They are currently all grid-powered, but the long-term plan is to install solar canopies at all locations (provided by Elon's other company, SolarCity) to offse

They are currently all grid-powered, but the long-term plan is to install solar canopies at all locations (provided by Elon's other company, SolarCity) to offset the power usage. They even plan on making it a profit center for the business eventually.