Østensjø Rederi

What Østensjø Rederi does

Østensjø Rederi is a privately held Norwegian offshore maritime services company founded in 1974 and headquartered in Haugesund, Norway. The company operates a fleet of approximately 31 vessels across three core segments: offshore energy (subsea construction, IMR, and platform supply), towage (terminal escort, LNG carrier berthing, harbor and offshore tug services), and offshore accommodation (high-end flotels with motion-compensated gangways). Its principal customers are major international energy companies including DeepOcean, Shell UK, Ørsted, Equinor, MHI Vestas, and Ocean Breeze Energy, with several relationships exceeding 25 years (Shell UK since 1977, DeepOcean for 26+ years) and contracts ranging from spot work to 15-year firm periods.

The fleet is built around advanced marine engineering rather than digital or AI capabilities. Key technical assets include DP-3 dynamic positioning systems (Kongsberg) on accommodation vessels, Wärtsilä battery-hybrid propulsion delivering 20-30% fuel reduction on Edda Fauna and Edda Flora, diesel-electric hybrid drives prepared for methanol fuel, shore power connectivity on Edda Ferd, and telescopic motion-compensated gangways with adjustable pedestals (13.5-32.5m reach) on flotels. Flagship vessels include Edda Freya (hybrid construction vessel featured on Discovery's Mighty Ships), Edda Fides and Edda Fortis (600- and 800-person capacity accommodation vessels), and three dual-fuel LNG tugs (Audax, Dux, Pax) that won "Tug of the Year 2017." Through its 50% joint venture Hydrogenious LOHC Maritime AS, Østensjø is preparing all six Edda Wind newbuilds for installation of LOHC-based zero-emission hydrogen propulsion.

The business model is built on long-term time charter and bareboat contracts negotiated directly with enterprise clients via dedicated chartering teams in Haugesund, Aberdeen (UK), and Malta. Firm contract durations run from months to 15 years, with the January 2025 announcements totaling approximately NOK 3 billion in firm period value across six vessels. The company is family-owned through Johannes Østensjø dy AS, wholly owns Edda Accommodation, holds 50% of Edda Wind (with Wilhelmsen owning the other 50%), and jointly controls Hydrogenious LOHC Maritime AS, enabling long-cycle capital deployment across offshore oil & gas, offshore wind, and towage segments.

Name

Østensjø Rederi

Legal name

Østensjø Rederi AS

Website

https://ostensjo.no

Company type

Private

Founded year

1974

Operating status

Operating

Headcount range

251–500 employees

Short description

Østensjø Rederi is a privately held Norwegian offshore maritime services company operating approximately 31 vessels across offshore energy, towage, and accommodation segments, serving DeepOcean, Shell UK, Ørsted, Equinor, and MHI Vestas through long-term time charter contracts.

Ownership category

akta.pro rank

Product category

Offshore Maritime Services

NAICS

Water Transportation (483), Support Activities for Water Transportation (4883)

SIC

Water Transportation (4400)

akta.pro primary industry

Offshore Support & Marine Logistics Vessel Operators (PSV/AHTS) (TLADABAL)

akta.pro secondary industries

Offshore Marine & Aviation Support (PSVs, AHTS, Crew Boats, Helicopters) (EUALABAJ), Marine & Offshore Energy O&M (Offshore Wind, Platforms, Subsea Assets) (EUAEAGAO)

Keywords

• Offshore vessel chartering
• Towage services
• Offshore accommodation
• Subsea IMR vessels
• Offshore wind SOV

Headquarters

HQ city

Haugesund

HQ country

Norway

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Supply Chain

Revenue model

1. Time Charter Contracts: Long-term time charter agreements for offshore vessels. Østensjø Rederi charters its vessels (construction vessels, PSVs, accommodation vessels, tugs, SOVs) to energy companies on firm-period contracts with options. Revenue is recurring based on day rates or contract values. Recent contracts total approximately NOK 3 billion in firm periods.
2. Bareboat Charter: Some vessels are chartered on bareboat contracts where the charterer operates the vessel while Østensjø provides the vessel asset.
3. Tug and Terminal Services: Towage and terminal service contracts including escort tugs, harbor tugs, mooring launches, and loading master functions at oil and gas terminals (e.g., Shell Nyhamna, Equinor Sture).

