Proterra impresses again with its entirely battery-powered bus: the Catalyst XR. The South Carolina-based company announced today that its 40-foot bus drove 258 miles on a single charge under test conditions at Michelin’s Laurens Proving Grounds (LPG).

It’s without a doubt an impressive feat to power a ~27,500 lbs vehicle for 285 miles on batteries alone…

Proterra managed to achieve this range with a massive 257 kWh battery pack. The battery pack had 8 separate modules and they plan on offering a 10 modules pack to make sure it can serve any regular transit route in the United States. The company estimates that a 10 modules 321 kWh battery pack could travel more than 300 miles on one charge based on the recent test.

During the max-range test, the bus kept an average speed of 30 mph and consumed 0.8 kWh per mile.

proterra factory

Proterra is one of the rare bus manufacturer to only focus on battery-powered technology and therefore they can design their buses from the ground-up to be completely electric instead of retrofitting an exiting gas-powered bus.

Ryan Popple, Proterra’s CEO, was Director of Finance at Tesla Motors before joining VC firm Kleiner Perkins which is a major investor in Proterra.

The company sold to date more than 110 buses which are currently in operation in transit programs all over the US.

 Here’s a quick video of the range test:

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