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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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Advanced lithium ion batteries, sodium sulfur (NaS) batteries, and compressed air energy storage (CAES) are other key technologies that will be utilized for bulk storage applications during the forecast period. 2010 vs 2011 forecasts. Thus, the ancillary services forecasts are based on a value of power ($/kW).