How is a System Stress Event determined?

In the event of a demand control event National Grid ESO will conduct the following analysis to determine whether the:-

• demand control event lasted for a period longer than 15 minutes
• volume of demand control instructed was greater than the volume of generation curtailed by National Grid ESO in the same Settlement Periods
• demand control event was not resultant from the fault(s) on the electricity transmission or distribution networks

Where the answer to each question is yes a period of System Stress will be communicated on this website.