Inertia Enterprises has cracked one of the most stubborn problems in commercial fusion: making fuel pellets fast enough to actually matter. The startup says it can now grow the crystalline layer of frozen deuterium and tritium inside a diamond shell in about 30 minutes — a process that takes up to a week at the National Ignition Facility (NIF). End to end, a single pellet now takes two to three hours instead of several days.
That’s a big deal because Inertia’s backers handed over $450 million expecting the company to turn NIF science into a profitable power plant. CEO Jeff Lawson put the contrast bluntly. At NIF, ‘they’re only making a handful of them a year,’ he told TechCrunch. ‘I know the word for this: Prototypes.’ The company has been hiring industrial engineers from places like Apple to turn those prototypes into something a factory can churn out.
The physics tolerances here are brutal. Each pellet is a spherical diamond shell with a thin frozen fuel layer inside, and even tiny imperfections can wreck the ignition process. But Inertia has an edge NIF lacks: it plans to use a laser four times more powerful, which gives the team ‘a lot of margin’ to tolerate imperfections and move faster. Chief scientist Annie Kritcher designed NIF’s first net-positive fusion experiment, so the startup isn’t guessing at the physics.
Speed also solves a radioactive headache. Faster filling means less tritium sitting around at any moment — and tritium costs about $30,000 per gram, with only 25 kilograms stockpiled worldwide, per Science. A commercial plant would burn 10 pellets every second. If each one took a week to build, the economics would never close. Lawson frames the win in plain terms: faster pellet production means a smaller facility, less inventory, and a more efficient system overall. That’s the kind of unglamorous engineering work fusion needs if it’s ever going to leave the lab.
