Increasing the penetration of Wind Power Plants (WPP) into the electric system brings about problems related to wind’s inherent variability. Energy Storage Systems (ESS) are explored as a potential solution for addressing these problems, by providing WPPs with increased versatility and reliability without reduced production. The current needs of WPPs for participating in the electric grid are evaluated, and possible services that ESSs could provide are selected, as well as evaluated for their potential profitability. The ability of battery energy storage (BES) to provide these services is verified by using a Real-Time Digital Simulator (RTDS). Finally, real wind production and market data is analyzed and used to estimate benefits from providing services for the WPP, calculations which include the cost and lifetime of the BES.