Solar für Kinder Betriebs GmbH & Co. KG accepts loans with an interest rate of 4-5%, with a term of 5 years. The collected funds are used to pay for the planning, installation and material of a solar system. The electricity generated by the solar modules is sold to the school / institution. The excess electricity is fed into the grid regulated by law and remunerated. The amount of money raised by selling the surplus electricity is used to pay interest and maintenance and to gradually repay the loans. In some cases, such as funding from the Solar für Kinder Betriebs GmbH & Co. KG, the solar modules are refinanced by an environmental bank after 5 years. At this time, the lenders will be fully refundable including interest.