This initiative will develop an approach to extend participation in the day-ahead market to the Western Energy Imbalance Market (WEIM) entities in a framework similar to the existing WEIM approach for the real-time market, rather than requiring full integration into the California ISO balancing area. The extended day-ahead market (EDAM) will improve market efficiency by integrating renewable resources using day-ahead unit commitment and scheduling across a larger area.
| Proposal Development | Decision | Implementation | Completed/Closed |
|---|---|---|---|
|
Jun 24, 2025 Final tariff language posted
Jun 11, 2025 Draft tariff language posted Jun 06, 2025 Congestion Revenue Allocation final proposal posted Mid-April 2024 EDAM access charge FERC filing Jul 25, 2023 Revised draft tariff language posted Dec 07, 2022 Final proposal posted |
Aug 29, 2025 EDAM - Congestion Revenue Allocation FERC approval (ER25-2637)
Jun 19, 2025 EDAM - Congestion Revenue Allocation: ISO Board and WEM Governing Body approval Jun 11, 2024 EDAM Access Charge FERC approval (ER24-1746) Dec 20, 2023 FERC approval (ER23-2686) Aug 22, 2023 Tariff amendment (ER23-2686) Feb 01, 2023 ISO Board of Governors and WEIM Governing Body joint approval |
Nov 13, 2025 Comments for Q&A due
Implementation milestones
Nov 14, 2025 EDAM Implementation - Q&A Workshop Dec 5, 2025 comments due Feb 27, 2025 comments due for FAQ document May 01, 2026 Activation |