Notification of revised ISO Transmission Reliability Margin Implementation Document

The California ISO has revised the Transmission Reliability Margin Implementation Document, version 4.1, effective May 7, 2026. The document is available on the Modeling, data and analysis webpage.

Contact information

Please contact the CAISO/RC West Procedure Control Desk at ProcedureControl@caiso.com or RajaShekar Thappetaobula at 916-608-1209 or RThappetaobula@caiso.com with any questions.