Best answer by Tim_Boost
Any energy you use will first draw on the energy being produced by your solar panels. If there's not enough energy being produced, you'll draw from the grid. Likewise if you're producing more then you need, you will export that energy to the grid.
A generation meter will measure how much you produce. The only difference a smart meter has is that it's able to measure exactly how much you export to the grid. So you get paid accurately by your Feed in Tariff (FIT) provider.