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Jointly-Owned Electric Plants (Tables)
 12 Months Ended
Dec. 31, 2016
Jointly-Owned Electric Plants [Abstract]  
Proportionate Ownership Interest In Jointly-Owned Facilities
NEE's and FPL's proportionate ownership interest in jointly-owned facilities is as follows:
 
December 31, 2016
 
Ownership
Interest
 
Gross
Investment(a)
 
Accumulated
Depreciation(a)
 
Construction
Work
in Progress
 
 
 
(millions)
FPL:
 
 
 
 
 
 
 
St. Lucie Unit No. 2
85
%
 
$
2,172

 
$
815

 
$
33

St. Johns River Power Park units and coal terminal
20
%
 
$
393

 
$
208

 
$
—

Scherer Unit No. 4
76
%
 
$
1,138

 
$
395

 
$
3

NEER:
 
 
 
 
 
 
 
Duane Arnold
70
%
 
$
466

 
$
146

 
$
16

Seabrook
88.23
%
 
$
1,138

 
$
271

 
$
77

Wyman Station Unit No. 4
84.35
%
 
$
25

 
$
3

 
$
—

Corporate and Other:
 
 
 
 
 
 
 
Transmission substation assets located in Seabrook, New Hampshire
88.23
%
 
$
76

 
$
17

 
$
3

______________________
(a)
Excludes nuclear fuel.