The Salt-Powered Shift: A Safer, 25-Year Battery Arrives for Homes

SAN DIEGO, CA – July 08, 2026 – As the first units of UNIGRID’s Na+Casa™ residential batteries are installed in European homes, a quiet but significant shift is underway in the world of home energy. For years, the conversation around solar power and energy independence has been dominated by lithium-ion technology. Now, a UC San Diego spin-off is making a compelling case that the future of home energy storage may be powered by one of the most abundant and stable materials on Earth: salt.

UNIGRID Inc. this week announced the first commercial deliveries of its sodium-ion residential energy storage systems. The move marks a tangible step for a technology long seen as a promising but distant alternative to lithium. With U.S. installations anticipated by the end of 2026, the company is positioning its technology not just as an alternative, but as a superior solution for homeowners grappling with rising energy bills, grid instability, and the realities of a changing climate.

“As residential energy bills rise — especially during extreme weather events such as the record heatwave we are seeing around the world — homeowners need storage that is safe, reliable, and financially sound,” said Darren H. S. Tan, CEO and co-founder of UNIGRID. “With Na+Casa, UNIGRID is moving NCO sodium-ion from just a promising technology to a tangible residential storage product.”

A New Benchmark for Safety and Longevity

For any technology brought inside the home, safety is paramount. This has been a persistent point of concern for some lithium-ion chemistries, which in rare cases can experience thermal runaway—a dangerous, self-perpetuating cycle of overheating that can lead to fire. UNIGRID claims its proprietary NCO sodium-ion chemistry effectively “eliminates any possibility of thermal propagation.”

This isn't just marketing hype. The inherent chemical properties of sodium-ion batteries lend them a significant safety advantage. Independent research confirms that sodium-ion cells generally have higher thermal stability, meaning they can withstand more heat before any risk of failure. Furthermore, UNIGRID's own testing demonstrates that its cells do not exhibit catastrophic thermal runaway, giving them a lower fire risk profile than even the safest mainstream lithium-ion chemistries. Another key safety feature is the ability to fully discharge to zero volts for shipping and storage, a state that would damage a lithium-ion battery but renders a sodium-ion unit inert and safe for transport.

Beyond safety, the system’s promised longevity represents a fundamental change in how homeowners can view energy storage. The Na+Casa™ battery is designed for a 25-year operational lifespan, backed by a rating of over 10,000 full charge-discharge cycles. This is a crucial metric; it means the battery is engineered to last as long as the solar panels on the roof. For homeowners, this transforms the battery from a component that might need a costly mid-life replacement into a permanent piece of a home’s long-term infrastructure. This durability, combined with competitive initial pricing, aims to deliver a lower total cost of ownership over the life of a solar installation.

Powering Through Climate Extremes

As climate change intensifies, homeowners are increasingly turning to battery storage for resilience against grid failures during extreme weather. Yet, the performance of batteries themselves can be compromised by the very conditions they are meant to protect against. Extreme cold can sap a battery's efficiency, while intense heat accelerates degradation and shortens its lifespan.

This is where UNIGRID’s technology presents another tangible difference. The Na+Casa™ system boasts an exceptionally wide operational temperature range, from a frigid -40°C to a scorching 60°C (-40°F to 140°F). Scientific studies support the superior low-temperature performance of sodium-ion chemistries, which often maintain better ion mobility and suffer less performance loss in the cold compared to their lithium-ion counterparts.

This resilience means the battery can be reliably installed in a wider variety of climates—from the freezing winters of the northern U.S. to the blistering summer heat of the Southwest—without requiring complex and expensive external heating or cooling systems. For a family depending on that stored power during a blizzard-induced blackout or a heatwave-driven brownout, that consistent performance is not a luxury, but a necessity.

Reshaping the Global Energy Supply Chain

Perhaps the most profound impact of technology like UNIGRID’s lies beyond the individual home, extending to the global supply chains that underpin the entire green energy transition. The world’s hunger for lithium-ion batteries has created intense pressure on the supply of critical minerals like lithium, cobalt, and nickel. The mining of these materials is often environmentally taxing and concentrated in a few geopolitically sensitive regions, creating a bottleneck for the energy transition.

Sodium-ion technology circumvents this challenge entirely. Sodium is the sixth most abundant element in the Earth’s crust, readily and cheaply available worldwide from sources like seawater and mineral deposits. By designing a battery free of lithium, cobalt, and nickel, UNIGRID is helping to build a more resilient and ethical energy storage supply chain.

This is not a niche endeavor. UNIGRID is scaling production from 200 MWh per year to a planned 2 GWh by 2027 through strategic foundry relationships in Asia, leveraging existing manufacturing infrastructure to accelerate growth. This move mirrors a broader industry trend, with giants like CATL also investing billions in mass-producing sodium-ion batteries. It signals a collective recognition that diversifying battery chemistries is essential for global energy security and for making energy storage truly accessible and sustainable.

Before U.S. homeowners can benefit, UNIGRID must navigate the final regulatory hurdles, primarily securing UL 9540 and UL 1973 certifications, the key safety standards for residential energy storage in North America. With European installations now underway, the company's progress will be watched closely as it works to bring this promising technology to the American market, potentially redefining what homeowners can expect from their investment in energy independence.