Helion Achieves Major Milestone in Fusion Energy Development
Everett, Washington-based fusion energy startup Helion has announced a significant advancement in its pursuit of commercial fusion power. The company revealed that the plasmas within its Polaris prototype reactor have reached an impressive temperature of 150 million degrees Celsius. This achievement is a crucial step toward the operational requirements for a commercial fusion power plant.
David Kirtley, Helion’s co-founder and CEO, expressed his excitement regarding this milestone, stating, “We’re obviously really excited to be able to get to this place.”
Innovative Fuel and Reactor Design
Polaris is notable for utilizing deuterium-tritium fuel, a combination of two hydrogen isotopes, making Helion the first fusion company to employ this specific fuel type. Kirtley noted a dramatic increase in fusion power output, evidenced by heat generation, which aligns with the company’s expectations.
Helion is competing with several other startups in the race to commercialize fusion energy—a potentially limitless source of clean energy that has attracted considerable investment. Recently, Inertia Enterprises announced a $450 million Series A funding round, featuring prominent investors like Bessemer and GV. Similarly, Type One Energy is in the process of raising $250 million, while Commonwealth Fusion Systems secured $863 million from investors including Google and Nvidia. Helion itself raised $425 million last year from a group that included Sam Altman, Mithril, Lightspeed, and SoftBank.
Future Commercialization Plans
While many fusion startups are targeting the early 2030s for grid electricity, Helion has a contract with Microsoft to supply electricity starting in 2028. However, this power will come from a larger commercial reactor named Orion, which is currently under development.
Helion’s reactor design, known as field-reversed configuration, differs from other fusion technologies. The reactor’s chamber resembles an hourglass, where fuel is injected and transformed into plasmas. The plasmas are then accelerated toward one another, merging at temperatures around 10 to 20 million degrees Celsius. Advanced magnetic systems compress this merged plasma, elevating the temperature to 150 million degrees Celsius in a fraction of a second.
Direct Electricity Generation
A key innovation in Helion’s approach is its method of generating electricity. Instead of extracting energy from fusion reactions in the form of heat, Helion utilizes the fusion reaction’s magnetic field to produce electricity. Each pulse from the reactor pushes against its own magnets, inducing an electrical current that can be harvested. This method aims to enhance efficiency compared to traditional fusion approaches.
Kirtley noted that over the past year, Helion has refined its reactor circuits to optimize electricity recovery. While the company currently uses deuterium-tritium fuel, it plans to transition to deuterium-helium-3 in the future. This shift is significant, as deuterium-helium-3 reactions generate more charged particles, making it better suited for Helion’s direct electricity generation strategy.
Helion’s ultimate goal is to reach plasma temperatures of 200 million degrees Celsius, which Kirtley believes is the optimal operating condition for a power plant. When questioned about achieving scientific breakeven—where a fusion reaction produces more energy than it consumes—Kirtley emphasized the company’s focus on electricity generation rather than purely scientific milestones.
Future Prospects and Fuel Cycle Innovations
Helium-3, a key component of Helion’s future fuel strategy, is abundant on the Moon but scarce on Earth. To address this, Helion plans to produce its own helium-3 by fusing deuterium nuclei. While the primary energy source will ultimately be deuterium-helium-3 fusion, some reactions will still involve deuterium, generating helium-3 that can be purified and reused.
Kirtley stated that progress in refining the fuel cycle has been promising, with high efficiency in both throughput and purity. He anticipates that other companies will eventually adopt helium-3 as part of their fuel, hinting at the possibility of supplying it to them in the future.
In addition to its work on Polaris, Helion is committed to developing Orion, a 50-megawatt fusion reactor necessary to fulfill its contract with Microsoft. Kirtley remarked, “Our ultimate goal is not to build and deliver Polaris. That’s a step along the way towards scaled power plants.”
As Helion continues to make strides in fusion energy, the potential for a sustainable and clean energy future remains within reach.
