February 23, 2025

CAISO Extended Day-Ahead Market (EDAM)

The Brattle Group
Brattle Study Shows Big Benefits for California in ‘Expanded’ EDAM
California ratepayers would save millions more in a CAISO Extended Day-Ahead Market encompassing nearly all the West than in one that includes only those utilities likely to join the market, according to a new Brattle Group study.
Shutterstock
El Paso Electric to Join SPP’s Markets+ in 2028
El Paso Electric says it will join SPP’s regional day-ahead Markets+ service offering in a “strategic move … tailored” to meet expected customer load growth and evolving needs.
© RTO Insider LLC
Ariz. Commissioner Questions Utility Decisions to Join SPP’s Markets+
Arizona Corporation Commissioner Kevin Thompson said he thinks his state’s four major utilities may have erred in committing to joining SPP’s Markets+ instead of CAISO’s Extended Day-Ahead Market.
TCF Architecture
Chelan PUD Commits to SPP Markets+ Phase 2 Funding
Markets+ notched another in a string of successes when the Chelan County Public Utility District in Washington said it will pay its $1 million to $2 million share of funding for the market’s Phase 2 implementation stage.
CAISO
FERC Approves CAISO’s SWIP-North Development Agreement
FERC approved an agreement between CAISO and LS Power to develop a transmission line that would deliver Idaho wind power into California and could help secure Idaho Power’s participation in the ISO’s Extended Day-Ahead-Market.
WER Architects Planners
SPP Markets+ Tariff a ‘Home Run’, Staff Says
FERC approved SPP’s tariff for Markets+ with minor modifications in what the RTO’s staff described as a “home run” during the Markets+ Participant Executive Committee’s meeting.
Powerex
Powerex Commits to Funding, Joining SPP’s Markets+
Powerex says it will fund the next phase of SPP’s Markets+ and “re-affirmed” its commitment to joining the Western real-time and day-ahead offering.
SPP
SPP Markets+ Tariff Wins FERC Approval

SPP reached a key milepost in its Western efforts when FERC conditionally approved its tariff for Markets+, a highly anticipated decision likely to ramp up the competition with CAISO’s Extended Day-Ahead Market.

Bonneville Power Administration
In Letter to Senators, BPA Tempers Markets+ Leaning
The Bonneville Power Administration tamped down expectations that it is all in on SPP’s Markets+, clarifying in a recent letter to lawmakers representing Oregon and Washington that it’s still weighing the pros and cons of joining a day-ahead market.
The Bonneville Power Administration
BPA Market Decision on Track Despite Calls for Delay
BPA remains on track to issue a decision on which day-ahead market to join by May 2025 despite calls to delay it until fall 2025 to give the agency more time to reconsider its leaning toward SPP’s Markets+.

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