Oregon Firm Adds 8.5 GWh Sodium-Ion Battery Storage

ESS, an Oregon-based energy storage company, is betting big on a battery technology that skips lithium entirely and promises to make renewable energy safer and more affordable.

The company signed a letter of intent with Massachusetts-based Alsym Energy to add 8.5 gigawatt-hours of sodium-ion battery storage to its portfolio. That's enough capacity to power hundreds of thousands of homes during peak demand.

Unlike lithium-ion batteries, which have made headlines for catching fire, sodium-ion batteries don't carry the same thermal runaway risks. ESS says the new technology is completely non-flammable, which means simpler installations without expensive air conditioning systems or complex fire suppression equipment.

The safety upgrades translate directly to cost savings. Projects using sodium-ion batteries need less infrastructure, making clean energy storage more affordable for utilities, data centers, and commercial customers.

ESS built its reputation on iron flow batteries designed to store energy for 8 to 24 hours, perfect for shifting solar power from sunny afternoons to evening demand. Now, by adding sodium-ion technology, the company can handle shorter bursts of storage lasting just a few hours, filling a gap that lithium-ion currently dominates.

The Ripple Effect

This partnership does more than diversify one company's product line. It tackles two major challenges facing America's clean energy transition: supply chain security and grid reliability.

The sodium-ion batteries use materials that aren't classified as foreign entities of concern, giving American utilities and developers more control over their supply chains. As renewable energy expands, the grid needs flexible storage options that can balance supply and demand across different timeframes.

Alsym developed its battery platform using AI to speed up the design process, bringing new technology to market faster than traditional research methods. The approach reflects a broader shift in how clean energy companies innovate.

For customers, the benefit is choice. Utilities can now mix iron flow batteries for long-duration storage with sodium-ion systems for quick response needs, building a complete energy storage solution without touching lithium supply chains.

As wind and solar power continue their rapid growth across America, technologies like these make the grid more resilient and reliable. Clean energy isn't just getting cheaper. It's getting smarter and safer too.