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<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="right" style="font-size: 10pt; margin-top: 12pt">Registration No.&nbsp;333-
</DIV>


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>




<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
</DIV>

<DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM S-8</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 12pt"><B>REGISTRATION STATEMENT<BR>
Under<BR>
THE SECURITIES ACT OF 1933</B>
</DIV>

<DIV align="center"><DIV style="font-size: 3pt; margin-top: 1pt; width: 26%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>EXELON CORPORATION</B>
</DIV>

<DIV align="center" style="font-size: 10pt">(Exact name of registrant as specified in its charter)</DIV>


<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
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<TR valign="bottom">
    <TD align="center" valign="top"><B>Pennsylvania</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>23-2990190</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">(State or other jurisdiction of<BR>
incorporation or organization)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">(I.R.S. Employer Identification No.)</TD>
</TR>
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</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>37</B><SUP style="font-size: 85%; vertical-align: text-top"><B>th</B></SUP> <B>Floor, 10 South Dearborn Street<BR>
Post Office Box 805379<BR>
Chicago, Illinois 60680-5379<BR>
(312)&nbsp;394-7398</B><BR>
(Address of principal executive offices)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>EXELON CORPORATION EMPLOYEE STOCK PURCHASE PLAN<BR>
EXELON CORPORATION EMPLOYEE STOCK PURCHASE PLAN FOR UNINCORPORATED SUBSIDIARIES</B><BR>
(Full title of the plans)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>J. BARRY MITCHELL<BR>
Senior Vice President, Chief Financial Officer and Treasurer<BR>
Exelon Corporation<BR>
37</B><SUP style="font-size: 85%; vertical-align: text-top"><B>th</B></SUP> <B>Floor, 10 South Dearborn Street<BR>
Chicago, Illinois 60680-5379<BR>
(312)&nbsp;394-7398</B><BR>
(Name and address of agent for service)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>CALCULATION OF REGISTRATION FEE</B></DIV>

<DIV align="center">
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    <TD width="1%">&nbsp;</TD>
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    <TD nowrap align="left" colspan="15" style="border-bottom: 3px solid #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Proposed</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Proposed</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
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    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">maximum</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">maximum</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Amount of</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center">Title of securities</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">Amount to be</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">offering price</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">aggregate</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">registration</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center">to be registered</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">registered</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">per share</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">offering price</TD>
    <TD style="border-right: 2px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">fee</TD>
    <TD width="1%">&nbsp;</TD>
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                    <TD style="border-top: 2px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">Common Stock, no par value(1)</DIV></TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">500,000 shares</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$52.00(1)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>

<TD align="center" valign="bottom" style="border-top: 2px solid #000000">$26,000,000(1)</TD>
    <TD style="border-right: 2px solid #000000; border-top: 2px solid #000000">&nbsp;</TD>
    <TD style="border-top: 2px solid #000000">&nbsp;</TD>
    <TD align="center" valign="bottom" style="border-top: 2px solid #000000">$3,060.20</TD>
    <TD width="1%" style="border-top: 2px solid #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="15" style="border-top: 3px solid #000000">&nbsp;</TD>
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</DIV>

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<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left">(1)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Estimated pursuant to Rule 457(h) and (c)&nbsp;solely for the purpose of calculating the
registration fee, based upon the average of the high and low sales prices of shares of the
common stock of Exelon Corporation as reported on the New York Stock Exchange on August&nbsp;8,
2005.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>





<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">






<!-- TOC -->
<A name="toc"><DIV align="CENTER" style="page-break-before:always"><U><B>TABLE OF CONTENTS</B></U></DIV></A>

<P><CENTER>
<TABLE border="0" width="90%" cellpadding="0" cellspacing="0">
<TR>
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</TR>
<TR><TD colspan="9"><A HREF="#000">PART II</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#001">Item&nbsp;3. Incorporation of Documents by Reference</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#002"> Item&nbsp;4. Description of Securities</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#003"> Item&nbsp;5. Interests of Named Experts and Counsel</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#004"> Item&nbsp;6. Indemnification of Directors and Officers</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#005"> Item&nbsp;7. Exemption from Registration Claimed</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#006"> Item&nbsp;8. Exhibits</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#007">Item&nbsp;9. Undertakings</A></TD></TR>
<TR><TD colspan="9"><A HREF="#008">SIGNATURES</A></TD></TR>
<TR><TD colspan="9"><A HREF="#009">EXHIBIT INDEX</A></TD></TR>
<TR><TD colspan="9"><A HREF="c97566exv5w1.htm">Opinion of Sidley Austin Brown & Wood LLP</A></TD></TR>
<TR><TD colspan="9"><A HREF="c97566exv23w1.htm">Consent of PricewaterhouseCoopers LLP</A></TD></TR>
<TR><TD colspan="9"><A HREF="c97566exv24w1.htm">Form of Powers of Attorney</A></TD></TR>
</TABLE>
</CENTER>
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<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>




