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Pension and Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
PNM | Pension Plan        
Components of Net Periodic Benefit Cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 5,385 5,427 16,154 16,282
Expected return on plan assets (7,459) (7,758) (22,375) (23,272)
Amortization of net (gain) loss 3,124 2,661 9,371 7,984
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 1,050 330 3,150 994
PNM | OPEB Plan        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 567 597 1,700 1,791
Expected return on plan assets (1,384) (1,391) (4,152) (4,173)
Amortization of net (gain) loss 0 0 0 0
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (817) (794) (2,452) (2,382)
PNM | Executive Retirement Program        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 121 124 365 372
Expected return on plan assets 0 0 0 0
Amortization of net (gain) loss 47 50 141 150
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 168 174 506 522
Texas-New Mexico Power Company | Pension Plan        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 536 553 1,608 1,660
Expected return on plan assets (733) (687) (2,199) (2,061)
Amortization of net (gain) loss 168 139 504 417
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (29) 5 (87) 16
Texas-New Mexico Power Company | OPEB Plan        
Components of Net Periodic Benefit Cost        
Service cost 4 5 13 16
Interest cost 94 96 280 289
Expected return on plan assets (120) (129) (361) (386)
Amortization of net (gain) loss (124) (161) (372) (482)
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) $ (146) $ (189) $ (440) $ (563)