Inertia Lands $450M to Build Fusion Power on Proven 'Ignition' Science

LIVERMORE, CA – February 11, 2026 – Fusion energy startup Inertia Enterprises has secured a monumental $450 million in Series A funding to commercialize a fusion power plant based on the only scientific approach that has been proven to generate more energy than it consumes. The funding round, one of the largest ever for a first-time fusion venture, signals a powerful surge of investor confidence in the quest for limitless clean energy.

The round was led by Bessemer Venture Partners, with significant participation from GV (formerly Google Ventures), Modern Capital, and Threshold Ventures. The capital injection will fuel Inertia's ambitious plan to build a pilot power plant within the next decade, a goal built upon the historic "ignition" breakthrough achieved at the nearby Lawrence Livermore National Laboratory (LLNL).

Founded just two years ago in 2024, Inertia is not just another name in the crowded field of fusion hopefuls. Its strategy is to directly translate the proven physics of inertial confinement fusion, demonstrated at LLNL’s National Ignition Facility (NIF), into a commercially viable, grid-scale power source.

“Inertia is building on decades of science and billions of dollars invested to reach the ignition milestone that proved the science,” said Jeff Lawson, the co-founder and CEO of Inertia. Lawson, renowned for founding and leading the cloud communications giant Twilio to a multi-billion-dollar public company, brings a rare track record of scaling complex technology to the capital-intensive world of fusion. “Our plan is clear: build on proven science to develop the technology and supply chain required to deliver the world’s highest average power laser, the first fusion target assembly plant, and the first gigawatt, utility-scale fusion power plant to the grid.”

From Lab Breakthrough to Power Grid

The scientific foundation for Inertia’s venture was laid on December 5, 2022, when scientists at NIF for the first time produced more energy from a controlled fusion reaction than the laser energy used to trigger it. In that experiment, 2.05 megajoules of laser energy yielded 3.15 megajoules of fusion energy—a net gain that had been the holy grail of fusion research for over 70 years.

Since that initial success, LLNL has not only repeated the result but has consistently pushed the energy yield higher. Subsequent experiments have produced even greater gains, with one test in April 2025 generating over four times the input energy. This string of successes has transformed inertial fusion from a theoretical possibility into a reproducible scientific reality, providing the bedrock on which Inertia is building its commercial enterprise.

At the heart of this scientific leap is Inertia's co-founder and Chief Scientist, Dr. Annie Kritcher. As the lead designer for the NIF experiments, Kritcher was the architect of the "Hybrid-E" physics design that ultimately achieved ignition. Through a first-of-its-kind agreement, she continues her work at LLNL while steering the scientific vision at Inertia, creating an unparalleled bridge between public research and private commercialization.

“In just three years, we’ve gone from the first experiment to ever produce more fusion energy than was delivered to the target, to repeating that result many times and pushing the target gain higher,” said Kritcher. “We’re now focused on translating physics we know works into a pathway toward commercial-scale fusion energy, and the real benefits it can deliver for people and the planet.”

A 'Dream Team' of Science and Scale

For investors, the combination of proven physics and a uniquely qualified leadership team proved irresistible. Alongside Lawson’s commercial acumen and Kritcher’s unparalleled physics expertise is co-founder and CTO, Prof. Mike Dunne. Dunne joins from Stanford and the SLAC National Accelerator Laboratory, where he directed the multi-billion-dollar LCLS laser facility. His career includes leading the UK's Central Laser Facility and, crucially, running a program at LLNL specifically aimed at designing a power plant based on NIF’s technology.

This trio represents a convergence of the three pillars needed for success: proven business scaling, breakthrough science, and large-scale engineering execution. It's a combination designed to tackle the immense challenge of turning a split-second laboratory event into a continuously operating power plant.

“For the first time, the fusion industry is seeing the alignment of three elements crucial to commercialization: proven physics, public sector partnerships, and private sector investment at the scale needed to deliver,” said Dunne. “It’s our job to capitalize on these elements to build fusion energy that works at grid scale.”

This alignment has attracted top-tier investors who see a de-risked, albeit still ambitious, path forward. “Inertia represents our first investment into the direct fusion market, because it is the first company that we’ve seen with a clear roadmap to commercial energy that’s compelled us to act,” said Byron Deeter, a partner at Bessemer Venture Partners. “With a combination of frontier physics expertise and proven company-building experience, Inertia is unique.”

The Billion-Dollar Engineering Challenge

While the physics may be proven, the engineering journey ahead is formidable. NIF’s success came from a facility designed for research, using 1990s-era laser technology with an electrical efficiency of less than 1%. To generate power for the grid, Inertia must engineer a system that is vastly more efficient and robust.

The company's plan hinges on two core technological developments. The first is "Thunderwall," a new generation of diode-pumped lasers. Each beamline is designed to deliver a 10 kilojoule pulse ten times per second with a wall-plug efficiency of 10%—a monumental leap in performance. The final power plant design envisions a thousand such lasers firing in concert. This represents an average power 50 times greater than any comparable laser system ever built.

The second challenge is industrial-scale manufacturing. The fusion reaction requires tiny, precisely engineered fuel targets, which are vaporized in each shot. Inertia must transition from crafting a few exquisite targets for lab experiments to mass-producing millions of them for under $1 apiece. This requires building an entirely new high-tech supply chain and assembly plant.

These efforts are supported by a favorable and clarifying regulatory landscape in the United States. In 2023, the U.S. Nuclear Regulatory Commission (NRC) decided to regulate fusion systems under a framework designed for particle accelerators, not the far more stringent rules for traditional nuclear fission reactors. This decision, codified by the ADVANCE Act of 2024, provides a much clearer and more manageable path to licensing for companies like Inertia, significantly reducing commercialization risk and timelines.

The investment in Inertia arrives as the global fusion industry is experiencing a historic surge, with private funding now exceeding $7 billion. While most competitors, such as Commonwealth Fusion Systems and Helion Energy, are pursuing magnetic confinement fusion, Inertia's focus on the ignition science already achieved at NIF gives it a distinct and powerful advantage in the race to deliver star power to Earth. The company's ambitious goal to begin construction of a commercial plant in 2030 is now backed by the capital and expertise to potentially turn that vision into reality.