Falling fuel prices result in lower customer rates Bill for typical residential customer will be 23% below national average CHARLOTTE, N.C., Aug. 28, 2024 /PRNewswire/ -- Duke Energy Carolinas customers in North Carolina will see their electric rates fall starting Jan. 1 as part of an annual adjustment for the cost of fuel used to generate electricity at its power plants. A typical residential customer in North Carolina using 1,000 kilowatt-hours (kWh) per month will see an overall decrease of $5.17, or abo ...