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Electric plant, construction and related agreements: (Tables)
 12 Months Ended
Dec. 31, 2013
Electric plant, construction and related agreements:  
Summary of plant investments and related accumulated depreciation
   

 

   2013     2012    

 

     (dollars in thousands)  

Plant

     Investment     Accumulated
Depreciation		     Investment     Accumulated
Depreciation		  
   

In-service(1)

                          

Owned property

                          

Vogtle Units No. 1 & No. 2
(Nuclear – 30% ownership)

   $ 2,778,941   $ (1,602,942 ) $ 2,745,800   $ (1,566,133 )

Vogtle Unit No. 3 & No. 4
(Nuclear – 30% ownership)

     12,073     (338 )   8,956     (147 )

Hatch Units No. 1 & No. 2
(Nuclear – 30% ownership)

     679,373     (367,757 )   645,722     (361,554 )

Wansley Units No. 1 & No. 2
(Fossil – 30% ownership)

     441,590     (149,594 )   441,340     (147,890 )

Scherer Unit No. 1
(Fossil – 60% ownership)

     889,094     (306,027 )   696,223     (288,701 )

Rocky Mountain Units No. 1, No. 2 & No. 3
(Hydro – 75% ownership)

     587,312     (199,386 )   585,133     (187,763 )

Hartwell (Combustion Turbine – 100% ownership)

     224,384     (94,258 )   224,374     (89,822 )

Hawk Road (Combustion Turbine – 100% ownership)

     242,757     (61,846 )   243,963     (56,593 )

Talbot (Combustion Turbine – 100% ownership)

     281,271     (94,399 )   281,009     (86,000 )

Chattahoochee (Combined cycle – 100% ownership)

     306,953     (97,392 )   301,246     (88,272 )

Smith (Combined cycle – 100% ownership)

     561,704     (137,626 )   553,942     (123,575 )

Wansley (Combustion Turbine – 30% ownership)

     3,636     (3,309 )   3,624     (3,161 )

Transmission plant

     86,088     (47,286 )   84,801     (45,381 )

Other

     111,887     (62,904 )   109,461     (67,415 )

Property under capital lease:

    
 		    
 		    
 		    
 		  

Doyle (Combustion Turbine – 100% leasehold)

     126,990     (92,944 )   126,990     (82,546 )

Scherer Unit No. 2 (Fossil – 60% leasehold)

     716,050     (297,367 )   454,123     (277,134 )
   

Total in-service

  
$
8,050,103		  
$
(3,615,375
)
$
7,506,707		  
$
(3,472,087
)
   

Construction work in progress

    
 		    
 		    
 		    
 		  

Vogtle Unit No. 3 & No. 4

   $ 1,940,340         $ 1,613,791        

Environmental and other generation improvements

     270,446           626,264        

Other

     1,438           865        
   

Total construction work in progress

  
$
2,212,224		        
$
2,240,920		        
   
(1)
Amounts include plant acquisition adjustments at December 31, 2013 and 2012 of $196,000,000 and $196,000,000, respectively.