LACLEDE GAS CO
424B5, 2000-09-22
NATURAL GAS DISTRIBUTION
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<PAGE>

                                                     RULE NO. 424(b)(5)
                                                     REGISTRATION NO. 333-40362

PROSPECTUS SUPPLEMENT
(To Prospectus Dated July 24, 2000)
                                  $30,000,000

                              LACLEDE GAS COMPANY
[LOGO]

                              First Mortgage Bonds
                      7.90% Series due September 15, 2030

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

   We will pay interest on the bonds at the rate of 7.90% per year on March 15
and September 15 of each year, beginning on March 15, 2001. We will sell the
bonds only in denominations of $1,000 and integral multiples of that amount. We
may redeem the bonds prior to maturity (1) in whole if substantially all of our
property subject to our mortgage and deed of trust is taken by eminent domain
or sold to a governmental body or its designee or (2) in whole or in part
through the maintenance and improvement fund under our mortgage. In either
case, the redemption price would be equal to 100% of the principal amount of
the bonds being redeemed, plus accrued interest to the redemption date. We may
also redeem the bonds in whole or in part, at our option, at any time before
maturity at a redemption price equal to the greater of (A) 100% of the
principal amount of the bonds being redeemed and (B) the sum of the present
values of the remaining scheduled payments of principal of and interest on the
bonds being redeemed, discounted to the redemption date on a semiannual basis
at the "adjusted treasury rate" plus .25%, as set forth in this prospectus
supplement, plus in each case accrued interest to the redemption date without
premium. The bonds are a series of our first mortgage bonds issued under our
mortgage, which has the benefit of a first mortgage lien on substantially all
of our property. See "Description of First Mortgage Bonds" in the accompanying
prospectus.

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

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

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

<TABLE>
<CAPTION>
                                                              Per
                                                             Bond      Total
                                                             ----      -----
<S>                                                         <C>     <C>
Public Offering Price (1) ................................. 99.882% $29,964,600
Underwriting Commission (2)................................   .875% $   262,500
Proceeds to Company (1)(3)................................. 99.007% $29,702,100
</TABLE>
--------
(1)  The initial public offering price does not include accrued interest.
     Interest on the bonds will accrue from September 15, 2000, and must be
     paid by the purchaser.
(2)  We have agreed to indemnify the underwriters against certain liabilities,
     including liabilities under the Securities Act of 1933.
(3)  Before deducting expenses payable by us estimated at $100,000.

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

   The underwriter is offering the bonds subject to the prior receipt and
acceptance of the bonds by the underwriter and its right to reject any order in
whole or in part. Delivery of the bonds will be made in book-entry form only
through the facilities of The Depository Trust Company on or about September
26, 2000.

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

                           A.G. Edwards & Sons, Inc.

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

         The date of this prospectus supplement is September 21, 2000.
<PAGE>

                                  THE COMPANY

   We are a public utility that distributes and transports natural gas. We
serve approximately 629,000 customers as of June 30, 2000 in the City of St.
Louis, St. Louis County and parts of eight other counties in eastern Missouri
and are subject to the jurisdiction of the Missouri Public Service Commission.
Generally, we sell gas for heating households, certain other household uses and
commercial and industrial space heating. In addition, we operate underground
natural gas storage fields and transport and store liquid propane. We have also
invested in other minor non-utility businesses.

                            DESCRIPTION OF THE BONDS

Bonds Offered................  $30 million principal amount of first mortgage
                               bonds.

Maturity.....................  September 15, 2030.

Interest Rate................  The bonds will bear interest at the rate of
                               7.90% per year.

Interest Payment Dates.......  March 15 and September 15 (commencing March 15,
                               2001).

Security.....................  The bonds are a series of our first mortgage
                               bonds issued under our mortgage, which has the
                               benefit of a first mortgage lien on
                               substantially all of our property.

Record Dates.................  March 1 and September 1.

Trustee......................  State Street Bank and Trust Company of
                               Missouri, N.A.

Use of Proceeds..............  We will use the net proceeds from the sale of
                               the bonds to reimburse our treasury for capital
                               expenditures previously financed through our
                               short-term debt. For the nine months ended June
                               30, 2000, our outstanding short-term debt
                               averaged $110 million at an average annual
                               interest rate of 6.05%. During the past year,
                               we used the proceeds of short-term debt to:

                               .pay gas supply costs; and

                               .  pay capital expenditures for assets acquired
                                  in the ordinary course of business,
                                  including construction and office equipment.

Form and Denomination........  We will sell the bonds in denominations of
                               $1,000 and integral multiples of that amount,
                               and the bonds will be initially represented by
                               a global note registered in the name of a
                               nominee of The Depository Trust Company.

Redemption...................  We may redeem the bonds:

                               .  in whole if substantially all of our
                                  property subject to our mortgage is taken by
                                  eminent domain or sold to a governmental
                                  body or its designee; or

                               .  in whole or in part through the maintenance
                                  and improvement fund under our mortgage to
                                  the extent any cash is paid to the trustee
                                  pursuant to the requirements of that fund.

                                      S-2
<PAGE>

                               In either case, the redemption price would be
                               equal to 100% of the principal amount of the
                               bonds, plus accrued interest to the redemption
                               date. See "Description of First Mortgage
                               Bonds--Eminent Domain Provision" and
                               "Description of First Mortgage Bonds--
                               Maintenance and Improvement Fund" in the
                               accompanying prospectus.

