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SpaceX Colossus 2: Tesla Megapacks to Deliver 3.3 GWh Grid Battery
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Fusion42 · 25 September 2026 · Fusion42 review
SpaceX's Colossus 2 AI training campus in Memphis will deploy 3.3 GWh of Tesla Megapacks battery storage, making it likely the largest grid-connected battery in the U.S. The installation is designed to stabilise power transients from GPU workloads and replaces temporary gas turbines, with a 1.2 GW permanent gas plant authorized to come online by mid-2027.
This Wire brief sits within Fusion42's coverage of Clean Energy.
◆ ◆ The Wire takeaway
SpaceX is setting a new scale for battery storage linked to AI compute power, signalling that founders building power-intensive AI or data centres should plan for larger, rapid-response energy storage. Tesla's Megapacks are now proven tech for smoothing massive GPU power swings faster than gas plants can react.
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1 source · 25 Sep 2026
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