1. Introduction

Asset condition monitoring refers to the systematic inspection, testing, assessment, recording and evaluation of physical infrastructure to determine its present condition, deterioration rate, remaining useful life and risk of failure. In the energy sector, this includes transformers, substations, transmission towers, conductors, underground cables, poles, switchgear, pipelines, generating equipment, civil structures, batteries and other critical infrastructure.

The legal duty to monitor asset condition generally arises from a combination of statutory duties, licence conditions, safety regulations, regulatory standards, contractual obligations and the common law duty of care. The obligation is not necessarily limited to repairing an asset after failure. In appropriate circumstances, the law requires an operator to identify deterioration beforehand and take reasonably necessary preventive action.

This principle is particularly important for electricity networks because failure of poorly maintained infrastructure can cause electrocution, fires, outages, property damage, environmental harm and disruption of essential services.

2. Nature of the Legal Duty

A condition-monitoring obligation normally involves five connected duties:

Inspection – identifying defects and deterioration.

Monitoring – periodically or continuously assessing asset condition.

Record-keeping – maintaining reliable information about asset health and maintenance history.

Risk assessment – determining the consequences and probability of failure.

Remedial action – repairing, replacing, isolating or retiring assets where risks become unacceptable.

Thus, a utility cannot necessarily argue that it had no knowledge of a dangerous condition if a reasonable inspection system should have revealed the deterioration.

The precise standard depends on the asset, statutory framework, risk, technical standards and circumstances.

3. Indian Legal Framework

A. Electricity Act, 2003

The Electricity Act, 2003 provides an important statutory foundation for asset safety. Section 53 authorises the Central Electricity Authority, in consultation with the State Government, to specify measures protecting the public and persons involved in generation, transmission, distribution and trading from dangers arising from electricity and from the installation, maintenance or use of electric lines and electrical plant. It also provides for measures concerning electrical plant and action necessary to eliminate or reduce risks of injury or property damage. (India Code)

Consequently, asset condition monitoring is not merely an engineering-management question. Where monitoring is necessary to discharge statutory safety obligations, failure to undertake appropriate monitoring can have legal consequences.

B. Central Electricity Authority safety regulations

The statutory framework is supplemented by technical safety requirements made under the Electricity Act. These requirements establish the broader principle that electrical installations and networks must be operated in a manner that protects persons and property.

For an operator, this means that condition monitoring should be connected to the actual safety risks of the equipment rather than being treated as an administrative exercise.

C. Electricity supply and distribution obligations

Distribution licensees also have continuing responsibilities relating to their network assets. The Electricity Act provides for regulatory control over electricity supply and the maintenance and operation of electrical lines, plant and meters. (India Code)

Accordingly, a distribution company should generally have procedures for:

identifying deteriorating equipment;

inspecting overhead lines;

testing transformers and switchgear;

monitoring substations;

maintaining protection systems;

identifying overloaded or defective equipment;

recording defects;

prioritising high-risk assets; and

implementing corrective measures.

4. Judicial Recognition in India

A. Municipal Corporation of Delhi v. Subhagwanti, AIR 1966 SC 1750

This is one of the most relevant Indian Supreme Court authorities for the principle of periodic inspection of ageing infrastructure.

The case concerned the collapse of an old Clock Tower belonging to the Municipal Corporation of Delhi. The structure was approximately 80 years old, while evidence indicated that its expected safe life was substantially shorter.

The Supreme Court held that once a structure had passed its normal expected life, there was a duty to conduct careful and periodic inspection to determine whether deterioration had occurred and whether strengthening or other precautions were necessary. The Court rejected the suggestion that the absence of obvious defects necessarily absolved the owner of responsibility. (Juris Codex)

Legal significance

The principle is highly relevant to energy infrastructure.

For example, where a transformer, transmission tower, substation structure or other critical asset is approaching the end of its expected service life, an operator may have to increase inspection and assessment rather than simply continue operating the asset until failure.

The case therefore supports the proposition that:

Age and known deterioration can increase the intensity of the inspection duty.

B. M.P. Electricity Board v. Shail Kumari, (2002) 2 SCC 162

This Supreme Court decision is particularly important for electricity infrastructure.

A person died after coming into contact with a live electric wire lying on a public road. The Electricity Board argued that the wire had become disconnected because of illegal tapping by a third party.

