In view of the projected global energy demand and increasing levels of greenhouse gases and pollutants, there is a well-established need for new energy technologies which provide clean and environmentally friendly solutions to meet end user requirements. Present review work is an effort to study the electrical power generation because of the need to reduce greenhouse gas emissions and to introduce mixed energy sources. Review based on the present and future Electrical Energy Storage (EES) system which is recognized as underpinning technologies to have great potential in meeting these challenges, whereby energy is stored in a certain state, according to the technology used, and is converted to electrical energy when needed. Review work starts with an overview of the operation principles, technical and economic performance features and the current research and development of important EES technologies, categories based on the types of energy stored. Work intends to mitigate this problem by providing a comprehensive and clear picture of the state-of- the-art technologies available, and where they would be suited for integration into a power generation and distribution system. Moreover, comparison had been made between RES and EES system.