion below is
based upon provisions of the Internal Revenue Code of 1986, as amended (the
"Code"), and regulations, rulings and judicial decisions
 
                                      S-10
<PAGE>   11
 
thereunder as of the date hereof, and such authorities may be repealed, revoked
or modified so as to result in federal income tax consequences different from
those discussed below.
 
UNITED STATES HOLDERS
 
     As used herein, a "United States Holder" of an Offered Note means a holder
that is a citizen or resident of the United States, a corporation, partnership
or other entity created or organized in or under the laws of the United States
or any political subdivision thereof, or an estate or trust the income of which
is subject to United States federal income taxation regardless of its source. A
"Non-United States Holder" is a holder that is not a United States Holder.
 
     Payments of Interest.  Except as set forth below, interest on an Offered
Note will generally be taxable to a United States Holder as ordinary income at
the time it is paid or accrued in accordance with the holder's method of
accounting for federal income tax purposes.
 
     Original Issue Discount.  An Offered Note will be treated as having been
issued with "original issue discount" ("OID") if the excess of its "stated
redemption price at maturity" over its "issue price" (for these purposes the
first price at which a substantial amount of the Offered Notes is sold to the
public) equals or exceeds a de minimis amount (0.25 percent of the stated
redemption price at maturity multiplied by the number of complete years to
maturity). (Offered Notes issued with OID shall be referred to as "OID Notes.")
For this purpose, "stated redemption price at maturity" means the sum of all
payments under the Offered Notes other than "qualified stated interest"
payments. In general, "qualified stated interest" includes stated interest that
is unconditionally payable at least annually at a single fixed rate or at a
single qualified floating rate or objective rate on a "variable rate debt
instrument." In general, an Offered Note will be a "variable rate debt
instrument" if (i) the issue price of an Offered Note does not exceed its
principal amount by more than the lesser of (a) 15 percent of the principal
amount or (b) .015 multiplied by the product of the principal amount and the
number of complete years to maturity and (ii) the interest rate on the
instrument is comprised of one or more qualified floating rates, a single fixed
rate and one or more qualified floating rates, a single objective rate, or a
single fixed rate and a single objective rate that is a qualified inverse
floating rate. (Qualified stated interest also includes interest calculated at
certain other variable rates on variable rate debt instruments.)
 
     Unless the Offered Notes are issued with stated interest that is entirely
qualified stated interest, all payments or portions of payments that do not
constitute qualified stated interest would constitute a portion of the stated
redemption price at maturity of the Offered Notes. Any such Offered Notes may
therefore possess OID subject to the consequences described herein, even if the
issue price of the Offered Notes equals (or exceeds) the principal amount of
such Notes.
 
     United States Holders are required to include OID in income in advance of
the receipt of some or all of the related cash payments. For OID Notes having a
term in excess of one year, OID will be included in income currently as interest
as it accrues over the life of the Offered Note under a formula based upon the
compounding of interest at a rate that provides for a constant yield to
maturity. Under this formula, United States Holders must include in income
increasingly greater amounts of OID in each successive accrual period.
 
     The Company is required to report the amount of OID accrued on Offered
Notes held of record by persons other than corporations and other exempt
holders; however, the amount reported by the Company may not equal the amount of
OID required to be included in income by a holder that is not an initial
purchaser of the Offered Notes or who does not purchase the Offered Notes at
their issue price.
 
     In the event that the Company determines to issue Offered Notes that are
OID Notes (including certain Offered Notes not denominated in U.S. dollars or
providing for contingent payments), and the federal income tax consequences of
such features would be material to United States Holders, notice thereof and
additional information will be provided in the appropriate supplement hereto.
 
     Short-Term Notes.  In the case of Offered Notes with a maturity of one year
("Short-Term Notes"), all payments (including all stated interest however
calculated) will be included in the stated redemption
 
                                      S-11
<PAGE>   12
 
price at maturity and, thus, United States Holders will be taxable on OID in
lieu of stated interest. Accrual method United Stated Holders and certain other
United States Holders, including banks and dealers in securities, are required
to include OID on a Short-Term Note in income as it accrues either on a
straight-line basis or, if the holder so elects, under the constant yield
method. In general, individuals and other cash method United States Holders are
not required to include OID in income as it accrues unless they elect to do so.
In the case of an individual or cash method holder who does not elect to include
OID on a Short-Term Note in income as it accrues, however, any gain realized on
the disposition of a Short-Term Note will be treated as ordinary income to the
extent of the OID accrued on a straight-line basis (or, if elected, on a
constant yield basis). Furthermore, such a non-electing holder will be required
to defer deductions for a portion of the holder's interest expenses with respect
to any indebtedness incurred or maintained to purchase or carry such Short-Term
Notes, in an amount not exceeding the deferred interest income, until the
deferred interest income is realized. In the case of a holder who includes OID
on a Short-Term Note in income as it accrues, the amount so included will be
added to the holder's tax basis in the Short-Term Note.
 
     Accrual method United States Holders (including holders that are not
initial purchasers) may elect to include all interest that accrues on an Offered
Note by using the constant yield method. For this purpose, "interest" includes
both OID (including OID on Short-Term Notes and de minimis OID) and stated
interest (as such may be adjusted by amortization of premium and acquisition
premium, see "Amortization of Premium" below). If the holder so elects with
respect to an Offered Note that has been purchased at a premium (as opposed to
merely an acquisition premium), this election is also treated as an election
under the amortizable bond premium provisions, described below, and the electing
holder will be required to amortize bond premium currently for all his other
debt instruments with amortizable bond premium. This election is to be made in
the taxable year in which the holder acquired the Offered Note and may not be
revoked without the consent of the Internal Revenue Service ("IRS").
 
     Amortization of Premium.  An Offered Note may be considered to have been
issued at a "premium" to the extent that the United States Holder's tax basis in
the Offered Note immediately after purchase exceeds its principal amount. A
holder generally may elect to amortize the premium over the remaining term of
the Offered Note on a constant yield method. The amount amortized in any year
will be treated as a reduction of the holder's interest income from the Offered
Note. Premium on an Offered Note held by a holder that does not make such an
election will decrease the gain or increase the loss otherwise recognized on
disposition of the Offered Note.
 
     An Offered Note purchased for an amount that exceeds its issue price but
not the principal amount of the Offered Note will be issued with "acquisition
premium." In that event, the amount of OID otherwise includable on the Offered
Note would be reduced over the term of the Offered Note through amortization of
the acquisition premium. Alternatively, a United States Holder may elect to
compute OID accruals by using his purchase price, rather than the issue price,
together with the constant yield method for accruing the discount. Such an
election may not be revoked unless approved by the IRS.
 
     Sale, Exchange and Retirement of Offered Notes.  Upon the sale, exchange or
retirement of an Offered Note, a United States Holder will recognize gain or
loss equal to the difference between the amount realized upon the sale, exchange
or retirement and the adjusted tax basis of the Offered Note. A United States
Holder's tax basis in an Offered Note will, in general, equal the United States
Holder's cost for the Offered Note, increased by OID included in income and
reduced by any amortized premium and any cash payments on the Offered Note other
than qualified stated interest payments. Except with respect to certain
Short-Term Notes, as described in "Short-Term Notes" above, such gain or loss
will be capital gain or loss and will be long-term capital gain or loss if the
Offered Note had been held for more than one year at the time of disposition.
Net capital gains of individuals are, under certain circumstances, taxed at
lower rates than items of ordinary income. A United States Holder's ability to
offset capital losses against ordinary income is limited.
 
                                      S-12
<PAGE>   13
 
NON-UNITED STATES HOLDERS
 
     Non-United States Holders will not be subject to United States federal
income taxes, including withholding taxes, on the interest income (including any
OID) on, or gain from the sale or disposition of, any Offered Note provided that
(1) the interest income or gain is not effectively connected with the conduct by
the Non-United States Holder of a trade or business within the United States,
(2) the Non-United States Holder is not a controlled foreign corporation related
to the Company through stock ownership, (3) with respect to any gain, the
Non-United States Holder, if an individual, is not present in the United States
for 183 days or more during the taxable year and (4) the Non-United States
Holder provides the correct certification of his status (which may generally be
satisfied by providing an Internal Revenue Service Form W-8 certifying that the
beneficial owner is not a United States Holder and providing the name and
address of the beneficial owner).
 
     An individual holder of an Offered Note who is not a citizen or resident of
the United States at the time of the holder's death will not be subject to
United States federal estate tax as a result of the holder's death, as long as
any interest received on the Offered Note, if received by the holder at the time
of the holder's death, would not be effectively connected with the conduct of a
trade or business by such individual in the United States.
 
BACKUP WITHHOLDING
 
     In general, if a non-corporate holder fails to furnish a correct taxpayer
identification number or certification of foreign or other exempt status, fails
to report dividend and interest income in full, or fails to certify that such
holder has provided a correct taxpayer identification number and is not subject
to backup withholding, a 31 percent federal backup withholding tax may be
withheld on amounts paid to the holder. An individual's taxpayer identification
number is his or her social security number. The backup withholding tax is not
an additional tax and may be credited against a holder's regular federal income
tax liability or refunded by the Internal Revenue Service where applicable.
 
     THE UNITED STATES FEDERAL INCOME TAX DISCUSSION SET FORTH ABOVE IS INCLUDED
FOR GENERAL INFORMATION ONLY AND MAY NOT BE APPLICABLE DEPENDING UPON A HOLDER'S
PARTICULAR SITUATION. HOLDERS SHOULD CONSULT THEIR OWN TAX ADVISORS WITH RESPECT
TO THE TAX CONSEQUENCES TO THEM OF THE OWNERSHIP AND DISPOSITION OF THE NOTES,
INCLUDING THE TAX CONSEQUENCES UNDER STATE, LOCAL, FOREIGN AND OTHER TAX LAWS
AND THE POSSIBLE EFFECTS OF CHANGES IN UNITED STATES OR OTHER TAX LAWS.
 
