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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)	Sep. 30, 2024
Weighted average remaining lease term (years):
Operating leases	16 years 4 months 2 days
Financing leases	3 years 1 month 24 days
Weighted average discount rate:
Operating leases	5.64%
Financing leases	5.00%
PNM
Weighted average remaining lease term (years):
Operating leases	16 years 5 months 15 days
Financing leases	3 years 4 months 28 days
Weighted average discount rate:
Operating leases	5.64%
Financing leases	4.89%
TNMP
Weighted average remaining lease term (years):
Operating leases	1 year 3 months 21 days
Financing leases	2 years 10 months 9 days
Weighted average discount rate:
Operating leases	4.39%
Financing leases	5.10%

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Weighted average discount rate for finance lease calculated at point in time.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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