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Pension and Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
PNM | Pension Plan |  |
Components of Net Periodic Benefit Cost |  |
Service cost | $ 0 | $ 0
Interest cost | 5,385 | 5,427
Expected return on plan assets | (7,458) | (7,757)
Amortization of net (gain) loss | 3,123 | 2,661
Amortization of prior service cost | 0 | 0
Net Periodic Benefit Cost (Income) | 1,050 | 331
PNM | OPEB Plan |  |
Components of Net Periodic Benefit Cost |  |
Service cost | 0 | 0
Interest cost | 567 | 597
Expected return on plan assets | (1,384) | (1,391)
Amortization of net (gain) loss | 0 | 0
Amortization of prior service cost | 0 | 0
Net Periodic Benefit Cost (Income) | (817) | (794)
PNM | Executive Retirement Program |  |
Components of Net Periodic Benefit Cost |  |
Service cost | 0 | 0
Interest cost | 122 | 124
Expected return on plan assets | 0 | 0
Amortization of net (gain) loss | 47 | 50
Amortization of prior service cost | 0 | 0
Net Periodic Benefit Cost (Income) | 169 | 174
Texas-New Mexico Power Company | Pension Plan |  |
Components of Net Periodic Benefit Cost |  |
Service cost | 0 | 0
Interest cost | 536 | 553
Expected return on plan assets | (733) | (687)
Amortization of net (gain) loss | 168 | 139
Amortization of prior service cost | 0 | 0
Net Periodic Benefit Cost (Income) | (29) | 5
Texas-New Mexico Power Company | OPEB Plan |  |
Components of Net Periodic Benefit Cost |  |
Service cost | 4 | 5
Interest cost | 93 | 96
Expected return on plan assets | (120) | (129)
Amortization of net (gain) loss | (124) | (161)
Amortization of prior service cost | 0 | 0
Net Periodic Benefit Cost (Income) | (147) | (189)
Texas-New Mexico Power Company | Executive Retirement Program |  |
Components of Net Periodic Benefit Cost |  |
Service cost | 0 | 0
Interest cost | 0 | 4
Expected return on plan assets | 0 | 0
Amortization of net (gain) loss | 0 | 0
Amortization of prior service cost | 0 | 0
Net Periodic Benefit Cost (Income) | $ 0 | $ 4

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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