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Østensjø Rederi owns and operates a fleet of offshore support vessels, tugs, and accommodation ships, chartering them on time-charter and frame agreements to energy companies, terminal operators, and offshore wind developers. The business is organized into three areas — Offshore Energy (PSVs, subsea/IMR, construction, SOV/CSOV), Towage (harbor and escort tugs), and Offshore Accommodation (via the Edda Accommodation subsidiary) — primarily serving the North Sea with additional operations in the Mediterranean, Brazil, and Asia-Pacific.

Product overview

Østensjø Rederi is a leading provider of integrated maritime services operating a fleet of approximately 31 vessels across three core segments: Offshore Energy, Towage, and Offshore Accommodation. The Offshore Energy segment includes subsea vessels (Edda Flora, Edda Fauna) for global subsea operations, construction vessel (Edda Freya) for offshore construction and cable-laying, and PSV Edda Frende for supply duties. Towage services encompass offshore escort tugs and terminal service operations. The Edda Accommodation sub-brand operates purpose-built monohull accommodation vessels (Edda Fides with 600-person capacity, Edda Fortis with 800-person capacity) providing high-end offshore hotel services with advanced gangway systems. Edda Wind subsidiary (50% Østensjø, 50% Wilhelmsen) operates SOV/CSOV vessels for offshore wind farm services, with newbuilds prepared for zero-emission technology. The fleet is managed by Østensjø Rederi with long-term contracts for major energy companies including DeepOcean, Shell, Ørsted, and others.

Differentiator

Problem solved

Functional benefit

Brands

• Edda Accommodation: High-end offshore accommodation vessels providing hotel services, accommodation for offshore personnel with motion-compensated gangway systems for safe transfer to offshore installations.

Products and services

• Offshore Energy vessel chartering (PSV / Subsea / Construction / SOV) Time-chartering of dynamic-positioned offshore support vessels — including platform supply vessels (PSVs), subsea and IMR vessels, construction vessels, and service operation vessels (SOVs/CSOVs) — to oil-and-gas operators and offshore wind developers. Customers include offshore E&P majors and offshore wind EPCI contractors in the North Sea and other basins.
• Towage Services (harbor, escort, and ocean-going tugs) Harbor towage, ship-assist, and escort services delivered with a fleet of harbor tugs and larger ocean-going tugs, plus ship-handling at oil, gas, LNG, and container terminals. Customers are terminal/port operators and harbor authorities. A newbuild offshore tug (ST 933, delivery 2026) is on order to extend the segment.
• Offshore Accommodation (Edda Accommodation) Offshore accommodation services provided through the Edda Accommodation subsidiary (combination of ownership and operation of accommodation/service-operation vessels such as Edda Fides). Customers are offshore oil-and-gas operators, FPSO/FLNG operators, and offshore wind developers requiring safe accommodation near platforms, FPSOs, or wind farms. The Edda Accommodation brand also includes the Edda Wind SOV sub-fleet (Edda Mistral, Edda Passat, and the optional Havyard 833 design) targeted at the offshore wind market.
• Edda Fides — Accommodation/Service-Operation Vessel Named offshore accommodation and service-operation vessel in the Østensjø fleet, featuring hybrid battery propulsion, shore-power capability, and a liquid organic hydrogen carrier (LOHC) pilot for clean-tech use cases. Chartered to offshore energy operators.
• Edda Fortis — Accommodation/Service-Operation Vessel Named offshore accommodation/service-operation vessel in the Østensjø fleet, designed for offshore energy and wind applications with low-emission technology.
• Edda Mistral — Service Operation Vessel (offshore wind) Named Service Operation Vessel (SOV) in the Edda Wind sub-fleet, built to support offshore wind construction and O&M with walk-to-work capability.
• Edda Passat — Service Operation Vessel (offshore wind) Named Service Operation Vessel (SOV) in the Edda Wind sub-fleet, designed for crew transfer and operations support on European offshore wind farms.
• Edda Flora — Subsea / IMR Vessel Named subsea inspection, maintenance, and repair (IMR) vessel in the Østensjø fleet, chartered to subsea services companies and oil-and-gas operators for subsea campaigns.
• Edda Fauna — Subsea / Construction Vessel Named multi-purpose offshore support vessel designed for subsea inspection, maintenance, repair (IMR), and light construction operations in harsh-environment regions.
• Edda Freya — Construction Vessel Named offshore construction support vessel in the Østensjø fleet, used for subsea construction, IMR, and other offshore support work.
• Edda Frende — Platform Supply Vessel (PSV) Named platform supply vessel (PSV) in the Østensjø fleet, supplying offshore oil-and-gas platforms in the North Sea and Mediterranean.
• Edda Sun — Subsea Vessel Named subsea support vessel in the Østensjø fleet chartered for IMR and subsea construction work.
• Newbuild Offshore Tug (ST 933) Newbuild offshore tug on order for delivery in 2026, designed to expand Østensjø's towage capacity beyond harbor tugs to larger ocean-going and terminal-assist work.
• Technical ship management (Østensjø Skibs-Service) In-house technical, crewing, and operational management arm of the group, headquartered at Dusavik outside Stavanger, delivering ship-management services to the group's vessels and selected third-party clients.

