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Consolidated Statements of Cash Flows - TNMP - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Cash Flows From Operating Activities:      
Net earnings $ 258,722 $ 106,879 $ 185,180
Adjustments to reconcile net earnings to net cash flows from operating activities:      
 Depreciation and amortization 423,010 353,692 341,123
Deferred income tax expense (benefit) 43,050 (13,509) 24,533
Regulatory disallowances 8,980 71,923 832
Allowance for equity funds used during construction and other, net (17,887) (14,978) (13,799)
Changes in certain assets and liabilities:      
Accounts receivable and unbilled revenues (13,349) 53,229 (73,099)
Materials, supplies, and fuel stock (33,804) (31,301) (8,528)
Other current assets 31,967 (52,225) 17,159
Other assets (83,541) (25,820) 5,002
Accounts payable 10,021 (33,536) 47,568
Accrued interest and taxes 5,114 17,526 9,205
Other current liabilities (106,374) 125,580 (28,516)
Other liabilities (94) 4,963 (27,935)
Net cash flows from operating activities 508,160 551,171 567,284
Cash Flows From Investing Activities:      
Utility plant additions (1,247,041) (1,075,812) (912,557)
Net cash flows used in investing activities (1,174,372) (1,088,406) (950,347)
Cash Flows From Financing Activities:      
Revolving credit facilities borrowings 2,892,200 2,358,900 1,829,500
Revolving credit facilities repayments (2,544,800) (2,329,000) (1,660,200)
Long-term borrowings 1,233,000 1,358,096 558,000
Repayment of long-term debt (819,529) (910,000) (179,500)
Transmission interconnection and security deposit arrangements 92,272 49,807 96,550
Refunds paid under transmission interconnection and security deposit arrangements (79,011) (21,124) (107,397)
Debt issuance costs and other, net (20,482) (9,836) (5,564)
Net cash flows from financing activities 684,354 537,100 386,037
Change in Cash, Cash Equivalents, and Restricted Cash 18,142 (135) 2,974
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year 3,943 4,078 1,104
Cash, Cash Equivalents, and Restricted Cash at End of Year 22,085 3,943 4,078
Supplemental Cash Flow Disclosures:      
Interest paid, net of amounts capitalized 207,972 155,273 118,485
Income taxes paid (refunded), net (998) 1,505 (1,011)
Supplemental schedule of noncash investing and financing activities:      
(Increase) decrease in accrued plant additions 10,728 (23,002) 4,455
TNMP      
Cash Flows From Operating Activities:      
Net earnings 103,528 94,937 92,267
Adjustments to reconcile net earnings to net cash flows from operating activities:      
 Depreciation and amortization 126,868 113,854 99,165
Deferred income tax expense (benefit) 26,363 2,888 (4,556)
Regulatory disallowances 0 1,173 0
Allowance for equity funds used during construction and other, net (5,222) (5,145) (4,477)
Changes in certain assets and liabilities:      
Accounts receivable and unbilled revenues (2,053) 1,916 (12,356)
Materials, supplies, and fuel stock (7,889) (5,620) (3,723)
Other current assets 11,063 3,650 (264)
Other assets (33,601) 3,109 3,834
Accounts payable (832) 171 195
Accrued interest and taxes (818) 2,886 14,667
Other current liabilities (5,355) (156) 11,952
Other liabilities 1,564 949 (1,757)
Net cash flows from operating activities 213,616 214,612 194,947
Cash Flows From Investing Activities:      
Utility plant additions (541,604) (464,436) (449,534)
Net cash flows used in investing activities (541,604) (464,436) (449,534)
Cash Flows From Financing Activities:      
Revolving credit facilities borrowings 637,000 407,600 480,500
Revolving credit facilities repayments (540,500) (389,200) (444,200)
Long-term borrowings 285,000 185,000 160,000
Repayment of long-term debt (80,000) 0 0
Transmission interconnection and security deposit arrangements 11,250 11,000 6,400
Refunds paid under transmission interconnection and security deposit arrangements (4,850) (3,500) (14,150)
Equity contribution from parent 24,000 40,900 68,000
Debt issuance costs and other, net (3,679) (1,976) (1,963)
Net cash flows from financing activities 328,221 249,824 254,587
Change in Cash, Cash Equivalents, and Restricted Cash 233 0 0
Cash, Cash Equivalents, and Restricted Cash at Beginning of Year 0 0 0
Cash, Cash Equivalents, and Restricted Cash at End of Year 233 0 0
Supplemental Cash Flow Disclosures:      
Interest paid, net of amounts capitalized 50,956 41,847 33,974
Income taxes paid (refunded), net 11,021 16,904 9,245
Supplemental schedule of noncash investing and financing activities:      
(Increase) decrease in accrued plant additions $ (16,328) $ (17,297) $ (9,131)