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Regulatory and Rate Matters - TNMP Narrative (Details) - USD ($) $ in Millions | Jul. 21, 2023 | May 26, 2023 | Sep. 24, 2022 | May 27, 2022 | Mar. 01, 2022
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Subsequent event |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Requested total rate base | $ 21.4 |  |  |  |
Requested total rate base, annual | $ 4.2 |  |  |  |
TNMP |  |  |  |  |
Public Utilities, Commitments And Contingencies [Line Items] |  |  |  |  |
Energy efficiency cost recovery, requested change amount |  | $ 6.6 |  | $ 1.9 | $ 7.2
Energy efficiency cost recovery, requested bonus |  | $ 1.2 |  | $ 7.4 | $ 2.3
Energy efficiency cost recovery factor, approved settlement amount |  |  | $ 7.3 |  |
Energy efficiency cost recovery factor, approved performance bonus |  |  | $ 1.9 |  |

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- Definition Energy Efficiency Cost Recovery Factor, Approved Performance Bonus + References No definition available. + Details
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- Definition Energy Efficiency Cost Recovery Factor, Requested Change Amount + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Energy Efficiency Cost Recovery Factor, Requested Performance Bonus + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Energy Efficiency Cost Recovery Factor, Settlement Amount + References No definition available. + Details
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Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Public Utilities, Commitments And Contingencies [Line Items] + References No definition available. + Details
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- Definition Public Utilities, Requested Total Rate Base + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |