BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 617	$ 834
Accounts receivable, net	84,008	71,166
Accounts receivable from affiliates	1,234	1,079
Accrued unbilled revenues	129,471	103,781
Inventories	31,657	37,546
Regulatory assets	30,656	31,541
Derivative instruments	6,596	12,952
Deferred income taxes	39,747	35,686
Prepaid taxes	16,573	35,666
Prepayments and other	8,436	20,520
Total current assets	348,995	350,771
Property, plant and equipment, net	4,520,672	4,348,823
Other assets
Regulatory assets	304,345	301,814
Derivative instruments	23,692	25,272
Other	4,997	3,449
Total other assets	333,034	330,535
Total assets	5,202,701	5,030,129
Current liabilities
Current portion of long-term debt	200,000	200,000
Short-term debt	25,000	15,000
Borrowings Payable Under Utility Money Pool Arrangement	100,000	0
Accounts payable	155,556	146,794
Accounts payable to affiliates	13,073	29,135
Regulatory liabilities	84,499	98,305
Taxes accrued	31,413	33,374
Accrued interest	17,666	17,781
Dividends payable	19,388	12,538
Derivative instruments	3,565	3,565
Other	31,262	35,654
Total current liabilities	681,422	592,146
Deferred credits and other liabilities
Deferred income taxes	953,522	896,430
Regulatory liabilities	235,479	229,584
Asset retirement obligations	27,949	27,233
Derivative instruments	25,296	27,078
Pension and employee benefit obligations	76,825	93,346
Other	20,272	17,841
Total deferred credits and other liabilities	1,339,343	1,291,512
Commitments and contingencies
Capitalization
Long-term debt	1,339,177	1,338,522
Common stock — 200 shares authorized of $1.00 par value; 100 shares outstanding at June 30, 2016 and Dec. 31, 2015, respectively	0	0
Additional paid in capital	1,396,223	1,371,223
Retained earnings	447,709	438,007
Accumulated other comprehensive loss	(1,173)	(1,281)
Total common stockholder’s equity	1,842,759	1,807,949
Total liabilities and equity	$ 5,202,701	$ 5,030,129