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-.