The problem with Helion is that their "Polaris" device isn't working yet. That was supposed to do some fusion and recapture some energy, even if not breakeven. It was supposed to be operational by now.
Success with Polaris would be a big deal. Helion isn't mentioning it much any more. Not good. December 2024 discussion on Reddit.[1] Discussion in the last month on Reddit.[2] Video from Helion that mentions mostly Trenta, the previous machine.[3]
Yet they're pouring concrete for the next machine.
Uh oh.
[1] https://www.reddit.com/r/fusion/comments/1hlojqu/any_news_on...
[2] https://www.reddit.com/r/fusion/comments/1lv4e2h/what_has_ch...