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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