The following tables provide additional information about the Registrants' Consolidated Statements of Operations for the years ended December 31, 2011, 2010 and 2009.

For the Year Ended December 31, 2011	Exelon		Generation			ComEd		PECO
Operating revenues (a)
Wholesale	$	7,717	$	8,837		$	0	$	32
Retail electric and gas		10,323		1,407	(b)		5,460		3,463
Other		884		64	(c)		596		225

Total operating revenues	$	18,924	$	10,308		$	6,056	$	3,720

For the Year Ended December 31, 2010	Exelon		Generation			ComEd		PECO
Operating revenues (a)
Wholesale	$	5,934	$	8,986		$	0	$	44
Retail electric and gas		11,906		1,004	(b)		5,648		5,262
Other		804		35	(c)		556		213

Total operating revenues	$	18,644	$	10,025		$	6,204	$	5,519

For the Year Ended December 31, 2009	Exelon		Generation			ComEd		PECO
Operating revenues (a)
Wholesale	$	5,469	$	8,905		$	0	$	26
Retail electric and gas		11,099		838	(b)		5,220		5,049
Other		750		(40)	(c)		554		236

Total operating revenues	$	17,318	$	9,703		$	5,774	$	5,311

(b) Generation's retail electric and gas operating revenues consist primarily of Exelon Energy Company, LLC. Generation's retail electric operating revenues are allocated among its reportable segments.

For the Year Ended December 31, 2011	Exelon		Generation		ComEd		PECO
Depreciation, amortization and accretion
Property, plant and equipment	$	1,284	$	570	$	502	$	191
Regulatory assets		51		0		40		11
Nuclear fuel(a)		755		755		0		0
ARO accretion(b)		214		214		0		0

Total depreciation, amortization and accretion	$	2,304	$	1,539	$	542	$	202

For the Year Ended December 31, 2010	Exelon		Generation		ComEd		PECO
Depreciation, amortization and accretion
Property, plant and equipment	$	1,144	$	474	$	473	$	171
Regulatory assets(c)		931		0		43		889
Nuclear fuel(a)		672		672		0		0
ARO accretion(b)		196		195		1		0

Total depreciation, amortization and accretion	$	2,943	$	1,341	$	517	$	1,060

For the Year Ended December 31, 2009	Exelon		Generation		ComEd		PECO
Depreciation, amortization and accretion
Property, plant and equipment	$	996	$	333	$	446	$	162
Regulatory assets(c)		838		0		48		790
Nuclear fuel(a)		558		558		0		0
ARO accretion(b)		209		207		1		0

Total depreciation, amortization and accretion	$	2,601	$	1,098	$	495	$	952

(a) Included in fuel expense on the Registrants' Consolidated Statements of Operations.

(b) Included in operating and maintenance expense on the Registrants' Consolidated Statements of Operations.

(a) Generation's utility tax represents gross receipts tax related to its retail operations and ComEd's and PECO's utility taxes represent municipal and state utility taxes and gross receipts taxes related to their operating revenues, respectively. The offsetting collection of utility taxes from customers is recorded in revenues on the Registrants' Consolidated Statements of Operations.

For the Year Ended December 31, 2009	Exelon		Generation		ComEd		PECO
Loss in equity method investments
Financing trusts	$	(24)	$	0	$	0	$	(24)
NuStart Energy Development, LLC		(3)		(3)		0		0

Total loss in equity method investments	$	(27)	$	(3)	$	-	$	(24)

For the Year Ended December 31, 2011			Exelon		Generation		ComEd		PECO
Other, Net
Decommissioning-related activities:
	Net realized income on decommissioning trust funds (a) —
		Regulatory Agreement Units	$	177	$	177	$	0	$	0
		Non-Regulatory Agreement Units		45		45		0		0
	Net unrealized losses on decommissioning trust funds —
		Regulatory Agreement Units		(74)		(74)		0		0
		Non-Regulatory Agreement Units		(4)		(4)		0		0
	Net unrealized gains on pledged assets —
		Zion Station decommissioning		48		48		0		0
	Regulatory offset to decommissioning trust fund-related
		activities(b)		(130)		(130)		0		0
Total decommissioning-related activities				62		62		0		0
Investment income				10		1		1		3
Long-term lease income				28		0		0		0
Interest income related to uncertain income tax positions				53		31		14		1
AFUDC - Equity				17		0		8		9
Bargain purchase gain related to Wolf Hollow acquisition				36		36		0		0
Other				(7)		(8)		6		1

