Technical Assurance of Metering Systems

This page explains how Technical Assurance of Metering technique is designed to monitor compliance with metering requirements and forms part of the Performance Assurance Framework .

How it relates to you

To check the compliance of Metering Systems, the Technical Assurance Agent (TAA) has to perform an annual audit made up of individual inspection visits.

The audit consists of a combination of sampled and targeted Inspection Visits to sites with Half Hourly Metering Systems registered in Supplier Volume Allocation (SVA) and Central Volume Allocation (CVA).

The TAA is a BSC Agent commissioned and managed by ELEXON. The TAA is currently C&C Group Ltd.

The TAA will notify the relevant Registrant and the appointed agents of the scheduled inspection visit. The TAA auditors are suitably qualified, trained and experienced to carry out the inspection visits and have the appropriate authorisation throughout Great Britain.

All TAA auditors carry copies of their authorisations to inspection visits

The Registrant is responsible for securing access to the site and Metering System which has been selected for audit and should ensure that a suitably qualified Meter Operator Agent can attend.

For High Voltage (HV) sites and for Low Voltage (LV) sites with remote Current Transformers (CTs), the Registrant will also need to ensure that a Licensed Distribution System Operator (LDSO) engineer can attend.

Planning for an Inspection Visit

ELEXON has developed an online support tool to help organise site visits and share information with the TAA. The Technical Assurance Agent Management Tool (TAAMT) is a central database that contains all historical data and information for Metering System visits performed by TAA inspectors.

Use TAAMT to view inspection schedules, results, submit data and communicate with the TAA.

If you want to use this system please contact the TAA Helpdesk to arrange an account. The TAA Helpdesk is available during business hours to answer questions and help with data submissions.

What happens after the Inspection Visit?

After the Inspection Visit the TAA will show you the results and also share these with the associated agents responsible for the Metering System.

You are required to rectify any non-compliance the TAA has found.

The TAA publishes an Annual Report each year providing a summary of its findings. The Annual Report is presented to the BSC Panel in June each year.

TAA Annual Report

The TAA Annual Report provides the Technical Assurance Agent’s view on the health of the Half Hourly metering population in the SVA and CVA markets. It is based on the findings from the inspection visits and is used to highlight key market issues, particularly those with high potential for materiality or risk to the quality of data used in Settlement.

The TAA’s report is divided into two parts:

  • Non–compliance statistics report
  • Commentary on the statistics

If you have had more than 25 TAA inspections during the audit period, you will receive your individual annual customer reports, and will also be offered a chance to discuss your individual findings with ELEXON and the TAA.

We also produce individual confidential reports for Registrants (of Metering Systems) and Meter Operator Agents who receive 25 or more visits during the year.


The size and scope of the sample is set by the Performance Assurance Board (PAB) within the Risk Operating Plan (ROP).

For the audit year 2018/19, the PAB approved a 1% representative sample size for the SVA Metering System population and a 5% representative sample size for the CVA Metering System population.

Technique within Performance Assurance process

Technical Assurance of Metering is a detective technique in ELEXON’s Performance Assurance Framework. It provides a level of assurance that the metered values passed into Settlement represent actual consumption.

BSC obligations

ELEXON monitor the compliance of Metering Systems with the requirements stated in the BSC and Metering Codes of Practice (CoP).


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