<!-- link1 "PART II" -->
<DIV align="left"><A NAME="000"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>
</DIV>

<!-- link2 "Item&nbsp;3. Incorporation of Documents by Reference" -->
<DIV align="left"><A NAME="001"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;3. Incorporation of Documents by Reference</B>.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents, as filed by Exelon Corporation (the &#147;<I>Registrant</I>&#148;) with the Securities
and Exchange Commission (the &#147;<I>Commission</I>&#148;), are incorporated by reference in this Registration
Statement and made a part hereof:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 60px; text-indent: -18px">(a) the Registrant&#146;s annual report on Form 10-K for the year ended December&nbsp;31, 2004
(filed on February&nbsp;23, 2005);
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 60px; text-indent: -18px">(b) the Registrant&#146;s quarterly reports on Form 10-Q for the quarters ended March&nbsp;31,
2005 (filed on April&nbsp;26, 2005) and June&nbsp;30, 2005 (filed on July&nbsp;26, 2005);
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 60px; text-indent: -18px">(c) the Registrant&#146;s Current Reports on Form 8-K dated January&nbsp;24, 2005 (filed on
January&nbsp;28, 2005), January&nbsp;31, 2005 (filed on February&nbsp;1, 2005), February&nbsp;4, 2005 (filed on
February&nbsp;4, 2005), February&nbsp;22, 2005 (filed on February&nbsp;22, 2005), February&nbsp;23, 2005 (filed
on February&nbsp;25, 2005), March&nbsp;4, 2005 (filed on March&nbsp;7, 2005), March&nbsp;7, 2005 (filed on March
8, 2005), March&nbsp;30, 2005 (filed on March&nbsp;30, 2005), April&nbsp;1, 2005 (filed on April&nbsp;5, 2005),
April&nbsp;26, 2005 (filed on April&nbsp;27, 2005 and amended on June&nbsp;30, 2005), May&nbsp;9, 2005 (filed on
May&nbsp;10, 2005), May&nbsp;13, 2005 (filed on May&nbsp;13, 2005), June&nbsp;6, 2005 (filed on June&nbsp;7, 2005),
June&nbsp;9, 2005 (filed on June&nbsp;10, 2005), June&nbsp;30, 2005 (filed on June&nbsp;30, 2005) and July&nbsp;12,
2005 (filed on July&nbsp;12, 2005); and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 60px; text-indent: -18px">(d) the description of the Registrant&#146;s common stock contained in the registration
statement on Form 8-A filed under the Securities Exchange Act of 1934, as amended (the
&#147;<I>Exchange Act</I>&#148;), including any amendment thereto or report filed for the purpose of updating
such description.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All reports and other documents subsequently filed by the Registrant pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a post-effective amendment
which indicates that all securities offered hereby have been sold or which deregisters all
securities then remaining unsold, shall be deemed to be incorporated by reference herein and to be
part hereof from the date of filing of such documents. Any statement contained in any document,
all or a portion of which is incorporated by reference herein, shall be deemed to be modified or
superseded for purposes of this Registration Statement to the extent that a statement contained or
incorporated by reference herein modifies or supersedes such statement. Any statement so modified
or superseded shall not be deemed, except as so modified or superseded, to constitute a part of
this Registration Statement.
</DIV>
<!-- link2 " Item&nbsp;4. Description of Securities" -->
<DIV align="left"><A NAME="002"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;4. Description of Securities.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>
<!-- link2 " Item&nbsp;5. Interests of Named Experts and Counsel" -->
<DIV align="left"><A NAME="003"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;5. Interests of Named Experts and Counsel.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link2 " Item&nbsp;6. Indemnification of Directors and Officers" -->
<DIV align="left"><A NAME="004"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;6. Indemnification of Directors and Officers.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Chapter&nbsp;17, Subchapter D of the Pennsylvania Business Corporation Law of 1988, as amended (the
"<I>PBCL</I>&#148;) contains provisions permitting indemnification of officers and directors of a business
corporation incorporated in Pennsylvania. Sections&nbsp;1741 and 1742 of the PBCL provide that a
business corporation may indemnify directors and officers against liabilities and expenses he or
she may incur in connection with a threatened, pending or completed civil, administrative or
investigative proceeding by reason of the fact that he or she is or was a representative of the
corporation or was serving at the request of the corporation as a representative of another
enterprise, provided that the particular person acted in good faith and in a manner he or she
