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Segment Information - Schedule of Financial Information by Segment (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
segment
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric Operating Revenues $ 1,971,199 $ 1,939,198 $ 2,249,555
Administrative and general 212,742 194,274 196,448
Administrative and general - corporate allocation 0 0 0
Customer related expenses 34,374 33,626 30,701
Regulatory disallowances 8,980 71,923 832
Depreciation and amortization 384,925 319,503 304,853
Transmission and distribution costs 98,380 98,721 94,684
Taxes other than income taxes 100,580 95,940 92,989
Total operating expenses 1,517,713 1,707,858 1,855,795
Net other income and (deductions) 54,820 49,544 (54,542)
Interest charges (228,066) (190,355) (127,908)
Income Taxes (Benefits) 21,518 (16,350) 26,130
Valencia non-controlling interest (16,040) (18,533) (15,122)
Preferred Stock Dividend Requirements of Subsidiary (528) (528) (528)
Net earnings attributable to TXNM, basic 242,154 87,818 169,530
Total Assets 11,211,733 10,252,605 9,257,377
Goodwill $ 278,297 278,297 278,297
PNM      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Segment Reporting Information, Profit (Loss) [Abstract]      
Administrative and general $ 63,105 52,554 62,505
Administrative and general - corporate allocation 132,209 124,321 115,416
Customer related expenses 31,246 29,775 26,925
Regulatory disallowances 8,980 70,750 832
Depreciation and amortization 221,780 177,633 180,812
Transmission and distribution costs 61,302 61,725 58,278
Taxes other than income taxes 49,807 48,790 49,210
Total operating expenses 1,097,095 1,320,772 1,505,338
Net other income and (deductions) 61,494 41,358 (62,196)
Interest charges (106,018) (86,574) (61,073)
Income Taxes (Benefits) 29,217 (16,758) 19,198
Valencia non-controlling interest (16,040) (18,533) (15,122)
Preferred Stock Dividend Requirements of Subsidiary (528) (528) (528)
Net earnings attributable to TXNM, basic 191,684 35,657 103,370
Total Assets 7,407,279 6,813,065 6,272,166
Goodwill $ 51,632 51,632 51,632
TNMP      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Segment Reporting Information, Profit (Loss) [Abstract]      
Administrative and general $ (1,452) 2,710 3,607
Administrative and general - corporate allocation 53,166 47,470 42,293
Customer related expenses 2,997 3,783 3,692
Regulatory disallowances 0 1,173 0
Depreciation and amortization 125,915 113,142 98,316
Transmission and distribution costs 37,078 36,996 36,406
Taxes other than income taxes 44,441 41,311 38,521
Total operating expenses 411,211 385,232 346,763
Net other income and (deductions) 8,725 8,368 8,653
Interest charges (58,983) (46,152) (37,192)
Income Taxes (Benefits) 27,114 17,297 15,161
Valencia non-controlling interest 0 0 0
Preferred Stock Dividend Requirements of Subsidiary 0 0 0
Net earnings attributable to TXNM, basic 103,528 94,937 92,267
Total Assets 3,649,125 3,145,031 2,746,601
Goodwill 226,665 226,665 226,665
Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Administrative and general 151,089 139,010 130,336
Administrative and general - corporate allocation (185,375) (171,791) (157,709)
Customer related expenses 131 68 84
Regulatory disallowances 0 0 0
Depreciation and amortization 37,230 28,728 25,725
Transmission and distribution costs 0 0 0
Taxes other than income taxes 6,332 5,839 5,258
Total operating expenses 9,407 1,854 3,694
Net other income and (deductions) (15,399) (182) (999)
Interest charges (63,065) (57,629) (29,643)
Income Taxes (Benefits) (34,813) (16,889) (8,229)
Valencia non-controlling interest 0 0 0
Preferred Stock Dividend Requirements of Subsidiary 0 0 0
Net earnings attributable to TXNM, basic (53,058) (42,776) (26,107)
Total Assets 155,329 294,509 238,610
Goodwill 0 0 0
Electricity      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric Operating Revenues 1,971,199 1,939,198 2,249,555
Cost of Goods and Services Sold 583,984 802,261 987,941
Electricity | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric Operating Revenues 1,379,088 1,403,948 1,766,825
Electricity | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric Operating Revenues 592,111 535,250 482,730
Electricity | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric Operating Revenues 0 0 0
Fuel burn      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 130,380 138,538 299,411
Fuel burn | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 130,380 138,538 299,411
Fuel burn | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 0 0 0
Fuel burn | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 0 0 0
Purchases for resale      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 286,399 499,921 541,828
Purchases for resale | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 286,399 499,921 541,828
Purchases for resale | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 0 0 0
Purchases for resale | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 0 0 0
Transmission by others      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 167,205 163,802 147,158
Transmission by others | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 18,139 25,155 23,230
Transmission by others | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 149,066 138,647 123,928
Transmission by others | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 0 0 0
Trading mark-to-market      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold     (456)
Trading mark-to-market | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold     (456)
Trading mark-to-market | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold     0
Trading mark-to-market | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold     0
Energy production costs      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 93,748 91,610 147,347
Energy production costs | PNM      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 93,748 91,610 147,347
Energy production costs | TNMP      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold 0 0 0
Energy production costs | Corporate and Other      
Segment Reporting Information, Profit (Loss) [Abstract]      
Cost of Goods and Services Sold $ 0 $ 0 $ 0