CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 18,031	$ 1,285
Accounts receivable, net	53,289	60,396
Accrued unbilled revenues	39,931	53,567
Inventories	16,989	24,685
Regulatory assets	12,919	20,036
Prepaid taxes	24,653	28,628
Deferred income taxes	14,671	8,201
Prepayments and other	3,966	6,918
Total current assets	184,449	203,716
Property, plant and equipment, net	1,752,403	1,674,281
Other assets
Regulatory assets	277,021	280,693
Other investments	3,855	3,818
Other	5,248	4,612
Total other assets	286,124	289,123
Total assets	2,222,976	2,167,120
Current liabilities
Current portion of long-term debt	1,210	1,235
Short-term debt	0	78,000
Notes payable to affiliates	500	500
Accounts payable	32,597	61,530
Accounts payable to affiliates	28,260	26,524
Dividends payable to parent	11,993	14,957
Regulatory liabilities	9,561	16,940
Environmental liabilities	23,429	29,116
Other	22,170	19,923
Total current liabilities	129,720	248,725
Deferred credits and other liabilities
Deferred income taxes	376,867	348,180
Deferred investment tax credits	8,824	9,089
Regulatory liabilities	138,054	132,674
Environmental liabilities	85,281	78,620
Customer advances	18,213	17,623
Pension and employee benefit obligations	46,864	51,313
Other	16,004	16,151
Total deferred credits and other liabilities	$ 690,107	$ 653,650
Commitments and contingencies
Capitalization
Long-term debt	$ 666,313	$ 567,056
Common stock — 1,000,000 shares authorized of $100 par value; 933,000 shares outstanding at June 30, 2015 and Dec. 31, 2014, respectively	93,300	93,300
Additional paid in capital	351,914	322,276
Retained earnings	291,869	282,398
Accumulated other comprehensive loss	(247)	(285)
Total common stockholder’s equity	736,836	697,689
Total liabilities and equity	$ 2,222,976	$ 2,167,120