                               We may also redeem the bonds in whole or in
                               part, at our option, at any time before the
                               maturity of the bonds at a redemption price
                               equal to the greater of:

                               .  100% of the principal amount of the bonds
                                  being redeemed; and

                               .  as determined by the independent investment
                                  banker, the sum of the present values of the
                                  remaining scheduled payments of principal of
                                  and interest on the bonds being redeemed
                                  (excluding the portion of any such interest
                                  accrued to the redemption date), discounted
                                  (for purposes of determining such present
                                  values) to the redemption date on a
                                  semiannual basis (assuming a 360-day year
                                  consisting of twelve 30-day months) at the
                                  adjusted treasury rate plus .25%;

                               plus, in each case, accrued interest thereon to
                               the redemption date without premium.

                               In each instance of redemption, we will give
                               registered holders (which, as long as the bonds
                               are in the book-entry only system, will be The
                               Depository Trust Company or its nominee or a
                               successor depository) at least 30 days, and not
                               more than 90 days, notice of any redemption. On
                               and after the redemption date, unless we shall
                               default in the payment of the redemption price
                               and interest accrued on the bonds to the date
                               fixed for redemption, interest on the bonds or
                               the portions of the bonds called for redemption
                               shall cease to accrue. A completed default
                               under our mortgage may occur if we fail to
                               deposit money for the redemption with the
                               trustee by the tenth day after the redemption
                               date.

                               "Adjusted treasury rate" means, with respect to
                               any redemption date:

                               .  the yield, under the heading which
                                  represents the average for the immediately
                                  preceding week, appearing in the most
                                  recently published statistical release
                                  designated "H.15(519)" or any successor
                                  publication which is published weekly by the
                                  Board of Governors of the Federal Reserve
                                  System and which reports yields on actively
                                  traded United States Treasury securities
                                  adjusted to constant maturity under the
                                  caption "Treasury Constant Maturities," for
                                  the maturity corresponding to the comparable
                                  treasury issue (if no maturity is within
                                  three months before or after the remaining
                                  term of the bonds, yields for the two
                                  published maturities most closely
                                  corresponding to the comparable treasury
                                  issue shall be

                                      S-3
<PAGE>

                                 determined and the adjusted treasury rate
                                 shall be interpolated or extrapolated from
                                 such yields on a straight line basis,
                                 rounding to the nearest month); or

                              .  if such release (or any successor release) is
                                 not published during the week preceding the
                                 calculation date or does not contain such
                                 yields, the rate per annum equal to the
                                 semiannual equivalent yield to maturity of
                                 the comparable treasury issue, calculated
                                 using a price for the comparable treasury
                                 issue (expressed as a percentage of its
                                 principal amount) equal to the comparable
                                 treasury price for such redemption date.

                              The adjusted treasury rate shall be calculated
                              on the third business day preceding the
                              redemption date.

                              "Business day" means any day other than a
                              Saturday or a Sunday or a day on which banking
                              institutions in The City of New York are
                              authorized or required by law or executive order
                              to remain closed or a day on which the corporate
                              trust office of the trustee is closed for
                              business.

                              "Comparable treasury issue" means the United
                              States Treasury security selected by the
                              independent investment banker as having a
                              maturity comparable to the remaining term of the
                              bonds that would be utilized at the time of
                              selection and in accordance with customary
                              financial practice, in pricing new issues of
                              corporate debt securities of comparable maturity
                              to the remaining term of the bonds.

                              "Comparable treasury price" means, with respect
                              to any redemption date, (1) the average of five
                              reference treasury dealer quotations for such
                              redemption date after excluding the highest and
                              lowest such reference treasury dealer quotations
                              or (2) if the independent investment banker
                              obtains fewer than five such reference treasury
                              dealer quotations, the average of all such
                              reference treasury dealer quotations.

                              "Independent investment banker" means A.G.
                              Edwards & Sons, Inc. or, if such firm is
                              unwilling or unable to select the comparable
                              treasury issue, an independent investment
                              banking institution of national standing
                              appointed by us.

                              "Reference treasury dealer" means a primary U.
                              S. government securities dealer selected by the
                              independent investment banker after consultation
                              with us.

                              "Reference treasury dealer quotations" means,
                              with respect to each reference treasury dealer
                              and any redemption date, the average, as
                              determined by the independent investment banker,
                              of the bid and asked prices for the comparable
                              treasury issue (expressed in each case as a
                              percentage of its principal amount) quoted in
                              writing to the independent investment banker by
                              such reference treasury dealer at 5:00 p.m. on
                              the third business day preceding such redemption
                              date.

                                      S-4
<PAGE>

                         SUMMARY FINANCIAL INFORMATION
                             (Dollars in thousands)

<TABLE>
<CAPTION>
                                                             Nine Months Ended
                                   Year Ended September 30,      June 30,
                                  -------------------------- -----------------
                                    1997     1998     1999     1999     2000
                                  -------- -------- -------- -------- --------
                                                                (Unaudited)
<S>                               <C>      <C>      <C>      <C>      <C>
Consolidated Statement of Income
 Data
  Operating Revenues............. $615,730 $561,987 $491,588 $435,841 $485,082
  Operating Income...............   68,944   63,464   61,489   60,363   64,101
  Net Income.....................   32,466   27,892   26,062   30,040   29,357
</TABLE>

<TABLE>
<CAPTION>
                                                             As     Percentage
                                                  Amount  Adjusted* As Adjusted
                                                 -------- --------- -----------
<S>                                              <C>      <C>       <C>
Consolidated Capitalization at June 30, 2000
  Long-term Debt................................ $204,387 $234,387      44.3%
  Redeemable Preferred Stock....................    1,763    1,763        .3
  Common Stock Equity ..........................  292,650  292,650      55.4
                                                 -------- --------     -----
    Total Capitalization ....................... $498,800 $528,800     100.0%
                                                 ======== ========     =====
</TABLE>
--------
* Adjusted to reflect the issuance of $30 million of the bonds.

