CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 1,568	$ 1,403
Accounts receivable, net	60,880	63,200
Accrued unbilled revenues	45,197	60,008
Other Receivables	15,339	15,144
Inventories	13,798	17,758
Regulatory assets	22,933	23,113
Prepaid taxes	24,670	23,606
Prepayments and other	2,865	3,450
Total current assets	187,250	207,682
Property, plant and equipment, net	2,150,296	2,088,728
Other assets
Regulatory assets	279,753	282,217
Other investments	3,001	2,892
Other	81	201
Total other assets	282,835	285,310
Total assets	2,620,381	2,581,720
Current liabilities
Current portion of long-term debt	151,067	151,080
Short-term debt	30,000	11,000
Notes payable to affiliates	500	500
Accounts payable	44,930	58,365
Accounts payable to affiliates	25,859	29,628
Dividends payable to parent	16,463	15,481
Regulatory liabilities	41,243	20,712
Environmental liabilities	10,960	10,469
Accrued interest	8,226	8,025
Other	32,955	34,474
Total current liabilities	362,203	339,734
Deferred credits and other liabilities
Deferred income taxes	260,506	256,687
Deferred investment tax credits	7,252	7,514
Regulatory liabilities	391,151	386,807
Environmental liabilities	18,258	19,190
Customer advances	17,553	16,325
Pension and employee benefit obligations	40,899	50,027
Other	18,085	18,747
Total deferred credits and other liabilities	753,704	755,297
Commitments and contingencies
Capitalization
Long-term debt	610,161	610,100
Common stock — 1,000,000 shares authorized of $100 par value; 933,000 shares outstanding at June 30, 2018 and Dec. 31, 2017, respectively	93,300	93,300
Additional paid in capital	452,929	449,350
Retained earnings	348,107	334,008
Accumulated other comprehensive loss	(23)	(69)
Total common stockholder’s equity	894,313	876,589
Total liabilities and equity	$ 2,620,381	$ 2,581,720