January 22, 2025

Western Energy Imbalance Market (WEIM)

West-Wide Governance Pathways Initiative
Revised Pathways Proposal Focuses on Sector Issues
The West-Wide Governance Pathways Initiative has revised its “regional organization” stakeholder process proposal to expand the size of a key stakeholder committee and boost representation for some groups.
APS
Ariz. Utilities Required to Report on Day-ahead Market Activities
When Arizona utilities file their next integrated resource plans, they’ll be required to include an analysis of cost savings and other benefits they could realize from Western regional market participation.
NOAA
Batteries, Energy Transfers Support ‘Uneventful’ Summer in West
The growth of battery storage resources in the West largely contributed to an "uneventful" summer on the grid, despite record-breaking peak loads and temperatures.
CAISO
CAISO Launches Phase 2 of Pricing Issues Initiative
The next phase of the Price Formation Enhancements Initiative will look to address issues around market power mitigation, scarcity pricing and fast-start pricing.
CAISO
July Sees New Western Peak Despite Moderate CAISO Demand
The Western Interconnection reached a record-breaking peak load July 10 despite relatively moderate demand in CAISO, the ISO said during a meeting of its Market Performance and Planning Forum.
West-Wide Governance Pathways Initiative
Comments on Western RO Stakeholder Plan Show Complexity of Effort
Stakeholder comments filed with the West-Wide Governance Pathways Initiative illustrate the complexity of building the new kind of Western regional organization envisioned by backers of the effort.
Black Hills Energy
CAISO’s WEIM Plucks Black Hills Utilities from SPP’s WEIS
CAISO scored a geographically small but symbolically significant victory with the announcement that two Black Hills Energy subsidiaries will move to the ISO’s Western Energy Imbalance Market.
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.

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.

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