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According to a new study from McKinsey & Company, titled,  
. . . ‘Battery storage: The next disruptive technology in the power sector’.

The study explores,
. . . the rapid rise of battery storage systems, and
. . . their potential impact on:
. . . . . . consumers’ behavior,  
. . . . . . various grid operators, and
. . . . . . generation operators.

Battery storage costs per kilowatt-hour:
. . . . . . 2010 = $1,000,
. . . . . . 2016 =   $230.
For customers, it is particularly useful for
. . . . . . storage, and
. . . . . . self-consumption,
For utilities operators,
. . . . . . frequency regulation,
. . . . . . renewable-energy-technology firming, and smoothing.
. . . Additional benefits may arise for utilities, including:
. . . . . . creating local capacity,
. . . . . . distributed and transmission investment deferral,
. . . . . . largely to offset risks from technology changes.
–  
7-18-2017 Source:  #Batteries to drive down energy prices