Among startups in the fusion energy sector, few have garnered as much attention as Helion. Founded 12 years ago, the company enjoys backing from Sam Altman, who is reportedly in discussions with OpenAI, and it has secured an agreement to provide Microsoft with electricity by 2028 — significantly ahead of its rivals.
Helion’s unconventional methods for achieving fusion energy and its tendency towards secrecy have attracted both enthusiasm and skepticism. However, its investors remain unwavering in their support.
Helion revealed on Tuesday that it has secured $425 million in a Series F funding round, elevating its valuation to $5.245 billion. Last month, the startup activated its latest prototype, Polaris, which it aims to be the first fusion reactor capable of generating electricity.
Located within a 27,000-square-foot facility in Everett, Washington, Polaris is Helion’s seventh prototype and was constructed in a little over three years—a rapid pace by fusion industry benchmarks. To meet its ambitious target of supplying Microsoft by 2028, however, Helion will need to accelerate the development of its commercial power plant.
The challenges faced by Helion are reminiscent of those in many other advanced technology sectors.
“In AI, what’s the primary obstacle? Sourcing chips. In fusion, the same applies,” CEO David Kirtley explained in a recent interview with TechCrunch. “Polaris requires 50,000 of these large-scale, pulse-power semiconductor chips, and acquiring them dictates our timeline.”
The company’s strategies for overcoming these challenges bear resemblance to other industries. The latest investment will be directed towards enhancing in-house production capabilities for specialized components. For instance, Helion had to order capacitors—short-term energy storage devices—three years ahead of time.
“Our objective is to transition from relying on suppliers for capacitors for three years to making them ourselves in a much shorter timeframe—ideally within a year or less,” Kirtley stated.
Even though building a supply chain from the ground up poses significant challenges, Kirtley remains upbeat about Helion’s prospects of delivering power to Microsoft within a few years.
“We’ve already been assessing potential sites for the Microsoft facility for a few years,” Kirtley shared. He opted not to disclose a specific location but mentioned ongoing efforts in permitting and grid interconnection, processes that can be lengthy.
A significant part of Helion’s attraction—and what some critics perceive as a risk—is its unique approach to fusion energy, which starkly contrasts with methods employed by other startups in the field.
Broadly, the fusion industry features two prevalent methodologies: Magnetic confinement, which employs powerful magnets to compress plasma to attain the high temperatures and densities necessary for fusion, and inertial confinement, where intense lasers are directed at fuel pellets to compress them until fusion occurs. For a reactor to create sufficient heat for a steam turbine, frequent firings—multiple times per second—are essential.
Helion, however, is developing a novel type of reactor known as a field-reversed configuration reactor. This reactor, resembling an hourglass with a bulge at its midpoint, is encircled by high-strength magnets that channel and compress plasma during each fusion event, referred to as a “pulse” by Helion.
At the commencement of a pulse, Helion introduces a combination of deuterium and helium-3 at each end and heats it to form plasma. The magnets then mold the plasma into a toroidal shape and propel it towards each other at velocities exceeding 1 million miles per hour.
When these plasmas enter the fusion chamber—the bulge of the hourglass—they collide and face additional compression from another series of magnets. This process elevates the plasma temperature to over 100 million degrees Celsius, triggering a fusion reaction akin to how a spark plug ignites fuel in an internal combustion engine.
The energy produced by the fusion process creates a significant increase in magnetic force, which pushes back against the reactor’s magnets, allowing this additional magnetic energy to be converted directly into electricity. Should everything function correctly, Helion’s reactor will produce more electricity from this magnetic burst than was initially required to power the magnets, offering greater efficiency compared to traditional methods that generate steam for turbines.
According to Kirtley, the planned commercial Helion reactor will operate with several pulses per second, generating 50 megawatts of electricity per unit, with the possibility of a power plant containing multiple reactors.
In laboratory settings, Helion has developed smaller systems capable of firing over 100 times per second. The potential exists for future Helion reactors to achieve 60 pulses per second, aligning with the electrical frequency used in power grids. “However, significant engineering challenges remain to reach these high repetition rates while managing the substantial pulse powers involved, typically translating to millions of amperes,” Kirtley explained.
Helion has channeled this recent funding toward advancing the power plant project, which includes expanding its capabilities for in-house machining and capacitor production. “A big factor driving the timeline for Polaris was our ability to produce all the magnetic coils internally, and I want to replicate that for all components,” Kirtley noted.
This latest funding round, while smaller than the previous $500 million raise, saw new investors such as Lightspeed Venture Partners, SoftBank Vision Fund 2, and a major university endowment join existing supporters like Sam Altman, Capricorn Investment Group, Mithril Capital, Dustin Moskovitz, and Nucor.
Compiled by Techarena.au.
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