What is E-HAZOP? An in-depth guide to electrical risk analysis
Utilities
Electrical installations in industrial environments bring specific safety challenges. Traditional HAZOP methods focus on process safety but fall short for complex high-voltage systems. That is why E-HAZOP was developed: a structured method for systematically identifying and controlling electrical risks. This approach is essential for projects such as high-voltage substations, battery energy storage (BESS) and other critical infrastructure.
What is E-HAZOP?
E-HAZOP stands for Electrical Hazard and Operability Study. It is a formal framework for analysing electrical installations with the aim of:
- Identifying hazards to personnel and the environment.
Assessing the design and operability of the system. - Minimising risks through recommendations for design, procedures and training.
- The method is semi-quantitative: risks are assessed on the basis of likelihood and consequence, and classified using a risk matrix (for example the ALARP principle).
Why is E-HAZOP needed?
Electrical systems differ fundamentally from process installations:
- High-voltage components (33 kV to 150 kV) bring risks such as electrocution, arc flashes and explosions.
- Complex interactions between transformers, switchgear and protection logic can lead to black-outs or dangerous situations.
- The human factor: operator errors during switching operations or emergencies can have serious consequences.
E-HAZOP offers a structured way to identify and mitigate these risks at an early stage.
The three pillars of E-HAZOP:
The method consists of three complementary sub-studies:
- SAFAN – Safety Analysis
Analysis of physical hazards in the installation:- Electrocution through direct or indirect contact.
- Fire risk in battery containers or switch cabinets.
- Explosion hazard due to gas accumulation or mechanical stress.
- SYSOP – System Security & Operability Analysis
Assessment of system design and operational reliability:- Does the protection logic work correctly in the event of faults?
- Are switchgear, transformers and protection systems reliable?
- How are redundancy and continuity of the energy supply guaranteed?
- OPTAN – Operator Task Analysis
Focus on human interaction:- Are procedures clear and workable?
- How do operators respond in emergencies?
- What training and tools are needed to prevent errors?
How does an E-HAZOP work?
- Multidisciplinary team: engineering, HSE, operations, maintenance.
Phases: from concept design to “frozen design”. - Working method: using guidewords and prompt words to systematically identify deviations and hazards.
- Risk assessment: inherent, current and residual risk are recorded and classified.
Benefits of E-HAZOP:
- Early risk control prevents costly redesigns.
- Compliance with legislation and internal safety standards.
- Better operational reliability and protection of personnel.
Conclusion:
E-HAZOP is the standard for electrical risk analysis in complex projects. It combines technical depth with practical recommendations and lays a solid foundation for safe, reliable energy infrastructure.
