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GUY RAZ, HOST:

It's ALL THINGS CONSIDERED from NPR News. I'm Guy Raz.

ROBERT SIEGEL, HOST:

And I'm Robert Siegel. The world would be a very different place if we could produce clean energy the same way the sun does by harnessing the kind of nuclear reactions that make the sun shine.

While governments have spent billions of dollars to develop what's called fusion energy, it is still a distant dream. But that hasn't stopped a few upstart companies from trying to do it on the cheap and their ideas are credible enough to have attracted some serious private investment.

NPR's Richard Harris visited one of these companies in the suburbs of Vancouver, British Columbia.

RICHARD HARRIS, BYLINE: There's almost no hint that anything at all unusual is going on in this small business park. There's a food distributor, an engineering firm, small warehouses, usual stuff. But on one door, there's a sign suggesting that all is not normal here. The sign says, General Fusion, and a small warning: Do you have a pacemaker or aid? Speak with a General Fusion employee.

The reason for that caution can be found behind bulletproof walls that surround an experimental machine. This gleaming metal structure could be out of a science fiction movie set. It stands about 15 feet tall, it's crisscrossed with wires and it's covered with aluminum foil. Two men are hunched over an instrument, troubleshooting.

MICHEL LABERGE: That's when you fire for real, right?

UNIDENTIFIED MAN: That's when we...

LABERGE: Yeah.

UNIDENTIFIED MAN: When this charges up and...

HARRIS: The machine is flanked with banks of electrical capacitors which hold and release the amount of energy you find in a stick of dynamite.

(SOUNDBITE OF SIREN)

HARRIS: The siren warns to stay clear. The system is charging up and, with all that electric charge, some piece of hardware could go flying.

(SOUNDBITE OF SIREN)

HARRIS: This plasma ray gun is part of a bigger instrument, which is still under construction. The goal, simply put, is to create a small piece of the sun and harness that energy.

LABERGE: This is an insanely ambitious project.

HARRIS: Michel Laberge is the brains behind this project. He's a physicist and inventor with a rusty beard and a college casual wardrobe. This story really starts a dozen years ago, when the company where he was working asked him to join a hot technology race that had nothing to do with energy. He was asked to build a switch for fiber optics communications cables.

LABERGE: So I was in competition with Nortel, Bell Lab, Lucent. All those guys were putting literally billions of dollars in this project and they gave me, you know, half a million dollar and one guy and he say, OK. Do something that will work better than the other guy. Oh, OK.

HARRIS: And as Laberge tells the story, he actually succeeded.

LABERGE: For half a million dollars, we beat the billion dollar worth of work, so that inflated my head a little bit. I said, hey, look at that. You can beat the big guys if you do something different.

HARRIS: So, on his 40th birthday, he quit his job in what he calls a midlife crisis, took the pile of money he'd earned at his old company and decided to try something really revolutionary. With his PhD in fusion energy, he thought he'd try to beat the big boys in that field.

LABERGE: Reason number one is to save the planet. We are in deep poo-poo.

HARRIS: Fossil fuels will run out and, in the meantime, they are causing global warming. Among the allures is fusion reactors can't melt down and they don't produce significant nuclear waste. And Laberge says, if he succeeds, he could be worth billions.

LABERGE: As for glory, actually, I word that as a negative. I don't want glory. It's just a thing. I don't want anybody to know me, really. Not interested in the glory. I'll take the money, though.

(SOUNDBITE OF LAUGHTER)

HARRIS: He knew he couldn't beat the existing multibillion dollar fusion labs at their own game, so instead, he decided to combine ideas from two current approaches to make a vastly cheaper machine. The general principle behind fusion is simple. If you can fuse together light atoms, you can create heavier atoms, plus lots of energy. The trick is in order to fuse atoms together you need to provide enough energy to heat them up to 150 million degrees.

LABERGE: Other fusion use very complex way of energy, super conducting magnet, laser beam, all sorts of expensive and completed and pricey stuff. So it costs them billions and billions of dollars and that's why it's not so practical, in my opinion. Here, what the energy source is is compressed air. Now, compressed air is dirt cheap.

HARRIS: Think of his idea as a one-two punch. His big electrical gizmo starts to heat up the atoms. Those get injected into a 10 foot wide sphere of swirling molten lead.

LABERGE: The liquid will be circulated with a palm so it spins around and makes a vortex in the center, a bit like your toilet, you know, that hole in the center.

HARRIS: Just as the heated atoms get into the center, Laberge fires 200 pistons powered with compressed air which surround the sphere.

LABERGE: So this is our compressed air gun. They go, pow, pow, boom and send a big compression wave, squash the thing and away you go.

HARRIS: If all goes as planned, squashing the mixture heats it up enough to fuse the atoms and ignite nuclear reactions. The concept is called magnetized target fusion. Laberge didn't invent the idea, but he re-imagined it and, more to the point, he raised $30 million from Amazon.com founder Jeff Bezos and several venture capital firms to see if he can get it off the ground.

Do you think it's going to work?

LABERGE: Of course I think it's going to work. You think I'm going to spend 10 year of my life doing something I think won't work? I think it has a good shot of working. I wouldn't say I'm 100 percent sure this is going to work. That would be a lie. But I would predict a 60 percent chance that this is going to work. Now, of course, other people will give me a much smaller chance than that, but even a 10 percent chance of working, the investor will still put money because this is big, man. This is making power for the whole planet. This is huge.

HARRIS: And the physics concept isn't the only big idea here. Laberge is also pioneering the idea that venture capital firms, which are used to taking big gambles, but expect a quick payback, can sometimes have the patience to invest in a project that they can't just flip in three years. Private funding could change the game for fusion energy.

Richard Siemon used to run the fusion program at Los Alamos National Laboratory, which is part of the multibillion dollar federal research effort. He says radical ideas like this get dreamed up at the big labs, but they get starved for money, which flows mostly to the industrial-sized projects. Sure, he says, those big projects are exploring important physics.

RICHARD SIEMON: But when they are working on a concept and somebody says, yeah, but it's going to cost too much for the customer in the end, that's sort of like a non-issue for a government researcher.

HARRIS: But private investors are only interested in projects that could become commercially viable power sources. That's why Siemon is happy to see private investors taking an interest in fusion energy.

SIEMON: I really think that venture capital might just come in at this point and pick the best fruits off the tree and run with them.

HARRIS: In fact, Laberge's company is not the only one out there using private funds to build reactors based on magnetized target fusion and other novel concepts. Siemon says he's confident someone will eventually figure this out.

SIEMON: Just in the last year, I heard it reported from some technical meetings that China has gotten interested in magnetized target fusion.

HARRIS: And China could easily throw hundreds of millions of dollars at the idea, so venture capitalists could have some serious competition. Laberge, of course, is betting that he will emerge victorious.

Richard Harris, NPR News.

(SOUNDBITE OF MUSIC)

SIEGEL: You can learn more about how this fusion reactor would work and see photos of the massive machine at NPR.org/science.

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