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Pension and Other Postretirement Benefits - Pre-Tax Information about Prior Service Cost and Net Actuarial (Gain) loss in AOCI (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($)
PNM | Pension Plan |
Net actuarial (gain) loss |
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year | $ 110,345
Experience (gain) loss | (6,193)
Regulatory asset (liability) adjustment | 4,629
Amortization recognized in net periodic benefit (income) | (4,713)
Amounts in AOCI not yet recognized in net periodic benefit cost at end of year | 104,068
PNM | Executive Retirement Program |
Net actuarial (gain) loss |
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year | 995
Experience (gain) loss | 411
Regulatory asset (liability) adjustment | (238)
Amortization recognized in net periodic benefit (income) | (64)
Amounts in AOCI not yet recognized in net periodic benefit cost at end of year | 1,104
TNMP | Pension Plan |
Net actuarial (gain) loss |
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year | 0
Experience (gain) loss | 1,005
Regulatory asset (liability) adjustment | (1,005)
Amortization recognized in net periodic benefit (income) | 0
Amounts in AOCI not yet recognized in net periodic benefit cost at end of year | 0
TNMP | Executive Retirement Program |
Net actuarial (gain) loss |
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year | 0
Experience (gain) loss | 13
Regulatory asset (liability) adjustment | (13)
Amortization recognized in net periodic benefit (income) | 0
Amounts in AOCI not yet recognized in net periodic benefit cost at end of year | $ 0

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