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                                                                     EXHIBIT 3.8

                                    BY-LAWS

                                       OF

                    SITHE MID-ATLANTIC POWER SERVICES, INC.

                                   ARTICLE I
                                   OFFICERS

          SECTION 1.  REGISTERED OFFICE. -- The registered office shall be
established and maintained at c/o United Corporate Services, Inc., 15 East
North Street, Dover, Delaware 19901 and United Corporate Services, Inc. shall
be the registered agent of this corporation in charge thereof.

          SECTION 2.  OTHER OFFICES. -- The corporation may have other offices,
either within or without the State of Delaware, at such place or places as the
Board of Directors may from time to time appoint or the business of the
corporation may require.

                                   ARTICLE II
                            MEETINGS OF STOCKHOLDERS

          SECTION 1.  ANNUAL MEETINGS. -- Annual meetings of stockholders for
the election of directors and for such other business as may be stated in the
notice of the meeting, shall be held at such place, either within or without
the State of Delaware, and at such time and date as the Board of Directors, by
resolution, shall determine and as set forth in the notice of meeting.

          If the date of the annual meeting shall fall upon a legal holiday,
the meeting shall be held on the next succeeding business day. At each annual
meeting, the stockholders entitled to vote shall elect a Board of Directors and
they may transact such other corporate business as shall be stated in the
notice of the meeting.

          SECTION 2.  OTHER MEETINGS. -- Meetings of stockholders for any
purpose other than the election of directors may be held at such time and
place, within or without the State of Delaware, as shall be stated in the
notice of the meeting.

          SECTION 3.  VOTING. -- Each stockholder entitled to vote in
accordance with the terms of the Certificate of Incorporation and in accordance
with the provisions of these By-Laws shall be entitled to one vote, in person
or by proxy, for each share of stock entitled to vote held by such stockholder,
but no proxy shall be voted after three years from its date unless such proxy
provides for a longer period. Upon the demand of any stockholder, the vote for
directors and the vote upon any question before the meeting, shall be by
ballot. All elections for directors shall be decided by plurality vote; all
other questions shall be decided by majority vote except as otherwise provided
by the Certificate of Incorporation or the laws of the State of Delaware.

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       A complete list of the stockholders entitled to vote at the ensuing
election, arranged in alphabetical order, with the address of each, and the
number of shares held by each, shall be open to the examination of any
stockholder, for any purpose germane to the meeting, during ordinary business
hours, for a period of at least ten days prior to the meeting, either at a
place within the city where the meeting is to be held, which place shall be
specified in the notice of the meeting, or, if not so specified, at the place
where the meeting is to be held. The list shall also be produced and kept at
the time and place of the meeting during the whole time thereof, and may be
inspected by any stockholder who is present.

       SECTION 4.   QUORUM. - Except as otherwise required by law, by the
Certificate of Incorporation or by these By-Laws, the presence, in person or by
proxy, of stockholders holding a majority of the stock of the corporation
entitled to vote shall constitute a quorum at all meetings of the stockholders.
In case a quorum shall not be present at any meeting, a majority in interest of
the stockholders entitled to cote thereat, present in person or by proxy, shall
have power to adjourn the meeting from time to time, without notice other than
announcement at the meeting, until the requisite amount of stock entitled to
vote shall be represented, any business may be transacted which might have been
transacted at the meeting as originally noticed; but only those stockholders
entitled to vote at the meeting as originally noticed shall be entitled to vote
at any adjournment or adjournments thereof. If the adjournment is for more than
thirty (30) days, or if after the adjournment a new record date is fixed for
the adjourned meeting, a notice of the adjourned meeting shall be given to each
stockholder of record entitled to vote the meeting.

       SECTION 5.   SPECIAL MEETINGS. - Special meetings of the stockholders
for any purpose or purposes may be called by the President or Secretary, or by
resolution of the directors.

