doti deutsche offshore-testfeld- und infrastruktur-gmbh & co. kg

What doti deutsche offshore-testfeld- und infrastruktur-gmbh & co. kg does

DOTI (Deutsche Offshore-Testfeld und Infrastruktur GmbH & Co. KG) is the operating company of alpha ventus, Germany's first offshore wind park, located approximately 45 km north of Borkum in the German Exclusive Economic Zone of the North Sea. Founded in June 2006 as a joint venture by EWE AG (47.5%), RWE AG (26.25%), and Vattenfall Europe Windkraft GmbH (26.25%), DOTI commissioned the 60 MW wind farm on 27 April 2010 — making it the first offshore wind park worldwide to operate under high-sea conditions. The facility consists of 12 wind turbines (six Senvion 5M on jacket foundations and six Adwen AD 5-116 on tripod foundations), each rated at 5 MW, plus an offshore transformer substation that steps voltage from 30 kV to 110 kV before transmission to the German mainland via a subsea cable through Norderney to Hagermarsch.

DOTI generates revenue by selling electricity into the German transmission grid operated by TenneT TSO under the regulated feed-in tariff framework of the German Renewable Energy Sources Act (EEG). From 2010 through April 2025, the wind farm fed approximately 2.93 TWh of electricity into the grid — an annual average of ~193.1 GWh, equivalent to the consumption of ~55,000 German households. Investment volume at construction was approximately €250 million, with an additional €30 million in federal research funding. Beyond commercial power generation, DOTI operates alpha ventus as an industry test field: the dual-turbine/dual-foundation configuration produced comparative operational data that helped define the technical, regulatory, and ecological reference framework for all subsequent German offshore wind projects, supported by the RAVE (Research at alpha ventus) research program coordinated by Fraunhofer IWES with roughly 40 participating institutes.

DOTI is approaching the end of its planned 20-year life. With the wind farm celebrating 15 years of operation in spring 2025, the company is now developing an environmentally compatible decommissioning concept in close coordination with the Federal Maritime and Hydrographic Agency (BSH) — positioning DOTI to set the precedent for the first German offshore wind farm decommissioning. The company has no employees of its own, drawing personnel from the specialized departments of its three utility shareholders.

Name

doti deutsche offshore-testfeld- und infrastruktur-gmbh & co. kg

Legal name

Deutsche Offshore-Testfeld und Infrastruktur GmbH & Co. KG

Website

https://alpha-ventus.de

Company type

Private

Founded year

2006

Operating status

Operating

Short description

DOTI operates alpha ventus, Germany's first offshore wind farm commissioned in 2010 as a joint venture between EWE, RWE, and Vattenfall. The 60 MW facility generates electricity fed into the German grid under regulated EEG feed-in tariffs and serves as a research test field for the offshore wind industry.

Ownership category

akta.pro rank

Product category

Offshore Wind Energy

NAICS

Wind Electric Power Generation (221115), Electric Bulk Power Transmission and Control (221121), Power and Communication Line and Related Structures Construction (237130)

SIC

Cogeneration Services & Small Power Producers (4991), Water, Sewer, Pipeline, Comm & Power Line Construction (1623)

akta.pro primary industry

Offshore Wind Power Generation (Fixed-Bottom) (EUACAFAB)

akta.pro secondary industries

Wind Farm Ownership & Operations (IPP/Utility-Owned Asset Operations) (EUACAFAF), Wind Grid Interconnection & Power Systems (Transformers, Reactive Power, SCADA) (EUAMACAK), Wind Balance-of-Plant EPC (Crane Pads, Turbine Foundations, Internal Roads) (EUAEADAI), Wind Turbine Installation & Commissioning (Cranes, Vessels, Jack-ups) (EUAMACAG), Wind Farm EPC & Balance of Plant Construction (Civil, Electrical, Substations) (EUAMACAF)

Keywords

• Offshore wind energy
• Offshore wind farm
• Renewable energy generation
• Wind power infrastructure
• Offshore wind testing

Headquarters

HQ city

Oldenburg

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Operations, Infrastructure, Personnel, Technology or R&D

Revenue model

1. Electricity Sales to German Grid: DOTI generates revenue by selling electricity produced by the alpha ventus offshore wind park to the German transmission grid under feed-in tariffs regulated by the German Renewable Energy Sources Act (EEG). From 2010 to April 2025, the wind farm fed approximately 2.93 TWh of climate-friendly electricity into the German grid.

Distribution channels1 record

Marketing channels4 records

Core offering

DOTI operates the alpha ventus offshore wind farm, Germany's first offshore wind park commissioned in April 2010, located approximately 45 km north of Borkum in the German Bight. The wind farm comprises 12 wind turbines (6 Senvion 5M and 6 Adwen AD 5-116, each 5 MW) totaling 60 MW capacity, an offshore transformer substation, and subsea cable transmission infrastructure. DOTI generates and sells renewable electricity to the German transmission grid while serving as a test field providing operational data and research insights for the offshore wind industry.

Product overview

DOTI operates the alpha ventus offshore wind farm, Germany's first offshore wind park commissioned in April 2010. The facility comprises 12 wind turbines (6 Senvion 5M and 6 Adwen AD 5-116, each 5 MW) totaling 60 MW capacity, an offshore transformer station stepping voltage from 30 kV to 110 kV, and park-internal cabling. The wind farm serves as a test field for the offshore wind industry while delivering renewable power to the German grid. Research activities are conducted through the RAVE (Research at alpha ventus) program.

