The number one bottleneck in greening the grid is transmission - moving the power from here to there. A years long waitlist keeps new solar and wind projects on the drawing board and off the grid. Troy Helming's company has an answer - go underground. His "light saber" technology cuts underground tunnels faster and cheaper than anything else, promises to accelerate green energy, aid fire prevention in California, and to put new power lines under public roads that can't be seen and bother no one.

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