Helion's Fusion Breakthrough: 2028 Energy Deadline Looms
The quest for commercially viable fusion energy took a significant leap forward this week as Helion Energy, a Washington-based startup, announced a crucial milestone. Their Polaris prototype reactor has achieved a plasma temperature of 150 million degrees Celsius, representing three-quarters of the temperature Helion believes is necessary for a functional commercial fusion power plant. This achievement places Helion at the forefront of a rapidly evolving field, attracting substantial investment and intensifying the race to unlock a potentially limitless source of clean energy.
Helion Reaches Key Milestone with Polaris Reactor
“We’re obviously really excited to be able to get to this place,” stated David Kirtley, Helion’s co-founder and CEO, in an interview with GearTech. The breakthrough isn’t just about temperature; Polaris is also the first fusion reactor to operate using deuterium-tritium fuel – a mixture of two hydrogen isotopes. Kirtley explained that this allows them to observe a dramatic increase in fusion power output in the form of heat, validating their approach.
A Competitive Landscape
Helion isn’t alone in this ambitious endeavor. Numerous companies are vying to commercialize fusion power, each employing different technologies and timelines. The potential rewards – a clean, sustainable, and abundant energy source – are driving a surge in investment. This week, Inertia Enterprises secured a $450 million Series A round with backing from Bessemer and GV. Earlier this year, Type One Energy announced a $250 million fundraising effort, while Commonwealth Fusion Systems raised an impressive $863 million last summer, with investors including Google and Nvidia. Helion itself benefited from a $425 million investment last year, with contributions from Sam Altman, Mithril, Lightspeed, and SoftBank.
The 2028 Deadline: A Bold Commitment
While many fusion startups are aiming for the early 2030s to connect to the power grid, Helion has set a far more aggressive target. The company has a contract with Microsoft to deliver electricity starting in 2028. However, this power won’t come from Polaris. It will be generated by Orion, a larger, commercially-scaled reactor currently under construction.
Reactor Designs: A Tale of Two Approaches
Each fusion startup’s path to success is defined by its reactor design and the specific milestones it needs to achieve. Commonwealth Fusion Systems, for example, is focused on heating plasmas to over 100 million degrees Celsius within its tokamak – a doughnut-shaped device utilizing powerful magnets to contain the plasma.
Helion’s approach is distinct. Their reactor requires plasmas approximately twice as hot as tokamaks to function optimally. This difference stems from their chosen reactor configuration.
Field-Reversed Configuration: Helion’s Unique Design
Helion’s reactor utilizes a field-reversed configuration (FRC). The internal chamber resembles an hourglass. Fuel is injected and transformed into plasma at the wider ends. Magnets then accelerate these plasmas towards each other. Initial merging occurs at temperatures around 10 to 20 million degrees Celsius. Subsequently, powerful magnets compress the merged plasma, rapidly increasing the temperature to the achieved 150 million degrees Celsius. This entire process unfolds in under a millisecond.
Direct Electricity Generation: A Key Advantage
Unlike most fusion approaches that extract energy as heat, Helion aims to generate electricity directly from the fusion reaction’s magnetic field. The fusion pulse pushes against the reactor’s magnets, inducing an electrical current that can be harvested. This direct energy conversion method is expected to yield higher efficiency compared to traditional heat-based systems. Over the past year, Kirtley noted, Helion has refined the reactor’s circuits to maximize electricity recovery.
Fuel Choices: Deuterium-Helium-3 and Beyond
Currently, Helion utilizes deuterium-tritium fuel. However, their long-term plan involves transitioning to deuterium-helium-3. While most companies are focused on deuterium-tritium and heat extraction, Helion’s fuel choice is strategic. Deuterium-helium-3 fusion produces more charged particles, which interact more forcefully with the confining magnetic fields, enhancing the efficiency of their direct electricity generation approach.
The 200 Million Degree Celsius Goal
Helion’s ultimate objective is to achieve plasma temperatures of 200 million degrees Celsius – significantly higher than the targets of other companies. This ambitious goal is a direct consequence of their reactor design and fuel selection. “We believe that at 200 million degrees, that’s where you get into that optimal sweet spot of where you want to operate a power plant,” Kirtley explained.
Scientific Breakeven: A Different Focus
When questioned about achieving scientific breakeven – the point where a fusion reaction generates more energy than it consumes – Kirtley shifted the focus. “We focus on the electricity piece, making electricity, rather than the pure scientific milestones.” This pragmatic approach underscores Helion’s commitment to practical energy production.
Helium-3 Production and Future Potential
Helium-3 is relatively scarce on Earth but abundant on the Moon. Helion plans to produce its own fuel initially by fusing deuterium nuclei. In regular operation, while deuterium-helium-3 fusion will be the primary power source, some deuterium-on-deuterium reactions will occur, generating helium-3 that will be purified and reused.
The company has been pleasantly surprised by the ease of refining the fuel cycle. Helion has already demonstrated the ability to produce helium-3 with “very high efficiencies in terms of both throughput and purity.”
Currently, Helion is the only fusion startup utilizing helium-3. However, Kirtley anticipates that others will follow suit. He even hinted at the possibility of selling helium-3 to competitors. “Other folks — as they come along and recognize that they want to do this approach of direct electricity recovery and see the efficiency gains from it — will want to be using helium-3 fuel as well,” he said.
Orion: The Path to Scaled Power Plants
Alongside the Polaris experiments, Helion is actively constructing Orion, a 50-megawatt fusion reactor designed to fulfill their contract with Microsoft. “Our ultimate goal is not to build and deliver Polaris,” Kirtley emphasized. “That’s a step along the way towards scaled power plants.”
The progress at Helion, and within the broader fusion energy sector, represents a pivotal moment in the search for clean, sustainable energy solutions. The 2028 deadline looms large, but with continued innovation and investment, the promise of fusion power is moving closer to reality. The race is on, and Helion is firmly positioned as a leading contender.