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Material Error Monitoring


Material Error Monitoring is designed to:

  • Estimate the impact and materiality of a Settlement Error;
  • Monitor error levels over time; and
  • Estimate the contribution to overall market errors made by individual Parties and their Agents.

The process also helps us rank customer performance in the market and identify operational issues.

Why is it used?

Material Error Monitoring provides assurance to Panel committees and other market participants that a Performance Assurance Party’s contribution to the error is quantified and the impact of such errors is established. This technique complements the BSC Audit, Technical Assurance, Error and Failure Resolution and Trading Disputes processes.

The PAB has a set of reporting requirements used to monitor materiality.

How does the process work?

We use the Material Error Monitoring process to analyse settlement data and supplementary data to estimate and track identified material errors. We can model and communicate the impact of identified settlement errors to the Performance Assurance Board and/or Trading Disputes Committee to help them make decisions. It also enables us to provide estimated error contribution to customers confidentially so they can monitor their progress in resolving errors.

What are the big issues at the moment?

Issues we’re currently monitoring include:

  • Erroneous Large Estimated Annual Consumption (EAC)/Annualised Advances (AAs);
  • Unmetered Supplies (UMS); and
  • Incorrect Energisation Status.
  • Additional Information

For more information see below:

Erroneous Large EAC/AAs

Our EAC/AA training video explains the management and resolution of Erroneous Estimated Annual Consumption (EACs) and Annualised Advances (AAs); its impact on the market, monitoring, reporting, and the actions to address it. He also covers how the Trading Disputes process is used to correct errors in Settlement.

Click on the image below to view the video – best viewed in IE9 and above, Firefox and Safari.

Erroneous Large EAC/AA Annual Billed Unit Guidance
Issued On: 7-November-2013

2017 Erroneously Large EAC AA Reporting Calendar
Issued On: 29-November-2016

Management and Resolution of Large EAC/AAs
Issued On: 1-March-2017

NHH Meter Reading Validation Algorithm [305 Kb]
Issued On: 7-November-2013

Work shop notes: 22 September 2011 [182 Kb]
Issued On: 24-November-2011

Large EAC/AA Forum Minutes – March 2012

Large EAC/AA Forum Minutes – April 2013

Incorrect NHH Energisation Status & Unmetered Supplies

ELEXON Monitoring of Incorrect NHH Energisation Status [290 Kb]
Issued On: 07-November-2013

Energisation Status Monitoring Calendar 2016-2017

Issued On: 10-February-2016

Energisation Status Monitoring Calendar 2017-2018

Issued On: 5-December-2016

UMS Monitoring Timetable 2017-2018
Issued On: 8-March-2017

Unmetered Supplies Monitoring Guidance [156 Kb]
Issued On: 7-November-2013

Performance Assurance Framework

Material Error Monitoring is a detective technique in ELEXON’s Performance Assurance Framework.