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San Francisco International Airport (SFO) announced the deployment of six all-electric, zero-emission buses and related electric vehicle charging infrastructure as part of the airport’s Strategic Plan Goal to achieve carbon neutrality by 2021.

The six new Proterra Catalyst E2 battery-electric buses will replace the remaining diesel buses in the fleet to run all regular daily routes. The 40-foot buses feature 27 seats with luggage racks and since all-electric buses have no combustion engine, passengers will experience a quieter, smoother ride.

“The addition of these all-electric buses to our fleet moves us closer toward a more sustainable world-class airport and helps us reach our aggressive zero-emissions goals,” said SFO Director Ivar Satero. “Deploying these all-electric buses can help us significantly reduce costs and emissions, while simultaneously improving the passenger experience. My thanks go out to the entire team who made this milestone possible.”

The all-electric buses significantly reduce operating costs with its batteries equipped to last the entire daily route on a single charge and require no liquid fuel. Lower fuel prices and reduced vehicle maintenance costs will result in an estimated savings for SFO of about $4.5 million during the 12-year lifespan of these new Proterra buses.