California Independent System Operator

The California Independent System Operator (CAISO) is a nonprofit public benefit corporation that manages the high-voltage electricity grid for 80 percent of California and a portion of Nevada ^[1], . Regulated by the Federal Energy Regulatory Commission (FERC), CAISO ensures the reliability of approximately 26,000 miles of transmission lines and operates a competitive wholesale energy market ^[4], . The entity acts like a traffic controller for the grid, matching electricity buyers and sellers through over 28,000 daily transactions without owning any generation or transmission assets itself ^[4], . CAISO is governed by a five-member Board of Governors appointed by the Governor of California and confirmed by the State Senate ^[11], . Its headquarters are located in Folsom, California, and it serves more than 30 million residents ^[5], .

Historical Background

The California Legislature created CAISO in 1996 through Assembly Bill 1890 to restructure and deregulate the state's electricity industry ^[2], . It officially began operations in March 1998, separating the transmission system operator from the power exchange to foster competition ^[2], . Following the 2000–2001 California energy crisis, the state's power exchange went bankrupt, and CAISO eventually implemented a nodal market in 2009 to improve price transparency ^[2], . In 2014, CAISO launched the Western Energy Imbalance Market (WEIM) to allow real-time energy trading across 11 Western states ^[11]. The entity has faced past penalties, including a $6 million settlement for standards violations related to the 2011 Southwest blackout ^[3]. Recent expansions include the 2015 Senate Bill 350, which encouraged the transformation of CAISO into a broader regional organization ^[8].

Current Events

As of March 2026, CAISO is advancing its 2026–2027 Transmission Planning Process, with the Interregional Transmission Project submission window closing on March 31, 2026 ^[10], . In February 2026, CAISO reported a strategic shift toward reliability-driven transmission projects, earmarking $1.3 billion less for development than the previous year to focus on grid stability ^[9]. A major milestone for 2026 is the scheduled launch of the Extended Day-Ahead Market (EDAM), which aims to optimize grid use across the West with participation from PacifiCorp and Portland General Electric ^[9], . On February 12, 2026, the organization held a stakeholder call to discuss a new finance initiative involving a revenue requirement cap increase and startup funding for the Regional Organization for Western Energy (ROWE) ^[18], . The Board of Governors is expected to review the final 2026–2027 Transmission Plan in May 2026 ^[6], .