Data Center Debate, with Philip Johnston (CEO of Starcloud)

As constraints on energy, water, and permitting collide with exploding demand for AI and compute, a once-fringe idea is moving rapidly toward the center of the conversation: putting data centers in space. Starcloud believes orbital infrastructure isn’t science fiction—it’s a necessary extension of the global compute stack if scaling is going to continue at anything close to its current pace. Founded by Philip Johnston, Starcloud is building space-based compute systems designed to compete on cost, performance, and scale with terrestrial data centers. The company has already flown a data center–grade GPU in orbit and is now working toward larger, commercially viable systems that could reshape where and how AI is powered. We discuss: How energy and permitting constraints are reshaping the future of compute Why space-based data centers may be economically inevitable, not optional What Starcloud proved by running an H100 GPU in orbit How launch costs, watts-per-kilogram, and chip longevity define the real economics The national security implications of who controls future compute capacity • Chapters • 00:00 - Intro 00:50 - The issue with data centers 02:20 - Explosion of the data center debates 04:58 - Philip's 5GW data center rendering and early conceptions of data centers in space at YC 08:16 - Proving people wrong 11:17 - The team at Starcloud today 12:29 - Competing against SpaceX's data center 14:42 - Sam Altman's beef with Starlink 16:52 - Economics of Orbital vs Terrestrial Data Centers by Andrew McCallip 21:33 - Where are we putting these things? 23:50 - Latency in space 25:59 - Political side of building data centers 28:36 - Starcloud 1 30:16 - Space based processors 30:51 - Shakespeare in space 32:00 - Hardening an Nvidia H100 against radiation and making chips in space economical 34:43 - Cooling systems in space 36:01 - How Starcloud is thinking about replacing failed GPUs 38:46 - The mission for Starcloud 2 40:05 - Competitors outside of SpaceX 40:49 - Getting to economical launch costs 44:35 - Will the next great wars be over water and power for data centers? 46:25 - What keeps Philip up at night? 47:11 - What keeps Mo up at night? • Show notes • Starcloud’s website — https://www.starcloud.com/ Philip’s socials — https://x.com/PhilipJohnston Mo's socials — https://x.com/itsmoislam Payload’s socials — https://twitter.com/payloadspace / https://www.linkedin.com/company/payloadspace Ignition’s socials — https://twitter.com/ignitionnuclear / https://www.linkedin.com/company/ignition-nuclear/ Tectonic’s socials — https://twitter.com/tectonicdefense / https://www.linkedin.com/company/tectonicdefense/ Valley of Depth archive — Listen: https://pod.payloadspace.com/ • About us • Valley of Depth is a podcast about the technologies that matter — and the people building them. Brought to you by Arkaea Media, the team behind Payload (space), Ignition (nuclear energy), and Tectonic (defense tech), this show goes beyond headlines and hype. We talk to founders, investors, government officials, and military leaders shaping the future of national security and deep tech. From breakthrough science to strategic policy, we dive into the high-stakes decisions behind the world’s hardest technologies. Payload: www.payloadspace.com Tectonic: www.tectonicdefense.com Ignition: www.ignition-news.com