A Fusion Energy Startup Found a Way to Make Its Fuel Much Faster

Quick background: what is fusion, and why do you need "fuel pellets" for it?

Fusion is the reaction that powers the sun — when you slam light atoms into each other hard enough, huge amounts of energy are released. Scientists have already proven this can work on a small scale on Earth, but turning that into a practical, everyday energy source has proven to be a massive technical challenge, partly because of the modest little fuel pellet at the heart of the process.

Each pellet is a tiny sphere: a diamond shell containing frozen layers of two special forms of hydrogen, packed inside a gold capsule. When a powerful laser hits it, the gold capsule converts that laser light into X-rays, which compress the pellet and trigger the fusion reaction inside it.

Why speed matters here

Until now, growing the crystals needed for these pellets could take nearly a week with existing lab equipment. A startup called Inertia Enterprises has figured out how to grow those same crystals in about 30 minutes, and can now finish a complete pellet in two to three hours instead of multiple days.

That matters enormously for one simple reason: a real, working fusion power plant wouldn't need one pellet a day — it would need about 10 pellets per second. At that scale, saving days on the production time of each pellet is the difference between a lab curiosity and something that could plausibly run as a power plant.

How they pulled it off

The company hired manufacturing engineers from outside the energy world — including people with backgrounds at Apple — specifically to turn a process built for making a handful of research prototypes a year into something that can be mass-produced. Their upcoming laser system is also designed to be four times more powerful than the system used in the original government research, which conveniently means it can tolerate small imperfections in each pellet, making them faster and cheaper to produce.

Why this also matters for one scarce material

Faster pellet production also means the company needs to stockpile less tritium — one of the two types of hydrogen used in each pellet. Tritium is extremely expensive and genuinely scarce (there's only about 25 kilograms of it worldwide), so needing to keep less of it on hand is a real advantage in terms of cost and safety.