Realta Fusion claims electrical generation from plasma!

[Astronuc]

TL;DR

Corrected title: changed 'fusiion' to 'plasma'. Fusion didn't provide energy.

Realta Fusion is touting a “first-of-a-kind achievement” for the fusion energy field, having demonstrated direct energy conversion of plasma kinetic energy into electricity.

The Madison-based company yesterday announced it’s the first commercial fusion energy company to achieve the milestone, though the process has been done several times in laboratory settings.

“People have been talking a big game about [direct energy conversion] for years, so we just went out and did it,” CEO Kieran Furlong said in the release.

The company installed and demonstrated its direct energy converter on June 19 using an experimental fusion machine it operates alongside UW-Madison, called the Wisconsin HTS Axisymmetric Mirror, or WHAM. The demonstration involved drawing multiple amps of current at around 100 volts, creating enough electrical power to power multiple lightbulbs.

Direct energy conversion for fusion plays a key role in boosting the system’s efficiency, according to the company.

The initial fusion power plants the company plans to start up in the mid-2030s will get 80% of their energy from a traditional thermal cycle operating at up to 45% efficiency, while the other 20% would come from direct energy conversion, running at greater than 90% efficiency.

https://www.wisbusiness.com/2026/re...a-kind-demonstration-for-fusion-energy-field/

Direct conversion involves separating the electrons from the positively charged nuclei. The electrons are collected as passed through a conductor (and load) and are then recombined with the nuclei (positive charges).

https://www.prnewswire.com/news-rel...plasma-energy-into-electricity-302813632.html

 

[berkeman]

I looked through their website a couple months ago and was reasonably impressed with their technology. I forget if I visited their website because of something on PF or maybe on Facebook. The mechanical design and fabrication are pretty impressive, since the reactor needs to withstand very high pulsating forces.

 

[russ_watters]

Realta Fusion claims electrical generation from fusion!​

By my read, they didn't do that and aren't claiming they did. They converted electricity from plasma - the plasma was not created/sustained by fusion (there was no fusion claimed).

 

[berkeman]

By my read, they didn't do that and aren't claiming they did. They converted electricity from plasma - the plasma was not created/sustained by fusion (there was no fusion claimed).

Huh, I think you're right. So they just created a plasma pulsing between their mirrors and then pulled energy back out of the pulses? Sheesh, what a buzz-kill.

I've been looking for a technical explanation of what they did in this experiment (compared to their fusion articles that I've seen), but no joy so far...

 

[Bystander]

Apocrypha: "...the heat generated from nuclear fusion in the sun approximates that generated by an ordinary compost heap at similar density." i.e., not very many actual fusion events per unit time per unit volume; did the calculation in my head about the time the Pons-Fleischmann fuss occurred (20-30ya?) and concluded they were then, and remain to this day, frauds. Hundred million Kelvin at thousand kilograms per cubic meter?

 

[Astronuc]

Update/Edit: I corrected the title by replacing 'fusion' with 'plasma' to accurately to indicate fusion was not invovled. It is strictly proof of concept on the charge separation, not of the integrated fusion energy generation system.

By my read, they didn't do that and aren't claiming they did. They converted electricity from plasma - the plasma was not created/sustained by fusion (there was no fusion claimed).

Yeah - that is what they did. No fusion; they obtained a plasma then extracted a current from a charge separation or 'direct conversion' system.

MADISON, Wis., June 30, 2026 /PRNewswire/ -- Realta Fusion, the world's leading magnetic mirror fusion energy company, today announced the first ever demonstration of direct energy conversion (DEC) of plasma kinetic energy into electricity by a commercial fusion energy company.

In this first-of-a-kind achievement, Realta successfully demonstrated the ability to draw multiple amps of current at around 100 volts and provide enough electrical power to illuminate several light bulbs.

"People have been talking a big game about DEC for years, so we just went out and did it," said Realta CEO Kieran Furlong. "We're the first private fusion company to achieve DEC of plasma kinetic energy into electricity on a real fusion machine."

Realta first installed and demonstrated its direct energy converter on the Wisconsin HTS Axisymmetric Mirror (WHAM) – the experimental fusion machine it operates in collaboration with the University of Wisconsin-Madison – on June 19th, 2026. The converter works by slowing down charged particles at one end of the machine, which builds up an electrical potential or voltage to drive an electrical current.

https://www.prnewswire.com/news-rel...plasma-energy-into-electricity-302813632.html

However, I believe charge separation from a plasma (or partial plasma) has been achieved before using an MHD system, but I suppose they did it first with a plasma that could be used for fusion, i.e., in a device design to produce a fusion reaction. I studied this technology 40+ years ago. Somewhere I have a textbook on the technology, and examples of direct conversion are described in various fusion technology textbooks that I used in the 1980s.

In an applied magnetic field, positive ions (nuclei) go in one direction and electrons go in the opposite direction - 'charge separation'.

Realta Fusion and Commonwealth Fusion Systems Form Strategic Partnership to Commercialize Magnetic Mirror Fusion Energy
https://www.prnewswire.com/news-rel...-magnetic-mirror-fusion-energy-302728119.html

 

[sbrothy]

This one sentence set off alarms in my unstudied nogging:

People have been talking a big game about DEC for years, so we just went out and did it," said Realta CEO Kieran Furlong.

Disappointed once again. It seems we've been promised that fusion is right around the corner for the last >50 years.