DAVOS, Switzerland, Jan 16 (Reuters) - OpenAI's CEO Sam Altman on Tuesday said an energy breakthrough is necessary for future artificial intelligence, which will consume vastly more power than people have expected.

Speaking at a Bloomberg event on the sidelines of the World Economic Forum's annual meeting in Davos, Altman said the silver lining is that more climate-friendly sources of energy, particularly nuclear fusion or cheaper solar power and storage, are the way forward for AI.

(Reporting By Jeffrey Dastin in Davos, Switzerland; Editing by Emelia Sithole-Matarise)