Western Energy Imbalance Market (WEIM)

Cold Snap Yields Record Q1 Benefits for Western EIM
CAISO's EIM provided its members $101.01 million in economic benefits during the first three months of 2021, an increase of 75% over a year ago.
Wheeling Debate Tests West, CAISO CEO Says
CAISO stakeholders are still wary of the new proposed wheel-through provisions the ISO has submitted to FERC for clarity on the complex issue.
EIM Governing Body Rejects Part of CAISO Summer Plan
The Western EIM Governing Body rejected CAISO’s proposal to head off summer capacity shortfalls by limiting wheel-throughs during times of scarcity.
West Needs to Add Transmission for Renewables, CEOs Say
Western states must work together to build transmission avoid blackouts, Idaho Power CEO Lisa Grow and CAISO CEO Elliot Mainzer agreed.
Expansion Takes EIM into LA, New Mexico
CAISO’s Western EIM notched another milestone as it welcomed the country’s largest municipal utility and extended its border to include much of New Mexico.
EIM Governing Body OKs Summer Readiness Measures
The Western Energy Imbalance Market approved two CAISO measures and endorsed a third to improve reliability, mitigate capacity shortfalls.
Texas Utility Plans to Join CAISO EIM
El Paso Electric, a utility that serves more than 400,000 customers in Texas and New Mexico, plans to join CAISO’s Western Energy Imbalance Market in 2023.
Western EIM Questions Performance in Shortfalls
The Western EIM Governing Body discussed CAISO’s summer energy shortfalls, pondering how the EIM could better serve participants during system stress.
Hairston Appointed BPA Administrator
BPA acting administrator and CEO John Hairston will officially assume the top job at the federal power marketing agency, the DOE said.
CAISO to Focus on Resource Adequacy in 2021
CAISO’s top priority in 2021 will be making sure there is enough generating capacity for summer after last year’s shortfalls.

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