Thomas Griffiths

NEW: The AI Data Center "Boom" is Kinda Fake.. But the power bottleneck is still very real. Inside the energy company using rocks & sunlight to fix AI’s power problem right now.. not in 10 years: @ExowattEnergy Most "announced" data centers will never get built (ahem, Stargate). The ones that do? Running on gas generators. And the U.S. grid has no answer for what’s coming. Hannan Happi, CEO & Co-Founder of @ExowattEnergy, joins Sourcery for a rare facility tour of their 40,000 sqft Miami HQ — walking us through the tech, the team, & why the AI power crisis is far worse than the headlines suggest. Exowatt has raised $140M from a16z, Atomic, Felicis, Sam Altman, Leonardo DiCaprio, Starwood Capital, Thrive Capital, & more, all betting on a deceptively simple idea: concentrate sunlight with Fresnel lenses, store the heat in rocks at 1,000°C, and dispatch electricity on demand. 24 hours a day, no grid required. Their P3 system is built from sand, dirt, and steel. Like a large magnified glass and a rock. No lithium. No cobalt. No China. Target cost: 1 cent per kilowatt hour. In this episode: → Why most announced data centers are phantom projects → The real bottleneck that replaced GPUs: skilled labor → How a 200-year-old engine is at the heart of their stack → What hyperscalers actually say about sustainability (it's not pretty) → Lessons from Tesla on iteration, modularity & vertical integration → Why Miami — and why now With a 90+ GWh demand backlog and commercial deployments live in 2025, this might be one of the most important energy companies emerging in the AI era. Founded in 2023 by Hannan Happi & Atomic CEO @jackabraham, Exowatt's mission is to make sustainable renewable energy always available and almost free. 𝐓𝐈𝐌𝐄𝐒𝐓𝐀𝐌𝐏𝐒 (00:00) What is Exowatt? The solar backbone for AI data centers (01:30) Why the US grid simply cannot handle what's coming (02:00) Tour begins: Welcome to Lighthouse Miami — 40,000 sq ft facility (02:45) The P3 explained: three elements, one shipping container (04:00) The founding story: Atomic venture studio and the modular hypothesis (05:30) Why solar thermal hasn't followed solar PV's 99.6% cost decline — until now (07:00) North star: 1 cent per kilowatt hour and where they are today (11:00) Inside the world's largest solar simulator — the sun, indoors (13:00) The Fresnel lens up close: a giant magnifying glass for the sun (15:00) "It's rock science" — the 5-year-old explanation of how it works (17:30) Domestic raw materials (sand, dirt, steel) as the real competitive moat (24:30) The phantom data center problem: most announcements won't get built (26:00) From 100 MW to 10 GW: how data center scale exploded in 3 years (30:00) Funding breakdown: $140M, a16z, Felicis, Sam Altman, Leonardo DiCaprio (37:00) Lessons from Tesla: remove parts, iterate fast, build better