FAQs
Below is a list of our most frequently asked questions. If you have a question that isn't listed below, please contact us.
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.
Related FAQs
- What is a Capacity Market Notice and how is it triggered?
- What is a Capacity Market Notice not?
- What is included within a Capacity Market Notice when it becomes active on the website?
- What is included within the Demand figure?
- What is included within the Aggregate BM figure?
- How should I respond to a Capacity Market Notice?
- What other information is available to the industry?
- How do Capacity Market Notices differ to System Warnings messages that appear on the Balancing Mechanism Reporting Service (BMRS)?
- Will a Capacity Market Notice always be followed up by an operational System Warnings message?
- Is the Capacity Market Notice actively updated following its initial communication?
- Can a Capacity Market Notice be issued for any period less than four hours away?
- If a Capacity Market Notice is cancelled can one be reinstated as active at a later time from the same time?
- How many Capacity Market Notices will be published each year?