Document:

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                                                                   Exhibit 10.13

                            NON-COMPETITION AGREEMENT

NON-COMPETITION AGREEMENT, dated as of March 10, 1998, among ORION POWER
HOLDINGS, INC., a Delaware corporation (the "Company"), Baltimore Gas and
Electric Company, a Maryland corporation ("BGE"), and CONSTELLATION POWER, INC.,
a Maryland corporation ("CPI").

                                   WITNESSETH

       WHEREAS, GS CAPITAL PARTNERS II, L.P., a Delaware limited partnership
("GSCP"), and CONSTELLATION POWER SOURCE, INC., a Delaware corporation
("Constellation"), on March 10, 1998, caused the formation of the Company and
entered into a Stockholders' Agreement relating thereto;

       WHEREAS, the Company has been formed for the purpose of investing in and
managing the operations of electric generating assets in the United States and
Canada (the "Portfolio Assets");

       WHEREAS, Constellation and the Company have entered into a Strategic
Alliance Agreement, dated the date hereof (the "CPS Strategic Alliance
Agreement"), whereby Constellation will be the exclusive provider of power
marketing and risk management services for the Portfolio Assets subject to the
terms of the CPS Strategic Alliance Agreement;

       WHEREAS, Constellation Operating Services, Inc. ("COSI") and the Company
have entered into a Strategic Alliance Agreement, dated the date hereof (the
"COSI Strategic Alliance Agreement"), whereby COSI will be the exclusive
provider of operations and maintenance services for the Portfolio Assets and
their associated transmission and fuel supply infrastructure subject to the
terms of the COSI Strategic Alliance Agreement;

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       WHEREAS, the parties hereto intend to establish terms pursuant to which
CPI, BGE and any affiliate of BGE (collectively, the "CPI Group") may engage in
the acquisition of Facilities.

       NOW, THEREFORE, in consideration of the promises and of the mutual
commitments and obligations hereinafter set forth, the parties hereto hereby
agree as follows:

       SECTION 1. Definitions. As used herein, the following terms shall have
the following meanings:

       "Auction" means the attempted sale of a Facility pursuant to which the
owner of the Facility has stated or announced that it intends to have or is
having discussions, for the purpose of soliciting bids, with respect to such
sale of the Facility, or interests therein, with more than one potential buyer.

       "Facility" means an electric generating facility in the United States or
Canada that, at the time of any purchase or attempted purchase, is either fully
constructed or has, or has previously had, commercial operations.

       "IPO" means an underwritten offering or series of underwritten offerings
pursuant to which the common stock, par value $.01 per share ("Common Stock") of
the Company, becomes registered under Section 12 of the Securities Exchange Act
of 1934, as amended (the "Exchange Act") (a) in which either (i) the Common
Stock issued in such IPO constitutes at least 20% of the Common Stock or (ii)
the gross proceeds to the Company and any selling stockholders, in the
aggregate, is at least $75 million before deducting underwriting discounts,
commissions and offering expenses and (b) which results in the Common Stock
being held by at least 500 holders of record within the meaning of Rule 12g5-1
under the Exchange Act.

       "Negotiated Transaction" shall have the meaning set forth in Section 4.

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       SECTION 2. Term. The term of this Agreement shall be five years unless
terminated by the CPI Group upon 30 days written notice within six months of the
occurrence of (i) a Termination Event, a Goldman Change of Control, a
Constellation Disposition or a Goldman Disposition, as such terms are defined in
the CPS Strategic Alliance Agreement, (ii) the termination of the CPS Strategic
Alliance Agreement or the COSI Strategic Alliance Agreement, or (iii) the
liquidation of the Company.

       SECTION 3. Auctions. With respect to a Facility which is the subject of
an Auction, the CPI Group shall be prohibited from bidding, and shall not bid,
or take any steps with the seller of the Facility or any other third party to
materially further the acquisition of such Facility, or any interest thereon
(other than actions contemplated by the CPS Strategic Alliance Agreement or the
COSI Strategic Alliance Agreement) ("Acquisition Actions"), unless the Company
provides the CPI Group with prior written notice that the CPI Group may take
Acquisition Actions with respect to such Facility (the "Granting Notice"). Any
Granting Notice shall be given by the Company in the sole discretion of the
Company and under no circumstance shall the Company be under an obligation to
provide a Granting Notice. If the Company provides to the CPI Group a Granting
Notice with respect to a Facility, the CPI Group may, subject to Section 5
hereof, take any and all Acquisition Actions with respect to such Facility. The
Company may, but shall be under no obligation to, proceed with Acquisition
Actions with respect to a Facility for which it did not provide a Granting
Notice.

       SECTION 4: Negotiated Transactions. If CPI wishes to take Acquisition
Actions with respect to a Facility (the "Subject Facility") which is not the
subject of an Auction (any transaction, or attempted transaction, to acquire any
such Facility, or an interest therein, is referred to as a "Negotiated
Transaction"):

                     (i)    the CPI Group shall provide, in good faith, taking
into account all relevant facts and circumstances, the Company with written
notice (a "Facility

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Notice") including (a) the identity of the Subject Facility, (b) a statement
that the CPI Group, subject to this Section 4, intends to take Acquisition
Actions to purchase such Subject Facility, or an interest therein, and (c) a
statement that the CPI Group believes it has a reasonable probability of
acquiring such Subject Facility, or an interest therein, in such Negotiated
Transaction. The Company shall provide a written response (a "Response") to any
and all Facility Notices, which Response shall indicate whether or not the
Company intends to take Acquisition Actions with respect to the purchase of the
Subject Facility, or an interest therein (a Response stating that the Company
does not have such intention is referred to as a "No Intention Response"). Such
Response shall be given in good faith, taking into account all relevant facts
and circumstances, within sufficient time (a "Response Period") to allow the CPI
Group, if a No Intention Response is given, to pursue, on a commercially
reasonable basis, the purchase of such Subject Facility, or an interest therein,
in the Negotiated Transaction. Prior to the receipt of a Response to a Facility
Notice, the CPI Group shall take no Acquisition Actions with respect to the
Subject Facility.

