SCHEDULE 14A
                                 (RULE 14A-101)

                     INFORMATION REQUIRED IN PROXY STATEMENT

                            SCHEDULE 14A INFORMATION

           Proxy Statement Pursuant to Section 14(a) of the Securities
                              Exchange Act of 1934

Filed by the Registrant |X|
Filed by a Party other than the Registrant |_|
Check the appropriate box:

|_|  Preliminary Proxy Statement
|_|  Confidential, For Use of the Commission
     Only (as permitted by Rule 14a-6(e)(2))
|_|  Definitive Proxy Statement
|_|  Definitive Additional Materials
|X|  Soliciting Material Under Rule 14a-12

                           ORION POWER HOLDINGS, INC.
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                (Name of Registrant as Specified in Its Charter)

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    (Name of Person(s) Filing Proxy Statement, if Other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

     |X| No fee required.

     |_| Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and
     0-11.

     (1) Title of each class of securities to which transaction applies:

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     (2) Aggregate number of securities to which transaction applies:

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     (3) Per unit price or other underlying value of transaction computed
pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee
is calculated and state how it was determined):

     (4) Proposed maximum aggregate value of transaction:

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(5) Total fee paid:

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     |_| Fee paid previously with preliminary materials:

     Check box if any part of the fee is offset as provided by Exchange Act Rule
0-11(a)(2) and identify the filing for which the offsetting fee was paid
previously. Identify the previous filing by registration statement number, or
the form or schedule and the date of its filing.

     (1) Amount previously paid:

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     (2) Form, Schedule or Registration Statement No.:

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     (3) Filing Party:

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     (4) Date Filed:

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[RELIANT RESOURCES, INC. LOGO]                 [ORION POWER HOLDINGS, INC. LOGO]


                    RELIANT RESOURCES TO ACQUIRE ORION POWER
                           IN $2.9 BILLION TRANSACTION

     TRANSACTION ENHANCES RELIANT RESOURCES' POSITION AS LEADING PROVIDER OF
                      WHOLESALE POWER AND ENERGY SERVICES

HOUSTON AND BALTIMORE,  SEPTEMBER 27, 2001 - Reliant Resources, Inc. (NYSE: RRI)
and Orion Power Holdings, Inc. (NYSE: ORN) announced that they have entered into
a definitive merger agreement, under which Reliant Resources will acquire all of
the  outstanding  shares  of  Orion  Power  for  $26.80  per  share in cash in a
transaction  valued at approximately  $2.9 billion.  Reliant Resources will also
assume  approximately  $1.8 billion of Orion Power's net debt.  The  transaction
will be  immediately  accretive to Reliant  Resources'  earnings per share.  The
companies  anticipate that the  transaction  will be completed in early 2002, at
which time Orion  Power's  business  will be combined  with  Reliant  Resources'
domestic wholesale group.

The transaction will enhance Reliant  Resources'  position as a leading provider
of wholesale  power,  gas, and energy  services,  combining  Reliant  Resources'
14,100  megawatts (MW) of domestic  capacity in operation or under  construction
with Orion  Power's  6,500 MW. The combined  company will  capitalize  on strong
commercial skills, including trading,  marketing, risk management and integrated
asset operations.

This transaction is consistent with Reliant Resources' strategy to:

     o Focus on a diverse  portfolio of assets across  multiple  regions  within
       North America;
     o Target  regions  with   attractive   market   fundamentals   and  growth
       opportunities; and
     o Utilize  trading,  marketing,  risk  management  and operating  skills to
       enhance earnings.

Steve  Letbetter,  chairman,  president and chief  executive  officer of Reliant
Resources,   said,  "This  transaction   positions  the  company  for  continued
attractive growth in earnings. Orion Power's generation fleet utilizes a diverse
fuel mix,  provides  a wide  range of  dispatch  capabilities  and  expands  our
geographic  footprint  into  attractive  power  markets in New York and the ECAR
power pools, which complement our existing presence in the PJM market.  With our
combined asset base, Orion Power's power sales contracts and Reliant  Resources'
commercial  skills and synergies,  we can create greater value from our combined
business at lower risk.  The  transaction is also  consistent  with our focus on
North America,  which we believe  continues to offer the most attractive  growth
opportunities in the gas and power markets."

                                     -more-


                                       -2-

Jack Fusco,  president and chief executive  officer of Orion Power,  said, "This
transaction  is  beneficial  to  both  companies'  shareholders  as  well as our
employees and the communities we serve. We are very pleased to be combining with
an  organization  with the  skills and  reputation  of  Reliant  Resources.  The
combined  company  will  be  even  better   positioned  to  capture  the  growth
opportunities  created by  deregulation.  We are firmly  committed to helping to
achieve a rapid and  seamless  integration  of our two  companies to ensure that
Reliant Resources continues to play a leading role in the energy industry."

The acquisition is structured as a cash merger and is conditioned  upon approval
by Orion Power's  shareholders and regulatory  approvals.  Shareholders owning a
majority of Orion Power's outstanding stock,  including Goldman, Sachs & Co. and
its affiliates,  Constellation  Energy Group, Inc.,  Mitsubishi  Corporation and
Tokyo Electric Power Company International,  have agreed to vote their shares in
favor of the  transaction.  The transaction is not  conditioned  upon financing.
Funding for the  transaction  will be obtained  through  current cash  balances,
existing  Reliant  Resources credit  facilities and a new acquisition  financing
facility, which will be in place prior to closing.

As previously  announced,  Reliant  Resources' Board of Directors has authorized
the company to repurchase  up to 10 million  shares of its common stock over the
next 18 months.