                       RATIO OF EARNINGS TO FIXED CHARGES

   The following table shows our ratio of earnings to fixed charges for the
periods indicated:

<TABLE>
<CAPTION>
                Year Ended September 30,
                ------------------------                                Twelve Months
      1995       1996         1997         1998         1999         Ended June 30, 2000
      ----       ----         ----         ----         ----         -------------------
      <S>        <C>          <C>          <C>          <C>          <C>
      2.65       3.81         3.62         3.01         2.93                2.75
</TABLE>

In computing these ratios, "earnings" consist of income before income taxes and
fixed charges. "Fixed charges" consist of all interest expense and the portion
of rentals representing interest. We currently estimate the portion of rentals
representing interest to be one-third.

               BOOK-ENTRY ISSUANCE--THE DEPOSITORY TRUST COMPANY

   The bonds will be issued under a book-entry only system in the form of one
or more global securities deposited with The Depository Trust Company, New
York, New York ("DTC"). The global securities will be registered in the name of
DTC or its nominee. The following information is based solely on information
furnished by DTC:

   DTC is a limited-purpose trust company organized under the New York Banking
Law, a banking organization within the meaning of the New York Banking Law, a
member of the Federal Reserve System, a clearing corporation within the meaning
of the New York Uniform Commercial Code, and a clearing agency registered
pursuant to the provisions of Section 17A of the Securities Exchange Act of
1934.

   DTC holds securities that its participants deposit with DTC. DTC also
facilitates the settlement among participants of securities transactions, such
as transfers and pledges, in deposited securities through electronic
computerized book-entry changes in participants' accounts, thereby eliminating
the need for physical movement of securities certificates. Direct participants
include securities brokers and dealers, banks, trust companies, clearing
corporations, and certain other organizations. DTC is owned by a number of its
direct participants and

                                      S-5
<PAGE>

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, called indirect participants, 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. The rules applicable to DTC and its participants are on file with
the Securities and Exchange Commission.

   Purchases of the bonds under DTC's systems must be made by or through direct
participants, who will receive a credit for the bonds on DTC's records. The
beneficial ownership interest of each actual purchaser of each bond is in turn
recorded on the direct and indirect participants' records. Beneficial owners
will not receive written confirmation from DTC of their purchase, but 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 they purchased. Transfers of ownership interest in
the bonds are entered on the books of participants acting on behalf of
beneficial owners. Beneficial owners will not receive certificates representing
their ownership interest in the bonds, except if use of the book-entry only
system for the bonds is discontinued.

   To facilitate subsequent transfers, all bonds deposited by direct
participants with DTC will be registered in the name of DTC's partnership
nominee, Cede & Co. The deposit of bonds with DTC and their registration in the
name of Cede & Co. will effect no change in beneficial ownership. DTC will have
no knowledge of the actual beneficial owners of the bonds. DTC's records will
reflect only the identity of the direct participants to whose accounts such
bonds are credited, who may or may not be the beneficial owners. The
participants will remain responsible for keeping account of their holdings on
behalf of their customers.

   Giving 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.

   If any of the bonds being offered are redeemable prior to the maturity date,
redemption notices shall be sent to Cede & Co. If less than all of the bonds
being offered are being redeemed, DTC's practice is to determine by lot the
amount of the interest of each direct participant to be redeemed.

   DTC and Cede & Co. will not consent or vote with respect to the bonds. Under
its usual procedures, DTC will mail an omnibus proxy to us as soon as possible
after the record date. The omnibus proxy will assign Cede & Co.'s consenting or
voting rights to those direct participants to whose accounts the bonds are
credited on the record date (identified in a listing attached to the omnibus
proxy).

   Principal, premium, if any, and interest payments on the bonds will be made
to DTC. DTC's practice is to credit direct participants' accounts on the
payable 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 payable 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 the participant and not of DTC,
any underwriter, or us, subject to any statutory or regulatory requirements as
may be in effect from time to time. Payment of principal and interest to DTC is
our responsibility. Disbursement of such payments to direct participants is the
responsibility of DTC, and disbursement of such payments to the beneficial
owners is the responsibility of direct and indirect participants.

   DTC may discontinue providing its services as securities depository for the
bonds at any time by giving us and the trustee reasonable notice. If that
occurs and a successor securities depository is not obtained, or if we decide
to discontinue using DTC's book-entry only transfer system, or a completed
default under our mortgage has occurred and is continuing and payment of
principal and accrued interest on all of our outstanding bonds is due and
owing, bond certificates will be printed and delivered.

                                      S-6
<PAGE>

                                  UNDERWRITING

   Subject to the terms and conditions set forth in the underwriting agreement,
we have agreed to sell and A.G. Edwards & Sons, Inc. has agreed to purchase $30
million principal amount of the bonds.

   Under the terms and conditions of the underwriting agreement, the
underwriter agrees to take and pay for all the bonds, if any are taken.

   The underwriter proposes to offer the bonds in part directly to purchasers
at the initial public offering price set forth on the cover page of this
prospectus supplement and in part to certain securities dealers at that price
less a concession of .50% of the principal amount of the bonds. After we
release the bonds for sale to the public, the underwriter may from time to time
vary the offering price and other selling terms.

   The bonds constitute a new issue of securities with no established trading
market. The underwriter has advised us that it intends to make a market in the
bonds but the underwriter has not obligated itself to do so and may discontinue
market making at any time without notice. We can give you no assurance as to
the liquidity of the trading market for the bonds.

   The underwriter is permitted to engage in certain transactions that maintain
or affect the price of the bonds. Such transactions may include purchases to
cover short positions created by the underwriter in connection with the
offering. If the underwriter creates a short position in the bonds in
connection with the offering by selling bonds in an aggregate principal amount
that exceeds the amount set forth on the cover page of this prospectus
supplement, it may reduce that short position by purchasing bonds in the open
market. In general, purchases of a security to reduce a short position could
cause the price of the security to be higher than it might be in the absence of
such purchases.

