National Grid Warning Notices

The following are types of Operational System Warnings

• Electricity Margin Notice 
• High Risk of Deamd Reduction - at times where there is insufficient margin to meet operating reserve requirements
• Demand Control Imminent - issued before demand reduction actions are taken
• Risk of System Disturbance - often localised warning e.g. a severe storm
• Cancellation of a GB System Warning

These are issued by fax and BM reprorts website but can also be seen on STDT.

The following are types of System Margin Warnings NG could issue

• Capacity Market Notice
• System Stress Event 

NG must publish a Capacity Market Warning when:

• This is triggered where the volume of available generation above forecast demand and Operating Margin is less than 500MW. 
• NG issue a Demand Reduction instruction or emergency manual disconnection
• An automatic low frequency demand disconnection takes place

Notices are initially issed 4 hours ahead of when the problem is foreseen. 

• Call the stations and ask if its possible to delay any ROTA's
• Ask if the themral plants could produce any more
• Log calls
• Check trading position
• Email the relevant people about the warning and keep them informed.
  - Operational System Warning = ^ElectricitySystemNotice
  -Capacity Margin Notice and System Stress Event = ^Capacity_Market_Notifications and avon metals