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Schedule I - Condensed Financial Information of Parent Company - Statements of Earnings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]      
Operating Revenues $ 1,971,199 $ 1,939,198 $ 2,249,555
Operating Expenses 1,517,713 1,707,858 1,855,795
Operating income 453,486 231,340 393,760
Other Income and Deductions:      
Other income 28,621 24,204 21,601
Net other income and (deductions) 54,820 49,544 (54,542)
Interest Charges 228,066 190,355 127,908
Earnings before Income Taxes 280,240 90,529 211,310
Income Tax (Benefit) 21,518 (16,350) 26,130
PNM Resources      
Condensed Financial Statements, Captions [Line Items]      
Operating Revenues 0 0 0
Operating Expenses 9,406 4,972 6,199
Operating income (9,406) (4,972) (6,199)
Other Income and Deductions:      
Equity in earnings of subsidiaries 299,867 133,628 197,860
Other income 1,427 2,245 663
Net other income and (deductions) 301,294 135,873 198,523
Interest Charges 64,916 58,934 30,430
Earnings before Income Taxes 226,972 71,967 161,894
Income Tax (Benefit) (15,182) (15,851) (7,636)
Net earnings $ 242,154 $ 87,818 $ 169,530