Fusion startup Inertia Enterprises says it has cut the time to make its fuel pellets from several days down to minutes, and it gave TechCrunch AI an exclusive first look at the process. According to TechCrunch AI, that speedup clears one of the 10 barriers the company has to overcome before it can build the first phase of a commercial power plant. It’s a meaningful step for a company that raised $450 million on a big promise.
What actually happened
Inertia’s pitch to investors was to commercialize technology born at the National Ignition Facility (NIF) at Lawrence Livermore National Lab. NIF is the experiment that first produced a fusion reaction releasing more energy than it consumed. The problem: at NIF, making a single fuel pellet can take a week or more and cost a fortune. The lab only makes a handful a year.
CEO Jeff Lawson put it plainly to TechCrunch AI. “But when you really double-click on it, you’re like, wait a minute, they’re only making a handful of them a year,” he said. “I put on my commercial hat and was like, wait a minute, I know the word for this: Prototypes.”
His team went to work turning those prototypes into something you can mass-produce. Inertia grew the fuel crystals in about 30 minutes, a step that takes up to a week at NIF. A full pellet now takes two to three hours to build, and the company says the process can scale to a factory.
Why the fuel is so hard to make
These pellets are not simple. Here’s the build:
- A spherical diamond shell on the outside.
- A thin layer of frozen deuterium and tritium (hydrogen isotopes) just inside.
- A core of gaseous deuterium and tritium.
- A gold casing called a hohlraum that converts laser energy into X-rays to compress the pellet.
Each layer has to be near-perfectly spherical. Small imperfections can disrupt ignition and kill the reaction. So speeding this up without breaking the physics is the whole trick.
The clever part
Inertia gave itself margin. The startup plans to fire a laser four times more powerful than the one at NIF, which means it can tolerate more imperfection in each pellet. That tolerance is what let the team move faster.
“We actually have a lot of margin,” Lawson told TechCrunch AI. “That’s our strategy, to oversize our driver, our laser, to give us lots of margin to go play with in every other part of the system.” The work was done through a public-private partnership with NIF and Lawrence Livermore, and co-founder Annie Kritcher, who designed NIF’s breakeven experiment, gave the team a head start.
Why it matters
Faster fuel isn’t just a speed win. It shrinks a real chokehold: tritium. Tritium is radioactive, runs about $30,000 per gram, and only around 25 kilograms are stockpiled worldwide, according to figures TechCrunch AI cited from the journal Science. Cut the filling time and you hold less of it at once, which means less inventory, smaller facilities, and lower risk.
What stands out here is the framing. Inertia isn’t chasing a new physics breakthrough. It’s taking a proven lab result and asking a factory question: how do you make this a billion times over? That’s why the company is hiring industrial engineers from places like Apple. Fusion’s history is full of scientific milestones that never survived contact with a spreadsheet. Manufacturing is where most of these bets will actually live or die.
A reality check is fair. This clears one of 10 barriers, and a commercial plant that burns 10 pellets per second is still a long way off. But moving from days to minutes on a core cost driver is the kind of unglamorous progress that decides whether fusion becomes a business or stays a demo.
For a fuller look at the process and Inertia’s roadmap, the original report at TechCrunch AI has the details.