What Windstaller Alliance does

Windstaller Alliance is a non-incorporated, asset-light alliance formed on 14 October 2021 by three Norwegian-headquartered offshore energy suppliers: Aker Solutions, DeepOcean, and Solstad Offshore. Operating from Lysaker, Norway, the alliance functions as a project-based integrator for offshore renewables, delivering life-of-field support to floating and bottom-fixed offshore wind developers and operators. Services span six modules: Early Engagement (feasibility, concept studies, FEED), Project Management & Engineering, Procurement & Fabrication, Onshore & Inshore Operations, Offshore Operations (towing, mooring, hook-up, cable lay, trenching, commissioning), and Exit/Decommissioning. Revenue is generated through bespoke project contracts; pricing is not publicly disclosed.

The alliance leverages, but does not own, the combined capabilities of its three partners: approximately 60 vessels (including one of the largest high-end AHTS fleets), four state-of-the-art fabrication yards, 50+ ROVs, trenchers, cable repair spreads, and a combined workforce exceeding 16,000 across 35+ global locations. Its most differentiated technology is the Subsea Collector — marketed as the world's first subsea power distribution system for floating offshore wind, with claimed up to 10% total cost savings on a 1GW floating wind farm. The business model is enterprise field sales supplemented by partner-channel distribution, with no traditional product resale. Customers are exclusively large offshore wind developers and consortia (CIP, RWE, Ocean Winds, Saitec, Kansai Electric, METCentre, HydroQuest/Qair), and the alliance has executed engagements in Norway, Spain, France, Korea, and the UK. Governance is through a board comprising one senior executive from each partner (Valstad/Aker Solutions, Mikaelsen/DeepOcean, Solstad/Solstad Offshore).

Name

Windstaller Alliance

Legal name

Windstaller Alliance AS

Website

https://windstalleralliance.com

Company type

Private

Founded year

2021

Operating status

Operating

Headcount range

5,001–10,000 employees

Short description

Windstaller Alliance is a non-incorporated alliance between Aker Solutions, DeepOcean, and Solstad Offshore delivering integrated life-of-field offshore renewables services—from FEED and engineering through fabrication, marine operations, and decommissioning—to floating and bottom-fixed offshore wind developers globally.

Ownership category

akta.pro rank

Product category

Offshore Wind Services

NAICS

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

SIC

Water Transportation (4400), Electric & Other Services Combined (4931)

akta.pro primary industry

Marine & Offshore Wind BOP Construction (Foundations, Cables, Ports, Installation Support) (EUAMAFAI)

akta.pro secondary industries

Wind Turbine Installation & Commissioning (Cranes, Vessels, Jack-ups) (EUAMACAG), Offshore Wind Project Development & Leasing (EUAMACAB), Wind Operations, Maintenance & Asset Management (Scheduled/Unscheduled) (EUAMACAH)

Keywords

• Offshore wind services
• Floating wind installation
• Subsea cable services
• Marine operations
• Mooring fabrication

Headquarters

HQ city

Lysaker

HQ country

Norway

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Project-based Engineering and Project Management Services: Windstaller Alliance generates revenue through project-based contracts for engineering services, project management, and marine operations for offshore renewables projects. This includes FEED studies, detailed engineering, installation planning, and on-site project management from concept through operations.
2. Fabrication Services: Revenue from fabrication of mooring systems including anchors (suction, piled), installation aids, and other fabricated components for offshore wind projects. Aker Solutions contributes four state-of-the-art yards and broad product offering for substructure fabrication.
3. Offshore Marine Operations: Revenue from offshore vessel operations including towing, mooring, hook-up, cable installation and trenching, and commissioning. Solstad Offshore provides vessel fleet access and DeepOcean provides specialized subsea installation vessels and ROVs.
4. Subsea Services (IMR, Trenching, Cable Lay and Repair): Revenue from subsea inspection, maintenance and repair (IMR), trenching, inter-array cable lay and repair, and other subsea services. DeepOcean provides specialized assets including trenchers and cable repair spreads.

Go-to-market motion2 records

Distribution channels2 records

Marketing channels3 records

Core offering

Windstaller Alliance is a non-incorporated, asset-light alliance that provides integrated offshore renewables services for floating and bottom-fixed offshore wind projects. It combines engineering and project management, fabrication of mooring systems and anchors, offshore marine vessel operations (towing, mooring, hook-up, cable installation, trenching, commissioning), and specialised subsea services (survey, IMR, trenching, cable lay and repair) into a single life-of-field delivery model. The alliance serves offshore wind developers and operators worldwide by acting as a single integrator that consolidates the capabilities of partner companies Aker Solutions, DeepOcean, and Solstad Offshore.

