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March 22, 2026

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.
California GHG Rules Keep Edison Focused on ‘Wire Side’
Edison International (NYSE:EIX) will continue to upgrade its t&d networks to take advantage of laws aimed at reducing greenhouse gas emissions.
CPUC Contests ISO Incentive for PGE
The California PUC (CPUC) is protesting the FERC decision to allow PG&E (NYSE:PCG) to include an ISO adder in its 2017 transmission rates proposal.
UPDATE: Council OKs Seattle City Light Bid to Explore Joining EIM
The Seattle City Council authorized Seattle City Light to conduct a cost-benefit analysis on joining the Western Energy Imbalance Market (EIM).
FERC Denies Rehearing on SDGE Abandonment Incentive
FERC denied San Diego Gas & Electric’s (SDG&E) request for rehearing of an order that limited the amount the utility can be reimbursed.
PacifiCorp Increases Share of EIM Benefit in Q3
PacifiCorp reaped well more than half the $26.16 million in gross benefits yielded by the Energy Imbalance Market (EIM) in the third quarter, CAISO said.
CAISO Board Approves Broader LSE Definition
The CAISO Board of Governors voted to expand the definition of a “load-serving entity” to include the San Francisco BART and other organizations.
Foes Narrow Differences at FERC Summit on EIM Bidding
Last week's FERC technical conference on the EIM began on a contentious note but concluded with participants understanding each others’ perspectives.
Price Tag on Tx Needed to Meet California 50% RPS: $5B?
Meeting the California RPS goal of 50% target could require more than $5 billion in transmission upgrades, according to a state report.
SMUD to Join EIM in Spring 2019 at the Earliest
The Sacramento Municipal Utilities District (SMUD) will join the Western EIM in spring 2019 at the earliest, according to the head of BANC.
FERC Rejects CAISO Refunds over Must-Offer Charges
FERC rejected the CAISO effort to refund $217 million that the ISO said were overcharged for payments to generators operating under must-offer obligations.

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