                     (ii)   In the event the Company indicates in a Response
that it intends to take Acquisition Actions with respect to the purchase of the
Subject Facility, or an interest therein, through a Negotiated Transaction (a
"Positive Response"), the CPI Group shall be precluded from taking any
Acquisition Actions with respect to the Subject Facility; provided, however,
that in the event that the Company, after initially giving a Positive Response
with respect to the purchase of such Subject Facility, or an interest therein,
subsequently decides not to pursue such purchase, the Company shall promptly
provide a No Intention Response to the CPI Group with respect to such Subject
Facility. If the Company gives a No Intention Response, the CPI Group shall
have, subject to Section 5 below, the right to take Acquisition Actions with
respect to the purchase of the Subject Facility, or an interest therein.

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                     (iii)  In the event that, during negotiations with respect
to a Negotiated Transaction, the seller of the Subject Facility commences an
Auction, the provisions of Section 3 shall apply to such Subject Facility, and
CPI shall immediately terminate any Acquisition Actions with respect to such
Subject Facility unless a Granting Notice is given with respect to such Subject
Facility.

       SECTION 5. The Company's Right to Share Interests in Facilities. In the
event that the CPI Group is not prohibited from proceeding with Acquisition
Actions with respect to any Facility pursuant to this Agreement and enters into
a letter of intent with respect to the purchase of such Facility or any interest
therein, immediately following the execution of such letter of intent, the CPI
Group shall, in writing, offer (the "Company Offer") the Company the right to
acquire such percentage designated by the Company up to a maximum 50% of the
interest to be acquired by the CPI Group in such Facility (absent an investment
by the Company pursuant to this Section 5) upon the same terms and conditions
(including any rights for breaches of representations, warranties and covenants
or for indemnification against the seller of the Facility) and at the same time
as the CPI Group would acquire its interest in such Facility pursuant to such
transaction, with the CPI Group and the Company each bearing a proportionate
share of the out-of-pocket transaction costs borne by the CPI Group and the
Company in connection with such acquisition (but not including any costs borne
by the Facility or the entity that will own the Facility after the acquisition).
Such acquisition by the Company pursuant to a Company Offer shall be structured
either as a purchase from the seller simultaneous with the CPI Group's purchase
from the seller, or a simultaneous purchase by the CPI Group and sale to the
Company, of the appropriate portion of the interest purchased by the CPI Group
from the seller of the Facility (any such sale of an interest to the Company
pursuant to this Section 5 is referred to as an "Interest Sale"). The Company
shall accept or reject such Company Offer within ten business days of receipt of
the Company Offer.

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Notwithstanding the foregoing, if the seller of the Facility precludes the CPI
Group from consummating an Interest Sale, the CPI Group may complete the
transaction without making a Company Offer; provided, that the CPI Group shall
use its reasonable efforts thereafter to consummate an Interest Sale pursuant to
this Section 5 as soon as practicable thereafter.

       SECTION 6. Mutual Right of First Offer. If the Company and the CPI Group
(each a "Stakeholder") each hold an interest (an "Interest") in a Facility
acquired in accordance with Section 5 and either party wishes to sell its
interest in such Facility, and such sale is not combined with the sale of any
other Interest in any other Facility (other than another Facility in which each
Stakeholder owns an interest acquired in accordance with Section 5), then the
party wishing to sell (the "Selling Stakeholder") shall seek to sell such
Interest in accordance with the following procedures:

                            (A)    The Selling Stakeholder, together with its
              Affiliates, shall first deliver to the non-selling Stakeholder
              (the "Non-Selling Stakeholder") a written notice (a "Section 6
              Offer Notice"), which shall (i) state the Selling Stakeholder's
              intention to sell its Interest, the percentage and type of
              Interest intended to be Sold (the "Subject Interest"), the
              proposed purchase price therefor and a summary of the other
              material terms of the proposed sale and (ii) offer the Non-Selling
              Stakeholder the option to acquire all or a portion of such Subject
              Interest upon the terms and subject to the conditions of the
              proposed sale as set forth in the Section 6 Offer Notice (the
              "Section 6 Offer"); provided that such Section 6 Offer may provide
              that it must be accepted by the Non-Selling Stakeholder on an all
              or nothing basis (an "All or Nothing Sale"). The Section 6 Offer
              shall

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              remain open and irrevocable for the periods set forth below (and,
              to the extent the Section 6 Offer is accepted during such periods,
              until the consummation of the sale contemplated by the Section 6
              Offer). For a period of 20 days after delivery of the Section 6
              Offer Notice (the "Section 6(A) Acceptance Period"), the
              Non-Selling Stakeholder shall have the right to accept all or any
              part of the Subject Interest at the purchase price, in cash, and
              on the terms stated in the Section 6 Offer Notice; provided,
              however, that, if the Section 6 Offer contemplated an All or
              Nothing Sale, the Non-Selling Stakeholder may accept, during the
              Section 6(A) Acceptance Period, all, but not less than all of the
              Subject Interest, at the purchase price and on the terms stated in
              the Section 6 Offer Notice. If a Section 6 Offer is accepted, the
              Non-Selling Stakeholder shall be irrevocably obligated to
              consummate the purchase as set forth in Section 6(C) below. Such
              acceptance shall be made by delivering a written notice to the
              Selling Stakeholder within the Section 6(A) Acceptance Period.