                              PLAN OF DISTRIBUTION
 
     The Offered Notes are being offered on a continuous basis by the Company
through the Agents, who have agreed to use reasonable best efforts to solicit
purchases of the Offered Notes. Initial purchasers may propose certain terms of
the Offered Notes, but the Company will have the sole right to accept offers to
purchase Offered Notes and may reject proposed purchases in whole or in part.
Each Agent will also have the right, in its discretion reasonably exercised and
without notice to the Company, to reject any proposed purchase of Offered Notes
in whole or in part. The Company will pay each Agent a commission ranging from
.150% to .750% of the principal amount of Offered Notes sold through such Agent,
depending upon Stated Maturity. Commissions on Offered Notes with a Stated
Maturity greater than 30 years will be negotiated at the time of sale.
 
     The Company may sell Offered Notes directly to investors on its own behalf.
In the case of sales made directly by the Company, no commission or discount
will be paid or allowed. In addition, the Company may accept (but not solicit)
offers from additional agents for the sale of particular Offered Notes; provided
that any such solicitation and sale of Offered Notes shall be on terms
substantially similar (including the same commission schedule) as agreed to by
the Agents. Such additional agents will be named in the applicable Pricing
Supplement.
 
                                      S-13
<PAGE>   14
 
     The Company may also sell Offered Notes to an Agent as principal. Unless
otherwise specified in an applicable Pricing Supplement, any Offered 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 equal to the commission
applicable to an agency trade of identical Stated Maturity. Notes may be resold
by an Agent to investors or other purchasers from time to time in one or more
transactions, including negotiated transactions, at a fixed public offering
price or at varying prices determined by such Agent at the time of sale, or may
be sold to certain dealers as described below. After the initial public offering
of Offered Notes to be resold to investors or other purchasers, the public
offering price (in the case of Offered Notes to be resold at a fixed offering
price), the concession and discount may be changed. In addition, any Agent may
sell Offered Notes to any dealer at a discount and, unless otherwise specified
in an applicable Pricing Supplement, such discount allowed to any dealer will
not be in excess of the discount to be received by the Agent from the Company.
 
     No Offered Note will have an established trading market when issued. The
Offered Notes will not be listed on any securities exchange. The Agents may make
a market in the Offered Notes, but the Agents are not obligated to do so and may
discontinue any market-making at any time without notice. There can be no
assurance of a secondary market for any Offered Notes, or that the Offered Notes
will be sold.
 
     Each Agent, whether acting as agent or principal, may be deemed to be an
"underwriter" within the meaning of the Securities Act of 1933, as amended (the
"Securities Act"). The Company has agreed to indemnify the Agents against
certain liabilities, including liabilities under the Securities Act, or to
contribute to payments that the Agents may be required to make in respect
thereof.
 
     Salomon Brothers Inc, M.R. Beal & Company, Lehman Brothers, Lehman Brothers
Inc., (including its affiliate Lehman Government Securities Inc.), Merrill Lynch
& Co., Merrill Lynch, Pierce, Fenner & Smith Incorporated and certain affiliates
thereof engage in transactions with and perform services for the Company and its
affiliates in the ordinary course of business.
 
                                 LEGAL OPINIONS
 
     Certain legal matters in connection with the legality of the securities
offered hereby will be passed upon for any agents, underwriters or dealers by
Winthrop, Stimson, Putnam & Roberts, New York, N.Y.
 
                                      S-14
<PAGE>   15
 
$200,000,000
 
WASHINGTON GAS LIGHT COMPANY
 
FIRST MORTGAGE BONDS
UNSECURED NOTES
PREFERRED STOCK
(NO PAR VALUE)
 
COMMON STOCK
($1 PAR VALUE)
 
Washington Gas Light Company (the "Company") may offer, from time to time, its
Debt Securities (the "Debt Securities"), consisting of First Mortgage Bonds (the
"New Bonds") in one or more series, and/or Unsecured Notes (the "Unsecured
Notes") in one or more series, its Preferred Stock, no par value, (the "New
Preferred Stock") and its Common Stock, $1 par value, (the "Additional Common
Stock" and, together with the New Bonds, the Unsecured Notes and the New
Preferred Stock, the "Securities") at prices and on terms to be determined at
the time of sale. The Securities offered pursuant to this Prospectus may be
issued in one or more series or issuances and will be limited to an aggregate
public offering amount of $200,000,000.
 
All specific terms of the offering and sale of any Securities (the "Offered
Securities", collectively, or "Offered Bonds", in the case of New Bonds or
"Offered Notes" in the case of Unsecured Notes or "Offered Preferred Stock" in
the case of Preferred Stock or "Offered Common Stock" in the case of Common
Stock), including the specific (a) designation, rights, preferences, privileges,
and restrictions relating to any offered Preferred Stock, including dividend
rate or rates (or method of ascertaining the same), dividend payment dates,
voting rights, liquidation preference, and any conversion, exchange, redemption,
or sinking fund provisions applicable thereto, (b) designation, rights, and
restrictions relating to any Offered Bonds or Offered Notes, including whether
any Offered Notes are senior or subordinated, the currencies or composite
currencies in which any Offered Bonds or Offered Notes are denominated, the
aggregate principal amount, the maturity, rate and time of payment of interest
applicable thereto, and any conversion, exchange, redemption, or sinking fund
provisions, and (c) initial public offering price, listing on any securities
exchange, and the agents, dealers, or underwriters, if any, to be utilized in
connection with the sale of any Offered Securities, will be set forth in an
accompanying Prospectus Supplement ("Prospectus Supplement").
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY IS A
CRIMINAL OFFENSE.
                               ------------------
 
The Securities will be sold in accordance with the plan of distribution
described in "Plan of Distribution" herein.
                               ------------------
 
The date of this Prospectus is January 27, 1995.
<PAGE>   16
 
                             AVAILABLE INFORMATION
 
     The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "1934 Act") and in accordance therewith
files reports and other information with the Securities and Exchange Commission
(the "Commission"). Certain information, as of particular dates, concerning
directors and officers, their remuneration, the principal holders of securities
of the Company and any material interest of such persons in transactions with
the Company is disclosed in proxy statements distributed to shareholders of the
Company and filed with the Commission. Such reports, proxy statements and other
information may be inspected and copied at the public reference facilities
maintained by the Commission at Room 1024, 450 Fifth Street, N.W., Washington,
D.C. 20549 and at the Commission's regional offices at Northwest Atrium Center,
500 West Madison Street, Suite 1400, Chicago, Illinois 60661 and at Seven World
Trade Center, New York, N.Y. 10048. Copies of such material can also be obtained
from the Public Reference Section of the Commission, 450 Fifth Street, N.W.,
Washington, D.C. 20549 at prescribed rates. The Company's common stock (the
"Common Stock") is listed on the New York Stock Exchange and on the Philadelphia
Stock Exchange (under the symbol "WGL"), where reports, proxy material and other
information concerning the Company may also be inspected. The Company's
preferred stock (the "Preferred Stock") is also listed on the Philadelphia Stock
Exchange.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
     There is hereby incorporated by reference in this Prospectus the Company's
Annual Report on Form 10-K for the year ended September 30, 1994 and the
Company's Proxy Statement dated December 31, 1993.
 
     All documents filed by the Company pursuant to Sections 13, 14, or 15(d) of
the 1934 Act after the date of this Prospectus and prior to the termination of
the offering of the Securities shall be deemed to be incorporated by reference
in this Prospectus and to be a part hereof from the date of filing of such
documents (such documents, and the documents enumerated above, being hereinafter
referred to as the "Incorporated Documents"; provided, however, in each year
during which an offering is made by this Prospectus, all documents filed by the
Company pursuant to Sections 13, 14 or 15(d) of the 1934 Act prior to the filing
with the Commission of the Company's Annual Report on Form 10-K covering such
year shall not be Incorporated Documents or be incorporated by reference in this
Prospectus or be a part hereof from and after such filing of such Annual Report
on Form 10-K).
 
     Any statement contained in an Incorporated Document shall be deemed to be
modified or superseded for purposes of this Prospectus to the extent that a
statement contained herein or in any other subsequently filed Incorporated
Document or in an accompanying Prospectus Supplement modifies or supersedes such
statement. Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of this Prospectus.
 
     UPON WRITTEN OR ORAL REQUEST, THE COMPANY WILL PROVIDE WITHOUT CHARGE TO
ANY PERSON TO WHOM A COPY OF THIS PROSPECTUS HAS BEEN DELIVERED A COPY OF ANY OR
ALL OF THE INCORPORATED DOCUMENTS WHICH HAVE BEEN OR MAY BE INCORPORATED IN THIS
PROSPECTUS BY REFERENCE, OTHER THAN EXHIBITS TO SUCH DOCUMENTS (UNLESS SUCH
EXHIBITS ARE SPECIFICALLY INCORPORATED BY REFERENCE INTO SUCH DOCUMENTS).
WRITTEN OR ORAL REQUESTS FOR SUCH COPIES SHOULD BE DIRECTED TO: SHAREHOLDER
SERVICES, WASHINGTON GAS LIGHT COMPANY, 1100 H STREET, N.W., WASHINGTON, D.C.
20080, (TELEPHONE NUMBERS: 202-624-6026 OR 1-800-221-WGAS). THE INFORMATION
RELATING TO THE COMPANY CONTAINED IN THIS DOCUMENT DOES NOT PURPORT TO BE
COMPREHENSIVE AND SHOULD BE READ TOGETHER WITH THE INFORMATION CONTAINED IN THE
INCORPORATED DOCUMENTS.
 
                                        2
<PAGE>   17
 
                                  THE COMPANY
 
     The Company provides natural gas service to metropolitan Washington, D.C.
and adjoining areas through three divisions and two distribution subsidiaries.
The Company has been engaged in the gas distribution business for 146 years,
having been originally incorporated by an Act of Congress in 1848. It became a
domestic corporation of the Commonwealth of Virginia in 1953 and a corporation
of the District of Columbia in 1957.
 
