O.S. Energy

What O.S. Energy does

O.S. Energy GmbH is a German family-owned offshore service provider founded in 2002, headquartered in Glückstadt, Germany, with branch offices in Esbjerg, Denmark and Newcastle upon Tyne, United Kingdom. The company operates a fleet of nine group-owned multipurpose offshore service vessels supplemented by third-party chartered vessels, delivering specialised services to the offshore wind industry across the North Sea, Baltic Sea, Irish Sea and Mediterranean. Its customers include leading European offshore wind developers and operators (Ørsted, Vattenfall, Iberdrola, E.ON, TenneT, Energinet, WindMW), offshore survey firms (Fugro), oil and gas majors (TotalEnergies), port authorities (HPA Hamburg), and research institutions (HAW Kiel).

The company's core technology stack comprises DNV-classed multipurpose vessels equipped with StUk 4-certified survey systems, multibeam echo sounders, side scan sonar, sub-bottom profilers, ROVs, drone deployment systems, and dynamic positioning (DP2 on newbuilds). Flagship newbuild Fortuna Bluebird (delivery April 2026, 42.8m, 28-day endurance) and two planned sister vessels (2027) introduce methanol/hybrid propulsion and hydrogen fuel cell integration, developed in collaboration with MPC Capital and through EU Horizon 2020, MarRI-UK, ZEWT ReSHIP, and UK ProjectZERO programmes. The in-house marine and technical engineering team enables bespoke vessel modifications and proprietary equipment development, including a tubercle-assisted propulsion propeller targeting minimum 35% energy savings.

O.S. Energy monetises through three revenue streams: (1) project-based vessel charter with or without crew for survey, inspection, maintenance, supply and guard operations; (2) integrated shipmanagement services covering commercial, technical and crew management under ISO 9001/14001/45001, ISM and MLC certifications; and (3) consulting and customised engineering services including vessel modifications and equipment design. Pricing is quote-based and project-specific, with sales executed through direct B2B engagement targeting offshore wind farm owners, operators, government bodies and research institutions. The company is led by Managing Directors Vincent Nürnberg and Dr. Alexander Nürnberg.

Name

O.S. Energy

Legal name

O.S. Energy GmbH

Website

https://os-energy.de

Company type

Private

Founded year

2002

Operating status

Operating

Headcount range

11–50 employees

Short description

O.S. Energy is a German family-owned offshore service provider operating a fleet of nine specialised multipurpose service vessels for survey, inspection, maintenance and shipmanagement, serving offshore wind farm developers, operators, government bodies and research institutions across Northern Europe.

Ownership category

akta.pro rank

Product category

Offshore Wind Support Services

NAICS

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

SIC

Water Transportation (4400), Oil & Gas Field Services, Nec (1389)

akta.pro primary industry

Marine & Offshore Energy O&M (Offshore Wind, Platforms, Subsea Assets) (EUAEAGAO)

akta.pro secondary industry

Renewable Energy Asset O&M (Wind, Solar, Hydro, Geothermal) (EUAEAGAB)

Keywords

• Offshore wind services
• Vessel charter
• Marine survey
• Ship management
• Offshore support vessels

Headquarters

HQ city

Glückstadt

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Supply Chain, Marketing or Sales

Revenue model

1. Offshore Service & Operations: Charter of specialised multipurpose offshore service vessels for survey, inspection, maintenance, supply, guard, and chase operations. Vessels are chartered with or without crew, providing flexible floating work platforms for offshore wind projects.
2. Shipmanagement Services: Integrated vessel management services provided as single components or full package, including commercial management, technical management, crew management, logistics, purchasing, and training. Services certified to ISO 9001, 14001, 45001, ISM, and MLC standards.
3. Consulting & Customised Service Solutions: In-house marine and technical engineering team providing vessel modifications, specialised technical equipment development (survey poles, A-frames, vibration frames, boat landings), risk assessments, work method statements, and project management services.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

O.S. Energy provides offshore service and operations for the offshore wind industry using a fleet of 9 group-owned multipurpose service vessels, covering survey, inspection, maintenance, supply runs, and guard/chase vessel duties. The company also offers shipmanagement services (technical and crew management) for in-house and third-party tonnage, alongside consulting and customised offshore service solutions.

Product overview

O.S. Energy is an offshore wind service provider operating a fleet of nine specialized multipurpose service vessels (group-owned), complemented by third-party vessels under long-term or spot charter agreements. The company offers three core service lines: Offshore Service & Operations (survey, inspection, maintenance, supply, guard/chase vessels), Shipmanagement (technical and commercial management with ISM/MLC/ISO compliance), and Consulting & Customised Service Solutions (vessel modifications, specialized equipment development, project management). The fleet includes purpose-built vessels like the Fortuna series (Crane, Kingfisher, Puffin, Robin, Bluebird, Falcon) and owned vessels (Arne Tiselius, Hydrograf, Sverdrupson, Søløven, Prince Madog, Arctic Ocean, Arctic Hunter), serving survey, geophysical, environmental, and supply operations across the North Sea and Baltic Sea. The company's Research & Development Department focuses on decarbonization, hydrogen propulsion, and alternative fuel technologies.

