With billions in funding and bold timelines, these fusion startups are racing to redefine energy with star power
A New Era of Fusion Hype — and High Stakes
Fusion power, long the punchline of “always a decade away,” is entering a new phase — one defined not by skepticism, but by serious capital, technical breakthroughs, and a new generation of startups.
Three key advances — AI, powerful chips, and high-temperature superconducting magnets — have fueled this boom. Add to that the U.S. Department of Energy’s 2022 net-energy-positive experiment, and investor confidence has skyrocketed.
Here’s a rundown of every fusion startup that’s raised over $100 million, ranked by total funding raised to date.
1. Commonwealth Fusion Systems – ~$3B Raised
- Tech: Tokamak with HTS magnets
- Location: Massachusetts, USA
- Notable Investors: Breakthrough Energy Ventures, Bill Gates, The Engine
- Milestones: SPARC operational by 2026/27; commercial ARC plant to follow near Richmond, VA
CFS leads the private fusion pack, with the SPARC reactor already under construction. Its $863M Series B2 added to a previous $1.8B round, giving CFS one-third of all private fusion funding to date.
2. TAE Technologies – $1.79B Raised
- Tech: Field-Reversed Configuration with particle beam stabilization
- Location: California, USA
- Notable Investors: Google, Chevron, NEA
- Founded: 1998
TAE is one of the oldest players in the game, combining FRC designs with a unique method to stabilize plasma using particle beams. A $150M round in 2024 kept its momentum going.
3. Helion Energy – $1.03B Raised
- Tech: Field-Reversed Configuration with direct energy harvesting
- Location: Washington, USA
- Notable Investors: Sam Altman, Microsoft, BlackRock, KKR
- Target Date: 2028 for first electricity delivery
With Microsoft already signed as a customer, Helion boasts the most aggressive timeline in the industry. Its Polaris prototype is online, and commercial delivery is slated within three years.
4. Pacific Fusion – $900M+ Raised
- Tech: Electromagnetic inertial confinement
- Location: USA
- Notable Investors: Undisclosed (biotech-style tranche payouts)
- Leadership: Eric Lander (Human Genome Project)
With an eye-popping $900M Series A, Pacific Fusion is betting big on an inertial confinement system powered by 156 pulse generators—a high-risk, high-reward strategy.
5. Shine Technologies – $778M Raised
- Tech: Fusion-adjacent; isotope production and neutron testing
- Location: Wisconsin, USA
- Notable Investors: Koch Disruptive Tech, Nucleation Capital
- Focus: Short-term revenue through medical isotopes and waste recycling
Shine isn’t building a fusion reactor—yet. Its pragmatic approach uses near-term applications to generate revenue today while developing fusion expertise for tomorrow.
6. General Fusion – $462.5M Raised
- Tech: Magnetized Target Fusion (liquid metal & plasma compression)
- Location: British Columbia, Canada
- Notable Investors: Jeff Bezos, Temasek
- Current Status: Hit financial troubles in 2025; $22M emergency round secured
A pioneer in MTF, General Fusion hit a cash crisis mid-2025, forcing layoffs and investor pleas. A last-minute funding lifeline gives it a chance to finish the LM26 reactor.
7. Tokamak Energy – $336M Raised
- Tech: Compact spherical tokamak with REBCO magnets
- Location: Oxfordshire, UK
- Notable Investors: In-Q-Tel, Capri-Sun’s Hans-Peter Wild
- Highlight: Reached 100 million°C plasma in 2022
Tokamak Energy shrinks the classic tokamak into a spherical shape to cut costs and boost performance. It’s also diversifying into magnet R&D for wider applications.
8. Zap Energy – $327M Raised
- Tech: Sheared-flow Z-pinch (no external magnets)
- Location: Washington, USA
- Notable Investors: Breakthrough Energy, Chevron, DCVC, Lowercarbon
Zap’s “pinch” method zaps plasma with a current to generate its own self-confined magnetic field. With no need for superconducting magnets or lasers, it’s betting on radical simplicity.
9. Proxima Fusion – €185M+ Raised (~$200M)
- Tech: Stellarator
- Location: Munich, Germany
- Notable Investors: Balderton Capital, Cherry Ventures
Unlike tokamaks, stellarators twist plasma into stable configurations. Proxima is Europe’s top-funded stellarator startup, and one of the few globally betting on this intricate but promising approach.
10. Marvel Fusion – $161M Raised
- Tech: Laser-driven inertial confinement with nanostructured targets
- Location: Munich, Germany
- Notable Investors: Deutsche Telekom, Earlybird, HV Capital
Marvel Fusion is rebuilding inertial confinement fusion with silicon-based targets. Leveraging semiconductor manufacturing tech, it’s aiming for commercial simplicity. A demo facility with CSU is due by 2027.
11. First Light Fusion – $140M Raised
- Tech: Formerly inertial confinement; now pivoted to tech supplier
- Location: Oxfordshire, UK
- Notable Investors: Tencent, IP Group
After struggling to keep up, First Light dropped its reactor ambitions in 2025 and is now building fusion components instead. Once a contender, now a support player.
12. Xcimer Energy – $109M Raised
- Tech: Laser-driven inertial confinement with molten salt shielding
- Location: Colorado, USA
- Notable Investors: Hedosophia, BEV, Emerson Collective, Lowercarbon
Xcimer is reinventing the National Ignition Facility’s laser tech, aiming for a 10-megajoule system five times more powerful than NIF’s. It’s betting that bigger and better lasers are the shortest path to breakeven.
Trends & Takeaways
- Fusion is no longer a pipe dream—it’s a well-funded, multi-pronged race involving diverse technologies: tokamaks, pinch devices, stellarators, laser-driven designs, and even liquid-metal compression.
- Geographic diversity is increasing, with major players in the US, UK, Germany, Sweden, and Canada.
- Most startups are aiming for 2026–2030 for breakeven or first electricity — bold timelines that will be tested in the coming years.
- Trillion-dollar energy markets are the endgame, but technical risk and capital burn remain enormous.