     The Company's three jurisdictional divisions are located in the District of
Columbia, Maryland and Virginia. Portions of West Virginia are served by one of
the Company's distribution subsidiaries. The population of the area served is
estimated to be 4.4 million. As of September 30, 1994, the Company and its
distribution subsidiaries served 725,960 customer meters. A listing of meters
served and therms delivered as of and for the twelve months ended September 30,
1994 by jurisdiction is shown in the following table:
 
<TABLE>
<CAPTION>
                                                                             THERMS DELIVERED
        JURISDICTION                                       METERS SERVED        (MILLIONS)
        ------------                                       -------------     ----------------
    <S>                                                       <C>                  <C>
    District of Columbia.................................     143,895                325
    Maryland.............................................     305,064                660
    Virginia.............................................     274,443                457
    West Virginia........................................       2,558                 23
                                                              -------              -----
              Total......................................     725,960              1,465
                                                              =======              =====
</TABLE>                                                                  
 
     Of the 1,465 million therms delivered in fiscal year 1994, 46% was sold to
firm residential customers, 30% was sold to firm commercial and industrial
customers, 16% was sold to interruptible commercial and industrial customers, 6%
was sold to an interruptible electric generation facility and 2% was transported
for various end-use customers. Therms delivered by the parent company amounted
to 1,373 million therms, or 94% of the total consolidated deliveries. A therm of
gas contains 100,000 British Thermal Units of heat, the heat content of
approximately 100 cubic feet of natural gas.
 
SUBSIDIARIES
 
     The Company has five wholly-owned active subsidiaries which are described
below.
 
     Shenandoah Gas Company ("Shenandoah") is engaged in the distribution and
sale of natural gas at retail in the Shenandoah Valley, including Winchester,
Middletown, Strasburg, Stephens City and New Market, Virginia, and Martinsburg,
West Virginia. Deliveries of natural gas for the twelve months ended September
30, 1994 totalled 55 million therms, of which 12% was sold to firm residential
customers, 36% was sold to firm commercial and industrial customers, 50% was
sold to interruptible commercial and industrial customers, and 2% was
transported for various end-use customers.
 
     Frederick Gas Company, Inc. ("Frederick") distributes and sells natural gas
at retail in Frederick County, Maryland in and near the City of Frederick. It
also provides propane gas service in Frederick County. Deliveries of natural gas
for the twelve months ended September 30, 1994 totalled 37 million therms, of
which 20% was sold to firm residential customers, 29% was sold to firm
commercial and industrial customers, 50% was sold to interruptible commercial
and industrial customers and 1% was transported for various end-use customers.
 
     Hampshire Gas Company ("Hampshire") operates an underground gas storage
field in the vicinity of Augusta, West Virginia on behalf of the Company under a
cost of service tariff regulated by the Federal Energy Regulatory Commission
(FERC).
 
     Crab Run Gas Company ("Crab Run") is an exploration and production
subsidiary whose assets are being managed by an Oklahoma-based limited
partnership. The Company expects that any additional investments in the
partnership will be minimal.
 
                                        3
<PAGE>   18
 
     Washington Resources Group, Inc. ("WRG") holds the Company's diversified
operations, except for Crab Run, to more clearly delineate non-utility
operations from the regulated utility businesses. Operations in this subsidiary
have been scaled-back significantly, as the Company continues to focus on
opportunities within the natural gas distribution business. On October 3, 1994,
the stock of American Environmental Products, Inc., one of WRG's subsidiaries,
was sold. WRG's remaining subsidiaries are described below.
 
     Washington Gas Energy Systems, Inc. supplies and installs residential and
commercial energy conservation products and services. WRG has announced its
intention to discontinue the operations of this subsidiary in fiscal year 1995
and sell the business.
 
     Brandywood Estates, Inc. ("Brandywood") is a general partner, along with a
major developer, in a venture designed to develop 1,600 acres in Prince George's
County, Maryland for sale or lease. This acreage was contributed to the
Brandywood Development Limited Partnership by Brandywood in 1992. Brandywood
continues to have sole ownership of approximately 1,000 additional acres
adjacent to this property that are not being currently developed or otherwise
utilized.
 
     Advanced Marketing Concepts, Inc. provides services primarily in the area
of energy-related home improvements, including the installation of thermal
windows and thermal walls.
 
                                USE OF PROCEEDS
 
     The use of proceeds realized from the sale of particular Offered Securities
will be set forth in an accompanying Prospectus Supplement. It is expected that
the Company will use net proceeds from the sale of the Securities offered hereby
for three primary purposes: (1) the purchase, acquisition and construction of
additional properties and facilities as well as the funding of increased working
capital requirements; (2) the refunding of maturing long-term debt and
satisfaction of sinking fund requirements; and (3) the refunding of
higher-coupon long-term debt as market conditions permit.
 
                       RATIO OF EARNINGS TO FIXED CHARGES
 
     The following table sets forth the historical ratio of earnings to fixed
charges for the period indicated:
 
<TABLE>
<CAPTION>
    TWELVE MONTHS ENDED SEPTEMBER 30
- ----------------------------------------
1994     1993     1992     1991     1990
- ----     ----     ----     ----     ---- 
<S>      <C>      <C>      <C>      <C> 
 4.1      4.1      4.0      3.7      3.8
</TABLE>
 
     For the purpose of computing the historical ratio of earnings to fixed
charges in the above table, "earnings" consist of net income from continuing
operations plus income taxes and fixed charges. "Fixed charges" consist of (i)
interest, (ii) amortization of debt discount, premium and expense and (iii) a
portion of operating lease payments considered to represent an interest factor.
 
                  RATIO OF EARNINGS TO COMBINED FIXED CHARGES
                         AND PREFERRED STOCK DIVIDENDS
 
     The following table sets forth the historical ratio of earnings to fixed
charges and preferred stock dividends for the period indicated:
 
<TABLE>
<CAPTION>
    TWELVE MONTHS ENDED SEPTEMBER 30
- ----------------------------------------
1994     1993     1992     1991     1990
- ----     ----     ----     ----     ----
<S>      <C>      <C>      <C>      <C>
 3.9      3.8      3.7      3.4      3.5
</TABLE>
 
     For the purpose of computing the historical ratio of earnings to combined
fixed charges and preferred stock dividends in the above table, "earnings"
consist of net income from continuing operations plus income taxes and fixed
charges. "Fixed charges" consist of (i) interest,
 
                                        4
<PAGE>   19
 
(ii) amortization of debt discount, premium and expense and (iii) a portion of
operating lease payments considered to represent an interest factor. Preferred
Stock dividends have been increased by an amount representing the pre-tax
earnings required to cover such dividends.
 
                   DESCRIPTION OF THE NEW BONDS AND MORTGAGE
 
GENERAL
 
     The New Bonds will be issued under the Mortgage and Deed of Trust dated
January 1, 1933 (the "First Mortgage") between the Company and The Riggs
National Bank of Washington, D. C., as successor Trustee (the "Trustee"), as
amended and supplemented, and as to be further supplemented by a supplemental
indenture or indentures (the "Supplemental Indenture or Supplemental
Indentures"). The First Mortgage as so amended and supplemented is hereinafter
referred to as the "Mortgage." The term "Bonds" as used herein refers to any
bond issued and defined under the Mortgage. "Additional Bonds" are any Bonds
hereafter issued and defined under the Mortgage. The statements herein
concerning the New Bonds do not purport to be complete and are qualified in
their entirety by express reference to the Mortgage and to the definitions
therein of the terms used herein.
 
     Reference is made to the applicable Prospectus Supplement for the following
terms of the Offered Bonds (among others): (i) the designation and series of the
Offered Bonds; (ii) the percentage or percentages of their principal amount at
which such Offered Bonds will be issued; (iii) the date or dates on which the
Offered Bonds will mature; (iv) the rate or rates at which the Offered Bonds
will bear interest; (v) the times at which such interest will be payable; (vi)
the dates, if any, on which and the price or prices at which the Offered Bonds
will, pursuant to any mandatory sinking fund provisions, or may, pursuant to any
optional sinking fund provisions, be redeemed by the Company, and the other
detailed terms and provisions of such sinking funds; (vii) the dates, if any,
after which and the price or prices at which the Offered Bonds will, pursuant to
any optional redemption provisions, be redeemable at the option of the Company
or the holders thereof and the other detailed terms and provisions of such
optional redemptions; and (viii) any other special terms or provisions not
inconsistent with the terms of the Mortgage.
 
FORM AND EXCHANGEABILITY
 
     The New Bonds will be registered bonds without coupons. They will be
exchangeable without charge for other New Bonds of the same series of different
authorized denominations, in each case for a like aggregate principal amount,
and may be transferred without charge, other than for applicable stamp taxes or
other governmental charges.
 
INTEREST, MATURITY, REDEMPTION, SINKING FUND PAYMENT
 
     See the applicable Prospectus Supplement for a description of these terms,
including (if applicable) a description of provisions relating to the early
maturity of Offered Bonds at the option of the holder thereof.
 
ISSUANCE OF ADDITIONAL BONDS
 
     Additional Bonds ranking equally with the New Bonds may be issued in
principal amount equal to:
 
          (a) 60% of the lesser of the cost or fair value of property additions
     (other than property additions acquired with moneys derived from insurance)
     not theretofore bonded, less the amount of certain outstanding prior lien
     bonds not theretofore deducted for specified purposes of the Mortgage;
     provided consolidated net earnings of the Company (after depreciation but
     before income taxes) for a specified twelve-month period shall have been at
     least twice the
 
                                        5
<PAGE>   20
 
     annual interest charges on all Bonds outstanding and applied for, on all
     outstanding prior lien bonds, and on all other indebtedness not pledged
     under the Mortgage or a prior lien when such indebtedness is secured by a
     lien prior to that of the Mortgage;
 
          (b) the aggregate principal amount of prior lien bonds not theretofore
     bonded, deposited with the Trustee or retired or invalidated, and
     previously deducted in connection with applications for the issue of Bonds
     or for other specified purposes of the Mortgage;
 
          (c) the amount of cash deposited with the Trustee as the basis for
     such issue if the Company meets the earnings test described in subparagraph
     (a) above;
 
          (d) the principal amount of Bonds retired or surrendered to the
     Trustee and cancelled and not theretofore bonded; provided that if (1) the
     Bonds so cancelled have not theretofore been issued and sold by the Company
     and the new Bonds to be issued shall bear a higher interest rate than the
     Bonds so cancelled, or (2) Bonds shall have been issued based upon property
     additions between the date of such cancellation and the date of the
     application, then such new Bonds shall not be issued unless the earnings
     test set out in subparagraph (a) above shall have been met. (Art. III,
     Secs. 3, 4, 5, 6, & 7).
 
