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                                                                     EXHIBIT 4.6

                          CERTIFICATE OF INCORPORATION

                                       OF

                            KCS ENERGY SERVICES, INC.

                              ********************

             Pursuant to Section 102 of the General Corporation Law

                            of the State of Delaware

         The undersigned, a natural person of legal age, for the purpose of
forming a corporation pursuant to the General Corporation Law of the State of
Delaware, does hereby certify and set forth:

         1. Corporate Name. The name of the corporation is:

            KCS Energy Services, Inc.

         2. Registered Office and Agent. The address of its registered office in
the State of Delaware is 1209 Orange Street, Wilmington, New Castle County,
Delaware, 19801. The name of the registered agent is The Corporation Trust
Company.

         3. Purpose. The nature of the business or purposes to be conducted or
promoted is to engage in any lawful act or activity for which corporations may
be organized under the General Corporation Law of Delaware.

         4. Authorized Capital. The total number of shares of stock which the
corporation shall have authority to issue is one hundred (100), par value of
$.01 per share.

         5. Bylaws. In furtherance and not in limitation of the powers conferred
by statute, the board of directors is expressly authorized to make, alter or
repeal the bylaws of the corporation.

         6. Election of Directors. Elections of directors need not be by written
ballot unless the bylaws of the corporation so provide.

         7. Keeping of Books. The books of the corporation may be kept (subject
to any provision contained in the Delaware General Corporation Law) outside of
the State of Delaware at such place or places as may be designated from time to
time by the board of directors or in the bylaws of the corporation.

         8. Right to Amend. The corporation reserves the right to amend, alter
or repeal any provision contained in this Certificate of Incorporation, in the
manner now or hereafter prescribed by statue, and all rights conferred upon
stockholders herein are granted subject to this reservation.

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         9. Stockholders. If any action is to be taken by the stockholders
without a meeting, such action must be authorized by the unanimous written
consent signed by all of the holders of the outstanding stock.

         10. Limitation on Liability. No director of the corporation shall be
liable to the corporation or its shareholders for monetary damages for breach of
his or her fiduciary duty as director, except for liability (i) for any breach
of the director's duty of loyalty to the corporation and stockholders, (ii) for
acts of omissions not in good faith or which involve intentional misconduct or a
knowing violation of the law, (iii) under Section 174 of the Delaware General
Corporation Law, or (iv) for any transaction from which the director derived an
improper personal benefit. If the General Corporation Law of the State of
Delaware is hereafter amended to authorize corporate action further limiting or
eliminating the personal liability of directors, then the liability of a
director to the corporation shall be limited or eliminated to the fullest extent
permitted by the General Corporation Law of the State of Delaware, as so amended
from time to time.

         11. Directors. The powers of the incorporator are to terminate upon the
filing of the Certificate of Incorporation and the names and mailing addresses
of the persons who are to serve as directors until the first annual meeting of
stockholders or until their successors are elected and qualified are as follows:

<Table>
<Caption>
                              NAME                               MAILING ADDRESS
                              ----                               ---------------
<S>                                                         <C>
                James W. Christmas                          379 Thornall Street
                                                            Edison, New Jersey  08837

                Henry A. Jurand                             379 Thornall Street
                                                            Edison, New Jersey  08837

                Harry Lee Stout                             5555 San Felipe, Suite 1200
                                                            Houston, Texas  77056
</Table>

         12. Incorporator. The name and mailing address of the incorporator of
the corporation is:

         Jeannette Rutkowski
         379 Thornall Street
         Edison New Jersey  08837

         I, THE UNDERSIGNED, being the incorporator hereinbefore named, for the
purpose of forming a corporation pursuant to the General Corporation Law of the
State of Delaware, do make this certificate, hereby declaring and certifying
that this is my act and deed and the facts herein stated are true, and
accordingly have h hereunto set my hand this 23rd day of September, 1996.

