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Federal Energy Regulatory Commission

Electric Power Markets: California (CAISO)

California (CAISO) Electric Regions  
California (CAISO) Electric Regions   
Click the item below for a downloadable PDF
CAISO At A Glance CAISO Energy Imbalance Market CAISO Renewable Integration: Duck Chart CAISO Resource Areas Balancing Authorities

The California Independent System Operator (CAISO) operates a competitive wholesale electricity market and manages the reliability of its transmission grid. CAISO provides open access to the transmission and performs long-term planning. In managing the grid, CAISO centrally dispatches generation and coordinates the movement of wholesale electricity in California and a portion of Nevada. CAISOs markets include energy (day-ahead and real-time), ancillary services, and congestion revenue rights. CAISO also operates an Energy Imbalance Market (EIM), which currently includes PacifiCorpís two balancing authority areas.

CAISO was founded in 1998 and became a fully functioning ISO in 2008. The Energy Imbalance Market launched in 2014 with PacifiCorp as the first member or EIM Entity. With PacifiCorp, the EIM served parts of Oregon, Washington, California, Utah, Wyoming and Idaho.