FedEx has jumped on the Tesla bandwagon and has placed a new order for 20 Tesla Semi-electric trucks.

The Tesla Semi fleet will work to replace FedEx’s freight shipping vehicles used for FedEx Freight, its subdivision which handles small cargo as a “less-than-truckload” (LNL) service, operating more than 20,000 trucks around the globe.

According to FedEx, it has replaced roughly 158 million gallons of fuel by substituting older vehicles in its legacy fleet for cleaner technologies including hybrid and natural gas vehicles.

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No word on whether FedEx purchased the base 300-mile or 500-mile range version.

“FedEx has a long history of innovation and incorporating sustainability efforts throughout its global network,” said FedEx Freight president and CEO Mike Ducker in a statement. “Our investment in these trucks is part of our commitment to improving road safety while also reducing our environmental impact.”

FedEx is the latest in a string of large retailers and fleet operations since Tesla’s Semi launch in Nov. 2017, with early purchasers including but not limited to rival UPS’s record 125-truck order to date, along with Anheuser-Busch (40), Walmart (15), and Pepsi (100).

The trucks are scheduled to go into production in 2019.