September 30, 2024

Western Energy Imbalance Market (WEIM)

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.
CAISO
Heat Waves Spur Record EIM Benefits
Benefits for participants in CAISO’s EIM surged past $119 million in the third quarter, a record amount driven by heat waves in Aug. and Sept.
Study: Western RTO Could Yield $1.2B in Yearly Savings
The creation of a Western RTO could save the region more than $1.2 billion annually in electric costs, according to a new study.
CAISO Floats EIM Base Schedule Rule Changes
CAISO launched a two-part initiative Wednesday that would alter how Western Energy Imbalance Market participants submit their base schedules.

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