Under the Renewable Energy Act, which has been imitated around the world, any renewable power investor — be it a household installing a solar array on the roof, a cooperative erecting a windmill, a farmer running a biogas
installation, or an institutional investor operating an offshore wind park — could sell their green electricity at a guaranteed price above wholesale market price, fixed in advance for 20 years (for
more details,
see the factsheet Defining features of the Renewable Energy Act (EEG)-RRB-.