Twilio co-founder’s fusion power startup raises $450M from Bessemer and Alphabet’s GV

Inertia Enterprises, a fusion power startup co-founded by former Twilio CEO Jeff Lawson, successfully secured $450 million in Series A funding from lead investors Bessemer Venture Partners and Alphabet’s GV in San Francisco this week to accelerate the development of commercial clean energy technology. The massive capital injection is designated for the construction of one of the world's most powerful laser systems, which serves as the technological cornerstone of the company’s ambitious nuclear fusion power plant design. By leveraging high-energy physics, the startup aims to provide a scalable and sustainable solution to the global energy crisis while achieving the long-sought goal of net-gain fusion power. The venture marks a significant career pivot for Jeff Lawson, who transitioned from the software-as-a-service industry to the deep-tech sector following his departure from Twilio. Inertia Enterprises is focusing on inertial confinement fusion, a method that uses intense laser beams to compress and heat fuel pellets to the point where atomic nuclei fuse. This specific approach gained international prominence recently after government labs demonstrated technical breakthroughs, prompting private investors to pour billions into commercializing the process. The new funding reflects a growing confidence among Tier-1 venture capital firms that fusion is moving from theoretical science to an engineering reality. Construction of the high-powered laser facility will represent a major milestone in Inertia's roadmap, as the hardware is necessary to test the stability and efficiency of their proprietary power plant architecture. Unlike traditional fission reactors, fusion offers the promise of near-limitless energy with minimal radioactive waste and no risk of a meltdown. With the support of Alphabet’s investment arm and Bessemer, Inertia Enterprises is now positioned as a well-capitalized competitor in a field that includes other high-profile startups like Commonwealth Fusion Systems and Helion Energy. The company intends to use the facility to prove that their laser-driven method can operate at the frequency and scale required for a localized power grid.