A 22.5 MW Battery Energy Storage System was implemented to help balance power grid frequency in November 2014. Ulteig provided engineering services to accommodate the new BESS, which was located at a large wind energy center, including an additional 34.5kV position added to an existing 34.5/138 kV collector substation. The added position was made via a 1200A, 34.5kV breaker with metering class CTs and corresponding bus and line switches. The BESS branches were connected with medium voltage underground cable. Ulteig also provided project services supporting integration of controls and protections schemes, as well as an ION meter included for frequency monitoring.