Legal Acknowledgement

Exelon Constellation Merger

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Cautionary Statements Regarding Forward-Looking Information.

Except for the historical information contained herein, certain of the matters discussed in this communication constitute “forward-looking statements” within the meaning of the Securities Act of 1933 and the Securities Exchange Act of 1934, both as amended by the Private Securities Litigation Reform Act of 1995. Words such as “may,” “will,” “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” “target,” “forecast,” and words and terms of similar substance used in connection with any discussion of future plans, actions, or events identify forward-looking statements. These forward-looking statements include, but are not limited to, statements regarding benefits of the proposed merger of Exelon Corporation (Exelon) and Constellation Energy Group, Inc. (Constellation), integration plans and expected synergies, the expected timing of completion of the transaction, anticipated future financial and operating performance and results, including estimates for growth. These statements are based on the current expectations of management of Exelon and Constellation, as applicable. There are a number of risks and uncertainties that could cause actual results to differ materially from the forward-looking statements included in this communication regarding the proposed merger. For example, (1) the companies may be unable to obtain shareholder approvals required for the merger; (2) the companies may be unable to obtain regulatory approvals required for the merger, or required regulatory approvals may delay the merger or result in the imposition of conditions that could have a material adverse effect on the combined company or cause the companies to abandon the merger; (3) conditions to the closing of the merger may not be satisfied; (4) an unsolicited offer of another company to acquire assets or capital stock of Exelon or Constellation could interfere with the merger; (5) problems may arise in successfully integrating the businesses of the companies, which may result in the combined company not operating as effectively and efficiently as expected; (6) the combined company may be unable to achieve cost-cutting synergies or it may take longer than expected to achieve those synergies; (7) the merger may involve unexpected costs, unexpected liabilities or unexpected delays, or the effects of purchase accounting may be different from the companies’ expectations; (8) the credit ratings of the combined company or its subsidiaries may be different from what the companies expect; (9) the businesses of the companies may suffer as a result of uncertainty surrounding the merger; (10) the companies may not realize the values expected to be obtained for properties expected or required to be divested; (11) the industry may be subject to future regulatory or legislative actions that could adversely affect the companies; and (12) the companies may be adversely affected by other economic, business, and/or competitive factors. Other unknown or unpredictable factors could also have material adverse effects on future results, performance or achievements of Exelon, Constellation or the combined company. Discussions of some of these other important factors and assumptions are contained in Exelon’s and Constellation’s respective filings with the Securities and Exchange Commission (SEC), and available at the SEC’s website at www.sec.gov, including: (1) Exelon’s 2010 Annual Report on Form 10-K in (a) ITEM 1A. Risk Factors, (b) ITEM 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations and (c) ITEM 8. Financial Statements and Supplementary Data: Note 18; (2) Exelon’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011 in (a) Part II, Other Information, ITEM 1A. Risk Factors, (b) Part 1, Financial Information, ITEM 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations and (c) Part I, Financial Information, ITEM 1. Financial Statements: Note 13; (3) Constellation’s 2010 Annual Report on Form 10-K in (a) ITEM 1A. Risk Factors, (b) ITEM 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations and (c) ITEM 8. Financial Statements and Supplementary Data: Note 12; and (4) Constellation’s Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011 in (a) Part II, Other Information, ITEM 1A. Risk Factors and ITEM 5. Other Information, (b) Part I, Financial Information, ITEM 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations and (c) Part I, Financial Information, ITEM 1. Financial Statements: Notes to Consolidated Financial Statements, Commitments and Contingencies. These risks, as well as other risks associated with the proposed merger, are more fully discussed in the preliminary joint proxy statement/prospectus included in Amendment No. 1 to the Registration Statement on Form S-4 that Exelon filed with the SEC on August 17, 2011 in connection with the proposed merger. In light of these risks, uncertainties, assumptions and factors, the forward-looking events discussed in this communication may not occur. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this communication. Neither Exelon nor Constellation undertake any obligation to publicly release any revision to its forward-looking statements to reflect events or circumstances after the date of this communication.

