Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash	$ 0	$ 0
Receivables:
Trade	42,143	38,884
Affiliated companies	18	1,921
Advances to affiliate	180,400	137,666
Other	970	2,618
Materials and supplies	10,046	10,084
Exchange gas due from others	4,581	2,720
Prepayments and other	8,591	6,423
Total current assets	246,749	200,316
PROPERTY, PLANT AND EQUIPMENT, at cost	3,457,982	3,396,776
Less-Accumulated depreciation	1,596,369	1,508,245
Total property, plant and equipment, net	1,861,613	1,888,531
OTHER ASSETS:
Deferred charges	1,277	934
Regulatory assets	23,992	22,747
Total other assets	25,269	23,681
Total assets	2,133,631	2,112,528
Payables:
Trade	12,839	11,053
Affiliated companies	26,532	11,298
Accrued liabilities:
Taxes, other than income taxes	11,496	11,617
Interest	5,505	3,677
Exchange gas due to others	11,660	4,500
Exchange gas offset	0	1,499
Customer advances	788	2,092
Other	7,386	6,655
Long-term debt due within one year	0	249,874
Total current liabilities	76,206	302,265
LONG-TERM DEBT	576,168	331,748
OTHER NONCURRENT LIABILITIES:
Asset retirement obligations	69,350	67,100
Regulatory liabilities	290,430	246,504
Other	835	1,730
Total other noncurrent liabilities	360,615	315,334
CONTINGENT LIABILITIES AND COMMITMENTS (Note 4)
MEMBER'S EQUITY:
Member's capital	1,073,892	1,073,892
Retained earnings	46,750	89,289
Total member's equity	1,120,642	1,163,181
Total liabilities and member's equity	$ 2,133,631	$ 2,112,528