Merrill Lynch & Co. acted as financial advisor, and Baker Botts, L.L.P. acted as
legal  counsel to Reliant  Resources.  Goldman,  Sachs & Co.  acted as financial
advisor,  and Wachtell,  Lipton,  Rosen & Katz and Stroock & Stroock & Lavan LLP
acted as legal counsel to Orion Power.

Orion Power (NYSE:  ORN),  headquartered  in  Baltimore,  MD, is a  fast-growing
independent  electric power generating  company formed in March 1998 to acquire,
develop,  own and operate  power-generating  facilities in the newly deregulated
wholesale markets throughout North America. Since its inception, Orion Power has
invested over $4 billion in 81 power plants  currently in operation with a total
capacity of 5,926  megawatts and an additional  5,000  megawatts in construction
and various stages of development. For more information about Orion Power, visit
its website at www.orionpower.com.

Reliant  Resources,  based in Houston,  Texas,  provides  electricity and energy
services to wholesale and retail  customers in the U.S. and Europe.  The company
has nearly 20,000  megawatts of power  generation  capacity in operation,  under
construction  or under contract in the U.S. and is one of only five companies to
rank among both the ten largest power  marketers and the ten largest natural gas
marketers in North America.  Reliant  Resources  also has wholesale  trading and
marketing operations and nearly 3,500 megawatts of power generation in operation
in Western  Europe.  At the retail  level,  Reliant  Resources  provides  energy
services and will serve  approximately  1.7 million  customers in Texas when the
electricity  market opens to full retail  competition  in January 2002.  Reliant
Resources   currently  is  a  majority  owned   subsidiary  of  Reliant  Energy,
Incorporated (NYSE: REI).

                                     -more-


                                       -3-

This  press  release  includes  "forward-looking  statements"  as defined by the
Securities and Exchange  Commission.  Such  statements are those  concerning the
contemplated  transaction and strategic  plans,  expectations and objectives for
future  operations.  All statements,  other than statements of historical facts,
included in this press release that address  activities,  events or developments
that the companies expect, believe or anticipate will or may occur in the future
are  forward-looking  statements.  This  includes  completion  of  the  proposed
transaction,  realization of expected synergies from the transaction,  financing
for the transaction,  future commodity prices, future financial performance, and
other matters.  These  statements are based on certain  assumptions  made by the
companies based on their experience and perception of historical trends, current
conditions,  expected  future  developments  and other  factors they believe are
appropriate  in the  circumstances.  Such  statements are subject to a number of
assumptions,  risks and  uncertainties,  many of which are beyond the control of
the companies.  These risks include,  but are not limited to, market conditions,
economic conditions,  environmental risks and regulatory changes.  Investors are
cautioned that any such statements are not guarantees of future  performance and
that actual results or developments  may differ  materially from those projected
in the forward-looking statements.

In connection with the proposed merger,  Orion Power Holdings,  Inc. will file a
proxy  statement  with the SEC.  INVESTORS  AND  SECURITY  HOLDERS  ARE URGED TO
CAREFULLY READ THE PROXY STATEMENT  REGARDING THE PROPOSED  TRANSACTION  WHEN IT
BECOMES AVAILABLE, BECAUSE IT WILL CONTAIN IMPORTANT INFORMATION.  Investors and
security  holders  may  obtain a free  copy of the proxy  statement  (when it is
available) and other documents  containing  information about Reliant Resources,
Inc. and Orion Power Holdings,  Inc.,  without charge,  at the SEC's web site at
www.sec.gov.  Copies of the proxy  statement  and the SEC  filings  that will be
incorporated  by reference in the proxy  statement may also be obtained for free
by directing a request to: Investor  Relations,  Orion Power  Holdings,  Inc., 7
East Redwood Street,  Baltimore,  MD 21202;  Phone:  (410) 230-3528;  Fax: (410)
234-0994.

Orion Power and its directors,  executive  officers and certain of its employees
may be considered "participants" in the solicitation of proxies from Orion Power
stockholders  in connection  with the  transaction.  Information  regarding such
persons and a description of their interests in the transaction are contained in
Orion Power's Proxy  Statements  and Annual  Reports on Form 10-K filed with the
SEC.  Additional  information  regarding  the  interests of those persons may be
obtained  by reading the proxy  statement  for the  transaction  when it becomes
available.

FINANCIAL ANALYST TELECONFERENCE

The  senior  management  of  Reliant  Resources  will host a  financial  analyst
teleconference  call today at 10:00 am EDT to discuss this  transaction.  A live
broadcast of the  teleconference  is available  at  www.reliantresources.com  by
clicking on an available  link in the Investing  Section.  Real  Network's  Real
Player or Window's Media Player is required to access the web cast. Please go to
the web site at least 15 minutes  early to register,  download,  and install any
necessary software.  For those who cannot listen to the live broadcast, a replay
will be available on www.reliantresources.com shortly after the call.

                                     -more-


                                       -4-

FINANCIAL ANALYST MEETING

The senior  management of Reliant  Resources will also host a financial  analyst
meeting in New York City tomorrow at 9:00 am EDT to discuss this transaction.  A
live  broadcast  of the  meeting is  available  at  www.reliantresources.com  by
clicking on an available  link.  Real  Network's  Real Player or Window's  Media
Player is required to access the web cast. Please go to the web site at least 15
minutes early to register,  download,  and install any necessary  software.  For
those who cannot  listen to the live  broadcast,  a replay will be  available on
www.reliantresources.com shortly after the meeting.

CONTACTS FOR RELIANT RESOURCES           CONTACTS FOR ORION POWER HOLDINGS

INVESTORS:                               INVESTORS AND MEDIA:
Dennis Barber                            Rahul Advani
(713) 207-3042                           (410) 230-3528

MEDIA:
Sandy Fruhman
(713) 207-3123


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