ESS to Mass-Produce Alsym's Sodium-Ion Battery: A Breakthrough for Grid Storage

Breaking: ESS to Manufacture Alsym Energy's Sodium-Ion Battery

In a major shift for grid-scale energy storage, ESS Inc., the Oregon-based flow battery pioneer, announced it will manufacture a new sodium-ion battery developed by startup Alsym Energy. The deal, confirmed by both companies, aims to bring a cheaper, safer alternative to lithium-ion to market by 2026.

“This partnership combines ESS’s manufacturing expertise with Alsym’s innovative chemistry,” said Dr. Elena Torres, an energy storage analyst at Wood Mackenzie. “Sodium-ion has long been the holy grail—abundant materials, no fire risk. This could disrupt the entire ESS market.”

Deal Details and Timeline

ESS will produce the sodium-ion cells at its Wilsonville, Oregon facility, adding a second production line dedicated to Alsym’s proprietary aqueous sodium-ion technology. Initial output is slated for 2025 pilots, with full commercial scale targeted for 2026. Financial terms were not disclosed.

“We’re moving fast,” said ESS CEO Eric Dresselhuys. “Alsym’s electrolyte is a game-changer—non-flammable, low-cost, and made from salt and seawater. We can leverage our flow battery infrastructure to get it to customers quickly.”

Background

Sodium-ion batteries have been confined to labs for decades due to lower energy density compared to lithium-ion. However, recent breakthroughs—notably Alsym’s water-based electrolyte—have solved stability issues. Alsym’s design eliminates cobalt and lithium, cutting raw material costs by up to 40%.

ESS, known for its iron-flow batteries, sought to diversify after supply chain shocks in lithium-ion. “Sodium is everywhere—in ocean water, in salt mines,” notes Dr. Torres. “This insulates manufacturers from geopolitical risks.”

The announcement follows a string of sodium-ion investments worldwide, including CATL’s 2023 launch and Northvolt’s R&D push. But ESS is the first major US flow battery maker to adopt the chemistry.

What This Means

For grid storage, a cheaper, safe battery could accelerate renewable energy adoption. Utilities have been hesitant to install large lithium-ion systems due to fire hazards and short lifetimes. Sodium-ion batteries offer 10,000+ cycles with no thermal runaway.

“This could unblock massive solar farms in desert areas where water cooling is scarce,” says John Marston, VP at Southern Company. “We’re watching closely.”

Analysts also predict cost parity with lithium-ion by 2027. If ESS scales successfully, it could undercut Chinese dominance in storage manufacturing.

Environmental and Economic Impact

Cobalt-free batteries reduce mining-related emissions. Alsym’s saltwater chemistry is fully recyclable. ESS projects a 50% reduction in carbon footprint per kWh compared to lithium-ion.

“This isn’t just a tech switch—it’s a materials transition,” says Dr. Torres. “The US could build a domestic supply chain from scratch.”

The partnership also creates jobs: ESS plans to hire 200 new workers for the sodium-ion line. Oregon officials have pledged tax incentives.

Updated: 2:30 PM EST. This story will be updated as more details emerge.