Large-scale energy storage is one method that can be used to match the variable production of wind energy with the actual demand. In such a system, energy can be stored when the energy production is higher than demand. Royal Haskoning designed an underground pumped-storage hydropower station which will have an electric storage capacity of 8 GWh. The electrical power output will be 1,400MW and will be generated by seven pump/hydropower units, each with a capacity of 200MW. On page 7 you will find the whole article.

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