Other, net			$	199	$	122	$	29	$	14

For the Year Ended December 31, 2010			Exelon		Generation		ComEd		PECO
Other, Net
Decommissioning-related activities:
	Net realized income on decommissioning trust funds (a) —
		Regulatory Agreement Units	$	176	$	176	$	0	$	0
		Non-Regulatory Agreement Units		51		51		0		0
	Net unrealized gains on decommissioning trust funds —
		Regulatory Agreement Units		316		316		0		0
		Non-Regulatory Agreement Units		104		104		0		0
	Regulatory offset to decommissioning trust fund-related activities(b)			(394)		(394)		0		0
Total decommissioning-related activities				253		253		0		0
Investment income				1		0		0		1
Long-term lease income				27		0		0		0
Interest income related to uncertain income tax positions				0		0		6		0
AFUDC - Equity				11		0		4		7
Realized gains on Rabbi trust investments				1		0		1		0
Other				19		4		13		0

Other, net			$	312	$	257	$	24	$	8

For the Year Ended December 31, 2009			Exelon		Generation		ComEd		PECO
Other, Net
Decommissioning-related activities:
	Net realized income on decommissioning trust funds (a) —
		Regulatory Agreement Units	$	126	$	126	$	0	$	0
		Non-Regulatory Agreement Units		29		29		0		0
	Net unrealized gains on decommissioning trust funds —
		Regulatory Agreement Units		801		801		0		0
		Non-Regulatory Agreement Units		227		227		0		0
	Regulatory offset to decommissioning trust fund-related
		activities(b)		(746)		(746)		0		0
Total decommissioning-related activities				437		437		0		0
Investment income				5		0		1		4
Long-term lease income				26		0		0		0
Interest income related to uncertain income tax positions (c)				50		0		65		5
AFUDC - Equity				9		0		5		4
Realized gain on Rabbi trust investments				5		0		5		0
Other-than-temporary impairment to Rabbi trust investments (d)				(7)		0		(7)		0
Losses on early retirement of debt				(117)		(71)		0		0
Other				19		10		10		0

Other, net			$	427	$	376	$	79	$	13

(a) Includes investment income and realized gains and losses on sales of investments of the trust funds.

(b) Includes the elimination of NDT fund activity for the Regulatory Agreement Units, including the elimination of net income taxes related to all NDT fund activity for those units. See Note 12 - Asset Retirement Obligations for additional information regarding the accounting for nuclear decommissioning.

(c) Primarily includes interest income at ComEd from the 2009 re-measurement of income tax uncertainties. See Note 11 - Income Taxes for additional information.

(d) ComEd recorded an other-than-temporary impairment to Rabbi trust investments during 2009.

The following tables provide additional information regarding the Registrants' Consolidated Statements of Cash Flows for the years ended December 31, 2011, 2010 and 2009.

For the Year Ended December 31, 2011	Exelon		Generation		ComEd		PECO

Cash paid (refunded) during the year:
Interest (net of amount capitalized)	$	649	$	158	$	296	$	128
Income taxes (net of refunds)		(457)		347		(676)		(65)

Other non-cash operating activities:
Pension and non-pension postretirement benefit costs	$	542	$	249	$	213	$	32
Provision for uncollectible accounts		121		0		57		64
Stock-based compensation costs		67		0		0		0
Other decommissioning-related activity (a)		16		16		0		0
Energy-related options (b)		137		137		0		0
Amortization of regulatory asset related to debt costs		21		0		18		3
Uncollectible accounts recovery, net		14		0		14		0
Discrete impacts from 2010 Rate Case order (c)		(32)		0		(32)		0
Bargain purchase gain related to Wolf Hollow Acquisition		(36)		(36)		0		0
Discrete impacts from Energy Infrastructure
Modernization Act (EIMA) (d)		(82)		0		(82)		0
Other		14		55		8		1

Total other non-cash operating activities	$	782	$	421	$	196	$	100

Changes in other assets and liabilities:
Under/over-recovered energy and transmission costs	$	(45)	$	0	$	(49)	$	4
Other current assets		(101)		(23)		(14)		(15)
Other noncurrent assets and liabilities		126		(34)		108		25

Total changes in other assets and liabilities	$	(20)	$	(57)	$	45	$	14

(a) Includes the elimination of NDT fund activity for the Regulatory Agreement Units, including the elimination of operating revenues, ARO accretion, ARC amortization, investment income and income taxes related to all NDT fund activity for these units. See Note 12 - Asset Retirement Obligations for additional information regarding the accounting for nuclear decommissioning.

