Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Utility plant:
Electric plant in service	$ 3,838,875	$ 3,791,566
Less accumulated depreciation and amortization	(1,267,633)	(1,244,332)
Net plant in service	2,571,242	2,547,234
Construction work in progress	159,326	154,738
Nuclear fuel; includes fuel in process of $68,908 and $57,315, respectively	206,391	194,842
Less accumulated amortization	(86,081)	(75,602)
Net nuclear fuel	120,310	119,240
Net utility plant	2,850,878	2,821,212
Current assets:
Cash and cash equivalents	5,166	8,420
Accounts receivable, principally trade, net of allowance for doubtful accounts of $1,716 and $2,156, respectively	84,845	88,452
Inventories, at cost	48,934	47,216
Under-collection of fuel revenues	2,519	11,123
Prepayments and other	10,445	8,988
Total current assets	151,909	164,199
Deferred charges and other assets:
Decommissioning trust funds	265,857	255,708
Regulatory assets	115,557	118,861
Other	16,463	16,298
Total deferred charges and other assets	397,877	390,867
Total assets	3,400,664	3,376,278
Capitalization:
Common stock, stated value $1 per share, 100,000,000 shares authorized, 65,660,750 and 65,685,615 shares issued, and 169,430 and 137,017 restricted shares, respectively	65,830	65,823
Capital in excess of stated value	323,188	322,643
Retained earnings	1,098,189	1,114,561
Accumulated other comprehensive loss, net of tax	(3,184)	(7,116)
Total stockholders' equity subtotal before treasury stock	1,484,023	1,495,911
Treasury stock, 25,271,652 and 25,304,914 shares, respectively, at cost	(420,961)	(421,515)
Common stock equity	1,063,062	1,074,396
Long-term debt, net of current portion	1,195,630	1,195,513
Total capitalization	2,258,692	2,269,909
Current liabilities:
Current maturities of long-term debt	83,206	83,143
Short-term borrowings under the revolving credit facility	134,178	81,574
Accounts payable, principally trade	45,812	62,953
Taxes accrued	26,944	32,488
Interest accrued	19,384	13,287
Over-collection of fuel revenues	181	255
Other	30,357	29,709
Total current liabilities	340,062	303,409
Deferred credits and other liabilities:
Accumulated deferred income taxes	548,491	555,066
Accrued pension liability	90,469	92,768
Accrued post-retirement benefit liability	35,083	34,400
Asset retirement obligation	86,882	81,800
Regulatory liabilities	20,113	18,435
Other	20,872	20,491
Total deferred credits and other liabilities	801,910	802,960
Commitments and contingencies
Total capitalization and liabilities	$ 3,400,664	$ 3,376,278