BAE Systems collaborated with San Francisco to geofence areas throughout the city where transit buses will operate solely on battery electric power.

BAE Systems announced its selection by the San Francisco Municipal Transportation Agency (SFMTA) to supply electric power and propulsion systems for its transit buses. The Series-ER (Electric Range) system will operate on 68 transit buses and create designated zones throughout San Francisco that are free of emissions. The Series-ER system targets these hot spots to reduce emissions and improve air quality in the areas where people live, work, and visit.

The system opens a new door for San Francisco to get to zero emissions by 2035, as each bus will now be able to drive on clean electric power through each of the areas – known as "green zones." Buses can now switch to battery power from a combustion engine, temporarily eliminating diesel emissions when they cross the threshold of a green zone. The technology allows the city to convert the fleet into part-time electric buses as an intermediate step to full electrification.

"This technology helps San Francisco get one step closer to full zero emissions operations, improving the health of the city's environment and its residents," said Steve Trichka, vice president and general manager of BAE Systems' Power and Propulsion Solutions business. "With Series-ER, buses are programed using global positioning software to turn off the bus engine once it enters the green zone and operate solely on electric battery energy."

BAE Systems is helping cities around the world get to zero emissions with electric power and propulsion systems for transit buses. But the path to zero for each city is unique, so the company is getting creative. For cities like San Francisco, that means using BAE Systems technology to create green zones.

The green zones — nine in total — are located in population-dense neighborhoods most affected by air pollution. Each of the zones have a large presence of traffic that is contributing to a high rate of air pollution.

While green zones are picking up speed in San Francisco, the city is not alone. Boston, Louisville, Montreal, Nashville, and Seattle are using Series-ER technology to cut down emissions. Series-ER has also made the trip overseas to the United Kingdom, where it is powering new double deck buses in Brighton.

The Series-ER system is part of the company's 20-plus years of experience developing and integrating electric propulsion and accessory systems for transit buses. It builds on that core technology by increasing the amount of on board battery energy storage to provide zero emission travel without the need to stop the bus to recharge. This not only extends electric travel time and distance, but eliminates the need to add large and costly charging stations.

Nicole Gable
Nicole Gable
Media Relations
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