Energy storage startup
Appears in 1 story
Developing first full-scale mine-shaft gravity battery in Finland
The world has roughly 500,000 abandoned mine shafts. A small group of engineering startups believes these holes in the ground could solve renewable energy's biggest problem: what happens when the sun sets and the wind dies. The concept is deceptively simple—use surplus electricity to winch a massive weight to the top of a deep shaft, then let gravity pull it back down through generators when power is needed.
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