Product overview

Windstaller Alliance is a non-incorporated, asset-light alliance that provides an integrated one-stop-shop service offering within offshore renewables. The company combines the strengths of three partner companies—Aker Solutions, DeepOcean, and Solstad Offshore—to deliver life-of-field support from concept to decommissioning. The core service portfolio spans Early Engagement (feasibility, concept studies, FEED), Project Management & Engineering, Procurement & Fabrication, Onshore/Inshore Operations, Offshore Operations (towing, mooring, hook-up, cable installation), and Exit/Decommissioning services. Supporting these core offerings are specialized Engineering and Execution capabilities, Fabrication services, an Offshore Vessels fleet (60 vessels), and Subsea Solutions. The alliance differentiates itself by reducing supplier interfaces and providing flexible delivery and contracting models tailored to client needs.

Differentiator

Problem solved

Functional benefit

Products and services

• Engineering and Execution Engineering expertise and project management capabilities for offshore renewables projects, covering early phase involvement, lifecycle role in marine operations, floating wind tow, mooring and hook-ups, and yard operations for integration between substructure and tower. Targeted at offshore wind developers and operators requiring integrated engineering delivery.
• Fabrication Services Design and fabrication of mooring systems and anchors (suction and piled), installation aids, and other offshore wind substructure components, drawing on heritage from complex offshore oil and gas projects and supported by four state-of-the-art fabrication yards. Targeted at offshore wind developers requiring mooring system supply and fabrication.
• Offshore Vessel Operations Access to a combined fleet of approximately 60 offshore vessels including high-end AHTS, subsea, and cable vessels through Solstad Offshore and DeepOcean, used for towing, mooring, hook-up, cable installation, trenching, and offshore wind installation campaigns. Includes development of next-generation environmentally friendly vessels and conversion of existing vessels for renewables. Targeted at offshore wind developers and operators requiring large-scale marine operations.
• Subsea Solutions Extensive subsea services including survey, inspection maintenance and repair (IMR), trenching, inter-array cable lay and repair, and other subsea services, supported by a large tool pool of ROVs, trenchers, and cable repair spreads through DeepOcean. Targeted at offshore wind developers requiring subsea installation, IMR, and cable services.
• Life-of-Field Support Package Integrated life-of-field delivery package covering early engagement (feasibility, concept studies, FEED), project management and engineering, procurement and fabrication, onshore and inshore operations, offshore operations (tow-out, mooring, hook-up, cable installation, trenching, commissioning), and exit/decommissioning — provided as a single-supplier interface for offshore wind developers and operators.

Quantifiable outcome

• 70% of floating wind projects in Europe have involved at least one of the three alliance partners
• +4 more outcomes

Named customers6 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

14 partnerships are on record, tiered core and minor.

• POSCO E&CcoreStrategic or Co-development Partner · 5 December 2025Windstaller Alliance signed a Memo of Understanding (MoU) with POSCO E&C, one of the largest Korean civil construction companies with significant experience in worldwide operations. The MoU solidifies collaboration where each company's unique capabilities will strengthen joint efforts in securing offshore renewables projects in the APAC region.
• HANA ShippingcoreStrategic or Co-development Partner · 5 December 2025Windstaller Alliance signed a Memo of Understanding (MoU) with HANA Shipping, a major shipping owner and operator in Korea with both existing and new bespoke construction assets for the offshore renewables industry. The MoU strengthens collaboration for securing offshore renewables projects in the APAC region.
• Aker SolutionscoreStrategic or Co-development PartnerAker Solutions is one of three founding partner companies of Windstaller Alliance. The company provides integrated solutions, products and services to the global energy industry, enabling low-carbon oil and gas production and developing renewable solutions. Aker Solutions contributes floating solutions, foundations, engineering expertise, project management, fabrication capabilities (four state-of-the-art yards), and subsea and topside equipment. The company employs approximately 11,700 people in 35 locations. Aker Solutions provides the Subsea Collector technology for floating offshore wind power distribution systems.
• DeepOceancoreStrategic or Co-development PartnerDeepOcean is a world-leading ocean services provider and one of three founding partner companies of Windstaller Alliance. The company enables energy transition and sustainable use of ocean resources, offering survey, engineering, project management, installation, maintenance, and recycling services for oil and gas, offshore renewables, deep sea minerals, and other ocean services. DeepOcean contributes extensive subsea capabilities with more than 1,300 highly skilled experts, more than 50 ROVs, and specialized subsea installation assets including trenchers and cable repair spreads.
• Solstad OffshorecoreStrategic or Co-development PartnerSolstad Offshore is a world-leading owner and operator of high-end offshore vessels and one of three founding partner companies of Windstaller Alliance. The company offers maritime excellence to the global offshore energy markets with approximately 3,000 highly skilled people on 9 offices and around 39 premium AHTS and construction vessels. The company has supported offshore wind farm installations, operations and maintenance since 2009. Fleet currently has vessels on battery or shore power with strong focus on innovative solutions for reducing fleet emissions.
• METCentre (Marine Energy Test Centre)minorStrategic or Co-development PartnerAker Solutions has a FEED contract with the Marine Energy Test Centre (METCentre) in Norway to pilot its Subsea Collector technology. Windstaller Alliance is subcontracted to deliver the FEED and installation for the world's first subsea power distribution system for floating offshore wind at METCentre's test area.
• Ocean Winds, Statkraft AS, Aker Offshore Wind (Consortium)minorStrategic or Co-development PartnerWindstaller Alliance was awarded a marine operations study for the consortium's preparations on the development of floating wind at Utsira Nord. The study covers temporary wet-storage of floaters and onshore handling of large amounts of heavy chains.
• HydroQuestminorStrategic or Co-development PartnerWindstaller Alliance was subcontracted to deliver the FEED for the subsea installation scope of the FloWatt Tidal Pilot developed by HydroQuest and Qair, to be installed offshore Normandy, France. The project is financed by the European Union TIGER program.
• QairminorStrategic or Co-development PartnerWindstaller Alliance was subcontracted to deliver the FEED for the subsea installation scope of the FloWatt Tidal Pilot developed by HydroQuest and Qair, to be installed offshore Normandy, France.
• Saitec OffshoreminorStrategic or Co-development PartnerSaitec Offshore developed the SATH concept, a concrete twin-hull barge structure for floating offshore wind turbines. Windstaller Alliance successfully completed the installation of the DemoSATH floating offshore wind turbine for Saitec Offshore in August 2023, managing tow, hook-up, and dynamic cable installation.
• RWE Offshore WindminorStrategic or Co-development PartnerRWE Offshore Wind is a partner in the DemoSATH project alongside Saitec Offshore and Kansai Electric Power. Windstaller Alliance completed the installation of the DemoSATH floating offshore wind turbine for this project.
• Kansai Electric Power Co. (KEPCO)minorStrategic or Co-development PartnerKansai Electric Power Co. (KEPCO) is a partner in the DemoSATH floating offshore wind project alongside Saitec Offshore and RWE Offshore Wind. Windstaller Alliance successfully installed the 2MW DemoSATH turbine at the BiMEP test site in Spain.
• Principle PowerminorStrategic or Co-development PartnerPrinciple Power works as a subcontractor to Aker Solutions on the Haewoori Offshore Wind project, performing the design of floating platforms and mooring system based on its proven WindFloat technology. Windstaller Alliance carries out transportation and installation design.
• Copenhagen Infrastructure Partners (CIP)minorStrategic or Co-development PartnerCopenhagen Infrastructure Partners is developing the Haewoori Offshore Wind 2 (500MW) and 3 (500MW) floating offshore wind projects off the coast of Ulsan, Korea. Aker Solutions won the FEED contract and Windstaller Alliance carries out transportation and installation design.

