Income Taxes (Tables)

3 Months Ended

9 Months Ended

Mar. 31, 2012

Sep. 30, 2011

Income Taxes Tables [Abstract]

Effective Income Tax Rate Reconciliation

For the Three Months Ended March 31, 2012		Exelon (a)		Generation (a)		ComEd		PECO		BGE (b)
U.S. Federal statutory rate		35.0	%	35.0	%	35.0	%	35.0	%	35.0	%
Increase (decrease) due to:
	State income taxes, net of Federal income tax benefit	(27.4)		1.2		5.9		3.4		4.4
	Qualified nuclear decommissioning trust fund income	16.0		14.7		0.0		0.0		0.0
	Domestic production activities deduction	(1.2)		(1.2)		0.0		0.0		0.0
	Tax exempt income	(0.4)		(0.4)		0.0		0.0		0.0
	Health Care Reform Legislation	0.2		0.0		0.4		0.0		0.0
	Amortization of investment tax credit	(0.8)		(0.5)		(0.3)		(0.3)		0.9
	Plant basis differences	(3.0)		0.0		0.0		(3.5)		2.7
	Production tax credits	(0.5)		(3.1)		0.0		0.0		0.0
	Fines & Penalties	13.3		11.9		0.0		0.0		0.0
	Merger Expenses	13.2		0.0		0.0		0.0		(8.5)
	Other	(0.3)		0.5		0.2		(0.1)		0.3
Effective income tax rate		44.1	%	58.1	%	41.2	%	34.5	%	34.8	%
For the Three Months Ended March 31, 2011		Exelon		Generation		ComEd		PECO		BGE (b)
U.S. Federal statutory rate		35.0	%	35.0	%	35.0	%	35.0	%	35.0	%
Increase (decrease) due to:
	State income taxes, net of Federal income tax benefit	5.5		6.1		7.3		(3.9)		4.6
	Qualified nuclear decommissioning trust fund income	2.3		3.2		—		—		—
	Domestic production activities deduction	(0.9)		(1.3)		—		—		—
	Tax exempt income	(0.1)		(0.1)		—		—		—
	Health Care Reform Legislation	—		—		—		—		(1.9)
	Amortization of investment tax credit	(0.2)		(0.2)		(0.4)		(0.3)		(0.2)
	Plant basis differences	—		—		—		(0.2)		(0.8)
	Production tax credits	(0.9)		(1.3)		—		—		—
	Other	(0.7)		(1.0)		0.1		0.2		—
Effective income tax rate		40.0	%	40.4	%	42.0	%	30.8	%	36.7	%

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(a) Exelon activity for the three months ended March 31, 2012 includes the results of Constellation and BGE for March 12, 2012 - March 31, 2012. Generation activity for the three months ended March 31, 2012 includes the results of Constellation for March 12, 2012 - March 31, 2012.

(b)BGE activity represents the activity for the three months ended March 31, 2012 and 2011. BGE recognized a loss before income taxes for the three months ended March 31, 2012. As a result, positive percentages represent an income tax benefit for BGE for the three months ended March 31, 2012.

(c)       Prior to the close of the merger, the Registrants recorded the applicable taxes on merger transaction costs assuming the merger would not be completed. Upon closing of the merger, the Registrants reversed such taxes for those merger transaction costs that were determined to be non tax-deductible upon successful completion of a merger.