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Pension and Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
PNM | Pension Plan    
Components of Net Periodic Benefit Cost    
Service cost $ 0 $ 0
Interest cost 5,385 5,427
Expected return on plan assets (7,458) (7,757)
Amortization of net (gain) loss 3,123 2,661
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) 1,050 331
PNM | OPEB Plan    
Components of Net Periodic Benefit Cost    
Service cost 0 0
Interest cost 567 597
Expected return on plan assets (1,384) (1,391)
Amortization of net (gain) loss 0 0
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) (817) (794)
PNM | Executive Retirement Program    
Components of Net Periodic Benefit Cost    
Service cost 0 0
Interest cost 122 124
Expected return on plan assets 0 0
Amortization of net (gain) loss 47 50
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) 169 174
Texas-New Mexico Power Company | Pension Plan    
Components of Net Periodic Benefit Cost    
Service cost 0 0
Interest cost 536 553
Expected return on plan assets (733) (687)
Amortization of net (gain) loss 168 139
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) (29) 5
Texas-New Mexico Power Company | OPEB Plan    
Components of Net Periodic Benefit Cost    
Service cost 4 5
Interest cost 93 96
Expected return on plan assets (120) (129)
Amortization of net (gain) loss (124) (161)
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) (147) (189)
Texas-New Mexico Power Company | Executive Retirement Program    
Components of Net Periodic Benefit Cost    
Service cost 0 0
Interest cost 0 4
Expected return on plan assets 0 0
Amortization of net (gain) loss 0 0
Amortization of prior service cost 0 0
Net Periodic Benefit Cost (Income) $ 0 $ 4