P407 ‘Project MARI’

Formal title: Project MARI (Manually Activated Reserve Initiative)

The Manually Activated Reserve Initiative (MARI) is the pan-European project to deliver a platform for manually-activated Frequency Restoration Reserve (mFRR) as per Article 20 of the European Balancing Guideline (EBGL). P407 represents the changes to the BSC that are part of the joint BSCCo/National Grid ESO (NGESO) work to enable GB participants to use the platform as well as providing a further balancing product for NGESO.

While there are some similarities to TERRE in that both MARI and TERRE are European balancing products, MARI is a balancing product in it’s own right and should not be considered as being ‘like TERRE’. 

Article 20 of the EBGL (Commission Regulation (EU) 2017/2195) requires Transmission System Operators (TSOs) to establish a platform for the exchange of balancing energy from manually activated frequency restoration reserves (mFRR) by July 2022. To achieve this, the European Network of Transmission System Operators for Electricity (ENTSO-E) launched the Manually Activated Reserves Initiative (MARI) to deliver the European wide mFRR platform. P407 will ensure that the BSC, and associated systems, are amended ahead of go-live.

Project MARI webinar


Next Steps

The next cross-code Workgroup meeting will be held on 1 December 2020. Topics for presentation and discussion at the meeting will include the Settlement implications of the dispatch principles in the BSC solution and bid types within the Grid Code solution.

Downloading documents

If you have any problems or issues downloading or accessing any of the supporting documents on this page then please contact the highlighted Lead Analyst. Workgroup materials can be found in the Assessment Procedure section below.

Current Status

Initial Written Assessment
Assessment Procedure
Report Phase
With Authority
Awaiting Implementation


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