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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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salad
We figured it out decades ago, opened in 1984:
https://youtu.be/McByJeX2evM
Two lakes with a 535M elevation difference. 9.1GWh of storage, max output 1.7GW, so about 5 hours at full chat.