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.
CAISO Recounts Tense Hours Leading to May 3 Emergency
A CAISO operations shift manager recounted how and why the ISO declared its first Stage 1 emergency in 10 years on May 3.
California Governor’s Office of Emergency Services
Hydro, Solar Boost CAISO Summer Outlook; Aliso Concerns Remain
The continued closure of the Aliso Canyon natural gas storage facility remains an issue for the summer readiness of the Southern California grid.
CAISO Initiative Could Toss Lifeline to Struggling Generators
A new CAISO initiative could allow power producers a way to temporarily suspend the operation of an unprofitable generating plant.
Monitor Report Shows Sharp Decline in CAISO Costs
CAISO’s wholesale costs to serve load last year fell by 9%, the lowest nominal expense since 2008, according to an annual market performance report.
California Grid Emergency Comes Days After Reliability Warning
CAISO experienced its first “Stage 1” grid emergency in nearly a decade, days after Southern California Gas' warning about Aliso Canyon.
California Here We Come?
Witness after witness at the FERC technical conference cited California competitive wholesale markets, often in an unflattering context.
CAISO Proposes Rules for Distributed Resources, Storage
CAISO is moving forward with an initiative meant to ease the integration of energy storage and distributed resources into its markets.
PGE Affirms Strategy to Help Meet Calif. Environmental Goals
Pacific Gas and Electric isn’t having second thoughts about its strategy of capitalizing on California’s greenhouse gas reduction goals.
CAISO EIM Exports Rise with Spring, Report Shows
EIM transfers out of CAISO were on the upswing in March, re-establishing a pattern first seen last spring with California’s growing solar surpluses.
SPP Names CAISO’s Collins to Lead MMU
SPP named Keith Collins, CAISO manager of monitoring and reporting and former FERC official, as the new executive director of its Market Monitoring Unit.

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