A plan by Microsoft to use the restart of a Three Mile Island nuclear reactor to help power its expanding data centers reflects the tech industry's hopes nuclear energy can be a quick and climate-friendly answer to its massive electricity needs.

But it will be tough to swiftly meet soaring power demand from the data centers behind artificial intelligence with new or resurrected nuclear reactors, as companies will face high regulatory hurdles, potential fuel supply obstacles, and sometimes stiff local and environmental opposition.

Microsoft and Constellation Energy announced a deal to restart a unit at the plant in Pennsylvania on Friday, in what would be the first-ever restart for a data center.