Quarterly report pursuant to Section 13 or 15(d)

Leased Properties (Details 1)

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Leased Properties (Details 1) - Eastern Interconnect Project [Member]
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
kV
mi
Jun. 30, 2014
USD ($)
Sale Leaseback Transaction [Line Items]        
Length of transmission lines physical assets     216  
Power of transmission lines physical assets | kV     345  
Estimated useful lives of assets     20 years  
Amount of depreciation of leased property | $ $ 0 $ 570,000 $ 570,000 $ 1,100,000