Seaway 7

What Seaway 7 does

Seaway 7 is the offshore wind business unit of the Oslo-listed Subsea7 Group, providing Transport and Installation (T&I) and EPCI services to major offshore wind developers in Europe, Taiwan, and the US. The company is organized as Seaway 7 ASA, headquartered in the Netherlands, with regional operations in Aberdeen (UK), Germany, Poland, and Taiwan. It is led by CEO Lloyd Duthie (effective 1 April 2026, succeeding Stuart Fitzgerald who was elevated to Subsea7 Group CEO).

Seaway 7's service offering spans the full fixed-bottom installation value chain: WTG foundations (monopiles, suction bucket jackets, pin-pile jackets, tripod, pre-piled jackets), inter-array and export submarine cable laying (including 66kV systems), offshore substation transportation and installation, fully integrated Wind Turbine Generator (WTG) T&I, and heavy transportation of oversized cargo. It has begun offering Floating Offshore Wind services as a forward extension. The underlying technology platform is a diversified, purpose-built fleet: the DP3 heavy lift vessel Seaway Strashnov with a 5,000t crane, the custom foundation installation vessel Seaway Alfa Lift, the next-generation jack-up turbine installation vessel Seaway Ventus, cable lay vessels, and six semi-submersible heavy transport vessels (Eagle, Falcon, Hawk, Osprey, Swan, Albatross). Seaway 7 has demonstrated proprietary installation methods, notably suction bucket foundation technology deployed on Seagreen (the world's deepest offshore wind farm at the time), and integrates third-party systems such as CRP Subsea's NjordGuard cable protection.

The business model is project-based, enterprise B2B contract services sold directly to offshore wind developers. Seaway 7 defines 'substantial' contracts as $150-300M and 'sizeable' as $50-150M, with revenue recognized against project milestones and offshore activity spanning 1-3 years per project. The customer base includes Ørsted, SSE/Equinor (Dogger Bank A/B/C), ScottishPower Renewables (East Anglia TWO), Ocean Winds (BC-Wind, Bałtyk 2&3), Skyborn Renewables (Gennaker), Synera Renewable Energy (Formosa 4/6), and the ESB/Red Rock Renewables JV (Inch Cape). The company has delivered 62+ projects, 1,300+ WTG foundations, 35+ substations, 3,400+ km of cable, and 19+ GW of clean energy capacity since 2009. Seaway 7 does not disclose stand-alone revenue but operates within Subsea7 Group, which guided 2026 group revenue of $7.4-7.8B; the pending Subsea7-Saipem merger is expected to close in H2 2026.

Name

Seaway 7

Legal name

Seaway 7 ASA

Website

https://seaway7.com

Company type

Public

Founded year

2009

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Seaway 7 is the offshore wind installation business unit of Subsea7 Group, providing transport and installation of wind turbine foundations, inter-array cables, offshore substations, and wind turbine generators to major offshore wind developers across Europe, Taiwan, and the US using a specialized vessel fleet.

Ownership category

akta.pro rank

Product category

Offshore Wind Installation Services

NAICS

Support Activities for Water Transportation (4883), Other Support Activities for Water Transportation (48839)

SIC

Water Transportation (4400), Water, Sewer, Pipeline, Comm & Power Line Construction (1623)

akta.pro primary industry

Wind Turbine Installation & Commissioning (Cranes, Vessels, Jack-ups) (EUAMACAG)

akta.pro secondary industries

Marine & Offshore Wind BOP Construction (Foundations, Cables, Ports, Installation Support) (EUAMAFAI), Offshore Wind Substructures & Marine Engineering (Monopiles, Jackets, Floating) (EUAMACAE), Offshore Wind Power Generation (Fixed-Bottom) (EUACAFAB), Offshore Wind Power Generation (Floating) (EUACAFAC)

Keywords

• Offshore wind installation
• Submarine cable laying
• Wind turbine foundations
• Offshore substation installation
• Heavy transportation vessels

Headquarters

HQ city

Oslo

HQ country

Norway

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Infrastructure, Personnel, Operations, Technology or R&D, Marketing or Sales, Supply Chain

Revenue model

1. Offshore Wind Installation Contracts: Seaway7 generates revenue through awarded contracts for the transport and installation of offshore wind project components including monopiles, transition pieces, inter-array cables, offshore substations, and wind turbine generators. Contracts range from sizeable ($50-150M) to substantial ($150-300M). Revenue recognition follows project completion milestones with offshore activities typically spanning 1-3 years per project.

Go-to-market motion2 records

Distribution channels1 record

Marketing channels4 records

Core offering

Seaway 7 provides integrated offshore wind project delivery services, including the transportation and installation (T&I) of wind turbine generator foundations, submarine inter-array and export cables, offshore substation jackets and topsides, and wind turbine generators. The company also offers heavy transportation of oversized cargoes using a fleet of semi-submersible vessels and is extending its offering into floating offshore wind installations.

