Access historical data for each instance from June 1999 through June 2016 ISO New England implemented ISO Operating Procedure No. 4: Action During a Capacity Deficiency (OP 4). The reports cover which OP 4 actions were taken, when they were implemented, and when they were canceled. Note that when the Forward Capacity Market was implemented in 2010, OP 4 was reduced from 16 steps to 11 steps.
For summaries of the instances when the ISO has implemented OP 4, see the OP 4 Implementation Summaries.
For power system notifications that have occurred since July 2016, view the current archive.