The Hidden Backbone of Offshore Wind Projects
Lodewijk van Helden
Thursday, March 19, 2026
Submarine Cables: The Hidden Backbone of Offshore Wind Projects
When people think about offshore wind, they usually picture massive turbines rising above the sea. Towering structures, blades longer than football fields, and installation vessels working in challenging offshore conditions.
But the real backbone of every offshore wind project lies beneath the surface.
Submarine cables.
These complex power transmission systems are responsible for carrying electricity from offshore turbines to substations and ultimately to the onshore grid. Without reliable cable systems, even the most advanced wind turbines cannot deliver a single megawatt of energy.
As offshore wind farms grow larger and move farther from shore, submarine cable systems are becoming one of the most critical and complex elements of modern energy infrastructure.
Why submarine cables are becoming more critical than ever
The offshore wind industry is evolving at an unprecedented pace.
Turbines are becoming larger, wind farms are expanding further offshore, and transmission distances are increasing rapidly. Projects that once generated hundreds of megawatts now regularly exceed the one-gigawatt threshold.
This scale introduces new technical and operational challenges for submarine cable systems.
Higher power capacity
Longer transmission distances
More complex grid integration
Increasing installation depth
Stronger environmental conditions
At the same time, cable reliability has become more important than ever. A single cable failure can shut down large portions of a wind farm, causing significant production losses and costly repairs.
For developers and operators, ensuring cable system reliability is no longer just a technical consideration, it is a critical project risk.
The lifecycle of a submarine cable system
Submarine cable systems are among the most complex components of offshore wind infrastructure. Their lifecycle involves multiple highly specialised phases, each requiring different expertise and coordination.
1. Engineering and design
The process begins with extensive engineering studies. Route design, seabed conditions, electrical load calculations, and environmental constraints must all be carefully analysed before installation can begin.
Cable systems must be designed to withstand:
Seabed movement
Mechanical stresses during installation
Thermal loading from high electrical currents
Long-term corrosion in harsh marine environments
This phase determines the long-term reliability of the entire system.
2. Manufacturing and testing
Once designed, submarine cables are manufactured in specialised facilities. These facilities produce highly engineered cable structures consisting of multiple layers:
Conductors
Insulation
Water barriers
Armouring
Protective sheathing
Each cable undergoes extensive testing to ensure it can handle the extreme conditions it will face offshore.
Quality control during this stage is essential. Small manufacturing defects can later lead to costly failures in the field.
3. Installation and burial
Installation is one of the most challenging stages of the cable lifecycle. Cables must be carefully transported offshore, laid along pre-defined routes, and buried into the seabed to protect them from external damage such as anchors, fishing gear, or seabed movement.
Specialised cable-laying vessels and remotely operated vehicles (ROVs) are often used to ensure precise installation.
Weather conditions, seabed composition, and installation windows all play a significant role in determining how smoothly this phase proceeds.
4. Termination and connection
Once installed, cables must be connected to offshore substations and turbine arrays.
Cable termination and jointing require highly skilled technicians and precise procedures. These connections must ensure electrical reliability while withstanding constant offshore conditions.
Even small mistakes during termination can have long-term operational consequences.
5. Operation and maintenance
Once operational, cable systems require monitoring and maintenance to ensure long-term performance.
Modern projects increasingly rely on:
Fibre-optic monitoring systems
Temperature sensors
Real-time load monitoring
Predictive maintenance analytics
These technologies allow operators to detect potential issues before they escalate into failures.
The biggest risks in submarine cable projects
Despite advances in technology, submarine cables remain one of the most common sources of failure in offshore wind projects.
Common challenges include:
Installation damage
Incorrect burial depth
Manufacturing defects
Poor jointing or termination
Unexpected seabed movement
Many of these issues are not caused by technology alone, but by coordination challenges between contractors, engineers, and project teams.
That is why cable projects require not only technical expertise, but also strong project management and cross-disciplinary collaboration.
Offshore wind is scaling rapidly
Globally, offshore wind capacity is expected to grow dramatically over the next decade.
Europe continues to lead the industry, while Asia-Pacific markets such as Taiwan, South Korea and Japan are investing heavily in new offshore developments.
The United States is also accelerating its offshore wind ambitions, with several large-scale projects currently under development along the East Coast.
As wind farms move further offshore and capacities increase, submarine cable infrastructure will need to scale accordingly.
This will drive demand for:
High-voltage cable systems
HVDC transmission technology
Advanced cable monitoring solutions
Experienced subsea engineering partners
Why this matters for WolfWindWorks
At WolfWindWorks, we understand the complexity behind submarine cable systems and offshore infrastructure projects.
From engineering support to termination expertise, our team works alongside developers, contractors and operators to ensure projects are delivered safely, efficiently and reliably.
Large-scale offshore wind developments require more than strong technology. They require the right expertise, coordination and execution.
Subsea cable systems sit at the heart of that challenge.
And ensuring their success requires partners who understand both the technical and operational realities of offshore projects.
Looking for expertise in offshore cable systems and project execution? Need support navigating the complexity of large-scale offshore developments?
Get in touch with WolfWindWorks to learn how we can support your next offshore project.
WolfWindWorks perspective
At WolfWindWorks, we're not just builders—we're buffer zones against market turbulence. From balanced tender-to-delivery models to cash‑flow savvy engineering, we ensure your offshore ambitions stay on course, whatever storms hit.
👉 Need a partner that adapts, not exits?
Contact WolfWindWorks today
Frequently Asked Questions
Why did Ørsted drop out of the CCS tender?
Because its share value plunged sharply and it needed to reallocate resources to stabilize its offshore wind projects.
How much did Ørsted raise—and why?
Approx. DKK 60 billion (~$9.3B) through a rights issue to shore up its capital base for offshore wind delivery.
What’s next for Ørsted?
They’ll focus on deploying 8.1 GW of offshore wind capacity in Europe over the next two years.
Hi, I’m Lodewijk van Helden
Founder of WolfWindWorks
With over 15 years in offshore wind and subsea cable projects, I’ve worked across Europe and Asia on some of the industry’s most complex challenges. At WolfWindWorks, I share real-world insights and lessons learned to help contractors, developers, and EPCs deliver offshore projects smarter and safer.
One Question: What’s the Weakest Link in Your Project?
Every offshore project is unique. Our survey helps us understand your setup, challenges, and timelines so we don’t waste your time with generic advice.
Share your details, and we’ll reach out with tailored insights — plus a call to explore solutions together.
Independent offshore wind specialists focused on subsea cable projects. Field-proven support from tender to energization.
© WolfWindWorks BV | Powered by Giant Marketing B.V.