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Green certificates

A Green Certificate, also known as Renewable Energy Certificates (RECs) in the USA, are a tradable commodity proving that certain electricity is generated using renewable energy sources. The GC support scheme is based on the legislation which requires producers and importers of non-renewable electricity to inject a minimum quota of renewable electricity into the power system every year. GCs represent proof of compliance with the renewable quota obligation: each GC is conventionally worth 1 MWh of renewable electricity. Green certificates represent therefore the environmental value of renewable energy generated.