CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 149,151	$ 1,403
Accounts receivable, net	51,424	63,200
Accrued unbilled revenues	44,667	60,008
Other Receivables	15,339	15,144
Inventories	18,385	17,758
Regulatory assets	23,110	23,113
Prepaid taxes	18,941	23,606
Prepayments and other	3,474	3,450
Total current assets	324,491	207,682
Property, plant and equipment, net	2,190,260	2,088,728
Other assets
Regulatory assets	285,587	282,217
Other investments	2,682	2,892
Other	278	201
Total other assets	288,547	285,310
Total assets	2,803,298	2,581,720
Current liabilities
Current portion of long-term debt	151,061	151,080
Short-term debt	0	11,000
Notes payable to affiliates	500	500
Accounts payable	49,663	58,365
Accounts payable to affiliates	25,761	29,628
Dividends payable to parent	18,169	15,481
Regulatory liabilities	22,218	20,712
Environmental liabilities	14,046	10,469
Accrued interest	11,239	8,025
Other	24,535	34,474
Total current liabilities	317,192	339,734
Deferred credits and other liabilities
Deferred income taxes	272,118	256,687
Deferred investment tax credits	7,122	7,514
Regulatory liabilities	398,578	386,807
Environmental liabilities	13,723	19,190
Customer advances	18,647	16,325
Pension and employee benefit obligations	42,483	50,027
Other	18,101	18,747
Total deferred credits and other liabilities	770,772	755,297
Commitments and contingencies
Capitalization
Long-term debt	807,828	610,100
Common stock — 1,000,000 shares authorized of $100 par value; 933,000 shares outstanding at Sept. 30, 2018 and Dec. 31, 2017, respectively	93,300	93,300
Additional paid in capital	453,260	449,350
Retained earnings	360,946	334,008
Accumulated other comprehensive loss	0	(69)
Total common stockholder’s equity	907,506	876,589
Total liabilities and equity	$ 2,803,298	$ 2,581,720