Hourly Clean-Energy Matching: Do Green Certificates Cover Every Hour?

Renewable-energy certificates (Guarantees of Origin in the EU, I-REC internationally) let a buyer claim "100% renewable electricity" by matching their annual consumption against a renewable plant's annual generation — regardless of what hour either happened. This simulator builds a real 24-hour grid: an adjustable solar and wind fleet generates power against a two-peak household demand curve, and you can toggle between the loose annual accounting that certificates actually use and the strict 24/7 hourly matching standard now being adopted by major energy buyers. Watch how a grid that looks 100% certified-green on paper can still be visibly running on fossil backup power for hours at a time.