SPECIALIST SECTOR

Offshore Electrical Engineer UK: Oil & Gas Platform Guide

Everything you need to know about offshore electrical engineering on UK oil and gas platforms — ATEX Zone 0, 1, and 2 classification, hazardous area equipment, essential services, ESD systems, BOSIET survival training, GWO certification, 2-week rotation patterns, and day rates of £400–£700.

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17 min readUpdated 2026-05-18Andrew Moore, Founder of Elec-Mate

Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.

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Key Takeaways

  • 1Offshore oil and gas platforms use ATEX zone classification (Zone 0, 1, and 2) to define areas where explosive atmospheres are likely. Every piece of electrical equipment in a hazardous zone must be rated for that zone and certified accordingly.
  • 2CompEx is the required qualification for offshore electrical engineers working in hazardous areas. Without CompEx certification, you cannot legally carry out electrical work in ATEX-classified zones on UK offshore installations.
  • 3Essential services — including emergency shutdown (ESD) systems, emergency lighting, fire and gas detection, and life-safety systems — have the highest electrical integrity requirements on any offshore installation.
  • 4BOSIET (Basic Offshore Safety Induction and Emergency Training) including HUET (Helicopter Underwater Escape Training) is mandatory before travelling to any offshore installation. Certificates expire after four years.
  • 5Typical offshore rotation is two weeks on, two weeks off, with accommodation, meals, and transport to the installation provided. Day rates for experienced offshore electrical engineers range from £400 to £700.
  • 6UPS systems on offshore installations are critical for maintaining power to essential services during main power interruptions. Offshore UPS maintenance requires understanding of both the UPS technology and the essential services it supports.
01 · Specialist Sector

Offshore Electrical Engineering in the UK

Offshore electrical engineering on UK oil and gas platforms represents one of the most technically demanding and financially rewarding specialisms in the electrical industry. The combination of hazardous area requirements, essential services engineering, confined working environments, and the consequences of failure in a remote offshore setting demands the highest levels of technical competence and professional discipline.

The UK Continental Shelf (UKCS) includes over 300 offshore installations — platforms, FPSOs (Floating Production Storage and Offloading vessels), and other facilities. The offshore wind sector adds a growing number of offshore substations and wind turbine installations. Together, these provide substantial and ongoing demand for competent offshore electrical engineers.

  • Regulatory framework — UK offshore electrical installations are governed by the Electricity at Work Regulations 1989 (EWR), the Offshore Installations (Prevention of Fire and Explosion, and Emergency Response) Regulations 1995 (PFEER), and industry standards including IEC 61892 (mobile and fixed offshore units) and IP15 (Area Classification Code for Installations Handling Flammable Fluids).
  • Duty holder responsibility — the duty holder (typically the operator of the installation) is responsible for ensuring all electrical work is carried out by competent persons. Competence for hazardous area work requires CompEx certification. All electrical work must be managed through a formal permit to work (PTW) system.
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02 · Specialist Sector

ATEX/IECEx Zone Classification on Offshore Installations

ATEX zone classification is fundamental to offshore electrical engineering. The entire process deck, wellhead areas, and associated equipment are typically classified as hazardous zones. Understanding zone classification is a prerequisite for any electrical work on an offshore installation.

  • Zone 0 — an explosive gas atmosphere is present continuously or for long periods. Zone 0 locations on an offshore platform typically include the interior of process vessels, storage tanks, and pipework carrying flammable hydrocarbons. Electrical equipment in Zone 0 must meet Category 1G certification (Ga equipment under EN/IEC 60079). Very little electrical equipment is installed in Zone 0 areas — instrumentation such as level gauges may be the only exceptions.
  • Zone 1 — an explosive atmosphere is likely to occur in normal operation. Zone 1 encompasses the process deck and areas immediately surrounding equipment that handles hydrocarbons under pressure — compressor areas, separator areas, flare booms, and pump areas. Equipment must be Category 2G (Gb) or better. Zone 1 is where the majority of offshore electrical equipment — motors, junction boxes, luminaires, instrumentation — is installed.
  • Zone 2 — an explosive atmosphere is unlikely to occur in normal operation but may occur in abnormal conditions. Zone 2 covers the wider process module area, cable deck below the process deck, and other areas adjacent to Zone 1. Category 3G (Gc) equipment or better is required. Many offshore platforms classify the entire external deck area as Zone 2 as a conservative measure.
  • Area classification drawings — every offshore installation has area classification drawings that define the zone boundaries. These are produced in accordance with IP15 / IEC 60079-10-1 and are part of the installation's safety case. Electrical engineers must consult area classification drawings before any equipment selection or installation work.
03 · Specialist Sector

Hazardous Area Equipment Selection

Equipment selection for hazardous areas on offshore installations must comply with the ATEX Directive (2014/34/EU as retained in UK law) and relevant IEC 60079 series standards. The protection concept (Ex type) must be appropriate for the zone and the equipment category.

