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Sprintcyclist
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is far ahead of the rest of the world
China invented a gravity battery the size of a skyscraper and it stores enough energy to power a city district for an entire night. The Energy Vault system deployed in Rudong County, Jiangsu Province in 2023 uses a deceptively simple principle: when electricity is cheap and abundant, use it to lift heavy weights. When electricity is expensive and scarce, let the weights fall and recover the energy through generators. Gravity never takes a day off. It never degrades over charge cycles. It requires no exotic materials, no lithium, no cobalt, and no temperature management. It is physics, scaled into a 100-metre tower filled with custom composite blocks weighing 35 tonnes each. The Rudong installation stores 100 megawatt-hours enough to power approximately 100,000 Chinese urban households for one hour, or 10,000 households for ten hours. The round-trip efficiency is approximately 80-85%, comparable to lithium-ion batteries but with a projected operational life of 35 years and no capacity degradation over time. A lithium battery that stores 100 megawatt-hours today will store 70 to 80 megawatt-hours in fifteen years. The gravity tower will store exactly the same in fifteen years as it does today, because physics does not wear out. China has approved five additional Energy Vault installations across Jiangsu and Guangdong provinces, with a combined storage capacity of 1,500 megawatt-hours. The technology attracts investment because its cost structure is the inverse of batteries: high upfront capital but near-zero ongoing costs, with an operational lifetime that amortises that capital over decades rather than years. In a country building renewable energy at the scale China is building it, storage that lasts 35 years without degradation is worth paying more for upfront.
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