Jeff Lawson leaves Twilio behind to commercialize fusion energy with $450M raise at Inertia Enterprises

Summary

Jeff Lawson, who built Twilio into a $4 billion revenue business over 16 years before taking it public in 2016, has moved into fusion energy commercialization with Inertia Enterprises. The company announced a $450 million raise on a milestone-based structure, with Google Ventures participating as an investor.

Inertia is commercializing inertial confinement fusion, building on the 2022 breakthrough at Lawrence Livermore National Laboratory where scientists achieved net energy gain from a fusion reaction for the first time. Lawson lays out the path to commercialization in three steps: building a laser a million times more powerful than the one at the lab, 20 times more efficient, and one-tenth the size; mass-producing fusion fuel targets in an automated factory; and using both to build a gigawatt-scale power plant capable of supplying energy to roughly a million homes.

Risk framework

Lawson inverts the typical startup risk calculus. In software, demand is the question. You can build anything, but will anyone pay for it? In fusion, demand is certain. The question is purely technical execution. Can you scale the proven physics into a commercial product? That means building supply chains and vendor bases for components that don't yet exist at scale. The company is working with laser diode manufacturers to scale production by roughly a thousandfold, a task Lawson compares to how Apple figures out how to manufacture a billion iPhones each year. It is hard engineering work, but not fundamentally uncertain.

The $450 million is designated for design work and building scaled-down prototypes of both the laser and the target assembly plant to de-risk the technologies before committing capital to the first full-scale power plant.

Customers and capital

When asked about securing commitments from hyperscalers like AWS before construction, Lawson rejects the premise. If the company delivers cheap, clean, safe energy, demand risk disappears. Customers will exist. The focus should be on proving the physics and engineering work, not on finding strategic partners to attract capital. Google Ventures' participation as an investor signals they and others will likely become buyers once Inertia proves out the first plant.

Unlike hard-tech companies early in development that need buyer validation to justify capital raises, Lawson argues his track record and the fundamental nature of the energy problem allow Inertia to focus narrowly on technical de-risking.

Hiring advantage

Lawson sees a hiring advantage in his space. While San Francisco startups compete for foundational AI engineers at inflated valuations, Inertia is hiring mechanical engineers, materials engineers, and industrial engineers. These are the people who have scaled consumer products at Apple or autonomous systems at Waymo. These skill sets matter for taking a lab prototype to a gigawatt power plant.

Macro resilience

Lawson founded StubHub during the 2000 dot-com crash and Twilio during the 2008 financial crisis. He argues startups should focus on fundamentals regardless of macro environment. In those cases, it was customer need. With Inertia, it is the laws of physics. By the time Inertia proves out the first plant, whatever economic narrative dominates today will be long gone.