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Green certificates
Tradable certificates issued for renewable energy. See Renewable energy. Also known as Renewable Energy Certificates (RECs) in the USA, are a tradable commodity proving that certain electricity is generated using renewable energy sources. Typically one certificate represents generation of 1 Megawatthour of electricity. What is defined as "renewable" varies from certificate trading scheme to trading scheme. Usually, at least the following sources are considered as renewable:
Wind (often further divided into onshore and offshore)
Solar (often further divided into photovoltaic and thermal)
Wave (often further divided into onshore and offshore) and tidal (often further divided into onshore and offshore)
Geothermal
Hydro (often further divided into small - microhydro - and large)
Biomass (mainly biofuels, often further divided by actual fuel used).
Green certificates represent the environmental value of renewable energy generated. The certificates can be traded separately from the energy produced. Several countries use green certificates as a mean to make the support of green electricity generation closer to a market economy instead of more bureaucratic investment support and feed-in tariffs. Such national trading schemes are in use in e.g. Poland, Sweden, the UK, Italy, Belgium (Wallonia and Flanders), and some US states.
In contrast to CO2e-Reduction certificates, e.g. AAU's or CER's under the UNFCC, which can be exchanged worldwide, Green Certificates cannot be exchanged/traded between e.g. Belgium and Italy, let alone the USA and the EU member States.
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