Every Fusion Startup That Has Raised Over $100M: The Race to Build Unlimited Clean Energy

Fusion energy is no longer a futuristic dream. Over the past few years, fusion startups have attracted billions of dollars from investors worldwide, signaling a major shift in the future of clean energy.

Once considered a technology that was always “10 years away,” nuclear fusion is now becoming a realistic solution to global energy challenges.

At Jeffkom Story, we explore how these startups are transforming the energy landscape and why investors are betting heavily on fusion technology.

Why Is Fusion Energy Receiving Massive Investments?

Fusion energy recreates the same process that powers the sun. Unlike traditional nuclear fission, fusion combines atoms to generate enormous amounts of energy while producing minimal waste.

Three major technological advancements have accelerated fusion development:

• Powerful computer chips
• Advanced Artificial Intelligence (AI)
• High-temperature superconducting magnets

These innovations have enabled companies to design better reactors, improve simulations, and create smarter control systems.

A major breakthrough happened in 2022 when a U.S. Department of Energy laboratory achieved scientific breakeven, proving that controlled fusion can generate more energy than was used to initiate the reaction.

This milestone significantly boosted investor confidence.

Top Fusion Startups That Have Raised Over $100 Million

1. Commonwealth Fusion Systems (CFS)

Total Funding: Nearly $3 Billion

Commonwealth Fusion Systems is currently the most heavily funded fusion startup.

The company is building SPARC, a tokamak-based reactor in Massachusetts, with plans to launch operations by 2026 or 2027.

Its future commercial plant, ARC, will generate 400 megawatts of electricity in Virginia.

Key investors include:

• Bill Gates
• Breakthrough Energy Ventures
• The Engine

Google has already agreed to purchase half of ARC’s future electricity output.

2. TAE Technologies

Total Funding: $1.79 Billion

Founded in 1998, TAE Technologies uses an advanced field-reversed configuration reactor design.

The company focuses on improving plasma stability to increase fusion efficiency.

Major investors include:

• Google
• Chevron
• New Enterprise Associates

TAE continues to be one of the longest-running private fusion companies.

3. Helion Energy

Total Funding: $1.5 Billion

Helion has one of the industry’s most ambitious goals.

The company plans to deliver electricity by 2028, with Microsoft becoming its first customer.

Helion uses a unique reactor that directly converts fusion energy into electricity without relying on steam turbines.

Investors include:

• Sam Altman
• SoftBank Vision Fund 2
• BlackRock
• Peter Thiel

4. Pacific Fusion

Total Funding: Over $1 Billion

Pacific Fusion emerged with one of the largest Series A funding rounds ever seen in fusion.

The company utilizes electromagnetic pulses instead of lasers to achieve inertial confinement fusion.

CEO Eric Lander, former Human Genome Project leader, heads the company.

5. Shine Technologies

Total Funding: $1 Billion

Shine Technologies is taking a practical business approach.

Instead of waiting decades for fusion electricity generation, the company already sells:

• Medical isotopes
• Neutron testing services
• Radioactive waste recycling solutions

This strategy allows Shine to generate revenue while advancing fusion research.

6. General Fusion

Total Funding: $612 Million

Canada-based General Fusion uses magnetized target fusion technology.

Its innovative system compresses plasma using liquid metal and mechanical pistons.

Despite facing funding challenges in 2025, the company continues developing its LM26 reactor.

Key investor:

• Jeff Bezos

7. Inertia Enterprises

Total Funding: $450 Million

Founded by scientists connected to the National Ignition Facility, Inertia Enterprises focuses on laser-based inertial confinement fusion.

The company aims to commercialize technologies proven in government laboratories.

8. Focused Energy

Total Funding: $400 Million

Focused Energy is developing laser-driven fusion technology in Germany.

The startup is also solving one of fusion’s biggest challenges: manufacturing fuel targets at industrial scale.

9. Tokamak Energy

Total Funding: $336 Million

Tokamak Energy is developing compact spherical tokamak reactors.

Its smaller design could significantly reduce construction costs.

The company is also supplying magnet technology for the UK’s STEP Fusion Program.

10. Zap Energy

Total Funding: $327 Million

Zap Energy avoids expensive superconducting magnets.

Instead, it uses electric currents to generate magnetic fields that compress plasma naturally.

The company is also exploring hybrid fusion-fission power plants.

11. Type One Energy

Total Funding: $269 Million

Type One Energy is building stellarator-based reactors.

The company plans to develop a fusion plant on the site of a retired coal power facility in Tennessee.

Its long-term goal is to supply fusion technology directly to utility companies.

12. Proxima Fusion

Total Funding: €185 Million

Proxima Fusion is betting on stellarator technology.

The company believes its advanced magnetic designs can create more stable plasma for longer durations.

13. Kyoto Fusioneering

Total Funding: $191 Million

Instead of building reactors, Kyoto Fusioneering develops supporting technologies.

Its products include:

• Plasma heating systems
• Heat extraction systems
• Power plant integration technologies

The company could become a critical supplier for the entire fusion industry.

14. Marvel Fusion

Total Funding: $162 Million

Marvel Fusion is developing silicon-based fusion targets that can be manufactured using semiconductor technologies.

The company expects its demonstration facility to be operational by 2027.

15. Thea Energy

Total Funding: $130 Million

Thea Energy uses software-controlled modular magnets to simplify stellarator designs and reduce costs.

16. First Light Fusion

Total Funding: $108 Million

Unlike competitors, First Light Fusion fires projectiles instead of lasers to compress fuel targets.

The company now focuses on licensing its technologies to other energy companies.

17. Xcimer Energy

Total Funding: $100 Million

Xcimer is building ultra-powerful laser systems inspired by the National Ignition Facility.

Its goal is to scale laser fusion into a commercially viable energy solution.

Why Fusion Energy Could Become a Trillion-Dollar Industry

Fusion has the potential to solve some of humanity’s biggest energy problems.

Potential benefits include:

• Near limitless energy supply
• Minimal carbon emissions
• Reduced radioactive waste
• Greater energy independence
• Long-term sustainability

However, commercial success remains a major challenge.

Companies must still prove they can generate electricity efficiently, consistently, and profitably.

Final Thoughts

Fusion energy is entering a new era. What was once considered impossible is now attracting billions of dollars and some of the world’s biggest technology investors.

While commercial fusion plants may still be years away, these startups are accelerating progress faster than ever before.

The coming decade could determine whether fusion becomes one of the greatest technological breakthroughs in human history.

At Jeffkom Story, we continue to bring you the latest startup innovations, emerging technologies, and transformative business stories shaping the future of our world.