The majority owner of the Susquehanna nuclear power plant, Talen Energy, announced last year that it had sold its data center to Amazon for $650 million in a deal to eventually provide 960 megawatts. That’s 40% of the output of one of the nation’s largest nuclear power plants, or enough to power more than a half-million homes.

Amazon plans to spend $20 billion to build two large data centers in Pennsylvania, including one that will draw power from a nearby nuclear plant. The investment will bring lots of construction jobs,