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Retirement of Generation Facilities - Narrative (Details)	Dec. 31, 2020 naturalGasFacility generationFacility
Coleto Creek | Sunset
Property, Plant and Equipment [Line Items]
Number of electric generation plants announced retirement | generationFacility	1
Joppa | Asset Closure
Property, Plant and Equipment [Line Items]
Number of electric generation plants announced retirement | naturalGasFacility	1

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- Definition

Number of Electric Generation Plants Announced Retirement

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