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Pension and Other Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2024
Retirement Benefits [Abstract] |
Schedule of Fair Value of Plan Assets, and Funded Status of the Plans of PBO, APBO and Executive Retirement Programs | The following table presents information about the PBO, fair value of plan assets, and funded status of the plans:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2024 |  | 2023 |  | 2024 |  | 2023
| (In thousands)
PBO at beginning of year | $ | 418,657 |  |  | $ | 433,645 |  |  | $ | 42,582 |  |  | $ | 43,961 |
Service cost | — |  |  | — |  |  | — |  |  | — |
Interest cost | 21,709 |  |  | 23,653 |  |  | 2,214 |  |  | 2,402 |
Actuarial (gain) loss | (6,063) |  |  | 4,290 |  |  | (2,047) |  |  | 1,261 |
Benefits paid | (40,942) |  |  | (42,931) |  |  | (3,526) |  |  | (5,042) |
Settlements | — |  |  | — |  |  | — |  |  | — |
PBO at end of year | 393,361 |  |  | 418,657 |  |  | 39,223 |  |  | 42,582 |
Fair value of plan assets at beginning of year | 407,211 |  |  | 410,463 |  |  | 41,353 |  |  | 43,447 |
Actual return on plan assets | 12,884 |  |  | 39,679 |  |  | 247 |  |  | 2,948 |
Employer contributions | 1 |  |  | — |  |  | 151 |  |  | — |
Benefits paid | (40,942) |  |  | (42,931) |  |  | (3,526) |  |  | (5,042) |
Settlements | — |  |  | — |  |  | — |  |  | — |
Fair value of plan assets at end of year | 379,154 |  |  | 407,211 |  |  | 38,225 |  |  | 41,353 |
Funded status – asset (liability) for pension benefits | $ | (14,207) |  |  | $ | (11,446) |  |  | $ | (998) |  |  | $ | (1,229) |
The following table presents information about the APBO, the fair value of plan assets, and the funded status of the plans:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2024 |  | 2023 |  | 2024 |  | 2023
| (In thousands)
APBO at beginning of year | $ | 46,217 |  |  | $ | 49,950 |  |  | $ | 7,331 |  |  | $ | 7,705 |
Service cost | — |  |  | — |  |  | 21 |  |  | 21 |
Interest cost | 2,387 |  |  | 2,703 |  |  | 385 |  |  | 425 |
Participant contributions | 1,463 |  |  | 1,592 |  |  | 357 |  |  | 359 |
Actuarial (gain) | (2,205) |  |  | (1,608) |  |  | (147) |  |  | (282) |
Benefits paid | (6,261) |  |  | (6,420) |  |  | (1,193) |  |  | (897) |
Curtailment loss | — |  |  | — |  |  | — |  |  | — |
APBO at end of year | 41,601 |  |  | 46,217 |  |  | 6,754 |  |  | 7,331 |
Fair value of plan assets at beginning of year | 73,392 |  |  | 70,301 |  |  | 8,353 |  |  | 8,718 |
Actual return on plan assets | 3,216 |  |  | 7,762 |  |  | 25 |  |  | 173 |
Employer contributions | 193 |  |  | 157 |  |  | — |  |  | — |
Participant contributions | 1,463 |  |  | 1,592 |  |  | 357 |  |  | 359 |
Benefits paid | (6,261) |  |  | (6,420) |  |  | (1,193) |  |  | (897) |
Fair value of plan assets at end of year | 72,003 |  |  | 73,392 |  |  | 7,542 |  |  | 8,353 |
Funded status – asset | $ | 30,402 |  |  | $ | 27,175 |  |  | $ | 788 |  |  | $ | 1,022 |
Schedule of Actuarial (Gain) Loss Results and Weighted-Average Assumptions of PBO, APBO and Executive Retirement Programs | Actuarial (gain) loss results from changes in:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2024 |  | 2023 |  | 2024 |  | 2023
| (in thousands)
Discount rates | $ | (9,376) |  |  | $ | 8,806 |  |  | $ | (961) |  |  | $ | 969 |
Demographic experience | 3,313 |  |  | (1,777) |  |  | (1,125) |  |  | 538 |
Mortality rate | — |  |  | (2,739) |  |  | — |  |  | (239) |
Other assumptions and experience | — |  |  | — |  |  | 39 |  |  | (7) |
| $ | (6,063) |  |  | $ | 4,290 |  |  | $ | (2,047) |  |  | $ | 1,261 |
The following significant weighted-average assumptions were used to determine the PBO and net periodic benefit cost (income). Should actual experience differ from actuarial assumptions, the PBO and net periodic benefit cost (income) would be affected.
