On 19 June 2026, Realta Fusion, working with the University of Wisconsin–Madison, drew a few amperes of current at around a hundred volts from charged particles streaming out of the ends of their WHAM mirror device — enough, in their own words, to light a few bulbs. It is worth pausing on how modest that sounds, and how significant it actually is.
This was the first time a private fusion company has converted the kinetic energy of a fusion-relevant plasma directly into electricity, without first turning it into heat. The team has been careful to say what it is not: it is neither net-electric production nor large-scale conversion of fusion-born power. That restraint is exactly why the result deserves attention. A real current in a real circuit is a physical fact, not a press release.
I want to use the occasion to discuss something the fusion community does not talk about often enough — the rather nineteenth-century machine sitting at the heart of almost every twenty-first-century power plant we propose to build.