     The Company may withdraw cash deposited as a basis for the issue of Bonds
on substantially the same conditions that Bonds are issuable, except that such
cash may be so withdrawn without compliance with the earnings test referred to
in subparagraph (a) above. (Art. VIII, Sec. 1)
 
     The Supplemental Indenture creating the Bonds of the 8-5/8% Series due
March 1, 2017 (Supp. Ind. dated March 1, 1987) provides that so long as any of
the Bonds of this series are outstanding, such Bonds deposited with the Trustee
in lieu of cash or redeemed by operation of the sinking fund associated with
this series may not thereafter be bonded.
 
     All properties (excluding construction work in progress not placed in
service and non-utility property which has not been used in utility business)
owned on December 31, 1962, by the Company shall be deemed to be bonded, except
for the purpose of the test described in the next succeeding paragraph. (Supp.
Inds., Part III, Sec. 2)
 
     The Company may not issue additional Bonds, and may not withdraw cash
deposited as a basis for the issue of Bonds, on the basis of property additions,
if thereafter, the aggregate of all outstanding Bonds and prior lien bonds,
would exceed 60% of the value (determined as set forth in the Supplemental
Indentures) of the fixed property of the Company plus cash on deposit with the
Trustee (with certain exceptions). (Supp. Inds., Part III, Sec. 3)
 
     As of September 30, 1994, $787.0 million principal amount of Additional
Bonds could have been issued on the basis of redeemed Bonds and property
additions.
 
DIVIDEND RESTRICTIONS
 
     The Company will not declare in any fiscal year any dividend on its Common
Stock (other than in Common Stock) or make any other distribution on or acquire
for value any shares of its Common Stock (other than with the proceeds of
additional stock financing) except out of net income (as defined) earned during
such fiscal year, or out of earned surplus (as defined) earned subsequent to
December 31, 1950. (Supp. Inds., Part III, Sec. 1)
 
DEFEASANCE
 
     Provided that no completed default exists and is continuing under the
Mortgage, the Offered Bonds may be defeased in whole or in part at any time at
the option of the Company. In such a case, the holders of the Offered Bonds
being defeased will be entitled to receive in exchange therefor non-callable
certificates (the "Certificates") entitling them to receive payments (the
"Payments") at the times and in the amounts that principal and interest would
have been payable on the Offered Bonds had they not been defeased. The date on
which a defeasance will occur (the "Exchange
 
                                        6
<PAGE>   21
 
Date") will be specified in a notice of such defeasance that will be mailed to
the registered owners of the Offered Bonds to be defeased not less than 30 nor
more than 45 days prior to the Exchange Date. The Offered Bonds to be defeased
in connection with any partial defeasance will be selected by lot.
 
     The Payments will be made from funds derived from the deposit (the
"Deposit"), with a banking or other financial institution (other than the
Trustee) acting in a fiduciary capacity on behalf of the holders of the
Certificates, of cash and/or non-callable obligations issued or guaranteed by
the United States of America maturing on or before the dates when Payments
become due, the principal amount of and interest on which, when due, will be,
in the aggregate, sufficient (when considered in conjunction with any cash
deposited) to make the Payments.
        
        Offered Bonds which are to be defeased as described above will be
deemed cancelled and paid on the Exchange Date and will no longer be considered
to be outstanding under the Mortgage provided the Deposit has been made.
Thereafter holders of Offered Bonds selected for defeasance will have no claim
against the Company or otherwise under the Mortgage for payments of principal
or interest on such Offered Bonds and such holders' only claim and sole
recourse for payments will be under Certificates and against the Deposit and
the funds derived therefrom. As a condition to defeasing the Offered Bonds as
described above, the Company is obligated to obtain a legal opinion to the
effect that the exchange of the Certificates for the Offered Bonds to be
defeased will be tax free to the holders of the Offered Bonds to be defeased
and to establish the mechanics for the registration and transfer of the
Certificates. The Company must complete any regulatory registrations and obtain
any regulatory approvals necessary for the proper issuance of the Certificates.
No registration or approval will be deemed necessary in this context if the
Company obtains a "no-action" position from the regulatory agency or body
having jurisdiction in the premises.
 
MODIFICATION OF MORTGAGE
 
     Modification of the Mortgage may be made with the consent of the Company
and the holders of 60% in principal amount of outstanding Bonds and 60% in
principal amount of outstanding Bonds of any series which may be affected
differently from any other series. However, no modification of the Mortgage may
be made which would (a) affect the terms of payment of any Bond, (b) permit the
creation by the Company of any mortgage lien prior to or on a parity with that
of the Mortgage, or (c) reduce the aforesaid percentage of bonds. (Supp. Inds.
dated 9/1/86, Part IV, Sec. 2 and 3/1/87, Part V, Sec. 2).
 
MAINTENANCE COVENANT
 
     The Company is required to deposit with the Trustee, cash, Bonds and/or
prior lien bonds, not theretofore bonded, equal to the amount by which, in any
year, in the opinion of an independent engineer or, in certain cases,
arbitrators, the Company has failed to expend to maintain its property in good
condition and in a state of good operating efficiency. Cash so deposited may be
withdrawn to reimburse the Company for maintenance expenditures made by the
Company in any subsequent year to the extent that such expenditures have not
been certified to the Trustee to satisfy the maintenance covenant, and under
certain other conditions. (Art. IV, Sec. 6)
 
SECURITY AND PRIORITY
 
     In the opinion of John K. Keane, Jr., Esq., the New Bonds issued under the
Mortgage will be secured, together with all Bonds now or hereafter issued under
the Mortgage, by a valid first lien on substantially all the property now or
hereafter owned by the Company (except as noted below), subject to permissible
encumbrances as defined in the Mortgage, to certain minor encumbrances, and with
respect to property hereafter acquired, to prior liens.
 
     There are excepted from the lien of the Mortgage all securities other than
those covenanted to be pledged, all cash, bills, notes, accounts receivable,
contracts, operating agreements, all equip-
 
                                        7
<PAGE>   22
 
ment and materials not theretofore installed as a part of the fixed property of
the Company, and merchandise and supplies acquired for resale in the ordinary
course of business.
 
EVENTS OF DEFAULT
 
     Maturity of the Bonds may be accelerated upon any event of default, by the
Trustee or by the holders of 25% in amount of outstanding Bonds, but the holders
of a majority in amount of the Bonds may waive any default and rescind any
declaration if such default is cured. (Art. IX, Sec. 1)
 
     Any one of the following is an event of default: default in payment of
principal; default, continued for sixty days, in payment of interest; default in
payment of interest or principal on any underlying bonds or prior lien bonds
(beyond the period of grace specified in the applicable underlying mortgages or
prior liens); failure, continued for sixty days after notice, to perform any
other covenants or conditions of the Mortgage; insolvency of the Company or
certain bankruptcy, insolvency or receivership proceedings. (Art. IX, Sec. 1)
 
     The holders of a majority in principal amount of outstanding Bonds may
direct and control the action of the Trustee in enforcing any remedy or in
exercising any trust or power; and the Trustee is not to be liable with respect
to any action taken or omitted to be taken by it in good faith in accordance
with such direction and control. (Art. IX, Sec. 11, Art. XII, Sec. 2)
 
     If an event of default is continuing, the Trustee is entitled to be
indemnified to its satisfaction in proceeding, at the request or direction,
respectively, of the holders of not less than 25% or a majority in principal
amount of the Bonds, to enforce payment of the Bonds and to foreclose or
otherwise realize on the trust estate. (Art. IX, Secs. 4 & 12)
 
     The Trustee is required to give notice to bondholders of any continuing
default known to it, but except for a default in the payment of principal or
interest on the Bonds, or in any sinking, improvement, maintenance, or analogous
fund payment, the Trustee may withhold such notice, if its responsible officers
in good faith determine that such withholding is in the interest of the
bondholders. (Art. XII, Sec. 3)
 
     Periodically or upon the happening of certain events, the Mortgage requires
the Company to furnish the Trustee with various certificates and other documents
evidencing compliance with certain terms of the Mortgage, including the
earnings, sinking fund, and retirement provisions and maintenance requirements.
This may necessitate, depending on the circumstances, an opinion of counsel or
an officers' certificate, a certificate of an accountant or an engineer (in the
case of accountants and engineers, an independent public accountant or an
independent engineer is sometimes required) or some combination thereof. The
Company is required to file annually with the Trustee a certificate as to
compliance with all terms and conditions of the Mortgage.
 
REGARDING THE TRUSTEE
 
     The Riggs National Bank of Washington, D.C. ("Riggs"), Trustee under the
Mortgage, is also a depositary of the Company and extends lines of credit to the
Company. From time to time the Company has entered into contracts with Riggs for
the sale, on a recourse basis, of certain non-utility accounts receivable.
 
                       DESCRIPTION OF THE UNSECURED NOTES
 
GENERAL
 
     The Unsecured Notes will be issued under an Indenture, dated as of
September 1, 1991 (the "Indenture"), between the Company and The Bank of New
York, as trustee (the "Indenture Trustee"). The following summaries under this
heading do not purport to be complete and are subject to the detailed provisions
of the Indenture, a form of which is filed as an exhibit to the
 
                                        8
<PAGE>   23
 
Registration Statement of which this Prospectus is a part. Wherever particular
provisions of the Indenture or terms defined therein are referred to, such
provisions or definitions are incorporated by reference as a part of the
statements made herein and such statements are qualified in their entirety by
such reference. References to article and section numbers are to articles and
sections in the Indenture or supplemental indentures. Terms used under this
heading or in any Prospectus Supplement relating to the Offered Notes which are
defined under this heading are so defined solely with reference to the Offered
Notes.
 
     The Indenture provides that, in addition to the Unsecured Notes, additional
debt securities (including both interest-bearing and original issue discount
securities) may be issued thereunder, without limitation as to the aggregate
principal amount (See Section 301). The Unsecured Notes and all other debt
securities hereafter issued under the Indenture or supplemental indentures are
collectively referred to as the "Indenture Securities." The indenture does not
limit the amount of other debt, secured or unsecured, which may be issued by the
Company. The Unsecured Notes will rank pari passu with all other unsecured
indebtedness of the Company.
 
