The medium-duty electric trucks will be supplied by Harbinger, an American startup that builds its vehicles in California.

American package delivery giant FedEx will replace 2,000 of its combustion-powered delivery vehicles with all-electric trucks built by Harbinger in the United States.

This is FedEx’s biggest order of Harbinger electric trucks, after last year’s initial order for 53 Class 5 and Class 6 models.

Assembled in California, Harbinger’s electric Class 5 and Class 6 trucks are available in three wheelbase lengths, from 158 inches to 208 inches.

According to Harbinger, all 2,000 vehicles will be built and delivered in the next 18 months.