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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 2,399,051 $ 2,244,926 $ 2,222,929
Total Other Comprehensive Income (Loss) (12,868) 3,208 5,888
Ending balance 2,583,285 2,399,051 2,244,926
PNM      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 2,000,775 1,960,324 2,015,264
Total Other Comprehensive Income (Loss) (9,203) 7,830 (2,399)
Ending balance 2,184,198 2,000,775 1,960,324
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (62,840) (66,048) (71,936)
Amounts reclassified from AOCI (pre-tax) 2,106 6,864 2,101
Income tax impact of amounts reclassified (535) (1,743) (533)
Other OCI changes (pre-tax) (19,355) (2,565) 5,792
Income tax impact of other OCI changes 4,916 652 (1,472)
Total Other Comprehensive Income (Loss) (12,868) 3,208 5,888
Ending balance (75,708) (62,840) (66,048)
Total | PNM      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (66,505) (74,335) (71,936)
Amounts reclassified from AOCI (pre-tax) (8,242) (2,423) 3,277
Income tax impact of amounts reclassified 2,094 616 (832)
Other OCI changes (pre-tax) (4,095) 12,918 (6,493)
Income tax impact of other OCI changes 1,040 (3,281) 1,649
Total Other Comprehensive Income (Loss) (9,203) 7,830 (2,399)
Ending balance (75,708) (66,505) (74,335)
Unrealized Gains on Available-for-Sale Securities | PNM      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 10,652 7,422 11,715
Amounts reclassified from AOCI (pre-tax) (13,108) (7,199) (3,827)
Income tax impact of amounts reclassified 3,330 1,828 972
Other OCI changes (pre-tax) (885) 11,529 (1,928)
Income tax impact of other OCI changes 225 (2,928) 490
Total Other Comprehensive Income (Loss) (10,438) 3,230 (4,293)
Ending balance 214 10,652 7,422
Pension Liability Adjustment | PNM      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (77,157) (81,757) (83,651)
Amounts reclassified from AOCI (pre-tax) 4,866 4,776 7,104
Income tax impact of amounts reclassified (1,236) (1,212) (1,804)
Other OCI changes (pre-tax) (3,210) 1,389 (4,565)
Income tax impact of other OCI changes 815 (353) 1,159
Total Other Comprehensive Income (Loss) 1,235 4,600 1,894
Ending balance (75,922) (77,157) (81,757)
Fair Value Adjustment for Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 3,665 8,287 0
Amounts reclassified from AOCI (pre-tax) 10,348 9,287 (1,176)
Income tax impact of amounts reclassified (2,629) (2,359) 299
Other OCI changes (pre-tax) (15,260) (15,483) 12,285
Income tax impact of other OCI changes 3,876 3,933 (3,121)
Total Other Comprehensive Income (Loss) (3,665) (4,622) 8,287
Ending balance $ 0 $ 3,665 $ 8,287