Lex Fridman Podcast17 Nov 2025

#485 – David Kirtley: Nuclear Fusion, Plasma Physics, and the Future of Energy

David Kirtley is a nuclear fusion engineer and CEO of Helion Energy, a company working on building the world’s first commercial fusion power plant by 2028.
Thank you for listening ❤ Check out our sponsors: https://lexfridman.com/sponsors/ep485-sc
See below for timestamps, transcript, and to give feedback, submit questions, contact Lex, etc.

Transcript:
https://lexfridman.com/david-kirtley-transcript

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EPISODE LINKS:
David’s X: https://x.com/dekirtley
David’s LinkedIn: https://bit.ly/4qX0KXp
Helion: https://www.helionenergy.com/
Helion’s YouTube: https://youtube.com/HelionEnergy

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OUTLINE:
(00:00) – Introduction
(03:00) – Sponsors, Comments, and Reflections
(11:35) – Nuclear fission vs fusion
(21:35) – Physics of E=mc^2
(26:50) – Is nuclear fusion safe?
(32:11) – Chernobyl
(38:38) – Geopolitics
(40:33) – Extreme scenarios
(47:28) – How nuclear fusion works
(1:20:20) – Extreme temperatures
(1:25:21) – Fusion control and simulation
(1:37:15) – Electricity from fusion
(2:11:20) – First fusion power plant in 2028
(2:18:13) – Energy needs of GPU clusters
(2:28:38) – Kardashev scale
(2:36:33) – Fermi Paradox

PODCAST LINKS:
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