   Neither the underwriter nor we make any representation or prediction as to
the direction or magnitude of any effect that the transactions described above
may have on the price of the bonds. In addition, neither the underwriter nor we
make any representation that the underwriter will engage in such transactions
or that, if it engages in such transactions, it will not discontinue such
transactions without notice.

   The underwriter has engaged, and in the future may engage, in investment
banking transactions with, and the provision of services to, our affiliates and
us in the ordinary course of business.

   We have agreed to indemnify the underwriter against certain liabilities,
including liabilities under the Securities Act of 1933.

                                 LEGAL MATTERS

   The legality of the bonds will be passed on for us by Gerald T. McNeive,
Jr., our Senior Vice President--Finance and General Counsel, and for the
underwriter by Winthrop, Stimson, Putnam & Roberts, New York, New York.

                                      S-7
<PAGE>

PROSPECTUS


                                  $350,000,000


                              LACLEDE GAS COMPANY


                              First Mortgage Bonds


   We may offer from time to time our first mortgage bonds.

   We will provide specific terms of any first mortgage bonds we offer,
including their offering prices, interest rates and maturities, in supplements
to this prospectus. The supplements may also add, update or change information
contained in this prospectus. You should read this prospectus and any
supplements carefully.

   We may offer our first mortgage bonds directly or through underwriters,
agents or dealers. The supplements to this prospectus will describe the terms
of any particular plan of distribution, including any underwriting
arrangements. The "Plan of Distribution" section of this prospectus also
provides more information on this topic.

   Our principal executive offices are located at 720 Olive Street, St. Louis,
Missouri 63101 and our telephone number is (314) 342-0500.


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


    NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
  COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF
  THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY
                             IS A CRIMINAL OFFENSE.


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


                  The date of this Prospectus is July 24, 2000

<PAGE>

                               Table of Contents

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Laclede Gas Company........................................................   3
Where You Can Find More Information........................................   3
Ratio of Earnings to Fixed Charges.........................................   4
Use of Proceeds............................................................   4
Description of First Mortgage Bonds........................................   4
Plan of Distribution.......................................................   9
Experts....................................................................  10
Legal Opinions.............................................................  10
</TABLE>

                                       2
<PAGE>

                              Laclede Gas Company

   We are a public utility that distributes and transports natural gas. We
serve approximately 637,000 customers as of March 31, 2000 in the City of St.
Louis, St. Louis County and parts of eight other counties in eastern Missouri
and are subject to the jurisdiction of the Missouri Public Service Commission.
Generally, we sell gas for househeating, certain other household uses, and
commercial and industrial space heating. In addition, we operate underground
natural gas storage fields and transport and store liquid propane. We have also
invested in other minor, non-utility businesses

   For the three months ended March 31, 2000, we had operating utility revenues
of $230 million, approximately 63% of which came from sales to residential
customers and 25% from sales to commercial and industrial customers. The
balance of our utility operating revenues are primarily attributable to our
off-system sales, gas supply incentive plan and transportation service. Due to
the seasonal nature of our business, earnings are typically concentrated in the
first six months of the fiscal year, which generally corresponds with the
heating season.

                      Where You Can Find More Information

   We file annual, quarterly and special reports, proxy statements and other
information with the Securities and Exchange Commission. You may read and copy
any document that we file at the SEC's Public Reference Room at 450 Fifth
Street, N.W., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for
information on the operation of the Public Reference Room. Our SEC filings also
are available to you at the SEC's website at "http://www.sec.gov."

   The SEC allows us to "incorporate by reference" the information we file with
them, which means that we can disclose important information to you by
referring you to those documents. The information incorporated by reference is
an important part of this prospectus. We are incorporating by reference the
documents listed below and any future filings we make with the SEC under
Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 until
we sell all of the first mortgage bonds offered by this prospectus or they are
removed from registration by means of a post-effective amendment. Any of those
future filings will update, supercede and replace the information contained in
any documents incorporated by reference in this prospectus at the time of the
future filings.

  .  Annual Report on Form 10-K for the fiscal year ended September 30, 1999.

  .  Quarterly Reports on Form 10-Q for the fiscal quarters ended December
     31, 1999 and March 31, 2000.

  .  Current Reports on Form 8-K filed on October 29, 1999 and January 28,
     2000.

   You may request a copy of these filings, at no cost, by writing or
telephoning us at the following address and phone number:

                              Corporate Secretary
                              Laclede Gas Company
                                720 Olive Street
                           St. Louis, Missouri 63101
                                  314-342-0531

   You should rely only on the information contained in, or incorporated by
reference in, this prospectus and any prospectus supplement. We have not, and
any underwriters, agents or dealers have not, authorized anyone else to provide
you with different information. We are not, and any underwriters, agents or
dealers are not, making an offer of these securities in any state where the
offer is not permitted. You should not assume that the information incorporated
in this prospectus and any prospectus supplement is accurate as of any date
other than the date on the front of such documents.

                                       3
<PAGE>

                       Ratio of Earnings to Fixed Charges

   The following table shows our ratio of earnings to fixed charges for the
periods indicated:

<TABLE>
<CAPTION>
                                       Fiscal Years Ended September 30,
                                   --------------------------------------------------------
    Twelve Months ended
       March 31, 2000              1999         1998         1997         1996         1995
    -------------------            ----         ----         ----         ----         ----
       <S>                         <C>          <C>          <C>          <C>          <C>
            2.79                   2.93         3.01         3.62         3.81         2.65
</TABLE>

                                Use of Proceeds

   Except as may be set forth in any prospectus supplement, the net proceeds
from the sale of our first mortgage bonds will be used to reduce short-term
debt, to redeem or discharge certain maturing long-term indebtedness, to
finance a portion of our capital expenditures, to reimburse our treasury, for
corporate development purposes including, without limitation, acquisitions made
by us, and for other general corporate purposes.

