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Segment Information - Schedule of Gross Margin (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Gross margin | $ 198,498 | $ 181,627 | $ 374,426 | $ 368,338
Transmission and distribution costs | 25,051 | 25,465 | 47,815 | 47,661
Depreciation and amortization | 85,263 | 72,013 | 168,932 | 143,139
Utility margin | 333,396 | 304,704 | 637,969 | 607,095
Energy Production |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Energy production costs | 24,584 | 25,599 | 46,796 | 47,957
PNM |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross margin | 124,735 | 120,215 | 245,589 | 260,596
Transmission and distribution costs | 15,350 | 14,755 | 29,700 | 28,642
Depreciation and amortization | 54,230 | 44,064 | 107,517 | 87,750
Utility margin | 218,899 | 204,633 | 429,602 | 424,945
PNM | Energy Production |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Energy production costs | 24,584 | 25,599 | 46,796 | 47,957
TNMP |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross margin | 73,763 | 61,412 | 128,837 | 107,742
Transmission and distribution costs | 9,701 | 10,710 | 18,115 | 19,019
Depreciation and amortization | 31,033 | 27,949 | 61,415 | 55,389
Utility margin | 114,497 | 100,071 | 208,367 | 182,150
TNMP | Energy Production |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Energy production costs | 0 | 0 | 0 | 0
Corporate and Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross margin | 0 | 0 | 0 | 0
Transmission and distribution costs | 0 | 0 | 0 | 0
Depreciation and amortization | 0 | 0 | 0 | 0
Utility margin | 0 | 0 | 0 | 0
Corporate and Other | Energy Production |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Energy production costs | $ 0 | $ 0 | $ 0 | $ 0

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