The combination of renewable energy sources into the power system network has been growing rapidly in recent decades. As a consequence, there have been thoughtful concerns over the consistent and acceptable working of the electrical power systems. One of the elucidations being recommended to expand the dependability and functioning of this power system network is to join together with energy storage devices. The battery storage device may possibly be used for increasing the profit margin of solar or wind farm proprietors. This chapter discusses the present state of battery energy storage technology and its economic viability which impacts the power system network. Further, a discussion on the integration of the battery storage technology to the grid-tied photovoltaic (PV) is made.