Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash	$ 0	$ 0
Receivables:
Trade	38,884	42,702
Affiliated companies	1,921	1,321
Advances to affiliate	137,666	45,137
Other	2,618	598
Materials and supplies	10,084	10,106
Exchange gas due from others	2,720	3,869
Prepayments and other	6,423	5,740
Total current assets	200,316	109,473
PROPERTY, PLANT AND EQUIPMENT, at cost	3,396,776	3,319,516
Less-Accumulated depreciation	1,508,245	1,424,855
Total property, plant and equipment, net	1,888,531	1,894,661
OTHER ASSETS:
Deferred charges	934	2,122
Regulatory assets	22,747	34,900
Total other assets	23,681	37,022
Total assets	2,112,528	2,041,156
Payables:
Trade	11,053	11,243
Affiliated companies	11,298	7,293
Accrued liabilities:
Taxes, other than income taxes	11,617	11,435
Interest	3,677	3,501
Exchange gas due to others	4,500	4,169
Exchange gas offset	1,499	1,428
Customer advances	2,092	1,893
Other	6,655	5,224
Long-term debt due within one year	249,874	184,924
Total current liabilities	302,265	231,110
LONG-TERM DEBT	331,748	334,236
OTHER NONCURRENT LIABILITIES:
Asset retirement obligations	67,100	60,762
Regulatory liabilities	246,504	30,717
Other	1,730	7,316
Total other noncurrent liabilities	315,334	98,795
CONTINGENT LIABILITIES AND COMMITMENTS (Note 3)
MEMBER'S EQUITY:
Member's capital	1,073,892	1,073,892
Retained earnings	89,289	303,123
Total member's equity	1,163,181	1,377,015
Total liabilities and member's equity	$ 2,112,528	$ 2,041,156