       SECTION 6.   NOTICE OF MEETINGS. - Written notice, stating the place,
date and time of the meeting, and the general nature of the business to be
considered, shall be given to each stockholder entitled to vote thereat at his
address as it appears on the records of the corporation, not less than ten nor
more than sixty days before the date of the meeting. No business other than
that stated in the notice shall be transacted at any meeting without the
unanimous consent of all the stockholders entitled to vote thereat.

       SECTION 7.   ACTION WITHOUT MEETING. - Unless otherwise provided by the
Certificate of Incorporation, any action required to be taken at any annual or
special meeting of stockholders, or any action which may be taken at any annual
or special meeting, may be taken without a meeting, without prior notice and
without a vote, if a consent in writing, setting forth the action so taken,
shall be signed by the holders of outstanding stock having not less than the
minimum number of votes that would be necessary to authorize or take such
action at a meeting at which all shares entitled to vote thereon were present
and voted. Prompt notice of the taking of the corporate action without a
meeting by less than unanimous written consent shall be given to those
stockholders who have not consented in writing.
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                                  ARTICLE III
                                   DIRECTORS

     SECTION 1.     NUMBER AND TERM. - The number of directors shall be two (2).
The directors shall be elected at the annual meeting of the stockholders and
each director shall be elected to serve until his successor shall be elected and
shall qualify. A director need not be a stockholder.

     SECTION 2.     RESIGNATIONS. - Any director, member of a committee or other
officer may resign at any time. Such resignation shall be made in writing, and
shall take effect at the time specified therein, and if no time be specified, at
the time of its receipt by the President or Secretary. The acceptance of a
resignation shall not be necessary to make it effective.

     SECTION 3.     VACANCIES - If the office of any director, member of a
committee or other officer becomes vacant, the remaining directors in office,
though less than a quorum by a majority vote, may appoint any qualified person
to fill such vacancy, who shall hold office for the unexpired term and until his
successor shall be duly chosen.

     SECTION 4.     REMOVAL. - Any director or directors may be removed either
for or without cause at any time by the affirmative vote of the holders of a
majority of all the shares of stock outstanding and entitled to vote, at a
special meeting of the stockholders called for the purpose and the vacancies
thus created may be filled, at the meeting held for the purpose of removal, by
the affirmative vote of a majority in interest of the stockholders entitled to
vote.

     SECTION 5.     INCREASE OF NUMBER. - The number of directors may be
increased by amendment of these By-Laws by the affirmative vote of a majority of
the directors, though less than a quorum, or, by the affirmative vote of a
majority in interest of the stockholders, at the annual meeting or at a special
meeting called for that purpose, and by like vote the additional directors may
be chosen at such meeting to hold office until the next annual election and
until their successors are elected and qualify.

     SECTION 6.     POWERS. - The Board of Directors shall exercise all of the
powers of the corporation except such as are by law, or by the Certificate of
Incorporation of the corporation or by these By-Laws conferred upon or reserved
to the stockholders.

     SECTION 7.     COMMITTEES. - The Board of Directors may, by resolution or
resolutions passed by a majority of the whole board, designate one or more
committees, each committee to consist of two or more of the directors of the
corporation. The board may designate one ore more directors as alternate members
of any committee, who may replace any absent or disqualified member at any
meeting of the committee. In the absence or disqualification of any member of
such committee or committees, the member or members thereof present at any such
meeting and not disqualified from voting, whether or not he or they constitute a
quorum, may unanimously appoint another member of the Board of Directors to act
at the meeting in the place of any such absent or disqualified member.

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     Any such committee, to the extent provided in the resolution of the Board
of Directors, or in these By-Laws, shall have and may exercise all the powers
and authority of the Board of Directors in the management of the business and
affairs of the corporation, and may authorize the seal of the corporation to be
affixed to all papers which may require it; but no such committee shall have
the power of authority in reference to amending the Certificate of
Incorporation, adopting an agreement of merger or consolidation, recommending
to the stockholders the sale, lease or exchange of all or substantially all of
the corporation's property and assets, recommending to the stockholders a
dissolution, or amending the By-Laws of the corporation; and unless the
resolution, these By-Laws, or the Certificate of Incorporation expressly so
provide, no such committee shall have the power or authority to declare a
dividend or to authorize the issuance of stock.