     The Company executed a supplemental indenture (the "MTN Supplemental
Indenture") dated as of September 1, 1993, to The Bank of New York, as Indenture
Trustee. The MTN Supplemental Indenture limits the issuance of New Bonds by the
Company (Art. VI, Sec. 608). The Supplemental Indenture provides that the
Company will not issue any New Bonds under its Mortgage, dated January 1, 1933,
in addition to its Bonds outstanding under the Mortgage as of September 1, 1993,
without making effective provision, and the Company covenants that in any such
case effective provision will be made, whereby the Unsecured Notes shall be
secured by the Mortgage equally and ratably with any and all other obligations
and indebtedness thereby secured.
 
     Reference is made to the applicable Prospectus Supplement for a description
of the following terms of the Offered Notes in respect of which this Prospectus
is being delivered: (i) the title of such Offered Notes; (ii) the limit, if any,
upon the aggregate principal amount of such Offered Notes; (iii) the rate or
rates, or the method of determination thereof, at which such Offered Notes will
bear interest, if any; the date or dates from which such interest will accrue;
the dates on which such interest will be payable ("Interest Payment Date"); and
the regular record dates for the interest payable on such Interest Payment
Dates; (iv) the obligation, if any, of the Company to redeem or purchase such
Offered Notes pursuant to any sinking fund or analogous provisions or at the
option of the holder and the periods within which or the dates on which, the
prices at which and the terms and conditions upon which such Offered Notes will
be redeemed or purchased, in whole or in part, pursuant to such obligation; (v)
the periods within which or the dates on which, the prices at which and the
terms and conditions upon which such Offered Notes may be redeemed, if any, in
whole or in part, at the option of the Company; (vi) if other than denominations
of $1,000 and any integral multiple thereof, the denominations in which such
Offered Notes will be issuable; (vii) whether such Offered Notes are to be
issued in whole or in part in the form of one or more global Unsecured Notes
and, if so, the identity of the depositary for such global Unsecured Notes;
(viii) the terms under which the Offered Notes may be convertible into Common
Stock; and (ix) any other terms of such Offered Notes not inconsistent with the
provisions of the Indenture.
 
PAYMENT OF NOTES; TRANSFERS; EXCHANGES
 
     Except as may be provided in the applicable Prospectus Supplement,
interest, if any, on each Unsecured Note payable on each Interest Payment Date
will be paid by check mailed to the person in whose name such Unsecured Note is
registered (the registered holder of any Indenture Security being herein called
a "Holder") as of the close of business on the regular record date relating to
such Interest Payment Date; provided, however, that interest payable at maturity
(whether at stated maturity, upon redemption or otherwise, hereinafter
"Maturity") will be paid to the person to whom principal is paid. However, if
there has been a default in the payment of interest on any Unsecured Note, such
defaulted interest may be payable to the Holder of such Unsecured Note as of the
close
 
                                        9
<PAGE>   24
 
of business on a date selected by the Indenture Trustee not more than 15 days
and not less than 10 days prior to the date proposed by the Company for payment
of such defaulted interest.
 
     Principal of and premium, if any, and interest, if any, on the Unsecured
Notes at maturity will be payable upon presentation of the Unsecured Notes at
the principal corporate trust office of The Bank of New York in New York, New
York. The Company may change the place of payment on the Unsecured Notes, may
appoint one or more paying agents (including the Company) and may remove any
paying agent, all in its discretion. The applicable Prospectus Supplement, or a
supplement thereto, will identify any new place of payment and any paying agent
appointed, and will disclose the removal of any paying agent effected, prior to
the date of such Prospectus Supplement or supplement thereto.
 
     The transfer of Unsecured Notes may be registered, and Unsecured Notes may
be exchanged for other Unsecured Notes of authorized denominations and of like
tenor and aggregate principal amount, at the principal corporate trust office of
The Bank of New York in New York, New York. The Company may change the place for
registration of transfer of the Unsecured Notes, may appoint one or more
additional security registrars or transfer agents (including the Company) and
may remove any security registrar or transfer agent, all in its discretion. The
applicable Prospectus Supplement, or a supplement thereto, will identify any new
place for registration of transfer and any additional security registrar or
transfer agent appointed, and will disclose the removal of any security
registrar or transfer agent effected, prior to the date of such Prospectus
Supplement or supplement thereto. No service charge will be made for any
transfer or exchange of the Unsecured Notes, but the Company may require payment
of a sum sufficient to cover any tax or other governmental charge payable in
connection therewith (See Section 305). The Company will not be required (a) to
issue, register the transfer of or exchange Unsecured Notes during a period of
15 days prior to giving any notice of redemption or (b) to issue, register the
transfer of or exchange any Unsecured Note selected for redemption in whole or
in part, except the unredeemed portion of any Unsecured Note being redeemed in
part.
 
REDEMPTION
 
     Any terms for the optional or mandatory redemption of Offered Notes will be
set forth in the applicable Prospectus Supplement. Except as shall otherwise be
provided with respect to Offered Notes redeemable at the option of the Holder,
such Offered Notes will be redeemable only upon notice, by mail, not less than
30 nor more than 60 days prior to the date fixed for redemption and, if less
than all of the Offered Notes of any series, or any tranche thereof, are to be
redeemed, the particular Offered Notes will be selected by such methods as the
Security Registrar deems fair and appropriate (See Sections 403 and 404).
 
     Any notice of optional redemption may state that such redemption shall be
conditional upon the receipt by the Indenture Trustee, on or prior to the date
fixed for such redemption, of money sufficient to pay the principal of and
premium, if any, and interest, if any, on such Unsecured Notes and that if such
money has not been so received, such notice will be of no force or effect and
the Company will not be required to redeem such Unsecured Notes (See Section
404).
 
CONVERSION RIGHTS
 
     The applicable Prospectus Supplement will provide whether the Offered Notes
will consist of convertible Unsecured Notes and, if so, the initial conversion
price per share at which such convertible Unsecured Notes will be convertible
into Common Stock. Subject to prior redemption of the convertible Unsecured
Notes, the Holders of such Unsecured Notes will be entitled at any time on or
before the close of business on the maturity date thereof to convert such
Unsecured Notes (or, in the case of convertible Unsecured Notes of denominations
in excess of $1,000 any portion of which is $1,000 or an integral multiple of
$1,000) into shares of Common Stock at the initial conversion price set forth in
the applicable Prospectus Supplement. No adjustment will be made on
 
                                       10
<PAGE>   25
 
conversion of any convertible Unsecured Notes for interest accrued thereon or,
except as set forth below, for dividends on any securities issued upon such
conversion.
 
     In order to exercise the right of conversion, the Holder of any such
convertible Unsecured Notes must surrender such convertible Unsecured Notes to
the Company at any office or agency of the Company maintained for such purpose.
The convertible Unsecured Notes to be surrendered must be accompanied by written
notice to the Company that the Holder elects to convert such Securities.
 
     If any convertible Unsecured Note, whether or not called for redemption, is
converted between a record date for the payment of interest and the next
succeeding Interest Payment Date, such convertible Unsecured Note must be
accompanied by funds payable to the Company equal to the interest payable to the
registered Holder on such Interest Payment Date on the principal amount so
converted. In the case of any convertible Unsecured Note or portion thereof
called for redemption, conversion rights expire at the close of business on the
Redemption Date, even if such redemption occurs at a time when conversion of the
Unsecured Note or portion thereof is in the best interests of the Holder.
 
     No fractional shares of Common Stock will be issued upon conversion but, in
lieu thereof, an adjustment in cash will be made based on the market price of
the Common Stock at the close of business on the date of conversion.
 
     The conversion price will be subject to adjustment in the event of: (i) the
payment of certain stock dividends on the Common Stock; (ii) the issuance of
certain rights or warrants to all holders of the Common Stock entitling them to
subscribe for or purchase Common Stock at a price less than the market price;
(iii) the subdivision of Common Stock into a greater number of shares of Common
Stock; (iv) the distribution by the Company to all holders of the Common Stock
of evidences of indebtedness or assets of the Company (excluding rights or
warrants and any dividends or distributions mentioned above); and (v) the
reclassification of Common Stock into other securities.
 
EVENTS OF DEFAULT
 
     The following constitute events of default under the Indenture (an "Event
or Events of Default") with respect to each series of Indenture Securities
outstanding thereunder:
 
          (a) failure to pay any interest on any Indenture Security of such
     series within 60 days after the same becomes due and payable;
 
          (b) failure to pay any principal of or premium on any Indenture
     Security of such series within three business days after the same becomes
     due and payable;
 
          (c) failure to perform or breach of any covenant or warranty of the
     Company in the Indenture (other than a covenant or warranty of the Company
     in the Indenture solely for the benefit of one or more series of Indenture
     Securities other than the Unsecured Notes), for a period of 60 days after
     written notice to the Company by the Indenture Trustee, or to the Company
     and the Indenture Trustee by the Holders of at least 33% in principal
     amount of the Indenture Securities of such series outstanding under the
     Indenture as provided in the Indenture;
 
          (d) certain events of bankruptcy, insolvency or reorganization; and
 
          (e) any other Event of Default specified with respect to Indenture
     Securities of such series (See Section 801).
 
     No Event of Default with respect to the Unsecured Notes necessarily
constitutes an Event of Default with respect to the Indenture Securities of any
other series issued under the Indenture.
 
                                       11
<PAGE>   26
 
REMEDIES
 
     If an Event of Default with respect to any series of Indenture Securities
occurs and is continuing, then either the Indenture Trustee or the Holders of
not less than 33% in principal amount of the outstanding Indenture Securities of
such series may declare the principal amount (or if the Indenture Securities of
such series are discount notes or similar Indenture Securities, such portion of
the principal amount as may be specified in the applicable Prospectus
Supplement) of all of the Indenture Securities of such series to be due and
payable immediately; provided, however, that if an Event of Default occurs and
is continuing with respect to more than one series of Indenture Securities, the
Indenture Trustee or the Holders of not less than 33% in aggregate principal
amount of the outstanding Indenture Securities of all such series, considered as
one class, may make such declaration of acceleration and not the Holders of the
Indenture Securities of any one of such series.
 
