The kilowatt-hour (kWh) is a unit for measuring electrical energy consumed or produced over a period.
It corresponds to the amount of energy used when a device with a power of one kilowatt operates for one hour. In electric mobility, kWh is used to measure battery capacity: a higher capacity means a vehicle can travel more kilometers before needing a recharge. For instance, a heavy-duty vehicle consuming 1.2 kWh/km could travel approximately 500 km with a 600 kWh battery. The kWh is also the unit used for billing the electricity consumed during a charging session.
Note: kWh measures a quantity of energy, while kW expresses instantaneous power.