  • Ex d (flameproof) — the equipment enclosure is designed to contain an internal explosion and cool the products of combustion before they reach the surrounding atmosphere. Used for motors, switchgear, and junction boxes in Zone 1 and Zone 2. Robust and widely used offshore but heavy and relatively expensive.
  • Ex e (increased safety) — electrical equipment that does not produce sparks or hot surfaces in normal operation is enclosed to a higher standard to reduce the risk of ignition. Used for terminal boxes, lighting fittings, and motors in Zone 1 and Zone 2. Lighter and less expensive than Ex d.
  • Ex ia/ib (intrinsic safety) — the electrical energy in the circuit is limited to levels that cannot ignite the hazardous atmosphere under normal or fault conditions. Used for instrumentation and control systems. Ex ia (two fault tolerance) is suitable for Zone 0. Critical to understand associated apparatus and entity parameters when designing intrinsically safe circuits.
  • Ex n (non-sparking) / Ex ec — simplified protection for Zone 2 only. Equipment is designed not to produce sparks, arcs, or hot surfaces capable of igniting a Zone 2 atmosphere. Less expensive than Ex d or Ex e and suitable for Zone 2 luminaires, motors, and control gear.

All Ex equipment must be installed in accordance with the manufacturer's installation instructions and the relevant IEC 60079 installation standard (IEC 60079-14). Specific requirements for cable gland selection, earth bonding, conduit sealing, and enclosure integrity apply. CompEx certification is required for electricians installing or maintaining Ex equipment.

04 · Specialist Sector

Essential Services & Emergency Shutdown (ESD)

Essential services are those electrical systems that must be maintained under any circumstances to protect personnel and the installation. They are the highest priority in the offshore electrical hierarchy and their integrity is maintained through design, maintenance, and testing regimes.

  • Emergency Shutdown (ESD) systems — safety instrumented systems (SIS) that automatically shut down production in response to hazardous conditions. ESD electrical systems must maintain integrity during and after the emergency event they are responding to. Power supply to ESD systems is typically from dedicated essential buses with UPS backing.
  • Fire and gas detection — fire and gas detection systems, including gas detectors, flame detectors, heat and smoke detectors, must remain operational during a fire or gas release event — when they are needed most. Power supplies, cabling routes, and fire integrity ratings are all critical design considerations.
  • Emergency lighting and PAGA — escape route lighting, muster station lighting, and the Public Address General Alarm (PAGA) system must operate during a mains power failure. These systems are powered from the essential electrical distribution system and backed by UPS and emergency diesel generation.
  • Electrical distribution hierarchy — offshore installations typically have a tiered electrical distribution architecture: main power generation (main gas turbine or diesel generators) → main switchboard → essential switchboard → emergency switchboard. Each tier has automatic changeover and the emergency tier is backed by a dedicated emergency diesel generator that starts automatically on mains failure.
05 · Specialist Sector

UPS Systems & Battery Systems Offshore

Uninterruptible Power Supply (UPS) systems on offshore installations are critical infrastructure. They bridge the gap between main power loss and emergency generator start-up, and provide clean, regulated power to sensitive instrumentation and control systems during normal operation.

  • Autonomy requirements — offshore UPS systems are typically sized to provide power for a defined period (autonomy) that allows for safe shutdown of systems not backed by the emergency generator. Critical safety systems may require up to 30 minutes of UPS autonomy. Battery condition monitoring and regular discharge testing are essential maintenance activities.
  • VRLA and lithium-ion batteries — valve-regulated lead-acid (VRLA) batteries are the traditional technology for offshore UPS. Lithium-ion systems offer weight and space advantages — significant considerations on offshore platforms — but require careful thermal management and different maintenance procedures.
  • Maintenance requirements — offshore UPS maintenance includes regular load bank testing (to verify autonomy), battery impedance testing, electrolyte checks on flooded batteries, visual inspection, and verification of automatic transfer functions. Maintenance is carried out during platform shutdowns where possible to avoid disrupting essential services.

