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Schedule I - Condensed Financial Information of Parent Company - Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Assets      
Cash and cash equivalents $ 4,498 $ 2,215  
Accounts receivable 130,351 126,291  
Income taxes receivable 7,684 6,697  
Other current assets 16,086 8,920  
Total current assets 498,836 475,543  
Property, plant and equipment, net of accumulated depreciation of $19,650 and $18,810 8,437,008 7,609,862  
Other long-term assets 259 171  
Total assets 11,211,733 10,252,605 $ 9,257,377
Liabilities and Stockholders’ Equity      
Short-term debt 609,300 261,900  
Current installments of long-term debt 611,603 280,169  
Intercompany payables 204,468 205,175  
Accrued interest and taxes 104,756 98,655  
Dividends declared 36,889 35,085  
Other current liabilities 84,998 94,397  
Total current liabilities 1,775,098 1,230,760  
Long-term debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs 4,311,765 4,241,642  
Total liabilities 8,616,919 7,842,025  
Common stock (no par value; 200,000,000 and 120,000,000 shares authorized; issued and outstanding 92,659,335 and 90,200,384 shares) 1,724,444 1,624,823  
Accumulated other comprehensive income (loss), net of income taxes (75,708) (62,840)  
Retained earnings 887,649 787,110  
Total TXNM common stockholders’ equity 2,536,385 2,349,093  
Total liabilities and stockholders' equity $ 11,211,733 $ 10,252,605  
Common stock, shares authorized (in shares) 200,000,000 120,000,000  
Common stock, shares issued (in shares) 92,659,335 92,659,335  
Common stock, shares outstanding (in shares) 90,200,384 90,200,384  
PNM Resources      
Assets      
Cash and cash equivalents $ 61 $ 64  
Derivative instruments 0 7,172  
Income taxes receivable 15,326 8,266  
Other current assets 15 133  
Total current assets 15,402 71,210  
Property, plant and equipment, net of accumulated depreciation of $19,650 and $18,810 19,536 20,374  
Investment in subsidiaries 3,625,611 3,345,400  
Other long-term assets 48,312 44,628  
Total long-term assets 3,693,459 3,410,402  
Total assets 3,708,861 3,481,612  
Liabilities and Stockholders’ Equity      
Current installments of long-term debt 50,967 0  
Intercompany payables 1,999 0  
Accrued interest and taxes 6,428 14,650  
Dividends declared 36,757 34,953  
Other current liabilities 571 184  
Total current liabilities 220,941 128,306  
Long-term debt, net of Unamortized Premiums, Discounts, and Debt Issuance Costs 948,731 999,151  
Other long-term liabilities 2,803 5,062  
Total liabilities 1,172,475 1,132,519  
Common stock (no par value; 200,000,000 and 120,000,000 shares authorized; issued and outstanding 92,659,335 and 90,200,384 shares) 1,724,444 1,624,823  
Accumulated other comprehensive income (loss), net of income taxes (75,708) (62,840)  
Retained earnings 887,650 787,110  
Total TXNM common stockholders’ equity 2,536,386 2,349,093  
Total liabilities and stockholders' equity $ 3,708,861 $ 3,481,612  
Common stock, shares authorized (in shares) 200,000,000 120,000,000  
Common stock, shares issued (in shares) 92,659,335 90,200,384  
Common stock, shares outstanding (in shares) 92,659,335 90,200,384  
PNM Resources | Nonrelated Party      
Liabilities and Stockholders’ Equity      
Short-term debt $ 93,900 $ 69,300  
PNM Resources | Related Party      
Assets      
Accounts receivable 0 55,575  
Liabilities and Stockholders’ Equity      
Short-term debt $ 30,319 $ 9,219