Western Energy Imbalance Market (WEIM)

Western Energy Markets
Caution Urged as Regulators Consider NV Energy’s Request to Join EDAM
Some parties are urging Nevada regulators to wait until initial results are in for CAISO's Extended Day-Ahead Market before deciding whether to allow NV Energy to join.
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EDAM Town Hall Highlights ‘Pivotal Moment for the West’
CAISO leaders staged a virtual “town hall” to stress the importance of a smooth rollout to the ISO’s Extended Day-Ahead Market in May and promise to address market seams issues.
Shutterstock
Pathways Asks CAISO to Kickstart ROWE Funding Discussions
The West-Wide Governance Pathways Initiative’s Launch Committee asked CAISO to initiate a stakeholder process to create a funding mechanism for the newly incorporated organization that is slated to assume governance over the ISO’s energy markets.
Pattern Energy
Western Market Seams Complicate Data Center, Clean Energy Investments, Panelists Say
As the West appears to move toward two separate day-ahead markets, data center developers like Google and clean energy companies are investing with the intent to mitigate seams and ensure operational consistency, panelists at an Advanced Energy United webinar said.
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CAISO Issues 1st Report Under Independent Governance Law
CAISO released its first mandatory report under the California assembly bill that paves the way for an independent regional organization to assume responsibility over the ISO’s energy markets.
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Pathways’ ROWE Incorporated in Delaware, Board Search Underway
Delaware approved the certificate of incorporation for the ROWE, and an executive search firm has been hired to vet candidates for the organization’s initial board, the Pathways Initiative’s Launch Committee announced.
Black Hills Energy
Black Hills Completes $350M Tx Project as New BA Prepares to Join CAISO’s WEIM

Black Hills Energy completed construction on a 260-mile, $350 million transmission expansion project that will interconnect electric systems in Wyoming and South Dakota, while expanding the footprint of CAISO’s Western Energy Imbalance Market.

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WRAP Builds Momentum, Faces Challenges Heading into 2026
With 16 binding participants and 58 GW worth of load committed, the Western Power Pool’s Western Resource Adequacy Program aims to build on the momentum in 2026 and prepare for more members.
IMCO
Idaho Power Can Retain Market-based Rate Authority, FERC Rules
Idaho Power can continue to sell power at market-based rates after it acquired more than 200 MW in resources 2023 and 2024, FERC ruled.
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CAISO Readies EDAM Tariff Changes as New Market Nears Opening
CAISO is proposing a set of tariff changes for submission to FERC early in 2026 to help ease participants into the ISO’s new Extended Day-Ahead Market.

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