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Summary of the Business and Significant Accounting Policies - Inventories/Depreciation and Amortization (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Public Utilities, Inventory [Line Items] |  |  |
Inventory | $ 66,733 | $ 65,061 |
Coal |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory | 985 | 2,973 |
Materials and supplies |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory | 65,748 | 62,088 |
Public Service Company of New Mexico |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory | 55,890 | 57,942 |
Public Service Company of New Mexico | Coal |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory | 985 | 2,973 |
Public Service Company of New Mexico | Materials and supplies |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory | $ 54,905 | $ 54,969 |
Public Service Company of New Mexico | Electric plant |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Depreciation average rates used | 2.55% | 2.48% | 2.47%
Public Service Company of New Mexico | Common, intangible, and general plant |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Depreciation average rates used | 7.83% | 7.91% | 7.65%
Texas-New Mexico Power Company |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Depreciation average rates used | 3.72% | 3.88% | 3.95%
Inventory | $ 10,843 | $ 7,119 |
Texas-New Mexico Power Company | Coal |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory | 0 | 0 |
Texas-New Mexico Power Company | Materials and supplies |  |  |
Public Utilities, Inventory [Line Items] |  |  |
Inventory | $ 10,843 | $ 7,119 |

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- Definition Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 + Details
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