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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2025
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, 2025
|  |  | 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 | $ | 4,668 |  |  | $ | 2,158 |  |  | $ | 2,497 |  |  | $ | 2,428 |  |  | $ | 69 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Closure of ash impoundments | 4,607 |  |  | 1,610 |  |  | 1,838 |  |  | 1,814 |  |  | 24 |  |  | 64 |  |  | 1,095 |  |  | — |
Other | 350 |  |  | 74 |  |  | 151 |  |  | 47 |  |  | 104 |  |  | 71 |  |  | 30 |  |  | 25 |
Total asset retirement obligation | $ | 9,625 |  |  | $ | 3,842 |  |  | $ | 4,486 |  |  | $ | 4,289 |  |  | $ | 197 |  |  | $ | 135 |  |  | $ | 1,125 |  |  | $ | 25 |
Less: Current portion | 579 |  |  | 245 |  |  | 196 |  |  | 194 |  |  | 2 |  |  | 6 |  |  | 133 |  |  | — |
Total noncurrent asset retirement obligation | $ | 9,046 |  |  | $ | 3,597 |  |  | $ | 4,290 |  |  | $ | 4,095 |  |  | $ | 195 |  |  | $ | 129 |  |  | $ | 992 |  |  | $ | 25 |
Public Utilities General Disclosures | The following table summarizes information about the most recent site-specific nuclear decommissioning cost studies. Decommissioning costs are stated in 2023 or 2024 dollars, depending on the year of the cost study, and include costs to decommission plant components not subject to radioactive contamination.
|  |  | Decommissioning |  |
(in millions) |  |  | Costs |  | Year of Cost Study
Duke Energy |  |  | $ | 8,972 |  |  | 2023 and 2024
Duke Energy Carolinas(a) |  |  | 4,439 |  |  | 2023
Progress Energy |  |  | 4,533 |  |  | 2024
Duke Energy Progress(b) |  |  | 4,477 |  |  | 2024
Duke Energy Florida(c) |  |  | 56 |  |  | N/A
(a) Decommissioning costs for Duke Energy Carolinas reflect its ownership interest in jointly owned reactors. Other joint owners are responsible for decommissioning costs related to their interest in the reactors. Duke Energy Carolinas' site-specific nuclear decommissioning cost study and a funding study were filed with the NCUC and PSCSC in 2024. (b) Duke Energy Progress' site-specific nuclear decommissioning cost study and a funding study were filed with the NCUC and PSCSC in 2025. (c) During 2019, Duke Energy Florida reached an agreement to transfer decommissioning work for Crystal River Unit 3 to a third party and decommissioning costs are based on the agreement with this third party rather than a cost study. Regulatory approval was received from the NRC and the FPSC in April 2020 and August 2020, respectively. Duke Energy Florida provides the FPSC periodic reports on the status and progress of decommissioning activities. The following table presents the fair value of NDTF assets legally restricted for purposes of settling AROs associated with nuclear decommissioning. Duke Energy Florida entered into an agreement with a third party to decommission 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) | 2025 |  | 2024
Duke Energy | $ | 11,373 |  |  | $ | 10,044 |
Duke Energy Carolinas | 6,453 |  |  | 5,687 |
Progress Energy | 4,920 |  |  | 4,357 |
Duke Energy Progress | 4,920 |  |  | 4,357 |
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 | 2053
Oconee Unit 3 | 2054
Duke Energy Progress |
Brunswick Unit 1 | 2036
Brunswick Unit 2 | 2034
Harris | 2046
Robinson | 2030
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, 2023 | $ | 9,152 |  |  | $ | 4,013 |  |  | $ | 4,145 |  |  | $ | 3,870 |  |  | $ | 275 |  |  | $ | 136 |  |  | $ | 809 |  |  | $ | 21 |
Accretion expense(a) | 434 |  |  | 183 |  |  | 199 |  |  | 190 |  |  | 9 |  |  | 7 |  |  | 49 |  |  | 2 |
Liabilities settled(b) | (634) |  |  | (212) |  |  | (321) |  |  | (232) |  |  | (89) |  |  | (7) |  |  | (94) |  |  | — |
Liabilities incurred in the current year | 20 |  |  | 8 |  |  | 12 |  |  | — |  |  | 12 |  |  | — |  |  | — |  |  | — |
Revisions in estimates of cash flows(c) | 1,016 |  |  | (2) |  |  | 513 |  |  | 506 |  |  | 7 |  |  | 3 |  |  | 504 |  |  | 1 |
Balance at December 31, 2024 | 9,988 |  |  | 3,990 |  |  | 4,548 |  |  | 4,334 |  |  | 214 |  |  | 139 |  |  | 1,268 |  |  | 24 |
Accretion expense(a) | 474 |  |  | 188 |  |  | 219 |  |  | 211 |  |  | 8 |  |  | 7 |  |  | 65 |  |  | 1 |
Liabilities settled(b) | (584) |  |  | (227) |  |  | (245) |  |  | (203) |  |  | (42) |  |  | (6) |  |  | (106) |  |  | — |
Liabilities incurred in the current year | 18 |  |  | 1 |  |  | 17 |  |  | 5 |  |  | 12 |  |  | — |  |  | — |  |  | — |
Revisions in estimates of cash flows(c) | (271) |  |  | (110) |  |  | (53) |  |  | (58) |  |  | 5 |  |  | (5) |  |  | (102) |  |  | — |
Balance at December 31, 2025 | $ | 9,625 |  |  | $ | 3,842 |  |  | $ | 4,486 |  |  | $ | 4,289 |  |  | $ | 197 |  |  | $ | 135 |  |  | $ | 1,125 |  |  | $ | 25 |
(a) Substantially all accretion expense has been deferred in accordance with regulatory accounting treatment. (b) Amounts primarily relate to ash impoundment closures and nuclear decommissioning. (c) The amounts recorded represent the discounted cash flows for estimated closure costs as evaluated on a site-by-site basis. The increases in 2024 primarily relate to additional scope requirements to regulate the disposal of CCR in landfills and surface impoundments as a result of the 2024 CCR Rule, including an increase in groundwater monitoring wells. The decreases in 2025 primarily relate to lower third-party markup and a shift in timing of costs to future years.

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