Corona: RKI-Fallzahlen & Inzidenz sinken weiter ++ 1117 Neuinfektionen in Deutschland
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Panik City Hamburg, Übernachten im Baumhaus, Zona Cafetera | SO | 16 05 2021 | 10:05
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Insolvenz in Eigenverwaltung: Neue Heimat für Autohaus Schmidt
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Gravity-based batteries try to beat their chemical cousins with winches, weights, and mine shafts
Apr. 22, 2021 , 2:35 PM
EDINBURGH, U.K. Alongside the chilly, steel-gray water of the docks here stands what looks like a naked, four-story elevator shaft except in place of the elevator is a green, 50-ton iron weight, suspended by steel cables. Little by little, electric motors hoist the weight halfway up the shaft; it is now a giant, gravity-powered battery, storing potential energy that can be released when needed. And that moment is now: With a metallic moan, the weight inches back down the shaft. Reversing direction, the motors become electric generators, sending up to 250 kilowatts of power back to the grid. For peak power, the weight can descend in 11 seconds but for testing purposes, it moves just a few meters at “creep speed,” says Douglas Hitchcock, project engineer at Scottish startup Gravitricity.