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Segment Information - Schedule of Summarized Financial Information (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |
Electric Operating Revenues | $ 1,939,198 | $ 2,249,555 | $ 1,779,873
Utility margin | 1,136,937 | 1,261,614 | 1,135,020
Other operating expenses | 586,094 | 563,001 | 542,760
Depreciation and amortization | 319,503 | 304,853 | 284,107
Operating income | 231,340 | 393,760 | 308,153
Interest income | 21,963 | 16,095 | 14,662
Other income (deductions) | 27,581 | (70,637) | 18,491
Interest charges | (190,355) | (127,908) | (96,877)
Earnings before Income Taxes | 90,529 | 211,310 | 244,429
Income taxes (benefit) | (16,350) | 26,130 | 32,582
Net Earnings | 106,879 | 185,180 | 211,847
Valencia non-controlling interest | (18,533) | (15,122) | (15,490)
Preferred Stock Dividends Requirements | (528) | (528) | (528)
Net Earnings Attributable to PNMR | 87,818 | 169,530 | 195,829
Total Assets | 10,252,605 | 9,257,377 | 8,666,885
Goodwill | $ 278,297 | 278,297 | 278,297
PNM |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of operating segments | segment | 1 |  |
Utility margin | $ 740,334 | 902,812 | 830,234
Other operating expenses | 479,525 | 460,513 | 438,372
Depreciation and amortization | 177,633 | 180,812 | 170,365
Operating income | 83,176 | 261,487 | 221,497
Interest income | 21,355 | 14,816 | 14,605
Other income (deductions) | 20,003 | (77,012) | 13,809
Interest charges | (86,574) | (61,073) | (51,360)
Earnings before Income Taxes | 37,960 | 138,218 | 198,551
Income taxes (benefit) | (16,758) | 19,198 | 26,992
Net Earnings | 54,718 | 119,020 | 171,559
Valencia non-controlling interest | (18,533) | (15,122) | (15,490)
Preferred Stock Dividends Requirements | (528) | (528) | (528)
Net Earnings Attributable to PNMR | 35,657 | 103,370 | 155,541
Total Assets | 6,813,065 | 6,272,166 | 6,060,133
Goodwill | $ 51,632 | 51,632 | 51,632
TNMP |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of operating segments | segment | 1 |  |
Utility margin | $ 396,603 | 358,802 | 304,786
Other operating expenses | 133,443 | 124,519 | 114,228
Depreciation and amortization | 113,142 | 98,316 | 90,440
Operating income | 150,018 | 135,967 | 100,118
Interest income | 0 | 0 | 0
Other income (deductions) | 8,368 | 8,653 | 5,408
Interest charges | (46,152) | (37,192) | (33,735)
Earnings before Income Taxes | 112,234 | 107,428 | 71,791
Income taxes (benefit) | 17,297 | 15,161 | 7,912
Net Earnings | 94,937 | 92,267 | 63,879
Valencia non-controlling interest | 0 | 0 | 0
Preferred Stock Dividends Requirements | 0 | 0 | 0
Net Earnings Attributable to PNMR | 94,937 | 92,267 | 63,879
Total Assets | 3,145,031 | 2,746,601 | 2,364,772
Goodwill | 226,665 | 226,665 | 226,665
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Utility margin | 0 | 0 | 0
Other operating expenses | (26,874) | (22,031) | (9,840)
Depreciation and amortization | 28,728 | 25,725 | 23,302
Operating income | (1,854) | (3,694) | (13,462)
Interest income | 608 | 1,279 | 57
Other income (deductions) | (790) | (2,278) | (726)
Interest charges | (57,629) | (29,643) | (11,782)
Earnings before Income Taxes | (59,665) | (34,336) | (25,913)
Income taxes (benefit) | (16,889) | (8,229) | (2,322)
Net Earnings | (42,776) | (26,107) | (23,591)
Valencia non-controlling interest | 0 | 0 | 0
Preferred Stock Dividends Requirements | 0 | 0 | 0
Net Earnings Attributable to PNMR | (42,776) | (26,107) | (23,591)
Total Assets | 294,509 | 238,610 | 241,980
Goodwill | 0 | 0 | 0
Electricity |  |  |
Segment Reporting Information [Line Items] |  |  |
Electric Operating Revenues | 1,939,198 | 2,249,555 | 1,779,873
Cost of energy | 802,261 | 987,941 | 644,853
Utility margin | 1,136,937 | 1,261,614 | 1,135,020
Electricity | PNM |  |  |
Segment Reporting Information [Line Items] |  |  |
Electric Operating Revenues | 1,403,948 | 1,766,825 | 1,362,020
Cost of energy | 663,614 | 864,013 | 531,786
Utility margin | 740,334 | 902,812 | 830,234
Electricity | TNMP |  |  |
Segment Reporting Information [Line Items] |  |  |
Electric Operating Revenues | 535,250 | 482,730 | 417,853
Cost of energy | 138,647 | 123,928 | 113,067
Utility margin | 396,603 | 358,802 | 304,786
Electricity | Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Electric Operating Revenues | 0 | 0 | 0
Cost of energy | 0 | 0 | 0
Utility margin | $ 0 | $ 0 | $ 0

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