With MECO's "Net Metering" (NEM) program, the solar pv system sends all excess energy back to the grid, after powering the loads. You receive full credit for the energy you send back to the grid at a 1:1 ratio. This credit rate is NOT subject to change. Any excess kwh credits are banked on a yearly basis. Excess credits are rolled over to the next month, until your "anniversary date". Your anniversary date can be changed to any month you wish, but only one time. After the anniversary date, any credits are lost and the process restarts. This program is currently closed, but all current NEM agreements are grandfathered. However, it's not too late to get solar. MECO's Customer Self Supply program is still open. If you sell your home, the new owners can inherit your NEM agreement from MECO. This gives your home a MUCH higher resale value than a comparable home.