All forms of transport will eventually become electric.

The first Tesla Model 3s delivered to owners on Friday, July 28. Volvo

Excluding rockets, Musk said he is convinced that all vehicles will eventually be electric.

“Aircraft and ships and all other forms of transport will go fully electric. Not half electric, but fully electric. No question,” Musk said during an interview with Marketplace in 2015.

Musk restated his bold prediction during a panel at the National Governors Association in July.

"There's no question in my mind what so ever that all transport, with the ironic exception of rockets, will go fully electric," Musk said. "Everything. Planes, trains, automobiles, all ships. But it's a question of what that timeframe is."