CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 3,777	$ 1,403
Accounts receivable, net	69,378	63,200
Accrued unbilled revenues	47,982	60,008
Other Receivables	15,256	15,144
Inventories	11,655	17,758
Regulatory assets	22,922	23,113
Prepaid taxes	17,768	23,606
Prepayments and other	3,262	3,450
Total current assets	192,000	207,682
Property, plant and equipment, net	2,116,095	2,088,728
Other assets
Regulatory assets	281,875	282,217
Other investments	3,089	2,892
Other	147	201
Total other assets	285,111	285,310
Total assets	2,593,206	2,581,720
Current liabilities
Current portion of long-term debt	151,074	151,080
Short-term debt	22,000	11,000
Notes payable to affiliates	500	500
Accounts payable	40,301	58,365
Accounts payable to affiliates	25,823	29,628
Dividends payable to parent	16,042	15,481
Regulatory liabilities	25,032	20,712
Environmental liabilities	12,386	10,469
Accrued interest	10,682	8,025
Other	29,239	34,474
Total current liabilities	333,079	339,734
Deferred credits and other liabilities
Deferred income taxes	258,599	256,687
Deferred investment tax credits	7,383	7,514
Regulatory liabilities	396,304	386,807
Environmental liabilities	20,378	19,190
Customer advances	16,448	16,325
Pension and employee benefit obligations	40,668	50,027
Other	18,322	18,747
Total deferred credits and other liabilities	758,102	755,297
Commitments and contingencies
Capitalization
Long-term debt	610,038	610,100
Common stock — 1,000,000 shares authorized of $100 par value; 933,000 shares outstanding at March 31, 2018 and Dec. 31, 2017, respectively	93,300	93,300
Additional paid in capital	449,350	449,350
Retained earnings	349,383	334,008
Accumulated other comprehensive loss	(46)	(69)
Total common stockholder’s equity	891,987	876,589
Total liabilities and equity	$ 2,593,206	$ 2,581,720