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US firm validates 1.1-GW nuclear fusion plant design to deliver 400 MW electricity
(interestingengineering.com)
That’s incredible. I hope it happens in my lifetime.
this post was submitted on 05 Jun 2026
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Technology
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Amazing. Fusion has been 20 years away since I was in school 50 years ago. I know this isn't the actual reactor but it's a big step - so maybe 10 years now?
Honestly, less. At least less for a working fusion reactor. Probably 10 - 20 before first commercial deployment.
The research confirms the ARC reactor design aligns with known physics
That's...assuring? I guess?
"We aren't completely batshit insane!"
Physically possibility is one thing. Materials and engineering constraints are another thing entirely.
Physically possible =/= Feasible.
1.1 Jiggawatts? Pshaw, not even one lightning bolt.
My bet has always been on Commonwealth Systems getting there first. But they aren't there yet... so time will tell.
Helios also has a really novel reactor, it would be amazing to see that work. It's arguably a much more elegant design than a tokamak.
Sure but who can get to market the fastest and have a product that can easily adapt to the needs of data centers?
Well to be honest, I personally think that data centers are a huge waste of this emerging technology, but yeah, I suppose it's probably a perfect use case for fusion...
My question, is who can miniaturize their technology sufficiently to put it in a spacecraft? When we get fusion reactors in space we'll be able to use electric propulsion to make vehicles with insane range. We could send humans to Jupiter in a matter of months and have plenty of propellant for a return trip in a perfectly reusable vehicle. We already have all the tech for this, all except a suitable power source.
Not in the top five problems of a Jupiter trip.
Power and propulsion aren't in the top 5 problems?
Well enlighten me, what's more important that we haven't figured out?
Just watched a really good and incredibly informative video on this, https://youtube.com/watch?v=nt4rZgndOoE. From what is explained in the video is that this is mostly filing paperwork, they haven't verified their reactor works or that it's able to output power, let alone output more power than what is required to start and maintain a fusion reaction. So over all, a little exciting, but really nothing to get too excited about yet.
Edit: grammar fixes
Ah I was wondering this and my cursory search result was that :
- Their design (ARC) is sound for its physics.
- their design would produce more energy if nothing goes wrong with the hardware.
- The hardware is designed but not built yet.
Basically it's really promising because on paper it should really work as expected. But at the same time without building it, there will be obstacles along the way. The materials could last too little time for it to be commercially viable.
So they seem to be at the very last theoretical step of fusion energy but there is still a huge challenge in actually building the thing and most importantly, it to be viable commercially.
Fusion power is still basically TRL 3 and every time it looks like they might be going to move up a level everyone loses their damn minds. It's not really possible to put a timeline on any of this because the technology doesn't exist yet and we can't simulate in computers what we've never seen before, not with any degree of accuracy.
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Yeah this feels more like a long-shot gamble by a hungry start up that the beginning of a new transformative tech.
Validate sustained 10:1 energy excess and tritium breeding excess, at an economically acceptable price point first.
So we only need 23 of them to power that one new data center in Utah.
Isn't this how Half-Life began?
No, that had nothing to do with fusion or fission. The Resonance Cascade was a quantum event created when Gordon inserted a Xen crystal sample into a Anti-Mass Spectrometer.
They're waiting for you Gordon... In the test chamber
Test chamberrrrrrr
Gordon doesn't need to know all that!
I thought this was 30 years away?
This just says in theory it should work. In practice, it might never work.
(I feel the need to point out that it's been 30 years since people started saying this...)
Oh man though this one is cool - I have a dear dear friend working on this project, and it's absolutely wild. Nothing they're doing is new, exactly but modern magnet designs have enabled SPARC to simultaneously hit a bunch of metrics that were previously entirely reliant on purpose-built machines.
Excerpt from them when I asked them about this yesterday:
While no existing tokamak has reached the same parameters that SPARC will simultaneously, there is empirical evidence in part for all of the major parameters it seeks to reach. the purple dot is ARC, the power plant design, and the red X is ITER, the gigantic international tokamak being built which doesn't take advantage of newer and more powerful magnets (which is what allowed SPARC/ARC to have much smaller volume)
so like yeah, we've built a ton of reactors that could do all this individually and then CFS have managed a system that has combined those results into a single machine and that has been the big goal for years (beyond stopping the plasma from fizzling out). There's still challenges to solve, but this system has cleared all the previous hurdles (barring some of the noncritical ones). It's so damn cool. It's not fusion happening now, the headline is sensationalist, but it's the biggest step forward we've had probably since research into plasma fusion started.
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