     At any time after the declaration of acceleration with respect to the
Indenture Securities of any series has been made and before a judgment or decree
for payment of the money due has been obtained, the Event or Events of Default
giving rise to such declaration of acceleration will, without further act, be
deemed to have been waived, and such declaration and its consequences will,
without further act, be deemed to have been rescinded and annulled, if
 
        (a) the Company has paid or deposited with the Indenture Trustee a sum
     sufficient to pay
 
             (1) all overdue interest on all Indenture Securities of such
        series;
 
             (2) the principal of and premium, if any, on any Indenture
        Securities of such series which have become due otherwise than by such
        declaration of acceleration and interest thereon at the rate or rates
        prescribed therefor in such Indenture Securities;
 
             (3) interest upon overdue interest at the rate or rates prescribed
        therefor in such Indenture Securities, to the extent that payment of
        such interest is lawful; and
 
             (4) all amounts due to the Indenture Trustee under the Indenture;
 
and
 
        (b) any other Event or Events of Default with respect to the Indenture
     Securities of such series, other than the nonpayment of the principal of
     the Indenture Securities of such series which has become due solely by such
     declaration of acceleration, have been cured or waived as provided in the
     Indenture (See Section 802).
 
     If an Event of Default with respect to the Indenture Securities of any
series occurs and is continuing, the Holders of a majority in principal amount
of the outstanding Indenture Securities of such series will have the right to
direct the time, method and place of conducting any proceeding for any remedy
available to the Indenture Trustee, or exercising any trust or power conferred
on the Indenture Trustee, with respect to the Indenture Securities of such
series; provided, however, that if an Event of Default occurs and is continuing
with respect to more than one series of Indenture Securities, the Holders of a
majority in aggregate principal amount of the outstanding Indenture Securities
of all such series, considered as one class, will have the right to make such
direction, and not the Holders of the Indenture Securities of any one of such
series; and provided, further, that (a) such direction will not be in conflict
with any rule of law or with the Indenture and would not involve the Indenture
Trustee in personal liability in circumstances where reasonable indemnity could
not be adequate and (b) the Indenture Trustee may take any other action it deems
proper which is not inconsistent with such direction (See Section 812). The
right of a Holder of any Indenture Security of such series to institute a
proceeding with respect to the Indenture is subject to certain conditions
precedent, but each Holder has an absolute right to receive payment of principal
and premium, if any, and interest, if any, when due and to institute suit for
the enforcement of any such payment (See Sections 807 and 808). The Indenture
provides that the Indenture Trustee, within 90 days after the occurrence of any
default thereunder with respect to the Indenture Securities of a series, is
required to give the Holders of the Indenture Securities of such series
 
                                       12
<PAGE>   27
 
notice of any default known to it, unless cured or waived; provided, however,
that, except in the case of a default in the payment of principal of or premium,
if any, or interest, if any, on any Indenture Securities of such series, the
Indenture Trustee may withhold such notice if the Indenture Trustee determines
that it is in the interest of such Holders to do so; and provided, further, that
in the case of an Event of Default of the character specified above in clause
(c) under "Events of Default," no such notice shall be given to such Holders
until at least 75 days after the occurrence thereof (See Section 902).
 
     The Company will be required to furnish annually to the Indenture Trustee a
statement as to the performance by the Company of certain of its obligations
under the Indenture and as to any default in such performance (See Section 606).
 
COVENANTS; CONSOLIDATION, MERGER, ETC.
 
     The Company will cause (or, with respect to property owned in common with
others, make reasonable effort to cause) all its properties used or useful in
the conduct of its business to be maintained and kept in good condition, repair
and working order and will cause (or with respect to property owned in common
with others make reasonable effort to cause) to be made all necessary repairs,
renewals, replacements, betterments and improvements thereof, all as, in the
judgment of the Company, may be necessary so that the business carried on in
connection therewith may be properly conducted; provided, however, that the
foregoing shall not prevent the Company from discontinuing, or causing the
discontinuance of, the operation and maintenance of any of its properties if
such discontinuance is, in the judgment of the Company, desirable in the conduct
of its business (See Section 605).
 
     Subject to the provisions described in the next paragraph, the Company will
do or cause to be done all things necessary to preserve and keep in full force
and effect its corporate existence and rights (charter and statutory) and
franchises of the Company; provided, however, that the Company not be required
to preserve any such right or franchise if, in the judgment of the Company,
preservation thereof is no longer desirable in the conduct of the business of
the Company and the loss thereof does not adversely affect the interests of the
Holders in any material respect (See Section 604).
 
     The Company will not consolidate with or merge into any other corporation
or corporations or convey, transfer or lease its properties and assets
substantially as an entirety to any person or persons unless (a) the corporation
or corporations formed by such consolidation or into which the Company is merged
or the person or persons which acquires by conveyance or transfer, or which
leases, the property and assets of the Company substantially as an entirety,
expressly assumes, by supplemental indenture, the due and punctual payment of
the principal of and premium, if any, and interest, if any, on all the Indenture
Securities and the performance of all of the covenants of the Company under the
Indenture, (b) immediately after giving effect to such transactions no Event of
Default, and no event which after notice and lapse of time would become an Event
of Default, will have occurred and be continuing, and (c) the Company will have
delivered to the Indenture Trustee an Opinion of Counsel as provided in the
Indenture (See Section 1101).
 
MODIFICATION OF INDENTURE
 
     Without the consent of any Holders of Indenture Securities, the Company and
the Indenture Trustee may enter into one or more supplemental indentures for any
of the following purposes:
 
          (a) to evidence the succession of another person to the Company and
     the assumption by any such successor of the covenants of the Company in the
     Indenture and the Indenture Securities; or
 
                                       13
<PAGE>   28
 
          (b) to add to the covenants of the Company for the benefit of the
     Holders of all or any series of outstanding Indenture Securities or to
     surrender any right or power conferred upon the Company by the Indenture;
     or
 
          (c) to add any additional Events of Default with respect to all or any
     series of outstanding Indenture Securities; or
 
          (d) to change or eliminate any provision of the Indenture or to add
     any new provision to the Indenture; provided that if such change,
     elimination or addition will adversely affect the interests of the Holders
     of Indenture Securities of any series in any material respect, such change,
     elimination or addition will become effective with respect to such series
     only when there is no Indenture Security of such series remaining
     outstanding under the Indenture; or
 
          (e) to provide collateral security for the Indenture Securities; or
 
          (f) to establish the form or terms of Indenture Securities of any
     series as permitted by the Indenture; or
 
          (g) to evidence and provide for the acceptance of appointment of a
     successor indenture trustee under the Indenture with respect to the
     Indenture Securities of one or more series and to add to or change any of
     the provisions of the Indenture as shall be necessary to provide for or to
     facilitate the administration of the trusts under the Indenture by more
     than one trustee; or
 
          (h) to provide for the procedures required to permit the utilization
     of a noncertificated system of registration for any series of Indenture
     Securities; or
 
          (i) to change any place where (1) the principal of and premium, if
     any, and interest, if any, on Indenture Securities of any series, or any
     tranche thereof, shall be payable, (2) any Indenture Securities of any
     series, or any tranche thereof, may be surrendered for registration of
     transfer, (3) Indenture Securities of any series, or any tranche thereof,
     may be surrendered for exchange and (4) notices and demands to or upon the
     Company in respect of the Indenture Securities of any series, or any
     tranche thereof, and the Indenture may be served; or
 
          (j) to cure any ambiguity or inconsistency or to make any other
     provisions with respect to matters and questions arising under the
     Indenture, provided such provisions shall not adversely affect the
     interests of the Holders of Indenture Securities of any series in any
     material respect (See Section 1201).
 
     Without limiting the generality of the foregoing, if the Trust Indenture
Act of 1939, as amended (the "Trust Indenture Act"), is amended after the date
of the Indenture to require changes to the Indenture or the incorporation
therein of additional provisions or permit changes to, or the elimination of,
provisions which, at the date of the Indenture or at any time thereafter, are
required by the Trust Indenture Act to be contained in the Indenture, the
Company and the Trustee may, without the consent of any Holders, enter into one
or more supplemental indentures to effect or reflect any such change,
incorporation or elimination.
 
     The consent of the Holders of not less than a majority in principal amount
of the Indenture Securities of all series then outstanding under the Indenture,
considered as one class, is required for the purpose of adding any provisions
to, or changing in any manner or eliminating any of the provisions of, the
Indenture pursuant to an indenture or supplemental indenture; provided, however,
that if less than all of the series of Indenture Securities outstanding under
the Indenture are directly affected by a supplemental indenture, then the
consent only of the Holders of a majority in aggregate principal amount of the
outstanding Indenture Securities of all series so directly affected, considered
as one class, will be required; and provided, further, that if the Indenture
Securities of any series shall have been issued in more than one tranche and if
the proposed supplemental indenture shall directly affect the rights of the
Holders of Indenture Securities of one or more, but less than all, of such
tranches, then the consent only of the Holders of a majority in aggregate
principal amount of the Outstanding Indenture Securities of all tranches so
directly affected,
 
                                       14
<PAGE>   29
 
considered as one class, shall be required; and provided, further, that no such
supplemental indenture will, without the consent of the Holder of each Indenture
Security outstanding under the Indenture of each such series directly affected
thereby, (a) change the stated maturity of, or any installment of principal of
or the rate of interest on (or the amount of any installment of interest on),
any Indenture Security, or reduce the principal thereof or redemption premium
thereon, if any, or change the amount payable upon acceleration of a discount
note or method of calculating the rate of interest thereon, or otherwise modify
certain terms of payment of the principal thereof or interest or premium
thereon, (b) reduce the percentage in principal amount of the Indenture
Securities outstanding under such series required to consent to any supplemental
indenture or waiver under the Indenture or to reduce the requirements for quorum
and voting, or (c) modify certain of the provisions in the Indenture relating to
supplemental indentures, waivers of certain covenants and waivers of past
defaults.
 
     A supplemental indenture which changes or eliminates any covenant or other
provision of the Indenture which has expressly been included solely for the
benefit of one or more particular series of Indenture Securities, or which
modifies the rights of the Holders of Indenture Securities of such series with
respect to such covenant or other provision, shall be deemed not to affect the
rights under the Indenture of the Holders of any other Indenture Securities (See
Section 1202).
 
