Under the surface of our seas lies a growing, hidden network powering modern life. Subsea power cables stretch over thousands of kilometers, connecting offshore wind farms to national grids and enabling cross-border energy exchange. These cables are the invisible lifelines of the global energy transition, carrying clean, reliable electricity to homes, industries, and critical infrastructure worldwide.

As dependence on renewable energy grows, the security and resilience of these cables is a top priority for transmission system operators and energy developers. A single cable failure can immediately disrupt offshore wind operations and interconnectors, leading to severe financial and operational consequences. Studies indicate that around 80% of subsea cable outages are caused by external factors, including fishing gear, ship anchors, or natural events such as storms and landslides (ESCA/IMCA, 2025).

Preparedness is therefore critical. With decades of subsea cable expertise, Nexans offers Inspection, Maintenance and Repair (IMR) services designed to reduce downtime, mitigate risks, and protect critical energy infrastructure worldwide.

A growing demand for reliable power transmission

The rapid growth of offshore wind and cross-border interconnectors is reshaping energy systems worldwide. Subsea cables are now essential for transporting renewable electricity efficiently and reliably.

• Offshore wind capacity is increasing globally, with projects spanning Europe, Asia, and North America (IRENA, 2024).
• Cross-border interconnectors allow countries to balance supply and demand while integrating renewable energy.
• The global subsea cable market is expanding to meet growing electricity demand, with networks extending thousands of kilometers.

Cables are often installed in busy maritime areas and harsh environments, exposing them to external damage. Operators require robust strategies to maintain uptime and quickly respond to incidents.

Securing critical power infrastructure

Subsea cables face multiple operational risks that can disrupt power transmission:

• External threats: anchors, fishing gear, maritime traffic.
• Natural hazards: seabed movement, storms, landslides.
• Operational constraints: aging assets, limited repair capacity, and shortages of skilled jointers and marine engineers.

A single cable failure can lead to:

• Power outages for offshore wind farms and interconnectors.
• Interruptions in electricity exchange between countries.
• Significant financial losses, sometimes millions of euros per day (ESCA, 2025).

Downtime without a prepared contingency plan can last up to one year, emphasizing the need for proactive inspection, preventive maintenance, and rapid repair.

Proven performance and global expertise

Nexans brings decades of experience in cable systems and subsea operations, supporting projects across all major offshore regions.

With more than 40 years of subsea repair expertise and over 50 offshore repair joints successfully completed in harsh conditions, Nexans has built a strong track record in maintaining and restoring critical infrastructure. Leveraging a global presence across Europe, Asia, and Africa, the Group is able to respond quickly and efficiently to incidents wherever they occur.

IMR agreements significantly improve operational readiness. With pre-arranged resources and procedures, Nexans can mobilize within 72 hours and reduce response time by up to 70%, helping operators avoid prolonged outages that can otherwise last months.

Nexans delivers a comprehensive Inspection, Maintenance and Repair (IMR) solution designed to ensure the reliability and performance of subsea cable systems supporting offshore wind farms and cross-border interconnectors.

Covering the full lifecycle of cable assets, Nexans IMR combines advanced inspection technologies, preventive maintenance programs, and rapid repair capabilities to reduce risks and minimize downtime. Digital monitoring tools, real-time data analysis, and subsea inspection technologies enable early detection of anomalies, while condition-based maintenance helps preserve asset integrity and prevent unexpected failures.

In the event of an incident, Nexans mobilizes specialized vessels, expert teams, and pre-engineered repair solutions to restore operations quickly. This rapid response is critical for offshore wind connections and interconnectors, where downtime directly affects power transmission, grid stability, and revenues.

With one of the world’s most advanced cable-laying and repair fleets—capable of operating at depths of up to 3,000 meters—and continuous investment in innovation, Nexans ensures safe and efficient subsea interventions in even the most demanding environments. Each IMR agreement is tailored to the operator’s needs, delivering a turnkey solution for subsea cable reliability and resilience.

Failures cannot be entirely avoided—but their impact can be controlled.

By combining anticipation, monitoring, and rapid intervention, Nexans IMR solutions help protect offshore wind investments, secure interconnection capacity between countries, and ensure continuity of power supply.

Anticipate risks. Respond faster. Ensure continuity.