DUKE ENERGY FLORIDA, LLC

Information regarding the NTE Carolinas II, LLC Litigation matter included in Part I, Item 1, Note 5, "Commitments and Contingencies," of the Condensed Consolidated Financial Statements is incorporated herein by reference.

For open litigation, unless otherwise noted, Duke Energy cannot predict the outcome or ultimate resolution of these matters.

MTBE Litigation

In December 2017, the State of Maryland (the State) 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. The State seeks an unspecified amount of monetary damages. MTBE is a gasoline additive intended to increase the oxygen content in gasoline and promote cleaner combustion. The case was removed from Baltimore City Circuit Court to federal district court. In December 2020, the State and the defendants selected 50 focus sites, none of which have any ties to Duke Energy Merchants. In November 2025, Duke Energy Merchants entered into a settlement agreement with the State that provided for the payment of an immaterial amount to settle the claims against Duke Energy Merchants. Certain non-settling defendants opposed the settlement, and the court subsequently withdrew its prior dismissal orders. Following a hearing and competing proposed orders, the court referred the matter to a magistrate judge for mediation, which occurred on July 29, 2026. Mediation was not successful and the language for the dismissal order is back before the federal district court for resolution.

Clermont County Litigation

On September 24, 2026, the Clermont County Board of Commissioners filed a lawsuit against Duke Energy Beckjord, LLC, Duke Energy Ohio, and several current and former owners of the former W.C. Beckjord Station property in the United States District Court for the Southern District of Ohio. The lawsuit asserts claims under the federal Resource Conservation and Recovery Act and the 2015 CCR Rule, as amended, alleging that historical coal combustion residual disposal units at the site contributed to groundwater contamination and present a risk to human health or the environment. The lawsuit seeks injunctive relief, civil penalties, corrective action and remediation-related relief, recovery of certain costs and other relief. The complaint does not specify the amount of monetary relief sought.

Other Proceedings

In addition, the Duke Energy Registrants are, from time to time, parties to various lawsuits and regulatory proceedings in the ordinary course of their business. For information regarding 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, 2025.