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Continue to ChatGermany to use pumped hydro in coal mines to store wind energy https://polizeros.com/2011/06/25/germany-to-use-pumped-hydro-in-coal-mines-to-store-wind-energy/
Germany to use pumped hydro in coal mines to store wind energy https://polizeros.com/2011/06/25/germany-to-use-pumped-hydro-in-coal-mines-to-store-wind-energy/