Commonwealth Fusion Systems
Facts
- HQ
- Devens
- Sectors
- Energy, Fusion, Clean energy, Deep tech
- Stage
- Private
Private Fusion Funding Tops $4.48B in 2025 as Helion, Backed by Sam Altman, Signs 50 MW PPA with Microsoft for 2028
Private nuclear fusion investments reached a record $4.48 billion in 2025, driven by AI data center energy demand and energy security concerns, with 71% of fusion companies expecting commercial grid power in the 2030s. Helion Energy, backed by Sam Altman, began building its Orion plant in Malaga, Washington, secured a $465 million Series G led by Thrive Capital, and holds a binding PPA to deliver at least 50 MW to Microsoft by 2028.
Helion Energy to Provide Fusion Power to Microsoft Data Center by 2028 Amid $1.5B Funding; Zap Energy Raises $330M with DOE Support
Helion Energy, with $1.5 billion raised, will supply fusion-generated electricity to Microsoft's Central Washington data center by 2028, while rival Zap Energy, backed by $330 million and the U.S. Department of Energy, is also exploring nuclear fission. These moves reflect the urgent demand for power in AI data centers exceeding current grid capacity and the strategic hedging against fusion timeline risks.
Helion Energy Raises $465M, Valued at $15.5B, Targets Commercial Fusion Power by 2028
Helion Energy raised $465 million, increasing its valuation to $15.5 billion, as it aims to commercialize fusion power by 2028 with projects like the 50-megawatt Orion plant in Washington. Despite ambitious plans and partnerships like the one with Microsoft, the company faces skepticism due to technical challenges and limited scientific disclosures.
Helion Energy Secures Permit to Build Reactor Building for Orion Fusion Plant in Washington
Helion Energy has received a permit from Chelan County, Washington, to proceed with building the reactor building for its Orion fusion power plant, aiming to be the world's first commercial fusion facility. Construction is planned to begin in July 2025 near Malaga, Washington, on land leased from the local Public Utilities District.
Helion Energy Raises $425 Million from Sam Altman, SoftBank, and Others, Valued at Over $5.4 Billion to Advance Fusion Power
Helion Energy, a Seattle-area fusion startup, raised $425 million from investors including Sam Altman and SoftBank to advance fusion power development, boosting its valuation above $5.4 billion. The funding emphasizes progress toward clean, carbon-free energy solutions crucial for powering AI data centers.
General Fusion raises $130M with Bezos Expeditions participation, total funding reaches ~$300M as firm readies UK fusion demonstration plant
General Fusion raised $130 million, bringing its total funding to about $300 million, with participation from Jeff Bezos’s Bezos Expeditions; the company will use the funds to advance its fusion technology, build a Fusion Demonstration Plant near London, and expand research facilities in Vancouver and Tennessee.
Helion Raises $500M — Potential $1.7B More — to Build Polaris Fusion Generator, Aiming for 2024 Demonstration in Everett, Wash.
Helion Energy raised $500 million (with up to $1.7 billion more contingent on milestones) to build its Polaris fusion generator and finish a demonstration facility in Everett, Wash., aiming to operate in 2024 and move toward commercializing fusion power.