                      Description of First Mortgage Bonds

   General. The first mortgage bonds offered by this prospectus are to be
issued under our Mortgage and Deed of Trust, dated as of February 1, 1945, to
Mississippi Valley Trust Company, as trustee. State Street Bank and Trust
Company of Missouri, N.A., is the current trustee. The Mortgage and Deed of
Trust as supplemented and amended and as may be further supplemented and
amended is referred to as the "Mortgage." The following description sets forth
certain general terms and provisions of our first mortgage bonds and the
Mortgage. You should read the Mortgage for provisions that may be important to
you. We will describe the particular terms of any series of first mortgage
bonds and provisions that vary from those described below in one or more
prospectus supplements.

   The prospectus supplement relating to any series of first mortgage bonds
being offered will include specific terms relating to that offering. These
terms will include any of the following terms that apply to that series:

  .  the date or dates on which the principal of the first mortgage bonds
     will be payable and how it will be paid;

  .  the rate or rates at which the first mortgage bonds will bear interest;

  .  the place for payment and for the registration and transfer of the first
     mortgage bonds;

  .  the date or dates from which interest on the first mortgage bonds will
     accrue, the interest payment dates on which interest will be paid, and
     the record dates for interest payments;

  .  any date or dates on which, and the price or prices at which, the first
     mortgage bonds may be redeemed at our option and any restrictions on
     such redemption;

  .  any sinking fund or other provisions or options held by holders of first
     mortgage bonds that would obligate us to repurchase or otherwise redeem
     the first mortgage bonds; and

  .  any other terms of the first mortgage bonds not inconsistent with terms
     of the Mortgage.

   Payment and Paying Agent. Interest on the first mortgage bonds payable on
the applicable interest payment date will be paid to the person in whose name
the first mortgage bond is registered at the close of business on the record
date for the interest payment date. However, if we default in the payment of
interest on any first mortgage bond, the defaulted interest will be paid to the
person in whose name the first mortgage bond is registered on the date of
payment of such defaulted interest. (See Supplemental Indenture Section 2.7.)

   Unless otherwise specified in the prospectus supplement, principal and
interest on first mortgage bonds at maturity will be paid upon presentation of
the first mortgage bonds at the corporate trust office of the trustee in The
City of New York as paying agent for us. We may change the place of payment on
the first mortgage bonds, may appoint one or more additional paying agents
(including us) and may remove any paying agent, all at our discretion. (See
Mortgage Sections 9.03 and 9.04.)

                                       4
<PAGE>

   Registration and Transfer. The first mortgage bonds will be issued only as
fully registered bonds without coupons and in the denomination of $1,000, and,
at our option, in any multiple or multiples of $1,000 and will be exchangeable
for other first mortgage bonds of the same series in other authorized
denominations, for a like aggregate principal amount. The Mortgage allows us at
our option to charge up to two dollars per first mortgage bond for a transfer
or exchange as well as a sum sufficient to cover any applicable taxes or other
governmental charges in either case. (See Mortgage Section 2.05.) Unless
otherwise specified in the applicable prospectus supplement, transfers and
exchanges of the first mortgage bonds may be made at State Street Bank and
Trust Company of Missouri, N.A., One Metropolitan Square, St. Louis, Missouri
63101. We are not required to make transfers or exchanges of first mortgage
bonds:

  .  for a period of ten days prior to an interest payment date;

  .  for a period of fifteen days prior to the selection of first mortgage
     bonds for redemption; or

  .  called or selected for redemption in full.

(See Supplemental Indenture Section 2.8 and Mortgage Section 2.05.)

   Satisfaction and Discharge. We will be discharged from our obligations on
the first mortgage bonds, or any portion of the principal amount of the first
mortgage bonds, if we irrevocably deposit with the trustee sufficient cash to
pay the principal, or portion of principal, interest and any other sums when
due on the first mortgage bonds at their maturity, stated maturity date or
redemption. (See Mortgage Section 19.01.)

   The Mortgage will be deemed satisfied and discharged when no first mortgage
bonds issued under the Mortgage remain outstanding and when we have paid all
other sums payable by us under the Mortgage. (See Mortgage Section 19.01.)

   Consolidation, Merger and Sale of Assets. The Mortgage does not prevent our
consolidation with or merger into another corporation or our sale or lease of
all or substantially all of the mortgaged property to a corporation provided:

  .  we effect the transaction so as to preserve and not impair the lien of
     the Mortgage;

  .  any lease is subject to immediate termination by (a) us or the trustee
     at any time during a completed default under the Mortgage and (b) a
     purchaser of the property at a sale under the Mortgage; and

  .  the payment of the principal and interest of all first mortgage bonds
     issued under the Mortgage and the performance and observance of all of
     our covenants and conditions in the Mortgage are expressly assumed by
     the successor corporation.

(See Mortgage Section 17.01.)

The successor corporation may exercise our same powers and rights under the
Mortgage. The Mortgage will not become a lien upon any of the property or
franchises of the successor corporation, except:

  .  property which the successor corporation may acquire or construct which
     becomes an integral part of the property covered by the Mortgage;

  .  property used by the successor corporation as the basis under the
     Mortgage for the issuance of first mortgage bonds; and

  .  franchises, repairs and additional property as may be acquired, made or
     constructed by the successor corporation (a) to maintain, renew and
     preserve the mortgaged property or (b) in pursuance of some covenant or
     agreement under the Mortgage.

(See Mortgage Sections 17.02 and 17.03.)

   The Mortgage does not restrict transactions in which we are the surviving
entity. (See Mortgage Section 17.01.)