reasonably believed to be in, or not opposed to, the best interests of the corporation, and, with
respect to any criminal proceeding, had no reasonable cause to believe his or her conduct was
unlawful. In general, the power to indemnify under these sections does not exist in the case of
actions against a director or officer by or in the right of the corporation if the person otherwise
entitled to indemnification shall have been adjudged to be liable to the corporation, unless it is
judicially determined that, despite the adjudication of liability but in view of all the
circumstances of the case, the person is fairly and reasonably entitled to indemnification for the
expenses the court deems proper. Section&nbsp;1743 of the PBCL provides that the corporation is
required to indemnify directors and officers against expenses they may incur in defending these
actions if they are successful on the merits or otherwise in the defense of such actions.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;1746 of the PBCL provides that indemnification under the other sections of Subchapter
D is not exclusive of other rights that a person seeking indemnification may have under any by-law,
agreement, vote of shareholders or disinterested directors or otherwise, whether or not the
corporation would have the power to indemnify the person under any other provision of law.
However, Section&nbsp;1746 prohibits indemnification in circumstances where the act or failure to act
giving rise to the claim for indemnification is determined by a court to have constituted willful
misconduct or recklessness.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;1747 of the PBCL permits a corporation to purchase and maintain insurance on behalf of
any person who is or was a director or officer of the corporation, or is or was serving at the
request of the corporation as a representative of another enterprise, against any liability
asserted against such person and incurred by him or her in that capacity, or arising out of his
status as such, whether or not the corporation would have the power to indemnify the person against
such liability under Subchapter D.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant&#146;s by-laws provide that it is obligated to indemnify directors and officers and
other persons designated by the board of directors against any liability, including any damage,
judgment, amount paid in settlement, fine, penalty, cost or expense (including, without limitation,
attorneys&#146; fees and disbursements) incurred in connection with any proceeding. The Registrant&#146;s
by-laws provide that no indemnification shall be made where the act or failure to act giving rise
to the claim for indemnification is determined by arbitration or otherwise to have constituted
willful misconduct or recklessness or attributable to receipt from the Registrant of a personal
benefit to which the recipient is not legally entitled.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As permitted by PBCL Section&nbsp;1713, the Registrant&#146;s by-laws provide that directors generally
will not be liable for monetary damages in any action, whether brought by shareholders directly or
in the right of the Registrant or by third parties, unless they fail in the good faith performance
of their duties as fiduciaries (the standard of care established by the PBCL), and such failure
constitutes self-dealing, willful misconduct or recklessness.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant has purchased directors&#146; and officers&#146; liability insurance.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link2 " Item&nbsp;7. Exemption from Registration Claimed" -->
<DIV align="left"><A NAME="005"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;7. Exemption from Registration Claimed.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not applicable.
</DIV>
<!-- link2 " Item&nbsp;8. Exhibits" -->
<DIV align="left"><A NAME="006"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8. Exhibits.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following is a list of exhibits filed as part of this Registration Statement.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="93%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left">Exhibit</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Number</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Description of Exhibit</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Articles of Incorporation of Registrant (incorporated
herein by reference to Exhibit&nbsp;3.1 of the Registrant&#146;s
Registration Statement on Form&nbsp;S-4, Registration Statement
No.&nbsp;333-37082).</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amendment to Articles of Incorporation of Registrant
(incorporated herein by reference to Exhibit&nbsp;3-1 to the
