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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 2,550,707 $ 2,404,730 $ 2,583,285 $ 2,399,051
Total Other Comprehensive Income (Loss) (807) (2,292) 315 (7,060)
Ending balance 3,216,794 2,451,680 3,216,794 2,451,680
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (74,586) (67,608) (75,708) (62,840)
Amounts reclassified from AOCI (pre-tax)     2,411 (4,570)
Income tax impact of amounts reclassified     (612) 1,161
Other OCI changes (pre-tax)     (1,989) (4,894)
Income tax impact of other OCI changes     505 1,243
Total Other Comprehensive Income (Loss) (807) (2,292) 315 (7,060)
Ending balance (75,393) (69,900) (75,393) (69,900)
Fair Value Adjustment for Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     0 3,665
Amounts reclassified from AOCI (pre-tax)     0 5,563
Income tax impact of amounts reclassified     0 (1,413)
Other OCI changes (pre-tax)     (2,493) (4,307)
Income tax impact of other OCI changes     633 1,094
Total Other Comprehensive Income (Loss)     (1,860) 937
Ending balance (1,860) 4,602 (1,860) 4,602
PNM        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 2,185,737 2,034,870 2,184,198 2,000,775
Total Other Comprehensive Income (Loss) 1,053 (1,131) 2,175 (7,997)
Ending balance 2,210,809 2,119,459 2,210,809 2,119,459
PNM | Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (74,586) (73,371) (75,708) (66,505)
Amounts reclassified from AOCI (pre-tax)     2,411 (10,133)
Income tax impact of amounts reclassified     (612) 2,574
Other OCI changes (pre-tax)     504 (587)
Income tax impact of other OCI changes     (128) 149
Total Other Comprehensive Income (Loss) 1,053 (1,131) 2,175 (7,997)
Ending balance (73,533) (74,502) (73,533) (74,502)
PNM | Unrealized Gains on Available-for-Sale Debt Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     214 10,652
Amounts reclassified from AOCI (pre-tax)     (338) (12,566)
Income tax impact of amounts reclassified     86 3,192
Other OCI changes (pre-tax)     504 (587)
Income tax impact of other OCI changes     (128) 149
Total Other Comprehensive Income (Loss)     124 (9,812)
Ending balance 338 840 338 840
PNM | Pension Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (75,922) (77,157)
Amounts reclassified from AOCI (pre-tax)     2,749 2,433
Income tax impact of amounts reclassified     (698) (618)
Other OCI changes (pre-tax)     0 0
Income tax impact of other OCI changes     0 0
Total Other Comprehensive Income (Loss)     2,051 1,815
Ending balance $ (73,871) $ (75,342) $ (73,871) $ (75,342)