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06 · Specialist Sector

Survival Craft Electrical Systems

Survival craft electrical systems — the lifeboats and life rafts that are the last line of escape from an offshore installation — must function reliably in the most extreme conditions. Electrical maintenance of survival craft is a specialist task governed by SOLAS (Safety of Life at Sea) requirements and the craft manufacturer's specifications.

  • Launch and release systems — the electrical components of the davit system and on-load release mechanism must be maintained in perfect working order. These include hydrostatic releases, remote release circuits, and davit motor controls. Maintenance must be carried out by competent persons in accordance with the manufacturer's maintenance schedule.
  • Battery maintenance — survival craft batteries (for engine starting, navigation lights, and communications) must be maintained at full charge at all times. Battery condition is checked at defined intervals and full load tests are conducted periodically. Batteries are replaced on a scheduled basis regardless of apparent condition.
  • Navigation and communication equipment — EPIRB (Emergency Position Indicating Radio Beacon), SART (Search and Rescue Transponder), VHF radio, and navigation lights all have electrical maintenance requirements. Battery replacement intervals and test procedures are defined by SOLAS and the equipment manufacturer.
07 · Specialist Sector

BOSIET, HUET & GWO Offshore Survival Training

Survival training is mandatory for all personnel travelling to offshore installations. No one is permitted to board a helicopter for an offshore installation without a current BOSIET (or equivalent) certificate. The training is demanding, physically challenging, and genuinely important — helicopter ditching is a real risk in North Sea operations.

  • BOSIET (Basic Offshore Safety Induction and Emergency Training)— typically a three-day OPITO-approved course. Covers platform safety, fire fighting, first aid, sea survival, and Helicopter Underwater Escape Training (HUET). Valid for four years. Required for all first-time offshore travellers.
  • HUET (Helicopter Underwater Escape Training) — practical training in escaping from a simulated helicopter that has ditched in the sea and inverted. Involves multiple practice escapes with and without CSDB (Compressed Air Breathing Device) assistance. Physically demanding but essential preparation for offshore helicopter travel.
  • RBOSIET (Refresher BOSIET) — required every four years after the initial BOSIET. Covers updates to procedures and refreshes key practical skills. Typically one to two days. Some operators require refresher training at three years rather than four.
  • GWO Basic Safety Training — the Global Wind Organisation training standard for offshore wind, covering First Aid, Fire Awareness, Manual Handling, Sea Survival, and Working at Heights. Required for offshore wind turbine work rather than oil and gas. Certification is valid for two years.
08 · Specialist Sector

Rotation Patterns & Day Rates (2026)

Offshore electrical roles typically operate on rotational patterns with defined periods on and off the installation. The two-weeks-on/two-weeks-off pattern is the most common in the UK North Sea, though other rotations exist depending on the operator and the role.

  • 2/2 rotation — two weeks offshore (14 days including travel), two weeks at home. The most common pattern in the UK North Sea. Working days offshore are typically 12 hours. This equates to approximately 182 working days per year offshore.
  • 3/3 and 4/4 rotations — three or four weeks on, three or four weeks off. More common on FPSO vessels and in international locations. Less common in the UK North Sea for electrical roles but available on some longer-term maintenance contracts.
  • Day rates — contractor/self-employed — £400 to £700 per day for experienced offshore electrical engineers and CompEx-certified electricians. Day rates are typically paid for all days including leave days, giving an effective annual earnings of £73,000 to £128,000 at typical 2/2 rotation rates before tax and deductions.
  • Employed rates — offshore electrical engineers in employed positions typically earn £55,000 to £85,000 per year plus offshore allowances, shift premiums, and benefits. Accommodation, meals, and transport to the installation are always provided.
09 · Specialist Sector

For Electricians: Starting Your Offshore Career

Moving from onshore electrical work to offshore is a significant career step that requires specific qualifications and a realistic understanding of the lifestyle. The financial rewards are substantial, but the commitment — away from home for two weeks in every four — is also significant.

Your Qualification Roadmap

Start with CompEx certification (ExI units for installation and ExM for maintenance). Book BOSIET training as soon as CompEx is complete. Register with offshore electrical recruitment agencies — Petrofac, Wood, Bilfinger, and other major operators and contractors all use specialist offshore electrical recruiters. Consider your inspection and testing qualifications as these are valued for offshore maintenance roles.

Keep Your Certifications Organised

Offshore operators and contractors require evidence of current BOSIET, CompEx, 18th Edition, medical fitness, and other certifications before every trip. Use Elec-Mate to keep all your certificates organised, track renewal dates, and ensure you are never caught out by an expired certificate when a job comes up.

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