China has activated the world's largest zinc-air grid battery system — a 500-megawatt, 3,000-megawatt-hour installation in Hubei Province using zinc metal as the energy storage medium and ambient air as the oxidant, requiring no lithium, no cobalt, no vanadium, and no rare earth materials of any kind.
Zinc-air batteries generate electricity through an electrochemical reaction between zinc and oxygen from the air, scaled to grid level through a mechanically rechargeable design where zinc pellets are electrolytically replated from dissolved zinc oxide during charging. Each module achieves 85 percent round-trip efficiency and 20,000 charge cycles — three times the cycle life of lithium-ion batteries at a quarter of the raw material cost per kilowatt-hour.
Zinc is the fourth most abundant industrial metal on Earth, extracted from over 60 countries without geopolitical supply concentration. The Hubei installation powers 800,000 homes for 6 hours from a single charge and can sustain discharge for up to 12 hours continuously. China has approved eight additional zinc-air installations totalling 24,000 megawatt-hours across seven provinces.
Source: CNTIC VPower Energy Storage China, China Southern Power Grid, Chinese National Energy Administration, 2025
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