(b) Includes amounts reclassified to realized at settlement of contracts recorded to results of operations related to option premiums due to the settlement of underlying transactions.

(c) In May 2011, as a result of the 2010 Rate Case order, ComEd recorded one-time benefits to reestablish previously expensed plant balances and to recover previously incurred costs related to Exelon's 2009 restructuring plan. See Note 2 - Regulatory Matters for more information.

(d) Includes the establishment of a regulatory asset, pursuant to EIMA, for the 2011 annual reconciliation in ComEd's distribution formula rate tariff and the deferral of costs associated with significant 2011 storms, partially offset by an accrual to fund a new Science and Technology Innovation Trust. See Note 2 - Regulatory Matters for more information.

(e) Includes $120 million of capital expenditures not paid as of December 31, 2011 related to Antelope Valley.

For the Year Ended December 31, 2010	Exelon			Generation		ComEd			PECO

Cash paid (refunded) during the year:
Interest (net of amount capitalized)	$	665	(a)	$	145	$	283		$	168
Income taxes (net of refunds)		1,219			732		15			433

Other non-cash operating activities:
Pension and non-pension postretirement benefit costs	$	581		$	268	$	215		$	46
Provision for uncollectible accounts		108			1		48			59
Provision for obsolete inventory		12			12		0			0
Stock-based compensation costs		44			0		0			0
Other decommissioning-related activity (b)		(91)			(91)		0			0
Energy-related options (c)		(73)			(73)		0			0
ARO adjustment		(19)			(8)		(10)			(1)
Amortization of regulatory asset related to debt costs		24			0		20			4
Accrual for Illinois utility distribution tax refund (d)		(25)			0		(25)			0
Under-recovered uncollectible accounts, net (e)		(14)			0		(14)			0
ARP SO2 allowances impairment		57			57		0			0
Other		5			16		4			0

Total other non-cash operating activities	$	609		$	182	$	238		$	108

Changes in other assets and liabilities:
Under/over-recovered energy and transmission costs	$	61		$	0	$	58		$	3
Other current assets		(18)			(16)		12			(19)
Other noncurrent assets and liabilities		(99)			(29)		(203)	(f)		94

Total changes in other assets and liabilities	$	(56)		$	(45)	$	(133)		$	78

(a) Excludes $167 million of interest paid to the IRS relating to a preliminary agreement reached during the third quarter of 2010. See Note 11 - Income Taxes for addition information.

(b) Includes the elimination of NDT fund activity for the Regulatory Agreement Units, including the elimination of operating revenues, ARO accretion, ARC amortization, investment income and income taxes related to all NDT fund activity for these units. See Note 12 - Asset Retirement Obligations for additional information regarding the accounting for nuclear decommissioning.

(c) Includes amounts reclassified to realized at settlement of contracts recorded to results of operations related to option premiums due to the settlement of underlying transactions.

(d) During the second quarter of 2010, ComEd recorded a reduction of $25 million to taxes other than income to reflect management's estimate of future refunds for the 2008 and 2009 tax years associated with Illinois' utility distribution tax based on an analysis of past refunds and interpretations of the Illinois Public Utility Act. Historically, ComEd has recorded refunds of the Illinois utility distribution tax when received. ComEd believes it now has sufficient, reliable evidence to record and support an estimated receivable associated with the anticipated refund for the 2008 and 2009 tax years.

(e) Includes $70 million of under-recovered uncollectible accounts expense from 2008 and 2009 recorded in the first quarter of 2010 as well as $59 million of amortization of the associated regulatory asset. This amount also includes a credit of $3 million of undercollections associated with 2010 activity. ComEd is recovering these costs through a rider mechanism authorized by the ICC. See Note 2 - Regulatory Matters for additional information regarding the Illinois legislation for recovery of uncollectible accounts.

