Since the company was founded 13 years ago in a suburb of Denver, Colorado, Proterra has become the most well-known electric bus manufacturer in North America—and possibly the world. Proterra’s fast-charging technology, which allows its buses to be recharged in as little as 10 minutes, has prompted many former skeptics to rethink the potential of electric bus transit.

Now, Proterra CEO Ryan Popple has made a remarkable prediction that highlights his optimism about the future of electric bus development: By 2020, one-third of all new transit buses will be electric. Furthermore, Popple expects electric buses to account for half of all fleet purchase by 2025, and that by 2030 every new transit bus will be electric.

Coming from anyone else, this prediction might seem a little suspect. But Popple, who has also served as the CEO of Tesla Motors, knows more about the electric vehicle market than just about anyone else in the world. Plus, he’s got the statistics to back up his claim.

Proterra’s electric buses have a low price point that’s already made them fierce contenders against diesel and compressed natural gas (CNG) options. Lithium-ion battery prices are also expected to decline dramatically in the next five years, which could make electric buses even more affordable and appealing to transit companies. In this industry, a low price point can have a huge influence on the purchasing decisions of fleet operators.

If Popple’s predictions are correct, electric buses could soon become the new norm in major cities across the US. For now, we’ll just have to wait and see.