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Consolidated Statements of Cash Flows - TXNM - 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
(Gain) on sale of NMRD (4,449) 0 0
(Gains) losses on investment securities (26,851) (19,246) 78,357
Stock based compensation expense 9,480 7,190 7,825
Regulatory disallowances 8,980 71,923 832
Allowance for equity funds used during construction (17,887) (14,978) (13,799)
Other, net 4,165 804 2,377
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:      
Additions to utility and non-utility plant (1,247,041) (1,075,812) (912,557)
Proceeds from sale of plant assets (Note 8) 2,840 32,654 0
Proceeds from sales of investment securities 707,338 574,199 526,448
Purchases of investment securities (756,805) (593,241) (564,912)
Proceeds from sale of NMRD 116,936 0 0
Investments in NMRD (12,550) (26,250) 0
Other, net 14,910 44 674
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)
Issuance of common stock 98,601 198,177 0
Awards of common stock (8,460) (9,646) (7,980)
Dividends paid (140,339) (126,705) (119,839)
Valencia’s transactions with its owner (19,098) (21,569) (17,533)
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
Restricted Cash Included in Other Current Assets and Other Deferred Charges on Consolidated Balance Sheets:      
At beginning of period 1,728 0 0
At end of period 17,587 1,728 0
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