Big Tech has tapped clean energy sources to power the AI boom, which has invigorated interest in the nuclear sector.RelaxFoto.de/Getty ImagesBig Tech is investing in nuclear power to meet AI data center energy demands.Nuclear is seen as a clean energy source, but investors are skeptical about scalability and returns.While VC interest in nuclear startups is growing, startups face key bottlenecks.The generative AI boom has made nuclear power a major new obsession for Big Tech.