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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

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