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

March 31, 2010

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

On March 31, 2010, PECO Energy Company (PECO) requested Pennsylvania Public Utility Commission (PAPUC) approval to increase electric and natural gas delivery rates beginning January 1, 2011. The first electric delivery rate request since 1989 and only the second natural gas delivery rate request in 23 years, the increases will enable PECO to continue to meet customer demand and ensure the safe and reliable delivery of electricity and natural gas. PECO has requested annual increases of $316 million and $44 million to its annual electric and natural gas delivery revenues, respectively. The delivery charge, or the portion of the bill that covers PECO’s costs to deliver electricity and natural gas, represents about one third of a customer’s overall bill, and are expected to increase 6.94% and 5.28%, respectively, as a percentage of customer’s overall bill. Attached as Exhibit 99.1 and 99.2 to this Current Report on Form 8-K are PECO’s press release regarding its filings with the PAPUC and the slide presentation summarizing the details of the electric and natural gas distribution rate cases.

Section 9 – Financial Statements and Exhibits

(d) Exhibits.

* * * * *

This combined Form 8-K is being furnished separately by Exelon Corporation and PECO (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 2009 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; and (2) 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.

March 31, 2010

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