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Tuesday, October 27, 2026
Helion Energy — Technical Profile & Analysis
Deep-dive assessment of the Field-Reversed Configuration architecture, fuel path, and market positioning.
Technology Assessment & Commercial Milestones
Latest coverage — Helion Energy
- FundingSep 16, 2026Fusion funding
Helion funding round grows to $500M amid uncertainty over fusion startup’s Microsoft timeline
Helion Energy secured an additional $35 million in a Series E extension, bringing the total round to over $500 million as it works toward a 2028 power purchase agreement deadline with Microsoft.
- FundingSep 14, 2026Helion Energy
Helion Raises $465 Million Series G Funding Round To Accelerate Commercial Fusion Power Deployment
Helion Energy has secured a $465 million Series G funding round to advance its commercial fusion power systems and expand manufacturing capabilities.
- IndustrySep 14, 2026Helion Energy
OpenAI in talks with Helion Energy to secure fusion power supply
OpenAI is reportedly in discussions with Helion Energy for a future power purchase agreement, signaling a potential offtake market for commercial fusion driven by the energy demands of artificial intelligence.
- IndustrySep 14, 2026Helion Energy
With a headcount topping 800, Helion opens Seattle office in pursuit of fusion energy
Helion Energy has expanded its physical footprint with a new Seattle office to support a workforce that has now grown to 800 employees across its Washington state facilities.
- MilestoneAug 27, 2026Helion Energy
Sam Altman’s fusion startup Helion Energy hits 150 million degree plasma temperature—a milestone that could bring first grid power in 2028
Helion Energy reports achieving a plasma temperature of 150 million degrees Celsius in its Polaris prototype, a key step toward the conditions required for its planned deuterium-helium-3 fusion power plant.
- IndustryAug 26, 2026Helion Energy
OpenAI CEO Sam Altman exits Helion Energy's board as firms explore partnership
OpenAI CEO Sam Altman has resigned from the board of Helion Energy to manage conflicts of interest as the two companies begin to explore a potential power purchase agreement.
- MilestoneAug 24, 2026Helion Energy
Helion Energy starts construction on nuclear fusion plant to power Microsoft data centers
Helion has begun construction on a 30,000-square-foot facility in Everett, Washington, to house its seventh-generation fusion prototype, Polaris, which aims to demonstrate net electricity generation.
- FundingAug 21, 2026Helion Energy
Nuclear fusion startup Helion to build ‘world’s first’ power plant after raising $425 million
Helion Energy has secured $425 million in a new funding round to support the construction of what the company describes as the world's first fusion power plant.
Magneto-Inertial, Pulsed & Alternative Cores
Pulsed compression schemes that explicitly avoid massive static superconducting magnets, prioritising upfront-capex reductions and modular replicability.
Reactor design
Magneto-Inertial / Field-Reversed Configuration (FRC)
Core tech focus
Direct Energy Conversion (induction; no steam cycle)
Key milestones
Microsoft 50 MW PPA (2028 delivery). Polaris commissioning 2025. Orion commercial facility breaking ground.
Holds the industry's singular commercial benchmark: a binding Microsoft 50 MW PPA for 2028 delivery. D-³He + direct induction allows compact high-rep modules suited to hyperscaler siting.
FRC, MTF, sheared-flow Z-pinch and levitated dipole topologies. Helion's magneto-inertial FRC bypasses the thermal steam cycle entirely — plasma magnetic energy directly induces electricity in surrounding coils on expansion. TAE's continuous beam-driven FRC targets p-¹¹B, demanding triple products on the order of 10²⁴–10²⁵ keV·s·m⁻³.
- Pulsed-rep-rate engineering: sustaining 1–10 Hz operation with millisecond-scale energy recovery.
- For aneutronic FRC (TAE), bremsstrahlung scales as Pbrems ∝ Tₑ^½, capping Pfus/Pbrems at ~0.2–0.3 without non-thermal ion distributions.
- For MTF (General Fusion), liquid-metal vortex stability under pneumatic shock and synchronisation of dozens of pistons.
- For sheared-flow Z-pinch (Zap), maintaining kink-stability at commercial pulse repetition rates.
- Elimination of large superconducting magnet assemblies removes the single largest capex line in tokamaks.
- Direct-conversion architectures bypass the 35–40% Rankine/Brayton thermodynamic ceiling, pushing net plant efficiency past 60–70%.
- Liquid-metal first-walls (General Fusion) eliminate first-wall replacement cycles entirely.
Helion holds the industry's singular commercial benchmark — a binding Microsoft 50 MW PPA for 2028. D-³He fuel and direct induction allow compact, high-rep-rate modules suited to hyperscaler data-centre siting. General Fusion offers radical mechanical simplicity by replacing lasers and brittle superconductors with pistons, solving the neutron-wall problem via a rotating liquid-lithium barrier. Zap has demonstrated 1.6 GPa plasma pressure, suggesting magnet-free architectures may be the lowest-capex route.
Sourced from the 2026 Global Fusion Energy Comparison — triple-product physics, DEC architecture, and LCOE framework.
Who built Helion Energy
Operating at the convergence of aerospace engineering and plasma physics, the Helion founding team spent over a decade conducting rigorous, low-profile research before entering the commercial spotlight. Dr. David Kirtley, Chris Pihl, and Dr. George Votroubek originally collaborated within the innovative laboratories of the University of Washington's aerospace program, building on the foundational Field-Reversed Configuration (FRC) physics pioneered by Dr. John Slough. Their deep academic cohesion enabled them to buck industry trends, eschewing giant steam-turbine designs in favor of a sleek, linear magneto-inertial device designed to directly capture electricity via inductive magnetic coils.
David Kirtley
PhD in Aerospace Engineering, University of Michigan
John Slough
PhD in Plasma Physics, Princeton University; Professor Emeritus, University of Washington
Chris Pihl
MS in Aeronautics & Astronautics, University of Washington
George Votroubek
PhD in Plasma Physics, University of Washington
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