SpaceX alum nabs $22M to turn rocket engines into geothermal power plants

The race to reinvent geothermal energy just gained a jolt of rocket-fueled momentum. Critical Energy’s $22 million raise to repurpose SpaceX rocket engines for geothermal power plants is more than a clever recycling story—it’s a potential inflection point for baseload renewable energy. Unlike solar and wind, geothermal doesn’t depend on weather or time of day, making it a critical missing piece in the global decarbonization puzzle. Traditional geothermal is limited by the need for specific underground conditions, but using rocket engines—originally designed to withstand extreme heat and pressure—to drill deeper and more efficiently could unlock vast untapped resources. If Critical Energy scales its approach, it might finally deliver scalable, 24/7 clean power that can compete with fossil fuels without subsidies. The company’s ambition to build 300 GW annually by 2045 is staggering: that’s roughly the output of 300 nuclear reactors, or enough to power tens of millions of homes. But scaling from prototype to industrial deployment will require overcoming formidable hurdles. Rocket engines are precision instruments, not industrial drills, and their repurposing demands rigorous adaptation to withstand continuous operation in corrosive underground environments. The $22 million infusion—likely from venture capital and energy tech investors—will fund prototypes and early field tests, but the path to commercial viability hinges on proving reliability at scale. Regulatory approvals, permitting delays, and public acceptance of enhanced geothermal systems (which can trigger minor seismic activity) will also shape its trajectory. This development arrives as geothermal investment accelerates globally, from Iceland to Nevada, driven by climate urgency and energy security concerns. It also reflects a broader tech-to-energy crossover trend, where aerospace and defense technologies find second lives in climate solutions. If successful, Critical Energy’s model could inspire other aerospace startups to pivot toward energy infrastructure, merging high-performance engineering with sustainability. Yet the real test lies in execution: turning rocket science into rock-solid power plants.