DUKE ENERGY PROGRESS, LLC.

Item 8.01. Other Events. As previously disclosed, on August 14, 2025, Duke Energy Carolinas, LLC (“Duke Energy Carolinas”) and Duke Energy Progress, LLC (“Duke Energy Progress,” and together with Duke Energy Carolinas, the “Companies”) filed a joint application with the North Carolina Utilities Commission (“NCUC”) and the Public Service Commission of South Carolina (“PSCSC”) for approval to combine utilities, by which Duke Energy Progress will merge into Duke Energy Carolinas, resulting in a single electric utility serving the Companies’ North Carolina and South Carolina service territories. Duke Energy Corporation, together with the Companies, also filed an application with the Federal Energy Regulatory Commission (the “FERC”) on the same day. In connection with the utility combination (the “Combination”), and immediately prior thereto, Duke Energy Corporation expects to contribute its 100% equity interest in Duke Energy Carolinas to Progress Energy, Inc. (“Progress Energy”). The targeted effective date of the Combination is January 1, 2027. On January 30, 2026, the FERC issued an order authorizing the Combination as consistent with the public interest. Additionally, the NCUC and the PSCSC issued orders approving the Combination on May 1, 2026, and June 3, 2026, respectively. The effectuation of the Combination remains subject to approval by the boards of directors of both Companies and the board of directors of Progress Energy, to the entry by the Companies, Progress Energy and Duke Energy Corporation into a definitive agreement governing the Combination and to the satisfaction of other conditions. Duke Energy Progress is filing this Current Report on Form 8-K solely to provide certain information relating to the proposed Combination. Additionally, Duke Energy Progress is providing certain supplemental risk factors related to the proposed Combination, which are filed as Exhibit 99.4 and incorporated herein by reference. Duke Energy Progress is filing herewith (i) the audited consolidated financial statements of Duke Energy Carolinas as of December 31, 2025 and 2024 and for the years ended December 31, 2025, 2024 and 2023, which are filed as Exhibit 99.1 and incorporated by reference herein, and (ii) the unaudited condensed consolidated interim financial statements of Duke Energy Carolinas as of June 30, 2026 and December 31, 2025, and for the six months ended June 30, 2026 and 2025, which are filed as Exhibit 99.2 and incorporated by reference herein. These financial statements have been prepared by Duke Energy Carolinas in accordance with the rules and regulations of the Securities and Exchange Commission and U.S. generally accepted accounting principles.