                            (B)    If effective acceptance shall not be received
              pursuant to Section 6(A) above with respect to the entire Subject
              Interest offered for sale pursuant to the Section 6 Offer Notice,
              then the Selling Stakeholder may enter into a binding agreement to
              sell all or any portion of the Interest so offered for sale and
              not so accepted, at a price not less than the price, and on terms
              not more favorable to the purchaser thereof than the terms, stated
              in the Section 6 Offer Notice at any time within 120 days

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              after the expiration of the Section 6(A) Acceptance Period (the
              "Sale Period"); provided, however, that if the Section 6 Offer
              contemplated an All or Nothing Sale, the Selling Stakeholder may
              sell all, but not less than all, of the Interest so offered. To
              the extent the Selling Stakeholder sells all or a portion of the
              Interest so offered for sale during the Sale Period, the Selling
              Stakeholder shall promptly notify the Non-Selling Stakeholder as
              to (i) the Interest, if any, that the Selling Stakeholder then
              owns, (ii) the Interest percentage that the Selling Stakeholder
              has sold, (iii) the terms of such sale and (iv) the identity of
              the purchaser(s) of any Interest sold. In the event that the
              entire Interest is not sold by the Selling Stakeholder during the
              Sale Period, the right of the Selling Stakeholder to sell such
              Interest shall expire and the obligations of this Section 6 shall
              be reinstated; provided, however, that, in the event that the
              Selling Stakeholder determines, at any time during the Sale
              Period, that the sale of the entire Interest on the terms set
              forth in the Section 6 Offer Notice is impractical, the Selling
              Stakeholder may terminate the offer and reinstate the procedure
              provided in this Section 6 without waiting for the expiration of
              the Sale Period; and provided further, however, that the Selling
              Stakeholder shall not give a Section 6 Offer Notice with respect
              to a transaction relating to the Facility which is the subject of
              the Section 6 Offer Notice which would require compliance with
              this Section 6 for a period of at least 60 days from the last day
              of the Sale Period.

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                            (C)    All sales of Subject Interest to the
              Non-Selling Stakeholder shall be consummated at the offices of
              Fried, Frank, Harris, Shriver & Jacobson, One New York Plaza, New
              York, New York, or at such other place as the parties to such
              sales may agree, on the later of (i) a mutually satisfactory
              business day within 20 days after the expiration of the Section
              6(A) Acceptance Period or (ii) if applicable, the fifth business
              day following the expiration or termination of all waiting periods
              under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
              amended (the "HSR Act"), or the receipt of any other regulatory
              approvals applicable to such sales, or at such other time as the
              parties to such sales may agree. The delivery of certificates or
              other instruments evidencing such Subject Interest duly endorsed
              for transfer shall be made on such date against payment of the
              purchase price for such Subject Interest.

                            (D)    The provisions of this Section 6: (i) shall
              not apply to any sale of an Interest by a Stakeholder to an
              Affiliate of such Stakeholder and (ii) shall not permit the Sale
              of any Interest to an entity which, as a result of such entity
              holding an ownership interest in the Facility, would have a
              material adverse regulatory effect on the ability of the Facility
              or its affiliated entities (a) to sell power from generating
              assets owned by the Facility or its affiliated entities at
              market-based rates or (b) to acquire additional generating assets
              in the United States or Canada and to sell such power at
              market-based rates.

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       SECTION 7. Representations and Warranties. Each party represents and
warrants to the other parties that: (i) it is duly organized, validly existing
and in good standing under the laws of the jurisdiction of its formation, (ii)
it has all regulatory authorizations necessary for it to legally perform its
obligations under this Agreement and any other documentation relating to this
Agreement, (iii) the execution, delivery and performance of this Agreement and
any other documentation relating to this Agreement are within its powers, have
been duly authorized by all necessary action and do not violate any of the terms
and conditions in its governing documents, any material contracts to which it is
a party or any law, rule or regulation material to it or order or the like
applicable to it, (iv) this Agreement and each other document executed and
delivered in accordance with this Agreement constitutes its legally valid and
binding obligation enforceable against it in accordance with its terms, (v)
there are no bankruptcy proceedings pending or being contemplated by it or, to
its knowledge, threatened against it, and (vi) there is not pending or, to its
knowledge, threatened against it or any of its affiliates, any legal proceedings
that could materially adversely affect its ability to perform its obligations
under this Agreement or any other document relating to this Agreement to which
it is a party.

       SECTION 8. Assignment. No party shall assign this Agreement or its rights
or obligations hereunder to any party without the prior written consent of the
other party; provided, however, that any party hereto may assign its rights
under Sections 5 and 6 hereunder to any affiliate of such party.

       SECTION 9. Amendment and Waiver. No modification, amendment or waiver of
any provision of this Agreement shall be effective against any party unless such
modification, amendment or waiver is approved in writing by such party. The
failure of any party to enforce any of the provisions of this Agreement shall in
no way be construed as a waiver of such provisions and shall not affect the
right of such party thereafter to enforce each and every provision of this
Agreement in accordance with its terms.

