BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 601	$ 844
Accounts receivable, net	83,852	74,190
Accounts receivable from affiliates	3,575	949
Accrued unbilled revenues	136,086	119,418
Inventories	33,094	38,505
Regulatory assets	48,773	38,721
Derivative instruments	31,824	5,114
Prepaid taxes	16,968	21,779
Prepayments and other	5,638	7,855
Total current assets	360,411	307,375
Property, plant and equipment, net	4,871,791	4,695,819
Other assets
Regulatory assets	331,501	346,683
Derivative instruments	20,533	22,113
Other	7,701	7,477
Total other assets	359,735	376,273
Total assets	5,591,937	5,379,467
Current liabilities
Short-term debt	106,000	50,000
Borrowings under utility money pool arrangement	61,000	0
Accounts payable	180,738	176,157
Accounts payable to affiliates	16,361	14,414
Regulatory liabilities	69,170	41,577
Taxes accrued	37,789	39,742
Accrued interest	19,228	19,162
Dividends payable	25,014	30,870
Derivative instruments	3,565	3,565
Other	26,808	29,703
Total current liabilities	545,673	405,190
Deferred credits and other liabilities
Deferred income taxes	1,036,157	989,137
Regulatory liabilities	229,479	233,454
Asset retirement obligations	29,421	28,663
Derivative instruments	21,731	23,513
Pension and employee benefit obligations	86,006	107,872
Other	21,559	24,084
Total deferred credits and other liabilities	1,424,353	1,406,723
Commitments and contingencies
Capitalization
Long-term debt	1,636,478	1,635,858
Common stock — 200 shares authorized of $1.00 par value; 100 shares outstanding at June 30, 2017 and Dec. 31, 2016, respectively	0	0
Additional paid in capital	1,491,223	1,446,223
Retained earnings	495,451	486,763
Accumulated other comprehensive loss	(1,241)	(1,290)
Total common stockholder’s equity	1,985,433	1,931,696
Total liabilities and equity	$ 5,591,937	$ 5,379,467