NOVELTY - The system (2) has a storage battery (11) e.g. lithium ion polymer battery that supplies electrical power with respect to load (3). A shunt circuit (13) revives portion of electric power when electric power generation amount of solar-heat battery panel or photovoltaic solar cell panel is larger than predetermined electric energy. A converter (16) supplies direct-current for charging lithium ion battery with power transmitted from electric power supply system when electric power generation amount of battery panel is less than predetermined electric energy.    USE - Electrical storage system for use in industry, commercial establishment, residence and building, factory and research laboratory (all claimed).    ADVANTAGE - Since the direct-current power can be supplied for charging the lithium ion battery with electric power transmitted from electric power supply system when electric power generation amount of solar-heat battery panel is less than predetermined electric energy, the deterioration of the quality of the electric power supplied from the power station can be prevented while attaining the leveling of electric power using the storage battery. Since the portion of electric power is revived when electric power generation amount of solar-heat battery panel is larger than predetermined electric energy, the power generated using the natural energy can be used effectively. Since the one-way element is provided between the input terminal of regeneration unit and input-output end of electrical storage unit to suppress the overvoltage applied to battery or load by shunt circuit, the conversion loss in the converter can be improved and backflow of current to the storage system can be prevented.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) electrical storage method; and    (2) electrical storage program.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of the electrical storage apparatus. (Drawing includes non-English language text)    Electrical storage system (2)    Load (3)    Storage battery (11)    Shunt circuit (13)    Converter (16)