CPUC Staff Questions CAISO’s EDAM Load Adjustments
California Public Utilities Commission (CPUC) staff has raised concerns about the California Independent System Operator's (CAISO) calculations in its Extended Day-Ahead Market (EDAM), citing unclear methodology and data discrepancies. In comments filed on August 12, CPUC questioned a specific load adjustment of 592.50 MW made by CAISO on June 11 as well as an even larger adjustment of 3,590 MW on August 4. The Six Cities — Anaheim, Azusa, Banning, Colton, Pasadena, and Riverside — also expressed concerns about the high resource commitments required for EDAM compared to its limited benefits in early operations. They noted that CAISO's Balancing Authority Area (BAA) transferred nearly half of its gross benefits ($2.67 million out of $5.96 million) as congestion revenues to PacifiCorp, raising questions about cost allocation. CAISO launched EDAM in May 2026 as the first day-ahead market for California and parts of the West. While it has seen limited participation so far — with only PacifiCorp involved initially — Portland General Electric is set to join on October 1.
Tickers: $POR
Topics: CAISO CPUC EDAM energy markets grid management