Constellation Energy plans to reopen Pennsylvania’s Three Mile Island nuclear plant, the site of the worst nuclear accident in U.S. history, to help Microsoft meet the growing need for energy for artificial intelligence.

The Baltimore-headquartered energy company revealed on Friday that it would be restarting the plant’s Unit 1 reactor, which shut down five years ago. The revival would be the latest and most dramatic effort by the industry to meet immense power demand coming from AI-focused data centers being built by tech giants such as Microsoft, Meta, Google, and more.