Tesla’s Megapack has been a dominant player in stationary energy storage, but a new long-duration system is emerging to challenge its market position.

As a backbone of the renewable energy transition, lithium-ion batteries power EVs and utility-scale storage for grid balancing and emergency backup. While they typically last around four hours, grid planners emphasize the need for diurnal storage systems exceeding 10 hours in the future.

 US startup Inlyte has introduced an iron-sodium battery designed for both mid-range (4–10 hours) and long-duration (24+ hours) energy storage. The company recently announced an accelerated manufacturing timeline through a new Memorandum of Understanding with Swiss battery manufacturer HORIEN Salt Battery Solutions, Clean Technica reported.

According to Inlyte, partnering with HORIEN provides access to advanced manufacturing expertise and industry connections, accelerating the deployment of its cost-effective, long-duration battery technology. After proving its technology at a UK pilot plant, Inlyte is preparing to launch “Inlyte Factory 1” in the US, replicating HORIEN’s battery manufacturing system while integrating its iron-sodium technology.

Furthermore, the company highlighted that its energy storage technology not only sustained capacity for over 700 cycles but also demonstrated impressive 90% roundtrip efficiency, marking a significant milestone in its development.

Inlyte also reported that its testing results, spanning over a year, project a battery life of at least 7,000 cycles or 20 years. This performance matches that of traditional sodium nickel chloride batteries, but at a fraction of the cost.

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