DEFEASANCE
 
     The Indenture Securities of any series, or any portion of the principal
amount thereof, will be deemed to have been paid for purposes of the Indenture
(except as to any surviving rights of registration of transfer or exchange
expressly provided for in the Indenture), and the entire indebtedness of the
Company in respect thereof will be deemed to have been satisfied and discharged,
if there shall have been irrevocably deposited with the Indenture Trustee, in
trust: (a) money in the amount which will be sufficient, or (b) Government
Obligations (as defined below), which do not contain provisions permitting the
redemption or other prepayment thereof at the option of the issuer thereof, the
principal of and the interest on which when due, without any regard to
reinvestment thereof, will provide monies which, together with the money, if
any, deposited with or held by the Indenture Trustee, will be sufficient, or (c)
a combination of (a) and (b) which will be sufficient, to pay when due the
principal of and premium, if any, and interest, if any, due and to become due on
such Indenture Securities or portions thereof on and prior to the maturity
thereof (See Section 701). For this purpose, Government Obligations include
direct obligations of, or obligations unconditionally guaranteed by, the United
States of America entitled to the benefit of the full faith and credit thereof
and certificates, depositary receipts or other instruments which evidence a
direct ownership interest in such obligations or in any specific interest or
principal payments due in respect thereof.
 
     As a condition to defeasing the Offered Notes as described above, the
Company is obligated to obtain a legal opinion to the effect that the defeasance
of the Offered Notes will be tax free to the Holders of the Offered Notes to be
defeased.
 
REGARDING THE INDENTURE TRUSTEE
 
     The Bank of New York, Indenture Trustee, extends credit to the Company,
along with other banks, under revolving credit agreements. From time to time the
Company has entered into contracts with The Bank of New York for the sale, on a
recourse basis, of certain non-utility accounts receivable. The Bank of New York
also serves as transfer agent and registrar for the Company's Common Stock and
Preferred Stock.
 
                                       15
<PAGE>   30
 
                     DESCRIPTION OF THE NEW PREFERRED STOCK
 
GENERAL
 
     The following is a summary of, and is qualified by reference to, the
provisions of the Company's Charter, as amended (the "Charter"), relating to its
Preferred Stock, no par value, and the New Preferred Stock. The description of
Preferred Stock set forth below and the description of the terms of a particular
series of Preferred Stock set forth in a Prospectus Supplement do not purport to
be complete and are qualified in their entirety by reference to the Company's
Charter and the certificate of designation relating to that series.
 
     The Company's outstanding Preferred Stock is listed on the Philadelphia
Stock Exchange. The applicable Prospectus Supplement will specify whether
application will be made to have the Offered Preferred Stock offered thereby
listed on such exchange. Under the Charter, the Company is authorized to issue a
total of 1,500,000 shares of preferred stock. On September 30, 1994, the Company
had 283,851 shares of Preferred Stock outstanding, in five series as set forth
below:
 
                             SERIAL PREFERRED STOCK
 
<TABLE>
<CAPTION>
                                                                        SHARES
                                                                        ------  
               <S>                                                     <C>    
               $4.25 Series..........................................    70,600
               $5.00 Series..........................................    60,000
               $4.60 Convertible Series..............................       702
               $4.80 Series..........................................   150,000
               $4.36 Convertible Series..............................     2,549
                                                                        -------
                 Total Serial Preferred Stock........................   283,851
                                                                        =======
</TABLE>                                                               
 
     These amounts do not reflect the issuance of the New Preferred Stock
offered hereby. The presently outstanding shares of Preferred Stock are, and the
New Preferred Stock will be, validly issued, fully paid and nonassessable.
 
     The Board of Directors may provide for the issue of Preferred Stock in
series, and with respect to each series (except the $4.25 Series) fix the
dividend rate, terms, and conditions of redemption, liquidation preference, and
sinking fund and conversion provisions (if any). All series will rank on a
parity, and will be preferred over the Common Stock with respect to dividends
and assets.
 
     See "Common Stock Dividends and Price Range -- Dividend Reinvestment and
Common Stock Purchase Plan" for a description of such Plan (as defined below)
which is open to holders of the Company's Preferred Stock.
 
DIVIDENDS
 
     The holders of Preferred Stock $4.25 Series; $5.00 Series; $4.60
Convertible Series; $4.80 Series; and $4.36 Convertible Series are entitled to
receive cumulative cash dividends at the annual rate fixed for each series, as
declared by the Board of Directors, payable quarterly on the first day of the
month following the end of each dividend period, to stockholders of record on
the respective dates fixed by the Board of Directors for the purpose (the
quarterly periods commencing on the first day of February, May, August and
November in each year being the "dividend periods").
 
     The holders of Preferred Stock of series other than the $4.25 Series; $5.00
Series; $4.60 Convertible Series; $4.80 Series and $4.36 Convertible Series,
shall be entitled to receive cumulative cash dividends at the rate fixed for
each series, as declared by the Board of Directors, payable at such times and to
stockholders on such record dates as may be established by the Board of
Directors, and the initial dividend for any new series may be made payable on
such date and cumulative from such date as may be fixed by resolutions adopted
by the Board of Directors.
 
                                       16
<PAGE>   31
 
LIQUIDATION RIGHTS
 
     Holders of Preferred Stock of each series are entitled to receive out of
assets available for distribution to stockholders in the event of any
liquidation, dissolution or winding up of the Company, full payment of the
applicable liquidation preference fixed for such series, plus accrued and unpaid
dividends, before any distribution or payment may be made to holders of Common
Stock.
 
THE NEW PREFERRED STOCK
 
     The rights, preference, privileges, and restrictions of the Preferred Stock
of each series shall be as stated in the Company's Charter and, to the extent
not stated therein, may be fixed by the certificate of designation relating to
such series. A Prospectus Supplement, relating to each series, shall specify the
terms of the Preferred Stock as follows:
 
          (a) The class and series designation;
 
          (b) the maximum number of shares to constitute such series;
 
          (c) the dividend payment date or dates from which dividends shall
     commence to accrue or accumulate, and the dividend rate or rates or method
     of determination or calculation thereof;
 
          (d) the price at and the terms and conditions on which the shares of
     the series may be redeemed, including the time during which shares of the
     series may be redeemed, the premium, if any, over and above the par value
     thereof, and any accumulated dividends thereon that the holders of shares
     of the series shall be entitled to receive upon the redemption thereof,
     which premium may vary at different dates and may also be different with
     respect to shares redeemed through the operation of any retirement or
     sinking fund;
 
          (e) the liquidation preference, if any, over and above the par value
     thereof, and any accumulated dividends thereon, that the holders of shares
     of the series shall be entitled to receive upon the voluntary or
     involuntary liquidation, dissolution, or winding up of the affairs of the
     Company;
 
          (f) whether or not the shares of the series shall be subject to
     operation of a retirement or sinking fund, and, if so, the extent and
     manner in which any such retirement or sinking fund shall be applied to the
     purchase or redemption of the shares of the series for retirement or for
     other corporate purposes, and the terms and provisions relative to the
     operations of such retirement of sinking fund;
 
          (g) the terms and conditions, if any, on which the shares of the
     series shall be convertible into, or exchangeable for, shares of any other
     class or classes of capital stock of the Company or any series of any other
     class or classes, or of any other series of the same class, including the
     price or prices or the rate or rates of conversion or exchange and the
     method, if any, of adjusting the same, provided that shares of such series
     may not be convertible into shares of a series or class that has prior or
     superior rights and preferences as the dividends or distribution of assets
     of the Company upon voluntary or involuntary dissolution or winding up of
     the affairs of the Company;
 
          (h) the voting rights, if any, on the shares of the series, and
 
          (i) any or all other preferences and relative, participating,
     optional, or other special rights, or qualifications, limitations, or
     restrictions thereof.
 
TRANSFER AGENT AND REGISTRAR
 
     The transfer agent and registrar for the Company's Preferred Stock is The
Bank of New York. The Bank of New York, also Indenture Trustee, extends credit
to the Company, along with other banks, under revolving credit agreements. From
time to time the Company has entered into contracts with The Bank of New York
for the sale, on a recourse basis, of certain non-utility
 
                                       17
<PAGE>   32
 
accounts receivable. The Bank of New York also serves as transfer agent and
registrar for the Company's Common Stock.
 
                     COMMON STOCK DIVIDENDS AND PRICE RANGE
 
     The year 1994 was the 143rd consecutive year for which the Company has paid
dividends on its Common Stock, one of the longest dividend records of companies
listed on the New York Stock Exchange. In addition, the Company has increased
dividends for the past 18 years. Dividends are declared on a quarterly basis,
and a formal review of dividend policy is undertaken annually. Future dividends
are subject to factors that ordinarily affect dividend policy, such as future
earnings and the financial condition of the Company.
 
     The Company's Common Stock is listed on the New York Stock Exchange and the
Philadelphia Stock Exchange. Quarterly high and low prices and dividends paid
for the Common Stock for fiscal years 1993 and 1994 are as follows (source: The
Wall Street Journal):
 
                  COMMON STOCK PRICE RANGE AND DIVIDENDS PAID
 
<TABLE>
<CAPTION>
                                                                  DIVIDENDS PAID       DIVIDEND
                                             HIGH       LOW         PER SHARE        PAYMENT DATE
                                             ----       ---       --------------     ------------
    <S>                                      <C>        <C>       <C>                <C>
    Fiscal Year 1994
      Fourth Quarter.......................  $39 1/4    $33 3/4       $.555              8/1/94
      Third Quarter........................   40 3/4     36 3/4        .555              5/1/94
      Second Quarter.......................   42 1/2     39            .545              2/1/94
      First Quarter........................   45 1/2     36 1/4        .545             11/1/93
    Fiscal Year 1993                                                    
      Fourth Quarter.......................  $45 3/4    $42 1/2       $.545              8/1/93
      Third Quarter........................   42 1/2     40            .545              5/1/93
      Second Quarter.......................   44 1/2     37            .535              2/1/93
      First Quarter........................   39         35 3/4        .535             11/1/92
</TABLE>                                                                
 
DIVIDEND REINVESTMENT AND COMMON STOCK PURCHASE PLAN
 
     The Company has a Dividend Reinvestment and Common Stock Purchase Plan (the
"Plan") under which holders of the Company's Common Stock and Preferred Stock
may elect to receive dividends in the form of additional shares of the Company's
Common Stock in lieu of cash. Shareholders and employees may also invest
optional cash payments, no greater than $20,000 per quarter, in such shares.
 
