Harvesting solar energy on your own roof: the founders of Solaga believe that in the future photovoltaics will no longer be needed for this. The start-up wants to build a system with which everyone can generate biogas themselves. A green carpet of algae is to produce the environment-friendly energy. The motto is: solar methane rather than solar power. The advantage: the gas that is generated can be stored for a longer time in tanks without any problems. And home owners no longer have to buy expensive batteries or fuel cells, which are needed to generate electricity via photovoltaics. A new path to an independent energy supply.