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California ISO officials brief Utah regulators on WEIM benefits and EDAM go‑live plan
Summary
California ISO officials told the Utah Public Service Commission that the Western Energy Imbalance Market has produced multibillion‑dollar benefits and that the ISO is on track to bring an Extended Day‑Ahead Market into operation in May 2026.
California ISO officials told the Utah Public Service Commission on the record that the Western Energy Imbalance Market (WEIM) has produced multibillion‑dollar economic benefits and that the ISO is on track to launch its Extended Day‑Ahead Market (EDAM) with Pacific‑core participants in May 2026.
“We facilitate market trades, but we do not act as a market participant,” said Anna McKenna, vice president of market design analysis for the California ISO, describing the ISO’s role as neutral operator of the grid and markets.
The briefing covered three operational items that the ISO said drive WEIM benefits: a large, geographically diverse pool of resources that reduces production costs; real‑time optimization every 15 and 5 minutes that helps manage changing weather and renewables; and procedures that test participant readiness so the market produces feasible dispatches. Anna McKenna said WEIM has produced more than $7 billion in estimated…
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