Maintenance of energy transmission and distribution networks: how to structure reliable maintenance to ensure continuity of service?

Energy transmission and distribution networks rely on extensive infrastructures that operate continuously, and any failure directly affects service continuity. Structuring maintenance makes it possible to anticipate incidents, organise interventions and manage the reliability of assets in a highly constrained environment.

 

How to identify and prioritise critical assets in energy networks?

The long-term operation of a transmission or distribution network depends on the availability of certain assets whose failure has a direct impact on service continuity. Criticality analysis consists of determining which assets contribute most to the network’s performance and safety, so maintenance efforts and available resources can be focused on them.

Which assets have the greatest impact on service continuity?

In transmission or distribution power grids, some assets stand out for their contribution to energy delivery and network stability:

• Transformation and distribution substations: they adjust voltage levels and redistribute power to consumption areas. Their unavailability can leave entire zones without energy.
• Overhead lines and underground cables: these are the physical structures that carry energy. Their vast extent (hundreds of thousands of kilometres) exposes the network to mechanical, weather-related and wear risks.
• Pressure and regulation stations: these assets control essential electrical parameters (voltage, flow), determining the quality of service delivered to end users.
• Protection and remote-control equipment: essential for detecting and isolating faults, they help prevent incident propagation and ease recovery after disruptions.

This characterisation is not limited to a functional description of assets: it also relies on a rigorous analysis of the potential impact of a failure on the overall network, measured in terms of customer interruptions, repair costs and safety effects.

How to define criticality levels suited to networks?

Defining criticality levels requires an objective assessment of failure consequences:

• Impact on service continuity: assets whose failure causes wide or prolonged outages should be classified as high criticality.
• Historical failure frequency: some components have known wear or failure patterns, justifying increased attention.
• Repair effort and redundancy: difficult access, long intervention times and lack of backup systems increase an asset’s criticality.

Setting criticality levels typically combines technical data, field experience feedback and statistical analyses, enabling transparent and measurable prioritisation.

How does the CMMS provide a structured, prioritised view of assets?

The Computerized Maintenance Management System (CMMS) is a maintenance management tool particularly useful for structuring and visualising asset criticality:

• It centralises the asset inventory and classifies items according to criticality attributes defined by the maintenance manager.
• It integrates intervention histories, failure data and performance metrics, allowing objective comparisons between assets.
• It offers a hierarchical representation that is useful for planning, resource allocation and investment decisions.

A well-configured CMMS makes it easier to prioritise maintenance actions based on risk and impact, making the organisation more responsive and effective.

 

How to structure maintenance plans adapted to transmission and distribution networks?

Once assets are prioritised according to their criticality, the challenge for maintenance managers is to build intervention plans that support long-term network operation.

How to reconcile preventive maintenance and emergency interventions?

Preventive maintenance aims to reduce the likelihood of failure through periodic checks, targeted inspections and planned operations on assets identified as sensitive. It helps control technical risks while limiting unplanned interventions.

However, field realities require retaining emergency response capacity, especially during unforeseen incidents or extreme weather. Structuring maintenance plans therefore depends on a balanced approach between scheduled actions and managing exceptional events, to preserve service continuity without disrupting teams.

How to integrate continuous operation constraints?

Energy networks operate continuously and serve users with high availability expectations. Maintenance operations must therefore fit into intervention windows that are compatible with network operation.

This implies taking into account:

• lockout and electrical safety constraints,
• network switching or redundancy options,
• periods of lower demand,
• potential impacts on end users.

Scheduling interventions requires close coordination between maintenance and operations to minimise outages, reduce their duration and ensure controlled working conditions for field teams.

How does the CMMS facilitate multi-team planning and coordination?

The CMMS plays a structuring role in developing and tracking maintenance plans for energy networks. It helps turn a complex organisation into a coherent, manageable system.

With a CMMS, maintenance managers can:

 

• schedule preventive operations based on asset criticality and operational constraints,
• coordinate interventions between internal teams and external contractors,
• visualise workloads and adjust available resources,
• integrate emergencies without disrupting the entire schedule.

By centralising operational information and providing a shared view of upcoming interventions, the CMMS helps make network maintenance more reliable while improving responsiveness to unforeseen events and the overall quality of service delivered.

 

How to reduce breakdowns and incidents through proactive maintenance?

