The Western Energy Imbalance Market (WEIM), a real-time energy market operated by the California Independent System Operator (CAISO), has gained three new participants, including its first generation-only entity.
CAISO on April 5 announced the Western Area Power Administration (WAPA) Desert Southwest region, El Paso Electric (EPE), and AVANGRID have formally begun participation in the WEIM. WEIM’s 22 active participants, which now span 11 Western states, represent “nearly 80% of the demand for electricity in the Western interconnection,” CAISO said.
