CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents		$ 1,546	$ 1,079
Accounts receivable, net	[1]	54,031	56,378
Accrued unbilled revenues		53,638	47,698
Inventories		18,309	21,559
Regulatory assets		18,162	16,146
Prepaid taxes		25,915	25,976
Prepayments and other		3,785	2,387
Total current assets		175,386	171,223
Property, plant and equipment, net		1,947,637	1,828,079
Other assets
Regulatory assets		286,188	289,196
Other investments		2,844	4,042
Other		785	67
Total other assets		289,817	293,305
Total assets		2,412,840	2,292,607
Current liabilities
Current portion of long-term debt		1,123	1,131
Short-term debt		60,000	10,000
Notes payable to affiliates		500	500
Accounts payable		41,068	34,317
Accounts payable to affiliates		29,037	24,538
Dividends payable to parent		10,729	15,322
Regulatory liabilities		17,428	11,781
Environmental liabilities		41,438	17,155
Accrued interest		8,012	7,945
Other		26,484	15,146
Total current liabilities		235,819	137,835
Deferred credits and other liabilities
Deferred Tax Liabilities, Net, Noncurrent		430,593	391,063
Deferred investment tax credits		8,037	8,560
Regulatory liabilities		148,189	141,289
Environmental liabilities		23,003	77,441
Customer advances		19,425	18,480
Pension and employee benefit obligations		55,164	49,889
Other		18,814	16,347
Total deferred credits and other liabilities		703,225	703,069
Commitments and contingencies
Capitalization
Long-term debt		661,946	661,318
Common stock — 1,000,000 shares authorized of $100 par value; 933,000 shares outstanding at Dec. 31, 2016 and 2015, respectively		93,300	93,300
Additional paid in capital		395,315	394,553
Retained earnings		323,368	302,741
Accumulated other comprehensive loss		(133)	(209)
Total common stockholder’s equity		811,850	790,385
Total liabilities and equity		$ 2,412,840	$ 2,292,607

[1] Accounts receivable, net includes an immaterial amount due from affiliates for 2016 and 2015, respectively.