Microsoft Bought a Nuclear Power Plant for AI

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Microsoft is reopening Three Mile Island to power its AI data centers, signaling a broader industry shift from algorithmic optimization to energy infrastructure. Big tech companies are hitting an 'energy wall' as data center power consumption is set to double, with GPU clusters rendered useless by grid capacity limits. The FERC issued a 2025 ruling allowing data centers to draw up to 900 MW directly from nuclear plants while sharing only 100 MW with the public grid. Companies are betting on Small Modular Reactors (SMRs) — factory-built, truck-deliverable units using advanced fuels like TRISO pebbles and molten salt cooling — placed directly next to server farms. The DOE is pushing 'nuclear AI campuses' that co-locate enrichment, SMRs, data centers, and waste reprocessing. For developers, this means new considerations: energy efficiency metrics (joules per token), carbon-aware batch scheduling via cloud APIs, and a resurgence of Rust and C++ for efficiency gains at scale.

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