---
title: "How To Ship Modular Offshore Wind Installations"
description: "Shipping modular offshore wind? Our guide covers planning, transport, delivery, documentation, and risk. OOG vs. breakbulk explained."
url: "https://shippinginternational.co.uk/how-to-ship/modular-offshore-wind-installations"
date: "2026-05-25T23:31:10+00:00"
language: "en-GB"
---

![modular offshore wind installations](https://shippinginternational.co.uk/images/si/modular-offshore-wind-installations.webp)

 # Shipping Modular Offshore Wind Installations

 ## Strategic Logistics Planning for Energy Infrastructure

Modular offshore wind installations represent the pinnacle of current energy engineering. Transporting nacelles, blades, and tower sections requires more than standard freight forwarding. It demands a project-led approach where logistics integrates with mechanical engineering. The UK is a global hub for offshore wind, and as an authority in the field, we manage the technical assessment of each module to prevent structural fatigue or misalignment of sensitive internal components during transit.

Success begins with a technical data audit. You must provide a General Arrangement (GA) drawing for every component. This allows our engineers to identify the exact centre of gravity and designated lifting points. For nacelles, which can weigh over 400 tonnes, maintaining a level lift is non-negotiable to prevent internal gearbox stress. We coordinate these movements through our [sea freight](https://shippinginternational.co.uk/services/sea-freight/) specialists to ensure vessel stability and deck strength are verified against the specific footprint of the turbine modules.

  ## Mode Selection: MPP, Semi-Submersibles, and OOG

Standard container ships are rarely suitable for wind infrastructure. Instead, we utilise Multi-Purpose Vessels (MPP) or heavy-lift vessels equipped with high-capacity geared cranes. These vessels enable independent loading and discharging at ports without specialised infrastructure for extreme heavy lifts. For projects originating in **Denmark**, we utilise the <a rel="noopener" target="_blank">Denmark sea freight</a> channels to secure vessels with the required deck space for blade stowage. Blades, often exceeding 80 metres in length, present a unique aerodynamic risk. Wind loading during sea transit can create significant torsional stress, necessitating custom-engineered frames.

### Sea Freight: Out-of-Gauge (OOG) vs. Breakbulk

Most wind components are classified as Out-of-Gauge (OOG) because they exceed the internal dimensions of standard containers. When shipping these units, we differentiate between OOG and **Breakbulk**. OOG units often travel on flat racks, while the largest nacelles and towers are shipped as breakbulk, meaning they are stowed directly on the vessel deck or within the hold. This decision depends on the **revenue tonne** calculation and the available slot space on the vessel. For components coming from **Germany**, we coordinate specialised berths via our [sea freight Germany](https://shippinginternational.co.uk/countries/germany/sea-freight-germany) network to manage quayside weight tolerances.

### Road Freight and Abnormal Load Transport

The journey from the port to the installation site or staging area is often the most critical phase. In the UK, turbine components are classified as abnormal loads. Moving an 80-metre blade requires specialised [road freight](https://shippinginternational.co.uk/services/road-freight/) solutions, such as extendable trailers or Self-Propelled Modular Transporters (SPMTs). We manage the mandatory ESD2 notifications to UK police and highway authorities, ensuring that the route is pre-cleared for bridge heights and turning radii. A route survey is essential to identify physical obstacles that could delay the delivery of the tower sections or nacelle.

  ## Incoterms 2020: Defining Risk and Liability

Selecting the correct Incoterm (International Commercial Term) is a critical commercial decision. For wind projects, we strongly discourage the use of **Ex Works (EXW)**. Under EXW, the buyer is responsible for loading, a task that requires the manufacturer’s specialised heavy-lift cranes and engineering staff to perform safely. If a nacelle is damaged during loading under EXW, the buyer bears the total loss despite having no control over the operation.

We typically recommend **Free Carrier (FCA)** or **Delivered at Place (DAP)**. These terms ensure that the party with the best technical knowledge of the equipment manages the loading and initial transport. For international project cargo, refer to the [International Chamber of Commerce](https://iccwbo.org/resources-for-business/incoterms-rules/incoterms-2020/) for the definitive 2020 rules. These rules dictate where the risk of loss transfers, which is vital for high-value assets moving to regions like **China**. Our [sea freight China](https://shippinginternational.co.uk/countries/china/sea-freight-china) team ensures all local arrival risks are accounted for in the contract terms.

  ## Technical Documentation and Legal Compliance

Compliance for wind installations extends beyond standard manifests. Because these units contain sophisticated power electronics, cooling oils, and often hydraulic fluids, documentation must be exhaustive to prevent demurrage charges and project delays.

### Essential Shipping Documents

- **Certificate of Origin (COO):** Required to determine preferential duty rates under UK Trade Agreements.
- **Material Safety Data Sheet (MSDS):** Required for nacelles, as they contain significant quantities of gear oil and industrial lubricants.
- **Export Licenses:** Some dual-use technology in turbine control systems may require a license from the [Export Control Joint Unit](https://www.gov.uk/government/organisations/export-control-joint-unit) (ECJU).
- **Packing List:** A detailed breakdown of every component, frame, and securing bolt to facilitate customs inventory.

For UK exports, ensure your commercial invoice mirrors the latest [GOV.UK trade documentation](https://www.gov.uk/guidance/international-trade-paperwork-the-basics) standards to avoid port-side holds. If a shipment is urgent, we utilise [air freight](https://shippinginternational.co.uk/services/air-freight/) for critical sensors and small spare parts to keep the installation on schedule.