Scale indicators13 records

Recent moves7 records

Expansion highlights2 records

Direct peers

• Jan De Nul: Jan De Nul is a Belgian offshore installation contractor with a growing fleet of WTIVs and cable-lay vessels serving offshore wind developers. It directly competes with Windstaller on offshore wind installation, cable lay, and integrated EPCI scopes.
• DEME Group: DEME is a Belgian marine engineering and offshore wind contractor operating specialized installation vessels such as the Innovation. It competes with Windstaller on offshore wind foundation installation, cable lay, and balance-of-plant scopes across global markets.
• Havfram: Havfram is a Norway-based pure-play offshore wind installation contractor building a fleet of next-generation WTIVs for floating and fixed-bottom wind. It is a focused competitor in the same floating wind installation niche that Windstaller targets.
• Cadeler: Cadeler is a leading offshore wind transport and installation contractor operating a fleet of dedicated WTIVs and foundation installation vessels. It directly competes with Windstaller for offshore wind installation and T&I scopes, particularly in European and emerging APAC floating wind markets.
• Seaway 7: Seaway 7 is a dedicated offshore wind contractor within the Subsea 7 group, offering T&I, cable lay, and foundation installation services. It is a direct competitor for transport, installation, and cable lay scopes on floating and bottom-fixed wind projects globally.
• Van Oord: Van Oord is a Dutch marine contractor with a large offshore wind installation fleet and dedicated cable-lay vessels, providing EPCI services for offshore wind developers. It competes directly with Windstaller on integrated offshore wind installation scopes in Europe and beyond.

Broad incumbents

• Subsea 7: Subsea 7 is a global subsea contractor (parent of Seaway 7) providing SURF, pipelay, and offshore wind installation services. Its scale, fleet, and engineering capabilities make it a broader incumbent competing with Windstaller on integrated offshore energy scopes.
• Saipem: Saipem is a global EPC contractor serving oil & gas and renewables, with capabilities in offshore wind foundation fabrication, installation, and engineering. It competes with Windstaller on integrated offshore wind EPCI scopes, particularly for large-scale projects.
• Boskalis: Boskalis is a Dutch marine services and offshore contractor with capabilities in seabed preparation, cable lay, and offshore wind installation. It competes with Windstaller on marine preparation and balance-of-plant scopes for offshore wind developers.

Emerging players

• Heerema Marine Contractors: Heerema is a global heavy-lift and offshore installation contractor known for large jacket and topside lifts, increasingly extending into offshore wind foundation installation. It overlaps with Windstaller on marine installation and heavy-lift scopes for offshore wind projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/windstaller-alliance

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Funding overview

Funding rounds

Investors

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 Windstaller Alliance