Oklo says its microreactors, called Aurora, have smaller and simpler designs that will range from 15 megawatts to as much as 100 megawatts or more.

Sam Altman, the billionaire co-founder of OpenAI Inc., is stepping down from his role as chairman of Oklo Inc., clearing a path for the advanced nuclear company to more aggressively pursue deals to deliver clean energy to power-hungry artificial intelligence firms.

Altman’s resignation opens up the opportunity for future deals between OpenAI and the nuclear-energy startup. Oklo shares fall after hours.