noun
electricity consumption; electric mileage
Primarily used for electric vehicles, analogous to fuel efficiency for gasoline cars. Can refer to both the amount of electricity consumed and the distance traveled per unit of electricity.
このEVの電費は1キロワット時あたり6キロメートルです。
This EV's electric mileage is 6 kilometers per kilowatt-hour.
冬は暖房で電費が悪化する。
In winter, electricity consumption worsens due to heating.