If the request is approved as filed, the monthly bill of a residential customer would drop ten cents to $106.92 for 1,000kWh of electricity, beginning January 2012.
According to the company, commercial customers would remain flat and industrial customers would see a slight decrease.
Tampa estimates that by the end of 2011 it will spend $47m less on fuel than originally projected because of lower projected fuel costs.
The decrease in the fuel portion of the bill is based on lower costs for natural gas and purchased power during the first six months of 2011, projections for the remainder of this year and expected fuel prices in 2012, the company said.