     The transfer agent and registrar for the Plan is The Bank of New York. The
Bank of New York, also Indenture Trustee, extends credit to the Company, along
with other banks, under revolving credit agreements. From time to time the
Company has entered into contracts with The Bank of New York for the sale, on a
recourse basis, of certain non-utility accounts receivable. The Bank of New York
also serves as transfer agent for the Company's Common Stock and Preferred
Stock.
 
     Additional information on the Plan is contained in the Plan prospectus
which may be obtained from Shareholder Services, Washington Gas Light Company,
1100 H Street, N.W., Washington, D.C. 20080, 1-(202)-624-6026 or
1-(800)-221-WGAS.
 
                   DESCRIPTION OF THE ADDITIONAL COMMON STOCK
 
     The following is a summary of, and is qualified by reference to, the
provisions of the Company's Charter, as amended, relating to its Common Stock,
$1 par value and the Additional Common Stock.
 
                                       18
<PAGE>   33
 
     In addition to the amount outstanding as of September 30, 1994, the Company
is authorized by its regulatory commissions to: (a) issue up to 2,250,000 shares
of its Common Stock through one or more public offerings, (b) issue up to
1,383,331 shares of Common Stock under the Plan (see above) and other employee
benefit plans, and (c) issue up to 1,500,000 additional shares of Common Stock
to support the potential issuance of debt securities or Preferred Stock shares
which are convertible into shares of Common Stock. On September 30, 1994, the
Company had 21,093,311 shares of Common Stock outstanding, which does not
reflect the issuance of any shares of Additional Common Stock, or issuance of
any shares pursuant to any conversion feature applicable to any Debt Securities
or New Preferred Stock offered hereby. The presently outstanding shares of
Common Stock of the Company and the Additional Common Stock will be, validly
issued, fully paid and nonassessable.
 
     On September 28, 1994, the Board of Directors of the Company approved a
two-for-one split of the Company's Common Stock. The stock split is expected to
take place in the Spring of 1995 pending approval of the Public Service
Commission of the District of Columbia; on December 8, 1994, the State
Corporation Commission of Virginia approved the stock split and granted
authority to double the number of common shares authorized. An application has
also been filed with the Public Service Commission of the District of Columbia
requesting authority to double the number of common shares authorized by that
commission. In addition, at the February 1995 annual meeting of stockholders,
approval will be sought to increase authorized common shares needed for the
split. The proposed split is expected to cover any shares of Additional Common
Stock issued prior to the date thereof.
 
DIVIDEND RIGHTS
 
     Subject to the preferential rights of the holders of the Preferred Stock to
receive full cumulative dividends, both past and current, and the restrictions
set forth below, the holders of the Common Stock are entitled to receive such
dividends as may be declared by the Board of Directors out of funds legally
available therefor.
 
VOTING, LIQUIDATION AND OTHER RIGHTS
 
     Common stockholders of record are, together with holders of record of
shares of voting Preferred Stock, entitled to one vote for each share on matters
voted upon by stockholders except that whenever dividends on Preferred Stock are
in arrears in an aggregate amount equal to four full quarterly dividends on all
outstanding shares of such stock, the holders of the Preferred Stock (whether
voting or non-voting) have the right, as a class, until all dividends then in
default have been paid, to elect the largest number of directors that does not
exceed 25% of the Board of Directors, but in no event less than two directors;
and the holders of Common Stock will be entitled to elect the remaining
directors.
 
     Upon liquidation, the holders of Common Stock shall be entitled to share
ratably in the distribution of the remaining assets available for distribution
after satisfaction of the preferential liquidation requirements of, and
accumulated unpaid dividends on, the Preferred Stock. The Common Stock and all
series of Preferred Stock have no preemptive rights. Upon issuance, pursuant to
any conversion rights applicable to any Debt Securities or New Preferred Stock,
the shares of Additional Common Stock so issued will be fully paid and
nonassessable.
 
TRANSFER AGENT AND REGISTRAR
 
     The transfer agent and registrar for the Company's Common Stock is The Bank
of New York. The Bank of New York, also Indenture Trustee, extends credit to the
Company, along with other banks, under revolving credit agreements. From time to
time the Company has entered into contracts with The Bank of New York for the
sale, on a recourse basis, of certain non-utility accounts receivable. The Bank
of New York also serves as transfer agent and registrar for the Company's
Preferred Stock.
 
                                       19
<PAGE>   34
 
                              PLAN OF DISTRIBUTION
 
     The Company may sell any series of the Offered Securities in any of three
ways: (i) through underwriters or dealers; (ii) directly to one or more
purchasers; or (iii) through agents designated by the Company. The applicable
Prospectus Supplement will set forth the terms of the offering of any
Securities, including the names of any underwriters or agents, the purchase
price of such Securities and the proceeds to the Company from such sale, any
underwriting discounts and other items constituting underwriters' compensation,
any initial public offering price, any discounts or concessions allowed or
reallowed or paid to dealers and any securities exchanges on which such Offered
Securities may be listed.
 
     If underwriters are used in the sale, Offered Securities will be acquired
by the underwriters for their own account and may be resold from time to time in
one or more transactions, including negotiated transactions, at a fixed public
offering price or at varying prices determined at the time of sale. Such 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
underwriters without a syndicate. Unless otherwise set forth in the applicable
Prospectus Supplement, the obligations of the underwriters to purchase such
Offered Securities will be subject to certain conditions precedent, and the
underwriters will be obligated to purchase all of such Offered Securities if any
of such Offered Securities are purchased. Any initial public offering price and
any discounts or concessions allowed or reallowed or paid to dealers may be
changed from time to time.
 
     Offered Securities may also be sold directly by the Company or through
agents designated by the Company from time to time. Any agent involved in the
offer or sale of Offered Securities will be named, and any commissions payable
by the Company to such agent will be set forth in the applicable Prospectus
Supplement. Unless otherwise indicated in the applicable Prospectus Supplement,
any such agent will act on a best efforts basis for the period of its
appointment.
 
     Any underwriters, dealers or agents participating in the distribution of
Offered Securities may be deemed to be underwriters and any discounts or
commissions received by them on the sale or resale of Securities may be deemed
to be underwriting discounts and commissions under the Securities Act of 1933,
as amended (the "Securities Act"). Agents and underwriters may be entitled under
agreements entered into with the Company to indemnification by the Company
against certain liabilities, including certain liabilities under the Securities
Act or to contribution with respect to payments that the agents or underwriters
may be required to make in respect thereof. Agents and underwriters may be
customers of, engage in transactions with, or perform services for, the Company
or its affiliates in the ordinary course of business.
 
                                 LEGAL OPINIONS
 
     Certain legal matters in connection with the legality of the securities
offered hereby will be passed upon for the Company by John K. Keane, Jr., Esq.
Mr. Keane, Senior Vice President and General Counsel for the Company, is
regularly employed by the Company.
 
                                    EXPERTS
 
     The financial statements and schedules included (incorporated by reference)
in the Company's most recent Annual Report on Form 10-K, which are incorporated
herein by reference, have been audited by Arthur Andersen LLP, independent
public accountants, as indicated in their reports with respect thereto, and are
so incorporated herein in reliance upon the authority of said firm as experts in
giving said reports. Reference is made to said reports, which include an
explanatory paragraph with respect to the change in the methods of accounting
for income taxes and post-retirement benefits other than pensions in 1994, as
discussed in Notes 5 and 8 to the consolidated financial statements.
 
                                       20
<PAGE>   35
 
NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS SUPPLEMENT (INCLUDING ANY PRICING SUPPLEMENT HERETO) AND THE
PROSPECTUS IN CONNECTION WITH THE OFFER CONTAINED HEREIN AND, IF GIVEN OR MADE,
SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE COMPANY OR ANY AGENT. NEITHER THE DELIVERY OF THIS PROSPECTUS
SUPPLEMENT (INCLUDING ANY PRICING SUPPLEMENT HERETO) AND THE PROSPECTUS NOR ANY
SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION THAT
THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE COMPANY SINCE THE DATES AS OF
WHICH INFORMATION IS GIVEN IN THIS PROSPECTUS SUPPLEMENT (INCLUDING ANY PRICING
SUPPLEMENT HERETO) AND THE PROSPECTUS. THIS PROSPECTUS SUPPLEMENT (INCLUDING ANY
PRICING SUPPLEMENT HERETO) AND THE PROSPECTUS DO NOT CONSTITUTE AN OFFER OR
SOLICITATION BY ANYONE IN ANY JURISDICTION IN WHICH SUCH OFFER OR SOLICITATION
IS NOT AUTHORIZED OR IN WHICH THE PERSON MAKING SUCH OFFER OR SOLICITATION IS
NOT QUALIFIED TO DO SO OR TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH
OFFER OR SOLICITATION.
 
                             ---------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                        PAGE
                                        ----
<S>                                     <C>
         PROSPECTUS SUPPLEMENT
Use of Proceeds.......................   S-2
Supplemental Description of the
  Unsecured Notes.....................   S-2
Certain United States Federal Income
  Tax Consequences....................  S-10
Plan of Distribution..................  S-13
Legal Opinions........................  S-14
 
              PROSPECTUS
Available Information.................     2
Incorporation of Certain Documents by
  Reference...........................     2
The Company...........................     3
Use of Proceeds.......................     4
Ratio of Earnings to Fixed Charges....     4
Ratio of Earnings to Combined Fixed
  Charges and Preferred Stock
  Dividends...........................     4
Description of the New Bonds and
  Mortgage............................     5
Description of the Unsecured Notes....     8
Description of New Preferred Stock....    16
Common Stock Dividends and Price
  Range...............................    18
Description of the Additional Common
  Stock...............................    18
Plan of Distribution..................    20
Legal Opinions........................    20
Experts...............................    20
</TABLE>
 
$150,000,000
WASHINGTON GAS
MEDIUM-TERM NOTES, SERIES C
DUE ONE YEAR OR MORE
FROM DATE OF ISSUE
 
SALOMON BROTHERS INC
 
M*R*BEAL & COMPANY
 
LEHMAN BROTHERS
MERRILL LYNCH & CO.
 
PROSPECTUS SUPPLEMENT
DATED FEBRUARY 14, 1995


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