Karetic Energy is building iron-air batteries to store power for days rather than hours
The company is developing long-duration storage using iron and air, aimed at the multi-day gaps that solar and wind leave and that lithium cannot economically fill.
Karetic Energy, a Bengaluru-based startup founded in 2022, is developing iron-air batteries to provide long-duration grid storage for renewable energy. Founded by Dr Suryanarayana Vikrant Karra and Prabhakar Kumar, the company aims to address the limitations of short-duration storage solutions for solar and wind power. Unlike traditional lithium-ion batteries, Karetic's iron-air batteries use abundant and inexpensive materials, such as iron, air, and water, to enable long-lasting power storage.
The startup's technology is rare-earth-free and non-flammable, which reduces supply chain risks and enhances safety for large-scale installations. Karetic claims its iron-particulate bed architecture effectively suppresses hydrogen evolution and surface passivation, allowing for continuous discharge cycles of up to 145 hours. This multi-day flexibility could bridge the gap between renewable energy generation and grid demand, enabling applications such as utility-scale storage, industrial microgrids, and renewable farms.
The company's modular, pilot-ready systems are positioned for utility trials, with laboratory performance figures demonstrating the potential of their iron-air battery platform.
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