Additional Information and Where to Find it

This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities, or a solicitation of any vote or approval, nor shall there be any sale of securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such jurisdiction. On August 17, 2011, Exelon filed with the SEC Amendment No. 1 to its Registration Statement on Form S-4 that included a preliminary joint proxy statement/prospectus and other relevant documents to be mailed by Exelon and Constellation to their respective security holders in connection with the proposed merger of Exelon and Constellation. These materials are not yet final and may be amended. WE URGE INVESTORS AND SECURITY HOLDERS TO READ THE PRELIMINARY JOINT PROXY STATEMENT/PROSPECTUS AND THE DEFINITIVE JOINT PROXY STATEMENT/PROSPECTUS AND ANY OTHER RELEVANT DOCUMENTS WHEN THEY BECOME AVAILABLE, BECAUSE THEY CONTAIN OR WILL CONTAIN IMPORTANT INFORMATION about Exelon, Constellation and the proposed merger. Investors and security holders will be able to obtain these materials (when they are available) and other documents filed with the SEC free of charge at the SEC's website, www.sec.gov. In addition, a copy of the preliminary joint proxy statement/prospectus and definitive joint proxy statement/prospectus (when it becomes available) may be obtained free of charge from Exelon Corporation, Investor Relations, 10 South Dearborn Street, P.O. Box 805398, Chicago, Illinois 60680-5398, or from Constellation Energy Group, Inc., Investor Relations, 100 Constellation Way, Suite 600C, Baltimore, MD 21202. Investors and security holders may also read and copy any reports, statements and other information filed by Exelon, or Constellation, with the SEC, at the SEC public reference room at 100 F Street, N.E., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 or visit the SEC’s website for further information on its public reference room.

Participants in the Merger Solicitation

Exelon, Constellation, and their respective directors, executive officers and certain other members of management and employees may be deemed to be participants in the solicitation of proxies in respect of the proposed transaction. Information regarding Exelon’s directors and executive officers is available in its proxy statement filed with the SEC by Exelon on March 24, 2011 in connection with its 2011 annual meeting of shareholders, and information regarding Constellation’s directors and executive officers is available in its proxy statement filed with the SEC by Constellation on April 15, 2011 in connection with its 2011 annual meeting of shareholders. Other information regarding the participants in the proxy solicitation and a description of their direct and indirect interests, by security holdings or otherwise, is contained in the preliminary joint proxy statement/prospectus and will be contained in the definitive joint proxy statement/prospectus.

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Exelon Corporation and Constellation Energy

The boards of directors of Exelon Corporation (NYSE: EXC) and Constellation Energy (NYSE: CEG) have agreed to combine the two companies in a stock-for-stock transaction. The merger creates the number one competitive energy provider with one of the industry’s cleanest and lowest-cost power generation fleets and one of the largest commercial, industrial and residential customer bases in the United States.

Read the Merger Press Release
Analyst Conference Call and Webcast

Terms of Use

Exelon Terms of Use

You have accessed a web site of Exelon Corporation, its major affiliates Commonwealth Edison Company ("ComEd") and PECO Energy Company ("PECO"), and Exelon's other subsidiaries and affiliates (hereinafter referred to collectively as "Exelon.") For purposes of these Terms and Conditions, the "Site" includes the web site of Exelon ("www.exeloncorp.com") and the "sub-sites" of ComEd (www.comed.com), PECO (www.PECO.com), and any of Exelon's other subsidiaries and affiliates.

By browsing and/or using this Site, you are agreeing to accept, unconditionally and without modification, the terms and conditions which follow, together with all applicable laws ("Terms of Use"). You also agree to review the Exelon Privacy Policy by clicking the link at the bottom of any page on the site.

If any of the Terms of Use are not acceptable to you, do not browse or use this Site.

This site is owned by Exelon and unless specifically stated or otherwise indicated, all service marks, trademarks, logos and trade names appearing on this Site, including but not limited to the EXELON logo, the ComEd logo, and the PECO logo are the property of Exelon. Nothing on this Site should be construed as granting by implication, estoppel, or otherwise, a license or right to use any mark displayed on this Site, without the prior written permission of Exelon. Service marks, trademarks, logos and trade names owned by third parties may also appear on the Site and you should respect those property rights as well. Exelon obtains permission to use any marks owned by third parties that are available on this Site.

