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Pension and Other Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2020
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | 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,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (In thousands)
PBO at beginning of year | $ | 605,745 |  |  | $ | 564,258 |  |  | $ | 65,574 |  |  | $ | 60,587 |
Service cost | — |  |  | — |  |  | — |  |  | — |
Interest cost | 19,941 |  |  | 25,175 |  |  | 2,177 |  |  | 2,686 |
Actuarial (gain) loss | 47,567 |  |  | 61,151 |  |  | 4,459 |  |  | 7,889 |
Benefits paid | (42,349) |  |  | (44,839) |  |  | (4,820) |  |  | (5,588) |
PBO at end of year | 630,904 |  |  | 605,745 |  |  | 67,390 |  |  | 65,574 |
Fair value of plan assets at beginning of year | 531,467 |  |  | 489,978 |  |  | 59,367 |  |  | 55,074 |
Actual return on plan assets | 98,412 |  |  | 86,328 |  |  | 11,602 |  |  | 9,881 |
Employer contributions | — |  |  | — |  |  | — |  |  | — |
Benefits paid | (42,349) |  |  | (44,839) |  |  | (4,820) |  |  | (5,588) |
Fair value of plan assets at end of year | 587,530 |  |  | 531,467 |  |  | 66,149 |  |  | 59,367 |
Funded status – asset (liability) for pension benefits | $ | (43,374) |  |  | $ | (74,278) |  |  | $ | (1,241) |  |  | $ | (6,207) |
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,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (In thousands)
APBO at beginning of year | $ | 75,121 |  |  | $ | 75,305 |  |  | $ | 11,235 |  |  | $ | 10,064 |
Service cost | 38 |  |  | 53 |  |  | 46 |  |  | 50 |
Interest cost | 2,453 |  |  | 3,316 |  |  | 373 |  |  | 451 |
Participant contributions | 1,714 |  |  | 2,131 |  |  | 243 |  |  | 316 |
Actuarial (gain) loss | 3,261 |  |  | 2,587 |  |  | 747 |  |  | 1,004 |
Benefits paid | (7,391) |  |  | (8,271) |  |  | (706) |  |  | (650) |
APBO at end of year | 75,196 |  |  | 75,121 |  |  | 11,938 |  |  | 11,235 |
Fair value of plan assets at beginning of year | 86,400 |  |  | 69,703 |  |  | 10,844 |  |  | 8,744 |
Actual return on plan assets | 9,423 |  |  | 19,257 |  |  | 2,505 |  |  | 2,434 |
Employer contributions | 3,256 |  |  | 3,580 |  |  | — |  |  | — |
Participant contributions | 1,714 |  |  | 2,131 |  |  | 243 |  |  | 316 |
Benefits paid | (7,391) |  |  | (8,271) |  |  | (707) |  |  | (650) |
Fair value of plan assets at end of year | 93,402 |  |  | 86,400 |  |  | 12,885 |  |  | 10,844 |
Funded status – asset (liability) | $ | 18,206 |  |  | $ | 11,279 |  |  | $ | 947 |  |  | $ | (391) |
Schedule of Assumptions Used | Actuarial (gain) loss results from changes in:
| PNM |  | TNMP
| Year Ended December 31, |  | Year Ended December 31,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (in thousands)
Discount rates | $ | 44,960 |  |  | $ | 66,108 |  |  | $ | 4,756 |  |  | $ | 8,006 |
Demographic experience | 2,607 |  |  | (732) |  |  | (54) |  |  | 394 |
Mortality rate | — |  |  | (4,225) |  |  | — |  |  | (296) |
Other assumptions and experience | — |  |  | — |  |  | (243) |  |  | (215) |
| $ | 47,567 |  |  | $ | 61,151 |  |  | $ | 4,459 |  |  | $ | 7,889 |
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 | 2020 |  | 2019 |  | 2018
Discount rate for determining December 31 PBO | 2.66 | % |  | 3.42 | % |  | 4.65 | %
Discount rate for determining net periodic benefit cost (income) | 3.42 | % |  | 4.65 | % |  | 4.05 | %
Expected return on plan assets | 5.90 | % |  | 6.86 | % |  | 6.54 | %
Rate of compensation increase | N/A |  | N/A |  | N/A
TNMP |  |  |  |  |
Discount rate for determining December 31 PBO | 2.69 | % |  | 3.46 | % |  | 4.63 | %
Discount rate for determining net periodic benefit cost (income) | 3.46 | % |  | 4.63 | % |  | 4.01 | %
Expected return on plan assets | 5.90 | % |  | 6.90 | % |  | 6.57 | %
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,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (in thousands)
Discount rates | $ | 4,959 |  |  | $ | 7,236 |  |  | $ | 1,008 |  |  | $ | 1,375 |
