Recent investments have strengthened the grid and reduced outages for customers The electric utility serves nearly 680,000 customers in the Upstate region and along the I-77 corridor south of CharlotteGREENVILLE, S.C., July 1, 2025 /PRNewswire/ -- Duke Energy Carolinas today asked South Carolina regulators to perform a public review of the company's current rates. The company last requested a review of base rates for customers in early 2024. Since then, the company has made investments in the things our ne ...