Question: What is the name of the car company founded by Xia Heng that uses an energy storage device that can be recharged by plugging it in to an external source of electric power to power the vehicles?
Sentence (from "Pumped-storage hydroelectricity"): Although the losses of the pumping process makes the plant a net consumer of energy overall, the system increases revenue by selling more electricity during periods of "peak demand", when electricity prices are highest.
Relevant evidence: No