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Pike Research forecasts worldwide grid energy storage spending to reach $22B by 2021, down from 2010 forecast of $35B

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For the long-duration segment of the energy storage market, pumped hydro storage and advanced flow batteries will represent the largest portions of the total revenue opportunity during the next decade. Thus, the ancillary services forecasts are based on a value of power ($/kW). Energy storage on the grid is reaching a turning point.