David Kirtley: Nuclear Fusion, Plasma Physics, and the Future of Energy | Lex Fridman Podcast #485

Helion Energy CEO David Kirtley explains why fusion is fundamentally safer than fission, how Helion reached 100 million degrees, and why 2028 is a real target for first commercial fusion electricity.

• Helion’s seventh-generation system (Polaris) targets first commercial fusion electricity delivery by 2028, contracted with Microsoft.
• Seawater contains 100 million to 1 billion years of fusion fuel (deuterium) at current global electricity consumption rates.
• Fusion generators hold only 1 second of fuel at any time, making catastrophic runaway or meltdown physically impossible.
• Helion uses pulsed magneto-inertial fusion with field-reversed configurations, not tokamaks; the sixth prototype (Trenta) achieved 100 million degrees and deuterium-helium-3 fusion.
• The US ADVANCE Act (2024) formally codified NRC regulation of fusion under Part 30 (like particle accelerators), not Part 50 (fission reactors), a landmark legal distinction.
• Helion’s team is 50% technicians, not scientists; rapid iteration relies on eBay parts procurement and in-house conveyor-belt manufacturing of power supplies and magnets.
• Direct DC electricity output from fusion is a natural match for data center power, potentially bypassing AC grid conversion losses entirely.
• Proliferation experts actively encouraged Helion to move faster, arguing fusion deployment would reduce pressure to build uranium-enrichment infrastructure globally.

Guests: David Kirtley, CEO of Helion Energy · 2025-11-17 · Watch on YouTube