Xcimer Energy is an inertial fusion energy company based in Denver, Colorado. Founded in 2022 by MIT alumni Conner Galloway and Alexander Valys, Xcimer is building the world’s most powerful laser to commercialize laser fusion — the only fusion approach that has ever achieved scientific breakeven in the laboratory.
Xcimer was co-founded by Conner Galloway (CEO, CSO) and Alexander Valys (CTO, President). They were undergraduate roommates at MIT and later worked together at Los Alamos National Laboratory. Conner has worked in inertial fusion since 2009, with deep expertise in radiation hydrodynamics and laser system architecture. Alex has built early-stage technology startups since 2002 across fusion, healthcare, and AI.
Xcimer is headquartered in Denver, Colorado, with manufacturing operations in Tucson, Arizona. We partner with numerous national labs, universities, and corporations, including Los Alamos National Laboratory, Lawrence Livermore National Laboratory, Oak Ridge National Laboratory, the Naval Research Laboratory, MIT, University of Rochester, the Naval Research Laboratory, General Atomics, Westinghouse, and others.
More than 150 people work for Xcimer, including engineers, scientists, technicians, and other professionals. The team spans expertise in laser physics, fusion science, pulsed power, optics, materials science, operations, and manufacturing — drawn from national laboratories, aerospace, semiconductor lithography, and academia worldwide.
Xcimer has raised nearly $200 million in its seed and Series A rounds from leading technology and climate investors including Hedosophia, Breakthrough Energy Ventures, Lowercarbon Capital, Prelude Ventures, Emerson Collective, Starlight Ventures, Wireframe Ventures, Leitmotif Ventures, and Gigascale Capital.
Xcimer is backed by nearly $200M from the world’s leading energy and technology investors. We occasionally make room for partners who bring strategic value beyond capital. investors@xcimer.energy