The Supreme Court nevertheless imposed liability on the electricity supplier. It emphasised that electricity is inherently dangerous and that those responsible for supplying it have an additional duty to take safety measures to prevent dangerous escape of electrical energy. The Court also held that the conduct of a third party did not necessarily constitute a defence where the consequences could reasonably have been anticipated or prevented. (Indian Kanoon)

Importance for condition monitoring

The case establishes an important preventive principle:

operators of dangerous electricity infrastructure have enhanced safety responsibilities;

foreseeable risks must be addressed;

the operator cannot simply blame an external event where appropriate protective measures could have prevented the harm.

Therefore, monitoring systems should identify foreseeable conditions such as:

damaged conductors;

defective poles;

inadequate clearances;

deteriorating insulators;

unsafe substations;

damaged protective equipment; and

conditions likely to cause an electrical fault.

5. United Kingdom: Explicit Asset-Management Regulation

The UK provides an especially clear regulatory example.

Under the electricity distribution licence framework, Network Asset Indices have included:

a Health Index, concerning the current condition of network assets and predicted deterioration;

a Criticality Index, concerning safety, environmental, reliability and financial consequences of failure; and

a Risk Index, combining asset condition and consequences of failure. (Ofgem)

This demonstrates a modern regulatory approach: asset management is not limited to asking whether equipment is currently functioning. Regulators also consider condition, deterioration, consequences and future failure risk.

Ofgem's regulatory framework also requires licensed energy companies to comply with licence conditions and allows Ofgem to monitor compliance and take enforcement action. (Ofgem)

6. National Grid – Harker Substation: A Direct Regulatory Example

A particularly important recent example is the National Grid Electricity Transmission Harker 132kV substation enforcement matter.

Ofgem investigated the condition of civil assets at the Harker substation, including structures such as concrete foundations and support structures. National Grid ultimately accepted historic failures involving inadequate monitoring, maintenance and repair of certain civil assets during November 2016–November 2021. (Ofgem)

The identified issues included deterioration such as spalling concrete and exposed steel reinforcement, together with shortcomings in the inspection and risk-assessment regime and inadequate planning of remedial works. (Ofgem)

Ofgem concluded that the failures engaged:

section 9(2) of the Electricity Act 1989, requiring development and maintenance of an efficient, coordinated and economical transmission system; and

Standard Licence Condition B7, concerning resources necessary to operate the transmission business properly and efficiently and comply with statutory and licence obligations. (Ofgem)

In March 2026, Ofgem reported that National Grid agreed to make £20 million to its Energy Industry Voluntary Redress Scheme in connection with the historic licence failures. (Ofgem)

Legal lesson

Harker is particularly significant because it demonstrates that asset condition monitoring itself can become a regulatory compliance issue.

The legal problem was not simply that a structure eventually became defective. The regulator examined whether the licensee had:

adequately monitored condition;

conducted sufficiently formal inspections;

assessed risk;

planned remedial work;

maintained appropriate resources; and

acted sufficiently early to prevent deterioration from becoming a wider operational problem.

7. Condition Monitoring and the Duty to Maintain

A useful distinction must be made between monitoring and maintenance.

Monitoring

Monitoring answers:

What condition is the asset in?

Maintenance

Maintenance answers:

What should be done about that condition?

The two duties are legally interconnected.

If a utility possesses information showing progressive deterioration but fails to act, its position can become substantially more difficult. Conversely, a sophisticated monitoring programme is of limited legal value if identified risks are routinely ignored.

Ofgem's earlier asset-risk-management guidance specifically examined whether network companies had systems for asset condition monitoring and recording, whether findings were current and comprehensive, whether information was systematically used, and whether maintenance information fed back into asset-risk decisions. (Ofgem)

8. Risk-Based Monitoring

Modern energy regulation increasingly moves away from a simple fixed maintenance schedule toward risk-based asset management.

The monitoring frequency for a new low-risk asset may differ from that for:

an ageing transformer;

a heavily loaded transmission line;

a corroded offshore structure;

a substation serving critical infrastructure;

equipment with known manufacturing defects; or

an asset whose failure could cause widespread interruption.

A rational legal compliance system therefore considers:

Condition × Probability of Failure × Consequence of Failure = Asset Risk

This approach helps establish defensible priorities for inspection, repair and replacement.

9. Duty to Keep Accurate Asset Records

Condition monitoring also creates an important information-management obligation.

A utility should normally maintain records concerning:

installation date;

manufacturer and model;

operating history;

inspections;

testing results;

defects;

repairs;

replacement components;

maintenance intervals;

failures;

risk assessments;

condition scores; and

decisions to defer or undertake remedial work.

