DUK Legal Proceedings

, including regulatory and environmental matters, see Note 4, "Regulatory Matters," and Note 5, "Commitments and Contingencies," to the Condensed Consolidated Financial Statements. For additional information, see Item 3, "Legal Proceedings," in Duke Energy's Annual Report on Form 10-K for the year ended December 31, 2024.For open litigation, unless otherwise noted, Duke Energy cannot predict the outcome or ultimate resolution of these matters.MTBE LitigationIn December 2017, the state of Maryland filed suit in Baltimore City Circuit Court against Duke Energy Merchants and other defendants alleging contamination of state waters by MTBE leaking from gasoline storage tanks and is seeking an unspecified amount of monetary damages. MTBE is a gasoline additive intended to increase the oxygen levels in gasoline and make it burn cleaner. The case was removed from Baltimore City Circuit Court to federal District Court. Initial motions to dismiss filed by the defendants were denied by the court in September 2019, and the matter is now in discovery. In December 2020, the plaintiff and defendants selected 50 focus sites, none of which have any ties to Duke Energy Merchants. Discovery will be specific to those sites. Duke Energy Merchants has reached an agreement in principle with the state of Maryland to resolve the litigation. The settlement agreement is being finalized and the amount is not material. The Town of Carrboro LitigationOn December 4, 2024, the town of Carrboro, North Carolina, filed a lawsuit against Duke Energy in the North Carolina Superior Court, Orange County, alleging that Duke Energy and its predecessor companies knew since the late 1960s that fossil fuel emissions could cause global climate changes and engaged in a campaign to conceal the dangers of fossil fuel emissions from the public, regulators, legislators, and others, resulting in a delayed transition away from fossil fuel emissions and worsening climate change. The lawsuit also alleges that Duke Energy misled the public regarding Duke Energy’s support for, and actions toward, transitioning its fossil fuel portfolio to renewable energy. The damages alleged range from road and stormwater system impacts to increased electricity costs and recurring invasions and interferences from extreme weather events. The lawsuit asserts state law claims for public nuisance, private nuisance, trespass, negligence, and gross negligence, and is seeking an unspecified amount of monetary damages. The case has been transferred to the North Carolina Business Court. Duke Energy filed a motion to dismiss the litigation based on lack of subject matter jurisdiction on March 17, 2025, and filed a motion to dismiss based on failure to state a claim on which relief can be granted on May 9, 2025. Oral argument regarding Duke Energy's motions to dismiss was held on September 25, 2025. As requested by the court, supplemental briefing addressing various aspects of causation, including traceability and proximate cause, was filed on October 25, 2025.

, including regulatory and environmental matters, see Note 4, "Regulatory Matters," and Note 5, "Commitments and Contingencies," to the Condensed Consolidated Financial Statements. For additional information, see Item 3, "Legal Proceedings," in Duke Energy's Annual Report on Form 10-K for the year ended December 31, 2024.The Town of Carrboro LitigationOn December 4, 2024, the town of Carrboro, North Carolina, filed a lawsuit against Duke Energy in the North Carolina Superior Court, Orange County, alleging that Duke Energy and its predecessor companies knew since the late 1960s that fossil-fuel emissions could cause global climate changes and engaged in a campaign to conceal the dangers of fossil fuel emissions from the public, regulators, legislators, and others, resulting in a delayed transition away from fossil fuel emissions and worsening climate change. The lawsuit also alleges that Duke Energy misled the public regarding Duke Energy’s support for, and actions toward, transitioning its fossil fuel portfolio to renewable energy. The damages alleged range from road and stormwater-system impacts to increased electricity costs and recurring invasions and interferences from extreme weather events. The lawsuit asserts state law claims for public nuisance, private nuisance, trespass, negligence, and gross negligence, and is seeking an unspecified amount of monetary damages. The case has been transferred to the North Carolina Business Court. On March 17, 2025, Duke Energy filed a motion to dismiss the litigation based on lack of subject matter jurisdiction. In addition, Duke Energy's motion to dismiss based on failure to state a claim on which relief can be granted is due by May 9, 2025. Duke Energy cannot predict the outcome of this matter.

Hamlin v. Duke Energy Ohio, Inc. — Case No. 1:26-ap-01010 (ohsb, filed 2026-02-24). Source: CourtListener public docket index. Match confidence: medium. Materiality and substance have not been confirmed against SEC disclosures.

McCrae v. Duke Energy Carolinas LLC — Case No. 4:25-cv-13115 (scd, filed 2025-10-24). Source: CourtListener public docket index. Match confidence: medium. Materiality and substance have not been confirmed against SEC disclosures.

