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December 5, 2025

CAISO Extended Day-Ahead Market (EDAM)

PNM
PNM Signs Agreement to Join CAISO’s EDAM

Public Service Company of New Mexico made it official: The utility signed an implementation agreement to begin participating in CAISO’s Extended Day-Ahead Market in fall 2027.

Quanta Infrastructure Solutions Group
New CAISO-Powerex Dispute Centers on ‘Voluntary’ Nature of EDAM
CAISO dismissed Powerex’s contention that the ISO only recently has “revealed” that participation in its EDAM is voluntary at the balancing authority level but not voluntary for “individual customers” operating within the BA participating in the market.
CAISO
Panel Ponders Impacts, Priorities Around Western Market Seams

The formation of two competing day-ahead markets will create seams across the West, but at least one utility representative is more worried about seams resulting from the fracture of CAISO’s real-time Western Energy Imbalance Market.

PacifiCorp
CAISO Approves New EDAM Congestion Revenue Allocation Design
CAISO's Board of Governors and the Western Energy Markets Governing Body approved a new method for allocating certain congestion revenues in the ISO's Extended Day-Ahead Market, set to launch in 2026
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Tri-State Tells Colorado PUC Joining SPP RTO in Public Interest
Tri-State asked the Colorado Public Utilities Commission to find it would be in the public interest for the power supplier to join SPP, saying integrating with the RTO would bring significant benefits.
Seattle City Light
Former Seattle City Light CEO Nominated for WEM Governing Body

Former Seattle City Light CEO Debra Smith has been nominated to join the Western Energy Markets (WEM) Governing Body, with a three-year term to begin July 1. 

The Brattle Group
Expanded EDAM Would Reduce Curtailment, Costs, Study Finds

California Energy Commission staff presented a study on the size of CAISO’s Extended Day-Ahead Market, finding more benefits as the market’s footprint increases.

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FERC not in Charge of Modernizing Western Grid, Christie Says

Outgoing FERC Chair Mark Christie and former Colorado Gov. Bill Ritter both emphasized that the West controls the future of the Western interconnection, not Washington.

Shutterstock
UPDATED: ‘Pathways’ Bill Passes California Senate on 36-0 Vote

A California bill to implement the West Wide Governance Pathways Initiative’s Step 2 proposal passed the state Senate in a unanimous vote.

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Industry Needs ‘New Planning Paradigm,’ BPA Chief Tells Regulators

BPA CEO John Hairston’s keynote at the annual meeting of the WCPSC spotlighted a theme that would dominate discussion at the event: the looming prospect of overwhelming growth in electricity demand in the West and across the U.S.


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