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Many modern cities aspire renewable energy self-sufficiency. On a basic level, this can be achieved by producing enough solar and wind power to cover annual electricity demand. On a more ambitious level, the renewable power supply should cover consumption during every hour of the year. This could be reached by storing the energy in a local storage system with sufficient capacity. The Hydraulic Hydro Storage System is a solution to this ambitious level of self-sufficiency. It relies primarily on local resources and has an efficiency of 80%.doi:10.1016/j.egypro.2014.01.162 fatcat:azieldslcjcjro4aujwetwdqam