California ISO - Documents By Group

Outcome
The ISO implemented its transmission reliability margin mechanism in December 2012. This change enables the ISO to make certain adjustments to intertie schedules in the pre hour-ahead market processes in anticipation of transmission constraints. This mechanism avoids the need for these adjustments within the operating hour, which can be disruptive by causing curtailment of bilateral trades. The margin values applied to each intertie are now visible through the ISO’s Open Access Same-Time Information System (OASIS). — Implemented: Dec. 11, 2012; FERC approval: June 5, 2012; Tariff amendment filing: April 10, 2012 (ER12-1468); Board of Governors approval: March 22, 2012