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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Summary of Significant Accounting Policies

Impact of the reclassifications to prior year (previously reported) amounts

Statement of Income for the Year Ended December, 2010	As previously reported			Reclassifications for discontinued operations			Amount reported after reclassification for discontinued operations
Operating Revenues
Other revenues	$	82,967		$	(74,446	)	$	8,521
Operating Expenses
Operations and maintenance	877,406			(7,221		)	870,185
Depreciation and amortization	414,555			(76		)	414,479
Taxes other than income taxes	135,334			(6		)	135,328
Other expenses	65,651			(58,142		)	7,509
Other
Other income	6,368			19			6,387
Other expense	(9,764		)	(157		)	(9,921		)
Interest Expense
Allowance for borrowed funds used during construction	(16,539		)	60			(16,479		)
Income Taxes	164,321			(3,452		)	160,869
Income From Continuing Operations	350,598			(5,747		)	344,851
Income From Discontinued Operations	19,611			5,747			25,358

Statement of Income for the Year Ended December, 2009	As previously reported			Reclassifications for discontinued operations			Amount reported after reclassification for discontinued operations
Operating Revenues
Other revenues	$	26,723		$	(22,254	)	$	4,469
Operating Expenses
Operations and maintenance	831,863			(9,563		)	822,300
Depreciation and amortization	407,463			(109		)	407,354
Taxes other than income taxes	123,277			(7		)	123,270
Other expenses	24,534			(18,550		)	5,984
Other
Other income	5,278			(119		)	5,159
Other expense	(14,269		)	(31		)	(14,300		)
Interest Expense
Interest charges	237,527			239			237,766
Allowance for borrowed funds used during construction	(10,430		)	51			(10,379		)
Income Taxes	136,506			2,045			138,551
Income From Continuing Operations	252,558			3,490			256,048
Income From Discontinued Operations	(179,794		)	(3,490		)	(183,284		)

Balance Sheets - December 31, 2010	As previously reported		Reclassifications for regulatory assets and liabilities			Amount reported after reclassification for regulatory assets and liabilities
Current Assets — Other regulatory assets	$	—	$	62,286		$	62,286
Current Assets — Deferred income taxes	94,602		30,295			124,897
Deferred Debits — Regulatory assets	1,048,656		(62,286		)	986,370
Current Liabilities — Deferred fuel and purchased power regulatory liability	—		58,442			58,442
Current Liabilities — Other regulatory liabilities	—		80,526			80,526
Deferred Credits and Other — Deferred income taxes	1,833,566		30,295			1,863,861
Deferred Credits and Other — Deferred fuel and purchased power regulatory liability	58,442		(58,442		)	—
Deferred Credits and Other — Regulatory liabilities	694,589		(80,526		)	614,063

Statement of Cash Flows for the Year Ended December 31, 2010	As previously reported			Reclassifications for regulatory assets and liabilities and to conform to current year presentation			Amounts reported after reclassification for regulatory assets and liabilities and to conform to current year presentation
Cash Flows from Operating Activities
Other current assets	$	5,246		$	4,129		$	9,375
Other current liabilities	5,204			(2,283		)	2,921
Change in other regulatory liabilities	54,518			2,283			56,801
Change in other long-term assets	(43,189		)	(4,751		)	(47,940		)
Expenditures for real estate investments	(622		)	622			—
Other changes in real estate assets	4,068			(4,068		)	—
Change in other long-term liabilities	(101,456		)	4,068			(97,388		)

Statement of Cash Flows for the Year Ended December 31, 2009	As previously reported			Reclassifications for regulatory assets and liabilities and to conform to current year presentation			Amounts reported after reclassification for regulatory assets and liabilities and to conform to current year presentation
Cash Flows from Operating Activities
Other current assets	$	24,647		$	13,759		$	38,406
Other current liabilities	29,274			28,006			57,280
Change in other regulatory liabilities	110,642			(27,992		)	82,650
Change in other long-term assets	(47,899		)	(16,730		)	(64,629		)
Change in other long-term liabilities	16,377			(4,216		)	12,161
Expenditures for real estate investments	(2,957		)	2,957			—
Other changes in real estate assets	(4,216		)	4,216			—

- Definition

Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made.

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