Consolidated Balance Sheets (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Utility plant:
Electric plant in service	$ 2,758,648	$ 2,522,862
Less accumulated depreciation and amortization	(1,105,527)	(1,047,498)
Net plant in service	1,653,121	1,475,364
Construction work in progress	143,645	285,086
Nuclear fuel; includes fuel in process of $43,443 (at 2011) and $47,746 (at 2010), respectively	175,048	150,774
Less accumulated amortization	(61,140)	(45,471)
Net nuclear fuel	113,908	105,303
Net utility plant	1,910,674	1,865,753
Current assets:
Cash and cash equivalents	7,744	79,184
Accounts receivable, principally trade, net of allowance for doubtful accounts of $2,799 (at 2011) and $2,885 (at 2010), respectively	115,395	71,685
Accumulated deferred income taxes	10,777	25,818
Inventories, at cost	39,283	36,132
Income taxes receivable	6,252	12,656
Undercollection of fuel revenues	12,275	0
Prepayments and other	7,975	4,543
Total current assets	199,701	230,018
Deferred charges and other assets:
Decommissioning trust funds	158,437	153,878
Regulatory assets	88,894	88,557
Other	27,743	26,560
Total deferred charges and other assets	275,074	268,995
Total assets	2,385,449	2,364,766
Capitalization:
Common stock, stated value $1 per share, 100,000,000 shares authorized, 65,264,664 (at 2011) and 65,121,689 (at 2010) shares issued, and 196,954 (at 2011) and 143,371 (at 2010) restricted shares, respectively	65,462	65,265
Capital in excess of stated value	308,138	305,068
Retained earnings	890,529	810,858
Accumulated other comprehensive income (loss), net of tax	(35,864)	(33,177)
Total stockholders equity subtotal before treasury stock	1,228,265	1,148,014
Treasury stock, 25,212,530 (at 2011) and 22,693,995 (at 2010) shares, respectively, at cost	(415,413)	(337,639)
Common stock equity	812,852	810,375
Long-term debt	816,484	849,745
Total capitalization	1,629,336	1,660,120
Current liabilities:
Current maturities of long-term debt	33,300	0
Short-term borrowings under the revolving credit facility	17,793	4,704
Accounts payable, principally trade	49,653	41,795
Taxes accrued	36,033	29,172
Interest accrued	13,177	12,099
Overcollection of fuel revenues	1,643	18,976
Other	35,419	24,207
Total current liabilities	187,018	130,953
Deferred credits and other liabilities:
Accumulated deferred income taxes	321,247	286,730
Accrued pension liability	85,149	93,471
Asset retirement obligation	54,944	92,911
Accrued postretirement benefit liability	64,357	61,594
Regulatory liabilities	15,283	14,489
Other	28,115	24,498
Total deferred credits and other liabilities	569,095	573,693
Commitments and contingencies
Total capitalization and liabilities	$ 2,385,449	$ 2,364,766