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Concentrations and Associated Credit Risk (Tables)
9 Months Ended
Sep. 30, 2018
Revenues [Member]  
Concentration Risk [Line Items]  
Schedule of concentration risk
  Nine Months Ended
September 30,
 
  2018  2017 
Con Edison  12%  16%
ComEd  na   11%

 

na-less than 10% of consolidated revenue in the period

Accounts receivable [Member]  
Concentration Risk [Line Items]  
Schedule of concentration risk
  

September 30,

2018

  

December 31,

2017

 
Con Edison  12%  11%