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Jointly-Owned Electric Plants (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017
 
Ownership
Interest
 
Gross
Investment(a)
 
Accumulated
Depreciation(a)
 
Construction
Work
in Progress
 
 
 
(millions)
FPL:
 
 
 
 
 
 
 
St. Lucie Unit No. 2
85
%
 
$
2,205

 
$
863

 
$
36

St. Johns River Power Park units (SJRPP) and coal terminal(b)
20
%
 
$
394

 
$
215

 
$
—

Scherer Unit No. 4
76
%
 
$
1,146

 
$
419

 
$
24

NEER:
 
 
 
 
 
 
 
Duane Arnold(c)
70
%
 
$
61

 
$
—

 
$
4

Seabrook
88.23
%
 
$
1,181

 
$
302

 
$
78

Wyman Station Unit No. 4
87.49
%
 
$
26

 
$
4

 
$
—

Corporate and Other:
 
 
 
 
 
 
 
Transmission substation assets located in Seabrook, New Hampshire
88.23
%
 
$
78

 
$
14

 
$
3

______________________
(a)
Excludes nuclear fuel.
(b)
SJRPP was shut down in January 2018. See Note 13 - Contracts.
(c)
Reflects impairment charge of $420 million pretax. See Note 4 - Nonrecurring Fair Value Measurements.