Appalachian PowerROANOKE, Va. (AP) _ Residential customers of Appalachian Power in Virginia are seeing their monthly bills decrease by about 4 percent this month. The utility says the lower bills are the result of the reduction or expiration of three rate adjustment clauses. For Virginia customers, that means a monthly bill of $114.92 for 1,000 kilowatt hours of electricity a month. That’s down from $119. Rate adjustments are separate from the base rate, which accounts for about 60 percent of a customer’s bill.