Registrant&#146;s Form&nbsp;10-Q for the quarter ended June&nbsp;30, 2004,
File No.&nbsp;1-16169).</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Exelon Corporation Employee Stock Purchase Plan
(incorporated herein by reference to Exhibit&nbsp;4.2 of the
Registrant&#146;s Registration Statement on Form&nbsp;S-8,
Registration Statement No.&nbsp;333-61390).</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.4
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Exelon Corporation Employee Stock Purchase Plan for
Unincorporated Subsidiaries (incorporated herein by
reference to Annex I of the Registrant&#146;s Joint Proxy
Statement and Prospectus dated May&nbsp;31, 2005, Registration
Statement No.&nbsp;333-122704, filed on June&nbsp;3, 2005 pursuant to
Rule&nbsp;424(b)(3)).</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Sidley Austin Brown &#038; Wood LLP.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of PricewaterhouseCoopers LLP.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Sidley Austin Brown &#038; Wood LLP (included in its
opinion filed as Exhibit&nbsp;5.1 hereof).</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form of Powers of Attorney.</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<!-- link2 "Item&nbsp;9. Undertakings" -->
<DIV align="left"><A NAME="007"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;9. Undertakings.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;The undersigned registrant hereby undertakes:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 80px; text-indent: -22px">(i)&nbsp;&nbsp;&nbsp;To include any prospectus required by Section&nbsp;10(a)(3) of the Securities
Act of 1933;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 80px; text-indent: -22px">(ii)&nbsp; To reflect in the prospectus any facts or events arising after the
effective date of the registration statement (or the most recent post-effective
amendment thereof) which, individually or in the aggregate, represent a fundamental
change in the information set forth in the registration statement; and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 80px; text-indent: -23px">(iii) To include any material information with respect to the plan of
distribution not previously disclosed in the registration statement or any material
change to
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 6%">such information in the registration statement;
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 3%"><I>Provided, however</I>, that paragraphs (a)(1)(i) and (a)(1)(ii) of this section do not apply if
the information required to be included in a post-effective amendment by those paragraphs is
contained in periodic reports filed with or furnished to the Securities and Exchange
Commission by the Registrant pursuant to Section&nbsp;13 or Section 15(d) of the Securities
Exchange Act of 1934 that are incorporated by reference in the registration statement.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 55px; text-indent: -18px">(2) That, for the purpose of determining any liability under the Securities Act of
1933, each such post-effective amendment shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities at that time
shall be deemed to be the initial bona fide offering thereof.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 55px; text-indent: -18px">(3) To remove from registration by means of a post-effective amendment any of the
securities being registered that remain unsold at the termination of the offering.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 32px; text-indent: -18px">(b)&nbsp;The undersigned registrant hereby undertakes that, for the purpose of determining any
liability under the Securities Act of 1933, each filing of the Registrant&#146;s annual report pursuant
to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 that is incorporated by
reference in this registration statement shall be deemed to be a new registration statement
relating to the securities offered therein and the offering of such securities at that time shall
be deemed to be the initial bona fide offering thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 32px; text-indent: -18px">(c)&nbsp;Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be
permitted to directors, officers and controlling persons of the registrant pursuant to the
foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy as expressed in
the Act and is, therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred or paid by a
director, officer or controlling person of the registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person in connection with
the securities being registered, the registrant will, unless in the opinion of its counsel the
matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the
question whether such indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.
</DIV>

