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Condensed Consolidated Statements of Cash Flows - TXNM - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Cash Flows From Operating Activities:    
Net earnings $ 175,114 $ 238,728
Adjustments to reconcile net earnings to net cash flows from operating activities:    
Depreciation and amortization 361,095 313,919
Deferred income tax expense (benefit) 19,901 38,383
(Gain) on sale of NMRD 0 (4,449)
(Gains) on investment securities (33,691) (32,326)
Stock based compensation expense 6,676 7,845
Regulatory disallowances (731) 10,601
Allowance for equity funds used during construction (11,319) (13,911)
Other, net 2,735 3,025
Changes in certain assets and liabilities:    
Accounts receivable and unbilled revenues (76,923) (38,466)
Materials, supplies, and fuel stock (6,125) (22,484)
Other current assets (13,584) 14,835
Other assets (27,568) (80,640)
Accounts payable 3,007 (24,027)
Accrued interest and taxes 28,770 18,462
Other current liabilities (2,620) (85,393)
Other liabilities 2,053 5,419
Net cash flows from operating activities 426,790 349,521
Cash Flows From Investing Activities:    
Additions to utility plant and non-utility plant (886,111) (905,513)
Proceeds from sale of plant assets 0 2,840
Proceeds from sales of investment securities 440,720 745,645
Purchases of investment securities (445,054) (756,591)
Proceeds from sale of NMRD 0 116,936
Investments in NMRD 0 (12,550)
Other, net (75) 3,375
Net cash flows used in investing activities (890,520) (805,858)
Cash Flows From Financing Activities:    
Revolving credit facilities borrowings 1,910,600 2,181,800
Revolving credit facilities repayments (2,206,100) (1,984,700)
Long-term borrowings 3,153,600 1,233,000
Repayment of long-term debt (2,990,507) (819,529)
Issuance of common stock 842,891 0
Awards of common stock (8,433) (7,983)
Dividends paid (118,855) (105,254)
Valencia’s transactions with its owner (15,102) (13,780)
Transmission interconnection and security deposit arrangements 33,936 79,718
Refunds paid under transmission interconnection and security deposit arrangements (102,811) (74,667)
Debt issuance costs and other, net (17,590) (19,775)
Net cash flows from financing activities 481,629 468,830
Change in Cash, Cash Equivalents, and Restricted Cash 17,899 12,493
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period 22,085 3,943
Cash, Cash Equivalents, and Restricted Cash at End of Period 39,984 16,436
Restricted Cash included in Other Current Assets and Other Deferred Charges on Condensed Consolidated Balance Sheets:    
At beginning of period 17,587 1,728
At end of period 7,918 9,201
Supplemental Cash Flow Disclosures:    
Interest paid, net of amounts capitalized 161,677 147,418
Income taxes paid (refunded), net 2,350 (395)
Supplemental schedule of noncash investing activities:    
Decrease in accrued plant additions $ 53,059 $ 44,714