NKT

Updated: 2026-07-15

Overview

NKT is a Denmark-based manufacturer specializing in high-voltage and extra-high-voltage power cables, serving global energy infrastructure projects. Established in 1891, the company combines Scandinavian engineering with sustainable solutions, notably for renewable energy grids. Its product portfolio includes AC/DC submarine cables, underground cables, and accessories, compliant with international standards like IEC 60840. NKT cables are pivotal in modern power systems, enabling efficient electricity transfer across continents and to offshore wind farms. The company operates production facilities in Europe and collaborates with utilities and contractors to deliver customized solutions for grid stability and decarbonization goals.

Structure and Working Principle

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NKT’s high-voltage cables typically feature a conductive copper or aluminum core insulated with cross-linked polyethylene (XLPE) or ethylene propylene rubber (EPR). For submarine applications, layers of lead alloy, steel armor, and polyethylene sheath provide mechanical protection and waterproofing. The cables minimize electrical losses through optimized dielectric materials and precise manufacturing. Working at voltages up to 525 kV, these cables transmit alternating current (AC) or direct current (DC) with high reliability. DC cables are preferred for long-distance underwater routes due to lower capacitive losses, while AC systems dominate shorter terrestrial networks.

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Key Features

NKT cables are renowned for their durability under extreme conditions. The XLPE insulation offers high thermal resistance (up to 90°C continuous operation) and withstands electrical stresses, reducing failure risks. Corrosion-resistant sheathing materials extend service life in saline or chemically aggressive environments. Innovations like NKT’s 525 kV XLPE DC cable technology set industry benchmarks, enabling gigawatt-scale offshore wind connections. The company also emphasizes sustainability, using recyclable materials and low-carbon production methods aligned with the EU Green Deal.

Application Areas

NKT cables are deployed in diverse sectors: offshore wind farms (e.g., Hornsea Project One), interconnectors (e.g., Viking Link between UK and Denmark), and urban underground grids. They are critical for integrating renewables, replacing overhead lines in scenic areas, and connecting islanded networks. Submarine cables account for 60% of NKT’s revenue, reflecting the global shift toward offshore energy. The company also serves industrial plants and data centers requiring high-capacity, fault-tolerant power supply.

Maintenance and Precautions

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Proper handling during installation is crucial to avoid insulation damage. NKT recommends trained crews using specialized laying equipment, particularly for submarine routes where repairs are costly. Periodic testing with partial discharge detectors ensures long-term performance. Storage conditions matter: cables must be kept dry and protected from UV exposure. For underground installations, soil thermal resistivity surveys are advised to prevent overheating. NKT provides lifecycle support, including jointing kits and monitoring systems.

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B2B Procurement Guide

Buyers should specify voltage class, conductor size, and environmental ratings (e.g., underwater depth, soil conditions). Lead times for custom projects range from 12-24 months due to complex production and testing processes. Bulk orders (10+ km) may qualify for tiered pricing. Procurement teams must verify certifications, such as DNV GL or Cigré TB 722 compliance, and evaluate suppliers’ project references. NKT’s in-house engineering support assists with route planning and termination designs. Financing options, like green bonds, are available for sustainable energy projects.