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Regulatory and Rate Matters - Transportation and Electrification Program (TEP) (Narrative) (Details) - PNM - USD ($) $ in Millions	Feb. 23, 2024	Jun. 01, 2023
Public Utilities, General Disclosures [Line Items]
Expected budgeted expenditures	$ 4.0	$ 37.1
Budget period	3 years	3 years
Budge dedication to low-income customers		22.00%
Budget dedication to low-income customers		$ 8.0
Revised budget	$ 32.9

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