     SECTION 8.     MEETINGS. - The newly elected Board of Directors may hold
their first meeting for the purpose of organization and the transaction of
business, if a quorum be present, immediately after the annual meeting of the
stockholders; or the time and place of such meeting may be fixed by consent, in
writing, of all the directors.

     Unless restricted by the incorporation document or elsewhere in these
By-laws, members of the Board of Directors or any committee designated by such
Board may participate in a meeting of such Board or committee by means of
conference telephone or similar communications equipment allowing all persons
participating in the meeting to hear each other at the same time. Participation
by such means shall constitute presence in person at such meeting.

     Regular meetings of the Board of Directors may be scheduled by a
resolution adopted by the Board. The Chairman of the Board of the President or
Secretary may call, and if requested by any two directors, must call a special
meeting of the Board and give five days' notice by mail, or two days' notice
personally or by telegraph or cable to each director. The Board of Directors
may hold an annual meeting, without notice, immediately after the annual
meeting of stockholders.

     SECTION 9.     QUORUM. - A majority of the directors shall constitute a
quorum for the transaction of business. If at any meeting of the board there
shall be less than a quorum present, a majority of those present may adjourn
the meeting from time to time until a quorum is obtained, and no further notice
thereof need be given other than by announcement at the meeting which shall be
so adjourned.

     SECTION 10.    COMPENSATION. - Directors shall not receive any stated
salary for their services as directors or as members of committees, but by
resolution of the board a fixed fee and expenses of attendance may be allowed
for attendance at each meeting. Nothing herein contained shall be construed to
preclude any director from serving the corporation in any other capacity as an
officer, agent or otherwise, and receiving compensation therefor.

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               SECTION 11. ACTION WITHOUT MEETING. - Any action required or
permitted to be taken at any meeting of the Board of Directors, or of any
committee thereof, may be taken without a meeting, if prior to such action a
written consent thereto is signed by all members of the board, or of such
committee as the case may be, and such written consent is filed with the minutes
of proceedings of the board or committee.

                                   ARTICLE IV
                                    OFFICERS

               SECTION 1. OFFICERS. - The officers of the corporation shall be a
President, a Treasurer, and a Secretary, all of whom shall be elected by the
Board of Directors and who shall hold office until their successors are elected
and qualified. In addition, the Board of Directors may elect a Chairman, one or
more Vice-Presidents and such Assistant Secretaries and Assistant Treasurers as
they may deem proper. None of the officers of the corporation need be directors.
The officers shall be elected at the first meeting of the Board of Directors
after each annual meeting. More than two offices may be held by the same person.

               SECTION 2. OTHER OFFICERS AND AGENTS. - The Board of Directors
may appoint such other officers and agents as it may deem advisable, who shall
hold their offices for such terms and shall exercise such powers and perform
such duties as shall be determined from time to time by the Board of Directors.

               SECTION 3. CHAIRMAN. - The Chairman of the Board of Directors, if
one be elected, shall preside at all meetings of the Board of Directors and he
shall have and perform such other duties as from time to time may be assigned to
him by the Board of Directors.

               SECTION 4. PRESIDENT. - The President shall be the chief
executive officer of the corporation and shall have the general powers and
duties of supervision and management usually vested in the office of President
of a corporation. He shall preside at all meetings of the stockholders if
present thereat, and in the absence or non-election of the Chairman of the Board
of Directors, at all meetings of the Board of Directors, and shall have general
supervision, direction and control of the business of the corporation. Except as
the Board of Directors shall authorize the execution thereof in some other
manner, he shall execute bonds, mortgages and other contracts in behalf of the
corporation, and shall cause the seal to be affixed to any instrument requiring
it and when so affixed the seal shall be attested by the signature of the
Secretary or the Treasurer or Assistant Secretary or an Assistant Treasurer.

