Constellation Energy

Constellation Energy operates the largest U.S. nuclear fleet (about 31.7 GW) plus wind, solar, and gas plants, supplying carbon-free power to hyperscalers including Microsoft. It runs the Crane Clean Energy Center (restarted Three Mile Island Unit 1) under a Microsoft PPA.

Ecosystem functionThe largest existing nuclear generator turned AI-power supplier, distinguished by restarting retired reactors specifically to serve long-term hyperscaler power purchase agreements.

Business modelSells nuclear/renewable power via long-term PPAs