Zinc batteries gain ground as safe, long-duration grid solution

Lincoln Electric System’s addition of a 3-MW/12-MWh zinc battery to its 30-MW Nebraska microgrid marks the utility’s first grid-scale battery installation, boosting capacity by about 10% and enhancing support for critical government infrastructure. This move reflects a broader trend among utilities to explore non-lithium chemistries like zinc for their chemical stability, lower per-unit costs, and safer, non-flammable properties suitable for dense urban environments, while also improving operational flexibility and maximizing the value of renewable assets such as wind power.

The University of Minnesota Morris, in partnership with Otter Tail Power, is pioneering a 1-MW/6-MWh zinc battery installation that integrates seamlessly with its extensive renewable energy portfolio and the utility’s distribution network. Designed for frequent cycling with minimal degradation and capable of operating across Minnesota’s wide temperature ranges without complex thermal management, this system will enhance grid reliability by storing surplus campus-generated wind and solar energy for later use. Supported by public funding and advanced GridMind software from OATI, the project serves as a long-duration demonstration and research platform over its anticipated 20-year lifespan, highlighting zinc battery technology’s promise for northern climates and microgrid-like community settings.

The Mammoth Solar project in West Virginia represents a groundbreaking utility-scale deployment of zinc batteries paired with solar power, aiming to deliver 24/7 carbon-free energy to Google. Valued at $350 million, this initiative leverages zinc battery technology for its cost-effectiveness, sustainability, and safety advantages over lithium-ion, including high round-trip efficiency, use of Earth-abundant materials like zinc and bromine, and zero fire risk. As Jon Yoder of MN8 Energy highlights, zinc batteries support a more resilient supply chain and long-duration storage capabilities critical for reliable, large-scale renewable integration.

Zinc-based batteries, such as those manufactured by Eos Energy Enterprises, stand out for their enhanced safety and chemical stability, making them ideal for dense urban settings and critical infrastructure microgrids. Their non-flammable, aqueous chemistry significantly reduces fire risks compared to lithium-ion alternatives, a crucial advantage for utilities like LES that prioritize both safety and cost-effectiveness by selecting zinc batteries for their lowest per-unit cost and chemical resilience.

Operational flexibility is a hallmark of zinc battery technology, demonstrated by projects like the 30-MW Nebraska microgrid and the University of Minnesota Morris’s 1-MW/6-MWh Eos Z3 system. These batteries not only help reduce peak demand and enhance the value of renewable assets such as wind power but also integrate seamlessly with advanced energy management software like OATI’s GridMind to optimize charge-discharge cycles based on real-time grid conditions, supporting both utility and campus energy needs over an anticipated 20-year lifespan.

Zinc batteries excel in long-duration energy storage, enabling clean energy projects to bridge extended energy gaps that lithium-ion batteries cannot, as seen in the Mammoth Solar project’s 24/7 carbon-free energy delivery. Their ability to operate across wide temperature ranges without extensive thermal management drastically reduces HVAC capital and operational costs, a critical factor for deployments in challenging climates like Minnesota’s northern environment and cold-weather grid projects where HVAC expenses and fire risk are significant constraints.

The strategic integration of WATTMORE’s Intellect Operate EMS and Power Plant Controller with Eos Energy’s DawnOS battery-management platform and Z3 zinc battery systems establishes a pre-integrated controls architecture that significantly reduces deployment complexity. This unified framework, proven at scale in a 3 MW/12 MWh project for Lincoln Electric System in Nebraska, enables scalable and repeatable solutions across utilities, microgrids, data centers, and commercial energy-storage applications, streamlining engineering efforts from design through commissioning.

Leveraging a layered control approach, Eos’ DawnOS manages detailed battery-level monitoring and optimization while WATTMORE’s Intellect Operate platform oversees broader system dispatch, energy optimization, and grid interaction. This seamless integration enhances operational flexibility and grid responsiveness, creating a stronger foundation for customers by combining complementary capabilities across battery technology, controls, and software into a single, cohesive operating environment.

The partnership also ensures regulatory and market readiness by incorporating WATTMORE’s energy management platform, which complies with FEOC and Build America, Buy America (BABA) standards, into Eos’s Z3 product ecosystem. As Nathan Kroeker, Eos’s Chief Commercial Officer, highlights, this collaboration meets growing customer demand for integrated, simplified energy storage solutions across diverse sectors, reinforcing Eos’s ability to deliver comprehensive, scalable projects for utilities, data centers, and microgrids.

The zinc battery storage project in Lincoln, backed by nearly $150 million in federal funding from the Bipartisan Infrastructure Law, exemplifies a cost-effective strategy to enhance grid reliability and reduce energy costs in New England. Beyond energy benefits, this initiative is a cornerstone of a broader sustainable redevelopment of the former mill site, which includes a biofuel plant and workforce housing, collectively aiming to restore around 1,000 jobs and stimulate local economic growth.

Zinc battery technology is emerging as a sustainable and economically viable solution for long-duration energy storage, crucial for achieving 24/7 carbon-free power. The $350 million Mammoth Solar project in West Virginia demonstrates this by pairing solar energy with zinc batteries capable of storing electricity for 10 hours, effectively overcoming the limitations of lithium-ion batteries’ shorter storage duration.

The sustainability edge of zinc batteries lies in their reliance on Earth-abundant materials like zinc and bromine, which foster a more resilient supply chain and reduce fire risks compared to lithium-ion systems. As Campbell Howe from Google highlights, this chemistry not only supports environmental goals but also enhances supply security, making zinc batteries a strategic choice for scaling long-duration, carbon-free energy storage.

The zinc battery projects also bring tangible economic benefits through job creation and local investment. For instance, the Lincoln facility alone is expected to generate approximately 100 construction jobs and bolster the local tax base, illustrating how these clean energy initiatives can simultaneously drive workforce development and community revitalization.