XML 109 R93.htm IDEA: XBRL DOCUMENT v3.25.3

Regulatory and Rate Matters - Schedule of Transmission Cost of Service Rates (Details) - PUCT - TNMP - USD ($) $ in Millions	Sep. 19, 2025	Mar. 25, 2025	Sep. 20, 2024	Mar. 15, 2024
Public Utilities, General Disclosures [Line Items]
Approved Increase in Rate Base	$ 87.4	$ 83.5	$ 20.6	$ 97.4
Annual Increase in Revenue	$ 12.3	$ 11.5	$ 3.9	$ 13.1

X

- Definition

Public Utilities, Increase Annual Transmission Service Revenue

+ References

No definition available.

+ Details

Name:	pnm_PublicUtilitiesIncreaseAnnualTransmissionServiceRevenue
Namespace Prefix:	pnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RegulatoryAgencyAxis=pnm_PUCTMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=pnm_TexasNewMexicoPowerCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: