Can a Capacity Market Notice be cancelled?
Yes, following a Capacity Market Notice being active National Grid ESO systems will conduct the system margin calculation for all Settlement Periods up to four hours ahead. Where the volume of available generation is greater than 500MW above the forecast volume of demand and Operating Margin the Capacity Market Notice will be cancelled and communicated on this website.
All Capacity Market Notices will ultimately be cancelled and each cancellation will communicate the original "active from time" and updated "cancellation time". Where both these times are shown to be the same the Capacity Market Notice would effectively have been cancelled prior to the time in question. However, where these times are different the Capacity Market Notice would have persisted to real time and beyond.