Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Utility plant:
Electric plant in service	$ 3,893,461	$ 3,791,566
Less accumulated depreciation and amortization	(1,282,795)	(1,244,332)
Net plant in service	2,610,666	2,547,234
Construction work in progress	146,615	154,738
Nuclear fuel; includes fuel in process of $59,954 and $57,315, respectively	196,054	194,842
Less accumulated amortization	(74,566)	(75,602)
Net nuclear fuel	121,488	119,240
Net utility plant	2,878,769	2,821,212
Current assets:
Cash and cash equivalents	11,275	8,420
Accounts receivable, principally trade, net of allowance for doubtful accounts of $1,682 and $2,156, respectively	124,616	88,452
Inventories, at cost	50,929	47,216
Under-collection of fuel revenues	8,515	11,123
Prepayments and other	13,727	8,988
Total current assets	209,062	164,199
Deferred charges and other assets:
Decommissioning trust funds	271,315	255,708
Regulatory assets	115,245	118,861
Other	17,002	16,298
Total deferred charges and other assets	403,562	390,867
Total assets	3,491,393	3,376,278
Capitalization:
Common stock, stated value $1 per share, 100,000,000 shares authorized, 65,659,869 and 65,685,615 shares issued, and 169,565 and 137,017 restricted shares, respectively	65,829	65,823
Capital in excess of stated value	323,779	322,643
Retained earnings	1,120,664	1,114,561
Accumulated other comprehensive loss, net of tax	(4,133)	(7,116)
Total stockholders' equity subtotal before treasury stock	1,506,139	1,495,911
Treasury stock, 25,232,769 and 25,304,914 shares, respectively, at cost	(420,313)	(421,515)
Common stock equity	1,085,826	1,074,396
Long-term debt, net of current portion	1,195,748	1,195,513
Total capitalization	2,281,574	2,269,909
Current liabilities:
Current maturities of long-term debt	83,268	83,143
Short-term borrowings under the revolving credit facility	178,884	81,574
Accounts payable, principally trade	52,586	62,953
Taxes accrued	27,772	32,488
Interest accrued	13,373	13,287
Over-collection of fuel revenues	314	255
Other	33,239	29,709
Total current liabilities	389,436	303,409
Deferred credits and other liabilities:
Accumulated deferred income taxes	564,377	555,066
Accrued pension liability	87,460	92,768
Accrued post-retirement benefit liability	35,703	34,400
Asset retirement obligation	89,199	81,800
Regulatory liabilities	22,253	18,435
Other	21,391	20,491
Total deferred credits and other liabilities	820,383	802,960
Commitments and contingencies
Total capitalization and liabilities	$ 3,491,393	$ 3,376,278