<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<!-- link1 "SIGNATURES " -->
<DIV align="left"><A NAME="008"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant
has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and
has duly caused this Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in Chicago, Illinois on the 10<SUP style="font-size: 85%; vertical-align: text-top">th</SUP>&nbsp;day of August, 2005.
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left">EXELON CORPORATION <BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD valign="top">By:&nbsp;&nbsp;</TD>

<TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ John W. Rowe
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">John W. Rowe&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Chairman and Chief Executive Officer&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration
Statement has been signed below by the following persons in the capacities and on the indicated
date.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="31%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="32%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="31%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Signature</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Capacity</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Date</TD>
</TR>

<TR><TD>&nbsp;</TD></TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">

<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ John W. Rowe
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Chairman and Chief Executive
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">August 10, 2005</TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="1" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">John W. Rowe
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Officer and Director</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">

<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ John F. Young
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Executive Vice President,
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">August 10, 2005</TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="1" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">John F. Young
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Finance and Markets</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">(Principal Financial Officer)</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ J. Barry Mitchell
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Senior Vice President, Chief
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">August 10, 2005</TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="1" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">J. Barry Mitchell
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Financial Officer and Treasurer</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">(Principal Financial Officer)</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">

<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Matthew F. Hilzinger
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Vice President and Corporate Controller
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">August 10, 2005</TD>
</TR>
<TR style="font-size: 1px">
    <TD colspan="1" valign="top" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Matthew F. Hilzinger
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">(Principal Accounting Officer)</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This Registration Statement has also been signed by J. Barry Mitchell in his individual
capacity as Attorney-in-Fact on behalf of the following Directors on the date indicated:
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="40%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="55%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">Edward A. Brennan
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">M. Walter D&#146;Alessio</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">Nicholas DeBenedictis
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Admiral Bruce DeMars</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">Nelson A. Diaz
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Sue L. Gin</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">Rosemarie B. Greco
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Edgar D. Jannotta</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">John M. Palms
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">William C. Richardson</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">Thomas J. Ridge
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">John W. Rogers</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">John W. Rowe
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Ronald Rubin</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">Richard L. Thomas</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">By:
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ J. Barry Mitchell
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Date: August 10, 2005</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">J. Barry Mitchell</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">(Attorney-in-Fact for the Directors set forth above)</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<!-- link1 "EXHIBIT INDEX" -->
<DIV align="left"><A NAME="009"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><U><B>EXHIBIT INDEX</B></U>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="5%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="93%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left">Exhibit</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Number</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Description of Exhibit</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Articles of Incorporation of Registrant (incorporated
herein by reference to Exhibit&nbsp;3.1 of the Registrant&#146;s
Registration Statement on Form&nbsp;S-4, Registration Statement
No.&nbsp;333-37082).</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amendment to Articles of Incorporation of Registrant
(incorporated herein by reference to Exhibit&nbsp;3-1 to the
Registrant&#146;s Form&nbsp;10-Q for the quarter ended June&nbsp;30, 2004,
File No.&nbsp;1-16169).</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Exelon Corporation Employee Stock Purchase Plan
(incorporated herein by reference to Exhibit&nbsp;4.2 of the
Registrant&#146;s Registration Statement on Form&nbsp;S-8,
Registration Statement No.&nbsp;333-61390).</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.4
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Exelon Corporation Employee Stock Purchase Plan for
Unincorporated Subsidiaries (incorporated herein by
reference to Annex I of the Registrant&#146;s Joint Proxy
Statement and Prospectus dated May&nbsp;31, 2005, Registration
Statement No.&nbsp;333-122704, filed on June&nbsp;3, 2005 pursuant to
Rule&nbsp;424(b)(3)).</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Sidley Austin Brown &#038; Wood LLP.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of PricewaterhouseCoopers LLP.</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Sidley Austin Brown &#038; Wood LLP (included in its
opinion filed as Exhibit&nbsp;5.1 hereof).</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Form of Powers of Attorney.</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt">&nbsp;
</DIV>