Claims, contributions, and demographic experience | (1,698) |  |  | (4,022) |  |  | (261) |  |  | (311) |
Assumed participation rate | — |  |  | — |  |  | — |  |  | — |
Mortality rate | — |  |  | (627) |  |  | — |  |  | (60) |
| $ | 3,261 |  |  | $ | 2,587 |  |  | $ | 747 |  |  | $ | 1,004 |
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 | 2020 |  | 2019 |  | 2018
Discount rate for determining December 31 APBO | 2.65 | % |  | 3.42 | % |  | 4.63 | %
Discount rate for determining net periodic benefit cost | 3.42 | % |  | 4.63 | % |  | 4.00 | %
Expected return on plan assets | 7.00 | % |  | 7.20 | % |  | 7.42 | %
Rate of compensation increase | N/A |  | N/A |  | N/A
TNMP |  |  |  |  |
Discount rate for determining December 31 APBO | 2.65 | % |  | 3.42 | % |  | 4.63 | %
Discount rate for determining net periodic benefit cost | 3.42 | % |  | 4.63 | % |  | 4.00 | %
Expected return on plan assets | 5.60 | % |  | 5.80 | % |  | 5.86 | %
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 | 2020 |  | 2019 |  | 2018
Discount rate for determining December 31 PBO | 2.68 | % |  | 3.44 | % |  | 4.66 | %
Discount rate for determining net periodic benefit cost | 3.44 | % |  | 4.66 | % |  | 4.05 | %
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 | 2.69 | % |  | 3.46 | % |  | 4.63 | %
Discount rate for determining net periodic benefit cost | 3.46 | % |  | 4.63 | % |  | 4.01 | %
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 Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year | The following table presents pre-tax information about net actuarial (gain) loss in AOCI as of December 31, 2020.
|  |  | PNM |  | TNMP
|  |  | (In thousands)
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at beginning of year |  |  | $ | 146,391 |  |  | $ | — |
Experience (gain) loss |  |  | (21,393) |  |  | 3,860 |
Regulatory asset (liability) adjustment |  |  | 15,211 |  |  | (3,860) |
Amortization recognized in net periodic benefit cost (income) |  |  | (8,131) |  |  | — |
Amounts in AOCI not yet recognized in net periodic benefit cost (income) at end of year |  |  | $ | 132,078 |  |  | $ | — |
The following table presents pre-tax information about net actuarial loss in AOCI as of December 31, 2020.
| December 31, 2020
| PNM |  | TNMP
| (In thousands)
Amount in AOCI not yet recognized in net periodic benefit cost at beginning of year | $ | 2,395 |  |  | $ | — |
Experience (gain) loss | 78 |  |  | 58 |
Regulatory asset (liability) adjustment | (45) |  |  | (58) |
Amortization recognized in net periodic benefit cost (income) | (169) |  |  | — |
Amount in AOCI not yet recognized in net periodic benefit cost at end of year | $ | 2,259 |  |  | $ | — |
Schedule of Net Benefit Costs | The following table presents the components of net periodic benefit cost (income):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (In thousands)
PNM |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 19,941 |  |  | 25,175 |  |  | 24,270 |
Expected return on plan assets | (29,453) |  |  | (34,103) |  |  | (34,686) |
Amortization of net (gain) loss | 17,860 |  |  | 15,518 |  |  | 16,348 |
Amortization of prior service cost | (554) |  |  | (965) |  |  | (965) |
Net periodic benefit cost | $ | 7,794 |  |  | $ | 5,625 |  |  | $ | 4,967 |
TNMP |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 2,177 |  |  | 2,686 |  |  | 2,625 |
Expected return on plan assets | (3,284) |  |  | (3,868) |  |  | (3,963) |
Amortization of net (gain) loss | 1,258 |  |  | 941 |  |  | 1,088 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | 151 |  |  | $ | (241) |  |  | $ | (250) |
The following table presents the components of net periodic benefit cost (income):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (In thousands)
PNM |  |  |  |  |
Service cost | $ | 38 |  |  | $ | 53 |  |  | $ | 83 |
Interest cost | 2,453 |  |  | 3,316 |  |  | 3,439 |
Expected return on plan assets | (5,548) |  |  | (5,278) |  |  | (5,414) |
Amortization of net (gain) loss | 348 |  |  | 675 |  |  | 2,354 |
