CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 1,741	$ 1,349
Accounts receivable, net	51,508	57,674
Accounts receivable from affiliates	0	1,595
Accrued unbilled revenues	38,625	51,634
Inventories	26,647	21,475
Regulatory assets	26,846	14,866
Prepaid taxes	17,571	27,518
Deferred income taxes	7,120	14,953
Prepayments and other	3,520	5,056
Total current assets	173,578	196,120
Property, plant and equipment, net	1,587,443	1,442,779
Other assets
Regulatory assets	256,445	233,193
Other investments	3,663	3,650
Other	4,534	3,651
Total other assets	264,642	240,494
Total assets	2,025,663	1,879,393
Current liabilities
Current portion of long-term debt	1,195	107
Short-term debt	8,000	68,000
Notes payable to affiliates	500	470
Accounts payable	49,481	52,086
Accounts payable to affiliates	19,152	24,986
Dividends payable to parent	11,486	8,032
Regulatory liabilities	10,730	9,717
Taxes accrued	3,708	5,638
Environmental liabilities	25,893	28,785
Accrued interest	8,421	7,507
Other	9,859	9,376
Total current liabilities	148,425	214,704
Deferred credits and other liabilities
Deferred income taxes	329,768	305,139
Deferred investment tax credits	9,112	9,698
Regulatory liabilities	131,996	126,424
Environmental liabilities	81,439	79,703
Customer advances	16,914	16,008
Pension and employee benefit obligations	38,827	45,708
Other	9,225	9,237
Total deferred credits and other liabilities	617,281	591,917
Commitments and contingencies
Capitalization
Long-term debt	567,106	468,490
Common stock — 1,000,000 shares authorized of $100 par value; 933,000 shares outstanding at Sept. 30, 2014 and Dec. 31, 2013, respectively	93,300	93,300
Additional paid in capital	316,855	248,844
Retained earnings	283,000	262,499
Accumulated other comprehensive loss	(304)	(361)
Total common stockholder’s equity	692,851	604,282
Total liabilities and equity	$ 2,025,663	$ 1,879,393