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sv8
Table of Contents
Registration No. 333-
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
Under
THE SECURITIES ACT OF 1933
EXELON CORPORATION
(Exact name of registrant as specified in its charter)
Pennsylvania
23-2990190
(State or other jurisdiction of
incorporation or organization)
(I.R.S. Employer Identification No.)
37
th
Floor, 10 South Dearborn Street
Post Office Box 805379
Chicago, Illinois 60680-5379
(312) 394-7398
(Address of principal executive offices)
EXELON CORPORATION EMPLOYEE STOCK PURCHASE PLAN
EXELON CORPORATION EMPLOYEE STOCK PURCHASE PLAN FOR UNINCORPORATED SUBSIDIARIES
(Full title of the plans)
J. BARRY MITCHELL
Senior Vice President, Chief Financial Officer and Treasurer
Exelon Corporation
37
th
Floor, 10 South Dearborn Street
Chicago, Illinois 60680-5379
(312) 394-7398
(Name and address of agent for service)
CALCULATION OF REGISTRATION FEE
Proposed
Proposed
maximum
maximum
Amount of
Title of securities
Amount to be
offering price
aggregate
registration
to be registered
registered
per share
offering price
fee
Common Stock, no par value(1)
500,000 shares
$52.00(1)
$26,000,000(1)
$3,060.20
(1)
Estimated pursuant to Rule 457(h) and (c) solely for the purpose of calculating the
registration fee, based upon the average of the high and low sales prices of shares of the
common stock of Exelon Corporation as reported on the New York Stock Exchange on August 8,
2005.
TABLE OF CONTENTS
PART II
Item 3. Incorporation of Documents by Reference
Item 4. Description of Securities
Item 5. Interests of Named Experts and Counsel
Item 6. Indemnification of Directors and Officers
Item 7. Exemption from Registration Claimed
Item 8. Exhibits
Item 9. Undertakings
SIGNATURES
EXHIBIT INDEX
Opinion of Sidley Austin Brown & Wood LLP
Consent of PricewaterhouseCoopers LLP
Form of Powers of Attorney
Table of Contents
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference
.
The following documents, as filed by Exelon Corporation (the "
Registrant
") with the Securities
and Exchange Commission (the "
Commission
"), are incorporated by reference in this Registration
Statement and made a part hereof:
(a) the Registrant's annual report on Form 10-K for the year ended December 31, 2004
(filed on February 23, 2005);
(b) the Registrant's quarterly reports on Form 10-Q for the quarters ended March 31,
2005 (filed on April 26, 2005) and June 30, 2005 (filed on July 26, 2005);
(c) the Registrant's Current Reports on Form 8-K dated January 24, 2005 (filed on
January 28, 2005), January 31, 2005 (filed on February 1, 2005), February 4, 2005 (filed on
February 4, 2005), February 22, 2005 (filed on February 22, 2005), February 23, 2005 (filed
on February 25, 2005), March 4, 2005 (filed on March 7, 2005), March 7, 2005 (filed on March
8, 2005), March 30, 2005 (filed on March 30, 2005), April 1, 2005 (filed on April 5, 2005),
April 26, 2005 (filed on April 27, 2005 and amended on June 30, 2005), May 9, 2005 (filed on
May 10, 2005), May 13, 2005 (filed on May 13, 2005), June 6, 2005 (filed on June 7, 2005),
June 9, 2005 (filed on June 10, 2005), June 30, 2005 (filed on June 30, 2005) and July 12,
2005 (filed on July 12, 2005); and
(d) the description of the Registrant's common stock contained in the registration
statement on Form 8-A filed under the Securities Exchange Act of 1934, as amended (the
"
Exchange Act
"), including any amendment thereto or report filed for the purpose of updating
such description.
All reports and other documents subsequently filed by the Registrant pursuant to Sections
13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a post-effective amendment
which indicates that all securities offered hereby have been sold or which deregisters all
securities then remaining unsold, shall be deemed to be incorporated by reference herein and to be
part hereof from the date of filing of such documents. Any statement contained in any document,
all or a portion of which is incorporated by reference herein, shall be deemed to be modified or
superseded for purposes of this Registration Statement to the extent that a statement contained or
incorporated by reference herein modifies or supersedes such statement. Any statement so modified
or superseded shall not be deemed, except as so modified or superseded, to constitute a part of
this Registration Statement.
Item 4. Description of Securities.
Not applicable.
Item 5. Interests of Named Experts and Counsel.
Not applicable.
Table of Contents
Item 6. Indemnification of Directors and Officers.
Chapter 17, Subchapter D of the Pennsylvania Business Corporation Law of 1988, as amended (the
"
PBCL
") contains provisions permitting indemnification of officers and directors of a business
corporation incorporated in Pennsylvania. Sections 1741 and 1742 of the PBCL provide that a
business corporation may indemnify directors and officers against liabilities and expenses he or
she may incur in connection with a threatened, pending or completed civil, administrative or
investigative proceeding by reason of the fact that he or she is or was a representative of the
corporation or was serving at the request of the corporation as a representative of another
