May 21, 2012

1

Presentation for

The City of Evanston

Exelon Corporation: A National Energy Leader • Operations in 47 states & Washington, DC

• Revenues: $32.7 billion (2011)

• Assets: $74.5 billion (2011)

• Employees: 27,000 (2011)

• Load Served: ~ 164 TWH (electric) and 382 BCF (natural gas) (2011)

• Energy Generation–No. 1 competitive power generator in the nation –Generating Capacity: ~34,650 MW (2011)

• Competitive Energy Sales: Constellation–~ 100,000 business & public sector customers–~1 million residential customers.

• Transmission & Distribution–BGE, ComEd & PECO–6.6 million electric customers–1.2 million natural gas customers

• NYSE Ticker symbol: EXC

• Headquartered in Chicago, IL

© 2012. Constellation Energy Resources LLC. The materials provided and any offerings described herein are those of Constellation NewEnergy, Inc., a subsidiary of Exelon Corporation. Brand names and product names are trademarks or service marks of their respective holders. All rights reserved. Errors and omissions excepted.

The leading U.S. competitive energy provider, with one of the cleanest and lowest-cost power generation fleets and largest retail customer bases in the country.

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Electric Aggregation Program – Next Steps

1. Opt-out letter will be mailed to all eligible participants on or about Friday, May 25, 2012

2. Per the Plan of Operations and Governance, the Opt-Out period will last for 21 days

– During this time, residents who do not wish to participate in the GA program can opt-out

– If you have ANY questions about the program, you may call our Customer Care Team on the dedicated phone number that is listed on your letter (1-800-718-1493)

3. Assuming a 5/25 postmark, the Opt-Out period will end on 6/22 (counting business days only)

4. Constellation and Evanston will communicate the final list to ComEd

5. ComEd will confirm the final list and process enrollments

– This process may take up to 10 business days

6. Power Flow will commence in either July or August depending on your meter read schedule

3© 2012. Constellation Energy Resources LLC. The materials provided and any offerings described herein are those of Constellation NewEnergy, Inc., a subsidiary of Exelon Corporation. Brand names and product names are trademarks or service marks of their respective holders. All rights reserved. Errors and omissions excepted.

Electric Aggregation Program – How to Opt-Out

Four methods to Opt-Out

1. Mail: Return the form below in the pre-addressed stamped envelope.

2. Fax: Fax the Opt-Out form below to 1-866-422-6233.

3. Phone: Call Constellation Energy at 1-800-718-1493.

4. Web: Visit home.constellation.com/optout.

4© 2012. Constellation Energy Resources LLC. The materials provided and any offerings described herein are those of Constellation NewEnergy, Inc., a subsidiary of Exelon Corporation. Brand names and product names are trademarks or service marks of their respective holders. All rights reserved. Errors and omissions excepted.

Green / Renewable Product Offering

The City of Evanston’s contract includes the use of 100% renewable energy

• In theory, renewable generation displaces fossil fuel generation• By buying RECs you are supporting demand for clean energy

© 2012. Constellation Energy Resources LLC. The materials provided and any offerings described herein are those of Constellation NewEnergy, Inc., a subsidiary of Exelon Corporation. Brand names and product names are trademarks or service marks of their respective holders. All rights reserved. Errors and omissions excepted. 5

• The fixed price includes the cost of REC’s sourced from “Illinois or adjoining state wind” assets

• They meet all of the technological criteria of Green-e• They are newly constructed and were built after 1997 • They are compliant with IL RPS and IPA standards

Opt-Out Letter

© 2012. Constellation Energy Resources LLC. The materials provided and any offerings described herein are those of Constellation NewEnergy, Inc., a subsidiary of Exelon Corporation. Brand names and product names are trademarks or service marks of their respective holders. All rights reserved. Errors and omissions excepted. 6

Opt-Out Form and Envelope

© 2012. Constellation Energy Resources LLC. The materials provided and any offerings described herein are those of Constellation NewEnergy, Inc., a subsidiary of Exelon Corporation. Brand names and product names are trademarks or service marks of their respective holders. All rights reserved. Errors and omissions excepted. 7