Statement of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 39,228	$ 42,804
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	28,068	28,060
Regulatory debits	348	291
Regulatory charges resulting from tax rate changes	5,814	5,814
Amortization of deferred charges and credits	(772)	(821)
Allowance for equity funds used during construction (equity AFUDC)	(215)	(241)
Changes in current assets and liabilities:
Trade and other accounts receivable	1,822	5,132
Affiliated receivables	(9)	29
Materials and supplies	(42)	(87)
Other current assets	1,872	3,840
Trade accounts payable	(8,375)	(1,676)
Affiliated payables	3,867	(1,308)
Other accrued liabilities	6,175	578
Changes in noncurrent assets and liabilities:
Regulatory liabilities	957	1,079
Other, net	85	636
Net cash provided by operating activities	78,823	84,130
Cash flows from financing activities:
Cash distributions to parent	(55,000)	(45,000)
Net cash used in financing activities	(55,000)	(45,000)
Property, plant and equipment:
Capital expenditures	(7,426)	(9,562)
Contributions and advances for construction costs	1,699	4,094
Disposal of property, plant and equipment, net	(246)	(240)
Advances to affiliates, net	(17,850)	(33,422)
Net cash used in investing activities	(23,823)	(39,130)
NET INCREASE (DECREASE) IN CASH	0	0
CASH AT BEGINNING OF PERIOD	0	0
CASH AT END OF PERIOD	0	0
Increases to property, plant and equipment, exclusive of equity AFUDC	(5,741)	(5,520)
Changes in related accounts payable and accrued liabilities	(1,685)	(4,042)
Capital expenditures	$ (7,426)	$ (9,562)