SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2011

CONSTELLATION ENERGY GROUP, INC. AND SUBSIDIARIES
AND
BALTIMORE GAS AND ELECTRIC COMPANY AND SUBSIDIARIES

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS

Column A	Column B			Column C						Column D			Column E

				Additions
Description	Balance at beginning of period			Charged to costs and expenses			Charged to Other Accounts— Describe			(Deductions)— Describe			Balance at end of period
	(In millions)
Reserves deducted in the Balance Sheet from the assets to which they apply:
Constellation Energy
Accumulated Provision for Uncollectibles
2011	$	172.9		$	84.5		$	(6.3	)(F)	$	(48.5	)(C)	$	202.6
2010		160.6			76.2			27.6	(B)		(91.5	)(C)		172.9
2009		240.6			71.2			(5.0	)(A)		(146.2	)(C)		160.6
Valuation Allowance
Net unrealized (gain) loss on available for sale securities
2011		(2.9	)		—			0.1	(D)		—			(2.8	)
2010		(2.8	)		—			(0.1	)(D)		—			(2.9	)
2009		2.1			(3.6	)		(1.3	)(D)		—			(2.8	)
Net unrealized (gain) loss on nuclear decommissioning trust funds
2011		—			—			—			—			—
2010		—			—			—			—			—
2009		(49.6	)		—			(201.0	)(D)		250.6	(E)		—
BGE
Accumulated Provision for Uncollectibles
2011		35.9			39.4			—			(37.6	)(C)		37.7
2010		47.2			45.6			—			(56.9	)(C)		35.9
2009		34.2			41.8			—			(28.8	)(C)		47.2

(A): Represents amounts recorded as an increase to nonregulated revenues resulting from a settlement with a counterparty that was in default.
(B): Represents amounts recorded as a reduction to nonregulated revenues resulting from liquidated damages claims upon termination of derivatives or other contracts which were determined to be uncollectible.
(C): Represents principally net amounts charged off as uncollectible.
(D): Represents amounts recorded in or reclassified from accumulated other comprehensive loss.
(E): Represents decrease due to the deconsolidation of CENG.
(F): Represents amounts recorded against revenue as part of the acquisition of MXenergy and StarTex.