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Regulatory and Rate Matters - 2025 Rate Request (Narrative) (Details) - 2025 Rate Request - USD ($) $ in Millions	Nov. 26, 2024	Jun. 14, 2024
Public Utilities, General Disclosures [Line Items]
Requested return on equity	9.45%	10.45%
Requested equity capital structure, percentage	51.00%	52.50%
PNM
Public Utilities, General Disclosures [Line Items]
Recovery of base rate		$ 3,000.0
Requested rate increase (decrease)	$ 105.0	174.3
Increase in base rate	$ 82.1	92.2
Increase in revenues from FPPAC		$ 82.1

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