The California ISO’s Western Energy Imbalance Market (EIM) is a real-time bulk power trading market, the first of its kind in the western United States. The Western EIM’s advanced market systems automatically find the lowest-cost energy to serve real-time customer demand across a wide geographic area. Utilities will maintain control over their assets and remain responsible for balancing requirements while sharing in the cost benefits the market produces for participants. Since launching in 2014, the Western EIM has enhanced grid reliability and generated cost savings in the millions for its participants. Besides its economic advantages, the EIM improves the integration of renewable energy, which leads to a cleaner, greener grid.EIM is governed by a five member body with delegated authority over rules specific to the Western EIM.