I live in FL and have Duke Energy. I rarely see a bill higher than $80.00. Good luck because I’ve used TECO in the past and they are crazy to deal with.
We have duke also and our bill runs about 122 last month. It gets up there in august. We got a new roof and AC and it dropped it 20 bucks a month. A few years back we got electric bill of 300 bucks. We called and complained and got the bs run around. We weren’t the only ones that received a whopper of a bill. Next month it’s back to normal. We just paid it and moved on. If you don’t they cut off your juice. Lol.
Summers, before we moved, had a Florida horse farm, (lots of well use), air conditioning house, everything , electric utilities were never more than 250$, Clay Electric.
Sounds like someone is running a service cord from the back of your house.