               SECTION 5. VICE-PRESIDENT. - Each Vice-President shall have such
powers and shall perform such duties as shall be assigned to him by the
directors.
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     SECTION 6.  TREASURER. - The Treasurer shall have the custody of the
corporate funds and securities and shall keep full and accurate account of
receipts and disbursements in books belonging to the corporation. He shall
deposit all moneys and other valuables in the name and to the credit of the
corporation in such depositaries as may be designated by the Board of Directors.

     The Treasurer shall disburse the funds of the corporation as may be ordered
by the Board of Directors, or the President, taking proper vouchers for such
disbursements. He shall render to the President and Board of Directors at the
regular meetings of the Board of Directors, or whenever they may request it, an
account of all his transactions as Treasurer and of the financial condition of
the corporation. If required by the Board of Directors, he shall give the
corporation a bond for the faithful discharge of his duties in such amount and
with such surety as the board shall prescribe.

     SECTION 7.  SECRETARY. - The Secretary shall give, or cause to be given,
notice of all meetings of stockholders and directors, and all other notices
required by the law or by these By-Laws, and in case of his absence or refusal
or neglect so to do, any such notice may be given by any person thereunto
directed by the President, or by the directors, or stockholders, upon whose
requisition the meeting is called as provided in these By-Laws. He shall record
all the proceedings of the meetings of the corporation and of the directors in a
book to be kept for that purpose, and shall perform such other duties as may be
assigned to him by the directors or the President. He shall have the custody of
the seal of the corporation and shall affix the same to all instruments
requiring it, when authorized by the directors or the President, and attest the
same.

     SECTION 8.  ASSISTANT TREASURERS AND ASSISTANT SECRETARIES. - Assistant
Treasurers and Assistant Secretaries, if any, shall be elected and shall have
such powers and shall perform such duties as shall be assigned to them,
respectively, by the directors.


                                   ARTICLE V
                                 MISCELLANEOUS

     SECTION 1.  CERTIFICATES OF STOCK. - A certificate of stock, signed by the
Chairman or Vice-Chairman of the Board of Directors, if they be elected,
President or Vice-President, and the Treasurer or an Assistant Treasurer, or
Secretary or Assistant Secretary, shall be issued to each stockholder certifying
the number of shares owned by him in the corporation. When such certificates are
countersigned (1) by a transfer agent other than the corporation or its
employee, or, (2) by a registrar other than the corporation or its employee, the
signatures of such officers may be facsimiles.
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          SECTION 2. LOST CERTIFICATES. -- A new certificate of stock may be
issued in the place of any certificate theretofore issued by the corporation,
alleged to have been lost or destroyed, and the directors may, in their
discretion, require the owner of the lost or destroyed certificate, or his legal
representatives, to give the corporation a bond, in such sum as they may direct,
not exceeding double the value of the stock, to indemnify the corporation
against any claim that may be made against it on account of the alleged loss of
any such certificate, or the issuance of any such new certificate.

          SECTION 3. TRANSFER OF SHARES. -- The shares of stock of the
corporation shall be transferrable only upon its books by the holders thereof in
person or by their duly authorized attorneys or legal representatives, and upon
such transfer the old certificate shall be surrendered to the corporation by the
delivery thereof to the person in charge of the stock and transfer books and
ledgers, or to such other person as the directors may designate, by whom they
shall be cancelled, and new certificates shall thereupon be issued. A record
shall be made of each transfer and whenever a transfer shall be made for
collateral security, and not absolutely, it shall be so expressed in the entry
of the transfer.

          SECTION 4. STOCKHOLDERS RECORD DATE. -- (a) In order that the
corporation may determine the stockholders entitled to notice of or to vote at
any meeting of stockholders or any adjournment thereof, the board of directors
may fix a record date, which record date shall not precede the date upon which
the resolution fixing the record date is adopted by the board of directors. A
determination of stockholders of record entitled to notice of or to vote at a
meeting of stockholders shall apply to any adjournment of the meeting; provided,
however, that the board of directors may fix a new record date for the adjourned
meeting.

