AWS, Microsoft, and Google are going nuclear to build and operate mega data centers better equipped to meet the increasingly hefty demands of generative AI. Earlier this year, AWS paid $650 million to purchase Talen Energy’s Cumulus Data Assets, a 960-megawatt nuclear-powered data center on site at Talen’s Susquehanna, Penn., nuclear plant, with additional data centers planned — pending approval by the Nuclear Regulatory Agency. Microsoft, Google, and NuScale Power, a maker of small module nuclear reactors known as SMRs, approached Constellation Energy this spring with a request for informatio…