Why do subsea power cables require fiber-optic components?

Subsea power cables integrate fiber-optic cores to enable high-speed data communication between offshore platforms, wind turbines, and mainland grids. Additionally, these fiber-optic lines are used for distributed temperature sensing (DTS) and acoustic monitoring, allowing operators to detect cable faults, overheating, or external physical threats in real time.

How does this agreement benefit the broader offshore wind industry?

By securing a dedicated supply of fiber-optic components, NKT can guarantee more reliable delivery schedules for its high-voltage subsea cables. This directly reduces the risk of costly project delays for offshore wind developers who are currently facing severe supply chain bottlenecks and vessel availability constraints.

What market trends are driving Hexatronic's investment in Sweden?

The investment is driven by the global transition to renewable energy, specifically the massive capital expenditure flowing into offshore wind farms and cross-border subsea interconnectors. These projects require highly specialized, durable submarine cables that can withstand harsh marine environments for decades, driving sustained demand for premium European manufacturing.

Offshore Energy · June 29, 2026 (Jun 29) · 1 min read

Swedes expand cable capacity as part of long-term deal with NKT

Analysis

AI-assisted analysis · reviewed by Yuri Kan

Sweden's Hexatronic Group is expanding its manufacturing capabilities with a new production line dedicated to high-voltage subsea fiber-optic cables, directly supporting a long-term supply agreement with power cable giant NKT. This strategic expansion addresses the critical global supply chain bottleneck for offshore energy infrastructure, where integrated power and communication links are essential. By securing dedicated capacity, NKT bolsters its ability to deliver turnkey subsea power transmission projects, which are increasingly vital for offshore wind farms and interconnector grids.

Key Facts

Hexatronic Group is investing in a new, dedicated production line for fiber-optic submarine cables at its manufacturing facility in Hudiksvall, Sweden.
The expansion is driven by a long-term supply agreement with NKT, a leading global provider of high-voltage power cable systems.
The new production line will specifically manufacture fiber-optic elements integrated directly into NKT's high-voltage subsea power cables.
This investment aims to secure supply chain resilience and meet the surging global demand for offshore wind grid connections and interconnector projects.
The financial terms of the investment and the exact duration of the long-term agreement between Hexatronic and NKT were not publicly disclosed.
The expanded manufacturing capacity in Hudiksvall is expected to become operational to support NKT's upcoming project pipeline.

Background & Context

The rapid expansion of offshore wind energy and the integration of regional power grids have created unprecedented demand for high-voltage direct current (HVDC) and alternating current (HVAC) subsea cables. Modern subsea power cables do not just transmit electricity; they require integrated fiber-optic cores to facilitate real-time data transmission, structural monitoring, and grid control. NKT has been positioning itself to capture a massive share of this market, recently securing multi-billion euro framework agreements for North Sea and Baltic Sea projects, which in turn necessitates a highly secure supply of specialized components like Hexatronic's fiber-optic cables.

Market Impact

This partnership significantly strengthens the European supply chain for offshore energy infrastructure, reducing reliance on external component suppliers during a period of intense global competition. For Hexatronic, the deal guarantees long-term volume commitments and solidifies its position as a tier-one supplier to the high-voltage power sector. For NKT, securing dedicated production capacity mitigates the risk of project delays caused by component shortages, offering a competitive advantage in bidding for complex offshore wind and interconnector tenders. Ultimately, this vertical coordination helps stabilize the wider offshore energy market by addressing a key manufacturing bottleneck.

What to Watch

Industry observers should watch for the completion and commissioning timeline of Hexatronic's new Hudiksvall production line, which will dictate when this new capacity hits the market. Additionally, monitor NKT's upcoming project executions in the North and Baltic Seas to see how this integrated supply chain model impacts project delivery timelines. Finally, expect similar long-term, exclusive supplier agreements to emerge across the subsea cable sector as developers scramble to de-risk their supply chains ahead of the late-2020s offshore wind construction boom.

Frequently Asked Questions

Why do subsea power cables require fiber-optic components?: Subsea power cables integrate fiber-optic cores to enable high-speed data communication between offshore platforms, wind turbines, and mainland grids. Additionally, these fiber-optic lines are used for distributed temperature sensing (DTS) and acoustic monitoring, allowing operators to detect cable faults, overheating, or external physical threats in real time.
How does this agreement benefit the broader offshore wind industry?: By securing a dedicated supply of fiber-optic components, NKT can guarantee more reliable delivery schedules for its high-voltage subsea cables. This directly reduces the risk of costly project delays for offshore wind developers who are currently facing severe supply chain bottlenecks and vessel availability constraints.
What market trends are driving Hexatronic's investment in Sweden?: The investment is driven by the global transition to renewable energy, specifically the massive capital expenditure flowing into offshore wind farms and cross-border subsea interconnectors. These projects require highly specialized, durable submarine cables that can withstand harsh marine environments for decades, driving sustained demand for premium European manufacturing.

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