Treatment of De-energised Metering Systems in Charging Data Reported to National Grid

We implemented the P402 Alternative Modification ‘Enabling reform of residual network charging as directed by the Targeted Charging Review’ in the February 2022 Balancing and Settlement Code (BSC) Release.  

P402 and the new charging arrangements

It requires Distribution Network Operators (DNOs) and Independent DNOs (IDNOs) to provide National Grid with data required for them to forecast and bill Demand Residual Transmission Network Use of System (TNUoS) charges in line with new charging arrangements effective from April 2023. The new arrangements are part of the outcomes of Ofgem’s Targeted Charging Review. 

Treatment of de-energised Metering Systems 

We have received feedback from a Supplier preparing for the implementation of the new charging arrangements that Licensed Distribution System Operators (DNOs and IDNOs) may not be taking a consistent approach to the treatment of de-energised Metering Systems in the data they report to National Grid. 

What do I need to do? 

The legal text for P402 Alternative Modification is clear that Billing Data reported to National Grid should exclude de-energised Metering Systems. It is important that DNOs and IDNOs comply with this BSC requirement in order to avoid overcharging of Suppliers responsible for de-energised sites. 

DNOs and IDNOs should verify that their IT solutions for provision of Billing Data to National Grid comply with this requirement (and, if not, take appropriate remedial action). 

If you have any concerns or questions about this issue, please contact [email protected]. 

To see the legal text, open the ‘Approved Alternative Legal Text document’ in the Final Modification Report zip folder on the P402 webpage. You can find this by clicking the ‘Report Phase’ tab. 

You can find the definition of ‘Billing Data’ in Annex X-1 of the BSC.


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