The Solar for Schools CBS or local community Energy group issues bonds or redeemable shares with a target interest of 4-5%. The collected funds are used to pay for the development, installation and equipment for each system. The electricity from the solar panels is sold to the school, with any spare electricity sold to the grid. The income from sale of electricity is used to pay interest, maintenance and gradually repay investors. In some cases as with the Solar for Schools CBS the solar panels will be re-financed with a bank such as Triodos after 5 years, at which point investors are re-paid completely.