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" ... Answering this question and determining the economics of the potential project often requires building a sophisticated business case, since storage is itself dynamic: it’s all about when – and how much it costs - to charge the asset compared with how deep and how long you discharge that asset, and the resulting value created. Do you want capacity (quick release of many kilowatts) or energy (kilowatts over a longer duration, in the form of kilowatthours) or some combination of both? The answer may in fact be all of the above, and that value proposition may change as new resources (renewables or otherwise) are added to the grid. This flexibility and how it adds to resilience is the heart of energy storage. ... "