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Dispositions	6 Months Ended
Dispositions	Jun. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Dispositions	Dispositions Upton 2 In May 2017, Con Edison Development sold Upton 2, a development stage solar electric production project, for $11 million to Vistra Asset Co. and recorded a $1 million gain on sale ($0.7 million, net of taxes). In addition, Con Edison Development agreed to perform the engineering, procurement and construction for the 180 MW (AC) project, which is expected to be substantially completed in 2018.