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Non-revenue loss prevention is an important priority for utility companies seeking to protect income, improve operational efficiency and safeguard critical infrastructure. From water meters and gas installations to electricity metering equipment and distribution assets, unauthorised access, inaccurate measurement, leakage and equipment interference can all contribute to avoidable losses.
For utility operators, reducing these losses requires more than monitoring consumption. Effective prevention combines accurate metering, regular inspections, data analysis, secure access procedures and reliable tamper-evident security seals.
Acme Seals Ltd supplies security seals designed to help organisations protect meters, equipment and other valuable assets. By incorporating the right sealing products into a wider loss-prevention programme, utilities can strengthen inspection procedures, improve traceability and identify potential interference more quickly.
In this guide, we explain what non-revenue losses are, why they matter, how organisations can reduce them and how security seals can support a more effective utility asset protection strategy.
Non-revenue loss prevention refers to the processes, technologies and physical security measures used to reduce losses that prevent an organisation from receiving the revenue it should earn or recovering the value of resources it supplies.
In the utilities sector, the term can cover several different problems, depending on the service being provided.
For water companies, non-revenue water generally refers to water that enters the distribution system but is not ultimately billed. Causes can include physical leakage, metering inaccuracies, unauthorised consumption and weaknesses in customer or billing records.
For electricity and gas providers, non-technical losses can include energy consumed but not correctly measured or billed, including losses associated with meter tampering, illegal connections, inaccurate records or billing errors.
These categories are related, but they are not identical. Physical water leakage, for example, is different from electricity theft, and each requires its own detection and prevention methods.
The common objective is to reduce avoidable losses, improve accountability and protect the integrity of the utility network.
Uncontrolled losses can affect financial performance, operational planning, customer confidence and the efficient use of resources.
A strong loss-prevention strategy can help organisations to:
The financial impact varies considerably between organisations. The best starting point is to establish a reliable baseline, identify the largest sources of loss and measure the results of targeted improvements.
Water leakage demonstrates why loss prevention matters. According to Ofwat, in 2024–25 water leakage in England and Wales averaged 46.4 litres per person per day. Ofwat reported a figure of approximately 80 litres per person per day for Scotland and Northern Ireland.
These figures relate to leakage rather than the full definition of non-revenue water. They nevertheless illustrate the importance of accurate monitoring, effective maintenance and practical measures to reduce avoidable resource losses.
Source: Ofwat — Leakage.
Before selecting prevention measures, utility operators need to understand the different ways losses occur.
Interference with metering equipment can compromise measurement, create safety risks or make it harder to establish whether an installation has been accessed without authorisation.
Possible warning signs include a missing security seal, a damaged seal, a discrepancy in recorded seal numbers or evidence that an enclosure has been opened.
A tamper-evident security seal provides a visible indication that a protected point may have been disturbed. It does not prove theft or establish who was responsible, but it gives inspection teams a useful reason to investigate.
Water can be lost through leaking pipes, damaged fittings, faulty valves and other defects in the distribution network.
These are physical losses, not necessarily evidence of theft or tampering. They are best addressed through leakage detection, pressure management, maintenance and targeted repairs.
Security seals can complement these controls by helping operators identify unauthorised access to selected meters, valves or inspection points.
Revenue can also be affected by faulty meters, incorrect readings, incomplete customer records, data-transfer problems and billing errors.
These problems require suitable testing, data validation, record reconciliation and corrective action. Security seals cannot resolve inaccurate measurement or administrative errors, but they can support the integrity of equipment between authorised inspections.
Where seals are not recorded consistently, staff may struggle to distinguish routine maintenance from unexplained interference.
Common weaknesses include missing seal numbers, inconsistent inspection records, unclear responsibility for replacements and poor stock control.
A standardised sealing process makes these weaknesses easier to address.
Utility assets may be accessed by employees, contractors, maintenance engineers and inspection teams. Without clear procedures, organisations can lose track of which assets have been opened, inspected or resealed.
