ESS and Juniper Energy Partner on 500+ MWh Sodium-Ion Energy Storage Initiative
ESS Tech, Inc. (NYSE: GWH), a leading developer of non-lithium battery energy storage technologies, has announced a significant step forward in the commercialization of sodium-ion battery storage by signing a Letter of Intent (LOI) with renewable energy developer Juniper Energy LLC. The agreement outlines plans to deploy more than 500 megawatt-hours (MWh) of sodium-ion battery energy storage systems over the coming years, marking one of the largest planned deployments of this emerging technology in the United States.
The partnership represents a major milestone for ESS as the company continues to expand its portfolio beyond traditional energy storage technologies. By focusing on sodium-ion batteries, ESS aims to provide utilities, commercial customers, and infrastructure developers with a safer, domestically sourced alternative to lithium-ion batteries. The collaboration also reflects the increasing interest in battery technologies that reduce dependence on critical minerals while supporting the growing demand for grid reliability and renewable energy integration.
Long-Term Strategic Partnership
The Letter of Intent establishes the foundation for a long-term collaboration between ESS and Juniper Energy. Rather than focusing on a single installation, the agreement creates a framework for deploying sodium-ion battery energy storage systems across multiple renewable energy projects over several years.
The companies plan to begin their collaboration with a 10-megawatt (MW) / 80-megawatt-hour (MWh) battery energy storage project in California. The project is expected to utilize ESS’s recently introduced Bridge™ modular sodium-ion AC energy storage platform alongside the company’s Energy Management System (EMS).
Commercial operations for the initial installation are currently targeted for 2027, assuming successful project development, permitting, and construction activities.
The California project is intended to serve as the first commercial validation of the Bridge platform while demonstrating the performance of sodium-ion battery technology under real-world operating conditions.
A Growing Market for Alternative Battery Technologies
Energy storage demand has increased rapidly worldwide as utilities continue adding renewable generation to electric grids. Solar and wind energy require flexible storage systems capable of shifting electricity production to periods of higher demand while improving grid stability.
Lithium-ion batteries currently dominate the utility-scale energy storage market. However, growing concerns surrounding raw material availability, supply chain concentration, mineral pricing, and long-term sustainability have encouraged developers and technology companies to explore alternative battery chemistries.
Sodium-ion technology has emerged as one of the most promising alternatives because sodium is among the most abundant elements on Earth. Unlike lithium, cobalt, and nickel, sodium can be sourced from widely available materials, reducing dependence on geographically concentrated mineral supplies.
This abundance has the potential to lower supply chain risks while improving manufacturing flexibility and supporting domestic battery production.
ESS’s Bridge Platform
The California demonstration project will feature ESS’s Bridge™ modular sodium-ion battery energy storage system, introduced as part of the company’s broader expansion into sodium-based energy storage technologies.
The Bridge platform is designed as a modular AC energy storage solution suitable for utility-scale projects, commercial facilities, data centers, and other high-demand applications.
The modular architecture enables developers to scale installations according to project requirements while simplifying deployment and integration into existing electrical infrastructure.
The system will also incorporate ESS’s proprietary Energy Management System (EMS), which is responsible for monitoring battery performance, optimizing charging and discharging cycles, managing grid interactions, and maximizing operational efficiency.
Together, these technologies are intended to provide reliable long-duration energy storage while supporting renewable energy integration and grid modernization.
CEO Highlights Market Validation
ESS Chief Executive Officer Drew Buckley described the agreement as an important validation of the company’s long-term strategy to commercialize sodium-ion battery technology.
According to Buckley, the partnership demonstrates growing customer confidence in alternative battery chemistries that can provide enhanced safety, improved domestic sourcing, and reduced dependence on traditional lithium-ion supply chains.
He noted that the agreement reflects increasing demand for energy storage technologies capable of supporting utility-scale projects while addressing concerns surrounding raw material availability and geopolitical risks.
Buckley emphasized that ESS continues expanding its technology portfolio to meet evolving customer requirements across multiple market segments.
Juniper Energy’s Perspective
Juniper Energy views the partnership as an opportunity to evaluate and deploy next-generation battery technologies capable of supporting the renewable energy transition.
Managing Partner Keith McDaniels said the company seeks partnerships with technology providers that can successfully move innovative products from development into commercial deployment.
According to McDaniels, ESS has demonstrated capabilities in integrating, deploying, and scaling advanced energy storage systems, giving Juniper confidence in the company’s ability to execute commercial sodium-ion battery projects.
The initial California project will provide an opportunity to validate the Bridge energy storage platform under commercial operating conditions before expanding deployments across additional renewable energy developments.
Juniper expects the experience gained through the first installation to support broader adoption of sodium-ion battery systems across future projects.
Potential for 500 MWh by 2032
While the current agreement is structured as a Letter of Intent rather than a binding purchase contract, it establishes an ambitious long-term deployment roadmap.
Subject to successful execution of the initial project and continued development of future renewable energy facilities, Juniper Energy has expressed its intention to procure 500 MWh or more of ESS battery energy storage systems by 2032.
Reaching this deployment level would represent a significant commercial achievement for ESS and would contribute to broader market acceptance of sodium-ion battery technology.
The phased approach allows both companies to evaluate technical performance, operational reliability, and project economics before expanding deployments over the remainder of the decade.
Addressing Supply Chain Challenges
One of the primary advantages promoted by ESS is the domestic sourcing potential of sodium-ion battery technology.
Global lithium-ion battery production remains heavily dependent on international supply chains for lithium, cobalt, nickel, and graphite. Many of these materials originate from a relatively small number of countries, creating potential geopolitical and logistical risks.
In contrast, sodium is widely available and can be sourced from abundant domestic resources.
By utilizing sodium-based chemistry, ESS aims to reduce exposure to supply disruptions while supporting domestic manufacturing and energy infrastructure development.
The technology also aligns with broader efforts to strengthen North American battery supply chains and reduce reliance on foreign critical mineral sources.
Supporting Grid Modernization
Battery energy storage systems are becoming increasingly important as electric grids transition toward higher levels of renewable energy generation.
Storage enables utilities to capture excess electricity generated during periods of high solar or wind production and deliver that energy when renewable output declines or electricity demand increases.
Beyond renewable integration, battery systems also provide services including frequency regulation, peak demand management, reserve capacity, voltage support, and grid resilience.
ESS believes sodium-ion technology can play an important role across these applications while offering customers additional flexibility in battery selection.
Expanding Commercial Opportunities
In addition to utility-scale renewable energy projects, ESS sees growing opportunities across several emerging market segments.
Artificial intelligence data centers are creating substantial new electricity demand while requiring highly reliable backup and load management systems.
Commercial and industrial facilities are increasingly investing in battery storage to reduce electricity costs, improve resilience, and participate in energy markets.
Critical infrastructure operators—including hospitals, transportation facilities, government installations, and telecommunications networks—are also expanding battery storage investments to strengthen operational reliability.
ESS believes sodium-ion batteries can address these diverse applications by combining safety, scalability, and abundant material availability.
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