P421 ‘Align BSC with Grid Code for TERRE Market Suspension’

The Authority approved P421 on 11 March 2022 with an Implementation Date of 18 March 2022.

At the Panel meeting on 9 December 2021, Ofgem noted that there was a risk that they will be unable to make a decision on P421 by 3 February 2021, which is required to meet the standard February 2022 Release. Were this to happen, P421 would ‘time-out’ and be closed.

To mitigate this risk Ofgem requested the following revised Implementation Date for P421 (in accordance with Section F2.11.18).

• 24 February 2022, if the Authority’s decision is received after 28 October 2021 but before 3 February 2022; or
• Five Working Days (+5WDs) following the Authority’s decision, but no earlier than 3 March 2022, if the decision is received after 3 February 2022
  • Please note if a decision is received after the 3 February 2022 but before the 3 March 2022 we will treat this for the purposes of implementation of having been received on the 3 March 2022 (to avoid conflicting with the standard February 2022 Release).

A consultation was held on the above between 16 December 2021 and 31 December 2021 and no responses were received to this consultation. Ofgem gave notice of the updated implementation approach on 20 January 2022.

The BSC Panel agreed to send P421  to the Report Phase with a 1 calendar month consultation. Responses were invited until Monday 20 September 2021. No responses were received to the consultation. 

The Draft Modification Report was presented to the BSC Panel on 14 October 2021 where the Panel recommended the following to the Authority:

• That P421:
  • DOES better facilitate Applicable BSC Objective (a);
  • DOES better facilitate Applicable BSC Objective (e);
• That P421 should be approved;
• An Implementation Date for P421 of:
  • 4 November 2021 if an Authority decision is received on or before 28 October 2021; or
  • 24 February 2022 if an Authority decision is received after 28 October 2021 but on or before 3 February 2022; and
• That the BSC legal text for P421 be approved.

P421 was raised by National Grid ESO on 1 July 2021.

The BSC Panel  considered the Initial Written Assessment at its meeting on 8 July 2021 and deferred its decision on how to progress the Modification to its meeting on 12 August 2021. The P421 Update paper below gives further information in response to questions that the Panel raised in their July meeting.