Documented authorisation, recorded seal numbers and signed-off inspection work help create a clearer chain of accountability.
Security seals are a practical part of physical asset protection. When correctly selected and applied, they help indicate whether a secured point may have been opened or interfered with.
They are particularly useful where utility companies need an economical way to secure a large number of assets across geographically dispersed sites.
A suitable meter seal can secure an appropriate sealing point on a meter, terminal cover or associated enclosure, subject to the equipment manufacturer’s instructions and the utility operator’s procedures.
The seal should be selected according to the installation, environmental conditions, required identification and applicable technical requirements.
Sequentially numbered seals are especially useful because each seal has a unique identifier that can be recorded against the relevant asset.
During an inspection, an engineer can compare the installed seal number with the number held in the asset record. A mismatch, missing seal or sign of damage can trigger further investigation.
Explore Acme Seals’ security seals for meters for options intended for metering and utility applications.
Numbered security seals help organisations link a physical security device to an asset record.
For example, a utility operator may record:
This information can help supervisors identify discrepancies, investigate incidents and review recurring issues across the network.
Where supported by the organisation’s systems, the process can be strengthened through barcode scanning, QR codes, photographs and digital work orders.
Not every application requires the same seal. A small meter enclosure and a high-security freight container present different risks.
For routine meter and asset identification, an appropriate pull-tight seal may be suitable. For other applications, a fixed-length, wire or cable sealing solution may be more appropriate.
Selection should consider the sealing point, available clearance, required strength, exposure to weather, inspection frequency and the consequences of unauthorised access.
For international freight containers, ISO 17712:2013 establishes requirements for the classification and acceptance of mechanical freight container seals. It should not be treated as a universal certification requirement for ordinary utility meter seals.
Read the ISO 17712 standard overview for details of its scope.
Security products work best when they form part of a consistent operating procedure. The following measures provide a practical starting point for utility companies and other asset-intensive organisations.
Create an asset register and assess which installations are most vulnerable to unauthorised access, measurement interference or operational disruption.
Prioritise assets according to factors such as historical incidents, accessibility, consumption value, location, inspection results and the consequences of failure.
This allows resources to be directed towards the locations where additional controls are most likely to deliver value.
Define which assets require seals, which seal types are approved, who may apply or remove them and how each action must be recorded.
A standard procedure should explain how to inspect an installed seal, report suspected interference, replace a seal following authorised work and escalate discrepancies.
Staff and contractors should receive appropriate training before the procedure is introduced.
Use a centralised record to connect each seal to the relevant asset.
At every inspection, confirm that the installed seal is present, legible and consistent with the recorded identifier. Document any discrepancy and follow the established escalation process.
Photographs can provide useful supporting evidence, particularly when a seal is damaged or the condition of an installation is disputed.
Review meter readings, consumption patterns, inspection findings and reported incidents together.
Unexpected changes in consumption may indicate leakage, equipment failure, a reading problem or another issue that requires investigation. They should not automatically be treated as evidence of fraud.
By combining operational data with physical inspection results, organisations can prioritise investigations more effectively.
Establish a baseline before introducing new controls. Monitor indicators such as:
Review the results regularly and adjust the programme where the evidence indicates a need for improvement.
Consider a hypothetical utility operator responsible for thousands of meters across residential and commercial locations.
During routine inspections, the operator discovers that some installations have missing seals, while others have seal numbers that do not match the asset records. The reasons are not immediately clear: some discrepancies may relate to legitimate maintenance, while others may require further investigation.
The operator introduces a standardised sealing programme.
First, it identifies the assets requiring additional protection. It then selects suitable tamper-evident seals, introduces a process for recording unique seal numbers and requires engineers to document seal condition during each visit.
When a seal is replaced, the engineer records the original identifier where available, the reason for replacement and the new seal number. Supervisors review exceptions and investigate unexplained discrepancies.
Over time, the operator can compare inspection results, improve record quality and identify recurring weaknesses in access control.
