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Property, Plant and Equipment (Schedule of Nonregulated Solar Projects) (Parenthetical) (Detail) - MW | 1 Months Ended
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Jan. 31, 2021 | Dec. 31, 2020
Acquisition of Solar Project Hardin I in Ohio |  |
Property Plant And Equipment [Line Items] |  |
Capacity of project commenced commercial operations | 53 | 97

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