Amortization of prior service credit | — |  |  | (397) |  |  | (1,664) |
Net periodic benefit cost (income) | $ | (2,709) |  |  | $ | (1,631) |  |  | $ | (1,202) |
TNMP |  |  |  |  |
Service cost | $ | 46 |  |  | $ | 50 |  |  | $ | 134 |
Interest cost | 373 |  |  | 451 |  |  | 477 |
Expected return on plan assets | (538) |  |  | (517) |  |  | (542) |
Amortization of net (gain) loss | (323) |  |  | (444) |  |  | (227) |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost (income) | $ | (442) |  |  | $ | (460) |  |  | $ | (158) |
The following table presents the components of net periodic benefit cost:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (In thousands)
PNM |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 491 |  |  | 651 |  |  | 622 |
Amortization of net (gain) loss | 403 |  |  | 318 |  |  | 359 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 894 |  |  | $ | 969 |  |  | $ | 981 |
TNMP |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 22 |  |  | 30 |  |  | 29 |
Amortization of net (gain) loss | 24 |  |  | 15 |  |  | 15 |
Amortization of prior service cost | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 46 |  |  | $ | 45 |  |  | $ | 44 |
Schedule of Expected Benefit Payments | The following pension benefit payments are expected to be paid:
| PNM |  | TNMP
| (In thousands)
2021 | $ | 46,312 |  |  | $ | 5,301 |
2022 | 45,583 |  |  | 5,193 |
2023 | 44,299 |  |  | 4,936 |
2024 | 43,066 |  |  | 4,702 |
2025 | 41,869 |  |  | 4,589 |
2026 - 2030 | 188,950 |  |  | 19,829 |
The following OPEB payments, which reflect expected future service and are net of participant contributions, are expected to be paid:
| PNM |  | TNMP
| (In thousands)
2021 | $ | 6,455 |  |  | $ | 649 |
2022 | 6,132 |  |  | 678 |
2023 | 5,960 |  |  | 698 |
2024 | 5,711 |  |  | 709 |
2025 | 5,357 |  |  | 713 |
2026 - 2030 | 22,474 |  |  | 3,400 |
The following executive retirement plan payments, which reflect expected future service, are expected:
| PNM |  | TNMP
| (In thousands)
2021 | $ | 1,341 |  |  | $ | 93 |
2022 | 1,303 |  |  | 90 |
2023 | 1,259 |  |  | 85 |
2024 | 1,210 |  |  | 80 |
2025 | 1,156 |  |  | 73 |
2026 - 2030 | 4,856 |  |  | 252 |
Schedule of Health Care Cost Trend Rates | The following table shows the assumed health care cost trend rates for the PNM OPEB plan:
| PNM
| December 31,
| 2020 |  | 2019
Health care cost trend rate assumed for next year | 6.25 | % |  | 6.50 | %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 5.00 | % |  | 5.00 | %
Year that the rate reaches the ultimate trend rate | 2026 |  | 2026
Schedule of Net Funded Status | 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,
| 2020 |  | 2019 |  | 2020 |  | 2019
| (In thousands)
PBO at beginning of year | $ | 14,994 |  |  | $ | 14,726 |  |  | $ | 692 |  |  | $ | 702 |
Service cost | — |  |  | — |  |  | — |  |  | — |
Interest cost | 491 |  |  | 651 |  |  | 22 |  |  | 30 |
Actuarial (gain) loss | 78 |  |  | 1,053 |  |  | 58 |  |  | 54 |
Benefits paid | (1,341) |  |  | (1,436) |  |  | (94) |  |  | (94) |
PBO at end of year – funded status | 14,222 |  |  | 14,994 |  |  | 678 |  |  | 692 |
Less current liability | 1,323 |  |  | 1,434 |  |  | 91 |  |  | 91 |
Non-current liability | $ | 12,899 |  |  | $ | 13,560 |  |  | $ | 587 |  |  | $ | 601 |
Summary of Expenses for Other Retirement Plans | A summary of expenses for these other retirement plans is as follows:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (In thousands)
PNMR |  |  |  |  |
401(k) plan | $ | 16,247 |  |  | $ | 16,097 |  |  | $ | 16,677 |
Non-qualified plan | $ | 2,090 |  |  | $ | 4,551 |  |  | $ | 865 |
PNM |  |  |  |  |
401(k) plan | $ | 11,676 |  |  | $ | 11,587 |  |  | $ | 12,052 |
Non-qualified plan | $ | 1,544 |  |  | $ | 3,384 |  |  | $ | 621 |
TNMP |  |  |  |  |
401(k) plan | $ | 4,572 |  |  | $ | 4,511 |  |  | $ | 4,625 |
Non-qualified plan | $ | 547 |  |  | $ | 1,167 |  |  | $ | 244 |

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