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.

Billionaire and co-founder of OpenAI Inc. Sam Altman will relinquish his chairman role at advanced nuclear technology developer Oklo Inc., paving the way for the two companies to collaborate in the future.

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