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Regulatory Matters (Tables) | 6 Months Ended
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Jun. 30, 2019
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 June 30, 2019, 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) | 585 |  |  | 156 |
Duke Energy Indiana |  |  |
Gallagher Units 2 and 4(b) | 280 |  |  | 118 |
Gibson Units 1-5(c) | 3,132 |  |  | 1,960 |
Cayuga Units 1-2(c) | 1,005 |  |  | 983 |
Total Duke Energy | 5,002 |  |  | $ | 3,217 |
(a) | Duke Energy Carolinas will retire Allen Steam Station Units 1 through 3 by December 31, 2024, as part of the resolution of a lawsuit involving alleged New Source Review violations.
(b) | 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.
(c) 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, includes proposed depreciation rates reflecting retirement dates from 2026 to 2038.

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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=6877327&loc=d3e13212-122682 + Details
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