The value of the programme is not simply the seal itself. It is the combination of a visible tamper-evident control, consistent application, reliable records and a clear process for responding to anomalies.
This is an illustrative example, not a claim of measured savings from a particular utility customer.
An effective non-revenue loss-prevention programme should combine physical security, operational procedures and evidence-based decision-making.
The following practices can help organisations establish a more consistent approach.
Risk-based asset protection: Select controls according to the application and level of risk rather than applying the same solution indiscriminately.
Suitable product selection: Check that the seal is compatible with the equipment and approved sealing point. Consider durability, identification requirements, environmental exposure and the ease of inspection.
Traceable identification: Use unique seal numbers and maintain accurate records of application, inspection, removal and replacement.
Controlled access: Define who is authorised to access equipment and ensure maintenance activity is recorded.
Clear incident escalation: Treat damaged, missing or mismatched seals as potential anomalies requiring assessment, not automatic proof of wrongdoing.
Regular audits: Review stock control, field procedures, asset records and inspection quality to identify gaps.
Integrated monitoring: Combine sealing procedures with appropriate meter testing, leakage detection, consumption analysis and maintenance programmes.
Continuous improvement: Monitor performance, investigate recurring issues and update procedures when operational evidence justifies a change.
For organisations operating across several sites, documented procedures also make it easier to maintain consistent standards between teams, contractors and locations.
The most suitable security seal depends on the asset, application and risk being addressed.
When evaluating products, consider the following questions:
Acme Seals supplies a range of tamper-evident security products, including pull-tight seals, fixed-length seals, metal seals and other options for different applications.
Explore the pull-tight plastic security seal range to review options for suitable applications. For meter installations, start with the dedicated security seals for meters page.
The right choice should be based on the installation and operational requirements rather than price or appearance alone.
Non-revenue loss prevention is the use of operational, technical and security controls to reduce resources or services supplied without the expected revenue being recorded or collected. In utilities, this can include addressing leakage, unauthorised consumption, metering inaccuracies and billing errors.
Non-revenue water can result from physical leakage, metering inaccuracies, unauthorised consumption and weaknesses in customer or billing records. The exact causes vary between water networks and should be assessed using reliable operational data.
Security seals provide tamper-evident protection for suitable meters, enclosures and other assets. Missing, damaged or mismatched seals can alert inspectors to possible interference and prompt further investigation.
Suitable tamper-evident seals can help deter unauthorised access and indicate possible interference. They cannot guarantee that tampering will not occur, and they should be used alongside approved installation procedures, inspections and other security controls.
The correct seal depends on the meter design, sealing point, required identification, environmental conditions and applicable procedures. Pull-tight seals, wire seals and other specialist products may be appropriate for different applications.
Yes. Unique seal numbers can be recorded against individual assets and checked during inspections. This helps identify mismatches and creates a clearer record of seal replacement and authorised access.
Useful measures include changes in confirmed losses, inspection discrepancies, record completeness, leakage levels where applicable, investigation times and the cost of corrective action. Results should be compared with a reliable baseline.
No. Security seals are one component of a wider strategy. Effective loss prevention may also require accurate meters, leak detection, data analysis, maintenance, access controls, staff training and reliable billing processes.
Non-revenue loss prevention requires a joined-up approach to asset security, accurate measurement, inspection and operational control. Utility companies need to understand where losses occur, identify the assets most at risk and introduce practical measures that can be monitored and improved over time.
Tamper-evident security seals can play an important role by helping protect suitable meters and equipment, highlighting potential interference and supporting reliable inspection records. When combined with appropriate technical controls and clear operating procedures, they help strengthen accountability across utility operations.
Acme Seals Ltd provides security sealing solutions for organisations looking to improve asset protection and traceability. Whether you need seals for utility meters, cabinets, equipment or other applications, choosing the right product is an important step towards a more consistent loss-prevention programme.
Protect your assets with Acme Seals Ltd. Explore our security seals for meters or visit Acme Seals to discover our product range. For help selecting a suitable sealing solution, call 01376 521841 or email [email protected].