XML 97 R45.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Asset Retirement Obligations (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Asset Retirement Obligations by Category | The following table presents the AROs recorded on the Consolidated Balance Sheets.
| December 31, 2019
|  |  | 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) | $ | 6,633 |  |  | $ | 2,551 |  |  | $ | 4,028 |  |  | $ | 3,499 |  |  | $ | 529 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Closure of ash impoundments | 6,333 |  |  | 3,118 |  |  | 2,368 |  |  | 2,352 |  |  | 16 |  |  | 41 |  |  | 805 |  |  | — |
Other | 352 |  |  | 65 |  |  | 75 |  |  | 42 |  |  | 33 |  |  | 39 |  |  | 27 |  |  | 17 |
Total asset retirement obligation | $ | 13,318 |  |  | $ | 5,734 |  |  | $ | 6,471 |  |  | $ | 5,893 |  |  | $ | 578 |  |  | $ | 80 |  |  | $ | 832 |  |  | $ | 17 |
Less: current portion | 881 |  |  | 206 |  |  | 485 |  |  | 485 |  |  | — |  |  | 1 |  |  | 189 |  |  | — |
Total noncurrent asset retirement obligation | $ | 12,437 |  |  | $ | 5,528 |  |  | $ | 5,986 |  |  | $ | 5,408 |  |  | $ | 578 |  |  | $ | 79 |  |  | $ | 643 |  |  | $ | 17 |
(a) Duke Energy amount includes purchase accounting adjustments related to the merger with Progress Energy.
Public Utilities General Disclosures | The following table includes the current expiration of nuclear operating licenses.
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
The following table presents the fair value of NDTF assets legally restricted for purposes of settling AROs associated with nuclear decommissioning. Duke Energy Florida is actively decommissioning Crystal River Unit 3 and was granted an exemption from the NRC, which allows for use of the NDTF for all aspects of nuclear decommissioning. The entire balance of Duke Energy Florida's NDTF may be applied toward license termination, spent fuel and site restoration costs incurred to decommission Crystal River Unit 3 and is excluded from the table below. See Note 17 for additional information related to the fair value of the Duke Energy Registrants' NDTFs.
| December 31,
(in millions) | 2019 |  | 2018
Duke Energy | $ | 6,766 |  |  | $ | 5,579 |
Duke Energy Carolinas | 3,837 |  |  | 3,133 |
Duke Energy Progress | 2,929 |  |  | 2,446 |
The following table summarizes information about the most recent site-specific nuclear decommissioning cost studies. Decommissioning costs are stated in 2018 or 2019 dollars, depending on 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) |  |  | Year of Cost Study
Duke Energy | $ | 24 |  |  | $ | 9,152 |  |  | 2018 and 2019
Duke Energy Carolinas(b)(c) | — |  |  | 4,365 |  |  | 2018
Duke Energy Progress(d) | 24 |  |  | 4,181 |  |  | 2019
Duke Energy Florida(e) | — |  |  | 606 |  |  | 2019
(a) | Amounts for Progress Energy equal the sum of Duke Energy Progress and Duke Energy Florida.
(b) | Decommissioning cost for Duke Energy Carolinas reflects its ownership interest in jointly owned reactors. Other joint owners are responsible for decommissioning costs related to their interest in the reactors.
(c) | Duke Energy Carolinas' site-specific nuclear decommissioning cost study completed in 2018 was filed with the NCUC and PSCSC in 2019. A new funding study was also completed and filed with the NCUC and PSCSC in 2019.
(d) | Duke Energy Progress' site-specific nuclear decommissioning cost study completed in 2019 is expected to be filed with the NCUC and PSCSC during the first quarter 2020. Duke Energy Progress will also complete a new funding study, which will be completed and filed with the NCUC and PSCSC in July 2020.
(e) During 2019, Duke Energy Florida reached an agreement to transfer decommissioning work for Crystal River Unit 3 to a third party. The agreement requires regulatory approval from the NRC and the FPSC.
Rollforward Schedule of Asset Retirement Obligations | The following tables present 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 |  |  | Piedmont |
Balance at December 31, 2017 | $ | 10,175 |  |  | $ | 3,610 |  |  | $ | 5,414 |  |  | $ | 4,673 |  |  | $ | 742 |  |  | $ | 84 |  |  | $ | 781 |  |  | $ | 15 |
Accretion expense(a) | 427 |  |  | 179 |  |  | 225 |  |  | 196 |  |  | 29 |  |  | 4 |  |  | 29 |  |  | 1 |
Liabilities settled(b) | (638 | ) |  | (281 | ) |  | (272 | ) |  | (227 | ) |  | (45 | ) |  | (5 | ) |  | (79 | ) |  | — |
Liabilities incurred in the current year(c) | 39 |  |  | 8 |  |  | 5 |  |  | — |  |  | 5 |  |  | — |  |  | 25 |  |  | — |
Revisions in estimates of cash flows | 464 |  |  | 433 |  |  | 39 |  |  | 178 |  |  | (140 | ) |  | 10 |  |  | (34 | ) |  | 3 |
Balance at December 31, 2018 | 10,467 |  |  | 3,949 |  |  | 5,411 |  |  | 4,820 |  |  | 591 |  |  | 93 |  |  | 722 |  |  | 19 |
Accretion expense(a) | 508 |  |  | 235 |  |  | 252 |  |  | 227 |  |  | 25 |  |  | 3 |  |  | 28 |  |  | 1 |
Liabilities settled(b) | (895 | ) |  | (329 | ) |  | (499 | ) |  | (460 | ) |  | (39 | ) |  | (12 | ) |  | (54 | ) |  | — |
Liabilities incurred in the current year | 25 |  |  | 18 |  |  | 7 |  |  | — |  |  | 7 |  |  | — |  |  | — |  |  | — |
Revisions in estimates of cash flows(d) | 3,213 |  |  | 1,861 |  |  | 1,300 |  |  | 1,306 |  |  | (6 | ) |  | (4 | ) |  | 136 |  |  | (3 | )
Balance at December 31, 2019 | $ | 13,318 |  |  | $ | 5,734 |  |  | $ | 6,471 |  |  | $ | 5,893 |  |  | $ | 578 |  |  | $ | 80 |  |  | $ | 832 |  |  | $ | 17 |
(a) | Substantially all accretion expense for the years ended December 31, 2019, and 2018, relates to Duke Energy’s regulated operations and has been deferred in accordance with regulatory accounting treatment.
(b) | Amounts primarily relate to ash impoundment closures and nuclear decommissioning of Crystal River Unit 3.
(c) | Amounts primarily relate to AROs recorded as a result of state agency closure requirements at Duke Energy Indiana.
(d) Amounts primarily relate to increases in closure estimates for certain ash impoundments as a result of the NCDEQ's April 1 Order and the related settlement agreement dated December 31, 2019. See Note 5 for more information. The amount recorded in the fourth quarter of 2019 for coal ash closures as a result of the settlement was not material.

X
- References No definition available. + Details
Name: | us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of regulation for public utility entities, including, but not limited to, rate requests, decommissioning costs and the amount of allowance for earnings on equity capitalized for rate making purposes. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesGeneralDisclosuresTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_ScheduleOfAssetRetirementObligationsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration