# Upload energy data

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You can only upload energy data after your project has been approved by your registry
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RECs are issued against energy produced by a renewable source. To transform renewable energy into RECs, users upload their *energy data* to Fuel Switch. 

We refer to *energy data* when describing the readings (kWh and timestamp) captured by meters of renewable energy sources (aka. renewable energy projects). Energy data is always associated to a single, specific meter of a renewable project.