                                       5
<PAGE>

   Eminent Domain Provision. If any governmental body or agency exercises any
right which it may have through eminent domain or otherwise to purchase or
designate a purchaser of all or substantially all of the mortgaged property, or
if we sell all or substantially all of such property to any governmental body
or agency, then we shall have the right to redeem all first mortgage bonds
outstanding under the Mortgage. The first mortgage bonds would be redeemed at
their principal amounts plus accrued interest to the date of redemption
together with any premiums as may be required. We covenant that in any of such
events we will deposit with the trustee an amount in cash as needed so that all
moneys then held by the trustee shall be sufficient to redeem all first
mortgage bonds outstanding under the Mortgage. The trustee will then take such
steps as may be necessary to effect the redemption. The trustee will use the
moneys so deposited with or held by it for the redemption. If we fail to take
any steps necessary to effect the prompt redemption of the first mortgage
bonds, the trustee shall have the power in our name, or otherwise, to take such
steps. The trustee, however, is under no obligation to take any such steps
unless the amount of cash on deposit with the trustee shall be sufficient to
effect the redemption. (See Mortgage Section 13.06.)

   Priority and Security. The Mortgage creates a continuing lien to secure the
payment of the principal of, and interest on, all first mortgage bonds issued
under the Mortgage, which are in all respects equally and ratably secured
without preference, priority or distinction. The lien of the Mortgage covers
substantially all of our properties (real, personal and mixed) and franchises,
whether now owned or hereafter acquired, with certain exceptions, including:

  .  cash,

  .  shares of stock,

  .  obligations (including bonds, notes and other securities),

  .  property acquired for the purpose of sale or resale in the usual course
     of business or for consumption in the operation of our properties,

  .  construction equipment acquired for temporary use,

  .  vehicles and automobiles, and

  .  all judgments, accounts and choses in action.

The lien of the Mortgage is subject to certain permitted liens and
encumbrances:

  .  restrictions, exceptions and reservations of easements, rights of way or
     otherwise contained in any and all deeds and/or other conveyances under
     or through which we claim title thereto;

  .  with respect to property acquired since the execution of the Mortgage,
     all defects and limitations of title and all other encumbrances existing
     at the time of such acquisition, including any purchase money mortgage
     or lien created at the time of acquisition;

  .  defects of title with respect to certain real estate of minor importance
     acquired by us since 1945;

  .  liens and deeds of trust on our leasehold estate at our general offices;
     and

  .  excepted encumbrances as defined in the Mortgage.

(See Mortgage Section 1.06 and Granting Clauses.)

   Maintenance and Improvement Fund. As long as any first mortgage bonds are
outstanding under the Mortgage, we must pay annually to the trustee cash equal
to 2 3/4% of the average amount of our gross property account (see Mortgage
Section 9.07III) less certain credits. These credits consist of:

  .  credit for ordinary maintenance and repairs to the mortgaged property in
     the calendar year in question;

                                       6
<PAGE>

  .  credit for expenditures since August 31, 1942 for property additions
     that have not been made the basis for the issuance of first mortgage
     bonds, for a prior credit or as to which the right to have first
     mortgage bonds authenticated has been waived (this credit is limited to
     the cost of mortgaged property retired subsequent to August 31, 1942);

  .  credit for property additions which could be the basis for the issuance
     of first mortgage bonds, but which first mortgage bonds have not yet
     been issued;

  .  credit for outstanding first mortgage bonds surrendered to the trustee
     for cancellation; and

  .  credit up to $2,000,000 for the payment of certain debentures which were
     issued in 1945 and have now been paid.

   If the credits taken exceed the amount of the annual payment which would
otherwise be required, the excess credits may be carried forward from year to
year. We may choose to use these excess credits or to deposit cash into the
fund. Any cash so deposited may be withdrawn on the basis of those credits or
used to redeem first mortgage bonds. Any cash not so withdrawn or used within
three years from the receipt thereof by the trustee shall be used by the
trustee to redeem first mortgage bonds. The credit balance which is shown on
the most recent certificate, which was filed in 2000 for the calendar year 1999
and may, therefore, be carried forward, is $78,764,570. (See Mortgage Section
9.07.)

   Issuance of Additional First Mortgage Bonds. The aggregate amount of first
mortgage bonds which may be issued under the Mortgage is unlimited. The first
mortgage bonds of each series shall be of such denominations, date, maturity
and interest rate and may have such redemption or sinking fund provisions and
such other terms as our board of directors may determine. Sinking fund
provisions for first mortgage bonds of one series may be inapplicable to first
mortgage bonds of another series.

   The Mortgage permits the issuance of additional first mortgage bonds under
Articles VI, VII or VIII.

   Under Article VI, first mortgage bonds may be issued against unfunded
property additions in a principal amount not exceeding 60% of the cost or fair
value thereof, whichever is less, after making certain adjustments. (See
Mortgage Article VI and Section 1.04.) Unfunded property additions, at March
31, 2000, amounted to $416,233,107. The Mortgage (Section 6.05) requires, as a
prerequisite to the authentication of first mortgage bonds under Article VI,
net earnings (as defined) for any 12 consecutive months within the 15 preceding
months at least twice the amount of the annual interest requirements on all
first mortgage bonds that will be outstanding under the Mortgage after such
authentication. Alternatively, we may deliver a certificate to the trustee that
shows our net earnings after provisions for depreciation, depletion and
amortization of property, for any 12 consecutive months within the 15 months
preceding the proposed issuance date of the additional first mortgage bonds, at
least 2 1/4 times the amount of total annual interest charges on our funded
debt, including the additional first mortgage bonds to be issued. Funded debt
means all of our debt with a term of at least one year. (See Supplemental
Indenture Section 4.3 or 5.4, as applicable.)

