Consolidated Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current Assets:
Cash	$ 0	$ 173
Receivables:
Trade, less allowance of $13 ($0 in 2014)	134,834	127,141
Affiliates	1,084	654
Advances to affiliate	64,608	306,910
Other	15,422	3,594
Transportation and exchange gas receivables	2,427	3,485
Inventories:
Gas in storage, at original cost	780	715
Gas in storage, LIFO	0	497
Gas available for customer nomination, at average cost	19,838	28,464
Material and supplies, at lower of average cost or market	36,223	37,023
Regulatory assets	79,575	77,810
Other	15,297	14,683
Total current assets	370,088	601,149
Investments, at cost plus equity in undistributed earnings	45,078	47,050
Property, Plant and Equipment:
Natural gas transmission plant	10,863,944	9,645,382
Less-Accumulated depreciation and amortization	3,471,775	3,257,844
Total property, plant and equipment, net	7,392,169	6,387,538
Other Assets:
Regulatory assets	263,730	239,080
Other	73,814	65,263
Total other assets	337,544	304,343
Total assets	8,144,879	7,340,080
Payables:
Trade	194,081	237,873
Affiliates	38,243	37,688
Cash overdrafts	28,969	30,867
Transportation and exchange gas payables	1,355	4,701
Accrued liabilities:
Property and other taxes	12,661	13,723
Interest	19,894	19,894
Regulatory liabilities	3,536	7,054
Customer advances	20,999	9,205
Asset retirement obligations	23,192	16,444
Other	28,948	37,785
Total current liabilities	371,878	415,234
Long-Term Debt	1,419,574	1,418,692
Other Long-Term Liabilities:
Asset retirement obligations	299,834	280,031
Regulatory liabilities	382,325	326,083
Advances for construction costs	97,790	30,456
Transportation prepayments	12,806	0
Other	4,819	5,272
Total other long-term liabilities	$ 797,574	$ 641,842
Contingent Liabilities and Commitments (Note 2)
Owner's Equity:
Member's capital	$ 3,176,499	$ 2,524,499
Retained earnings	2,379,385	2,339,928
Accumulated other comprehensive loss	(31)	(115)
Total owner's equity	5,555,853	4,864,312
Total liabilities and owner's equity	$ 8,144,879	$ 7,340,080