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Pension and Other Postretirement Benefit Plans (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
PNM | Pension Plan |  |
Components of Net Periodic Benefit Cost |  |
Service cost | $ 0 | $ 0
Interest cost | 6,294,000 | 6,068,000
Expected return on plan assets | (8,527,000) | (8,672,000)
Amortization of net (gain) loss | 3,880,000 | 4,087,000
Amortization of prior service cost | (241,000) | (241,000)
Net Periodic Benefit Cost | 1,406,000 | 1,242,000
Contributions by employer | 0 | 0
Expected employer contributions for future fiscal years | 0 |
Expected employer contributions in year 5 | 1,300,000 |
Expected employer contributions in year 6 | $ 22,900,000 |
PNM | Pension Plan | Minimum |  |
Components of Net Periodic Benefit Cost |  |
Assumptions used calculating net periodic benefit cost, discount rate | 4.20% |
PNM | Pension Plan | Maximum |  |
Components of Net Periodic Benefit Cost |  |
Assumptions used calculating net periodic benefit cost, discount rate | 4.60% |
PNM | OPEB Plan |  |
Components of Net Periodic Benefit Cost |  |
Service cost | $ 13,000 | 21,000
Interest cost | 829,000 | 860,000
Expected return on plan assets | (1,318,000) | (1,353,000)
Amortization of net (gain) loss | 169,000 | 588,000
Amortization of prior service cost | (99,000) | (416,000)
Net Periodic Benefit Cost | (406,000) | (300,000)
Contributions by employer | 0 | 0
PNM | Executive Retirement Program |  |
Components of Net Periodic Benefit Cost |  |
Service cost | 0 | 0
Interest cost | 162,000 | 155,000
Expected return on plan assets | 0 | 0
Amortization of net (gain) loss | 79,000 | 90,000
Amortization of prior service cost | 0 | 0
Net Periodic Benefit Cost | 241,000 | 245,000
Contributions by employer | 400,000 | 500,000
Total expected employer contributions for fiscal year | 1,500,000 |
Estimated employer contributions in Year 2-5 | 5,600,000 |
TNMP | Pension Plan |  |
Components of Net Periodic Benefit Cost |  |
Service cost | 0 | 0
Interest cost | 672,000 | 656,000
Expected return on plan assets | (967,000) | (991,000)
Amortization of net (gain) loss | 235,000 | 272,000
Amortization of prior service cost | 0 | 0
Net Periodic Benefit Cost | (60,000) | (63,000)
Contributions by employer | 0 | 0
Estimated employer contributions in Year 2-5 | $ 0 |
TNMP | Pension Plan | Minimum |  |
Components of Net Periodic Benefit Cost |  |
Assumptions used calculating net periodic benefit cost, discount rate | 4.20% |
TNMP | Pension Plan | Maximum |  |
Components of Net Periodic Benefit Cost |  |
Assumptions used calculating net periodic benefit cost, discount rate | 4.60% |
TNMP | OPEB Plan |  |
Components of Net Periodic Benefit Cost |  |
Service cost | $ 13,000 | 33,000
Interest cost | 113,000 | 119,000
Expected return on plan assets | (129,000) | (135,000)
Amortization of net (gain) loss | (110,000) | (56,000)
Amortization of prior service cost | 0 | 0
Net Periodic Benefit Cost | (113,000) | (39,000)
Contributions by employer | 0 | 300,000
TNMP | Executive Retirement Program |  |
Components of Net Periodic Benefit Cost |  |
Service cost | 0 | 0
Interest cost | 8,000 | 7,000
Expected return on plan assets | 0 | 0
Amortization of net (gain) loss | 4,000 | 4,000
Amortization of prior service cost | 0 | 0
Net Periodic Benefit Cost | 12,000 | 11,000
Total expected employer contributions for fiscal year | 100,000 |
Estimated employer contributions in Year 2-5 | 300,000 |
TNMP | Executive Retirement Program | Maximum |  |
Components of Net Periodic Benefit Cost |  |
Contributions by employer | $ 100,000 | $ 100,000

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