Fusion's Commercial Turning Point - an interview with Scott Hsu: 3 Key Insights
Fusion's Commercial Turning Point - an interview with Scott Hsu: 3 Key Insights
Mar 10, 2026
In our latest Spark Session event for our FEI Premium subscribers, we sat down with Scott Hsu, former ARPA-E programme director, former US Department of Energy fusion lead and now Fusion Partner at Lowercarbon Capital. Few people have operated across science, policy and venture capital at such pivotal moments for the sector.
Three themes stood out from the discussion: the primacy of leadership in attracting capital; the shift from science projects to commercial milestones; and the scale of the challenge that lies beyond the first pilot plant.
Here are our 3 key insights.
1. Fusion’s next bottleneck is leadership, not physics
Fusion’s historical constraint has been plasma performance. Hsu believes the emerging constraint is company-building capability.
Drawing a clear distinction between public and private funding models, he noted: “In the investment world, they almost put team ahead of tech, whereas at the government, you put tech ahead of team.” Government programmes traditionally assess scientific merit first. Venture investors, by contrast, are underwriting leadership—the ability to raise hundreds of millions of dollars, recruit elite talent and withstand market scrutiny.
Hsu is candid about the current gap: “There’s just right this moment… a lack of world class entrepreneurial talent at fusion companies.” Strong technical founders are essential, but scaling fusion will require CEOs capable of building institutions, not just devices. As capital requirements move into the billions, credibility and execution discipline become decisive.
2. Commercial milestones have replaced open-ended science
A defining shift of the past decade has been cultural. During the 2010s, scientific progress continued but deployment timelines did not. As Hsu put it, “We were not getting a lick closer to putting energy on the grid.”
At ARPA-E and later within DOE, he pushed to frame fusion around finite timelines and techno-economic requirements. The objective became “to enable fusion commercialisation on a finite timescale.” That meant embedding cost, manufacturability and market entry into programme design as core metrics, not as afterthoughts.
The effects are now visible. Private capital has surpassed $13bn globally. Power purchase agreements are being signed at prices above $120/MWh, which is a significant departure from the long-held assumption that fusion would need to enter markets at $50/MWh to be viable. Commercial discipline has not lowered ambition; it has made fusion investable.
3. Demonstration is only the start; industrial scale is the real test
Even if multiple companies achieve net power in the 2030s, Hsu warns against complacency. The harder challenge comes next: scaling.
“Who’s going to be able to build 10,000 power plants by 2040?” he asks. “We certainly are not capable of building 10,000 power plants by 2040 for countless number of reasons.” Supply chains, fuel availability, regulatory processes and manufacturing capacity remain underdeveloped relative to that ambition.
There is also structural tension. Venture-backed firms must focus on near-term milestones: “All of your capital is being spent on meeting those milestones,” typically within a 12–24 month window. That leaves limited bandwidth for long-term industrial planning.
Proving Q>1 will be a historic scientific achievement. But delivering energy abundance will require something larger: coordinated capital formation, supply chain build-out and industrial-scale execution. Fusion’s commercial era has begun, but its industrial era still needs to be built.
FEI Premium subscribers can watch the full replay of the Spark Session with Scott Hsu in our subscribers hub on Circle.