Access historical data for each instance ISO New England has declared a system condition other than normal, including:
The data below shows which actions were taken, where they were taken, when they were implemented, and when they were canceled.
Note: This archive dates from July 2016. For listings of OP 4 actions taken before July 2016, view the OP 4 archive, June 1999-June 2016. For summaries of the instances when ISO has implemented OP 4, see the OP 4 Implementation Summaries.
Select from the following to access HTML and CSV versions of all data for that year.