Koon did not expect the number to go up significantly but he said the total number of those without power could fluctuate in the next few days.
Debby has drenched the state with heavy rains and flooded neighborhoods. It also has been blamed for spawning tornadoes that has killed at least one person.
The storm closed the sole bridge to St. George Island, a popular vacation island in Florida. Power was already out on the island and Franklin County authorities said it could be days before it is restored.
Florida Power & Light (FPL) says customers on the West Coast who experienced a power outage as a result of Tropical Storm Debby should have power restored between midnight and 4 a.m. Tuesday. Due to the slow movement of Tropical Storm Debby, FPL expects continued outages to their service territory over the next three to four days.