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       SECTION 10. Severability. Whenever possible, each provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be invalid,
illegal or unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability shall not affect
any other provision or any other jurisdiction, but this Agreement shall be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

       SECTION 11. Entire Agreement. This Agreement and the other writings
referred to herein or delivered pursuant hereto which form a part hereof contain
the entire agreement and understanding among the parties hereto with respect to
the subject matter hereof and supersedes and preempts any prior understandings,
agreements or representations by or among the parties, written or oral, which
may have related to the subject matter hereof in any way.

       SECTION 12. Counterparts. This Agreement may be executed in separate
counterparts each of which shall be an original and all of which taken together
shall constitute one and the same agreement.

       SECTION 13. Notices. Any notice provided for in this Agreement shall be
in writing and shall be either personally delivered or sent by facsimile or
reputable overnight courier service (charges prepaid) to the Company, BGE and
CPI at the addresses set forth below, or at such address or to the attention of
such other person as the recipient party has specified by prior written notice
to the sending party. Notices will be deemed to have been given hereunder when
delivered personally or on receipt.

         The Company's address is:      c/o John Bu

                                        GS Capital Partners II, L.P.

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                                        85 Broad Street, 19th Floor

                                        New York, New York  10004

                                        Facsimile:  (212) 357-5505

                                        Attention:  Jack Fusco

                                        with a copy to:

                                        Fried, Frank, Harris, Shriver & Jacobson

         One New York Plaza

         New York, New York  10004

         Facsimile:  (212) 859-8000

         Attention:  Paul M. Reinstein, Esq.

         and a copy to:

         GS Capital Partners II, L.P.

         85 Broad Street

         New York, New York  10004

         Facsimile:  (212) 902-3000

         Attention:  David J. Greenwald, Esq.

         CPI's address is:              250 West Pratt Street, 23rd Floor

                                        Baltimore, Maryland  21201

                                        Facsimile:  (410) 783-3632

                                        Attention:  Secretary

         With a copy to:                Constellation Power Source, Inc.
                                        39 West Lexington Street

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                                        Baltimore, Maryland  21201

                                        Facsimile:  (410) 234-7866

                                        Attention:  David M. Perlman, Esq.

         BGE's address is:              39 West Lexington Street

                                        Baltimore, Maryland  21201

                                        Facsimile:  (410) 234-5643

                                        Attention:  David A. Brune

       SECTION 14. Governing Law and Jurisdiction. THIS AGREEMENT AND THE RIGHTS
AND DUTIES OF THE PARTIES HEREUNDER SHALL BE GOVERNED BY AND CONSTRUED, ENFORCED
AND PERFORMED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE, WITHOUT
REGARD TO PRINCIPLES OF CONFLICTS OF LAW.

       SECTION 15. Descriptive Headings. The descriptive headings of this
Agreement are inserted for convenience only and do not constitute a part of this
Agreement.

       SECTION 16. Construction. Where specific language is used to clarify by
example a general statement contained herein, such specific language shall not
be deemed to modify, limit or restrict in any manner the construction of the
general statement to which it relates. The language used in this Agreement shall
be deemed to be the language chosen by the parties hereto to express their
mutual intent, and no rule of strict construction shall be applied against any
party.

       SECTION 17. Remedies. The sole remedy conferred upon the Company with
respect to a material breach of Sections 3, 4, 5 or 6 of this Agreement (a
"Material Breach") by BGE or CPI (or any affiliate of BGE or CPI) shall be the
right to terminate (i) the CPS Strategic Alliance Agreement (and the underlying
Power Sales and Brokerage Agreements entered into thereunder) pursuant to
Section 5(c)(i)(D) thereof and (ii) the COSI Strategic Alliance Agreement (and
the underlying Operating Agreements

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thereunder) pursuant to Section 5(c)(i)(D) thereof. With respect to any other
breach, the parties shall have such remedies as are available under law for
direct damages or under equity. In no case shall any party be liable to the
other for a breach of this Agreement for consequential, indirect, punitive or
special damages.

       SECTION 18. Excluded Assets. Notwithstanding the foregoing, the CPI Group
shall have the right to take Acquisition Actions, and the provisions of Sections
5 and 6 shall not apply to such Acquisition Actions, (i) with respect to the
Facilities being offered for sale by General Public Utilities as long as such
sale process is conducted by Goldman Sachs & Co. and such current sale process
is not cancelled, (ii) with respect to the two Facilities located in the Western
United States which are subject to confidentiality agreements ("Listed
Facilities"), for a period of 12 months from the date of this Agreement (the
"Permitted Period"), (iii) after the Permitted Period, with respect to the
closing of a binding agreement which is executed during the Permitted Period,
for the purchase of any Listed Facility, and (iv) with respect to an interest in
an existing Facility owned by the CPI Group as of the date of this Agreement.
The parties hereto recognize that in the event the CPI Group divests any of its
existing BGE utility generating plants and replaces such generating plants with
other Facilities without complying with Sections 3, 4, 5, or 6, the termination
provision of Section 17 hereto shall apply.

       SECTION 19. Confidentiality. Except as required by law or regulation, or
unless publicly disclosed prior thereto, no party to this Agreement or their
affiliates shall disclose the terms of this Agreement to any person other than
their respective representatives and agents; provided, however, the Company may
disclose the terms of this Agreement to any third party, or its representatives
or agents, who may be interested in investing in, or providing financing to, the
Company.

