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Regulatory Matters (Tables) | 3 Months Ended
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Mar. 31, 2022
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 March 31, 2022, and exclude capitalized asset retirement costs.
|  |  |  |  |  |  |  |  | Remaining Net |  |  |  |
| Capacity |  |  |  |  |  |  |  | Book Value |  |  |  |
| (in MW) |  |  |  |  |  |  |  | (in millions) |  |  |  |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |  |  |
Allen Steam Station Units 1(a) | 167 |  |  |  |  |  |  |  |  | $ | 12 |  |  |  |  |
Allen Steam Station Units 5(b) | 259 |  |  |  |  |  |  |  |  | 265 |  |  |  |  |
Cliffside Unit 5(b) | 546 |  |  |  |  |  |  |  |  | 358 |  |  |  |  |
Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |  |  |
Mayo Unit 1(b) | 713 |  |  |  |  |  |  |  |  | 621 |  |  |  |  |
Roxboro Units 3-4(b) | 1,409 |  |  |  |  |  |  |  |  | 450 |  |  |  |  |
Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |  |  |
Crystal River Units 4-5(c) | 1,442 |  |  |  |  |  |  |  |  | 1,636 |  |  |  |  |
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |  |  |  |
Gibson Units 1-5(d) | 2,845 |  |  |  |  |  |  |  |  | 2,076 |  |  |  |  |
Cayuga Units 1-2(d) | 1,005 |  |  |  |  |  |  |  |  | 676 |  |  |  |  |
Total Duke Energy | 8,386 |  |  |  |  |  |  |  |  | $ | 6,094 |  |  |  |  |
(a)As part of the 2015 resolution of a lawsuit involving alleged New Source Review violations, Duke Energy Carolinas must retire Allen Steam Station Unit 1 by December 31, 2024. The long-term energy options considered in the IRP could result in retirement of this unit earlier than its current estimated useful live. (b)These units were 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. (c)On January 14, 2021, Duke Energy Florida filed the 2021 Settlement agreement with the FPSC, which proposed depreciation rates reflecting retirement dates for Duke Energy Florida's last two coal-fired generating facilities, Crystal River Units 4-5, eight years ahead of schedule in 2034 rather than in 2042. The FPSC approved the 2021 Settlement on May 4, 2021. (d)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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