UPS has announced a partnership with Workhorse Group to turn the brand’s iconic brown vans green.

The plan is to deploy 50 plug-in electric delivery trucks that will have the same acquisition cost as a conventional diesel truck, even without government subsidies. If they can meet that target, it would be an industry first and smash a major barrier to EV truck adoption.

It comes as a result of Workhorse and UPS working for four years on refining the company’s electric truck platform. Workhorse Group currently builds conventional gas and diesel chassis for a range of trucks and RVs, including the current generation of UPS trucks.

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Workhorse claims a 400 percent fuel efficiency improvement for the new trucks, along with better performance and a better experience for the driver. The trucks will have a range of around 100 miles. That means that the electric trucks could replace approximately 35,000 vehicles in the current UPS fleet.

“Electric vehicle technology is rapidly improving with battery, charging and smart grid advances that allow us to specify our delivery vehicles to eliminate emissions, noise and dependence on diesel and gasoline,” said Carlton Rose, President, Global Fleet Maintenance and Engineering for UPS. “With our scale and real-world duty cycles, these new electric trucks will be a quantum leap forward for the purpose-built UPS delivery fleet.”

The initial fleet will undergo testing in urban routes across the U.S. Initial test cities will include Atlanta, Dallas, and Los Angeles. The electric trucks will make the fleet not just greener, but quieter in those already noisy urban areas.

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UPS now has more than 300 electric trucks in its fleet between the U.S. and Europe, as well as around 700 hybrids. The parcel delivery company has also placed an order for 125 Telsa Semi electric trucks. The company has set a goal of having one in four new vehicles purchased be alternative fuel or advanced technology vehicles by 2020. It also has pledged to hit 25 percent renewable electricity by 2025.

The announcement also suggests that UPS has had success solving one of the other major hurdles in EV adoption: charging infrastructure.

Last year, UPS announced that it was expanding its electric fleet in London thanks to new charging infrastructure. The project was partly funded by Innovate UK and saw a combination of battery storage and smart charging software to boost charging capacity and capability.

Battery storage ensured that there was enough power to charge the trucks during peak hours. The software makes sure that each truck has the power it needs in the morning.

Charging a full fleet of trucks at the same time puts limitations on how much electricity each vehicle can get, as well as requiring more expensive infrastructure that can handle the demand. The smart charging software balances the load between vehicles based on their expected route the next day. A vehicle that doesn’t need a full charge tomorrow doesn’t get one, meaning more available electricity for other trucks that need it.

The solution allowed the company to triple its electric fleet there and could be used as a template to help spread adoption of the new electric Workhorse trucks.