Differentiator

Problem solved

Functional benefit

Products and services

• Offshore Service & Operations Charter and operations of multipurpose service vessels to offshore wind developers, operators, and TSOs for survey, inspection, maintenance, supply, and guard/chase duties during construction, commissioning, and operation of offshore wind farms.
• Shipmanagement Services Technical management and crew management for offshore vessels, delivered across the group fleet and made available to third-party shipowners needing professional shipmanagement support.
• Consulting & Customised Service Solutions Bespoke consulting and tailored offshore service packages designed around customer-specific requirements, drawing on the company's vessel, shipmanagement, and offshore wind expertise.

Quantifiable outcome

• Energy savings of up to 30% through tubercle-assisted propulsion propeller design
• +3 more outcomes

Named customers12 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• EU Horizon 2020coreStrategic or Co-development PartnerO.S. Energy participates in EU Horizon 2020 initiatives, contributing to research and development projects for maritime decarbonisation and alternative fuel propulsion systems. The company collaborates with leading research institutes and universities across Europe on innovative offshore vessel technologies.
• UK Department for TransportcoreStrategic or Co-development PartnerTransShip 2022 project part of the Clean Maritime Demonstration Competition, funded with £682k by the Department for Transport and delivered in partnership with Innovate UK. Part of the Prime Minister's Ten Point Plan for green shipbuilding and maritime technology (£20m government investment, £10m from industry).
• Maritime Research and Innovation UK (MarRI-UK)coreStrategic or Co-development PartnerMaritime Hydrogen Highway project is a £2.1 million development programme part funded under Smart Maritime Land Operations Call. MarRI-UK providing £1.3 million towards programme costs for national hydrogen highway network development integrating land, sea and port.
• Zero Emission Waterborne Transport (ZEWT)coreStrategic or Co-development PartnerReSHIP project under ZEWT framework aiming to achieve minimum 35% energy saving and halve hydrogen storage demands for future zero-emission shipping through revolutionary hydrogen-based propulsion and tubercle-assisted propulsion propeller design.
• Ecomar PropulsionminorStrategic or Co-development PartnerCollaboration on 1MW Demonstrator project to demonstrate clean propulsion system physical model. Ecomar building demonstrator at Hampshire research facility using O.S. Energy's newbuild vessel design with electric-hydrogen hybrid system.
• HAW Kiel (Forschungsplattform FINO 3)minorStrategic or Co-development PartnerAurelia WINO research project led by HAW Kiel for testing floating wave power plant at FINO 3 research platform in North Sea. O.S. Energy provides transport, installation, maintenance, and retrieval operations using DP2 vessel Fortuna Bluebird.
• UK Government (ProjectZERO)coreStrategic or Co-development PartnerProjectZERO is a research and development project to demonstrate feasibility of achieving zero emission operations, focusing on energy efficiency improvements, GHG emission reduction, hybrid electric operations, and alternative fuel regulations for UK offshore support vessels.
• MPC CapitalcoreStrategic or Co-development PartnerPartnership with MPC Capital for building next-generation Offshore Survey and Service Vessel (OSSV) Fortuna Bluebird. 42.8m vessel built to DNV class standards with methanol capability, supporting 28-day offshore endurance.

Scale indicators5 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• Solstad Offshore: Norwegian global OSV owner/operator with a large AHTS and PSV fleet serving oil & gas and renewables. Overlaps with O.S. Energy on offshore wind vessel services in the North Sea, but with substantially larger scale and broader end-market exposure.
• Vroon Offshore Wind: Dutch offshore vessel operator with a dedicated offshore wind division operating SOVs and subsea support vessels. Broader incumbent serving offshore wind, offshore oil & gas and cargo markets across Northwestern Europe.
• DOF Subsea: Norwegian offshore service vessel and subsea contractor with a global fleet of OSVs and subsea construction assets. Broad incumbent comparable on offshore survey, IMR and ROV operations for offshore wind developers, especially in Northern Europe.
• BOURBON: French-listed global offshore marine services company with a broad OSV fleet serving oil & gas and offshore wind. Incumbent peer offering vessel services across multiple offshore energy verticals, with overlapping exposure to offshore wind developers and survey/IMR work.

Direct peers

• Edda Wind: Norwegian-based, publicly listed owner/operator of CTVs and SOVs purpose-built for the European offshore wind industry. Direct competitor in survey, IMR and O&M vessel services, with a newbuild fleet expanding capacity from 2024 onward.
• North Star Renewables: UK-based operator of SOVs for offshore wind, part of the North Star group. Direct competitor in Northern European offshore wind O&M vessel services with similar purpose-built newbuild strategy and tier-1 developer customers.
• Fugro: Dutch global geo-data specialist operating its own survey vessels and providing geophysical, geotechnical and environmental site surveys for offshore wind. Direct comparable in survey/inspection services and also a disclosed customer of O.S. Energy for survey operations.
• ESVAGT: Danish offshore service vessel operator providing Service Operation Vessels (SOVs) and emergency response vessels to European offshore wind farms. Direct peer in offshore wind vessel services across the North Sea, with a larger fleet and broader SOV focus.
• Havfram: Norwegian offshore wind vessel operator with a fleet of WTIVs and support vessels targeting European offshore wind installation and O&M. Comparable in serving offshore wind developers with specialised tonnage, but larger and more focused on installation than survey/IMR.

Others

• Van Oord: Dutch marine contractor and offshore wind installation company operating its own fleet of cable-lay and installation vessels. Adjacent rather than directly competing, but operates in the same European offshore wind value chain and shares key developer customers.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@OSEnergy_GmbH
• LinkedInlinkedin.com/company/o-s-energy-gmbh
• Instagraminstagram.com/ose_azubi

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 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 O.S. Energy