Helion, the Sam Altman-backed fusion startup, raises $465M to build a power plant for Microsoft |

Helion, the fusion startup backed by Sam Altman, announced on Thursday that it had raised $465 million in a new funding round that values the…

Sam Altman-backed fusion startup Helion in talks to sell power to OpenAI |

OpenAI CEO Sam Altman is stepping down as board chair of the Helion — the fusion startup he backs — amid reported talks between the…