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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)	Jun. 30, 2024
Weighted average remaining lease term (years):
Operating leases	16 years 7 months 6 days
Financing leases	3 years 3 months
Weighted average discount rate:
Operating leases	5.64%
Financing leases	4.87%
PNM
Weighted average remaining lease term (years):
Operating leases	16 years 8 months 26 days
Financing leases	3 years 6 months 14 days
Weighted average discount rate:
Operating leases	5.65%
Financing leases	4.77%
TNMP
Weighted average remaining lease term (years):
Operating leases	1 year 4 months 28 days
Financing leases	2 years 11 months 12 days
Weighted average discount rate:
Operating leases	4.26%
Financing leases	4.96%

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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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