Balance Sheet (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash	$ 0	$ 0
Receivables:
Trade	36,727	38,884
Affiliated companies	1,672	1,921
Advances to affiliate	0	137,666
Other	445	2,618
Materials and supplies	10,029	10,084
Exchange gas due from others	1,120	2,720
Prepayments and other	5,885	6,423
Total current assets	55,878	200,316
PROPERTY, PLANT AND EQUIPMENT, at cost	3,426,118	3,396,776
Less-Accumulated depreciation and amortization	1,554,172	1,508,245
Total property, plant and equipment, net	1,871,946	1,888,531
OTHER ASSETS:
Deferred charges	733	934
Regulatory assets	21,638	22,747
Total other assets	22,371	23,681
Total assets	1,950,195	2,112,528
Payables:
Trade	15,993	11,053
Affiliated companies	7,177	11,298
Advances from affiliate	90,069	0
Accrued liabilities:
Taxes, other than income taxes	12,886	11,617
Interest	3,005	3,677
Exchange gas due to others	3,423	4,500
Exchange gas offset	327	1,499
Customer advances	884	2,092
Other	3,229	6,655
Long-term debt due within one year	0	249,874
Total current liabilities	136,993	302,265
LONG-TERM DEBT	331,727	331,748
OTHER NONCURRENT LIABILITIES:
Asset retirement obligations	69,323	67,100
Regulatory liabilities	262,606	246,504
Other	1,749	1,730
Total other noncurrent liabilities	333,678	315,334
CONTINGENT LIABILITIES AND COMMITMENTS (Note 4)
MEMBER'S EQUITY:
Member's capital	1,073,892	1,073,892
Retained earnings	73,905	89,289
Total member's equity	1,147,797	1,163,181
Total liabilities and member's equity	$ 1,950,195	$ 2,112,528