SMRTR Science & EngineeringSep 14, 2026Interesting Engineering

World’s largest underground ‘super power bank’ starts up with 700 MW capacity

SMRTR summary

China has activated the world's largest underground compressed air energy storage facility in Jiangsu Province, with a total capacity of 700 MW. The plant stores surplus electricity by compressing air into deep salt caverns, then releases it to power turbines during peak demand, with efficiency exceeding 70%.

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