Three Mile Island Powers Microsoft Data Centers.

Three Mile Island, the power plant near Middletown, Pa., that was the scene of the worst commercial nuclear accident in U.S. history, will reopen to power Microsoft's data centers.

Constellation Energy, which bills itself as America's largest producer of "clean, carbon-free energy," announced Friday that it had signed its largest-ever power purchase agreement with Microsoft.

“Powering industries critical to our nation’s global economic and technological competitiveness, including data centers, requires an abundance of energy that is carbon-free and reliable every hour of every day, and nuclear plants are the only energy sources that can consistently deliver on that promise,” said Joe Dominguez, Constellation Energy's president and CEO.

The deal will create approximately 3,400 jobs and bring in more than $3 billion in state and federal taxes, according to the company. It also said the agreement will add $16 billion to Pennsylvania's GDP.

The agreement will span 20 years, and the plant is expected to reopen in 2028. It will be renamed the Crane Clean Energy Center in honor of Chris Crane, who died in April and served as the CEO of Constellation’s former parent company.