| Year Ended December 31,
PNM | 2024 |  | 2023 |  | 2022
Discount rate for determining December 31 PBO | 5.78 | % |  | 5.46 | % |  | 5.74 | %
Discount rate for determining net periodic benefit cost | 5.46 |  |  | 5.74 |  |  | 3.00 |
Expected return on plan assets | 6.86 |  |  | 6.30 |  |  | 5.50 |
Rate of compensation increase | N/A |  | N/A |  | N/A
TNMP |  |  |  |  |
Discount rate for determining December 31 PBO | 5.78 | % |  | 5.47 | % |  | 5.75 | %
Discount rate for determining net periodic benefit cost | 5.47 |  |  | 5.75 |  |  | 3.01 |
Expected return on plan assets | 5.95 |  |  | 5.50 |  |  | 4.40 |
Rate of compensation increase | N/A |  | N/A |  | N/A
Actuarial (gain) loss results from changes in:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2024 |  | 2023 |  | 2024 |  | 2023
| (in thousands)
Discount rates | $ | (877) |  |  | $ | 868 |  |  | $ | (179) |  |  | $ | 174 |
Claims, contributions, and demographic experience | (1,425) |  |  | (2,171) |  |  | 32 |  |  | (423) |
Assumed participation rate | 97 |  |  | — |  |  | — |  |  | — |
Mortality rate | — |  |  | (305) |  |  | — |  |  | (33) |
Dental trend assumption | — |  |  | — |  |  | — |  |  | — |
| $ | (2,205) |  |  | $ | (1,608) |  |  | $ | (147) |  |  | $ | (282) |
The following significant weighted-average assumptions were used to determine the APBO and net periodic benefit cost. Should actual experience differ from actuarial assumptions, the APBO and net periodic benefit cost would be affected.
| Year Ended December 31,
PNM | 2024 |  | 2023 |  | 2022
Discount rate for determining December 31 APBO | 5.78 | % |  | 5.48 | % |  | 5.75 | %
Discount rate for determining net periodic benefit cost | 5.48 |  |  | 5.75 |  |  | 2.99 |
Expected return on plan assets | 6.60 |  |  | 5.90 |  |  | 4.75 |
Rate of compensation increase | N/A |  | N/A |  | N/A
TNMP |  |  |  |  |
Discount rate for determining December 31 APBO | 5.78 | % |  | 5.48 | % |  | 5.75 | %
Discount rate for determining net periodic benefit cost | 5.48 |  |  | 5.75 |  |  | 2.99 |
Expected return on plan assets | 5.25 |  |  | 4.70 |  |  | 3.80 |
Rate of compensation increase | N/A |  | N/A |  | N/A
The following significant weighted-average assumptions were used to determine the PBO and net periodic benefit cost. Should actual experience differ from actuarial assumptions, the PBO and net periodic benefit cost would be affected.
