Venture capitalists in Silicon Valley and other tech hubs are investing money in nuclear energy for the first time in history. That’s changing its trajectory and pace of innovation.

“There’s not been a resurgence of nuclear power, ever, since its heyday in the late 1970s,” Ray Rothrock, a longtime venture capitalist who has personal investments in 10 nuclear startups, told CNBC.

Now, that’s changing. “I have never seen this kind of investment before. Ever.”