Every megawatt-hour (MWh) of electricity has energy attributes. Consider these as the factual descriptors tied to a specific 1 megawatt-hour (MWh), and include generation technology, plant location, support status, facility start date, and the production period of the generation. The desirability of energy with renewable generation technology attributes is the easiest to understand, but all attributes serve a purpose, usually relating to supporting the credibility of a renewable claim.

Energy Attribute Certificate (EACs) act as the formal instrument recording those attributes per 1MWh.