March 10, 2025

Western Energy Imbalance Market (WEIM)

The Brattle Group
Markets+ ‘Equitable’ Solution to Seams Issues, Backers Say
Proponents of SPP’s Markets+ contend in their latest “issue alert” that the framework provides a much more equitable solution to tackling market seams than under CAISO’s EDAM.
Bonneville Power Administration
‘Leaning’ Evident in BPA Response to NW Senators
CAISO’s adoption of the Pathways Initiative’s “Step 1” changes won't overcome BPA’s objections to the governance of the ISO’s EDAM, Administrator John Hairston told U.S. senators from the Pacific Northwest.
Western Power Pool
WRAP Members Vote to Delay ‘Binding’ Phase to Summer 2027
The Western Resource Adequacy Program’s key stakeholder body approved a plan that would postpone the start of its penalty phase by one year, to summer 2027.
Tacoma Public Utilities
3rd ‘Issue Alert’ Compares Pricing Practices in Markets+, EDAM
Enhanced protections against uncompetitive market behavior are among several tools to ensure fair and accurate pricing under a Markets+ framework, according to the latest "issue alert" from entities that back its development.
Bonneville Power Administration
BPA Postpones Day-ahead Market Decision Until 2025
The Bonneville Power Administration will delay its decision on choosing between SPP’s Markets+ and CAISO’s Extended Day-Ahead Market until May 2025.
Stanford Woods Institute for the Environment
Single Western Market Best for Reliability Needs, Panelists Say
A single Western market is one of the safest bets to address the region’s reliability and cost issues in the face of extreme weather events, proponents of the West-Wide Governance Pathways Initiative said during a panel discussion.
CAISO
CAISO Kicks Off New Initiative to Streamline Bilateral Trading

A new initiative to streamline and expand bilateral trading in the Western Energy Imbalance Market and Extended Day-Ahead Market has been launched, marking another step toward EDAM implementation.

CAISO
CAISO, WEM Boards Approve Pathways ‘Step 1’ Plan
A proposal to elevate the Western Energy Markets Governing Body’s authority over CAISO energy markets was unanimously approved by the Governing Body and ISO Board of Governors
Arizona Public Service
Markets+ Backers Highlight Reliability in 2nd ‘Issue Alert’
The integration of Markets+ with the Western Resource Adequacy Program would be among a handful of key reliability benefits of SPP’s Western day-ahead offering, according to an “issue alert” published by 10 entities that backed development of the market.
© RTO Insider LLC
No Clear Blueprint for Western ‘RO’ Stakeholder Process
One thing has become abundantly clear after three intensive workshops this summer: there’s no blueprint for developing the stakeholder process for the “regional organization” envisioned by the West-Wide Governance Pathways Initiative.

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