GREENVILLE, South Carolina, May 3 -- Duke Energy issued the following news release: Duke Energy Progress is seeking to reduce customer bills to account for the cost of fuel used to generate electricity for South Carolina homes and businesses. If approved by the Public Service Commission of South Carolina (PSCSC), the average monthly residential bill would decrease by 4.1% beginning Aug. 1. The total monthly impact of these rate changes for a residential customer using 1,000 kilowatt-hours (kWh  more