CONSOLIDATED STATEMENTS OF CASH FLOWS (Constellation Energy Group, Inc. and Subsidiaries) (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash Flows From Operating Activities
Net income (loss)	$ 285.4	$ (1,099.9)
Adjustments to reconcile to net cash provided by (used in) operating activities
Depreciation, depletion, accretion, and amortization	449.6	380.6
Amortization of energy contracts and derivatives designated as hedges	316.7	198.9
All other amortization	28.0	23.4
Deferred income taxes	140.8	(989.0)
Investment tax credit adjustments	(3.2)	(3.4)
Deferred fuel costs	20.0	69.2
Deferred storm costs	(15.5)
Defined benefit obligation expense	62.1	51.2
Defined benefit obligation payments	(30.9)	(61.0)
Impairment losses and other costs		2,468.4
Gain on divestitures	(23.0)	(43.5)
Equity in earnings of affiliates less than dividends received	5.0	30.3
Derivative contracts classified as financing activities	(7.4)	128.9
Changes in:
Accounts receivable, excluding margin	(98.5)	(75.2)
Derivative assets and liabilities, excluding collateral	450.3	251.4
Net collateral and margin	(28.5)	(201.5)
Materials, supplies, and fuel stocks	10.8	39.8
Other current assets	80.5	(64.8)
Accounts payable	(207.7)	(21.1)
Liability for unrecognized tax benefits	(42.9)	(31.1)
Accrued taxes and other current liabilities	2.1	(1,110.7)
Other	(40.5)	38.5
Net cash provided by (used in) operating activities	1,353.2	(20.6)
Cash Flows From Investing Activities
Investments in property, plant and equipment	(851.4)	(752.2)
Asset and business acquisitions, net of cash acquired	(1,443.2)	(372.9)
Proceeds from U.S. Department of Energy grant	40.6	42.7
Proceeds from sales of investments and other assets	6.6	93.8
Proceeds from investment tax credits and grants related to renewable energy investments	58.9	40.0
Payment for issuance of loans receivable	(30.0)
Contract and portfolio acquisitions	(3.7)	(208.8)
Decrease (increase) in restricted funds	30.9	(79.0)
Other	(4.5)	(31.1)
Net cash used in investing activities	(2,195.8)	(1,267.5)
Cash Flows From Financing Activities
Net issuance (repayment) of short-term borrowings	128.1	(9.0)
Proceeds from issuance of common stock	15.7	11.4
Proceeds from issuance of long-term debt	235.1
Repayment of long-term debt	(253.2)	(632.1)
Debt and credit facility costs	(3.2)	(0.7)
Common stock dividends paid	(136.3)	(138.8)
BGE preference stock dividends paid	(9.9)	(9.9)
Proceeds from contract and portfolio acquisitions	1.0	52.5
Derivative contracts classified as financing activities	7.4	(128.9)
Other	0.4	(1.2)
Net cash used in financing activities	(14.9)	(856.7)
Net Decrease in Cash and Cash Equivalents	(857.5)	(2,144.8)
Cash and Cash Equivalents at Beginning of Period	2,028.5	3,440.0
Cash and Cash Equivalents at End of Period	$ 1,171.0	$ 1,295.2