026 CVA Risk: Aggregation Rules


This page outlines the Risk that Aggregation Rules in CDCA are incorrect such that CVA Metered Data is not correctly aggregated and the energy volumes required for Settlement are incorrect or missing.

How it relates to you

Parties responsible for risk factors

  • Registrant
  • Licensed Distribution System Operator

Parties responsible for risk controls

  • Licensed Distribution System Operator
  • Non-Performance Assurance Parties

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.

  • Registrant creates Aggregation Rule incorrectly, including incorrect or missing LLFs
  • CDCA manually inputting Aggregation Rules incorrectly
  • Changes on site not reflected in Aggregation Rule

Potential solutions

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

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

Impact of this risk on the industry

  • Impact: £107.4K
  • Upper Impact: £39.8Million
  • Volatility: High

In order to calculate the impact this risk has on your Party, multiply your market share by the impact as outlined above.

Further information

Risk Evaluation Register sets out further detailed information on the noted controls. Details can be found under Associated Documents. 

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 documents outline the methodology used to assess the Settlement Risk related to Agent appointments.


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