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Electric plant, construction and related agreements: (Tables)
 12 Months Ended
Dec. 31, 2016
Electric plant, construction and related agreements:  
Summary of plant investments and related accumulated depreciation

 

                                                                                                                                                                                                         

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2016   

 

2015   

 

 

 

 

(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)

 

$
2,885,559

 

$
(1,712,642

)

$
2,869,142

 

$
(1,674,431

)

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

 

 
36,163

 

 
(1,567

)

 
22,557

 

 
(891

)

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

 

 
809,971

 

 
(407,400

)

 
767,019

 

 
(391,822

)

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

 

 
577,781

 

 
(190,974

)

 
499,180

 

 
(163,266

)

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

 

 
1,083,772

 

 
(368,948

)

 
1,086,435

 

 
(332,493

)

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

 

 
135,849

 

 
(102,642

)

 
124,051

 

 
(90,590

)

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

 

 
607,742

 

 
(234,765

)

 
600,640

 

 
(222,888

)

Hartwell (Combustion Turbine – 100% ownership)

 

 
227,878

 

 
(104,342

)

 
226,737

 

 
(103,111

)

Hawk Road (Combustion Turbine – 100% ownership)

 

 
250,595

 

 
(69,984

)

 
243,517

 

 
(70,832

)

Talbot (Combustion Turbine – 100% ownership)

 

 
290,790

 

 
(119,874

)

 
290,463

 

 
(111,617

)

Chattahoochee (Combined cycle – 100% ownership)

 

 
313,693

 

 
(123,946

)

 
310,788

 

 
(114,914

)

Smith (Combined cycle – 100% ownership)

 

 
614,453

 

 
(176,701

)

 
601,903

 

 
(166,324

)

Wansley (Combustion Turbine – 30% ownership)

 

 
3,582

 

 
(3,569

)

 
3,582

 

 
(3,513

)

Transmission plant

 

 
92,085

 

 
(53,251

)

 
90,195

 

 
(50,786

)

Other

 

 
99,644

 

 
(61,356

)

 
116,396

 

 
(73,442

)

Property under capital lease:

 

 


 

 

 


 

 

 


 

 

 


 

 

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

 

 
757,282

 

 
(383,378

)

 
743,543

 

 
(354,918

)

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Total in-service

 


$
8,786,839

 


$
(4,115,339


)


$
8,596,148

 


$
(3,925,838


)

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Construction work in progress

 

 


 

 

 


 

 

 


 

 

 


 

 

Vogtle Units No. 3 & No. 4

 

$
3,069,476

 

 

 

 

$
2,724,543

 

 

 

 

Environmental and other generation improvements

 

 
158,181

 

 

 

 

 
143,723

 

 

 

 

Other

 

 
557

 

 

 

 

 
403

 

 

 

 

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Total construction work in progress

 


$
3,228,214

 

 

 

 


$
2,868,669

 

 

 

 

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(1)          

Amounts include plant acquisition adjustments at December 31, 2016 and 2015 of $197,000,000.

(2)          

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