The Massachusetts Bay Transportation Authority (MBTA) has ordered 194 electric-hybrid buses from BAE Systems.
The buses will operate on BAE’s Series-ER extended range propulsion system. The electric motor system has a higher capacity battery that helps reduce noise pollution and emissions.
The battery is recharged through two methods: regenerative energy produced when the bus slows to a stop and an onboard generator using a downsized internal combustion engine.
Buses can operate for part of the day with the engine off. This saves transit agencies maintenance while reducing idling.
“Our new technology provides Massachusetts with an innovative and practical electric-hybrid solution,” Steve Trichka, vice president and general manager of the Power and Propulsion Solutions business at BAE Systems, said. “This system provides clean electric operation that can be rapidly scaled now to help Massachusetts reap the benefits seen in thousands of buses worldwide.”
Traditional buses operate on diesel fuel. The Series-ER globally reduces carbon dioxide emissions by 250,000 tons and saves more than 22 million gallons of diesel, according to BAE.
Boston’s buses will drive through the city’s tunnels.
Other U.S. cities are using the Series-ER system. Nashville uses the system to power buses in the downtown tourist area and near hospitals and schools.