---
title: "Iron-sodium grid batteries just took a big step toward US rollout"
description: "Inlyte Energy has successfully completed a factory acceptance test for its first field-ready iron-sodium battery energy storage system, marking a significant milestone from lab to grid reality. The te"
type: "news"
locale: "en"
url: "https://longbridge.com/en/news/269433592.md"
published_at: "2025-12-11T21:38:59.000Z"
---

# Iron-sodium grid batteries just took a big step toward US rollout

> Inlyte Energy has successfully completed a factory acceptance test for its first field-ready iron-sodium battery energy storage system, marking a significant milestone from lab to grid reality. The test, attended by representatives from Southern Company, demonstrated the system's performance and integration readiness. Iron-sodium batteries are emerging as a viable alternative to lithium-ion for grid-scale applications, offering benefits like cost-effectiveness, safety, and long-duration performance.

Iron-sodium battery makersInlyte Energy just crossed an important line from lab to grid reality. The company has completed a factory acceptance test of its first field-ready iron-sodium battery energy storage system with reps from a major US utility in attendance.

## Iron-sodium battery storage

The test took place at Inlyte’s facility near Derby in the UK, and was witnessed by representatives from Southern Company, one of the largest electric utilities in the US. The goal was to prove the performance and integration readiness of the whole system, which combines sodium metal chloride battery cells with inverters and control electronics. By Inlyte’s account, the system performed as expected and is ready for field deployment.

The energy storage market is growing fast, and utilities are looking beyond lithium‑ion. Iron-sodium battery storage systems are emerging as a compelling alternative to lithium-ion batteries for grid-scale use, as they rely on abundant, low-cost materials and offer strong safety and long-duration performance.

While lithium-ion batteries excel at fast response and short-to-medium-duration storage, iron-sodium systems are better suited for multi-hour to multi-day grid applications where cost, thermal stability, and long service life matter more than energy density.

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> **Disclaimer**: This article is for reference only and does not constitute any investment advice.