Information on Under Frequency Reserves and Secondary Risk

Purpose of this page

From time to time the system operator publishes information, via CANs,  about:

  • how under frequency reserves are calculated,
  • energy supplies which are classified as secondary risks. (I.e. there is a probability that they will trip during an under frequency event).

To assist participants in making market decisions these CANs are available on this page. 

Other CANs and Information of Interest

Document Date
RMT Urgent Update  [ pdf 256.45 KB ] 10 Feb 2017
CAN Update on Change in HVDC Bipole Risk [  183.57 KB ] 16 Dec 2015
CAN Change in HVDC Bi-pole Risk [  263.72 KB ] 15 Dec 2015
CAN Change in HVDC Bipole Risk [  181.84 KB ] 11 Dec 2015
CAN Change in HVDC Bipole Risk [  180.03 KB ] 11 Dec 2015


List of Related CANs