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Electric plant, construction and related agreements: (Tables)
 12 Months Ended
Dec. 31, 2015
Electric plant, construction and related agreements:  
Summary of plant investments and related accumulated depreciation

                                                                                                                                                                                    

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2015   

 

2014   

 

 

 

 

(dollars in thousands)

 

Plant

 

 

Investment

 

 

Accumulated
Depreciation

 

 

Investment

 

 

Accumulated
Depreciation

 

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In-service(1)

 

 

 

 

 

 

 

 

 

 

 

 

 

Owned property

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

$
2,869,142

 

$
(1,674,431

)

$
2,805,310

 

$
(1,634,062

)

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

 

 
22,557

 

 
(891

)

 
18,267

 

 
(637

)

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

 

 
767,019

 

 
(391,822

)

 
695,392

 

 
(377,902

)

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

 

 
499,180

 

 
(163,266

)

 
474,740

 

 
(157,543

)

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

 

 
1,086,435

 

 
(332,493

)

 
1,067,777

 

 
(318,990

)

Doyle (Combustion Turbine – 100% leasehold)(2)

 

 
124,051

 

 
(90,590

)

 
126,990

 

 
(95,644

)

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

 

 
600,640

 

 
(222,888

)

 
587,762

 

 
(211,010

)

Hartwell (Combustion Turbine – 100% ownership)

 

 
226,737

 

 
(103,111

)

 
224,512

 

 
(98,696

)

Hawk Road (Combustion Turbine – 100% ownership)

 

 
243,517

 

 
(70,832

)

 
242,293

 

 
(65,931

)

Talbot (Combustion Turbine – 100% ownership)

 

 
290,463

 

 
(111,617

)

 
289,020

 

 
(102,947

)

Chattahoochee (Combined cycle – 100% ownership)

 

 
310,788

 

 
(114,914

)

 
308,943

 

 
(106,633

)

Smith (Combined cycle – 100% ownership)

 

 
601,903

 

 
(166,324

)

 
579,486

 

 
(151,677

)

Wansley (Combustion Turbine – 30% ownership)

 

 
3,582

 

 
(3,513

)

 
3,582

 

 
(3,377

)

Transmission plant

 

 
90,195

 

 
(50,786

)

 
88,031

 

 
(49,132

)

Other

 

 
116,396

 

 
(73,442

)

 
112,431

 

 
(63,427

)

Property under capital lease:

 

 


 

 

 


 

 

 


 

 

 


 

 

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

 

 
743,543

 

 
(354,918

)

 
720,705

 

 
(325,082

)

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Total in-service

 


$
8,596,148

 


$
(3,925,838


)


$
8,345,241

 


$
(3,762,690


)

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Construction work in progress

 

 


 

 

 


 

 

 


 

 

 


 

 

Vogtle Units No. 3 & No. 4

 

$
2,724,543

 

 

 

 

$
2,268,344

 

 

 

 

Environmental and other generation improvements

 

 
143,723

 

 

 

 

 
104,600

 

 

 

 

Other

 

 
403

 

 

 

 

 
1,448

 

 

 

 

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Total construction work in progress

 


$
2,868,669

 

 

 

 


$
2,374,392

 

 

 

 

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(1)          

Amounts include plant acquisition adjustments at December 31, 2015 and 2014 of $196,000,000.

(2)          

On August 20, 2015, we acquired Doyle which we previously operated under a capital lease.