       SECTION 20. Dispute Resolution. (a) The resolution of any controversy,
claim or dispute (a "Material Breach Dispute") as to whether a Material Breach
has occurred

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shall be determined in the following manner: (a) the Chief Executive Officer of
each of the Company and any member of the CPI Group shall meet in a good faith
effort to reasonably resolve any such Dispute, (b) if such Chief Executive
Officers are unable to resolve the Dispute within 15 days after notice of a
Material Breach (a "Material Breach Notice") is given pursuant to Section
5(c)(i) of the CPI Strategic Alliance Agreement or Section 5(c)(i) after COSI
Strategic Alliance Agreement, or upon the request of either Chief Executive
Officer, the Chairman of the Board of each of the Company and any member of the
CPI Group, or an equivalent director or officer, shall meet in a good faith
effort to reasonably resolve any such Dispute, and (c) if the Chairman of the
Board of each of the Company and any member of the CPI Group are unable to reach
a resolution within 30 days after a Material Breach Notice is given, upon the
request of either Chairman of the Board, the conflict shall be referred to and
then settled by binding arbitration in Delaware, administered by the American
Arbitration Association in accordance with the Expedited Procedures of its
Commercial Arbitration Rules, and judgment on the award rendered by the
arbitrator(s) may be entered in any court having jurisdiction. Following 30 days
after a Material Breach Notice is given, nothing in this Section 20(a) shall
require the Company to delay or forbear from exercising its rights under Section
17 hereof or Section 5(c)(i) of the CPS Strategic Alliance Agreement or Section
or 5(c)(i) of the COSI Strategic Alliance Agreement relating to a Material
Breach, during the pendency of any Material Breach Dispute resolution process.

       (b)    The resolution of any controversy, claim or dispute other than a
dispute as to whether a Material Breach has occurred (an "Other Dispute")
arising out of or relating to this Agreement (including, without limitation, any
questions of interpretation of this Agreement) shall be determined in the
following manner: (a) the parties shall immediately commence negotiations to
settle any Other Dispute, (b) if the parties are unable to resolve the Other
Dispute within 30 days from the date on which the parties

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initially commenced negotiations with respect to such Other Dispute, upon the
request (the "First Trigger") of either the Company or the CPI Group at any time
after such 30 day period, the Chief Executive Officer of each of the Company and
any member of the CPI Group shall meet in a good faith effort to reasonably
resolve any such Other Dispute, (c) if such Chief Executive Officers are unable
to resolve the Other Dispute within 15 days of the First Trigger (the "CEO
Period"), or upon the request (such request or the expiration of the CEO Period
is referred to as the "Second Trigger") of either Chief Executive Officer, the
Chairman of the Board of each of the Company and any member of the CPI Group, or
an equivalent director or officer, shall meet in a good faith effort to
reasonably resolve any such Other Dispute, and (d) if the Chairman of the Board
of each of the Company and any member of the CPI Group are unable to reach a
resolution within 15 days of the Second Trigger, or upon the request of either
Chairman of the Board, the conflict shall be referred to and then settled by
binding arbitration in Delaware, administered by the American Arbitration
Association in accordance with the Expedited Procedures of its Commercial
Arbitration Rules, and judgment on the award rendered by the arbitrator(s) may
be entered in any court having jurisdiction.

                           [INTENTIONALLY LEFT BLANK]

       IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first above written.

                                   ORION POWER HOLDINGS, INC.

                                   By:
                                      --------------------------------------
                                      Name:  Jack Fusco
                                      Title: Chief Operating Officer

                                   BALTIMORE GAS AND ELECTRIC COMPANY

                                   By:
                                      --------------------------------------

<PAGE>   17

                                      Name:  C. H. Poindexter
                                      Title: Chairman of the Board

                                   CONSTELLATION POWER, INC.

                                   By:
                                      --------------------------------------
                                      Name:  J. F. Walter
                                      Title: President<PAGE>   1
                                                                   EXHIBIT 10.14

                            NON-COMPETITION AGREEMENT

         NON-COMPETITION AGREEMENT, dated as of November 5, 1999, between ORION
POWER HOLDINGS, INC., a Delaware corporation (the "Company") and MITSUBISHI
CORPORATION, a Japan corporation ("Mitsubishi").

                                   WITNESSETH

         WHEREAS, GS CAPITAL PARTNERS II, L.P., a Delaware limited partnership
("GSCP"), and CONSTELLATION POWER SOURCE, INC., a Delaware corporation
("Constellation"), as of March 10, 1998, caused the formation of the Company and
entered into a Stockholders' Agreement relating thereto (the "Original
Stockholders' Agreement");

         WHEREAS, the Company has been formed for the purpose of investing in
and managing the operations of electric generating assets in the United States
and Canada (the "Portfolio Assets");

         WHEREAS, as of June 25, 1999, the Company, GSCP and Constellation
amended and restated the Original Stockholders' Agreement in its entirety (the
"First Amended and Restated Stockholders' Agreement");

         WHEREAS, as of September 29, 1999, and October 4, 1999 Mitsubishi and
Tokyo Electric Power Company International B.V. ("TEPCO International"),
respectively entered into Subscription Agreements pursuant to which the Company
committed to issue, and Mitsubishi and TEPCO International committed to
purchase, 77,419.355 and 51,612.903 shares, respectively, of Common Stock at the
price of $1,550.00 per share, for an aggregate purchase price of $120,000,000.00
and $80,000,000.00, respectively;

         WHEREAS, as of the date hereof, the Company, GSCP, Constellation,
Mitsubishi, TEPCO International and the other parties named therein amended and
restated the First Amended and Restated Stockholders' Agreement in its entirety
(the "Second Amended and Restated Stockholders' Agreement"); and

         WHEREAS, the parties hereto intend to establish terms pursuant to which
Mitsubishi and any Affiliate of Mitsubishi (collectively, the "Mitsubishi
Group") may engage in the acquisition of Facilities.

