The Natrium design stands out for how it handles changing electricity demand. Rather than repeatedly adjusting the nuclear reactor itself, TerraPower can continue producing thermal energy while directing excess heat into an integrated storage system during periods when less electricity is needed. That stored energy can later be used to produce additional steam and increase electrical generation.
The result is a plant designed to combine continuous nuclear generation with more flexible electricity delivery. Natrium can provide a baseline output of 345 megawatts before increasing to 500 megawatts through its energy storage system, a boost of roughly 45%.
That capability could be particularly relevant for data centers running AI workloads, where electricity consumption can change quickly as GPUs move between different tasks. Conventional nuclear plants generally operate most efficiently at high output, creating a mismatch when the electricity they serve fluctuates sharply.
TerraPower originally designed this flexibility around another variable part of the power system: renewable generation. The reactor was intended to complement electricity sources such as wind and solar, requiring a way to adjust the plant’s grid output without constantly changing the underlying nuclear reaction.
AI data centers present a related challenge from the demand side. Instead of electricity supply changing with weather conditions, computing workloads can cause consumption to rise and fall. TerraPower’s storage system gives the plant a way to respond to those swings while keeping the reactor operating.
Existing nuclear reactors generate at maximum power 92.5% of the time in the U.S. and can adjust their output by roughly 5% of rated capacity per minute, according to the National Laboratory of the Rockies. New small modular reactor designs can respond more quickly, at about 10% per minute, but operating below full capacity can reduce the amount of electricity available for sale.
TerraPower’s approach separates nuclear heat production from immediate electricity generation. When demand is lower, thermal energy can be stored rather than forcing the reactor to reduce output. When additional electricity is needed, the plant can draw on that stored heat to drive its turbines.
The company already has a major commitment tied to AI infrastructure. Meta agreed in January 2026 to purchase power from as many as eight Natrium units. Those plants would provide about 2.8 gigawatts of baseload capacity, with the storage systems capable of lifting combined output to approximately 4 gigawatts. Meta’s broader nuclear plans reportedly cover as much as 6.6 gigawatts across multiple projects. The TerraPower units are projected for delivery by 2032.
TerraPower is also advancing its first Natrium project in Wyoming. Construction of Kemmerer Unit 1 is underway after the project received Nuclear Regulatory Commission construction permit approval in April 2026.
The company has separately explored potential connections between Natrium and data center operators. In January 2025, TerraPower signed a memorandum of understanding with Sabey Data Centers to examine potential deployments in the Rocky Mountain region and Texas.
TerraPower is not alone in connecting new nuclear projects with technology companies. Google is backing Kairos Power’s work on fluoride salt-cooled reactors, Amazon has invested in small modular reactor companies, and Microsoft has an agreement involving the restart of a reactor at Three Mile Island.
For TerraPower, however, the defining feature of its approach is the storage system built around Natrium. By keeping the nuclear portion of the plant operating while shifting when some of its thermal energy becomes electricity, the company is positioning its reactor to respond to changing power demand without giving up continuous nuclear generation.
This analysis is based on reporting from CryptoBriefing.
Image courtesy of TerraPower.
This article was generated with AI assistance and reviewed for accuracy and quality.
