Consolidated Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current Assets:
Cash	$ 0	$ 0
Receivables:
Trade, less allowance of $0 ($13 in 2015)	141,726	134,834
Affiliates	489	1,084
Advances to affiliate	811,693	64,608
Other	2,589	15,422
Transportation and exchange gas receivables	1,827	2,427
Inventories:
Gas in storage, at original cost	786	780
Gas available for customer nomination, at average cost	17,233	19,838
Materials and supplies, at lower of average cost or market	37,190	36,223
Regulatory assets	87,059	79,575
Other	13,305	15,297
Total current assets	1,113,897	370,088
Investments, at cost plus equity in undistributed earnings	42,403	45,078
Property, Plant and Equipment:
Natural gas transmission plant	11,996,454	10,863,944
Less-Accumulated depreciation and amortization	3,687,473	3,471,775
Total property, plant and equipment, net	8,308,981	7,392,169
Other Assets:
Regulatory assets	264,001	263,730
Other	102,198	73,814
Total other assets	366,199	337,544
Total assets	9,831,480	8,144,879
Payables:
Trade	211,829	194,081
Affiliates	29,455	38,243
Cash overdrafts	40,043	28,969
Transportation and exchange gas payables	1,571	1,355
Accrued liabilities:
Property and other taxes	13,594	12,661
Interest	49,900	19,894
Regulatory liabilities	9,120	3,536
Customer deposits	47,049	12,778
Customer advances	34,923	20,999
Asset retirement obligations	26,934	23,192
Other	16,177	16,170
Total current liabilities	480,595	371,878
Long-Term Debt	2,210,754	1,419,574
Other Long-Term Liabilities:
Asset retirement obligations	248,518	299,834
Regulatory liabilities	449,391	382,325
Advances for construction costs	283,028	97,790
Transportation prepayments	11,837	12,806
Other	6,088	4,819
Total other long-term liabilities	998,862	797,574
Contingent Liabilities and Commitments (Note 2)
Owner's Equity:
Member's capital	3,678,499	3,176,499
Retained earnings	2,462,760	2,379,385
Accumulated other comprehensive loss	10	(31)
Total owner's equity	6,141,269	5,555,853
Total liabilities and owner's equity	$ 9,831,480	$ 8,144,879