The extra solar energy is fed back into the grid through your production meter to the nearest loads(your neighbor’s houses through their utility meters) and you pay a net usage fee each month. So for example, if you used 1000 kwh and produced 1000 kwh your net energy usage would be $0. We Energies and other utilities have service fees each month regardless of what kind of billing you have, so you would only offset those fixed service costs by producing more than you use. Most utilities credit you about 1/3rd of what you produce over and above your net usage. We Energies is $0.04642/kwh So if you used 1000 kwh but produced 1250 kwh, you would get a credit that month for $11.605. Because of this, we suggest that you size your system for your usage or slightly higher as the panels do slightly degrade in production over 30-40+ years. If you produced 750 kwh and used 1000 kwh in a month, your energy charge would be $42.885 (250 x $0.17154). Once your credit with We Energies gets over $100, you receive a check from them, otherwise any amount less than that is applied to your account balance the following month.