P344 ‘Project TERRE’

Formal title: ‘Project TERRE implementation into GB market arrangements’

Current Status

Initial Written Assessment
Assessment Procedure
Report Phase
With Authority
Awaiting Implementation


P344 was raised to align the Balancing and Settlement Code (BSC) with the European Balancing Project TERRE (Trans European Replacement Reserves Exchange) requirements. This is in order to allow the implementation of the TERRE balancing product at national level and hence ensure compliance with the European Electricity Balancing Guideline (EB GL). 

The implementation of P344 will be split between Wider Access (December 2019) and TERRE in summer 2020.


The first part of P344’s implementation was on 28 February 2019 as part of the February 2019 BSC Release. Whilst the documentation was implemented, only the provisions relating to market entry and registrations are active. The remaining implementation will be in two parts – Wider Access (increasing GB access to the market) went live on 11 December 2019. The remaining part of P344, the European TERRE part, will be in Summer 2020.

National Grid raised P344 on 1 June 2016. The Panel considered the initial written assessment (IWA) at its meeting on 9 June 2016, where it agreed to an initial three-month assessment with an interim assessment report to be brought to it at its meeting in September. From this point onwards, the P344 Workgroup developed the solution to P344.

The Second P344 Assessment Procedure Consultation closed on 30 January 2018. The Workgroup finalised the solution at its meeting on 22 March 2018. The Assessment Report was presented to the BSC Panel at its meeting on 10 May 2018 for its initial recommendations, whereby it initially recommended that the Proposed Modification be approved and the Alternative Modification rejected.

The Report Phase Consultation closed on 1 June 2018 and the Draft Modification Report was presented to the BSC Panel for decision at its meeting on 14 June 2018. The BSC Panel recommended to the Authority that the P344 Alternative Modification (mandatory sharing of HH delivered volumes with the customer’s Supplier) be approved and the Proposed Modification (customer consent required for sharing of HH delivered volumes with customer’s Supplier) be rejected. 

Ofgem determined on 24 August 2018 that the P344 Proposed Modification (customer consent required for the sharing of HH delivered volumes with the customer’s Supplier) be approved for implementation on 28 February 2019 as part of the February 2019 BSC Release.

On 28 November 2019 Ofgem granted National Grid ESO’s request for a derogation from participation in Project TERRE. 

Read full details and the ELEXON response on the Project TERRE derogation decision.

Five industry working groups (IWGs) were formed to discuss and develop the processes that support TERRE in the Code Subsidiary Documents (CSDs). These IWGs can be found on the ELEXON website under Committees & Groups – Industry Working Groups

Next Events

We will continue to work with NGESO to ensure we are ready for TERRE go-live in summer 2020.


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