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Lease Commitments - Schedule of Weighted Average Remaining Lease Terms and Discount Rates (Details)	Jun. 30, 2025	Dec. 31, 2024
Weighted average remaining lease term (years):
Operating leases	17 years 3 months 3 days	17 years 5 months 12 days
Financing leases	3 years 2 months 23 days	3 years 2 months 12 days
Weighted average discount rate:
Operating leases	5.70%	5.68%
Financing leases	5.33%	5.12%
PNM
Weighted average remaining lease term (years):
Operating leases	17 years 3 months 18 days	17 years 6 months 7 days
Financing leases	3 years 3 months 21 days	3 years 6 months 3 days
Weighted average discount rate:
Operating leases	5.70%	5.68%
Financing leases	5.26%	5.08%
TNMP
Weighted average remaining lease term (years):
Operating leases	8 months 1 day	1 year 1 month 6 days
Financing leases	3 years 1 month 28 days	2 years 9 months 18 days
Weighted average discount rate:
Operating leases	4.46%	4.41%
Financing leases	5.43%	5.19%

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

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