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Asset Retirement Obligations (Tables)
6 Months Ended
Jun. 30, 2018
Asset Retirement Obligation [Abstract]  
Schedule of Asset Retirement Obligations
The following table presents the AROs recorded on the Condensed Consolidated Balance Sheets.
 
June 30, 2018
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Decommissioning of Nuclear Power Facilities(a)
$
5,319

 
$
2,002

 
$
3,158

 
$
2,621

 
$
536

 
$

 
$

 
$

Closure of Ash Impoundments
4,843

 
1,761

 
2,202

 
2,178

 
24

 
44

 
836

 

Other
307

 
56

 
78

 
36

 
42

 
45

 
20

 
15

Total ARO
$
10,469

 
$
3,819

 
$
5,438

 
$
4,835

 
$
602

 
$
89

 
$
856

 
$
15

Less: current portion
716

 
227

 
386

 
381

 
5

 
5

 
98

 

Total noncurrent ARO
$
9,753


$
3,592


$
5,052


$
4,454


$
597


$
84


$
758

 
$
15

(a)    Duke Energy amount includes purchase accounting adjustments related to the merger with Progress Energy.
Schedule of Change in Asset Retirement Obligation
The following table presents the change in liability associated with AROs for the Duke Energy Registrants.
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Balance at December 31, 2017(a)
$
10,175

 
$
3,610

 
$
5,414

 
$
4,673

 
$
742

 
$
84

 
$
781

 
$
15

Accretion expense(b)
212

 
89

 
113

 
97

 
16

 
2

 
14

 

Liabilities settled(c)
(245
)
 
(114
)
 
(108
)
 
(89
)
 
(19
)
 
(2
)
 
(21
)
 

Liabilities incurred in the current year
8

 
8

 

 

 

 

 

 

Revisions in estimates of cash flows(d)
319

 
226

 
19

 
154

 
(137
)
 
5

 
82

 

Balance at June 30, 2018
$
10,469

 
$
3,819

 
$
5,438

 
$
4,835

 
$
602

 
$
89

 
$
856

 
$
15

(a)
Primarily relates to decommissioning nuclear power facilities, closure of ash impoundments, asbestos removal, closure of landfills at fossil generation facilities, retirement of natural gas mains and removal of renewable energy generation assets.
(b)
For the six months ended June 30, 2018, substantially all accretion expense relates to Duke Energy's regulated electric operations and has been deferred in accordance with regulatory accounting treatment.
(c)
Primarily relates to ash impoundment closures and nuclear decommissioning of Crystal River Unit 3.
(d)
Primarily relates to increases in groundwater monitoring estimates for closure of ash impoundments and a reduction for nuclear decommissioning at Crystal River Unit 3 compared to original estimates.