A CAISO market report says high natural gas prices drove a 50% run-up in electricity costs in Q4 2021, hitting the Western Energy Imbalance Market as well.

BPA is on track to enter the Western Energy Imbalance Market on May 3, despite lingering issues with software systems related to market integration.

CAISO's Board of Governors and the Western Energy Imbalance Governing Body adopted changes to WEIM's resource sufficiency evaluation for market participants.

CAISO's Western Energy Imbalance Market hit a record $739 million in member benefits in 2021, putting its total close to $2 billion since it launched in 2014.

Washington utilities Avista and Tacoma Power will not delay their entry into the Western EIM, despite BPA’s decision to postpone joining by two months.

The Bonneville Power Administration said it will delay its entry into the Western EIM by two months to work out technical and training issues.

Public Service Company of Colorado, Platte River Power Authority and Black Hills Colorado Electric said they plan to join SPP’s WEIS market in April 2023.

CAISO's Board of Governors extended controversial wheel-through restrictions for two more years as the ISO works on a long-term fix to transmission constraints.

Idaho Public Utilities Commissioner and WIRAB Chair Kristine Raper will join WECC as vice president of external affairs beginning Jan. 24.

Three stakeholder working groups charged with designing key elements of CAISO’s proposed extended day-ahead market for the Western EIM began meeting this week.