Pursuant to Rule 425
                              Under the Securities Act of 1933
                              Subject Company: EXELON CORPORATION
                              Commission File No.: 333-37082

         Set forth below is the text of a postcard which was sent
to certain Unicom shareholders informing them of the dates and
locations of discussion meetings regarding the proposed merger
transaction of Unicom Corporation and PECO Energy Company to form
Exelon Corporation.

          The following communications contain certain
"forward-looking statements" within the meaning of the Private
Securities Litigation Reform Act of 1995.  These statements are
based on management's current expectations and are naturally
subject to uncertainty and changes in circumstances.  Actual
results may vary materially from the expectations contained
herein.  The forward-looking statements herein include statements
about future financial and operating results and the proposed
merger involving PECO Energy Company and Unicom Corporation.  The
following factors, among others, could cause actual results to
differ materially from those described herein:  inability to
obtain, or meet conditions imposed for, governmental approvals
for the merger; failure of the PECO Energy Company or Unicom
Corporation stockholders to approve the merger; the risk that the
PECO Energy Company and Unicom Corporation businesses will not be
integrated successfully; and other economic, business,
competitive and/or regulatory factors affecting PECO Energy
Company's and Unicom's businesses generally.  More detailed
information about those factors is set forth in the joint proxy
statement/prospectus regarding the proposed merger.  Neither PECO
Energy Company nor Unicom Corporation is under any obligation to
(and expressly disclaims any such obligation to) update or alter
its forward-looking statements whether as a result of new
information, future events or otherwise.

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

          Investors and security holders are urged to read the
joint proxy statement/prospectus regarding the business
combination transaction referenced in the foregoing information
because it contains important information.  The joint proxy
statement/prospectus has been filed with the Securities and
Exchange Commission by Exelon Corporation.  The joint proxy
statement/prospectus was declared effective by the Commission on
May 15, 2000.  Investors and security holders may obtain a free
copy of the joint proxy statement/prospectus and other documents
filed by PECO Energy Company and Unicom Corporation with the
Commission at the Commission's web site at  The
joint proxy statement/prospectus and these other documents may
also be obtained for free from PECO Energy Company or from Unicom

Side 1

                                     [Postage Indicia of Mailing]

Dear Unicom Shareholder:

Please join us for an import discussion of the proposed merger
between Unicom Corporation and PECO Energy Company.

If you have not already received your proxy materials, you will
be receiving them shortly.  Please carefully read the prospectus
as it contains important information about the merger.

Take advantage of this unique opportunity to hear first hand how
this merger and the creation of the new corporation, Exelon, will
affect your investment.

Choose from:

TUESDAY, JUNE 6, 6:30 - 7:30 P.M.
The Renaissance Hotel
2100 Spring Road, Oak Brook, Illinois

WEDNESDAY, JUNE 7, 8:30 - 9:30 A.M.
One BankOne Plaza, (BankOne Auditorium, lower level)
10 South Dearborn Street, Chicago, Illinois (enter from Dearborn

THURSDAY, JUNE 8, 6:30 - 7:30 P.M.
1750 Lake Cook Road, Deerfield, Illinois

Space is limited!  Call Now!
Reserve your space at this important meeting!

   [Graphic: pictures of electric utility facilities and equipment]

Side 2

   [Graphic: pictures of electric utility facilities and equipment]

      Don't miss this important opportunity to discuss the
                    Unicom/PECO Energy Merger

Discuss what the merger will mean to you and your investment

Learn more about the new corporation, Exelon

Meet with Unicom executives to discuss the merger

Please plan to attend one of these three important meetings:

TUESDAY, JUNE 6TH at  6:30 P.M.

Space is limited!
Call now to reserve your space at one of these meetings

[Unicom Logo]  [PECO Logo]