Green certificate

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What Wikipedia says

A green certificate are a tradable commodity proving that certain electricity is generated using renewable energy sources. Typically one certificate represents the generation of one Megawatthour of electricity. What is defined as "renewable" varies from certificate trading scheme to trading scheme.

Excerpt from the Wikipedia article “Green certificate”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dirk Goldhahn, CC BY-SA 2.5, via Wikimedia Commons.