P408 ‘Simplifying the Output Usable Data Process’

P408 is being raised as a consequential BSC Modification to Grid Code Modification GC0130.

The modification aims to deliver:

  • Continued alignment of the Grid Code and BSC processes; and
  • Improved market transparency and efficiency through provision of additional Output Usable, Margin and Surplus data in the two to three year ahead timescale.

Formal title: Simplifying the Output Usable Data Process as a consequence of GC0130

Current Status

Initial Written Assessment
Assessment Procedure
Report Phase
With Authority
Awaiting Implementation


Grid Code (GC) Modification GC0130 seeks to simplify the process for Generators to submit outage information to National Grid Electricity System Operator (NGESO), and to reduce duplication in the data submission process.  This data is used by NGESO to calculate National Output Usable, as well as Margin and Surplus data which is published on the Balancing Mechanism Reporting Service (BMRS) as required by Section Q of the Balancing and Settlements Code (BSC)


NGESO raised P408 on 5 May 2020. P408 will run alongside a similar Modification Proposal (GC0130) for the Grid Code which was put out to Code Administrator Consultation on 21 April 2020. At its meeting on 154 May 2020, the BSC Panel unanimously agreed that P408 should be progressed directly to the Report Phase for industry consultation.

Next Events

P408 will be submitted for Report Phase consultation during week commencing 18 May 2020.


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