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King County Metro Transit to purchase 120 battery-electric buses by 2020, 73 from Proterra

King County, Washington, Executive Dow Constantine announced that King County Metro Transit will acquire 120 battery-electric buses by 2020. As part of this commitment, Metro will purchase up to 73 battery buses from Burlingame, Calif.-based Proterra. The first 20 are scheduled to go into service this year and 2019. Metro serves Seattle and the rest of King County.

Eight of the buses are slated to go into service this year; 12 more in 2019. Up to eight of the new 40-foot battery buses will likely operate on Metro Routes 226 and 241 in Bellevue. As part of a pilot project last year, Metro began running three all-electric buses on these routes, which serve some of the county’s densest job centers, including the Microsoft campus and downtown Bellevue.

The 40-foot Catalyst buses have a range capacity spanning from 62-350 miles per charge (nominal range), with a quick charging time of just 10 minutes. Maintenance costs of all-electric buses are expected to decline versus hybrid-diesels, primarily because they have fewer moving parts.

The 73 battery-electric buses from Proterra will cost up to $55 million, starting with 20 buses totaling $15.12 million. Charging stations to support the initial orders of those buses will range from $5.5 million to $6.6 million.

Federal funding often helps pay for Metro’s new bus purchases. Last year, King County Metro received a $3.3-million grant from the Federal Transit Administration’s Low-or No-Emission Vehicle Deployment Program to help fund some new battery buses and charging stations for three buses that are in operations on the eastside of King County.

Metro will also acquire up to nine long-range electric buses from different manufacturers to test the battery technology with a range of about 140 miles. With this approximately $7-million acquisition, Metro is challenging the industry to produce buses that can travel farther. Metro also is calling on the industry to develop 60-foot long buses, better able to replace the articulated buses that make up 55 percent of its fleet.

Each battery bus reduces tailpipe greenhouse gas emissions by an estimated 65 tons each year, the equivalent of 21 cars off the road. The new buses run cleaner, quieter, and reduce dependence on fossil fuels. Cutting diesel emissions also means better air quality, benefiting people with asthma and other health issues.

Metro is a leader in clean technology. It was the first transit agency to adopt diesel-electric hybrids, and it currently operates more than 170 electric trolley buses. By committing to replacing its current fleet with clean vehicles, Metro is influencing the development and expansion of the all-electric bus market.

Transportation is the region’s largest source of greenhouse gas emissions, emitting nearly half of all greenhouse gas emissions. The County’s Strategic Climate Action Plan calls for both increased transit service and a cleaner fleet to reduce greenhouse gas emissions. The new battery bus technology will reduce Metro’s fuel use as it provides more service to customers.

To better serve our customers, we want battery buses that travel longer distances and can carry more people. We’re committed to expanding our battery bus fleet, and need the industry to accelerate development of standardized battery bus charging systems so they can work flexibly for any bus route, and also build more 60-foot-long articulated buses—which serve as the transit workhorses in King County.

—Rob Gannon, Metro Transit General Manager

In conjunction with this battery bus order, Metro is conducting a comprehensive analysis of the best approach for achieving a zero-emissions fleet. A Battery Bus stakeholder group is advising on the approach and priorities for achieving a zero emissions fleet.



The guy started this company 14 years ago, stuck with it and created something worth while. Perseverance pays off.


A good decision for the county and Proterra.

A very short 25 miles range is too limited and should be extended to at least 150 miles with larger better batteries.

Articulated 60-ft e-buses is a strong possibility to reduce the number of drivers and increase traffic capacity to meet demand.


Larger buses work with more riders, not all routes have that. Smaller autonomous eBuses can double up for high ridership routes, but still have good capacity use for other routes.


Due to higher efficiency from e-buses, users/cities can afford to use larger buses to reduce the number of very costly drivers by 50%.


Alstom will start operation of its Coradia iLint FC trains in Saxony Germany by December 2017. Twin articulated units with up to 300 passengers @ 140 kph with enough H2 for 800 Km will be used.

PEMFC + lithium batteries are used for better acceleration and braking power recovery.

Alstom will supply H2 + Maintenance for XX years.

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