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Statement of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
OPERATING ACTIVITIES:    
Net income $ 347,835 $ 308,791
Adjustments to reconcile net cash provided (used) by operating activities:    
Depreciation and amortization 133,996 125,367
Allowance for equity funds used during construction (equity AFUDC) (19,199) (12,689)
Regulatory credit resulting from tax rate changes (7,688) (7,688)
Changes in current assets and liabilities:    
Affiliate receivables (2,075) 2,498
Trade and other accounts receivable 12,940 21,975
Transportation and exchange gas receivables (1,513) 4,184
Inventories 3,982 (164)
Regulatory assets 2,823 10,516
Other current assets (6,846) (4,678)
Affiliate payables (4,936) (5,376)
Trade accounts payable (36,872) (44,826)
Transportation and exchange gas payables (2,199) 365
Accrued liabilities (17,394) (15,781)
Other, including changes in long-term assets and liabilities (6,972) 576
Net cash provided (used) by operating activities 395,882 383,070
FINANCING ACTIVITIES:    
Proceeds from other financing obligations 1,453 3,757
Payments on other financing obligations (7,610) (6,842)
Cash distributions to parent (320,000) (310,000)
Net cash provided (used) by financing activities (326,157) (313,085)
Property, plant and equipment:    
Capital expenditures (231,846) (119,188)
Contributions and advances for construction costs, net 2,200 9,482
Disposal of property, plant and equipment, net (11,230) (7,984)
Advances to affiliate, net 172,333 50,227
Purchase of ARO Trust investments (5,566) (5,199)
Proceeds from sale of ARO Trust investments 4,384 2,677
Net cash provided (used) by investing activities (69,725) (69,985)
Increase (decrease) in cash 0 0
Cash at beginning of period 0 0
Cash at end of period 0 0
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]    
Increases to property, plant and equipment, exclusive of equity AFUDC (233,163) (116,873)
Changes in related accounts payable and accrued liabilities 1,317 (2,315)
Capital expenditures $ (231,846) $ (119,188)