“The AI Industrial Explosion — Part 4: Cheap power” by djbinder

In Parts 1, 2, and 3 we estimated how fast a post-AGI economy could grow using existing or historically observed production techniques, grounded in US input-output data. That approach gave us confidence that the methods we assumed were physically realizable, because they correspond to manufacturing processes that have run at scale in the past or run today. Now I would like to relax that constraint, and ask how much faster the economy could grow using more advanced technology. In this part, we will consider energy production. Every physical process consumes energy, and it takes energy to build the production and distribution system that generates energy. The energy payback time (EPBT) for a system is defined as the time required for it to produce the amount of energy required to build it. If, for example, a solar panel requires 100 MJ to construct from raw materials and produces 10 MJ per day, the energy payback time would be ten days. Any economy relying on such panels for energy production has a maximum growth rate that is bounded by this payback time: Even if everything else is essentially free, the solar panels could not reproduce faster than this, and this [...] ---Outline:(02:27) With current technology, energy production is the most tightly bottlenecked sector(06:08) Making materials requires energy(09:44) A minimal solar power system could pay back its embodied energy in days(15:17) As the payback time shrinks, supply-chain lags become the binding constraint(18:44) Even counting the factories, energy production does not preclude doubling in weeks(23:41) Discussion(26:02) Appendix H: Mathematical foundations(26:08) H.1 Payback time and the growth bound(28:08) H.2 Inputs committed at distributed times(29:07) Appendix I: The solar electricity system(29:13) 1.1. System design(29:49) 1.1.1. Panel(34:42) 1.1.2. Collection cabling(36:01) 1.1.3. Power conversion(37:46) 1.1.4. Transmission(40:18) 1.1.5. Storage(43:22) 1.1.6. Transport and field deployment(45:03) 1.2. Lag inventory(46:16) 1.3. Physical capital requirements --- First published: June 22nd, 2026 Source: https://www.lesswrong.com/posts/6fgfn72zoRDomgvrT/the-ai-industrial-explosion-part-4-cheap-power --- Narrated by TYPE III AUDIO. ---Images from the article:Apple Podcasts and Spotify do not show images in the episode description. Try Pocket Casts, or another podcast app.