Peak Energy plans to open America's first dedicated grid-scale sodium-ion battery factory in Sacramento, California, in early 2027, with an annual output of 4 gigawatt-hours. The 183,000-square-foot site represents a $71 million investment and will assemble Chinese-made cells into 30-foot containerized storage systems, each holding 3.1 megawatt-hours.
Sodium-ion batteries move sodium ions between electrodes instead of lithium ions, using nearly identical manufacturing equipment. Sodium is roughly 1,000 times more abundant than lithium in Earth's crust and can be extracted from seawater or common salt deposits. That abundance is the core argument for the chemistry: a battery that does not depend on lithium, cobalt, or nickel supply chains concentrated in a handful of countries.
The stakes are plain. AI data centers are pulling unprecedented electricity, utilities need flexible capacity, and renewable generation is outpacing the grid's ability to absorb it. Sodium-ion's passive cooling and cycle life of up to 20,000 charges could make it a cheaper, safer storage option than lithium-iron-phosphate for utility-scale sites. The Sacramento plant is the first large test of that claim at commercial scale.
Peak Energy, founded in 2023 by former Tesla, Enovix, and Fluence engineers, announced the Sacramento site on July 8, 2026 after a nationwide search that chose California over Texas. The facility sits in the Metro Air Park development near Sacramento International Airport, where SMUD power is already on site. It is an assembly plant, not a cell factory: Peak receives cells made to its specifications by Chinese suppliers and packs them into containerized systems. CEO Landon Mossburg, formerly president of Northvolt North America, says he saw billion-dollar vertical integration unravel at Northvolt, which filed for bankruptcy after trying to make cells from scratch. Peak's capital-light model needs only $71 million to reach 4 GWh of annual output, about 40 times its existing pilot capacity in Burlingame.
What the cells can and cannot do
The chemistry's headline strength is thermal stability. Peak's cells run safely at temperatures up to 55 degrees Celsius, roughly double the typical LFP limit, so the systems need no fluid cooling loops, fans, pumps, or fire-suppression hardware. The design is rated for 20 years without scheduled maintenance. Cycle life reaches up to 20,000 charge-discharge cycles at 80 percent capacity retention, against roughly 8,000 cycles for LFP at 70 percent retention. Round-trip efficiency sits near 96 percent, versus 93 to 94 percent for LFP.
The tradeoff is energy density. Current sodium-ion cells deliver 75 to 175 watt-hours per kilogram, against 175 to 200 for LFP. For grid storage, where volume matters more than squeezing watt-hours into a small package, that gap is acceptable. For electric vehicles and home backup, it is not. Sodium-ion batteries are not available for home use and may never compete with products like the Tesla Powerwall.
Cell cost is also still higher. As of late 2025 sodium-ion packs cost about 30 percent more than LFP at the cell level, with parity expected around 2028. System-level cost is claimed to run about 20 percent below LFP once passive cooling and longer life are counted, but that figure comes from the company and has not been independently verified at scale.
Demand is already lined up
Peak has secured more than 6 GWh of customer commitments, including a deal with Jupiter Power for up to 4.75 GWh through 2030 valued at up to $500 million. Energy Vault has committed 1.5 GWh for AI data center applications, and RWE Americas already deployed Peak's first grid-scale system on the MISO grid in Wisconsin, energized in March 2026. General Motors is codeveloping sodium-ion cells with Peak at its Wallace Battery Cell Innovation Center in Michigan, testing 170- and 190-amp-hour formats with domestic production targeted for 2028. GM battery vice president Kurt Kelty said in June 2026 that Peak's cells are "kicking butt over everything" in testing.
The plant will create 239 jobs over 18 months at an average annual wage above $90,000, backed by a $10.5 million California Competes tax credit awarded in May 2026. Co-founder Cameron Dales said the site was chosen partly to tap the Bay Area's battery engineering talent, describing the region as home to a "Tesla diaspora" of experienced professionals.
China still leads the value chain
The United States is not winning this race on every front. CATL, the world's largest battery maker, unveiled its TENER Sodium storage system in June 2026 with a rated cycle life of 15,000 cycles and a projected 25-to-30-year service life. In April 2026 CATL signed a 60 GWh supply agreement with HyperStrong, the largest sodium-ion deal announced to date. BYD, HiNa Battery, and Farasis are also shipping commercial products, including batteries for a $400 electric scooter already on sale in China.
Peak's own plant depends on Chinese cells. That is a deliberate tradeoff: speed to market now, with a domestic cell program through GM aimed at 2028. The American Battery Leadership Coalition, an industry group advocating for sodium-ion policy support, argues the chemistry can be built almost entirely from American materials, with hard carbon anodes made from coal, sawdust, and agricultural waste. Whether that supply chain materializes is a separate question from whether the first plants get built.
Not every sodium-ion venture has survived. Natron Energy canceled a $1.4 billion North Carolina gigafactory in 2025 after funding ran dry. Bedrock Materials shut down, citing falling lithium prices that eroded sodium-ion's cost advantage. Those failures are the caution: the technology's window depends partly on lithium staying expensive enough to justify the switch.
Timeline and what to watch
First commercial shipments from Sacramento are slated for the first quarter of 2027, with contracted deliveries to Jupiter Power, Energy Vault, and RWE Americas following shortly after. Peak says it needs to deploy over $100 million in product in 2026, up from roughly $10 million in 2025. The Sacramento facility is sized to meet that demand.
At the system level, sodium-ion is already operating on the grid. Peak's 3.5 MWh pilot at the SolarTAC testing facility in Watkins, Colorado has run since 2025, and the Wisconsin deployment backs up the MISO grid serving 15 central U.S. states and Manitoba. California grid operators and AI data center developers will be watching whether the 4 GWh annual output arrives on schedule and whether the claimed 20 percent system cost advantage holds under real operating conditions.
The Sacramento plant is more than one company's expansion. It is the first large-scale test of whether sodium-ion can deliver cheaper, safer, grid-scale storage at a volume that moves the needle for the U.S. electricity system. With 6 GWh of commitments already signed and production set to begin within months, the answer will come soon. If Peak succeeds where Natron and Bedrock failed, the batteries keeping America's lights on may soon run on one of the most common elements on Earth. For more on grid storage and battery chemistry, see our battery tech coverage.
According to Reuters, global battery storage installations are expected to keep rising as data center demand grows, though the pace depends on permitting and grid interconnection timelines.