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Regulatory Environment - MGU and UMERC (Details) - UMERC $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2016 MW | Dec. 31, 2019 USD ($)
Public Utilities, General Disclosures [Line Items] |  |
Electric Power Purchase Agreement Term with Tilden | 20 years |
Capacity of UMERC Generation | MW | 180 |
Cost to Construct UMERC Generation |  | $ 242
Cost to Construct UMERC Generation with AFUDC |  | $ 255
Cost of Rice Units to be recovered from Utility Customers |  | 50.00%
Cost of Rice Units to be recovered from Tilden |  | 50.00%

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