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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - TXNM ENERGY, INC. AND SUBSIDIARIES - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Cash Flows From Operating Activities:    
Net earnings $ 251,396 $ 175,114
Adjustments to reconcile net earnings to net cash flows from operating activities:    
Depreciation and amortization 379,835 361,095
Deferred income tax expense 37,342 19,901
Losses on investment securities (5,580) (33,691)
Stock based compensation expense 5,732 6,676
Regulatory disallowances 0 (731)
Allowance for equity funds used during construction (17,284) (11,319)
Other, net 2,863 2,735
Changes in certain assets and liabilities:    
Accounts receivable and unbilled revenues (94,175) (76,923)
Materials, supplies, and fuel stock (20,100) (6,125)
Other current assets (76,017) (13,584)
Other assets (61,557) (27,568)
Accounts payable (7,402) 3,007
Accrued interest and taxes 32,078 28,770
Other current liabilities 24,906 (2,620)
Other liabilities 496 2,053
Net cash flows from operating activities 452,533 426,790
Cash Flows From Investing Activities:    
Additions to utility plant and non-utility plant (903,010) (886,111)
Proceeds from sales of investment securities 424,925 440,720
Purchases of investment securities (430,093) (445,054)
Other, net 111 (75)
Net cash flows used in investing activities (908,067) (890,520)
Cash Flows From Financing Activities:    
Short-term borrowings 2,912,050 1,910,600
Repayments of short-term borrowings (2,857,450) (2,206,100)
Long-term borrowings 945,000 3,153,600
Repayment of long-term debt (602,303) (2,990,507)
Issuance of common stock 518,687 842,891
Cancelled common stock previously issued (400,000) 0
Awards of common stock (6,469) (8,433)
Dividends paid (136,726) (118,855)
Return of dividends previously paid (Note 12) 13,280 0
Valencia’s transactions with its owner (8,441) (15,102)
Transmission interconnection and security deposit arrangements 152,889 33,936
Refunds paid under transmission interconnection and security deposit arrangements (65,021) (102,811)
Debt issuance costs and other, net (7,234) (17,590)
Net cash flows from financing activities 458,262 481,629
Change in Cash, Cash Equivalents, and Restricted Cash 2,728 17,899
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period 31,953 22,085
Cash, Cash Equivalents, and Restricted Cash at End of Period 34,681 39,984
Restricted Cash included in Other Current Assets and Other Deferred Charges on Condensed Consolidated Balance Sheets:    
At beginning of period 13,697 17,587
At end of period 5,951 7,918
Supplemental Cash Flow Disclosures:    
Interest paid, net of amounts capitalized 189,934 161,677
Income taxes paid, net 2,048 2,350
Supplemental schedule of noncash investing activities:    
Decrease (increase) in accrued plant additions $ 43,844 $ 53,059