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I know of Oklo, Helion, and UPower; there may be others. These three were relatively early (2014-2015 or so.)

Of those, only Helion has any hope of a useful outcome. But it is a long shot, not least because of the 3He supply problem.

There's Helion, a supposed fusion power company, but everything about it screams "fraud".

I think Helion is the most credible of all the fusion companies.

Your and Jeff's statements are wholly compatible.

True. :) I mean that the other approaches appear to have obvious showstoppers (mostly engineering ones for DT approaches), while Helion has at least a plausible path to practicality.

(plausible, adj.: superficially fair, reasonable, or valuable but often specious.)

Did you see

https://news.ycombinator.com/item?id=31759753

? One of the projects has a plan to get p-11B closer to working. It didn't seem immediately stupid. It would be great to have a system that doesn't depend on unobtainium.

Maybe in 50 years we will be able to take down the wind turbines, or explore the Kuiper Belt at length.

I don't believe any of the p-11B schemes I've seen. Like, no chance at all.

I would value your analysis of the specific scheme detailed there.

they are mostly sticking to web3 I think