                                    /s/ Jeannette Rutkowski
                                    --------------------------------------------
                                    Jeannette Rutkowski, Paralegal<PAGE>
                                                                     EXHIBIT 4.7

                            CERTIFICATE OF AMENDMENT
                                       TO
                          CERTIFICATE OF INCORPORATION
                                       OF
                            KCS ENERGY SERVICES, INC.

KCS Energy Services, Inc., a corporation organized and existing under the
General Corporation Law of the State of Delaware (the "Corporation") does hereby
certify that provision for the making of the following amendment to the
Certificate of Incorporation of the Corporation is contained in an Order (the
"Order") dated January 30, 2001 of the United States Bankruptcy Court for the
District of Delaware (the "Bankruptcy Court") in In re KCS Energy, Inc., et al.,
Debtors, Case No. 00-0028 (PJW) and Case Nos. 00-0310 (PJW) through  00-0318
(PJW) confirming the KCS Energy, Inc. et al., Debtors Chapter 11 Plan of
Reorganization:

                  A new Article 13 is hereby added to the end of the Certificate
                  of Incorporation:

         "13.     Notwithstanding anything contained in this Certificate of
                  Incorporation to the contrary, the Corporation shall not
                  authorize or issue any non-voting equity securities or
                  authorize or issue any classes of securities possessing voting
                  power, in either case without complying with the provisions of
                  Title 11 United States Code Section 1123(a)(6)."

                  The undersigned persons certify that, pursuant to the Order of
the Bankruptcy Court, the Corporation, this 2nd day of February, 2001, has
caused this Certificate of Amendment to be signed by its President and attested
by its Secretary, and affirm that the statements contained herein are true.

ATTEST:                                          KCS ENERGY SERVICES, INC.

/s/ Frederick Dwyer                              /s/ Harry Lee Stout
-----------------------------                    ------------------------------
Frederick Dwyer, Secretary                       Harry Lee Stout, President<PAGE>
                                                                     EXHIBIT 4.8

                          CERTIFICATE OF INCORPORATION

                                     OF THE

                            CITY GAS SERVICE COMPANY

         This is to Certify, That we, HARRY E. CARVER, LELAND B. PETTIT and
ELLSWORTH J. SCHUSTER, do hereby associate ourselves into a corporation under
and by virtue of Title 14 of the Revised Statutes, and do severally agree to
take the number of shares of capital stock set opposite our respective names.

         (a) The name of the corporation is:

             CITY GAS SERVICE COMPANY

         (b) The location of the principal office in this State is at
No. 57 Main Street, in the Borough of Flemington, County of Hunterdon.

         (c) The name of the Agent therein and in charge thereof, upon whom
process against this corporation may be served, is Leland B. Pettit.

         (d) The objects for which this corporation is formed are:

         To manufacture, buy, sell, lease, import, export and generally deal in
and with liquified petroleum, gas, gas appliances and other appliances,
implements, apparatus, supplies and goods, wares, merchandise, property and
commodities of every kind and description, and all articles used or useful in
connection therewith.

         To operate a gas compressor plant or plants and to engage in and
conduct the business of compressing gas into cylinders and selling cylinders of
compressed gas at wholesale and at retail.

         To install, repair and generally service heaters, heating, cooking,
power and cooling equipment, stoves, ranges, machines, refrigerators, apparatus
and appliances of all kinds.

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         To carry on manufacturing and merchandising, either at retail or
wholesale and either individually and for its own account or as agent, factor or
broker, operations of any and all kinds insofar as may be permitted by the laws
of the State of New Jersey.

         To buy, acquire, own, hold, maintain, operate, manage, use, develop,
improve, rent, lease, mortgage, sell, exchange, dispose and deal in real estate,
improved or unimproved, and any and all interests or rights therein.

         To erect, construct, purchase, acquire, improve, maintain, operate,
manage, lease, let, mortgage, sell and otherwise dispose of factories, works,
dwellings, buildings and structures of any and all kinds.

         To purchase, lease, operate, maintain and own similar businesses.

