Sometimes change, like a train in the old West, gets stopped dead in its tracks. That was the story of Who Killed the Electric Car? The villains were the same guys that always hold things up when real progress is in the air. Pistol-waving lobbyists fighting for their old monopolies, simpleton leaders defending the status quo, and the tendency for most of us to stay in our seats rather than board new trains. So it's a rare privilege to be able to tell the story of how sometimes change has too much momentum to be stopped. You can't kill an idea whose time has come.

For this film, we wanted to do something different. Last time we followed a group of activists fighting from the outside. This time, we follow four entrepreneurs battling from the inside. Each one let us in on their journey over three years on condition that we would not release any footage till 2011. Tesla CEO Elon Musk put his personal fortune on the line. Bob Lutz, GM's Vice Chair, stakes the entire brand on the very technology it once tried to kill. Nissan's CEO, Carlos Ghosn, bets the farm on a car almost no one believes can happen. And my neighbor, Greg "Gadget" Abbott, like thousands of other car converters around the world, sets out to prove you can do it yourself. The challenges they face are as tough as capitalism can be cagey. But the prize if they succeed is really for all of us: the reinvention of the car without gasoline, and potentially without fossil fuel at all.

I hope this film propels audiences to explore electric cars for themselves—because we surely couldn't fit all I've discovered driving electric cars for 12 years into a single film. I can simply say: It's a future we can all be excited about.