NOVELTY - The device has an ion-permeable separator i.e. optional insulative separator (290), for separating positive and negative electrode current collectors. A positive electrode is arranged between the positive electrode current collector and the separator. A negative electrode is arranged between the negative electrode current collector and the separator. One of the positive and negative electrodes includes a non-stationary solid or semi-solid composition having supercapacitive particles i.e. carbon, and an electrolytic solvent, which is free of electrochemically oxidizable or reducible species.    USE - Energy storage device for use within a transportation system i.e. automobiles e.g. plug-in hybrids and all-electric vehicles, individual private dwellings/residences, and power generation and/or grid systems in wind turbine, water wave systems and solar farms.    ADVANTAGE - The device minimizes degradation, increases scalability, usage of relatively safe materials of construction, and provides adaptability to store small amounts of energy for use in private homes or transportation devices and large quantities of energy for energy storage for wind turbines and solar farms. The device provides ability to store energy in separate reservoirs to improve energy densities of supercapacitive systems.    DETAILED DESCRIPTION - The ion-permeable separator is made of polyolefin, a fluorinated polymer, a sulfonated polymer, an alkoxylate polymer, a ceramic, or copolymer or physical mixture or laminate. The electronic solvent is polar organic solvent and ionic liquid. The carbon is provided in the form of carbon black, carbide-derived carbon, or alliform carbon. INDEPENDENT CLAIMS are also included for the following:    (1) a method for operating an energy storage device    (2) a method for storing energy using an energy storage device    (3) a method for releasing stored energy using a device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a capacitive energy storage.    Reservoirs (210, 220)    Particle densities (230)    Cells (250, 260, 270)    Storage reservoirs (280)    Optional insulative separator (290)