Submarine Power Cables Market (2026-2036)

The growth of this market is mainly driven by the scale of offshore wind connection required to meet installed capacity commitments, which cannot be delivered without export and array cable supply; the programme of interconnectors and cross-border transmission links being built to move power between markets and to balance variable generation; the shift to high voltage direct current at longer distances and higher transfer capacities, which raises both the cable content and the value per kilometre of each connection; and the electrification of islands and offshore platforms, which replaces local generation with a cable connection to shore. In addition, the standardisation of offshore grid connection at higher transfer capacities, long-term framework agreements that reserve manufacturing and installation capacity years ahead, and investment in new cable factories and cable-laying vessels are further supporting the growth of this market.

The Submarine Power Cables Market comprises the design, manufacture, installation, protection and maintenance of insulated power cables laid on or beneath the seabed to transmit electricity between points separated by water. The market includes high voltage direct current and high voltage alternating current cables for interconnectors and offshore wind export circuits, medium voltage array cables linking turbines within a wind farm to its offshore substation, cables connecting islands and offshore oil and gas platforms to the mainland grid, and the accessories, joints and terminations that complete each circuit. It also includes the marine services through which those cables are delivered, namely route survey and engineering, cable laying by dedicated vessels, burial and protection, pull-in and jointing, commissioning testing, and the repair, monitoring and spare cable provision that follow. The market ecosystem extends from copper and aluminium producers, polymer suppliers and armouring wire manufacturers through cable makers and marine installation contractors to transmission system operators, offshore wind developers, oil and gas operators, and the regulators and permitting authorities whose consent determines when a connection can be built.

This market is unusual in that demand is not the binding constraint. For the second quarter of 2026, reported on 30 July 2026, Prysmian S.p.A. recorded Transmission segment sales of EUR 882 million against EUR 743 million a year earlier, organic growth of 14.3%, adjusted EBITDA of EUR 179 million against EUR 125 million and a segment margin of 21.2% against 17.1%, with a Transmission backlog of EUR 17 billion. A backlog of EUR 17 billion against quarterly segment sales of EUR 882 million represents several years of work already contracted, and it is the clearest indication that the order intake problem in this industry has been solved.

The same picture appears at the other leading suppliers. The Nexans adjusted backlog stood at EUR 7.7 billion at 30 June 2026, flat against 31 December 2025, including EUR 1.2 billion for the Great Sea Interconnector, and the company stated that the backlog provides visibility until 2028. The NKT Transmission order backlog stood at EUR 13.0 billion at the end of the second quarter of 2026, or EUR 11.6 billion at standard metal prices, down from EUR 13.5 billion and EUR 12.0 billion respectively at the end of the first quarter as a result of project execution, and excluding five projects awarded under a TenneT framework agreement with an estimated value above EUR 2.5 billion. Taken together, the three largest Western suppliers held committed transmission order books of approximately EUR 37.7 billion in mid-2026, with further framework awards sitting outside those figures, against combined annual transmission revenues of a small fraction of that amount.

What those order books do not do is translate into revenue on demand. For the first half of 2026, reported on 29 July 2026, Nexans S.A. recorded PWR-Transmission standard sales of EUR 776.8 million, up 4.0% in reported terms but down 0.1% organically with second-quarter organic growth of negative 6.2%, while segment adjusted EBITDA rose 21.2% to EUR 106.5 million and the margin improved 195 basis points to 13.7%. A supplier reporting a record backlog while organic sales decline is not experiencing weak demand; it is experiencing a delivery constraint, since revenue in this industry is recognised as projects are executed and execution is limited by factory throughput, vessel availability, offshore weather windows and the readiness of the offshore and onshore works into which a cable must be connected.

Project completion also works against reported growth. For the first half of 2026, reported on 13 August 2026, NKT A/S recorded revenue of EUR 1,811 million with organic growth of negative 7% and an operational EBITDA margin of 15.8%, while in the second quarter its Transmission revenue fell to EUR 405 million from EUR 484 million as the Champlain Hudson Power Express project reached commercial operation and activity including subcontracted work declined, even as the segment operational EBITDA margin rose to 20.2% from 15.2%. A major interconnector reaching commercial operation removes its revenue from subsequent periods, and because each project is large relative to annual segment sales, the revenue profile of a submarine cable supplier is lumpy in a way that obscures the underlying expansion of the market.

