Grid Tied Net Metered systems involve connecting your system to the power grid but you use the power, and it offsets your electric bill. If you don’t produce as much electricity as you use then the grid just supplies the difference and you get billed for that difference, if you produce more than you use, the excess just goes to the grid. Whether you get paid for that difference that you supply to the grid depends on the net metering rules in your jurisdiction. You may not get paid for that difference, but you may be able to carry forward that excess of electricity you produced over what you used for a period of time so that you can use it or “draw down” on it in periods of time when you are producing less electricity than you are using. For instance in Ontario currently, you don’t get paid for excess electricity that goes to the grid in a net metering arrangement, however you can carry forward the excess electricity generated for up to one year, after that it expires.