Western Energy Imbalance Market (WEIM)

Spring Oversupply Lifts CAISO Curtailments
CAISO is curtailing an increasing volume of renewable generation this spring as the ISO sees its “duck curve” already dipping to levels forecast in 2021.
EIM Governing Body OKs Charter Expansion; Retains Schmidt
EIM Governing Body members approved a measure that would give them increased power to make changes to the market’s governing charter.
EIM Panel Backs Schmidt for 2nd Governing Body Term
The Energy Imbalance Market nominating committee is recommending that Kristine Schmidt be reappointed to the market’s Governing Body.
Western Regulators Supportive of EIM Charter Changes
Western state utility commissioners expressed support for providing the CAISO EIM Governing Body with increased authority.
Stakeholders Advance on Western Regional Forum Proposal
Participants in a forum created by CAISO to discuss EIM issues and want to move quickly to complete an evaluation that will shape the group’s role.
EIM Charter Changes Would Give Governing Body More Power
CAISO management is proposing to amend the EIM charter to explicitly provide the market’s Governing Body with a voice in any future governance changes.
CAISO, BPA Ink Agreement to Ease Northwest EIM Transfers
CAISO has signed a transmission agreement with the Bonneville Power Administration designed to facilitate Energy Imbalance Market transfers.
Behind-the-Meter Generation Complicating EIM Load Forecasting
The unpredictability of cloud cover, which can cause sharp and sudden drops in solar production, creates a challenge for load forecasting in the EIM.
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Western Stakeholders Support Continuing EIM Regional Forum
Stakeholders and EIM Governing Body members gathered in Las Vegas to express their support for the CAISO-created Regional Issues Forum.
SMUD Balancing Area Inks Agreement for EIM Membership
The balancing area for the Sacramento Municipal Utilities District signed an agreement allowing SMUD to join the Western EIM in 2019.

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