Quantifiable outcome

• Battery hybrid system reduces fossil fuel consumption by 20-30% depending on weather and wind conditions (Edda Fauna, Edda Flora)
• +3 more outcomes

Named customers9 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

Feature6 records

Partnerships

Nine partnerships are on record, tiered core and minor.

• Astilleros GondáncoreStrategic or Co-development Partner · 25 November 2025Spanish shipbuilder with 20+ year relationship with Østensjø Rederi. Has delivered 13+ vessels to Østensjø, including Edda Passat, Edda Mistral, Edda Freya, and the new offshore tug (ST 933 design). Building CSOVs and SOVs for Edda Wind. Newbuild offshore tug contract signed November 2025 for Q1 2028 delivery.
• Hydrogenious LOHC TechnologiescoreStrategic or Co-development Partner · 2 July 2021Joint venture Hydrogenious LOHC Maritime AS founded to develop and commercialize LOHC-based emission-free propulsion systems for maritime use. Østensjø Group holds 50% stake. LOHC technology uses Benzyltoluene as hydrogen carrier — non-flammable and non-explosive. All six Edda Wind newbuilds prepared for LOHC installation. Enova funded initial project HyNjord with NOK 26 million.
• DeepOceancoreStrategic or Co-development Partner · 21 January 2021Østensjø Rederi and DeepOcean have a longstanding partnership spanning nearly 26 years since DeepOcean's inception. DeepOcean is a key charterer of Østensjø vessels including Edda Freya, Edda Flora, and Edda Fauna for subsea construction and IMR operations. Contracts extended through 2026-2027. The close geographic proximity in Haugesund creates operational synergies.
• MHI VestascoreStrategic or Co-development Partner · 26 April 2020Edda Wind signed 15-year firm charter with MHI Vestas for a newbuild SOV commencing Q2 2022 for offshore wind turbine maintenance operations. MHI Vestas recognized Edda Wind's emphasis on decarbonizing its fleet.
• Ocean Breeze EnergycoreStrategic or Co-development Partner · 26 April 2020Edda Wind signed 11-year firm charter with Ocean Breeze Energy (operator of BARD Offshore 1 wind farm) for CSOV commencing Q1 2022. Frontrunner vessel provided for first year before newbuild CSOV delivery.
• Salt Ship DesigncoreStrategic or Co-development Partner · 21 October 2019Norwegian ship design firm partnered with Østensjø Rederi to design the 88.3m CSOVs and 82.4m SOVs for Edda Wind. Designs feature battery hybrid propulsion, anti-heeling systems, motion compensated gangways, and LOHC readiness.
• Foss MaritimeminorStrategic or Co-development Partner · 1 October 2019Østensjø Rederi and Foss Maritime signed MOU to establish a partnership for providing domestic SOVs to US offshore wind market. Foss Maritime brings 130+ years of US maritime operations, Jones Act compliant vessel experience, and extensive US coastal presence. Østensjø brings SOV operational expertise.
• SkipstekniskminorStrategic or Co-development Partner · 11 March 2019Norwegian naval architect firm designed the ST 933 offshore tug — the first tug design from Skipstekniscal. Østensjø's newbuild offshore tug (contracted November 2025) uses this design.
• ØrstedcoreStrategic or Co-development Partner · 3 February 2018Ørsted (formerly DONG Energy) awarded Østensjø Rederi contracts in 2015 for SOVs Edda Passat and Edda Mistral for Race Bank and Hornsea 1 wind farms. Vessels built to Ørsted's specifications; 5+5 year charters. Ørsted is the world's largest offshore wind operator, making this a flagship partnership.