Product overview

Seaway7 is a services company providing offshore wind project delivery services, not a software or platform product. The company offers an integrated suite of services for fixed and floating offshore wind projects: Cable Laying Services (submarine cable installation and maintenance), WTG Foundations (foundation installation using vessels like Seaway Alfa Lift and Seaway Strashnov), Offshore Substations (transportation and installation of substation jackets and topsides), Wind Turbines (transport and installation of wind turbine generators using Seaway Ventus jack-up vessel), Heavy Transportation (semi-submersible vessels for oversized cargo), and Floating Offshore Wind services. These services are delivered through the company's fleet of specialized vessels and are offered as an integrated delivery model for offshore wind developers.

Differentiator

Problem solved

Functional benefit

Products and services

• Cable Laying Services Submarine cable and subsea umbilical installation, repair and maintenance services, including ROV support, marine survey, UXO investigation, and remedial cable protection services. Delivered to offshore wind farm developers.
• WTG Foundations Installation services for wind turbine generator foundations using custom-built vessels including Seaway Alfa Lift and Seaway Strashnov, covering monopiles, suction bucket jackets, tripod, and pre-piled jackets.
• Offshore Substations Transportation and installation of offshore substation jackets and topsides using heavy lift vessels, with over 30 HVAC platforms installed to date. Targeted at offshore wind developers requiring grid connection infrastructure.
• Wind Turbines Fully integrated Transport and Installation (T&I) services for offshore wind turbine generators (WTGs) utilizing the next generation jack-up installation vessel Seaway Ventus. Offered to offshore wind farm developers.
• Heavy Transportation Heavy transport vessel operations providing engineered transportation solutions for demanding cargoes including offshore wind foundations and oversized floating and non-floating cargoes, using six semi-submersible heavy transportation vessels.
• Floating Offshore Wind Services for floating offshore wind installations, extending installation capabilities beyond fixed-bottom wind turbine installations. Targeted at floating wind farm developers.

Quantifiable outcome

• 19+ GW of clean energy capacity installed globally
• +4 more outcomes

Named customers8 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Three partnerships are on record, tiered core and supporting.

• SPIE Global Services EnergycoreStrategic or Co-development Partner · 7 May 2026SPIE Global Services Energy performs inter-array cable termination and testing works for Seaway7's Bałtyk 2 and Bałtyk 3 offshore wind projects in Poland. Work involves 66kV inter-array cable systems across 100 turbines at both wind farms with combined capacity of 1,440 MW.
• CRP SubseasupportingTechnology or IntegrationCRP Subsea supplies 142 NjordGuard cable protection systems for Seaway7's East Anglia TWO project. CRP Subsea is a UK-based specialist in cable protection systems, providing engineered protection against over-bending, abrasion, and fatigue for inter-array cable terminations.
• Subsea7 GroupcoreOthersSeaway7 is the operating entity for fixed offshore wind within the Subsea7 Group (Oslo-listed). Stuart Fitzgerald transitioned from Seaway7 CEO to Subsea7 CEO. Lloyd Duthie was promoted from Seaway7 Deputy CEO and VP UK/Asia to Seaway7 CEO. Subsea7 is merging with Saipem in H2 2026 pending regulatory approval.

Scale indicators10 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Aker Solutions: Norwegian offshore engineering and construction group with subsea and offshore wind execution capabilities. Operates in overlapping geographies with Seaway7 and competes for EPCI scopes on offshore wind developments.
• Royal Boskalis Westminster: Large Dutch dredging and marine services group with a growing offshore wind installation arm (including FPU/SOV and cable services). Broader portfolio than Seaway7 but overlaps meaningfully in offshore wind T&I.
• Saipem: Italian offshore EPCI contractor with subsea, SURF, and offshore wind capabilities; merging with Seaway7's parent Subsea7 in H2 2026. Comparable offshore services footprint and competing for many of the same EPCI scopes.
• McDermott International: Global offshore EPCI contractor with subsea, heavy lift, and offshore wind capabilities. Provides broader offshore execution services and competes for integrated offshore wind project scopes.

Direct peers

• Cadeler: Pure-play offshore wind installation company operating a fleet of new-build jack-up vessels for WTG and foundation installation. Closest direct peer to Seaway7, competing for the same large offshore wind T&I contracts across Europe, Taiwan, and the US.
• Heerema Marine Contractors: Specialist in offshore heavy lifting and transport/installation of offshore structures. Competes with Seaway7's heavy lift (Strashnov) and substation installation capabilities across offshore wind and oil & gas.
• Jan De Nul Group: Belgian offshore contractor delivering cable installation, foundation transport, and WTG installation services. Overlaps directly with Seaway7's cable laying, heavy transportation, and foundation installation offerings.
• Van Oord: Dutch marine contractor with offshore wind foundation, cable laying, and heavy lift installation capabilities. Competes with Seaway7 on monopile/TPI, inter-array cable, and substation installation scopes across European offshore wind tenders.
• DEME Group: Belgian marine contractor with offshore wind installation, cable laying, and heavy lift capabilities. Direct competitor across European offshore wind foundation, cable, and turbine installation scopes.

Emerging players

• Prysmian Group: Global cable manufacturer and installer with a dedicated offshore wind cable laying fleet (Leonardo da Vinci, etc.). Overlaps with Seaway7's inter-array and export cable installation business at the cable-scope layer of offshore wind projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/Seaway-7-118879764900863

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds1 record

Investors1 record

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Seaway 7