Consultations for all Process, Operational and Credit areas

This page lists all Consultations relating to BSC and code processes, Market Entry and Compliance, and Operations and Settlement. The consultations allow ELEXON to gather feedback from the industry about proposed changes so that any concerns are considered as part of our processes.

This list does not include Change Consultations.

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Consultation on the Market Index Definition Statement Review 2019


The Market Index Definition Statement (MIDS) defines the use of Market Index Data to calculate the Market Index Price (MIP), a price reflective of wholesale electricity for a Settlement Period in the short term market. An annual review of this document is required by the BSC, to ensure that the MIP is providing a reasonable reflection of the price of wholesale electricity in the short term market.

Changes were made to the MIDS as part of BSC Modification P377 ‘Amending Gate Closure references in Market Index Data’, which was implemented on 18 April 2019.

Our yearly analysis suggests that there are no further changes to the MIDS required at this time, with the current Individual Liquidity Threshold (ILT), timeband weightings and product weightings remaining suitable.


Please respond using the consultation response proforma and send your responses, entitled ‘MIDS Review 2019 Consultation’, to by Thursday 10 October 2019.

Responses to this consultation will be considered by the Imbalance Settlement Group at its meeting on 22 October 2019, where a final recommendation will be made to the BSC Panel for approval.

P350 draft reference network mapping statement for Reference Year 2018-19


We issued a consultation on the draft reference network mapping statement for Modification P350 ‘Introduction of a seasonal Zonal Transmission Losses scheme’ to each Party. The network mapping statement is used for determining Nodal power flows in the calculation of Transmission Loss Factors. 


Please respond using the consultation response form and send your responses, entitled  ‘P350 Draft Reference Network Mapping Statement’, to  by 17.00 on Friday 13 September 2019.

Changes to the CAP Review Process: 12 August 2019


We invite Trading Parties to indicate whether they agree with the proposal to set new CAP values based on the estimated reference price on the implementation date of the new CAP. We also invite Parties to indicate if they agree the trigger level (the value from which if the reference price deviates by, then a review of the CAP is triggered) should be automatically set. These proposed changes will allow for a more efficient process whilst maintaining the necessary levels of control.

Consultation for Allocation of a New Grid Supply Point (GSP) to a GSP Group 21 June 2019


ELEXON has received a new GSP registration application from the Transmission Company.  National Grid Electricity Transmission (NGET) is connecting a new GSP at Islington, which will form a connection between the existing High Voltage 400kV substation at Highbury and the UK Power Networks Distribution System in the London region.  This new GSP will be known as Holloway/Islington (GSP_HOLL_1).

The Transmission Company propose that GSP HOLL_1 is allocated to the London (_C) GSP Group.


If you have any views on the allocation of the above GSP to the London GSP Group, please respond using the consultation response form, and send to by 17:00 on 5 July 2019.

Your response should be titled Holloway/Islington GSP Registration.

P350: Methodology for Load Periods and Sample Settlement Periods Consultation 19 June 2019


Modification P350 ‘Introduction of a seasonal Zonal Transmission Losses scheme’ introduced a Transmission Loss Factor (TLF) for each TLF Zone and BSC Season, so transmission losses can be allocated on a geographical basis. P350 went live on 1 April 2018.

This Consultation details the proposed methodology for setting Load Periods and Sample Settlement Periods to be used in the derivation of Zonal TLFs, as required by the Balancing and Settlement Code (BSC).


We encourage you to respond to this consultation using the consultation pro-forma. The consultation period will end on Friday 5 July 2019 at 17:00. Please return responses to:

At the end of the consultation period, ELEXON will consider all responses and, if required, update the methodology accordingly. The methodology, along with all consultation responses, will be presented to the Imbalance Settlement Group (ISG) meeting next month to request approval of both the methodology and actual LPs and SSPs.

Upon approval, ELEXON will publish the actual LPs and SSPs on the website on or before 31 August 2019. 

Use of unused BSC provisions consultation


ELEXON would like to understand current industry views on certain unused or redundant provisions in the BSC. We are interested in views on whether some or all of the obligations mentioned in this consultation should remain in the BSC.

The consideration to remove unused provisions came about as part of our continued focus on the efficiency of the Code, as well as through our preparations for the Foundation Programme.

The consultation is to discover industry opinion on removing unused or expired provisions from the BSC.


This consultation closed 17:00 Friday 5 July 2019.

DWG’s consultation on transitioning to Market-wide Half Hourly Settlement


The DWG has developed its approach for transitioning from the current Settlement arrangements to the Target Operating Model (TOM) for Market-wide Half Hourly Settlement (MHHS).

This consultation is your opportunity to comment on the transition approach as developed by the DWG, before Ofgem makes the final decision whether to approve it.

MHHS is a fundamental reform that will affect both existing and future participants in the energy market. The DWG therefore encourages views from all stakeholders.


Please email responses to using the response form by 08:00 on 8 July 2019.

Further information

You can find more information about the DWG on the Design Working Group page of our website.

Credit Assessment Price consultation: 4 March 2019


Following a decrease in forward market prices, a Credit Assessment Price (CAP) review was triggered. We have issued a consultation paper on the value of the Credit Assessment Price.

We propose to decrease the value of CAP to £49/MWh from the last notified CAP value of £56/MWh.


Trading Parties can comment on this consultation using the consultation proforma. Please send your responses to by 17:00 on 12 March 2019.

Background information

ELEXON has produced a set of data visualisation graphs that show the reference CAP and the live CAP and are used by ELEXON to support the regular CAP Review process.


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