TerraPower's molten salt storage tackles AI data center swings — SkimNews
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- TerraPower plans to announce its first data center project this year, per Bloomberg, with the power plant expected to break ground in 2027 — its second overall, after the Wyoming plant already under construction
- Meta agreed in January to buy eight Natrium power plants from TerraPower in a separate deal, though TerraPower didn't name the customer for the data-centered project
- TerraPower's 345-MW molten salt-cooled reactor keeps splitting atoms at constant output and stores excess heat in a giant vat of molten sodium, then taps that reservoir to spin extra steam turbines when demand spikes
- Conventional nuclear reactors operate at a 92.5% U.S. capacity factor — the highest of any power source — but can only ramp up or down about 5% of rated output per minute, per the National Laboratory of the Rockies
- Competing SMRs can ramp at about 10% per minute but still lose money at reduced capacity, making 24/7 full-output operation economically essential for any startup's early plants
- AI data center loads swing so rapidly during training and inference that natural gas turbines have broken under the stress, forcing operators to install large battery banks — a problem TerraPower's storage design directly addresses
Why it matters: TerraPower's thermal-storage design lets a single plant earn revenue from AI data center demand spikes while keeping its expensive reactor running at full output — amortizing high nuclear capex over more paid hours. That flexibility, achieved without sacrificing the 92.5% capacity factor of conventional nuclear, is a structural advantage over SMR rivals that must choose between full output and grid responsiveness.
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