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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
PNM | Pension Plan        
Components of Net Periodic Benefit Cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 5,427 5,913 16,282 17,740
Expected return on plan assets (7,758) (7,299) (23,272) (21,897)
Amortization of net (gain) loss 2,661 2,646 7,984 7,937
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 330 1,260 994 3,780
PNM | OPEB Plan        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 597 675 1,791 2,027
Expected return on plan assets (1,391) (1,242) (4,173) (3,727)
Amortization of net (gain) loss 0 0 0 0
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (794) (567) (2,382) (1,700)
PNM | Executive Retirement Program        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 124 135 372 405
Expected return on plan assets 0 0 0 0
Amortization of net (gain) loss 50 38 150 114
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 174 173 522 519
Texas-New Mexico Power Company | Pension Plan        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 553 601 1,660 1,802
Expected return on plan assets (687) (674) (2,061) (2,023)
Amortization of net (gain) loss 139 110 417 329
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) 5 37 16 108
Texas-New Mexico Power Company | OPEB Plan        
Components of Net Periodic Benefit Cost        
Service cost 5 5 16 16
Interest cost 96 106 289 319
Expected return on plan assets (129) (120) (386) (361)
Amortization of net (gain) loss (161) (190) (482) (570)
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) (189) (199) (563) (596)
Texas-New Mexico Power Company | Executive Retirement Program        
Components of Net Periodic Benefit Cost        
Service cost 0 0 0 0
Interest cost 4 3 12 9
Expected return on plan assets 0 0 0 0
Amortization of net (gain) loss 0 0 0 0
Amortization of prior service cost 0 0 0 0
Net Periodic Benefit Cost (Income) $ 4 $ 3 $ 12 $ 9