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Regulatory Matters (Tables) | 9 Months Ended
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Sep. 30, 2020
Regulated Operations [Abstract] |
Schedule of Potential Plant Retirements | The table below contains the net carrying value of generating facilities planned for retirement or included in recent IRPs as evaluated for potential retirement. Dollar amounts in the table below are included in Net property, plant and equipment on the Condensed Consolidated Balance Sheets as of September 30, 2020, and exclude capitalized asset retirement costs.
|  |  | Remaining Net |
| Capacity |  |  | Book Value |
| (in MW) |  |  | (in millions) |
Duke Energy Carolinas |  |  |
Allen Steam Station Units 1-3(a) | 582 |  |  | $ | 141 |
Allen Steam Station Units 4-5(b) | 516 |  |  | 321 |
Cliffside Unit 5(b) | 544 |  |  | 355 |
Duke Energy Progress |  |  |
Mayo Unit 1(b) | 727 |  |  | 673 |
Roxboro Units 3-4(b) | 1,392 |  |  | 486 |
Duke Energy Indiana |  |  |
Gallagher Units 2 and 4(c) | 280 |  |  | 112 |
Gibson Units 1-5(d) | 3,132 |  |  | 1,683 |
Cayuga Units 1-2(d) | 1,005 |  |  | 935 |
Total Duke Energy | 8,178 |  |  | $ | 4,706 |
(a) | As part of the 2015 resolution of a lawsuit involving alleged New Source Review violations, Duke Energy Carolinas must retire Allen Steam Station Units 1 through 3 by December 31, 2024. The long-term energy options considered in the IRP could result in retirement of these units earlier than their current estimated useful lives.
(b) | These units are included in the IRP filed by Duke Energy Carolinas and Duke Energy Progress in North Carolina and South Carolina on September 1, 2020. The long-term energy options considered in the IRP could result in retirement of these units earlier than their current estimated useful lives. In 2019, Duke Energy Carolinas and Duke Energy Progress filed North Carolina rate cases that included depreciation studies that accelerate end of life dates for these plants. A decision by NCUC is expected by the end of the first quarter 2021.
(c) | Duke Energy Indiana committed to either retire or stop burning coal at Gallagher units 2 and 4 by December 31, 2022, as part of the 2016 settlement of Edwardsport IGCC matters.
(d) On July 1, 2019, Duke Energy Indiana filed its 2018 IRP with the IURC. The 2018 IRP included scenarios evaluating the potential retirement of coal-fired generating units at Gibson and Cayuga. The rate case filed July 2, 2019, included proposed depreciation rates reflecting retirement dates from 2026 to 2038. The depreciation rates reflecting these updated retirement dates were approved by the IURC as part of the rate case order issued on June 29, 2020.

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- Definition Tabular disclosure of public utility physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, deprecation expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167750&loc=d3e42232-110370 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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