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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation [Line Items]  
Schedule of Asset Retirement Obligations by Category
The following table presents the AROs recorded on the Consolidated Balance Sheets.
 
December 31, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Decommissioning of Nuclear Power Facilities
$
5,072

 
$
1,730

 
$
3,093

 
$
2,349

 
$
744

 
$
—

 
$
—

Closure of Ash Impoundments
4,958

 
2,161

 
2,196

 
2,188

 
7

 
94

 
507

Other(a)
234

 
27

 
80

 
30

 
51

 
31

 
18

Total Asset retirement obligation
$
10,264

 
$
3,918

 
$
5,369

 
$
4,567

 
$
802

 
$
125

 
$
525

(a)
Includes obligations related to asbestos removal and the closure of certain landfills at fossil generation facilities. Duke Energy Ohio also includes AROs related to the retirement of natural gas mains. Duke Energy also includes AROs related to the removal of renewable energy generation assets.
Public Utilities General Disclosures
The following table presents the fair value of NDTF assets legally restricted for purposes of settling asset retirement obligations associated with nuclear decommissioning.
 
December 31,
(in millions)
2015
 
2014
Duke Energy
$
4,670

 
$
5,182

Duke Energy Carolinas
2,686

 
2,678

Duke Energy Progress(a)
1,984

 
1,701

Duke Energy Florida(a)(b)
—

 
803

(a)    Amounts for Progress Energy equal the sum of Duke Energy Progress and Duke Energy Florida.
(b)
Duke Energy Florida is actively decommissioning Crystal River Unit 3 and was granted an exemption from the NRC which allows for unrestricted use of the NDTF. Therefore, the entire balance of Duke Energy Florida’s NDTF may be applied towards license termination, spent fuel and site restoration costs incurred to decommission Crystal River Unit 3.
The following table summarizes information about the most recent site-specific nuclear decommissioning cost studies. Decommissioning costs in the table below are presented in dollars of the year of the cost study and include costs to decommission plant components not subject to radioactive contamination.
 
Annual Funding

 
Decommissioning

 
 
(in millions)
Requirement(a)

 
Costs(a)(b)

 
Year of Cost Study
Duke Energy
$
14

 
$
8,130

 
2013 and 2014
Duke Energy Carolinas
—

 
3,420

 
2013
Duke Energy Progress
14

 
3,550

 
2014
Duke Energy Florida
—

 
1,160

 
2013
(a)
Amounts for Progress Energy equal the sum of Duke Energy Progress and Duke Energy Florida.
(b)
Amounts include the Subsidiary Registrant's ownership interest in jointly owned reactors. Other joint owners are responsible for decommissioning costs related to their interest in the reactors.
The following table includes the current expiration of nuclear operating licenses. Duke Energy Florida has requested the NRC terminate the operating license for Crystal River Unit 3 as it permanently ceased operation in February 2013. Refer to Note 4 for further information on decommissioning activity and transition to SAFSTOR.
Unit
Year of Expiration
Duke Energy Carolinas
 
Catawba Units 1 and 2
2043
McGuire Unit 1
2041
McGuire Unit 2
2043
Oconee Units 1 and 2
2033
Oconee Unit 3
2034
Duke Energy Progress
 
Brunswick Unit 1
2036
Brunswick Unit 2
2034
Harris
2046
Robinson
2030
Rollforward Schedule of Asset Retirement Obligations
The following table presents changes in the liability associated with AROs.
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Balance at December 31, 2013
4,958

 
1,594

 
2,570

 
1,737

 
833

 
28

 
30

Acquisitions
4

 
—

 
—

 
—

 
—

 
—

 
—

Accretion expense(a)
246

 
113

 
135

 
97

 
38

 
2

 
2

Liabilities settled(b)  
(68
)
 
—

 
(68
)
 
—

 
(68
)
 
—

 
—

Liabilities incurred in the current year(c)
3,500

 
1,717

 
1,783

 
1,783

 
—

 
—

 
—

Revisions in estimates of cash flows(d)
(174
)
 
4

 
291

 
288

 
3

 
(3
)
 
—

Balance at December 31, 2014
8,466

 
3,428

 
4,711

 
3,905

 
806

 
27

 
32

Acquisitions(e)
226

 
—

 
226

 
204

 
23

 
—

 
—

Accretion expense(a)
384

 
165

 
203

 
169

 
34

 
4

 
15

Liabilities settled(b)  
(422
)
 
(200
)
 
(195
)
 
(125
)
 
(70
)
 
(4
)
 
(23
)
Liabilities incurred in the current year(c)
1,016

 
178

 
282

 
282

 
—

 
116

 
418

Revisions in estimates of cash flows(f)
594

 
347

 
142

 
132

 
9

 
(18
)
 
83

Balance at December 31, 2015
$
10,264


$
3,918


$
5,369


$
4,567


$
802


$
125


$
525

(a)
Substantially all accretion expense for the years ended December 31, 2015 and 2014 relates to Duke Energy’s regulated electric operations and has been deferred in accordance with regulatory accounting treatment.
(b)
For 2014, amounts relate to nuclear decommissioning of Crystal River Unit 3. For 2015, amounts primarily relate to ash impoundment closures and nuclear decommissioning of Crystal River Unit 3.
(c)
For 2014, amounts primarily relate to AROs recorded as a result of the Coal Ash Act and an agreement with the SCDHEC related to the W.S. Lee Steam Station. For 2015, amounts primarily relate to AROs recorded as a result of the EPA's rule for disposal of CCR.
(d)
Amounts for Progress Energy and Duke Energy Progress primarily relate to Duke Energy Progress' site-specific nuclear decommissioning cost studies. The Duke Energy amount also includes the impact of Duke Energy Progress' site-specific nuclear decommissioning cost studies on purchase accounting amounts.
(e)
Duke Energy Progress amount relates to the NCEMPA acquisition. See footnote 2 for additional information.
(f)
Primarily relates to the closure of ash impoundments.