Volvo 7700 Hybrid bus, available from 2009, is a modern, two-axle city bus with hybrid power - giving you fuel savings of up to 30 percent!
The bus is a parallel hybrid featuring diesel and electric power that can operate independently of the other. The electric motor is used to start and accelerate the bus up to about 20 km/h, enabling considerable fuel savings. At higher speeds, the diesel engine takes over, while also recharging the batteries. The electric motor serves both as a motor and a generator. When the brakes are applied, the retardation energy is transmitted to charge the batteries.