enterprise, provided that the particular person acted in good faith and in a manner he or she
reasonably believed to be in, or not opposed to, the best interests of the corporation, and, with
respect to any criminal proceeding, had no reasonable cause to believe his or her conduct was
unlawful. In general, the power to indemnify under these sections does not exist in the case of
actions against a director or officer by or in the right of the corporation if the person otherwise
entitled to indemnification shall have been adjudged to be liable to the corporation, unless it is
judicially determined that, despite the adjudication of liability but in view of all the
circumstances of the case, the person is fairly and reasonably entitled to indemnification for the
expenses the court deems proper. Section 1743 of the PBCL provides that the corporation is
required to indemnify directors and officers against expenses they may incur in defending these
actions if they are successful on the merits or otherwise in the defense of such actions.
Section 1746 of the PBCL provides that indemnification under the other sections of Subchapter
D is not exclusive of other rights that a person seeking indemnification may have under any by-law,
agreement, vote of shareholders or disinterested directors or otherwise, whether or not the
corporation would have the power to indemnify the person under any other provision of law.
However, Section 1746 prohibits indemnification in circumstances where the act or failure to act
giving rise to the claim for indemnification is determined by a court to have constituted willful
misconduct or recklessness.
Section 1747 of the PBCL permits a corporation to purchase and maintain insurance on behalf of
any person who is or was a director or officer of the corporation, or is or was serving at the
request of the corporation as a representative of another enterprise, against any liability
asserted against such person and incurred by him or her in that capacity, or arising out of his
status as such, whether or not the corporation would have the power to indemnify the person against
such liability under Subchapter D.
The Registrant's by-laws provide that it is obligated to indemnify directors and officers and
other persons designated by the board of directors against any liability, including any damage,
judgment, amount paid in settlement, fine, penalty, cost or expense (including, without limitation,
attorneys' fees and disbursements) incurred in connection with any proceeding. The Registrant's
by-laws provide that no indemnification shall be made where the act or failure to act giving rise
to the claim for indemnification is determined by arbitration or otherwise to have constituted
willful misconduct or recklessness or attributable to receipt from the Registrant of a personal
benefit to which the recipient is not legally entitled.
As permitted by PBCL Section 1713, the Registrant's by-laws provide that directors generally
will not be liable for monetary damages in any action, whether brought by shareholders directly or
in the right of the Registrant or by third parties, unless they fail in the good faith performance
of their duties as fiduciaries (the standard of care established by the PBCL), and such failure
constitutes self-dealing, willful misconduct or recklessness.
The Registrant has purchased directors' and officers' liability insurance.
Table of Contents
Item 7. Exemption from Registration Claimed.
Not applicable.
Item 8. Exhibits.
The following is a list of exhibits filed as part of this Registration Statement.
Exhibit
Number
Description of Exhibit
4.1
Articles of Incorporation of Registrant (incorporated
herein by reference to Exhibit 3.1 of the Registrant's
Registration Statement on Form S-4, Registration Statement
No. 333-37082).
4.2
Amendment to Articles of Incorporation of Registrant
(incorporated herein by reference to Exhibit 3-1 to the
Registrant's Form 10-Q for the quarter ended June 30, 2004,
File No. 1-16169).
4.3
Exelon Corporation Employee Stock Purchase Plan
(incorporated herein by reference to Exhibit 4.2 of the
Registrant's Registration Statement on Form S-8,
Registration Statement No. 333-61390).
4.4
Exelon Corporation Employee Stock Purchase Plan for
Unincorporated Subsidiaries (incorporated herein by
reference to Annex I of the Registrant's Joint Proxy
Statement and Prospectus dated May 31, 2005, Registration
Statement No. 333-122704, filed on June 3, 2005 pursuant to
Rule 424(b)(3)).
5.1
Opinion of Sidley Austin Brown & Wood LLP.
23.1
Consent of PricewaterhouseCoopers LLP.
23.2
Consent of Sidley Austin Brown & Wood LLP (included in its
opinion filed as Exhibit 5.1 hereof).
24.1
Form of Powers of Attorney.
Item 9. Undertakings.
(a) The undersigned registrant hereby undertakes:
(1) To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement:
(i)   To include any prospectus required by Section 10(a)(3) of the Securities
Act of 1933;
(ii)  To reflect in the prospectus any facts or events arising after the
effective date of the registration statement (or the most recent post-effective
