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December 5, 2025

SPP Markets+

© RTO Insider LLC
‘Islanded’ BAs Face Tough Choices in Western Market Future, Experts Say
Although one of the aims of day-ahead markets in the West is to fix a fragmented transmission landscape, some islanded entities will have a tough time navigating seams issues likely to arise as markets take shape, analysts at Aurora Energy Research said during a webinar.
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.

SPP
SPP Launches Markets+ Phase 2 With $150M Secured
SPP secured $150 million in financing and entered the second phase of development for its day-ahead market Markets+, the grid operator announced.
PacifiCorp
Northwest Summers Now Include ‘Huge’ Energy Flows from California

Portland General Electric told Oregon regulators that after decades of electricity flowing from north to south through its system during the summer, the flow on a typical summer day has reversed.

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.

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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.
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.

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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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