| Year Ended December 31,
PNM | 2024 |  | 2023 |  | 2022
Discount rate for determining December 31 PBO | 5.78 | % |  | 5.45 | % |  | 5.73 | %
Discount rate for determining net periodic benefit cost | 5.45 |  |  | 5.73 |  |  | 3.02 |
Long-term rate of return on plan assets | N/A |  | N/A |  | N/A
Rate of compensation increase | N/A |  | N/A |  | N/A
TNMP |  |  |  |  |
Discount rate for determining December 31 PBO | N/A |  | 5.47 | % |  | 5.75 | %
Discount rate for determining net periodic benefit cost | 5.47 |  |  | 5.75 |  |  | 3.01 |
Long-term rate of return on plan assets | N/A |  | N/A |  | N/A
Rate of compensation increase | N/A |  | N/A |  | N/A
Schedule of Pre-Tax Information About Net Actuarial (Gain) Loss in AOCI | The following table presents pre-tax information about net actuarial (gain) loss in AOCI as of December 31, 2024.
|  |  | PNM |  | TNMP
|  |  | (In thousands)
Amounts in AOCI not yet recognized in net periodic benefit cost at beginning of year |  |  | $ | 104,067 |  |  | $ | — |
Experience (gain) loss |  |  | 12,081 |  |  | 456 |
Regulatory asset (liability) adjustment |  |  | (8,853) |  |  | (456) |
Amortization recognized in net periodic benefit (income) |  |  | (4,782) |  |  | — |
Amounts in AOCI not yet recognized in net periodic benefit cost at end of year |  |  | $ | 102,513 |  |  | $ | — |
The following table presents pre-tax information about net actuarial loss in AOCI as of December 31, 2024.
| December 31, 2024
| PNM |  | TNMP
| (In thousands)
Amount in AOCI not yet recognized in net periodic benefit cost at beginning of year | $ | 1,104 |  |  | $ | — |
Experience (gain) | (45) |  |  | (314) |
Regulatory asset adjustment | 26 |  |  | 314 |
Amortization recognized in net periodic benefit (income) | (84) |  |  | — |
Amount in AOCI not yet recognized in net periodic benefit cost at end of year | $ | 1,001 |  |  | $ | — |
Schedule of Components of Net Periodic Benefit Cost (Income) | The following table presents the components of net periodic benefit cost (income):
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| (In thousands)
PNM |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 21,709 |  |  | 23,653 |  |  | 16,857 |
Expected return on plan assets | (31,029) |  |  | (29,196) |  |  | (28,563) |
Amortization of net loss | 10,646 |  |  | 10,583 |  |  | 15,794 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 1,326 |  |  | $ | 5,040 |  |  | $ | 4,088 |
TNMP |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 2,214 |  |  | 2,402 |  |  | 1,720 |
Expected return on plan assets | (2,749) |  |  | (2,697) |  |  | (2,472) |
Amortization of net loss | 556 |  |  | 439 |  |  | 932 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Settlement loss | — |  |  | — |  |  | 1,033 |
Net periodic benefit cost | $ | 21 |  |  | $ | 144 |  |  | $ | 1,213 |
The following table presents the components of net periodic benefit cost (income):
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| (In thousands)
PNM |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 10 |
Interest cost | 2,387 |  |  | 2,703 |  |  | 1,914 |
Expected return on plan assets | (5,563) |  |  | (4,969) |  |  | (4,351) |
Amortization of net loss | — |  |  | — |  |  | — |
Curtailment loss | — |  |  | — |  |  | 836 |
Net periodic benefit (income) | $ | (3,176) |  |  | $ | (2,266) |  |  | $ | (1,591) |
TNMP |  |  |  |  |
Service cost | $ | 21 |  |  | $ | 21 |  |  | $ | 38 |
Interest cost | 385 |  |  | 425 |  |  | 307 |
Expected return on plan assets | (515) |  |  | (481) |  |  | (418) |
Amortization of net (gain) | (642) |  |  | (760) |  |  | (520) |
