Proterra, a leading innovator in heavy-duty electric transportation, announced it has set a world record for driving the longest distance ever traveled by an electric vehicle on a single charge at the Navistar Proving Grounds in New Carlisle, Ind. Proterra’s 40-foot Catalyst E2 max traveled 1,101.2 miles this month with 660 kWh of energy storage capacity.

“For our heavy-duty electric bus to break the previous world record of 1,013.76 miles — which was set by a light-duty passenger EV 46 times lighter than the Catalyst E2 max — is a major feat,” said Matt Horton, Proterra’s chief commercial officer. “This record achievement is a testament to Proterra’s purpose-built electric bus design, energy-dense batteries and efficient drivetrain.”

Proterra first unveiled the E2 back in September 2016 and projected it would have a 350-mile range. The bus’s battery pack, combined with its carbon fiber reinforced polymer (CFRP) body, allows Proterra to achieve its record levels of fuel efficiency. In total, the bus weighs just shy of 15 tons.

“Driven by the best cost savings-per-mile, we believe the business case for heavy-duty electric buses is superior to all other applications, and that the transit market will be the first to transition completely to battery-electric powered vehicles,” said Ryan Popple, Proterra CEO. “Early electric bus adopters like our first customer, Foothill Transit, have paved the way for future heavy-duty applications, like motor coaches and commercial trucks. As we see incumbents and more companies enter the heavy-duty EV market, it has become very apparent that the future is all-electric, and the sun is setting on combustion engine technology.”

The company’s E2 and Catalyst XR bus (also made with composites) have caught the eyes of many investors of the past few years. In June, the company landed $55 million in funding from BMW i Ventures and Al Gore’s Generation Investment Management. The company plans to utilize the investment to increase production at its manufacturing facilities in South Carolina and Los Angeles, while also bolstering research and development efforts at the company’s headquarters in Silicon Valley.