Helion Fusion Startup Hits 150 Million Degrees in Race Toward 2028 Deadline
Polaris device reaches milestone temperature as company pushes toward commercial power for Microsoft
The achievement represents a key step toward the extreme conditions needed to sustain fusion reactions — the same process that powers the sun. Helion's approach uses a field-reversed configuration to heat and compress fuel to fusion temperatures.
Helion has a power purchase agreement with Microsoft to provide fusion-generated electricity, making this one of the first commercial commitments for fusion energy. The 2028 deadline is aggressive by industry standards, where fusion has famously been "30 years away" for decades.
The company has raised over $570 million in funding, including a $500 million Series E led by Sam Altman. Unlike traditional fusion approaches that aim to use deuterium-tritium fuel, Helion plans to use deuterium and helium-3, which produces fewer neutrons and could simplify reactor design.
While the temperature milestone is impressive, significant engineering challenges remain between achieving high temperatures in a lab device and generating net electricity at commercial scale.
Analysis
Why This Matters
Fusion energy promises virtually unlimited clean power. If Helion can deliver on its timeline, it would represent one of the most significant energy breakthroughs in human history.
Background
Fusion research has been ongoing for over 70 years. Recent private investment has accelerated the pace, with multiple startups pursuing different approaches to achieving commercial fusion.
Key Perspectives
Optimists see each temperature and confinement milestone as bringing fusion closer to reality. Skeptics note that achieving high temperatures is just one of many challenges, and that the gap between lab demonstrations and power plants remains enormous.
What to Watch
Whether Helion can maintain its timeline toward the 2028 Microsoft delivery date, and what the next Polaris milestones look like.