CAISO/WEIM

The California Independent System Operator serves about 80% of California's electricity demand, including the service areas of the state's three investor-owned utilities. It also operates the Western Energy Imbalance Market, an interstate real-time market covering territory that accounts for 80% of the load in the Western Interconnection.
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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.
Stakeholders See Shortcomings in Western Interregional Tx Planning
Stakeholders expressed concerns over how the Western Interconnection’s four transmission planning organizations can align their separate regional processes.
CAISO Stakeholders Seek Clarity on Black Start Procurement Plan
CAISO market participants continue to seek more details about an “expedited” ISO proposal to procure black start resources.
PGE Sees Future Growth Tied to EVs
PG&E earned $692 million during the fourth quarter of 2016, compared with $134 million during the same period a year earlier.
Local Officials Appeal to FERC as Oroville Water Levels Recede
Butte County urged FERC to order the California Department of Water Resources to establish its own public safety program to help manage the Oroville Dam.
High Hydro, Increased Solar Point to Spring Curtailments for CAISO
CAISO may curtail a massive amount of renewable energy this spring when increased solar output is expected to coincide with increased hydropower.
CAISO Proposes TO-focused Black Start Procurement
CAISO’s straw proposal for procuring black start resources would entail significant collaboration with affected transmission owners.
Questions Linger over CAISO Small TO Interconnection Proposal
Stakeholders have lingering questions about the CAISO interconnection proposal to protect small transmission owners from bearing the costs of upgrades.
CAISO Takes First Stab at Defining Frequency Response Market
CAISO officials and stakeholders discussed the ISO's primary frequency response product initiative.

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