Reliable source of energy is a topic of momentous concern in the world due to the uncertainty in conventional energy sources. The situation gets exacerbated with the impact of natural disasters on the transmission grid. The advent of cutting edge energy storage technology has provided a competent solution. Energy storage system is an integral part of a grid since it enhances the stability and performance by disengaging the energy generation source and the load especially when intermittent renewable energy sources are a part of the system. Battery technology should not only be able to demonstrate high performance but must be economically viable for project implementation. Several grid connected renewable energy based battery projects have been implemented for research and development as well as commercial application. The projects discussed in this review are considered based on the availability of information. This review paper will focus on grid connected battery projects powered by wind and solar energy generation sources.