Wind Energy
A wind turbine is an electromechanical machine on an exposed hilltop, a coastline or a platform at sea. Height, weather and the number of systems packed into one nacelle make the work hard.
Mechanical
Drivetrain parts carry heavy loads and fatigue cycles. Replacing them means lifting in a cramped nacelle, a long way off the ground.
- Gearbox inspection, repair and replacement.
- Main bearing and pitch bearing replacement.
- Blade inspection, repair and leading-edge erosion treatment.
- Yaw and pitch system maintenance.
- Hydraulic bolt tensioning and torque checks.
Electrical
The electrics run from low voltage control circuits up to the medium voltage connection. You need to be at home across the whole range.
- Generators: doubly fed induction (DFIG), permanent magnet (PMG) and synchronous.
- Power converter diagnostics and component replacement.
- Nacelle and pad-mount transformers.
- Medium voltage switchgear and array cables (33 kV and 66 kV).
- Substation and grid connection equipment.
Controls and SCADA
Turbine controls are often proprietary. Access can depend on the manufacturer's authorisation or training.
- Turbine controller diagnostics and fault analysis.
- SCADA configuration and communication faults.
- Software and firmware updates.
- Manufacturer systems such as Vestas, Siemens Gamesa, Enercon and Nordex.
The Access Challenge
Getting to the turbine can be as much work as the repair. It drives the schedule and the cost.
- Offshore transfer by crew transfer vessel (CTV) or helicopter.
- Remote onshore sites with poor road access.
- Weather windows that limit the working days.
- GWO Basic Safety Training, including working at height and, offshore, sea survival.
Solar Energy
A utility-scale solar farm is electrical infrastructure. DC strings, inverters, a medium voltage grid connection, a monitoring system, and often trackers that move the panels all day.
Electrical
The work covers the DC side and the AC side. You need to be safe on both.
Monitoring and Diagnostics
On a large site the faults hide in the data. An underperforming string, a damaged panel, a slow loss of output.
Mechanical and Civil
Trackers, structures and cable routes wear too. They are easy to leave off the maintenance plan.
Battery Energy Storage Systems (BESS)
Battery storage balances the output of wind and solar, and it is being built quickly across Europe. A BESS site mixes electrical engineering, battery chemistry and safety hazards. No traditional trade covers all of that on its own.
Electrical
A BESS works on both DC and AC, often at medium or high voltage on the grid side.
- Medium and high voltage grid connection equipment.
- Power conversion systems (PCS): bidirectional inverters.
- DC bus diagnostics and battery rack electrical testing.
- Isolation and switching across the AC and DC sides.
Battery Management
The battery management system (BMS) monitors and protects the cells. Its alarms are where most diagnosis starts.
- Cell balancing diagnostics and correction.
- Thermal management: HVAC or liquid cooling.
- BMS alarm investigation.
- The differences between chemistries such as LFP and NMC.
BESS Safety
BESS safety practice is still developing, and so is the training behind it. On a BESS site you need to understand:
- Thermal runaway: what triggers it, how it spreads from cell to cell, and how to respond.
- The toxic gases a failing cell gives off, such as hydrogen fluoride and carbon monoxide.
- DC arc flash, and why DC faults are harder to clear than AC ones.
- The battery-specific safety training the operator requires.
Green Hydrogen
Green hydrogen is made by electrolysis powered by renewable electricity. Plants are being built across Europe, but the technology is early in its deployment. Technicians with hands-on experience of it are few.
Electrolyser Maintenance
The electrolyser is the main machine in the plant. PEM (proton exchange membrane) and alkaline electrolysers need different maintenance. On both, a stack replacement is the big planned intervention, membrane condition is watched, and water quality decides how long a stack lasts.
Compression and Storage
Hydrogen is compressed for storage and transport, typically to 350 to 700 bar. That means high-pressure machinery, demanding seals, and embrittlement, where hydrogen weakens some metals over time.
ATEX and Hazardous Area
Hydrogen burns in air at anything from about 4% to 75% concentration and needs little energy to ignite. ATEX rules apply in full, and hazardous zones are often larger than on a conventional gas plant.
Detection and Monitoring
Hydrogen has no colour or smell and burns with an almost invisible flame. The plant depends on its detectors. Ultrasonic, catalytic and thermal conductivity sensors each need their own calibration and maintenance.
Many operators bring in technicians from neighbouring industries and train them on hydrogen as well: oil and gas for ATEX and high pressure, electrochemical processing, power electronics.
The Cross-Over Skill Set
In conventional maintenance you are usually a mechanic, an electrician or an instrument technician. Renewable energy work tends to need two or three of those at once.
Mechanical + Electrical + Height Access
Gearboxes and bearings, generators and converters, hydraulics for pitch and yaw, plus the fitness and certificates to work at height in a confined nacelle. Few people from a factory background have all of it.
Power Electronics + Electrochemistry + Safety
Power conversion, battery management, thermal management and the hazards of lithium-ion cells. Standard industrial training does not yet cover them.
Process Industry + ATEX + High-Pressure Systems
Hazardous area and high-pressure experience, usually from oil and gas. Add the electrochemistry that is more common in chemical engineering.
Name the combination in the mission brief. “Converter fault on a 3 MW turbine, GWO working at height required” tells a technician far more than “wind technician needed”, so they can price the work.
Disclaimer: This guide is general information, not professional, legal or safety advice. Standards, grid codes and site rules differ by country and by operator, so check what applies to your site before acting on anything here. FindFST accepts no liability for decisions made on the basis of this guide.
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