The field test is included in the EU project ZeEUS (Zero Emission Urban Bus System) which is primarily aimed at testing and assessing how electrically-powered bus traffic in urban areas can help reduce air pollution, climate impact and noise levels.
Eight plug-in hybrid buses will run in the scheduled bus services in central Stockholm for the duration of the project.
In partnership with Volvo Buses and SL (AB Storstockholms Lokaltrafik [Greater Stockholm public transport]), Vattenfall is behind the project and in charge of installing charging stations at the terminuses.
"Vattenfall will actively contribute to future solutions for the transport sector and our natural role is to supply electricity and offer charging services as is the case here. Through this demonstration, we hope to display the positive sides of electrification as a source of efficient energy and create a better environment," says Torbjörn Wahlborg, Head of Vattenfall Nordic.
The buses are fitted with an electric motor and a battery pack that is quickly charged at the terminuses. It takes about 6 minutes to charge. Fully-charged batteries enable the buses to travel quietly and entirely without fumes using electricity for seven of the route's eight kilometres.
Compared to conventional diesel-driven buses, the plug-in hybrids have 75 per cent lower fuel consumption and consequently a similarly large reduction in carbon dioxide emissions.
The climate impact is further reduced as the buses run on bio-diesel. With the electricity consumption included the total energy savings are around 60 per cent.
Facts about the field test in Stockholm.
The buses will run on SL's route 73 between Ropsten and Tomteboda/Karolinska.
The main players and participants in the project are: Vattenfall, SL, Volvo Buses and Viktoria Swedish ICT. Siemens and Keolis are partners. The project is partly financed by the EU.
Facts about ZeEUS
The ZeEUS project is coordinated by the international organisation for public transport, UITP. More than 40 companies and organisations participate in ZeEUS.
In addition to Stockholm, Glasgow, London, Münster, Bonn, Plzen, Barcelona and Cagliari are also participating in the project.
Read more about ZeEUS