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Fair Value of Derivative and Other Financial Instruments - Schedule of Contingent Requirement to Provide Collateral (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Disclosures [Abstract] |  |
Contractual Liability | $ 0 | $ 15,288
Existing Cash Collateral | 0 | 0
Net Exposure | $ 0 | $ 13,087

X
- Definition Contract With Customer, Cash Collateral + References No definition available. + Details
Name: | pnm_ContractWithCustomerCashCollateral
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contract With Customer, Liability, Net + References No definition available. + Details
Name: | pnm_ContractWithCustomerLiabilityNet
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contract With Customer, Liability, Net Exposure + References No definition available. + Details
Name: | pnm_ContractWithCustomerLiabilityNetExposure
Namespace Prefix: | pnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration