Net Metering is effectively a banking system for electricity. During the day, your solar panels will likely produce more energy than your home needs. This excess energy is sent to the EAC grid, and your meter "spins backward" (or digitally records the export).
At night or on cloudy days when you need to pull electricity from the grid, you use up these "banked" credits. At the end of the billing period (usually every two months), the EAC calculates the difference. If you produced as much as you consumed, you only pay the fixed grid usage fees. If you have leftover credits, they typically roll over to the next bill, up until the final settlement at the end of the financial year.