After structuring asset criticality and organising maintenance plans, the next challenge for maintenance managers is to concretely reduce breakdowns and incidents across the network.

What are the main causes of failures on networks?

Incidents on energy networks rarely stem from a single factor. They usually result from a combination of technical, environmental and organisational causes: ageing infrastructures, environmental constraints, overloads and changing usage patterns, undetected defects, etc.

Identifying these causes allows moving beyond a purely corrective approach towards maintenance focused on prevention and risk control.

How to leverage incident and intervention histories?

Energy networks generate large volumes of data from field interventions, incident reports and scheduled maintenance. When structured and analysed, this information becomes a powerful anticipation lever.

Analysing histories makes it possible to:

• detect assets prone to repeated failures,
• identify failure patterns linked to specific conditions (seasonality, geographic areas, asset types),
• adjust the frequency and type of preventive maintenance activities,
• improve intervention procedures by capitalising on past experience.

This analysis turns past events into operational lessons, strengthening the network’s long-term reliability.

How does the CMMS help prevent recurring breakdowns?

The CMMS provides a framework to effectively exploit field data. It consolidates all incident, inspection and intervention histories into a single reference.

In practice, the CMMS helps prevent failures by:

• consolidating intervention data by asset, area or asset type,
• facilitating the analysis of failure frequencies and repair times,
• triggering targeted preventive actions based on thresholds or observed indicators,
• helping identify root causes of recurring incidents.

Relying on a factual and continuous view of network condition, maintenance becomes part of a progressive improvement process for asset reliability and availability.

 

How to manage maintenance performance for energy networks?

Maintenance managers need an objective view of performance to arbitrate, anticipate and sustainably improve network reliability.

Which key indicators should maintenance managers track?

Managing maintenance for transmission and distribution networks is based on a set of technical indicators directly related to service continuity:

• MTBF (Mean Time Between Failures): measures asset reliability by evaluating the average time between failures. A declining MTBF for an asset type signals a need to adjust maintenance strategies.
• MTTR (Mean Time To Repair): reflects teams’ ability to restore service quickly after an incident. It depends as much on organisation as on asset accessibility and resource availability.
• Availability rate: a synthetic indicator that measures the network’s ability to fulfil its mission over time.
• Response times: indicate operational responsiveness, particularly for incidents affecting users.

These indicators are most valuable when tracked over time and considered alongside the criticality of the assets concerned.

How does the CMMS turn field data into decision-making dashboards?

The CMMS plays a structuring role in performance management. It aggregates data from interventions, incidents and preventive plans and presents them as actionable dashboards.

It enables, in particular:

• monitoring performance indicators in real time or over defined periods,
• cross-referencing technical data with geographic zones or criticality levels,
• rapidly identifying deviations or improvement areas,
• supporting strategic decisions with measurable, shared elements.

By making performance visible and understandable, the CMMS becomes a decision-support tool for more controlled, results-oriented maintenance.

How to secure interventions and ensure traceability on energy networks?

Maintenance of transmission and distribution networks exposes teams to high risks due to the nature of the infrastructures and the operational constraints. Safety and traceability directly contribute to service quality and reliability.

Ensuring field team safety

Interventions on energy networks require strict lockout, control and coordination procedures. Formalising these elements helps protect teams while streamlining field operations.

Meeting regulatory requirements and audits

Network operators face strong regulatory obligations regarding safety, maintenance and service continuity. Internal and external audits require the ability to demonstrate, with evidence, that operations were carried out in accordance with applicable rules.

 

How does the CMMS ensure traceability of interventions and controls?

The CMMS addresses traceability and compliance challenges. It records all operations performed on network assets, from planning through to intervention feedback.

Concretely, it:

• keeps detailed histories of interventions, inspections and checks,
• associates each action with an asset, a date and an intervener,
• facilitates report generation for audits and authorities,
• secures information by making it accessible and verifiable.

This traceability strengthens risk control, improves operational transparency and helps professionalise network maintenance organisation.

 

How does the CMMS become a lever to improve reliability for energy transmission and distribution maintenance?

Maintenance of transmission and distribution networks must anticipate failures, manage performance and secure operations to ensure long-term service continuity.

The CMMS is a necessary tool in this approach, linking field data to strategic decisions. It supports network operators in progressively improving their infrastructures’ reliability and sustainably controlling service quality.