         NOW, THEREFORE, in consideration of the promises and of the mutual
commitments and obligations hereinafter set forth, the parties hereto hereby
agree as
<PAGE>   2
follows:

         SECTION 1. Definitions. As used herein, the following terms shall have
the following meanings:

         "Auction" means the attempted sale of a Facility or Facilities pursuant
to which the owner of the Facility or Facilities has stated or announced that it
intends to have or is having discussions, for the purpose of soliciting a bid or
bids, with respect to such sale of the Facility or Facilities, or interests
therein with more than one potential buyer.

         "Affiliate" shall mean, with respect to any Person, any other Person
directly or indirectly controlling or controlled by or under direct or indirect
common control with such specified Person.

         "Facility" means an electric generating facility in the United States
or Canada that, at the time of any purchase or attempted purchase, is either
fully constructed or has, or has previously had, commercial operations.

         "Greenfield Project" means a project to construct a new electric
generating facility in the United States or Canada when the interest to be
acquired is acquired prior to one hundred thirty five (135) days after the date
of commercial operation.

         "IPO" means an underwritten offering or series of underwritten
offerings pursuant to which the common stock, par value $.01 per share ("Common
Stock") of the Company, becomes registered under Section 12 of the Securities
Exchange Act of 1934, as amended (the "Exchange Act") (a) in which either (i)
the Common Stock issued in such IPO constitutes at least 20% of the Common Stock
or (ii) the gross proceeds to the Company and any selling stockholders, in the
aggregate, is at least $75 million before deducting underwriting discounts,
commissions and offering expenses and (b) which results in the Common Stock
being held by at least 500 holders of record within the meaning of Rule 12g5-1
under the Exchange Act.

         "Negotiated Transaction" shall have the meaning set forth in Section 4.

         "Person" means any individual, corporation, limited liability company,
limited or general partnership, joint venture, association, joint-stock company,
trust, unincorporated organization, other entity or government or any agency or
political subdivisions thereof.

         SECTION 2. Term. The term of this Agreement shall be from the date
hereof until the earlier to occur of (i) the closing of an IPO, (ii) six months
after the date on which all Mitsubishi Group representatives or nominees have
ceased to hold any of the following positions of the Company: director,
observer, officer or employee, (iii) the liquidation of the Company, and (iv)
five years after the date hereof.

                                     - 2 -
<PAGE>   3
         SECTION 3. Auctions. With respect to a Facility which is the subject of
an Auction, the Mitsubishi Group shall be prohibited from bidding, and shall not
bid, or take any steps with the seller of the Facility or any other third party
to materially further the acquisition of such Facility, or any interest therein
("Acquisition Actions"), unless the Company provides the Mitsubishi Group with
prior written notice that the Mitsubishi Group may take Acquisition Actions with
respect to such Facility (the "Granting Notice"). Any Granting Notice shall be
given by the Company in the sole discretion of the Company and under no
circumstance shall the Company be under an obligation to provide a Granting
Notice. If the Company provides to the Mitsubishi Group a Granting Notice with
respect to a Facility, the Mitsubishi Group may take any and all Acquisition
Actions with respect to such Facility. The Company may, but shall be under no
obligation to, proceed with Acquisition Actions with respect to a Facility for
which it did not provide a Granting Notice.

         SECTION 4. Negotiated Transactions. If the Mitsubishi Group wishes to
take Acquisition Actions with respect to a Facility (the "Subject Facility")
which is not the subject of an Auction (any transaction, or attempted
transaction, to acquire any such Facility, or an interest therein, is referred
to as a "Negotiated Transaction"):

                           (i) the Mitsubishi Group shall provide, in good
faith, taking into account all relevant facts and circumstances, the Company
with written notice (a "Facility Notice") including (a) the identity of the
Subject Facility, (b) a statement that the Mitsubishi Group, subject to this
Section 4, intends to take Acquisition Actions to purchase such Subject
Facility, or an interest therein, and (c) a statement that the Mitsubishi Group
believes it has a reasonable probability of acquiring such Subject Facility, or
an interest therein, in such Negotiated Transaction. The Company shall provide a
written response (a "Response") to any and all Facility Notices, which Response
shall indicate whether or not the Company intends to take Acquisition Actions
with respect to the purchase of the Subject Facility, or an interest therein (a
Response stating that the Company does not have such intention is referred to as
a "No Intention Response"). Such Response shall be given in good faith, taking
into account all relevant facts and circumstances, within sufficient time (a
"Response Period") to allow the Mitsubishi Group, if a No Intention Response is
given, to pursue, on a commercially reasonable basis, the purchase of such
Subject Facility, or an interest therein, in the Negotiated Transaction. Prior
to the receipt of a Response to a Facility Notice, the Mitsubishi Group shall
take no Acquisition Actions with respect to the Subject Facility.

