That means residential customers will pay $11 more per month, according to Duke Energy. Rates for industrial customers would increase 15 percent and rates for other customers would increase by nearly 10 percent.
Duke Energy says the increase would generate nearly $500 million for the company.
Charlotte-based Duke Energy Corp. adjusts its fuel costs for customers annually, but the last general rate increase in North Carolina was 1991.
Even with the requested increase, Duke Energy said rates in the Carolinas will remain well below national averages.