The most informative evidence in the 2026 results is what happened to margins. Prysmian raised its Transmission margin to 21.2% from 17.1%, Nexans improved its PWR-Transmission margin by 195 basis points to 13.7% and NKT raised its Transmission margin to 20.2% from 15.2%, and two of the three achieved that while organic revenue fell. Margin expansion during a revenue decline is the signature of scarcity pricing, and it indicates that customers are paying to secure capacity rather than suppliers competing to fill it.

Capacity is therefore the central commercial question in this market, and it is being addressed on both the manufacturing and the installation side. Nexans brought the Nexans Electra, its third cable-laying vessel, into operation in the second quarter of 2026 on time and within budget, while NKT expects a new high-voltage factory in Karlskrona and additional capacity in Cologne to become operational in 2027 and a second cable-laying vessel to enter service in 2027. A cable factory and a cable-laying vessel each require several years and substantial capital to deliver, which is why capacity added in 2026 and 2027 was committed well before the current order books were secured, and why the supply response to present demand will arrive late in the decade rather than now.

Framework contracting has become the customary response of buyers to that constraint. Transmission system operators procuring multiple offshore connections to a standard design now award several projects to a supplier at once, reserving factory slots and vessel time years ahead rather than tendering each connection separately. The NKT Transmission order backlog stood at EUR 13.0 billion at the end of the second quarter of 2026, or EUR 11.6 billion at standard metal prices, down from EUR 13.5 billion and EUR 12.0 billion respectively at the end of the first quarter as a result of project execution, and excluding five projects awarded under a TenneT framework agreement with an estimated value above EUR 2.5 billion. The exclusion of framework awards from a reported backlog indicates how much contracted work sits outside conventional order book measures, and it means that published backlog figures understate rather than overstate the forward position of the industry.

The technology mix is moving toward higher transfer capacities and direct current. Longer connection distances, the need to move bulk power between markets and the standardisation of offshore grid connections at higher ratings all favour direct current, which carries more power over greater distance with fewer circuits, and extruded cross-linked polyethylene insulation has displaced mass impregnated designs at the voltages and ratings now being specified. The practical effect is that the cable content and the value per kilometre of a connection are rising, which contributes to market growth independently of the number of projects built.

The market includes European cable manufacturers, Japanese, Korean and Chinese cable groups, grid technology suppliers and marine installation contractors, among them Prysmian, Nexans, NKT, Sumitomo Electric Industries, Furukawa Electric, Fujikura, LS Cable & System, Taihan Cable & Solution, Hengtong Group, Jiangsu Zhongtian Technology, Ningbo Orient Wires & Cables, Hitachi Energy, TKF, JDR Cable Systems, DEME Group, Van Oord, Jan De Nul Group and Boskalis. Participants compete on qualified manufacturing capacity at the required voltage and rating, availability of cable-laying and burial vessels, type testing and prequalification against the standards a transmission system operator specifies, delivery schedule credibility, installation and jointing capability, project execution record on large contracts, and total delivered cost against a customer connection deadline.

At the same time, the market faces challenges, including the concentration of qualified supply among a small number of manufacturers, which exposes buyers to schedule risk; the long lead time and capital intensity of adding factory and vessel capacity; the execution risk carried on large fixed-price contracts, where a single installation problem can absorb the margin of an entire project; the scarcity of jointing and marine personnel; and the cable failure and repair exposure that follows installation, where a fault on a single export circuit can interrupt an entire offshore wind farm. As a result, suppliers that combine qualified capacity, owned installation assets and demonstrated execution on large projects are expected to capture the largest share of growth over the forecast period.

Repair, monitoring and spare cable services present an important opportunity attached to the installed base rather than to new build. A fault on an export circuit can interrupt an entire offshore wind farm, repair requires a suitable vessel, a jointing team and a compatible spare length, and the revenue foregone during an outage far exceeds the cost of holding that capability. The growth of installed submarine circuits is therefore creating a service market with recurring revenue, framework agreements for repair response and demand for distributed sensing and monitoring of cable condition, all of which carry higher margins and lower execution risk than project supply.

Offshore platform electrification and industrial connection present a growth opportunity distinct from power sector demand. Replacing gas turbine generation on offshore oil and gas platforms with a cable connection to shore reduces emissions and operating cost, and similar connections are being built to offshore aquaculture, data centre and hydrogen production sites. These connections are shorter and lower rated than interconnectors, which makes them accessible to suppliers without the largest direct current capability, and they are funded by industrial operators on commercial timescales rather than through regulated transmission allowances.