The copyright in all pages making up this Site, and all text and images displayed (the "Site Content"), is owned by Exelon, unless otherwise noted. None of the Site Content may be copied, modified, downloaded, reproduced, revised, distributed, published, reused, or used to create derivative works, without the prior written permission of Exelon; provided, you may print one copy solely for your personal, non-commercial use so long as you do not remove or alter any copyright, trademark, trade name, service mark or any other proprietary notices. Exelon does not warrant or represent that use of this Site will not infringe rights of third parties.

Links to the Exelon Web Site

Exelon prohibits linking to any portion of the Site other than the homepage ("www.exeloncorp.com") without prior written notice to and permission from Exelon. You are permitted to link to the homepage ("www.exeloncorp.com") so long as the link does not cause confusion or falsely imply affiliation with, or sponsorship by, Exelon.

External Links

This Site may contain links to external, third party sites. By providing links to other sites, Exelon does not guarantee, approve or endorse the information or products available on those sites, nor does a link indicate any association with or endorsement by Exelon or the Site. Exelon does not operate or control and is not responsible for the content of any linked site. If you visit, browse or use such linked sites, you assume any and all risks, and Exelon assumes no liability whatsoever with respect to such linked sites.

You may use this Site for lawful purposes only. You are prohibited from using this Site, or transmitted to or through this Site, any unlawful, threatening, obscene, defamatory, libelous, harassing, pornographic, hateful or ethnically or racially otherwise objectionable material, or any material that would contribute to a civil or criminal offense, otherwise violates any law, or which infringes on any intellectual property right.

Use of Site

Any attempt to gain unauthorized access to the Site or its content through hacking, bypassing any security features, or other means and any use of, or posting any content on the Site that could destroy, damage or impair any portion of the Site or any computers, systems, hardware or software used by Exelon or other visitors to the Site is prohibited. If you violate any portion of these Terms of Use, we reserve the right, without obligation to do so, to deny you access to the Site, remove any Content you may have posted on the Site and/or pursue our legal remedies.

The Site is not primarily intended for or marketed to children, but is intended for adults 18 years of age or older.

Exelon does not accept or consider creative ideas, submissions, suggestions, content, postings or other materials you post or submit to or through the Site (hereafter, "Submissions") other than those that Exelon may specifically request through the Site. If you ignore this and do send Exelon Submissions without being requested to do so, you thereby grant to Exelon a royalty-free, perpetual, irrevocable, worldwide, non-exclusive right and license to use, reproduce, modify, adapt, publish, translate, create derivative works from, distribute, perform, display and otherwise use in its business all Submissions and to incorporate such in other works in any form, media, or technology, now known or later developed without compensation to you. No Submissions will be treated as confidential.

Copyright Infringement

If you believe that any Content on the Site infringes your copyright and you want the Content removed from the Site, please send a detailed message by mail or email to:
Exelon Legal Department
10 South Dearborn Street
Chicago, IL 60603

Under the Digital Millennium Copyright Act, the following information must be included in the message to us:

  1. A physical or electronic signature of a person authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.
  2. Identification of the copyrighted work claimed to have been infringed, or, if multiple copyrighted works at a single online site are covered by a single notification, a representative list of such works at that site.
  3. Identification of the material that is claimed to be infringing or to be the subject of infringing activity and that is to be removed or access to which is to be disabled, and information reasonably sufficient to permit the service provider to locate the material.
  4. Information reasonably sufficient to permit the service provider to contact the complaining party, such as an address, telephone number, and, if available, an electronic mail address at which the complaining party may be contacted.
  5. A statement that the complaining party has a good faith belief that use of the material in the manner complained of is not authorized by the copyright owner, its agent, or the law.
  6. A statement that the information in the notification is accurate, and under penalty of perjury, that the complaining party is authorized to act on behalf of the owner of an exclusive right that is allegedly infringed.

Other Intellectual Property Infringement

If you believe that any Content on the Site violates or infringes your intellectual property rights other than copyright claims referenced in the previous section, please send details of your allegation or complaint to the address in the above section. We will investigate the matter accordingly. These Terms of Use may be revised from time to time. You are bound by any such revisions, and you should periodically review this page to monitor such revisions.

This Site is owned and operated by Exelon. The Terms of Use, as well as your use of this site, shall be governed and construed in accord with the law of the Commonwealth of Pennsylvania or the State of Illinois (at Exelon's option), excluding conflict of law rules. You agree that any and all disputes regarding the Site or arising out of your use of this Site shall be resolved exclusively by a state or federal court in Philadelphia, Pennsylvania, or in Chicago, Illinois (at Exelon's option) and you also agree to submit to the jurisdiction of any such court for the purpose of resolving any such dispute. If a court determines that any provision of these Terms of Use is illegal or unenforceable, then such term will be modified to conform to law and the remaining provisions will remain in full force and effect.

