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Pension and Other Postretirement Benefit Plans (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
PNM | Pension Plan |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |
Service cost | $ 0 | $ 0 | $ 0 | $ 0
Interest cost | 4,035,000 | 4,985,000 | 8,071,000 | 9,971,000
Expected return on plan assets | (7,132,000) | (7,363,000) | (14,265,000) | (14,726,000)
Amortization of net loss | 4,542,000 | 4,465,000 | 9,083,000 | 8,930,000
Amortization of prior service cost | 0 | (138,000) | 0 | (277,000)
Net Periodic Benefit Cost (Income) | 1,445,000 | 1,949,000 | 2,889,000 | 3,898,000
Contributions by employer |  |  | 0 | 0
Expected employer contributions, remainder of fiscal year | 0 |  | 0 |
Expected employer contributions in year 2 | 10,800,000 |  | 10,800,000 |
Expected employer contributions in year 3 | 11,500,000 |  | 11,500,000 |
Expected employer contributions in year 4 | 10,600,000 |  | $ 10,600,000 |
PNM | Pension Plan | Maximum |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |
Assumptions used calculating net periodic benefit cost, discount rate |  |  | 2.90% |
PNM | OPEB Plan |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |
Service cost | 7,000 | 10,000 | $ 13,000 | 20,000
Interest cost | 477,000 | 613,000 | 954,000 | 1,227,000
Expected return on plan assets | (1,041,000) | (1,387,000) | (2,083,000) | (2,774,000)
Amortization of net loss | 0 | 87,000 | 0 | 174,000
Amortization of prior service cost |  | 0 | 0 | 0
Net Periodic Benefit Cost (Income) | (557,000) | (677,000) | (1,116,000) | (1,353,000)
Contributions by employer |  |  | 0 | 0
Disbursements by employer | 800,000 | 1,100,000 | 1,700,000 | 2,100,000
Expected employer disbursements for remainder of fiscal year | 3,300,000 |  | 3,300,000 |
Expected employer disbursements in year 2 through 5 | 13,100,000 |  | 13,100,000 |
PNM | Executive Retirement Program |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |
Service cost | 0 | 0 | 0 | 0
Interest cost | 91,000 | 122,000 | 181,000 | 244,000
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of net loss | 97,000 | 101,000 | 197,000 | 201,000
Amortization of prior service cost | 0 | 0 | 0 | 0
Net Periodic Benefit Cost (Income) | 188,000 | 223,000 | 378,000 | 445,000
Disbursements by employer | 300,000 | 300,000 | 800,000 | 800,000
Expected employer disbursements for remainder of fiscal year | 1,300,000 |  | 1,300,000 |
Expected employer disbursements in year 2 through 5 | 4,900,000 |  | 4,900,000 |
TNMP | Pension Plan |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |
Service cost | 0 | 0 | 0 | 0
Interest cost | 436,000 | 544,000 | 871,000 | 1,088,000
Expected return on plan assets | (796,000) | (821,000) | (1,591,000) | (1,642,000)
Amortization of net loss | 312,000 | 315,000 | 624,000 | 629,000
Amortization of prior service cost | 0 | 0 | 0 | 0
Net Periodic Benefit Cost (Income) | (48,000) | 38,000 | (96,000) | 75,000
Contributions by employer |  |  | 0 | 0
Estimated employer contributions for remainder of fiscal year through year 5 | 0 |  | $ 0 |
TNMP | Pension Plan | Maximum |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |
Assumptions used calculating net periodic benefit cost, discount rate |  |  | 2.90% |
TNMP | OPEB Plan |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |
Service cost | 11,000 | 12,000 | $ 22,000 | 23,000
Interest cost | 77,000 | 93,000 | 154,000 | 187,000
Expected return on plan assets | (101,000) | (135,000) | (203,000) | (268,000)
Amortization of net loss | (81,000) | (80,000) | (161,000) | (162,000)
Amortization of prior service cost | 0 | 0 | 0 | 0
Net Periodic Benefit Cost (Income) | (94,000) | (110,000) | (188,000) | (220,000)
Contributions by employer | 0 | 0 | 0 | 0
Estimated employer contributions for remainder of fiscal year through year 5 | 0 |  | 0 |
TNMP | Executive Retirement Program |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |
Service cost | 0 | 0 | 0 | 0
Interest cost | 5,000 | 6,000 | 9,000 | 11,000
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of net loss | 8,000 | 6,000 | 17,000 | 12,000
Amortization of prior service cost | 0 | 0 | 0 | 0
Net Periodic Benefit Cost (Income) | 13,000 | 12,000 | 26,000 | 23,000
Expected employer disbursements for remainder of fiscal year | 100,000 |  | 100,000 |
Expected employer disbursements in year 2 through 5 | 300,000 |  | 300,000 |
TNMP | Executive Retirement Program | Maximum |  |  |  |
Components of Net Periodic Benefit Cost |  |  |  |
Disbursements by employer | $ 0 | $ 0 | $ 0 | $ 0

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