Oklo said Tuesday that OpenAI CEO Sam Altman was stepping down as chairman of its board and indicated a partnership with the artificial-intelligence company could be on the horizon. Altman, who has served as chairman since 2015,

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

Sam Altman has resigned as chair of Oklo to prevent a conflict of interest as OpenAI considers a possible nuclear energy deal with the start-up to provide its increasing AI power needs.