Net periodic benefit (income) | $ | (751) |  |  | $ | (795) |  |  | $ | (593) |
The following table presents the components of net periodic benefit cost:
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| (In thousands)
PNM |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 496 |  |  | 540 |  |  | 362 |
Amortization of net loss | 200 |  |  | 152 |  |  | 327 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 696 |  |  | $ | 692 |  |  | $ | 689 |
TNMP |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 15 |  |  | 18 |  |  | 11 |
Amortization of net loss | — |  |  | — |  |  | — |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 15 |  |  | $ | 18 |  |  | $ | 11 |
Schedule of Benefit Payments are Expected to be Paid | The following pension benefit payments are expected to be paid:
| PNM |  | TNMP
| (In thousands)
2025 | $ | 40,927 |  |  | $ | 4,239 |
2026 | 39,585 |  |  | 4,188 |
2027 | 38,706 |  |  | 4,000 |
2028 | 37,373 |  |  | 3,902 |
2029 | 36,231 |  |  | 3,759 |
2030 - 2034 | 160,876 |  |  | 15,464 |
The following OPEB payments, which reflect expected future service and are net of participant contributions, are expected to be paid:
| PNM |  | TNMP
| (In thousands)
2025 | $ | 4,771 |  |  | $ | 589 |
2026 | 4,560 |  |  | 597 |
2027 | 4,333 |  |  | 588 |
2028 | 4,128 |  |  | 585 |
2029 | 3,871 |  |  | 574 |
2030 - 2034 | 16,604 |  |  | 2,606 |
The following executive retirement plan payments, which reflect expected future service, are expected:
| PNM |  | TNMP
| (In thousands)
2025 | $ | 1,205 |  |  | $ | — |
2026 | 1,150 |  |  | — |
2027 | 1,089 |  |  | — |
2028 | 1,022 |  |  | — |
2029 | 952 |  |  | — |
2030 - 2034 | 3,699 |  |  | — |
Schedule of Assumed Health Care Cost Trend Rates for the PNM OPEB Plan | The following table shows the assumed health care cost trend rates for the PNM OPEB plan:
| PNM
| December 31,
| 2024 |  | 2023
Health care cost trend rate assumed for next year | 6.50 | % |  | 6.00 | %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 4.75 |  |  | 4.75 |
Year that the rate reaches the ultimate trend rate | 2033 |  | 2029
Schedule of Rollforward of Information about the Executive Retirement Programs | For the executive retirement programs, the following table presents information about the PBO and funded status of the plans:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2024 |  | 2023 |  | 2024 |  | 2023
| (In thousands)
PBO at beginning of year | $ | 9,714 |  |  | $ | 10,042 |  |  | $ | 316 |  |  | $ | 344 |
Service cost | — |  |  | — |  |  | — |  |  | — |
Interest cost | 496 |  |  | 540 |  |  | 15 |  |  | 18 |
Actuarial (gain) loss | (47) |  |  | 411 |  |  | (314) |  |  | 13 |
Benefits paid | (1,132) |  |  | (1,279) |  |  | (17) |  |  | (59) |
PBO at end of year – funded status | 9,031 |  |  | 9,714 |  |  | — |  |  | 316 |
Less current liability | 1,171 |  |  | 1,210 |  |  | — |  |  | 64 |
Non-current liability | $ | 7,860 |  |  | $ | 8,504 |  |  | $ | — |  |  | $ | 252 |
Schedule of Expenses for Other Retirement Plans | A summary of expenses for these other retirement plans is as follows:
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| (In thousands)
TXNM |  |  |  |  |
401(k) plan | $ | 17,514 |  |  | $ | 16,118 |  |  | $ | 15,844 |
Non-qualified plan | $ | 4,350 |  |  | $ | 1,197 |  |  | $ | (1,027) |
PNM |  |  |  |  |
401(k) plan | $ | 11,896 |  |  | $ | 10,839 |  |  | $ | 11,067 |
Non-qualified plan | $ | 2,937 |  |  | $ | 825 |  |  | $ | (721) |
TNMP |  |  |  |  |
401(k) plan | $ | 5,617 |  |  | $ | 5,279 |  |  | $ | 4,776 |
Non-qualified plan | $ | 1,414 |  |  | $ | 372 |  |  | $ | (305) |

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