          (b) In order that the corporation may determine the stockholders
entitled to consent to corporate action in writing without a meeting, the board
of directors may fix a record date, which record date shall not precede the date
upon which the resolution fixing the record is adopted by the board of
directors.

          (c) In order that the corporation may determine the stockholders
entitled to receive payment of any dividend or other distribution or allotment
of any rights or the stockholders entitled to exercise any rights in respect of
any change, conversion or exchange of stock, or for the purpose of any other
lawful action, the board of directors may fix a record date, which record date
shall not precede the date upon which the resolution fixing the record date is
adopted.

          SECTION 5. DIVIDENDS. -- Subject to the provisions of the Certificate
of Incorporation, the Board of Directors may, out of funds legally available
therefor at any regular or special meeting, declare dividends upon the capital
stock of the corporation as and when they deem expedient. Before declaring any
dividend there may be set apart out of any funds of the corporation available
for dividends, such sum or sums as the directors from time to time in their
discretion deem proper for working capital or as a reserve fund to meet
contingencies or for equalizing dividends or for such other purposes as the
directors shall deem conducive to the interests of the corporation.
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          SECTION 6.  SEAL. -- The corporate seal shall be circular in form and
shall contain the name of the corporation, the year of its creation and the
words "Corporate Seal, Delaware, 1999". Said seal may be used by causing it or
a facsimile thereof to be impressed or affixed or reproduced or otherwise.

          SECTION 7.  FISCAL YEAR. -- The fiscal year of the corporation shall
be determined by resolution of the Board of Directors.

          SECTION 8.  CHECKS. -- All checks, drafts or other orders for the
payment of money, notes or other evidences of indebtedness issued in the name of
the corporation shall be signed by such officer or officers, agent or agents of
the corporation, and in such manner as shall be determined from time to time by
resolution of the Board of Directors.

          SECTION 9.  NOTICE AND WAIVER OF NOTICE. -- Whenever any notice is
required by these By-Laws to be given, personal notice is not meant unless
expressly so stated, and any notice so required shall be deemed to be
sufficient if given by depositing the same in the United States mail, postage,
prepaid, addressed to the person entitled thereto at his address as it appears
on the records of the corporation, and such notice shall be deemed to have been
given on the day of such mailing. Stockholders not entitled to vote shall not
be entitled to receive notice of any meetings except as otherwise provided by
Statute.

          Whenever any notice whatever is required to be given under the
provisions of any law, or under the provisions of the Certificate of
Incorporation of the corporation of these By-Laws, a waiver thereof in writing,
signed by the person or persons entitled to said notice, whether before or
after the time stated therein, shall be deemed equivalent thereto.

                                   ARTICLE VI
                                   AMENDMENTS

          These By-Laws may be altered or repealed and By-Laws may be made at
any annual meeting of the stockholders or at any special meeting thereof if
notice of the proposed alteration or repeal of By-Law or By-Laws to be made be
contained in the notice of such special meeting, by the affirmative vote of a
majority of the stock issued and outstanding and entitled to vote thereat, or
by the affirmative vote of a majority of the Board of Directors, at any regular
meeting of the Board of Directors, or at any special meeting of the Board of
Directors, if notice of the proposed alteration or repeal of By-Law or By-Laws
to be made, be contained in the notice of such special meeting.

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                                  ARTICLE VII
                                INDEMNIFICATION

     No director shall be liable to the corporation or any of its stockholders
for monetary damages for breach of fiduciary duty as a director, except with
respect to (1) a breach of the director's duty of loyalty to the corporation or
its stockholders, (2) acts or omissions not in good faith or which involve
intentional misconduct or a knowing violation of law, (3) liability which may
be specifically defined by law or (4) a transaction from which the director
derived an improper personal benefit, it being the intention of the foregoing
provision to eliminate the liability of the corporation's directors to the
corporation or its stockholders to the fullest extent permitted by law. The
corporation shall indemnify to the fullest extent permitted by law each person
that such law grants the corporation the power to indemnify.