// IN SHORT

Short answer: Pre-assembly is the work of fitting out turbine components on the ground, before the turbine is erected. In ports, yards or factories, technicians install everything that goes inside the tower sections and nacelle: ladders, anchor points, cable trays, cables, safety equipment and electrical cabinets, and sometimes join tower sections. It's day-shift work in mechanical, electrical and lifting teams, usually on rotation away from home. For many new technicians, it's where a wind career starts. You'll need GWO BST and BTT, plus extra modules depending on the job.

What Is Pre-Assembly?

Pre-assembly means preparing and fitting out turbine parts on the ground before they're installed at the wind farm.

Think of it this way: it's much easier to fit a ladder inside a tower section while it's lying horizontally on the ground than once the tower stands 80 metres tall. So as much as possible is installed in advance. When the components reach the site, the installation team only has to put the big pieces together, almost like Lego.

Where it happens

  • Offshore projects: in large port facilities, where teams prepare tower sections, nacelles and other components before they're loaded onto installation vessels.
  • Onshore projects: at staging areas and storage yards near the wind farm, or sometimes at the factory.

What Do Pre-Assembly Technicians Do?

The work is very hands-on. Typical tasks, depending on the turbine model and the manufacturer's specifications:

  • Receiving and inspecting components: checking parts from the factory for transport damage and making sure everything is delivered.
  • Fitting out tower sections: installing ladders, platforms, anchor points, cable trays and ducts, safety devices, fire extinguisher holders and many other small fittings.
  • Electrical work: installing electrical cabinets and switches, pulling cables, and connecting them according to the drawings.
  • Mechanical work: bolting and torquing, and in some cases joining tower sections. Bigger jobs, like fitting the generator into the nacelle, often happen at the factory.
  • Quality control: checking every step against the manufacturer's instructions and documenting it.

Because so many small parts go in, the work needs to be methodical. A side benefit: if you spot a missing bolt or a wrongly connected cable on the ground, it takes minutes to fix. Found later at the top of the tower or out at sea, the same mistake costs much more time and effort.

👉 The bigger picture: What Does a Wind Turbine Technician Actually Do?

What to Expect on the Job

The teams

You'll work in a small group under a lead technician or supervisor. Teams are usually split by type of work:

  • Mechanical teams: ladders, fittings, bolting
  • Electrical teams: cabinets, cable pulling, connections
  • Lifting teams: rigging and moving components

The equipment

Even before assembly, turbine components are huge, so you'll work with plenty of machinery:

  • Crawler cranes: very tall and powerful, for example to stack tower sections
  • Cherry pickers and scissor lifts: to reach high points on large components
  • Rigging and lifting gear: there's a lot of lifting in pre-assembly, so good teamwork and clear signals matter

👉 Working at Heights: The Safety Mindset You Need

Shifts and rotations

  • Day shifts are the norm, usually up to about 10 hours. Whether you get a day off each week depends on the location and local labour law.
  • Night shifts can come up when a project is running late. They usually pay more.
  • Offshore projects in port often run on rotations like 2 weeks on, 2 off or 3 on, 3 off.
  • Onshore pre-assembly at remote sites or factories often runs on longer rotations, such as 6 weeks on, 2 off, and is sometimes combined with installation work.

Schedules are tight. If pre-assembly falls behind, the installation vessels and cranes have to wait, and that's very expensive. As a pre-assembly technician you'll usually live in a hotel or rented accommodation near the site.

👉 Accommodation, per diem and rotations explained: Benefits, Schedules & What Life on a Wind Farm Really Looks Like

Which Certificates Do You Need?

GWO's Entry Level Wind Technician Framework lists the recommended training for pre-assembly technicians:

Core (everyone):

  • GWO BST: First Aid, Manual Handling, Fire Awareness, Working at Heights
  • GWO BTT: Mechanical

Recommended for pre-assembly:

  • GWO BTT Bolt Tightening
  • GWO BTT Installation

Depending on the job and location:

  • BST Sea Survival (offshore port projects that involve vessel work)
  • Slinger Signaller (lifting operations, which are very common in pre-assembly)
  • Advanced Rescue Training, Lift User, Enhanced First Aid

Your employer will add its own training too: site safety rules, hand tools and the manufacturer's procedures.

👉 Course lengths and validity: GWO Certificates Quick Guide 👉 Prices: GWO Training Prices in Europe (BST & BTT) and How to Choose a Centre

The Perfect Start for New Technicians

For a new technician, a pre-assembly project is one of the best schools there is. You learn how the turbine's mechanical, electrical and hydraulic parts fit together, on the ground, where you can see everything and ask questions.

Once you understand the turbine from the inside, moving on to installation or service work at height becomes much easier and safer.

👉 What comes next: Wind Turbine Installation: From Ground to Grid 👉 Just starting out? How to Break into Wind Energy with No Experience 📬 Browse current wind jobs and subscribe to job alerts