As you can tell by doing a quick calculation, interest rate payments to the crowd-investors would amount to more than 36.000 EUR in total. Also, according to further project information, energy cost savings from the concerned 800 families would only be paid to the project during the first 4 years; afterwards, the Kenian families can benefit from their cost savings for their own household budget. Thus, if the estimated annual savings of 80.000 EUR were fully realized, this would generate 320.000 EUR for the project's budget after 4 years. After paying back, as mentioned above, the invested sum of 237.800 EUR plus interest rates of more than 36.000 EUR, this leaves only about 45.000 EUR to cover other expenses. Indeed, apart from administrative costs, these other expenses arise from the fixed costs (per kW and per installation) for the installation of 800 "Solar Home Systems" (45.000 EUR divided by 800 homes equals about 56 EUR per home; without applying any actualization rate on those expenses, for simplification).