Jeff Bezos, founder and chief executive officer of Amazon.com Inc., speaks at the National Press Club in Washington, D.C., on Thursday, Sept. 19, 2019.

CEO Jeff Bezos said Thursday that Amazon has ordered 100,000 electric delivery vehicles from start-up Rivian Automotive in a push to make the company's fleet run entirely on renewable energy.

The order, which was confirmed via tweet by David Clark, Amazon's senior vice president of operations, is the largest order for electric delivery vehicles to date.

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"[We] will have prototypes on the road next year, but 100,000 deployed by 2024," Bezos said during comments at the National Press Club in Washington, D.C. "So a lot of these things, we don't have magic crystal balls to look into the future, but those are a pretty good timeline."

Amazon's purchase comes as part of its plan to convert its delivery fleet to 100% renewable energy by 2030. The e-commerce retailer already runs 40% of its fleet on renewable energy.