         To acquire and take over as a going concern and to carry on the
business of any person, firm, association or corporation engaged in any business
which this corporation is authorized to carry on, and in connection therewith to
acquire the good will and all or any of the assets and to assume or otherwise
provide for all or any of the liabilities of the owner or owners of such
business.

         To purchase, acquire, hold and dispose of, pursuant to the provisions
of sections 14:3-9, 14:3-10 and 14:3-11 of the General Corporation Act of the
State of New Jersey, the stocks, bonds and other evidence of indebtedness in any
corporation, domestic or foreign, and issue in exchange therefor its own stocks,
bonds and other obligations; to acquire by subscription, purchase or otherwise,
to hold for investment or for resale, to sell, assign, transfer, mortgage,
pledge, hypothecate or otherwise dispose of, and in all ways deal in and with
stocks, scrip, voting trust certificates, bonds, contracts, debentures,
mortgages, notes, trust receipts, certificates of indebtedness, interim receipts
and other obligations or securities of corporation, private, public,

<PAGE>
quasi-public or municipal, foreign or domestic, or of individuals; to collect
the interest and dividends on its holdings and the principal thereof when due;
to exercise all rights and privileges of or incidental to the ownership thereof
and to do all things suitable and proper for the protection, conservation and
enhancement of the value of its stocks, securities, evidence of indebtedness or
other property.

         To purchase or by any other means acquire, hold, own, use, sell,
assign, lease, mortgage or otherwise dispose of Letters Patent of the United
States of America or any foreign country, patents, patent rights, licenses,
privileges, inventions, improvements, secret processes, trade-marks and trade
names and pending applications therefor and renewals thereof which may relate to
or be useful in connection with any business of the corporation, and to expend
money in experimenting upon, testing, developing, improving, seeking to improve
and marketing the same.

         To do any business deemed advantageous to it of the same general nature
as that for which it is organized, and incidental or necessary to any of the
above-named objects.

         The corporation shall also have power to conduct its business in all
its branches, have one or more offices, and unlimitedly to hold, purchase,
mortgage and convey real and personal property in any State, Territory or Colony
of the United States and in any foreign country or place.

         (e) The total authorized capital stock of this corporation is
$100,000.00, divided into Eight Hundred (800) shares of 6% Non-voting,
cumulative preferred stock of a par value of Twenty-five Dollars ($25.00) each;
and Eight Thousand (8,000) shares of common stock of the par value of Ten
Dollars ($10.00) each.

         The preferred stock may be issued as and when the Board of Directors
shall determine and shall entitle the holders thereof to receive when and as
declared, from the surplus or net

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profits of the corporation, yearly cumulative dividends of 6% per annum on each
share of stock held by them, and no more, payable quarterly, half-yearly or
yearly on dates to be fixed by the Board of Directors.

         The Board of Directors shall have the right to create a sinking fund in
such amount of the net profits as they may deem advisable from time to time, for
the purchase, retirement or redemption of the preferred stock and to apply such
sinking fund for such purposes.

         If, in any year, dividends amounting to 6% per annum shall not be paid
on such preferred stock, the deficiency shall be a charge on the net profits of
the corporation, and shall be payable without interest, before any dividends
shall be paid or set apart for the common stock. The balance of the net profits
of the corporation, after the payment of such cumulative dividends at the rate
of 6% per annum to the holders of the preferred stock and after payments, if
any, into the sinking fund as above provided, may be distributed among the
holders of the common stock as and when the Board of Directors shall in their
discretion determine.

         In the event of the liquidation or dissolution (whether voluntary or
involuntary) or winding up of the corporation, the holders of preferred stock
shall be entitled to receive and shall be paid the par value of their preferred
shares, together with the amount of all dividends accrued or in arrears thereon,
before any amount shall be paid to the holders of the common stock. After
payment to the holders of the preferred stock of their full preferential amounts
as aforesaid, the remaining assets and funds shall be divided and paid to the
holders of the common stock according to their respective shares. If upon any
such liquidation, dissolution or winding up of this corporation, the assets and
funds distributable among the holders of the preferred stock shall be
insufficient to permit the payment in full to such holders of the preferential
amounts aforesaid, then the entire assets and funds of this corporation to be
distributed, shall be distributed among

<PAGE>

the holders of the preferred stock then outstanding, ratably in proportion to
the full preferential amounts to which they are respectively entitled.

