How TerraPower Uses Molten Salt Storage to Supply Fluctuating Power for AI Data Centers

TerraPower, the nuclear venture established by Bill Gates, is targeting the growing energy needs of artificial intelligence facilities by utilizing a specialized energy storage mechanism built directly into its nuclear reactor design. According to a Bloomberg report, the company intends to reveal its inaugural data center initiative later this year.

What Happened

Nuclear technology startups are actively positioning their systems as dependable sources of constant baseload power for artificial intelligence infrastructure. TerraPower is preparing to announce its first dedicated data center deployment this year, with construction projected to commence in 2027. While the specific client for this upcoming facility has not been revealed, Meta reached an agreement in January to purchase eight Natrium installations from the firm.

This initiative represents TerraPower’s second nuclear installation. The company is already constructing its initial power facility in the state of Wyoming.

Key Highlights

• Planned Data Center Debut: Groundbreaking for TerraPower’s data center power facility is scheduled for 2027, following a project announcement expected this year.
• Molten Sodium Storage: The 345-megawatt reactor design stores surplus heat in a large vat of molten sodium rather than lowering atomic output, allowing it to release extra steam when electricity demand climbs.
• Mitigating Rapid Fluctuations: Data center workloads fluctuate substantially during artificial intelligence model training and query processing, causing sharp shifts that have previously strained natural gas turbines and required expensive battery backups.
• High Capacity Factor: Nuclear plants in the United States operate at maximum output 92.5% of the time, representing the highest capacity factor among power generation types.
• Flexible Operations: While standard nuclear plants ramp output at roughly 5% per minute and small modular reactors ramp at about 10% per minute according to the National Laboratory of the Rockies, TerraPower’s thermal reservoir lets the nuclear unit run steadily at full capacity.
• Prior Commercial Deals: In January, Meta contracted to acquire eight of TerraPower’s Natrium power units.

Why This Matters

Nuclear reactors require substantial capital expenditure, creating strong financial incentives to run them continuously at maximum generation. Running at reduced power lowers revenue, and traditional reactors alter output relatively slowly—adjusting by only about 5% of their rated capacity per minute, while newer small modular designs adjust at roughly 10% per minute, according to findings from the National Laboratory of the Rockies.

Artificial intelligence data centers introduce extreme volatility in power draw because graphics processing units quickly react to prompt execution and training tasks. These severe swings have created operational stress capable of damaging natural gas turbines, frequently forcing operators to rely on expensive battery installations.

TerraPower’s 345-megawatt molten salt-cooled reactor was originally engineered to balance variable output from solar and wind farms. Instead of modulating reactor fission up and down, the system continues splitting atoms at peak capacity and diverts surplus thermal energy into molten sodium. When power requirements surge, this stored thermal energy produces supplementary steam to drive generation turbines. This setup lets the facility maintain a high capacity factor and spread capital costs across sustained operating hours while handling rapid variations in electrical load.

What to Watch Next

TerraPower is expected to announce the specific customer and project details for its first data center site before the end of the year. Groundbreaking for that project is anticipated in 2027, while construction continues on the firm’s primary power installation located in Wyoming.

Frequently Asked Questions

When is TerraPower’s data center facility expected to start construction?

Groundbreaking for the data center generation project is slated for 2027, following an official project announcement scheduled for this year.

How does TerraPower address rapid shifts in electricity demand?

The company maintains steady atomic fission in its 345-megawatt reactor and diverts excess heat into a reservoir of molten sodium. When electrical load spikes, the stored heat generates additional steam to turn turbines, avoiding the need to throttle the reactor.

Who has contracted to buy TerraPower’s Natrium power plants?

While the customer for the planned 2027 data center installation has not been disclosed, Meta agreed in January to acquire eight Natrium power plants from TerraPower.

Source: Reporting based on details published by TechCrunch and Bloomberg regarding TerraPower.