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§ Private Profile · San Francisco, CA, USA
Inertia is a fusion-energy company that builds and generates commercialized fusion powers.
Inertia is a San Francisco, California-based fusion energy company dedicated to building and commercializing fusion power plants, leveraging breakthroughs in inertial fusion energy to deliver clean, virtually limitless, and safe baseload electricity to the global power grid.
Inertia has raised $450.0M across 1 funding round.
Fusion energy is produced by combining light atomic nuclei, releasing immense amounts of energy, similar to the process that powers the sun. It is important because it offers a clean, safe, and virtually limitless energy source with no carbon emissions or long-lived radioactive waste, crucial for global energy security and environmental sustainability.
Inertia plans to commercialize fusion power by leveraging breakthroughs in inertial fusion ignition, developing mass-produced, low-cost lasers and fuel targets. We are refining our technology, securing intellectual property, and establishing partnerships to build gigawatt-scale fusion power plants.
Fusion power offers several key benefits: it's a clean energy source with no greenhouse gas emissions, uses abundant fuel derived from seawater, is inherently safe with no risk of meltdowns, and provides reliable, 24/7 baseload power, unlike intermittent renewables.
Primary challenges include achieving sustained plasma confinement and control, developing materials that can withstand extreme reactor conditions, overcoming complex engineering hurdles in heat extraction and rapid fuel ignition, ensuring economic viability, and establishing a supportive regulatory framework.
Inertia has raised $450.0M across 1 funding round. Most recently, it raised $450.0M Series A in February 2026.
| Date | Round | Lead Investors | Other Investors | Status |
|---|---|---|---|---|
| Feb 11, 2026 | $450M Series A | Bessemer Venture Partners | GV, IQT, Long Journey Ventures, Modern Capital, NEO, Threshold, Uncork Capital, WndrCo | Announced |
[{'heading': 'REVOLUTIONIZING THE POWER GRID WITH FUSION ENERGY', 'content': 'Inertia is at the forefront of the clean energy revolution, developing commercialized fusion power to transform the global energy landscape. Our mission is to provide an abundant, safe, and sustainable energy source, addressing critical needs in clean energy, energy management, and power grid stability. Fusion energy offers a solution with no carbon emissions and minimal long-lived radioactive waste, promising a future powered by a virtually limitless fuel supply derived from readily available resources like seawater.'}, {'heading': "INERTIA'S INNOVATIVE APPROACH TO FUSION", 'content': 'Headquartered in San Francisco, Inertia is pioneering the commercialization of inertial fusion energy. We build upon the scientific achievements of fusion ignition, developing advanced, mass-produced, low-cost lasers and sophisticated fuel targets. Our strategic partnerships, including research agreements with leading institutions, and a robust portfolio of licensed patents underscore our commitment to accelerating the development of gigawatt-scale fusion power plants. This approach aims to overcome long-standing engineering and material science challenges inherent in bringing fusion to market.'}, {'heading': 'THE BENEFITS OF COMMERCIAL FUSION POWER', 'content': 'Commercialized fusion power offers unparalleled advantages. It provides inherently safe operation, free from the risk of meltdowns, and delivers reliable, 24/7 baseload electricity, complementing intermittent renewable sources. Fusion fuel boasts an extraordinarily high energy density, releasing millions of times more usable energy than fossil fuels, all within a small land footprint. Beyond electricity, fusion can supply process heat for industrial applications, supporting economic growth and enhancing national energy independence.'}, {'heading': 'OVERCOMING CHALLENGES AND CHARTING THE FUTURE', 'content': 'While the path to commercial fusion presents challenges, including plasma confinement, material resilience, and economic viability, Inertia is actively addressing these through focused R&D and strategic investment. Our recent Series A funding of $450 million is propelling us towards refining laser and target designs and developing comprehensive plant architectures. We are committed to establishing a robust supply chain and fostering a skilled workforce, laying the groundwork for the construction of demonstration fusion power plants within the next four years, and ultimately, a sustainable energy future.'}]
Fusion energy is produced by combining light atomic nuclei, releasing immense amounts of energy, similar to the process that powers the sun. It is important because it offers a clean, safe, and virtually limitless energy source with no carbon emissions or long-lived radioactive waste, crucial for global energy security and environmental sustainability.
Inertia plans to commercialize fusion power by leveraging breakthroughs in inertial fusion ignition, developing mass-produced, low-cost lasers and fuel targets. We are refining our technology, securing intellectual property, and establishing partnerships to build gigawatt-scale fusion power plants.
Fusion power offers several key benefits: it's a clean energy source with no greenhouse gas emissions, uses abundant fuel derived from seawater, is inherently safe with no risk of meltdowns, and provides reliable, 24/7 baseload power, unlike intermittent renewables.
Primary challenges include achieving sustained plasma confinement and control, developing materials that can withstand extreme reactor conditions, overcoming complex engineering hurdles in heat extraction and rapid fuel ignition, ensuring economic viability, and establishing a supportive regulatory framework.