Clean Assist uses Renewable Energy Certificates (REC), verifying the energy you use is from a renewable resource with no emissions. By enrolling your Toyota, you help contribute to the renewable energy market and a cleaner Earth!"
Toyota purchases the equivalent RECs to match the amount of energy charged, then retires these RECs with the REC certification agency to account that this amount of renewable electricity has been consumed by a Toyota customer’s EV that charged using Clean Assist. 
Additionally, Toyota provides this data—the amount of renewable electricity used—to the California Air Resources Board (CARB), which results in Low Carbon Fuel Standard (LCFS) credits that can be sold. The proceeds from this are then reinvested in promoting electric vehicles through marketing, education, charging and more.