                           (ii) In the event the Company indicates in a Response
that it intends to take Acquisition Actions with respect to the purchase of the
Subject Facility, or an interest therein, through a Negotiated Transaction (a
"Positive Response"), the Mitsubishi Group shall be precluded from taking any
Acquisition Actions with respect to the Subject Facility; provided, however,
that in the event that the Company, after initially

                                     - 3 -
<PAGE>   4
giving a Positive Response with respect to the purchase of such Subject
Facility, or an interest therein, subsequently decides not to pursue such
purchase, the Company shall promptly provide a No Intention Response to the
Mitsubishi Group with respect to such Subject Facility. If the Company gives a
No Intention Response, the Mitsubishi Group shall have the right to take
Acquisition Actions with respect to the purchase of the Subject Facility, or an
interest therein.

                           (iii) In the event that, during negotiations with
respect to a Negotiated Transaction, the seller of the Subject Facility
commences an Auction, the provisions of Section 3 shall apply to such Subject
Facility, and the Mitsubishi Group shall immediately terminate any Acquisition
Actions with respect to such Subject Facility unless a Granting Notice is given
with respect to such Subject Facility.

         SECTION 5. Excluded Assets. Notwithstanding the foregoing, the
Mitsubishi Group shall have the right to take Acquisition Actions, with respect
to (i) any interest in an existing Facility owned by the Mitsubishi Group as of
the date of this Agreement, (ii) to a Greenfield Project and (iii) any interest
in a Facility in which Mitsubishi and a Person identified in a separate letter
between the Company and Mitsubishi dated the date hereof, have a joint
investment, whether before or after the date of this Agreement.

         SECTION 6. Representations and Warranties. Each party represents and
warrants to the other parties that: (i) it is duly organized, validly existing
and in good standing under the laws of the jurisdiction of its formation, (ii)
it has all regulatory authorizations necessary for it to legally perform its
obligations under this Agreement and any other documentation relating to this
Agreement, (iii) the execution, delivery and performance of this Agreement and
any other documentation relating to this Agreement are within its powers, have
been duly authorized by all necessary action and do not violate any of the terms
and conditions in its governing documents, any material contracts to which it is
a party or any law, rule or regulation material to it or order or the like
applicable to it, (iv) this Agreement and each other document executed and
delivered in accordance with this Agreement constitutes its legally valid and
binding obligation enforceable against it in accordance with its terms, (v)
there are no bankruptcy proceedings pending or being contemplated by it or, to
its knowledge, threatened against it, and (vi) there is not pending or, to its
knowledge, threatened against it or any of its affiliates, any legal proceedings
that could materially adversely affect its ability to perform its obligations
under this Agreement or any other document relating to this Agreement to which
it is a party.

         SECTION 7. Assignment. No party shall assign this Agreement or its
rights or obligations hereunder to any party without the prior written consent
of the other party.

                                     - 4 -
<PAGE>   5
         SECTION 8. Amendment and Waiver. No modification, amendment or waiver
of any provision of this Agreement shall be effective against any party unless
such modification, amendment or waiver is approved in writing by such party. The
failure of any party to enforce any of the provisions of this Agreement shall in
no way be construed as a waiver of such provisions and shall not affect the
right of such party thereafter to enforce each and every provision of this
Agreement in accordance with its terms.

         SECTION 9. Severability. Whenever possible, each provision of this
Agreement shall be interpreted in such manner as to be effective and valid under
applicable law, but if any provision of this Agreement is held to be invalid,
illegal or unenforceable in any respect under any applicable law or rule in any
jurisdiction, such invalidity, illegality or unenforceability shall not affect
any other provision or any other jurisdiction, but this Agreement shall be
reformed, construed and enforced in such jurisdiction as if such invalid,
illegal or unenforceable provision had never been contained herein.

         SECTION 10. Entire Agreement. This Agreement and the other writings
referred to herein or delivered pursuant hereto which form a part hereof contain
the entire agreement and understanding among the parties hereto with respect to
the subject matter hereof and supersedes and preempts any prior understandings,
agreements or representations by or among the parties, written or oral, which
may have related to the subject matter hereof in any way.

         SECTION 11. Counterparts. This Agreement may be executed in separate
counterparts each of which, when delivered to the other party, shall be an
original and all of which taken together shall constitute one and the same
agreement.

         SECTION 12. Notices. Any notice provided for in this Agreement shall be
in writing and shall be either personally delivered or sent by facsimile or
reputable overnight courier service (charges prepaid) to the Company and
Mitsubishi at the addresses set forth below, or at such address or to the
attention of such other person as the recipient party has specified by prior
written notice to the sending party. Notices will be deemed to have been given
hereunder when delivered personally or on receipt.

         The Company's address is:         Orion Power Holdings, Inc.
                                           7 East Redwood Street
                                           10th Floor
                                           Baltimore, Maryland  21202
                                           Facsimile:  (410) 234-0994
                                           Attention:  General Counsel

                                           with a copy to:

                                     - 5 -
<PAGE>   6
                                           Fried, Frank, Harris, Shriver &
                                             Jacobson
                                           One New York Plaza
                                           New York, New York  10004
                                           Facsimile: (212) 859-8000
                                           Attention: Paul M. Reinstein, Esq.

         Mitsubishi Group's address is:    Mitsubishi Corporation
                                           c/o Mitsubishi International
                                             Corporation
                                           520 Madison Ave.
                                           New York, New York
                                           Facsimile:  (212) 605-1771
                                           Attention:  Legal Department

         with a copy to:                   Mitsubishi Corporation
                                           6-3 Marunouchi 2-chome, Chiyoda-ku
                                           Tokyo 100-8086, Japan
                                           Facsimile:  81-3-3210-2469
                                           Attention:  Legal Department

         with a copy to:                   Morgan, Lewis & Bockius LLP
                                           300 S. Grand Avenue, 22nd Floor
                                           Los Angeles, California  90071
                                           Facsimile:  213-612-2554
                                           Attention:  Richard A. Shortz, Esq.

