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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 3,216,794 $ 2,451,680 $ 2,583,285 $ 2,399,051
Total Other Comprehensive Income (Loss) 1,639 (3,499) 1,954 (10,559)
Ending balance 3,461,345 2,508,048 3,461,345 2,508,048
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (75,393) (69,900) (75,708) (62,840)
Amounts reclassified from AOCI (pre-tax)     3,512 (827)
Income tax impact of amounts reclassified     (892) 210
Other OCI changes (pre-tax)     (893) (13,327)
Income tax impact of other OCI changes     227 3,385
Total Other Comprehensive Income (Loss) 1,639 (3,499) 1,954 (10,559)
Ending balance (73,754) (73,399) (73,754) (73,399)
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 8,456
Income tax impact of amounts reclassified     0 (2,148)
Other OCI changes (pre-tax)     (1,538) (13,689)
Income tax impact of other OCI changes     391 3,477
Total Other Comprehensive Income (Loss)     (1,147) (3,904)
Ending balance (1,147) (239) (1,147) (239)
PNM        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance 2,210,809 2,119,459 2,184,198 2,000,775
Total Other Comprehensive Income (Loss) 926 1,342 3,101 (6,655)
Ending balance 2,313,442 2,228,604 2,313,442 2,228,604
PNM | Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (73,533) (74,502) (75,708) (66,505)
Amounts reclassified from AOCI (pre-tax)     3,512 (9,283)
Income tax impact of amounts reclassified     (892) 2,358
Other OCI changes (pre-tax)     645 362
Income tax impact of other OCI changes     (164) (92)
Total Other Comprehensive Income (Loss) 926 1,342 3,101 (6,655)
Ending balance (72,607) (73,160) (72,607) (73,160)
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)     (611) (12,932)
Income tax impact of amounts reclassified     155 3,285
Other OCI changes (pre-tax)     645 362
Income tax impact of other OCI changes     (164) (92)
Total Other Comprehensive Income (Loss)     25 (9,377)
Ending balance 239 1,275 239 1,275
PNM | Pension Liability Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (75,922) (77,157)
Amounts reclassified from AOCI (pre-tax)     4,123 3,649
Income tax impact of amounts reclassified     (1,047) (927)
Other OCI changes (pre-tax)     0 0
Income tax impact of other OCI changes     0 0
Total Other Comprehensive Income (Loss)     3,076 2,722
Ending balance $ (72,846) $ (74,435) $ (72,846) $ (74,435)