US energy storage company Peak Energy has announced Sacramento, California as the site of America's first manufacturing facility dedicated to grid-scale sodium-ion battery energy storage systems, committing up to $71 million (approximately €65 million) to a 183,000 sq ft plant at Metro Air Park, as reported by ESS News.

The facility is expected to produce up to 4GWh of battery systems annually, sufficient to power nearly four million homes, with first shipments of Peak's passively cooled sodium-ion batteries planned for the first quarter of 2027.

Peak Energy's technology uses sodium-ion batteries manufactured with domestic materials, replacing lithium, nickel and cobalt. The company says its passively cooled systems can reduce energy storage costs by 20% and offer 99% guaranteed uptime compared with conventional lithium-ion phosphate batteries.

Peak chose Sacramento following a competitive nationwide site selection process, citing the region's manufacturing talent, proximity to California's growing energy storage market, and strong state and local support. The expansion is backed by a $10.5 million (approximately €9.6 million) CalCompetes tax credit awarded in May 2026.

Peak plans to commercialise the first fully passive grid-scale energy storage system, engineered to operate for more than 20 years without scheduled maintenance and designed as a drop-in replacement for today's battery energy storage systems.

Peak Energy has more than 6GWh of customer commitments already in place. The company says the Sacramento facility will help the United States meet rapidly increasing energy storage demand, driven in part by the expansion of AI infrastructure and data centres.

Peak's confirmed customer pipeline includes a 4.75GWh master supply agreement with Jupiter Power, a 1.5GWh agreement with Energy Vault for AI data centre storage applications, and a sodium-ion cell technology collaboration with GM Ventures, General Motors' venture capital arm, signed in June 2026.

In March 2026, the company also revealed plans to deploy a sodium-ion battery system with RWE Americas in eastern Wisconsin.

As of mid-2026, the US energy storage market sources an estimated 75 to 85% of its battery cells from China, a dependency that creates supply chain vulnerability, trade policy exposure and geopolitical risk. Peak's domestically manufactured sodium-ion platform is positioned as a direct response to this structural challenge.

The new site is expected to create 348 net new jobs across Sacramento and Burlingame, generating economic activity throughout northern California.