ALL SITE CONTENT IS PROVIDED "AS IS," WITHOUT WARRANTIES OF ANY KIND EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND THAT IT WILL NOT INFRINGE THE RIGHTS OF OTHERS. EXELON MAKES NO WARRANTIES OR REPRESENTATION WITH RESPECT TO ERRORS OR OMISSIONS THAT MAY BE CONTAINED IN THE SITE CONTENT, THE ACCURACY OF THE SITE CONTENT, OR THAT THE SITE CONTENT IS VIRUS-FREE. THE RISK OF USE OF THE SITE IS SOLELY UPON THE USER.

UNDER NO CIRCUMSTANCES WILL EXELON BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, PUNITIVE OR CONSEQUENTIAL DAMAGES OF ANY KIND WHATSOEVER (INCLUDING, WITHOUT LIMITATION, ANY DAMAGES FOR LOSS OF REVENUE; LOSS OF USE OF THE SITE, LOSS OF USE OR DAMAGE TO YOUR COMPUTER EQUIPMENT OR PROGRAMS, BUSINESS INTERRUPTION, LOSS OF USE OF DATA, PROGRAMS OR EQUIPMENT) ARISING OUT OF YOUR ACCESSING, BROWSING OR USING, OR YOUR INABILITY TO ACCESS, BROWSE OR USE, THIS SITE OR SITE CONTENT AND ANY RELATED SERVICE, MATERIALS AND PRODUCTS.

YOU ARE ADVISED THAT SOME JURISDICTIONS DO NOT PERMIT OR OTHERWISE RESTRICT OR LIMIT THE EXCLUSION OF IMPLIED WARRANTIES OR LIMITATION ON CONSEQUENTIAL DAMAGES, SO THAT THE ABOVE DISCLAIMERS, EXCLUSIONS OR LIMITATIONS MAY NOT APPLY TO YOU.

The Site Content does not include any offer to sell, nor any solicitation of an offer to buy, any securities. The financial information in the Site Content is not complete, and should not be used for any purpose as a complete, accurate or current. For complete information, see the current SEC filings of Exelon Corporation, Commonwealth Edison Company, PECO Energy Company and Exelon Generation Company, LLC.

Constellation Energy Terms of Use

These terms of use ("Terms of Use") apply to your use of this Web site of Constellation Energy Group, Inc. or one of its affiliates ("us" or "we"). Using this Web site indicates that you accept these Terms of Use, so please read it carefully before any use. If you do not accept these Terms of Use, then do not use this Web site. We reserve the right to amend these Terms of Use at any time at our sole discretion and without notice to you.

Use of Site

This Web site has been prepared primarily for the purpose of providing information about us. This Web site has been compiled and is maintained by us, but we make no representation as to the completeness or accuracy of the information it contains. In particular, you should be aware that this information may be incomplete, may contain errors, or may become out of date. We make no commitment, and disclaim any duty, to update any of the information contained in this Web site, including but not limited to information in any of our news releases filings with the Securities and Exchange Commission. We reserve the right to add, modify or delete any information contained in this Web site at any time without notice to you.

Copyrights and Trademarks

We authorize you to view and download the materials in this Web site only for your personal and non- commercial use, provided that you retain all copyright, trademark and other proprietary notices contained in the original materials on any copies you make of the materials. You may not modify the materials at this Web site in any way or reproduce or publicly display, distribute or otherwise use them for any public or commercial purpose. Any use of these materials on any other Web site or networked computer environment for any purpose is prohibited. The materials in this Web site are copyrighted and contain our trademarks, and any unauthorized use of any materials at this Web site may violate applicable copyright, trademark, and other laws. If you breach any of these Terms of Use, your authorization to use this Web site automatically terminates and you must immediately destroy any downloaded or printed materials.