(f) Relates primarily to a decrease in interest payable associated with a change in uncertain income tax positions. See Note 11 - Income Taxes for additional information.

(g) Represents contingent liability recorded in connection with the December 9, 2010 acquisition of Exelon Wind. See Note 3 - Acquisition for additional information.

For the Year Ended December 31, 2009		Exelon		Generation		ComEd			PECO

Cash paid (refunded) during the year:
Interest (net of amount capitalized)		$	647	$	69	$	284		$	179
Income taxes (net of refunds)			982		668		63			368

Other non-cash operating activities:
Pension and non-pension postretirement benefit costs		$	536	$	240	$	192		$	47
Loss in equity method investments			27		3		0			24
Provision for uncollectible accounts			149		2		85			63
Stock-based compensation costs			70		0		0			0
Other decommissioning-related activity (a)			(163)		(163)		0			0
Energy-related options (b)			46		46		0			0
ARO adjustment (c)			(47)		(47)
Amortization of regulatory liability related to debt costs			25		0		21			4
Amortization of the regulatory liability related to the PURTA
	tax settlement		(2)		0		0			(2)
Other-than-temporary impairment to Rabbi trust impairments (d)			7		0		7			0
Inventory write-down related to plant retirements			17		17		0			0
Other			(13)		6		4			5

Total other non-cash operating activities		$	652	$	104	$	309		$	141

Changes in other assets and liabilities:
Under/over-recovered energy and transmission costs		$	23	$	0	$	13		$	10
Other current assets			(2)		0		0			3
Other noncurrent assets and liabilities			(134)		(1)		(76)	(e)		(47)

Total changes in other assets and liabilities		$	(113)	$	(1)	$	(63)		$	(34)

(b) Includes amounts reclassified to realized at settlement of contracts recorded to results of operations related to option premiums due to the settlement of underlying transactions.

(c) Represents the reduction in the ARO in excess of the existing ARC balances for Generation's nuclear generating units that are not subject to regulatory agreement with respect to decommissioning trust funding (the former AmerGen units and the portions of the Peach Bottom units).

(d) ComEd recorded an other-than-temporary impairment to Rabbi trust investments during the second quarter of 2009. See Note 8 - Fair Value of Assets and Liabilities for additional information regarding the impairment.

(e) Relates primarily to a decrease in interest payable associated with the remeasurement of uncertain income tax positions. See Note 11 - Income Taxes for additional information.

DOE Smart Grid Investment Grant (Exelon and PECO). For the years ended December 31, 2011 and December 31, 2010, Exelon and PECO have included in the capital expenditures line item under investing activities of the cash flow statement capital expenditures of $51 million and $28 million, respectively, and reimbursements of $56 million in 2011 related to PECO's DOE SGIG. See Note 2 – Regulatory Matters for additional information regarding the accounting for the DOE SGIG.

The following tables provide additional information about assets and liabilities of the Registrants at December 31, 2011 and 2010.

December 31, 2011		Exelon		Generation		ComEd		PECO
Investments
Equity method investments:
	Financing trusts (a)	$	15	$	0	$	6	$	8
	Keystone Fuels, LLC		13		13		0		0
	Conemaugh Fuels, LLC		16		16		0		0
	Sacramento Solar		1		1		0		0

	Total equity method investments		45		30		6		8

Other investments:
	Net investment in direct financing leases		656		0		0		0
	Employee benefit trusts and investments (b)		65		11		21		22

Total investments		$	766	$	41	$	27	$	30

December 31, 2010		Exelon		Generation		ComEd		PECO
Investments
Equity method investments:
	Financing trusts (a)	$	15	$	0	$	6	$	8
	Keystone Fuels, LLC		10		10		0		0
	Conemaugh Fuels, LLC		13		13		0		0
	NuStart Energy Development, LLC		1		1		0		0

	Total equity method investments		39		24		6		8

Other investments:
	Net investment in direct financing leases		629		0		0		0
	Employee benefit trusts and investments (b)		64		11		23		20

Total investments		$	732	$	35	$	29	$	28

(a) Includes investments in financing trusts, which were not consolidated within the financial statements of Exelon. See Note 1 - Significant Accounting Policies for additional information.

