Consolidated Balance Sheet - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash	$ 0	$ 0
Receivables:
Trade	190,833	167,928
Affiliates	1,018	1,109
Advances to affiliate	33,034	395,247
Other	10,365	2,494
Transportation and exchange gas receivables	4,515	3,205
Inventories:
Gas in storage, at original cost	875	790
Gas available for customer nomination, at average cost	25,767	1,850
Materials and supplies, at average cost	36,563	37,387
Regulatory assets	95,770	97,149
Other	12,574	12,508
Total current assets	411,314	719,667
Investments, at cost plus equity in undistributed earnings	26,520	28,505
Property, Plant and Equipment:
Natural gas transmission plant	15,908,878	13,771,183
Less-Accumulated depreciation and amortization	4,147,729	3,859,520
Total property, plant and equipment, net	11,761,149	9,911,663
Other Assets:
Regulatory assets	289,479	276,315
Other	167,490	141,786
Total other assets	456,969	418,101
Total assets	12,655,952	11,077,936
Payables:
Trade	201,350	444,021
Affiliates	50,727	43,420
Cash overdrafts	25,561	25,132
Transportation and exchange gas payables	5,973	2,121
Accrued liabilities:
Property and other taxes	15,428	12,843
Interest	62,066	49,900
Regulatory liabilities	5,097	16,350
Customer deposits	36,400	15,754
Customer advances	36,642	44,689
Asset retirement obligations	45,714	13,676
Other	22,134	20,390
Long-term debt due within one year	15,419	251,430
Total current liabilities	522,511	939,726
Long-Term Debt	3,998,988	2,191,576
Other Long-Term Liabilities:
Asset retirement obligations	348,609	350,280
Regulatory liabilities	1,026,892	990,702
Advances for construction costs	211	426,771
Deferred revenue	226,164	236,729
Other	3,977	4,828
Total other long-term liabilities	1,605,853	2,009,310
Contingent Liabilities and Commitments (Note 3)
Member's Equity:
Member's capital	4,428,499	4,088,499
Retained earnings	2,099,567	1,848,488
Accumulated other comprehensive income	534	337
Total member's equity	6,528,600	5,937,324
Total liabilities and member's equity	$ 12,655,952	$ 11,077,936