Volvo's electric hybrids and ABB's fast-charging systems are based on a common interface known as OppCharge, which enables the charging stations to also be used by electrified buses from other vehicle manufacturers. OppCharge is now being implemented as a common interface in more than 12 countries.
The Volvo 7900 electric hybrid bus operates quietly and exhaust emission-free on electricity for about 70 per cent of its route. Battery recharging takes three to four minutes via OppCharge opportunity charging, which uses a specialist overhead mast connected to the bus via a pantograph.