UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

April 5, 2012

Date of Report (Date of earliest event reported)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Section 8 – Other Events

Item 8.01 Other Events.

As previously disclosed, on September 28, 2011, Exelon Generation Company, LLC (Generation), a wholly owned subsidiary of Exelon, entered into a Purchase Agreement, under which Generation agreed to purchase Antelope Valley Solar Ranch One, a 230-megawatt (MW) solar photovoltaic (PV) project under development in northern Los Angeles County, Calif., from First Solar, which developed and will build and operate the project. Construction has started, with the first portion of the site expected to come online in late 2012 and full operation planned for late 2013.

The U.S. Department of Energy’s Loan Programs Office finalized a loan guarantee of up to $646 million to support project financing for Antelope Valley Solar Ranch One. Advances under the loan are contingent on the satisfaction of various conditions. Finalization of the acquisition was contingent on initial funding of the loan. On April 5, 2012, AV Solar Ranch 1, LLC, the legal entity that owns the project, received the first loan advance, finalizing Generation’s ownership of the project.

Attached as Exhibit 99.1 to this Current Report on Form 8-K is Exelon’s press release announcing receipt of the first loan advance.

Section 9 – Financial Statements and Exhibits

Item 9.01. Financial Statements and Exhibits.

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This combined Form 8-K is being furnished separately by Exelon and Generation (Registrants). Information contained herein relating to any individual Registrant has been furnished by such Registrant on its own behalf. No Registrant makes any representation as to information relating to any other Registrant.

This Current Report includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks and uncertainties. The factors that could cause actual results to differ materially from these forward-looking statements include those discussed herein as well as those discussed in (1) Exelon’s 2011 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) Constellation Energy Group, Inc.’s 2011 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 (3) other factors discussed in filings with the Securities and Exchange Commission by the Registrants. Readers are cautioned not to place undue reliance on these forward-looking statements, which apply only as of the date of this Current Report. None of the Registrants undertakes any obligation to publicly release any revision to its forward-looking statements to reflect events or circumstances after the date of this Current Report.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, each Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

April 5, 2012

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