SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2012

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Schedule of change to net WRAM and MCBA deferred balances

	Operating Revenues			Operating Costs			Income Before Income Taxes
Net WRAM and MCBA deferred balances as of December 31, 2011	$	12,864		$	10,492		$	2,372
Reversal of deferred amounts during 2012		(12,864	)		(10,492	)		(2,372	)
Deferred amounts added during 2012		882			719			163
Net WRAM and MCBA deferred balances as of December 31, 2012	$	882		$	719		$	163

Schedule of net undercollected WRAM and MCBA receivable balances

	2012		2011
Net short-term receivable	$	34,020	$	19,357
Net long-term receivable		12,051		30,268
Total receivable	$	46,071	$	49,625
Net short-term payable	$	371	$	543
Net long-term payable		119		145
Total payable	$	490	$	688

Schedule of activities in the allowance for doubtful accounts

	2012			2011			2010
Beginning Balance	$	669		$	804		$	847
Provision for uncollectible accounts		1,548			1,250			1,500
Net write off of uncollectible accounts		(1,503	)		(1,385	)		(1,543	)
Ending Balance	$	714		$	669		$	804

Schedule of depreciable plant and equipment

	2012		2011
Equipment	$	400,610	$	382,195
Transmission and distribution plant		1,351,158		1,287,010
Office buildings and other structures		151,597		138,364
Total	$	1,903,365	$	1,807,569

Schedule of estimated useful lives of depreciable plant and equipment

	Useful Lives
Equipment	5 to 50 years
Transmission and distribution plant	40 to 65 years
Office Buildings and other structures	50 years

Schedule of regulatory assets and liabilities

	2012		2011
Regulatory Assets
Pension and retiree group health	$	223,153	$	213,819
Income tax temporary differences		56,991		34,664
Other accrued benefits		40,362		31,453
Net WRAM and MCBA long-term accounts receivable		12,051		30,268
Asset retirement obligations, net		11,862		9,694
Total Regulatory Assets	$	344,419	$	319,898
Regulatory Liabilities
Future tax benefits due ratepayers	$	24,932	$	16,978
Conservation program		6,538		4,328
Pension balancing account		—		1,936
Other liabilities		4,250		4,795
Total Regulatory Liabilities	$	35,720	$	28,037

Schedule of dilutive effect of options

	2012		2011		2010
	(In thousands, except per share data)
Net income as reported and available to common stockholders	$	48,828	$	37,712	$	37,656
Weighted average common shares, basic		41,892		41,762		41,612
Dilutive common stock equivalents (treasury method)		—		10		26
Shares used for dilutive calculation		41,892		41,772		41,638
Earnings per share—basic	$	1.17	$	0.90	$	0.90
Earnings per share—diluted	$	1.17	$	0.90	$	0.90