amendment thereof) which, individually or in the aggregate, represent a fundamental
change in the information set forth in the registration statement; and
(iii) To include any material information with respect to the plan of
distribution not previously disclosed in the registration statement or any material
change to
Table of Contents
such information in the registration statement;
Provided, however
, that paragraphs (a)(1)(i) and (a)(1)(ii) of this section do not apply if
the information required to be included in a post-effective amendment by those paragraphs is
contained in periodic reports filed with or furnished to the Securities and Exchange
Commission by the Registrant pursuant to Section 13 or Section 15(d) of the Securities
Exchange Act of 1934 that are incorporated by reference in the registration statement.
(2) That, for the purpose of determining any liability under the Securities Act of
1933, each such post-effective amendment shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities at that time
shall be deemed to be the initial bona fide offering thereof.
(3) To remove from registration by means of a post-effective amendment any of the
securities being registered that remain unsold at the termination of the offering.
(b) The undersigned registrant hereby undertakes that, for the purpose of determining any
liability under the Securities Act of 1933, each filing of the Registrant's annual report pursuant
to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 that is incorporated by
reference in this registration statement shall be deemed to be a new registration statement
relating to the securities offered therein and the offering of such securities at that time shall
be deemed to be the initial bona fide offering thereof.
(c) Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be
permitted to directors, officers and controlling persons of the registrant pursuant to the
foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy as expressed in
the Act and is, therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred or paid by a
director, officer or controlling person of the registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person in connection with
the securities being registered, the registrant will, unless in the opinion of its counsel the
matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the
question whether such indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.
Table of Contents
SIGNATURES
Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant
has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and
has duly caused this Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in Chicago, Illinois on the 10
th
day of August, 2005.
EXELON CORPORATION
By:
/s/ John W. Rowe
John W. Rowe
Chairman and Chief Executive Officer
Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration
Statement has been signed below by the following persons in the capacities and on the indicated
date.
Signature
Capacity
Date
/s/ John W. Rowe
Chairman and Chief Executive
August 10, 2005
John W. Rowe
Officer and Director
/s/ John F. Young
Executive Vice President,
August 10, 2005
John F. Young
Finance and Markets
(Principal Financial Officer)
/s/ J. Barry Mitchell
Senior Vice President, Chief
August 10, 2005
J. Barry Mitchell
Financial Officer and Treasurer
(Principal Financial Officer)
/s/ Matthew F. Hilzinger
Vice President and Corporate Controller
August 10, 2005
Matthew F. Hilzinger
(Principal Accounting Officer)
This Registration Statement has also been signed by J. Barry Mitchell in his individual
capacity as Attorney-in-Fact on behalf of the following Directors on the date indicated:
Edward A. Brennan
M. Walter D'Alessio
Nicholas DeBenedictis
Admiral Bruce DeMars
Nelson A. Diaz
Sue L. Gin
Rosemarie B. Greco
Edgar D. Jannotta
John M. Palms
William C. Richardson
Thomas J. Ridge
John W. Rogers
John W. Rowe
Ronald Rubin
Richard L. Thomas
By:
/s/ J. Barry Mitchell
Date: August 10, 2005
J. Barry Mitchell
(Attorney-in-Fact for the Directors set forth above)
Table of Contents
EXHIBIT INDEX
Exhibit
Number
Description of Exhibit
4.1
Articles of Incorporation of Registrant (incorporated
herein by reference to Exhibit 3.1 of the Registrant's
Registration Statement on Form S-4, Registration Statement
No. 333-37082).
4.2
Amendment to Articles of Incorporation of Registrant
(incorporated herein by reference to Exhibit 3-1 to the
Registrant's Form 10-Q for the quarter ended June 30, 2004,
File No. 1-16169).
4.3
Exelon Corporation Employee Stock Purchase Plan
(incorporated herein by reference to Exhibit 4.2 of the
Registrant's Registration Statement on Form S-8,
Registration Statement No. 333-61390).
4.4
Exelon Corporation Employee Stock Purchase Plan for
Unincorporated Subsidiaries (incorporated herein by
reference to Annex I of the Registrant's Joint Proxy
Statement and Prospectus dated May 31, 2005, Registration
Statement No. 333-122704, filed on June 3, 2005 pursuant to
Rule 424(b)(3)).
5.1
Opinion of Sidley Austin Brown & Wood LLP.
23.1
Consent of PricewaterhouseCoopers LLP.
23.2
Consent of Sidley Austin Brown & Wood LLP (included in its
opinion filed as Exhibit 5.1 hereof).
24.1
Form of Powers of Attorney.