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Horizon

Introduction

Long-duration storage for tomorrow’s green energy baseload

Horizon™ is ESS’s iron flow battery energy storage system designed primarily for utilities, independent power producers, microgrid operations and other critical infrastructure requiring long duration energy storage. Delivering up to 16 to 48+ hours of energy storage in a customizable design, Horizon enables increasingly high levels of renewable energy penetration on the grid.

Why Choose Horizon?

Purpose built for renewable energy integration.

As more renewable energy is deployed on the grid, balancing intermittent power sources like solar and wind over extended durations becomes increasingly important. Horizon is engineered to provide the safest solution possible utilizing a non-flammable electrolyte to provide more than 16 hours of energy discharge for extended duration requirements.

Iron Flow Technology.

Earth-abundant materials iron and salt simplify supply chains and reduce geopolitical risks.

Extended-Duration Energy Storage.

Capable of long duration energy applications exceeding 16-hours

Flexible Modular Grid Solutions.

Modular architecture allows for customizable solutions to meet local grid requirements.

Simplified Temperature Management.

No complex temperature control systems

Long-Term Maintenance Simplicity.

20-year design life eliminates augmentation risk and makes maintenance simpler

Safer by design.

Horizon utilizes a non-flammable, water-based electrolyte and earth-abundant materials, eliminating the risk of thermal runaway associated with other battery chemistries.

The system is designed for decades of operation with minimal degradation, allowing customers to cycle the battery daily without sacrificing performance or lifespan. The result is a safer, durable, and reduced-maintenance energy storage platform ideally suited for large-scale applications.

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Built for What's Next

Built to power critical infrastructure.

As energy demand grows and infrastructure evolves, battery storage must do more than simply store electricity. Bridge is engineered to improve safety, simplify deployment, and provide the flexibility needed for today’s highest-growth applications.

As our energy supply increasingly relies on intermittent, renewable energy, battery storage must incorporate long duration energy storage to most effectively balance load and demand. Horizon provides the resilience tomorrow’s grid demands.

Built for Long-Duration Energy Storage

Horizon combines advanced iron flow battery technology with ESS’s expertise in system integration, battery management, and energy management software. Designed for long-duration applications ranging from 16 to 48+ hours, Horizon provides flexible, scalable energy storage for utilities, renewable energy projects, microgrids, and critical infrastructure.

Its modular architecture enables customers to economically scale energy capacity to meet evolving requirements while supporting reliable renewable energy integration, energy shifting, and grid resilience.

Built for Energy Security and Supply Chain Resilience

Horizon is designed to reduce exposure to global supply chain uncertainty through the use of abundant materials including iron, salt, and water. Unlike conventional battery technologies that depend on constrained critical minerals, iron flow batteries leverage widely available resources that support a more resilient and sustainable supply chain.

ESS’s approach helps customers address Foreign Entities of Concern (FEOC) requirements, strengthen domestic energy infrastructure, and support long-term energy security through reliable, domestically sourced energy storage solutions.

Why Iron Flow?

Reliable Long-Duration Storage for Resilient Grids

Iron flow batteries are purpose-built for long-duration energy storage, delivering reliable power for 16 hours or more with minimal performance degradation over decades of operation. Their unique architecture allows energy capacity and power output to be scaled independently, making them well suited for renewable energy integration, grid reliability, microgrids, and energy security applications. Built from non-toxic, abundant materials and designed for daily cycling over a long operational life, iron flow batteries provide utilities and infrastructure owners with a sustainable platform for building a more resilient electric grid.

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Ready to Build What's Next?

Whether you’re balancing solar and wind power on the grid, providing long duration energy shifting, or enabling greater grid-scale resiliency, Horizon delivers the durability, safety, and lifespan needed to meet tomorrow’s energy demands.

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