(b) The Registrants' investments in these marketable securities are recorded at fair market value.

December 2010 IRS Payment (Exelon). In the third quarter of 2010, Exelon and IRS Appeals reached a nonbinding, preliminary agreement to settle Exelon's involuntary conversion and CTC positions. In order to stop additional interest from accruing on the expected assessment resulting from the agreement, Exelon paid $302 million to the IRS on December 28, 2010. As of December 31, 2010, Exelon had not funded the specific bank account from which the IRS payment was disbursed resulting in a current liability. This amount was subsequently funded in January 2011. Under the authoritative guidance for offsetting balances, Exelon included this payment in Cash and cash equivalents with an offsetting amount in Other current liabilities on its Consolidated Balance Sheets. See Note 11 - Income Taxes for additional information.

Like-Kind Exchange Transaction (Exelon). Prior to the PECO/Unicom Merger in October 2000, UII, LLC (formerly Unicom Investments, Inc.) (UII), a wholly owned subsidiary of Exelon, entered into a like-kind exchange transaction pursuant to which approximately $1.6 billion was invested in passive generating station leases with two separate entities unrelated to Exelon. The generating stations were leased back to such entities as part of the transaction. For financial accounting purposes, the investments are accounted for as direct financing lease investments. UII holds the leasehold interests in the generating stations in several separate bankruptcy remote, special purpose companies it directly or indirectly wholly owns. The lease agreements provide the lessees with fixed purchase options at the end of the lease terms. If the lessees do not exercise the fixed purchase options, Exelon has the ability to require the lessees to return the leasehold interests or to arrange a service contract with a third party for a period following the lease term. If Exelon chooses the service contract option, the leasehold interests will be returned to Exelon at the end of the term of the service contract. In any event, Exelon will be subject to residual value risk if the lessees do not exercise the fixed purchase options. In the fourth quarter of 2000, under the terms of the lease agreements, UII received a prepayment of $1.2 billion for all rent, which reduced the investment in the leases. There are no minimum scheduled lease payments to be received over the remaining term of the leases. At December 31, 2011 and 2010, the components of the net investment in long-term leases were as follows:

The following tables provide additional information about liabilities of the Registrants at December 31, 2011 and 2010.

December 31, 2011		Exelon			Generation			ComEd		PECO
Accrued expenses
Compensation-related accruals (a)		$	520		$	264		$	127	$	48
Taxes accrued			297			241			59		5
Interest accrued			192			56			124		27
Severance accrued			15			9			2		1
Other accrued expenses			231	(b)		209	(b)		6		2

Total accrued expenses		$	1,255		$	779		$	318	$	83




December 31, 2010		Exelon			Generation			ComEd		PECO
Accrued expenses
Compensation-related accruals (a)		$	465		$	229		$	110	$	51
Taxes accrued			297			38			83		9
Interest accrued			195			76			154		30
Severance accrued			22			10			4		1
Other accrued expenses			61			38			15		4

Total accrued expenses		$	1,040		$	391		$	366	$	95


(a)	Primarily includes accrued payroll, bonuses and other incentives, vacation and benefits.
(b)	Includes $184 million for amounts accrued related to Antelope Valley.

The following tables provide information about accumulated OCI (loss) recorded (after tax) within Exelon's Consolidated Balance Sheets at December 31, 2011 and 2010:

December 31, 2011	Exelon		Generation		ComEd		PECO
Accumulated other comprehensive income (loss)
Net unrealized gain on cash flow hedges	$	488	$	915	$	0	$	0
Pension and non-pension postretirement benefit plans		(2,938)		0		0		0
Unrealized loss on marketable securities		0		0		(1)		0

Total accumulated other comprehensive income (loss)	$	(2,450)	$	915	$	(1)	$	0

December 31, 2010	Exelon		Generation		ComEd		PECO
Accumulated other comprehensive income (loss)
Net unrealized gain on cash flow hedges	$	400	$	1,013	$	0	$	0
Pension and non-pension postretirement benefit plans		(2,823)		0		0		0
Unrealized loss on marketable securities		0		0		(1)		0

Total accumulated other comprehensive income (loss)	$	(2,423)	$	1,013	$	(1)	$	0