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An indigenous iron-air battery system has entered utility-scale pilot evaluation at NTPC's Simhadri thermal power station in Andhra Pradesh.
The project involves Chennai-based deep-tech startup Meine Electric and the Atal Incubation Centre at Anna University, and targets long-duration energy storage.
The company's Fast Charge Long Discharge system uses a six-hour charging cycle and an 18-hour discharging cycle.
The pilot will test technical performance and operational reliability under real utility conditions before any larger deployment.
An iron-air battery stores electricity through a controlled, reversible version of rusting. On discharge, iron reacts with oxygen drawn from the air in the presence of water, releasing energy; on charge, the reaction is driven backwards and the iron is restored. The materials - iron, air and water - are cheap and abundant, unlike the lithium, cobalt and nickel that dominate today's batteries. The trade-off is speed and density: iron-air systems are heavy and slow, which rules them out for vehicles but suits a stationary grid installation that must deliver power steadily for many hours.
Simple Analogy: A lithium battery is a sprinter; an iron-air battery is a load-bearing draught animal - slower, cheaper to keep, and able to pull all day.
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Storage able to discharge electricity for many hours, typically beyond the four-hour range of conventional grid batteries.
How much of its original storage capacity a battery keeps after repeated charge-discharge cycles.
The ability of a power system to balance supply and demand as variable renewable generation rises and falls.