011 SVA Risk: Unmetered Supplies volumes calculated incorrectly


This page outlines the risk that Unmetered Supplies volumes are calculated incorrectly or not at all.

Diagram of 011 SVA Risk: Unmetered Supplies volumes calculated incorrectly
Diagram of 011 SVA Risk: Unmetered Supplies volumes calculated incorrectly

How it relates to you

Risk 011 impacts all meters in the SVA Market.

Parties responsible for risk factors

  • Meter Administrator
  • Licenced Distribution System Operator (UMSO)
  • non-Performance Assurance Parties

Parties responsible for controls

  • Meter Administrator
  • Supplier
  • Licenced Distribution System Operator
  • non-Performance Assurance Parties

Risk 011 forms part of the unmetered supply process shown in the Risk Visualisation Tool.

Potential Causes

Potential causes, or as they known in the Risk Evaluation Register: Risk Factors are the points of failure that could result in erroneous or estimated data entering Settlement.

Elexon has identified a number of typical failure points related to this risk, parties should note the list is non-exhaustive, and not all risk factors are applicable to every role type.

  • Unmetered Supplies Operator does not process inventories received from customers or does not provide UMS certificates to other parties
  • Incorrect Charge Codes or Switch Regimes used by MA/UMSO
  • Energisation status of UMS is incorrect
  • MA does not operate Central Management System (CMS) correctly and produces inaccurate HH advances (e.g. electric vehicles, smart lighting)
  • UMSO incorrectly calculates the EAC including using incorrect standing data
  • UMSO or MA does not provide new / updated EAC or HH advance to Data Collector
  • MA is not appointed or does not receive required information on Change of MA
  • PECU array not maintained by UMSO (e.g does not replace broken units or update the array with new lux levels)
  • MA does not transfer accurate volumes to the HHDC completely, or at all
  • Inventories do not accurately contain installed Metering Equipment

Potential Solutions

Parties responsible for operating controls should take note of the information below. This identifies the BSC Sections and Procedures relating the risk.

Parties should understand their responsibilities in relation to this risk. Parties responsibilities performance levels, Supplier Charges, and Rules are outlines in BSC section S, including Annex-1 & Annex-2. 

Review the processes outlined in the following BSCPs and ensure that internal processes match the requirements:

Impact of this risk on the industry

This graph highlights the probability distribution of this risk and cost incurred to the industry when a risk manifests over the course of a year.

  • Impact: £17.6 Million
  • Upper impact: £30.4 Million
  • Volatility: Medium

In order for you (a party) to calculate the impact this risk has on your party, please multiply your market share by the impact as outlined above.

Probability graph

Further information

Risk Evaluation Register sets out further detailed information on the noted controls.

Support and training

Operational Support Managers (OSMs) are able to help with further information or training on this risk and associated processes.

Methodology used for this risk

The following document outlines the methodology used to assess the Settlement Risk related to the retrieval of metered data.


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