The importance of reliable regulatory data is increasingly recognised by Ofgem. Its 2026 Data Assurance Guidance covers data-assurance requirements for electricity and gas network licensees and emphasises that licence holders must keep up to date with applicable requirements. (Ofgem)

Poor records can therefore create a second problem: not only may the asset be inadequately monitored, but the operator may also be unable to demonstrate that it complied with its legal obligations.

10. Consequences of Failure to Monitor

Failure to undertake appropriate condition monitoring may generate several forms of legal exposure.

1. Regulatory enforcement

A regulator may investigate breach of:

licence conditions;

safety regulations;

statutory duties;

reporting requirements; or

asset-management requirements.

2. Civil liability

Where an infrastructure failure injures a person or damages property, the owner/operator may face:

negligence claims;

statutory compensation;

nuisance claims;

occupiers' liability;

strict liability principles in appropriate circumstances.

3. Administrative consequences

Regulators may impose:

compliance directions;

enforcement undertakings;

financial redress;

additional reporting requirements;

corrective-action programmes; or

licence-related consequences.

4. Evidentiary consequences

Maintenance and inspection records can become critical evidence in litigation or regulatory investigations.

An absence of records may make it difficult for an operator to demonstrate that reasonable inspection procedures existed and were actually followed.

11. Relationship with Negligence

The traditional negligence analysis asks whether the defendant owed a duty of care, breached the applicable standard, caused the damage and whether the damage was legally recoverable.

For infrastructure owners, the relevant question may therefore be:

Would a reasonably competent operator, having regard to the nature, age, condition and risk of the asset, have carried out the inspection or monitoring that was omitted?

The answer depends on circumstances.

An operator is not necessarily an insurer against every infrastructure failure. Equipment can fail unexpectedly despite appropriate inspection and maintenance.

However, where deterioration is reasonably detectable and the operator has failed to establish an appropriate inspection regime, liability becomes considerably more plausible.

12. Preventive Rather Than Reactive Responsibility

A central feature of asset-condition law is the movement from reactive maintenance to preventive asset management.

Reactive model

Failure → investigation → repair

Preventive model

Inspection → condition assessment → risk assessment → intervention → monitoring

The second model is increasingly important for critical electricity infrastructure.

The Harker matter illustrates this regulatory philosophy: Ofgem treated inadequate monitoring, maintenance and repair of deteriorating assets as relevant to the licensee's statutory and licence obligations, rather than waiting for complete structural failure before considering compliance. (Ofgem)

13. Relevance to Renewable and Modern Energy Infrastructure

The duty is increasingly important as electricity systems become more technologically complex.

Condition monitoring may be required for:

battery energy-storage systems;

offshore wind foundations;

solar generation equipment;

hydrogen infrastructure;

smart-grid equipment;

digital substations;

power electronics;

electric-vehicle charging infrastructure;

distributed energy resources;

interconnectors; and

ageing conventional generation assets.

New technology can create new monitoring obligations because conventional inspection methods may not adequately detect digital, thermal, chemical or cyber-physical deterioration.

14. Key Case-Law Principles

15. Conclusion

Legal duties regarding asset condition monitoring represent a preventive dimension of energy law. The responsibility of a utility is not necessarily satisfied merely by repairing equipment after it fails. Where infrastructure is dangerous, ageing, critical or subject to foreseeable deterioration, the operator may be required to establish appropriate systems for inspection, condition assessment, risk evaluation, record-keeping and timely intervention.

Indian jurisprudence, particularly Municipal Corporation of Delhi v. Subhagwanti and M.P. Electricity Board v. Shail Kumari, demonstrates the importance of preventive inspection and enhanced responsibility for dangerous infrastructure. (Juris Codex)

Contemporary UK regulation provides an even more explicit asset-risk framework through health, criticality and risk indices. The Harker substation enforcement matter shows how failure to adequately monitor and respond to deteriorating infrastructure can develop into a regulatory compliance issue, including significant financial redress. (Ofgem)

Ultimately, the legal principle can be expressed as:

Asset ownership → condition monitoring → risk identification → timely intervention → safe and reliable operation.

Where an operator fails at the monitoring stage despite a foreseeable need for inspection, that failure can become the foundation for regulatory enforcement, civil liability and questions concerning the operator's compliance with its statutory and licence obligations.