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Asset Retirement Obligations (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Asset Retirement Obligations [Line Items] |  |  |
ARO liabilities related to nuclear decommissioning (as a percent) | 75.70% |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Beginning balance | $ 245,531 | $ 223,377 | $ 234,146
Liabilities incurred | 0 | 0 | 0
Liabilities settled | (12,451) | (3,482) | 0
Accretion expense | 11,538 | 10,218 | 10,767
Revisions to estimated cash flows | 0 | 15,418 | (21,536)
Ending balance | 244,618 | 245,531 | 223,377
San Juan Generating Station |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Revisions to estimated cash flows |  |  | (21,500)
PVNGS (Nuclear) |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Revisions to estimated cash flows |  | 15,400 |
PNM |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Beginning balance | 244,633 | 222,549 | 233,383
Liabilities incurred | 0 | 0 | 0
Liabilities settled | (12,432) | (3,482) | 0
Accretion expense | 11,462 | 10,148 | 10,702
Revisions to estimated cash flows | 0 | 15,418 | (21,536)
Ending balance | 243,663 | 244,633 | 222,549
TNMP |  |  |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |  |
Beginning balance | 898 | 828 | 763
Liabilities incurred | 0 | 0 | 0
Liabilities settled | (19) | 0 | 0
Accretion expense | 76 | 70 | 65
Revisions to estimated cash flows | 0 | 0 | 0
Ending balance | $ 955 | $ 898 | $ 828

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- Definition Asset Retirement Obligation, Liabilities Related To Nuclear Decommissioning + References No definition available. + Details
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- Definition Asset Retirement Obligations [Line Items] + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481999/410-20-25-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481879/410-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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