Peak Energy to Build America’s First Sodium-Ion Grid-Storage Factory: $71 Million Sacramento Plant, 4 GWh a Year
- Energy Storage News Utility-Scale BESS
Marin Holt
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- 5 minutes read
- Investment: Up to $71 million
- Annual capacity: 4 GWh
- Jobs created: 239
- Customer commitments: Over 6 GWh
- First shipments: Q1 2027
Peak Energy will build America’s first dedicated grid-scale sodium-ion battery factory in Sacramento, California, committing up to $71 million to a 183,000-square-foot plant that will produce 4 GWh of energy storage a year. The company announced the site selection on July 8, 2026, choosing the Metro Air Park development for a facility that begins production and first shipments in Q1 2027.
The plant will add 239 jobs over 18 months at an average wage above $90,000, backed by a $10.5 million California Competes tax credit awarded in May 2026. Peak already holds more than 6 GWh of customer commitments from Jupiter Power, Energy Vault, and RWE Americas, and its 4 GWh of annual output is enough to serve close to 4 million homes each year. The Sacramento line follows Peak’s first grid-scale sodium-ion deployment, a passively cooled system it energized with RWE Americas on the MISO grid in Wisconsin in March 2026.
Why Sodium-Ion, and Why a US Plant
Sodium-ion cells trade some energy density for a supply chain that avoids lithium, cobalt, and nickel, drawing instead on abundant sodium. Peak’s systems run without the refrigeration that lithium-ion battery enclosures require, which the company says cuts storage costs about 20 percent and holds uptime at 99 percent across a 20-year service life with no scheduled maintenance. A partnership with General Motors, including an investment from GM Ventures, pairs GM’s next-generation sodium-ion cell chemistry with Peak’s storage platform.
Critical Perspective
Peak Energy is committing up to $71 million for a plant sized at 4 GWh a year, with more than 6 GWh already under customer commitment. Yet the first-in-America billing leans on the grid-scale qualifier, since Natron Energy already runs a US sodium-ion line in Michigan aimed at data centers and industry. Northvolt carried more than $50 billion in signed offtake into its Swedish gigafactory and still filed for bankruptcy in late 2024, a reminder that booked demand does not finance a first-of-its-kind line. If Q1 2027 shipments slip, how many of those 6 GWh in commitments convert to revenue rather than walk to an incumbent lithium supplier?
Why It Matters
Nearly all US grid-storage cells today ship from overseas, most of them lithium-ion drawn from a single-country supply chain. A domestic sodium-ion plant with signed offtake and an automaker’s cell technology behind it gives grid operators a second chemistry sourced inside the country, insulated from lithium price swings and import exposure. For California ratepayers, Peak argues that removing battery refrigeration as storage scales could save roughly $100 million a year. The open question is whether a first-of-its-kind line hits its Q1 2027 shipment date and proves sodium-ion economics at grid scale.
