In a grid-tied solar electric system, electricity can flow through your meter in either direction, depending on the amount of electricity your system is producing and how much electricity you are using. When your system is producing more electricity than needed, the surplus goes back into the grid, providing you credit. At other times, you draw power from the utility grid, in which case you are “buying” electricity. Net metering keeps track of the difference between the electricity produced by your system and the grid-supplied electricity you use. You still have access to all the power you need.