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Pension and Other Postretirement Benefits - Schedule of Fair Value of Plan Assets, and Funded Status of the Plans of PBO, APBO and Executive Retirement Programs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Accrued pension liability and postretirement benefit cost $ 23,065 $ 21,429  
PNM      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Accrued pension liability and postretirement benefit cost 22,067 19,949  
PNM | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 418,657 433,645  
Service cost 0 0 $ 0
Interest cost 21,709 23,653 16,857
Actuarial (gain) loss (6,063) 4,290  
Benefits paid (40,942) (42,931)  
Settlements 0 0  
Balance at end of year 393,361 418,657 433,645
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 407,211 410,463  
Actual return on plan assets 12,884 39,679  
Employer contributions 1 0  
Benefits paid (40,942) (42,931)  
Settlements 0 0  
Fair value of plan assets at end of year 379,154 407,211 410,463
Funded status – asset (liability) for pension benefits (14,207) (11,446)  
PNM | Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 46,217 49,950  
Service cost 0 0 10
Interest cost 2,387 2,703 1,914
Participant contributions 1,463 1,592  
Actuarial (gain) loss (2,205) (1,608)  
Benefits paid (6,261) (6,420)  
Curtailment loss 0 0 836
Balance at end of year 41,601 46,217 49,950
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 73,392 70,301  
Actual return on plan assets 3,216 7,762  
Employer contributions 193 157  
Participant contributions 1,463 1,592  
Benefits paid (6,261) (6,420)  
Fair value of plan assets at end of year 72,003 73,392 70,301
Funded status – asset (liability) for pension benefits 30,402 27,175  
PNM | Executive Retirement Program      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 9,714 10,042  
Service cost 0 0 0
Interest cost 496 540 362
Actuarial (gain) loss (47) 411  
Benefits paid (1,132) (1,279)  
Balance at end of year 9,031 9,714 10,042
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Less current liability 1,171 1,210  
Accrued pension liability and postretirement benefit cost 7,860 8,504  
TNMP      
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Accrued pension liability and postretirement benefit cost 998 1,480  
TNMP | Pension Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 42,582 43,961  
Service cost 0 0 0
Interest cost 2,214 2,402 1,720
Actuarial (gain) loss (2,047) 1,261  
Benefits paid (3,526) (5,042)  
Settlements 0 0  
Balance at end of year 39,223 42,582 43,961
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 41,353 43,447  
Actual return on plan assets 247 2,948  
Employer contributions 151 0  
Benefits paid (3,526) (5,042)  
Settlements 0 0  
Fair value of plan assets at end of year 38,225 41,353 43,447
Funded status – asset (liability) for pension benefits (998) (1,229)  
TNMP | Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 7,331 7,705  
Service cost 21 21 38
Interest cost 385 425 307
Participant contributions 357 359  
Actuarial (gain) loss (147) (282)  
Benefits paid (1,193) (897)  
Curtailment loss 0 0  
Balance at end of year 6,754 7,331 7,705
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at beginning of year 8,353 8,718  
Actual return on plan assets 25 173  
Employer contributions 0 0  
Participant contributions 357 359  
Benefits paid (1,193) (897)  
Fair value of plan assets at end of year 7,542 8,353 8,718
Funded status – asset (liability) for pension benefits 788 1,022  
TNMP | Executive Retirement Program      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at beginning of year 316 344  
Service cost 0 0 0
Interest cost 15 18 11
Actuarial (gain) loss (314) 13  
Benefits paid (17) (59)  
Balance at end of year 0 316 $ 344
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Less current liability 0 64  
Accrued pension liability and postretirement benefit cost $ 0 $ 252