Constellation Energy is planning on restarting the undamaged reactor at Three Mile Island near Harrisburg, site of the most infamous nuclear-power accident nationwide, write Jennifer Hiller and Katherine Blunt for The Wall Street Journal.

The idea was born after the company’s chief executive Joe Dominguez attended a small gathering for CEOs last year, where OpenAI co-founder Sam Altman stated that future data centers for certain artificial-intelligence models would likely need as much power as a large city.

“My first reaction is, ‘Wow, these guys are going to be in for a rude awakening about how much power is actually going to be available,’” he said.

Then he considered reopening Three Mile Island could solve several problems. Tech companies require a 24/7 power source for AI and prefer clean energy. However, accessing the country’s packed grid is complicated, and inconsistent output from new wind and solar projects are not reliable solutions.

After months of engineering work and a grueling meeting with Gov. Josh Shapiro to secure his support, Constellation and Microsoft announced in September they had signed a 20-year power-purchase agreement pairing the tech giant’s data centers with clean power from Three Mile Island.

Read more about the plans in The Wall Street Journal.