Item 5.04 Temporary Suspension of Trading Under Registrant's Employee Benefit Plans.

On February 11, 2009, Exelon Corporation (Exelon) received the notice required by section 101(i)(2)(E) of the Employment Retirement Income Security Act of 1974 with respect to a blackout period in connection with the transition of the plan administrator for its 401(k) employee savings plan. On February 18, 2009, Exelon distributed the required notice of the blackout period to its directors and executive officers. A copy of the notice is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No. Description
99.1 Blackout Period Notice

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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 2008 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 Exelon. Readers are cautioned not to place undue reliance on these forward-looking statements, which apply only as of the date of this Current Report. Exelon does not undertake any obligation to publicly release any revision to its forward-looking statements to reflect events or circumstances after the date of this Current Report.

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