During the day, your solar panels often produce more energy than your home uses. This surplus flows into FPL’s grid.
At the end of each calendar year, if you still have unused credits, FPL "buys them back" in cash. However, this is paid at the avoided cost rate (the wholesale price FPL would have paid to buy fuel for their own plants), which is significantly lower than the retail rate you pay for power. Key Requirements for FPL Solar Customers fpl solar buy back
It is important to distinguish between and cash payments : During the day, your solar panels often produce