         SECTION 13. Governing Law; Submission to Jurisdiction; Waiver of Jury
Trial This Agreement shall be governed by and construed in accordance with the
laws of the State of New York without giving effect to the principles of
conflicts of law. Each of the parties hereto hereby irrevocably and
unconditionally consents to submit to the exclusive jurisdiction of the courts
of the State of New York and of the United States of America, in each case
located in the County of New York, for any action, proceeding or investigation
in any court or before any governmental authority ("Litigation") arising out of
or relating to this Agreement and the transactions contemplated hereby (and
agrees not to commence any Litigation relating thereto except in such courts),
and further agrees that service of any process, summons, notice or document by
U.S. registered mail to its respective address set forth in this Agreement shall
be effective service of process for any Litigation brought against it in any
such court. Each of the parties hereto hereby irrevocably and unconditionally
waives any objection to the laying of venue of any Litigation arising out of
this Agreement or the transactions contemplated hereby in the courts of the
State of New

                                     - 6 -
<PAGE>   7
York or the United States of America, in each case located in the County of New
York, and hereby further irrevocably and unconditionally waives and agrees not
to plead or claim in any such court that any such Litigation brought in any such
court has been brought in an inconvenient forum. Each of the parties irrevocably
and unconditionally waives, to the fullest extent permitted by applicable law,
any and all rights to trial by jury in connection with any Litigation arising
out of or relating to this Agreement or the transactions contemplated hereby.

         SECTION 14. Descriptive Headings. The descriptive headings of this
Agreement are inserted for convenience only and do not constitute a part of this
Agreement.

         SECTION 15. Construction. Where specific language is used to clarify by
example a general statement contained herein, such specific language shall not
be deemed to modify, limit or restrict in any manner the construction of the
general statement to which it relates. The language used in this Agreement shall
be deemed to be the language chosen by the parties hereto to express their
mutual intent, and no rule of strict construction shall be applied against any
party.

         SECTION 16. Remedies. Each party hereto shall be entitled to enforce
its rights under this Agreement specifically to recover damages by reason of any
breach of any provision of this Agreement and to exercise all other rights
existing in its favor. The parties hereto agree and acknowledge that money
damages may not be an adequate remedy for any breach of the provisions of this
Agreement and that each party may in its sole discretion apply to any court of
law or equity of competent jurisdiction for specific performance and/or
injunctive relief (without posting a bond or other security) in order to enforce
or prevent any violation of the provisions of this Agreement. In no case shall
any party be liable to the other for a breach of this Agreement for
consequential, indirect, punitive or special damages.

         SECTION 17. Confidentiality. The parties hereto shall keep the
existence and the terms of this Agreement strictly confidential unless (i) the
disclosing party has received the advice of independent counsel that such
disclosure is required by any law (including, without limitation, any judicial
order) or other requirement of any governmental entity to which the disclosing
party is subject (provided that prior to such disclosure, the disclosing party
promptly advises and consults with the non-disclosing parties concerning the
information it proposes to disclose), (ii) the disclosing party discloses such
information to a potential purchaser of Company equity held by the disclosing
party (provided that prior to such disclosure, the potential purchaser executes
a confidentiality agreement imposing confidentiality obligations on such
potential purchaser with respect to any non-competition agreement substantially
identical to the confidentiality obligations imposed by this Section 17) or
(iii) such information becomes publicly available (other than as a result of any
act or omission

                                     - 7 -
<PAGE>   8
by such disclosing party).

                           [INTENTIONALLY LEFT BLANK]

                                     - 8 -
<PAGE>   9
IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the
date first above written.

                                   ORION POWER HOLDINGS, INC.

                                   By:   ____________________________________
                                         Name:    Jack Fusco
                                         Title:   Chief Operating Officer

                                   MITSUBISHI CORPORATION

                                   By:   ____________________________________
                                         Name:
                                         Title:
<PAGE>   10
                             MITSUBISHI CORPORATION
                       6-3, Marunouchi 2-chome, Chiyoda-ku
                                 Tokyo 100-8086
                                      Japan

November ___, 1999

Orion Power Holdings, Inc.
7 East Redwood Street, 10th Floor
Baltimore, Maryland 21202

RE:      NON-COMPETITION AGREEMENT, BY AND BETWEEN MITSUBISHI CORPORATION AND
         ORION POWER HOLDINGS, INC., DATED AS OF EVEN DATE HEREWITH

Ladies and Gentlemen:

Reference is hereby made to that certain Non-Competition Agreement, by and
between Mitsubishi Corporation ("Mitsubishi") and Orion Power Holdings, Inc.
("Orion"), dated as of even date herewith (the "Non-Competition Agreement").
Capitalized terms used herein but not otherwise defined shall have the meaning
ascribed to them in the Non-Competition Agreement.

For purposes of Section 5(iii) of the Non-Competition Agreement, Mitsubishi and
Orion hereby agree that the Persons to be identified in accordance with the
terms thereof is hereby identified as Tenaska, Inc. and its affiliates.

Sincerely yours,

MITSUBISHI CORPORATION

By:
Name:
Its:

AGREED AND ACKNOWLEDGED:

ORION POWER HOLDINGS, INC.

By:
Name:
Its:

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