Big Tech is driving a nuclear power revival, energy guru Dan Yergin says

Nuclear power may be making a comeback in the U.S. after years of setbacks — and big tech is the driving force.

As tech giants like Microsoft, Amazon and Google compete to take the lead in the AI revolution, the data centers needed to power the burgeoning technology consume an ever-increasing amount of energy.

In the last two months, those three companies have penned deals to generate more nuclear power — perhaps most notably, Microsoft struck a 20-year agreement with Constellation Energy to restart a reactor at Three Mile Island in Pennsylvania, the site of the most serious nuclear meltdown in U.S. history in 1979. The reopening is planned for 2028.

Speaking to CNBC at the annual International Monetary Fund meetings in Washington, long-time energy market veteran Dan Yergin described the turnaround as nothing short of extraordinary.

"It's amazing, the change. The nuclear industry was in the doldrums," Yergin told CNBC's Karen Tso on Tuesday, describing the reopening of the Three Mile Island power plant as "symbolic."

"Big Tech is saying, 'We need reliable 24 hour electricity. We can't get it just from wind and solar'," he said.

Yergin, who has written several books on energy including "The Prize" and "The New Map," pointed to the booming funding going into the sector. He cited $7 billion in venture capital going into nuclear fusion alone — which does not include financing for nuclear fission, a different energy-generating process.

"This is a really big change, and it reflects in this country, in the United States, a sense that — we've had for, really, a generation of flat demand [for] electricity," Yergin said. "Now it's going to grow, and there's real anxiety about, how do you grow it? And nuclear [energy] is back in form, and