         The preferred stock shall, at the discretion of the Board of Directors,
be subject to redemption, in whole or in part, at the price of $27.00 per share,
together with the amount of all dividends accrued or in arrears thereon, at
anytime within the first five (5) years that said stock is outstanding, and at
the price of $26.00 per share, together with the amount of all dividends accrued
or in arrears thereon, at anytime after the first five (5)years that said stock
is outstanding; provided that at least thirty (30) days notice of redemption
shall be given to the holders of record of the preferred stock to be redeemed,
which notice may be given by mail or in such manner as is fixed by the by-laws,
or by resolution of the Board of Directors. Any such redemption of preferred
stock shall be in such amount and at such place and by such method, whether by
lot or pro rata, as shall from time to time be determined by resolution of the
Board of Directors.

         No preferred stockholder shall have any pre-emptive or preferential
right of subscription to any shares of any stock of this corporation, or to any
obligations convertible into stock of this corporation, issued or sold, nor any
right of subscription to any part thereof other than such, if any, as the Board
of Directors in its discretion from time to time may determine, pursuant to the
authority hereby conferred by the Certificate of Incorporation of this
corporation, and the Board of Directors may issue stock of this corporation, or
obligations convertible into stock, without offering such issue of stock, either
in whole or in part, to the preferred stockholders of this corporation. The
acceptance of preferred stock in this corporation, shall be a waiver of any such
pre-emptive or preferential right which in the absence of this provision might
otherwise be asserted by preferred stockholders of this corporation or any of
them.

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         The holders of the shares of common stock of this corporation shall be
entitled to one vote for each share held; the holders of the shares of the
preferred stock of this corporation shall not be entitled to any vote for each
share held unless the total unpaid accrued dividends on the preferred stock
amount to 12% or more per share, in which event the holders of the preferred
stock shall have the right, at the next succeeding annual meeting, voting as one
class, by plurality vote (each share being entitled to one vote) to elections of
the directors for the following year and the holders of the common stock shall
have the right, voting as a separate class, by plurality vote (each share being
entitled to one vote), to elect the remaining directors for the said year.

         The director so elected by the preferred stockholders shall cease to be
a director when all of the accrued dividends on the preferred stock are paid,
and the Board of Directors shall immediately fill the vacancy created thereby.

         No owner or holder of the preferred stock shall be entitled to receive
notice of any meeting of stockholders unless entitled to vote thereat.

         (f) The names and post office address of the incorporators and the
number of shares subscribed for by each, the aggregate of which ($1,000.00) is
the amount of capital stock with which this company will commence business, are
as follows:

<Table>
<Caption>
             NAME                       POST OFFICE ADDRESS                           NO. OF SHARES
             ----                       -------------------                           -------------
<S>                              <C>                                                  <C>
Harry E. Carver                  150 Wyoming Avenue
                                 Maplewood, New Jersey                                  98 common

Leland B. Pettit                 57 Main Street                                          1 common
                                 Flemington, New Jersey

Ellsworth J. Schuster            57 Main Street
                                 Flemington, New Jersey                                  1 common
                                                                                        --------

                                                   Total:                              100 common
</Table>

         (g) The period of existence of this company is unlimited.
<PAGE>

                           REGULATIONS AND LIMITATIONS

         Pursuant to R.S. or N.J. 14:3-2, authority is hereby conferred upon the
Board of Directors to make and alter by-laws. By-laws so made by the Board of
Directors under the power hereby conferred, may be altered or repealed by the
stockholders.

         All corporate powers shall be exercised by the Board of Directors,
except as otherwise provided by the Statute, or by this Certificate.

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