Warranties

The information provided in this Web site and related communications are provided on an "As Is" basis for information purposes only.
WE PROVIDE NO WARRANTIES, EXPRESS OR IMPLIED OR STATUTORY, AND WE EXPRESSLY DISCLAIM ANY AND ALL WARRANTIES, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NON-INFRINGEMENT. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OF IMPLIED WARRANTIES, SO THE ABOVE EXCLUSION MAY NOT APPLY TO YOU.

Limitation on Liability

In no event will we be liable to any party for any indirect, incidental, special, punitive, exemplary or consequential damages for any use of this Web site, whether based in tort, negligence, contract, warranty or otherwise, including but not limited to your use or inability to use this Web site, the accuracy or completeness or reliability of information or materials provided, your reliance on information or materials provided, any other hypertext linked Web site, or any lost profits, business interruption, loss of programs or other data on your information handling system or otherwise, even if we are expressly advised of the possibility of such damages.

Third Party Web Sites

We make no representations whatsoever about any other third party Web site which you may access through hypertext links in this Web site. When you access any such third party Web site, you acknowledge and agree that it is independent from us, and that we have no control over the content of any such Web site. In addition, a link to such third party Web site does not mean that we endorse or accept any responsibility for the content, or the use, of such Web site. It is up to you to take precautions to ensure that whatever you select for your use is free of such items as viruses, worms, Trojan horses and other items of a destructive nature. Additionally, such Web sites may have cookies and collect personally identifiable data.

Forward Looking Statements

We make statements in this Web site that are considered forward looking statements within the meaning of the Securities Exchange Act of 1934. See section entitled "Forward Looking Statements" available in our latest 10-Q and 10-K, on file with the Securities and Exchange Commission and available online at www.sec.gov.

Contact Information
If you have any questions about this Policy, please contact:
Constellation Energy Group, Inc.
Attn: Webmaster
100 Constellation Way Baltimore, MD 21202
webmaster@constellation.com

Constellation Energy Linking Policy

We authorize you to view and download the materials in this Web site only for your personal and non-commercial use, provided that you retain all copyright, trademark and other proprietary notices contained in the original materials on any copies you make of the materials. You may not modify the materials at this Web site in any way or reproduce or publicly display, distribute or otherwise use them for any public or commercial purpose. Any use of these materials on any other Web site or networked computer environment for any purpose is prohibited. The materials in this Web site are copyrighted and contain our trademarks, and any unauthorized use of any materials at this Web site may violate applicable copyright, trademark, and other laws. If you breach any of these Terms of Use, your authorization to use this Web site automatically terminates and you must immediately destroy any downloaded or printed materials.

Please note that all content on our Web sites is protected under copyright law and you must observe all copyright laws. By linking to any page on our Web site, you hereby agree to be bound by all the terms and conditions as set forth below:

  1. You must link to the home page only. Links to other pages on our Web site are prohibited
  2. Links must only be text-based using the words "Constellation Energy" and www.constellationenergy.com, or "Baltimore Gas and Electric Company" and www.bge.com. You may not use these words, or any of our logos or other marks as a link or in any other way. By linking, you acknowledge and agree that all rights to these words and marks, including but not limited to all content appearing on our Web site and the design of our Web site, belong solely to us.
  3. Framing is not permitted under any circumstances. You may not create frames around our Web site or use any other technique that alters in any way the visual presentation or appearance of our Web site.
  4. You may not misrepresent your relationship with us or present false or misleading impressions about us. No links to our Web site may be used in a manner that implies or suggests that we approve or endorse you, your Web site or your goods and services, except as we may have agreed to separately with you in writing.
  5. We shall have no responsibility or liability for any content appearing on your Web site. You agree to indemnify us, defend us at your sole cost, and hold us harmless from and against any and all claims arising out of or based upon your Web site including your links.
  6. No link(s) may appear on any page on your Web site or within any context containing content or materials that may be interpreted as libelous, obscene, criminal, pornographic, or which infringes or otherwise violates, or advocates the infringement or other violation of, any third party rights.
  7. We may at any time, in our sole discretion, without cause, terminate your right to link to any pages on our Web site. In such event upon request, you agree to immediately remove all links to our Web site and to cease using any of our marks.
  8. We reserve the right to change this linking policy at any time, so it is your responsibility to periodically review this page for any changes.

Contact Information
If you have any questions about this Policy, please contact:
Constellation Energy Group, Inc.
Attn: Webmaster
100 Constellation Way
Baltimore, MD 21202
webmaster@constellation.com