Capacity Market Notices

A Capacity Market Notice is a signal four hours in advance that there may be less generation available than National Grid, acting as System Operator, expects to need to meet national electricity demand on the transmission system taking into account additional operational reserve requirements. The notices are intended to be a signal that the risk of a System Stress Event in the GB electricity network is higher than under normal circumstances.

Capacity Market Notices are communicated automatically by National Grid systems to the following website:
gbcmn.nationalgrid.co.uk (to learn more about Capacity Market Notices and System Stress Events please refer FAQs on the website).

In the event of a Capacity Market Notice being activated, it is recommended that industry participants make themselves aware of other operational information available to the industry closer to the time the notice is active from.

Under the Rules of the Capacity Market, Capacity Providers are needed to only generate during a System Stress Event.

If a Capacity Provider fails to deliver its Capacity Obligation, penalty charges will be applied in accordance with Electricity Capacity Regulations. Similarly, Capacity Providers will be paid for over delivery if they deliver above their Capacity Obligation.​