Scale indicators7 records

Recent moves9 records

Expansion highlights6 records

Direct peers

• Solstad Offshore: Norwegian offshore vessel owner and operator with a global fleet of OSVs, AHTS, PSVs, and subsea construction vessels. Directly comparable to Østensjø's offshore energy and subsea segments and competes for similar charter contracts in the North Sea.
• Vroon: Dutch-based offshore and coastal vessel operator with PSVs, subsea support, and offshore wind vessels. Comparable to Østensjø's PSV and offshore energy fleet and competes for North Sea and global offshore charters.
• DOF Group: Norwegian offshore vessel operator with a large AHTS/PSV/subsea fleet serving global oil & gas and renewables customers. Direct competitor to Østensjø's subsea, PSV, and IMR vessel offerings; Østensjø's former CEO spent 16 years at DOF.
• North Star Shipping: UK-based SOV and offshore wind service vessel operator with a growing fleet dedicated to European offshore wind farms. Directly comparable to Edda Wind's SOV/CSOV operations and competes for similar Ørsted/Equinor/RWE charter awards.
• Siem Offshore: Norwegian-based offshore vessel owner-operator with OSVs, subsea construction, and SOV vessels. Directly comparable in offshore energy and offshore wind service segments and competes with Østensjø in North Sea tenders.
• ESVAGT: Danish SOV and offshore service vessel specialist focused on offshore wind and oil & gas. Directly comparable to Østensjø's Edda Wind SOV/CSOV business and competes for the same wind-farm charter contracts.
• Havila Shipping: Norwegian offshore vessel owner-operator with PSV, AHTS, and subsea vessels serving North Sea and global markets. Directly comparable in fleet composition and customer base to Østensjø's offshore energy segment.

Broad incumbents

• Bourbon: French offshore vessel operator with global PSV/AHTS fleet serving oil & gas customers. Comparable in vessel type and customer segment to Østensjø's PSV/offshore energy business, though larger and more geographically diversified.
• Tidewater: Largest global offshore support vessel operator with a broad OSV fleet spanning the Americas, Asia-Pacific, and EMEA. Comparable to Østensjø's PSV/AHTS offerings but at much greater scale and geographic breadth.

Others

• Edda Wind: Listed pure-play offshore wind SOV/CSOV operator; majority-owned by Østensjø Group with Wilhelmsen as a 25% strategic partner. Operationally managed by Østensjø Rederi and uses Østensjø-designed vessel platforms — both sister company and closest pure-play comparable for the wind segment.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/-stensj-rederi-as

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Subsidiaries4 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 Østensjø Rederi