Rappe v. Duke Energy Carolinas, LLC — Case No. 3:25-cv-00735 (ncwd, filed 2025-09-24). Source: CourtListener public docket index. Match confidence: medium. Materiality and substance have not been confirmed against SEC disclosures.

Duke Energy Carolinas, LLC v. DeLorenzo — Case No. 5:25-cv-00146 (ncwd, filed 2025-09-12). Source: CourtListener public docket index. Match confidence: medium. Materiality and substance have not been confirmed against SEC disclosures.

Carr v. Duke Energy Carolinas LLC — Case No. 6:25-cv-07371 (scd, filed 2025-07-15). Source: CourtListener public docket index. Match confidence: medium. Materiality and substance have not been confirmed against SEC disclosures.

Gipson v. Duke Energy Corporation — Case No. 3:24-cv-01120 (ncwd, filed 2024-12-23). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Davidson v. Duke Energy Corporation — Case No. 3:24-cv-01113 (ncwd, filed 2024-12-20). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Cintron v. Duke Energy Carolinas, LLC — Case No. 3:24-cv-01080 (ncwd, filed 2024-12-16). Source: CourtListener public docket index. Match confidence: medium. Materiality and substance have not been confirmed against SEC disclosures.

McCord v. Duke Energy Corporation — Case No. 3:24-cv-01084 (ncwd, filed 2024-12-16). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Khan v. Duke Energy Corporation — Case No. 3:24-cv-01083 (ncwd, filed 2024-12-16). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Keiser v. Duke Energy Corporation — Case No. 3:24-cv-01081 (ncwd, filed 2024-12-16). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

LIGON v. DUKE ENERGY INDIANA, LLC — Case No. 3:24-cv-00088 (insd, filed 2024-05-22). Source: CourtListener public docket index. Match confidence: medium. Materiality and substance have not been confirmed against SEC disclosures.

Kimner v. Duke Energy Corporation — Case No. 3:24-cv-00411 (ncwd, filed 2024-04-23). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Jones v. Duke Energy Corporation — Case No. 3:24-cv-01281 (scd, filed 2024-03-15). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Stone v. Duke Energy Corp — Case No. 3:04-cv-00277 (ncwd, filed 2004-06-07). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Gibaut v. Duke Energy Corp — Case No. 4:03-cv-02514 (txsd, filed 2003-07-10). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Martinez v. Duke Energy Corp — Case No. 6:03-cv-00049 (scd, filed 2003-01-06). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

United States v. DUKE ENERGY CORP. — Case No. 1:02-mc-00480 (dcd, filed 2002-11-27). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Finkel v. Duke Energy Corp. — Case No. 1:02-cv-05770 (nysd, filed 2002-07-23). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Kinser v. Duke Energy Corp. — Case No. 1:02-cv-05711 (nysd, filed 2002-07-22). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Honig v. Duke Energy Corp. — Case No. 1:02-cv-05529 (nysd, filed 2002-07-17). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Willet v. Duke Energy Corp. — Case No. 1:02-cv-05197 (nysd, filed 2002-07-09). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Kushneer v. Duke Energy Corp. — Case No. 1:02-cv-05055 (nysd, filed 2002-06-28). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Owens v. Duke Energy, Corp. — Case No. 1:02-cv-04949 (nysd, filed 2002-06-26). Source: CourtListener public docket index. Match confidence: medium. Materiality and substance have not been confirmed against SEC disclosures.

Elstein v. Duke Energy Corp. — Case No. 1:02-cv-04916 (nysd, filed 2002-06-25). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Boushey v. Duke Energy Corp. — Case No. 1:02-cv-04693 (nysd, filed 2002-06-18). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Goldstein v. Duke Energy Corp. — Case No. 1:02-cv-04514 (nysd, filed 2002-06-14). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Wickerware, Inc. v. Duke Energy Corp. — Case No. 1:02-cv-04084 (nysd, filed 2002-05-29). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

In Re: Duke Energy Corp. v. Duke Energy Corp. — Case No. 1:02-cv-03960 (nysd, filed 2002-05-23). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Stewart v. Duke Energy Corp — Case No. 3:01-cv-00427 (ncwd, filed 2001-07-20). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Grant v. Duke Energy Corp — Case No. 3:01-cv-00428 (ncwd, filed 2001-07-20). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Keziah v. Duke Energy Corp — Case No. 3:01-cv-00426 (ncwd, filed 2001-07-20). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.

Hamilton v. Duke Energy Corp — Case No. 1:00-cv-01642 (cod, filed 2000-08-17). Source: CourtListener public docket index. Match confidence: high. Materiality and substance have not been confirmed against SEC disclosures.