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Design Working Group

The DWG has been tasked with supporting Ofgem in the ELEXON led project to design and assess the Target Operating Models (TOMs) for Market Wide Half-Hourly Settlement (HHS).

What’s new

Next meeting papers have been circulated to membership and published.

About TOMS

Development of the TOMs forms part of the Ofgem led Significant Code Review (SCR) for Market Wide HHS.

This will be done in two stages:

The first stage:

This will look to develop and assess a number of Skeleton TOMs for delivery of a product to Ofgem in early 2018. The DWGs will also develop a high level view of the system architecture required to deliver the TOMs.

The Second stage:

This will look to develop the detailed TOM following the outcomes of the Ofgem policy decisions. Ofgem will lead on the final decision making process following the outcome of the Business Case decision.


The DWG will be chaired by ELEXON and have experts from all aspects of the energy community, including consumer representatives, industry organisations and innovators/new technology bodies.

Design Working Group - Historical Meetings

  • DWG 06 14 March 2018, 10:00 - 16:00

  • DWG 05 14 February 2018, 10:00 - 16:00

  • DWG 04 10 January 2018, 10:00 - 16:00

  • DWG 03 13 December 2017, 10:00 - 16:00

  • DWG 02 15 November 2017, 10:00 - 16:00

  • DWG 01 11 October 2017, 10:00 - 16:00