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Regulatory and Rate Matters - SJGS Abandonment Application (Details) - San Juan Generating Station - PNM $ in Millions	Jul. 01, 2019 USD ($) scenario MW
Public Utilities, General Disclosures [Line Items]
Number of megawatts in natural gas-fired peaking plant (in megawatts) | MW	280
Number of megawatts in battery storage facilities (in megawatts) | MW	70
Solar generation capacity (in megawatts) | MW	350
Number of megawatts in battery storage facilities, replacement resource scenario (in megawatts) | MW	60
Number of replacement resource scenarios | scenario	3
Request issuance of energy transition bonds	$ 361.0
Forecasted undepreciated investment	283.0
Plant decommissioning and coal mine reclamation costs	28.6
Upfront financing costs	9.6
Severance costs	20.0
Proceeds from securitization bonds	$ 19.8

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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