Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 7,559	$ 6,620
Receivables - customers, net	27,856	34,684
Receivables - affiliates	5,747	5,350
Other receivables, net	236	259
Money pool notes receivable	76,813	68,626
Materials, supplies and fuel	24,282	20,965
Deferred income tax assets, net, current	0	13,661
Regulatory assets, current	14,096	10,257
Other current assets	43,118	4,954
Total current assets	199,707	165,376
Investments	4,725	4,584
Property, plant and equipment	1,166,126	1,115,061
Less accumulated depreciation and amortization	(326,074)	(309,767)
Total property, plant and equipment, net	840,052	805,294
Other assets:
Regulatory assets, non-current	71,717	68,427
Other, non-current assets	3,292	11,708
Total other assets	75,009	80,135
TOTAL ASSETS	1,119,493	1,055,389
Current liabilities:
Accounts payable	21,297	30,543
Accounts payable - affiliates	30,032	19,242
Accrued liabilities	69,454	16,415
Regulatory liabilities, current	0	3,073
Total current liabilities	120,783	69,273
Long-term debt	342,756	342,752
Deferred credits and other liabilities:
Deferred income tax liabilities, net, non-current	188,961	193,042
Regulatory liabilities, non-current	51,583	51,916
Benefit plan liabilities	20,033	20,981
Other, non-current liabilities	3,398	2,631
Total deferred credits and other liabilities	$ 263,975	$ 268,570
Commitments and contingencies (Notes 4, 8, 9 and 11)
Stockholder's equity:
Common stock $1 par value; 50,000,000 shares authorized; 23,416,396 shares issued	$ 23,416	$ 23,416
Additional paid-in capital	39,575	39,575
Retained earnings	330,295	313,622
Accumulated other comprehensive loss	(1,307)	(1,819)
Total stockholder's equity	391,979	374,794
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY	$ 1,119,493	$ 1,055,389