The Fusion Pivot: Following the Money from Climate Tech to Defense Contracts

For years, the narrative surrounding fusion startups has been one of clean energy and grid-scale power. But as TechCrunch first reported, the venture capital landscape is shifting, and the money trail is leading away from the power plant and toward the procurement office.

According to reporting from TechCrunch, venture dollars committed to climate tech—the primary engine for fusion funding—have stalled. Fusion is an inherently expensive business, and venture capitalists are increasingly welcoming alternative revenue streams for their portfolio companies. This financial pressure is driving a strategic re-alignment toward national security applications.

The most visible example of this shift is Xcimer. The Denver-based startup, which operates the Phoenix laser system (currently the largest privately owned laser system in the world), recently announced a partnership and investment from RTX. The deal involves funding from RTX Ventures, allowing the conglomerate—which includes defense contractor Raytheon—to explore the application of Xcimer's powerful lasers for its own purposes. While Xcimer intends to use its lasers to develop a power plant by compressing fuel targets to release energy, the current Phoenix system operates at a power level an order of magnitude lower than what is required for energy production—yet it is sufficient to attract defense interest.

This pivot is driven by a change in the nature of modern warfare. TechCrunch reports that the rise of drones has made traditional air defense inefficient; for instance, a U.S. ally once spent $3 million on a Patriot missile to destroy a $200 consumer drone. Laser weapons offer a more cost-effective alternative, firing rapidly using electricity from engines, reactors, or generators.

Other players are similarly integrating with the defense establishment. Pacific Fusion recently signed a memorandum of understanding with the National Nuclear Security Administration (NNSA). The startup has broken ground on a demonstration facility in New Mexico, located near the Los Alamos and Sandia National Laboratories. While the facility's primary goal is to prove the design can generate more power than it consumes, the fusion reactions produced there will be significantly more powerful than those currently used by the government for nuclear weapons experiments.

Whether this is a pivot or a plan depends on who you ask. Carrie von Muench, co-founder and chief operating officer at Pacific Fusion, told TechCrunch that defense applications were "always on our mind." This is bolstered by the company's technical lineage; co-founder and chief technical officer Keith LeChein previously worked at the NNSA, as well as the Lawrence Livermore and Sandia National Laboratories.

Ultimately, the fusion industry is returning to its origins. The sector first emerged from the science of Cold War thermonuclear bombs, and the National Ignition Facility has supported national security for over 25 years. With climate funding tightening, the path to scaling these technologies may no longer be through the energy grid, but through the defense budget.