High performance energy storage system using carbon-dioxide

Disclosed is a system suitable for both of the production of electricity, and the utilization of electricity, comprising: electricity transformator, rectifyer, an oxygen storage and drawer unit, a hydrogen gas transmission unit, a reactor for the production of methanol, to which a carbon dioxide container and a carbon dioxide compression and pre-heating unit is linked at the input side, and a methanol-water rectifying unit is linked at the output side, the water leaving said rectifying unit is transferred to the fresh water inlet, and the separated methanol is transferred to the methanol storage tank, which is optionally linked to an equipment suitable for the combustion of methanol, preferably gas turbine. A process for storing electricity using the system is also disclosed.