**8. Conclusion**

With the generation of electricity using renewable energy resources, the dependence on fossil fuels can be reduced; but these are variable and intermittent nature of energy generation so for their flexibility, stability and reliability energy storage technologies are put into practice. Major problem associated for renewable energy resources is the inconsistent power output, that can easily be reduced and solved using battery energy storage technology, along with that it result in decarburization of energy mix and mitigation of CO2 emission, and global warming effects. Long life cycle, high charge and discharge efficiency, and high power density characteristics of electrochemical super capacitors technologies are the key features to use these technologies into aerospace, automobiles, and portable electronics. From super capacitor to battery and battery to super capacitor charge migration result in improvement I efficiency about 51.3%. As solar energy is available to us during day time about 6–8 hours in a day, hence to get the proper and maximum benefit of this solar energy solar based pumped hydro energy storage system PHES system is made BESS can easily be adopted in off grid as well as in on grid system, also at any location in the power system from generation to consumer. With the development in battery energy storage system, their cost and performance characteristics are being improved, that make an important role in their market value. By storing energy using battery storage technology near to the loads transmission and distribution losses reduced, hence system efficiency is increased.
