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by Sorgam
4225 days ago
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It's capital cost for providing 1kWh of storage for an imaginary 1 hour. I don't think that makes much sense, since you wouldn't be able to scale down the capital costs in proportion to the storage time. $103/kWh*6h = $618/kW which is on Isentropic's own site describing a turbine rather than pistons: "With a capital cost of only $618/kW for 6 hours of storage ($375/kW power machinery and $40/kWh stored energy) and a round-trip efficiency in excess of 90% this is the cheapest and most efficient form of energy storage." http://www.isentropic.co.uk/Energy-Storage-Systems |
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