Extended Day-Ahead Market (EDAM)
Building on the demonstrated economic, reliability, and environmental benefits of the Western Energy Imbalance Market (WEIM), the California ISO’s EDAM will optimize the use of existing transmission and resources in the much larger day-ahead timeframe across an expanded Western footprint.
EDAM will open the door to significantly improved economic benefits through the commitment of least-cost generation across the market’s broad geographic footprint and enable improved situational awareness across balancing authority areas, enhance reliability, and lower greenhouse gas emissions.
Resources
- Read the EDAM – Frequently Asked Questions.
- View the Extended Day-Ahead Market overview video.
- View the EDAM Participation Structure Overview training course.
- Read the EDAM fact sheet .
- View the Aug. 30, 2023 EDAM Forum recording.
- Read the news release about federal regulators accepting changes to the ISO’s tariff allowing EDAM to move forward.
- View comments from energy leaders across the West about the EDAM’s progress.
- Follow and participate in the EDAM Policy Initiative.
Participants
- Imperial Irrigation District – planned entry 2028
- Public Service Company of New Mexico – planned entry 2027
- Turlock Irrigation District – planned entry 2027
- LADWP – planned entry 2027
- Balancing Authority of Northern California – planned entry 2027
- PacifiCorp – planned entry 2026
- Portland General Electric – planned entry 2026
Entities leaning towards EDAM
- Idaho Power – Announced a leaning towards EDAM as its preferred day-ahead market (March 2024)
- NV Energy – read NV Energy's Public Utilities Commission application filing.
- PowerWatch (formerly BHE Montana) – Announced its intention to join EDAM following WEIM onboarding (August 2024)
Implementation documents
Public Service Company of New Mexico (PNM)
Imperial Irrigation District (IID)
Turlock Irrigation District (TID)
Los Angeles Department of Water & Power (LADWP)
Balancing Authority of Northern California (BANC)
- FERC Order No. ER25-663-00008/04/2025, 2:07 PM
- Balancing Authority of Northern California (BANC) – Extended Day-Ahead Market implementation agreement08/04/2025, 1:55 PM
PacifiCorp
- Apr 25, 2024 EDAM Entity Implementation Agreement - PacifiCorp08/13/2024, 2:26 PM
Portland General Electric
ISO staff is here to assist you. If you need additional information on participating in EDAM, please contact:
Adam Schultz
ASchultz@caiso.com
* These entities have publicly indicated a learning toward EDAM as their preferred day-ahead market