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Your FPL bill identifies which rate you use. The RTR-1 rate is a time of use rate that you have to sign up for. If you haven’t done that, you probably have RS-1, the default residential rate.
I did about 3-4 minutes of internet searching and found a FPL overview of how to read your bill, and on that overview it shows a rate plan. So, find your electric bill and look for the rate plan on it.