  ## Customs, VAT, and Duty Management in the UK

Importing or exporting industrial energy machinery into or from the UK requires an EORI (Economic Operator Registration and Identification) number and a deep understanding of the Customs Declaration Service (CDS). Wind turbine components typically fall under HS Code Chapter 84 (machinery) or Chapter 73 (steel tower sections). You must account for 20 per cent Import VAT and applicable customs duties. Our [customs clearance](https://shippinginternational.co.uk/services/customs-clearance/) team specialises in classifying these modules to ensure you do not overpay on import duty.

### Tax Relief Regimes

If components are entering the UK for specialised assembly or repair before being re-exported, you may utilise **Inward Processing (IP)**. This regime allows you to suspend Import VAT and duty, providing a significant cash-flow advantage. Similarly, **Temporary Admission (TA)** can be used for units brought to the UK for testing or exhibition. We advise clients to check the [GOV.UK customs guidance](https://www.gov.uk/guidance/apply-to-delay-or-pay-less-duty-on-goods-brought-into-the-uk-temporarily) to ensure they meet the criteria for these relief schemes.

  ## Risk Controls: SOLAS VGM and Marine Insurance

Safety at sea is governed by strict international conventions. Two areas are non-negotiable for wind infrastructure cargo: weight verification and insurance coverage.

### Verified Gross Mass (VGM) Compliance

Under the **Safety of Life at Sea (SOLAS)** convention, every item loaded onto a vessel must have a certified weight. This regulation was introduced by the **International Maritime Organisation (IMO)** to enhance maritime safety and prevent incorrect decisions on vessel stowage. For modular turbine assemblies, we utilise **Method 2** for VGM. This involves weighing all individual components, packing materials, and transport frames, then adding them to obtain the final certified weight. Inaccurate weight declarations can lead to vessel instability and are strictly monitored by the [Maritime and Coastguard Agency](https://www.gov.uk/government/organisations/maritime-and-coastguard-agency) in the UK. Failure to provide a VGM will result in the cargo being rejected at the terminal gate.

### Marine Cargo Insurance

Carrier liability is limited by the Hague-Visby Rules, which usually cover only a few pounds per kilogram. This is insufficient for a multi-million-pound nacelle. We advise securing **Institute Cargo Clauses (A)** for **All Risks** coverage. This protects against theft, damage during heavy weather, and handling accidents. Given the technical nature of wind turbines, ensure the policy covers **Mechanical and Electrical Derangement**, as internal damage without external signs of impact can render a unit inoperable at the installation site.

  ## Cost Drivers: BAF, Demurrage, and Detention

Budgeting for modular wind assemblies requires an understanding of **Landed Cost**. The freight rate is only one component. You must also factor in technical surcharges.

- **Bunker Adjustment Factor (BAF):** Fuel surcharges that have become more volatile since the **IMO 2020** low-sulphur mandate. This regulation reduced fuel sulphur content from 3.5 per cent to 0.5 per cent to achieve CO2 emission reductions consistent with the Paris Agreement.
- **Demurrage and Detention:** These are fees incurred when cargo or containers remain at the port beyond the agreed free time. **Demurrage** applies to the time cargo spends at the terminal, while **Detention** applies to the time the transport equipment is held outside the port. Missing paperwork is the primary cause of these costs.
- **Lashing and Securing Fees:** Professional stevedores must secure the cargo using certified chains, turnbuckles, and welded sea-fastenings. This technical labour is a significant cost driver for OOG shipments.

For more information on standard trading conditions, we recommend reviewing the [British International Freight Association (BIFA)](https://www.bifa.org) guidelines, which outline the liabilities and responsibilities of freight forwarders in the UK.

  ## Frequently Asked Questions

#### What is the difference between OOG and Breakbulk cargo?

OOG (Out-of-Gauge) cargo refers to items that exceed the standard dimensions of a 40ft container but are still transported using container ship equipment, such as flat racks. Breakbulk cargo refers to items stowed directly on the vessel, either on deck or in the hold, because they are too large or heavy for container ship hardware.

#### Do I need a specific export license for wind turbine tech?

Yes, certain components, such as sophisticated sensors, power converters, or specific composite materials in blades, may fall under dual-use regulations. You should consult the UK Strategic Export Control Lists via the ECJU to confirm if a license is needed before shipping.

#### How is VAT handled on wind turbine exports from the UK?

Exports from the UK are generally zero-rated for VAT, provided you maintain official proof of export. This includes the Bill of Lading or an S8 document from a BIFA-accredited agent. For imports, you may use Postponed VAT Accounting (PVA) to improve cash flow by declaring and recovering import VAT on the same VAT return.

#### What is Method 2 for VGM weight verification?

Method 2 requires the shipper to weigh all individual components, including the machinery, packing materials, pallets, and dunnage, and then add the certified weight of the transport equipment. This is the preferred method for large modular assets that cannot be weighed on a traditional vehicle bridge.

#### How far in advance should I book a project vessel?

For specialised heavy-lift or MPP vessels, we recommend a minimum lead time of 3 to 6 months. This allows for the engineering of lashing plans, route surveys, and the procurement of necessary road permits for the inland leg of the journey.

  ## Optimise Your Offshore Wind Logistics

Navigating the complexities of shipping modular offshore wind installations requires specialised expertise. At Shipping International, we offer tailored solutions to ensure the safe, efficient, and cost-effective transportation of your valuable assets. Position your brand at the forefront of the renewable energy sector by partnering with a UK logistics authority.

[Contact us today](https://shippinginternational.co.uk/contact-us/) to discuss your project requirements and benefit from our extensive experience in the energy sector.

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