   Article VII allows the issuance of first mortgage bonds based upon the
retirement of first mortgage bonds previously outstanding. The principal amount
of first mortgage bonds issued under Article VII may not exceed the principal
amount of first mortgage bonds previously issued and retired which have not
been made the basis of certain credits. As of June 30, 2000, $47 million of
previously issued and retired first mortgage bonds are available to support the
issuance of additional first mortgage bonds. The Mortgage also provides that so
long as any of the first mortgage bonds offered by this prospectus are
outstanding additional first mortgage bonds may not be issued on the basis of
first mortgage bonds which were taken as a credit against any sinking fund or
as a credit against the annual maintenance and improvement payment. (See
Mortgage Section 7.01 and Supplemental Indenture Section 5.3.)

   The Mortgage also permits the issuance of additional first mortgage bonds
under Article VIII of a principal amount equal to an amount of cash deposited
with the trustee. A prerequisite to the authentication of

                                       7
<PAGE>

first mortgage bonds under this Article is the delivery of a net earnings
certificate like that required under Article VI. (See Mortgage Section 8.01.)
We may also replace the net earnings certificate with the alternative form
similarly allowed under Article VI. We may later withdraw the cash after
substituting either property additions or first mortgage bonds previously
retired. In such case, we waive the right to issue other first mortgage bonds
of a principal amount equal to the amount of cash withdrawn. (See Mortgage
Section 8.02.)

   Release and Substitution of Property. Unless we are in default under the
Mortgage, property may be released against:

  .  cash or, to a limited extent, purchase money mortgages,

  .  property additions, and

  .  the waiver of the right to issue first mortgage bonds.

Any cash deposited may be withdrawn upon the basis of property additions and
the waiver of the right to issue first mortgage bonds on the basis of property
additions. The Mortgage contains special provisions with respect to pledged
prior lien bonds. (See Mortgage Articles XI and XIII.)

   Events of Default and Remedies. A "completed default" under the Mortgage
means any of the following:

  .  failure to pay the principal of any first mortgage bond when due,
     whether at its maturity as stated therein or by declaration, redemption
     or otherwise;

  .  failure to pay interest on any first mortgage bond within 60 days of
     when it is due;

  .  certain events involving our bankruptcy, insolvency or reorganization
     for a period of 90 days or more; or

  .  failure to perform any covenant, agreement or condition in the Mortgage
     within 90 days of notice thereof to us from the trustee.

   Article XIV of the Mortgage provides that if a completed default happens,
the trustee may, and upon written request of the holders of a majority in
principal amount of the first mortgage bonds then outstanding will, declare the
principal and accrued interest then owing immediately due and payable. However,
after that declaration but before any sale under that declaration, the holders
of a majority in principal amount of all outstanding first mortgage bonds may,
under certain circumstances, rescind and annul the declaration if all
agreements with respect to the completed default have been fully performed and
all interest in arrears and expenses and charges have been paid. Upon the
occurrence of a completed default, the trustee may take possession of and
manage and operate the property. In addition, the trustee may sell all of the
property, or those parcels as the holders of a majority in principal amount of
the first mortgage bonds outstanding may determine.

   Subject to the provisions of the Mortgage relating to the duties of the
trustee, if an event of a completed default occurs and continues, the trustee
is under no obligation to exercise any of its rights or powers under the
Mortgage unless the holders of a majority in principal amount of the first
mortgage bonds then outstanding have requested the trustee to take action and
have adequately indemnified the trustee. In addition, the holders of a majority
in principal amount of the first mortgage bonds then outstanding have the right
to direct the time, method and place of conducting any proceedings for any
remedy available to the trustee and to exercise any trust or power conferred on
the trustee.

   The Mortgage provides that the trustee will, within 90 days after the
occurrence of a completed default, give notice to the holders of the default,
unless the default is cured before the giving of the notice. In the case of a
default in the payment of the principal of or interest on any of the first
mortgage bonds, however, the trustee is protected in withholding notice if it
determines in good faith that the withholding of the notice is in the interest
of the holders of first mortgage bonds.

                                       8
<PAGE>

   No holder of first mortgage bonds has any right to institute any suit,
action or proceeding in equity or at law for the foreclosure of the Mortgage,
for the execution of any trust, for the appointment of a receiver or any other
remedy unless:

  .  prior notice is given by such holder to the trustee of a completed
     default;

  .  holders of at least 25% of the first mortgage bonds then outstanding
     request the trustee, and offer it reasonable opportunity, to proceed and
     offer it adequate security and indemnity; and

  .  the trustee for 60 days after its receipt of the notice fails or refuses
     to institute such action.

   The Mortgage also provides that a court may in its discretion require, in
any suit to enforce any provision of the Mortgage or against the trustee, the
filing by the party filing the suit of an undertaking to pay the costs of the
suit. The court may also assess reasonable costs including attorneys' fees
against any party to the suit. These provisions do not apply, however, to a
suit filed by the trustee or any bondholder for the payment of principal or
interest on any first mortgage bond on or after the stated due date of the
first mortgage bond.

   Annual Notice to Trustee. We are required to furnish annually to the trustee
a certificate as to compliance with all conditions and covenants under the
Mortgage. We must provide similar certificates to the trustee upon each release
of property from the lien of the Mortgage and upon each issuance of additional
first mortgage bonds.

   The Trustee. State Street Bank and Trust Company of Missouri, N.A. is the
trustee under the Mortgage. It is presently contemplated that State Street Bank
and Trust Company, an affiliate of the trustee under the Mortgage, will be the
trustee under one or more indentures under which we may issue unsecured debt
securities.

