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 Says Constrained Tx Contributed to Blackouts
A report on the causes of California’s August blackouts contends that constrained transmission prevented much needed imports from reaching the state.
FERC OKs CAISO EV Charging, Storage Updates
FERC approved a CAISO Tariff change to increase demand response participation by businesses offering on-site electric vehicle charging.
Calif. IOUs Escape Blame for Fires so Far
Wildfires have burned nearly 4 million acres in California this year, but there’s little indication utility equipment played a role.
CAISO Governors Say Hello, Goodbye
The CAISO Board of Governors bid farewell to its retired CEO, greeted a new leader and approved a plan to implement FERC Order 831.
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.
FERC OKs CAISO Cost Recovery Plan for Gas
CAISO won FERC approval for its second effort to allow generators to recover the costs of higher natural gas prices.
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CAISO Retiring, Incoming CEOs Field Questions
CAISO's outgoing and incoming CEOs answered stakeholder questions in a roundtable discussion hosted by the EIM’s Regional Issues Forum.
FERC Accepts CAISO Intertie Changes
FERC gave fast-track approval to CAISO Tariff changes meant to discourage sellers from failing to deliver on import energy bids.
CAISO Seeks ‘Firm’ Tx for Resource Adequacy
A CAISO resource adequacy workshop could not have been more timely following the heat waves and energy emergencies of mid-August and Labor Day weekend.
Heat Waves, Blackouts Slow Western EIM Expansion
Heat waves and capacity shortfalls have slowed an effort by the Western EIM to expand from a real-time interstate trading forum to a day-ahead market.

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