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IIT Hyderabad-incubated startup Crimson Energy has launched India's first indigenously developed Iron-Chromium (FeCr) flow battery, designed for long-duration energy storage. The technology aims to strengthen renewable energy integration, enhance grid reliability, and reduce dependence on imported battery technologies through a scalable, domestically developed solution.

IIT Hyderabad-incubated startup Crimson Energy has unveiled India's first indigenously developed Iron-Chromium (FeCr) flow battery, marking a significant milestone in the country's energy storage ecosystem. The launch represents an important step towards building domestic capabilities in long-duration energy storage, supporting India's clean energy transition and reducing reliance on imported battery technologies. The innovation has been developed through years of research and engineering at IIT Hyderabad and is aimed at addressing the growing need for reliable grid-scale energy storage.

Unlike conventional lithium-ion batteries, the Iron-Chromium flow battery stores energy in liquid electrolytes contained in external tanks, enabling independent scaling of power and energy capacity. This architecture makes the technology particularly suitable for long-duration storage applications, where electricity generated from renewable sources such as solar and wind can be stored and discharged over extended periods. The battery is also designed to offer enhanced operational safety, longer service life, and lower degradation compared to traditional battery chemistries.

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Crimson Energy stated that the battery has been developed using domestically engineered technology, supporting India's objective of strengthening indigenous manufacturing under the Atmanirbhar Bharat initiative. By using iron and chromium, materials that are relatively abundant and more affordable than several critical minerals used in lithium-ion batteries, the solution is expected to improve supply chain resilience while reducing dependence on imported raw materials.

The technology is intended for a wide range of applications, including renewable energy integration, utility-scale grid balancing, industrial backup power, microgrids, and commercial energy storage systems. As renewable energy capacity continues to expand across India, long-duration storage solutions are expected to play a critical role in ensuring stable electricity supply during periods of low solar or wind generation. The new battery platform is designed to help utilities and industries improve energy reliability while supporting the wider adoption of renewable power.

The startup plans to commercialise the technology through partnerships with utilities, renewable energy developers, and industrial customers. The launch also highlights the growing contribution of IIT Hyderabad -incubated startups in translating academic research into commercially viable technologies that address national priorities in clean energy and advanced manufacturing.

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The introduction of India's first indigenous Iron-Chromium flow battery strengthens the country's efforts to build a self-reliant energy storage ecosystem. By combining domestic innovation with scalable long-duration storage capabilities, the technology is expected to support renewable energy deployment, enhance grid resilience, and contribute to India's long-term clean energy and sustainability goals.