   Modification of Mortgage. Article XX of the Mortgage contains provisions
permitting modification of the Mortgage by consent of the holders of 66 2/3% in
principal amount of all first mortgage bonds whose rights are affected by such
modification. However, no modification may:

  .  extend the maturity of the principal of any first mortgage bonds,

  .  reduce the rate of interest on any first mortgage bond,

  .  modify any other term of payment of principal and interest,

  .  deprive to any holder of a first mortgage bond the mortgage lien,

  .  create a lien on the mortgaged property ranking equal or prior to the
     mortgage lien, or

  .  reduce the percentage required for modification,

without the consent of any holder of first mortgage bonds affected by the
modification. Holders of at least 75% in principal of the first mortgage bonds
outstanding (including first mortgage bonds offered by this prospectus),
however, may consent to the postponement of any interest payment for a period
not exceeding three years from its due date.

                              Plan of Distribution

   We may sell the first mortgage bonds in one or more series in any of three
ways: (i) through underwriters or dealers; (ii) through agents; or (iii)
directly to a limited number of purchasers or to a single purchaser.

   Through Underwriters or Dealers. If underwriters are used in the sale, the
first mortgage bonds 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 the initial public offering price or at varying
prices

                                       9
<PAGE>

determined at the time of the sale. The first mortgage bonds may be offered to
the public either through underwriting syndicates represented by one or more
managing underwriters or directly by one or more managing underwriters. The
underwriter or underwriters with respect to first mortgage bonds will be named
in the prospectus supplement relating to that offering and, if an underwriting
syndicate is used, the managing underwriter or underwriters will be set forth
on the cover page of the prospectus supplement. Unless otherwise set forth in
the prospectus supplement, the obligations of the underwriters to purchase the
first mortgage bonds will be subject to certain conditions precedent, and the
underwriters will be obligated to purchase all of the first mortgage bonds if
any are purchased.

   Through Agents. First mortgage bonds may be sold through agents designated
by us from time to time. The prospectus supplement will set forth the name of
any agent involved in the offer or sale of the first mortgage bonds as well as
any commissions payable by us to the agent. Unless otherwise indicated in the
prospectus supplement, any agent will be acting on a reasonable best efforts
basis for the period of its appointment.

   Directly. We may sell the first mortgage bonds directly to one or more
purchasers. In this case, no underwriters or agents would be involved.

   General Information. The prospectus supplement for any first mortgage bonds
will set forth the terms of the offering of those first mortgage bonds,
including: (a) the name or names of any underwriters, dealers or agents; (b)
the purchase price of those first mortgage bonds and the proceeds to us from
their sale; (c) any underwriting discounts, agents' commissions and other items
constituting underwriting compensation; (d) any initial public offering price;
and (e) any discounts or concessions allowed or reallowed or paid to dealers.
Any initial public offering price and any discounts or concessions allowed or
reallowed or paid to dealers may be changed from time to time.

   If so indicated in the prospectus supplement for any first mortgage bonds,
we may authorize agents, underwriters or dealers to solicit offers by certain
specified institutions to purchase those first mortgage bonds from us at the
initial public offering price set forth in the prospectus supplement pursuant
to delayed delivery contracts providing for payment and delivery on a specified
date in the future. Those contracts will be subject to those conditions set
forth in the prospectus supplement, and the prospectus supplement will set
forth the commission payable for solicitation of those contracts.

   Agents, underwriters and dealers may be entitled under agreements entered
into with us to indemnification by us against certain civil liabilities,
including certain liabilities under the Securities Act of 1933 or to
contribution by us with respect to payments which those agents, underwriters
and dealers may be required to make in respect of those liabilities.

                                    Experts

   The financial statements incorporated in this prospectus by reference from
our Annual Report on Form 10-K for the year ended September 30, 1999 have been
audited by Deloitte & Touche LLP, independent auditors, as stated in their
report, which is incorporated herein by reference and has been so incorporated
in reliance upon the report of such firm given upon their authority as experts
in accounting and auditing.

                                 Legal Opinions

   Opinions as to the legality of the first mortgage bonds to be issued will be
delivered by Gerald T. McNeive, Jr., our Senior Vice President--Finance and
General Counsel, and by Winthrop, Stimson, Putnam & Roberts, New York, New York,
counsel for the underwriters, dealers or agents.

                                       10
<PAGE>

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You should rely only on the information contained or incorporated by reference
in this prospectus supplement and the accompanying prospectus. We have not
authorized anyone to provide you with different information, and if you receive
any unauthorized information, you should not rely on it. We are not making an
offer of these securities in any place where the offer is not permitted. You
should not assume that the information contained or incorporated by reference
in this prospectus supplement or the accompanying prospectus is accurate as of
any date other than the date on the front of the applicable document. If
information in this prospectus supplement is inconsistent with the prospectus,
this prospectus supplement will apply and will supersede that information in
the prospectus.

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

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
                             Prospectus Supplement

<S>                                                                         <C>
The Company................................................................ S-2
Description of the Bonds................................................... S-2
Summary Financial Information.............................................. S-5
Ratio of Earnings to Fixed Charges......................................... S-5
Book-Entry Issuance--The Depository Trust Company.......................... S-5
Underwriting............................................................... S-7
Legal Matters.............................................................. S-7

                                   Prospectus

Laclede Gas Company........................................................   3
Where You Can Find More Information........................................   3
Ratio of Earnings to Fixed Charges.........................................   4
Use of Proceeds............................................................   4
Description of First Mortgage Bonds........................................   4
Plan of Distribution.......................................................   9
Experts....................................................................  10
Legal Opinions.............................................................  10
</TABLE>

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                                  $30,000,000

                              LACLEDE GAS COMPANY

                              First Mortgage Bonds
                      7.90% Series due September 15, 2030


                                     [LOGO]

                           A.G. Edwards & Sons, Inc.


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