Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Utility plant:
Electric plant in service	$ 3,086,015	$ 3,076,549
Less accumulated depreciation and amortization	(1,219,479)	(1,214,088)
Net plant in service	1,866,536	1,862,461
Construction work in progress	304,619	282,647
Nuclear fuel; includes fuel in process of $39,681 and $48,492, respectively	200,454	188,185
Less accumulated amortization	(86,461)	(75,820)
Net nuclear fuel	113,993	112,365
Net utility plant	2,285,148	2,257,473
Current assets:
Cash and cash equivalents	13,392	25,592
Accounts receivable, principally trade, net of allowance for doubtful accounts of $1,828 and $2,261, respectively	58,750	65,350
Accumulated deferred income taxes	23,972	26,965
Inventories, at cost	45,300	45,942
Undercollection of fuel revenues	4,189	7,248
Prepayments and other	10,501	7,694
Total current assets	156,104	178,791
Deferred charges and other assets:
Decommissioning trust funds	217,509	214,095
Regulatory assets	96,603	101,050
Other	36,409	34,879
Total deferred charges and other assets	350,521	350,024
Total assets	2,791,773	2,786,288
Capitalization:
Common stock, stated value $1 per share, 100,000,000 shares authorized, 65,642,538 and 65,639,091 shares issued, and 154,144 and 120,534 restricted shares, respectively	65,797	65,760
Capital in excess of stated value	315,177	314,443
Retained earnings	979,604	985,665
Accumulated other comprehensive income, net of tax	13,059	2,612
Total stockholders equity subtotal before treasury stock	1,373,637	1,368,480
Treasury stock, 25,492,919 shares at cost	(424,647)	(424,647)
Common stock equity	948,990	943,833
Long-term debt	999,643	999,620
Total capitalization	1,948,633	1,943,453
Current liabilities:
Short-term borrowings under the revolving credit facility	45,951	14,352
Accounts payable, principally trade	46,597	61,795
Taxes accrued	22,107	25,206
Interest accrued	13,028	12,189
Overcollection of fuel revenues	0	1,048
Other	23,766	22,932
Total current liabilities	151,449	137,522
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes	455,535	449,925
Accrued pension liability	62,212	84,012
Accrued postretirement benefit liability	51,954	50,655
Asset retirement obligation	66,665	65,214
Regulatory liabilities	25,969	26,416
Other	29,356	29,091
Total deferred credits and other liabilities	691,691	705,313
Commitments and contingencies
Total capitalization and liabilities	$ 2,791,773	$ 2,786,288