Differentiator

Problem solved

Functional benefit

Products and services

• alpha ventus Offshore Wind Farm Germany's first offshore wind park located 45 km north of Borkum in the German Exclusive Economic Zone, comprising 12 wind turbines (6 Senvion 5M and 6 Adwen AD 5-116) with 60 MW total installed capacity, an offshore transformer substation, and subsea cable transmission to the mainland at Hagermarsch. Sells renewable electricity to the German transmission grid (TenneT TSO) under EEG feed-in tariffs.

Quantifiable outcome

• 2.93 TWh of climate-friendly electricity fed into the German grid from 2010 to April 2025 (15 years)
• +3 more outcomes

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration4 records

Feature3 records

Partnerships

Eleven partnerships are on record, tiered minor and core.

• Northern HeliCopter GmbH (Emden)minorStrategic or Co-development Partner · 1 January 2015DOTI participates in a joint emergency rescue coordination agreement with other North Sea wind farm operators (Riffgat, Global Tech I, Trianel Windpark Borkum). Northern HeliCopter GmbH was awarded the contract for emergency helicopter rescue services for all four parks, coordinated through EWE Offshore-Service & Solutions GmbH.
• Rettungsleitstelle VENTUSmedic (Johanniter-Unfall-Hilfe)minorStrategic or Co-development Partner · 1 January 2015Medical control center in Berne, Germany, operating as part of the joint emergency rescue chain for North Sea wind farms including alpha ventus, in cooperation with Northern HeliCopter GmbH and the wind park operators.
• Fraunhofer IWES (Institute for Wind Energy Systems)coreStrategic or Co-development Partner · 1 January 2010Fraunhofer IWES coordinates the RAVE (Research at alpha ventus) research initiative, a comprehensive research program involving approximately 40 research institutes, companies, and authorities. The research covers operations, measurement and coordination, foundations and support structures, turbine technology and monitoring, grid integration, flows and turbulence, ecological monitoring, and safety.
• Federal Ministry for Economic Affairs and Energy (BMWi) / Federal Environment Ministry (BMU)coreStrategic or Co-development Partner · 1 January 2010The German federal ministries funded alpha ventus with approximately 30 million euros and continue to fund the RAVE research initiative. The BMU also coordinates the StUKplus ecological monitoring program through the BSH (Bundesamt für Seeschifffahrt und Hydrographie).
• Bundesamt für Seeschifffahrt und Hydrographie (BSH)coreStrategic or Co-development Partner · 1 January 2010BSH coordinated the StUKplus ecological research project and continues to oversee regulatory and environmental aspects of alpha ventus. BSH is the competent authority for offshore wind park approvals in the German EEZ.
• TenneT TSOcoreStrategic or Co-development Partner · 1 January 2010TenneT is the German transmission system operator responsible for connecting alpha ventus to the German electricity grid. The wind farm's power is transmitted via a 110 kV subsea cable routed through Norderney to the mainland at Hagermarsch, serving as a main transmission corridor for North Sea wind energy.
• Stiftung OFFSHORE-WINDENERGIE (Foundation Offshore Wind Energy)coreStrategic or Co-development Partner · 1 January 2006The Stiftung Offshore Windenergie (Foundation of the German Economy for the Use and Research of Offshore Wind Energy) was the owner of the project permit and was actively involved in the planning and approval process of alpha ventus. DOTI leased the permit rights under the designation 'Borkum West'. The foundation also co-implemented alpha ventus with DOTI as a pioneering project.
• EWE AGcoreStrategic or Co-development Partner · 1 January 2006EWE AG holds a 47.5% stake in DOTI. EWE increased its stake from one-third to 47.5% in December 2008. EWE contributes operational expertise and has developed the follow-up projects Riffgat and Trianel Windpark Borkum I/II based on alpha ventus experience.
• RWE AGcoreStrategic or Co-development Partner · 1 January 2006RWE AG holds 26.25% of DOTI, having acquired E.ON's stake in 2019. RWE is one of the three founding consortium partners and contributes to follow-up offshore wind projects.
• Vattenfall Europe Windkraft GmbHcoreStrategic or Co-development Partner · 1 January 2006Vattenfall Europe Windkraft GmbH holds 26.25% of DOTI as one of the three founding consortium partners. Vattenfall has developed follow-up projects DanTysk and Sandbank offshore wind farms.
• FINO1 Research PlatformcoreTechnology or Integration · 1 January 2003The FINO1 research platform was erected in 2003 near the alpha ventus site by order of the German Federal Ministry. It conducts continuous measurements of wind, waves, ocean currents, and seabed conditions, supporting both alpha ventus operations and broader offshore wind research. Data from FINO1 is publicly accessible.

Scale indicators8 records

Recent moves6 records

Expansion highlights3 records

Direct peers

• Trianel Windpark Borkum GmbH & Co. KG: Operator of the Trianel Windpark Borkum, an EWE-led consortium offshore wind farm in the German Bight, very close to alpha ventus. Same regional waters, similar consortium SPV structure, and same utility shareholder overlap (EWE), making it the closest direct operating peer.
• Riffgat Offshore Wind Farm: EWE-operated offshore wind farm in the German North Sea near Borkum, commissioned in 2014. Directly comparable as a small/medium-scale German offshore wind asset operated by one of DOTI's own shareholders, using lessons from alpha ventus.
• Global Tech I Offshore Wind GmbH: German North Sea offshore wind farm commissioned around 2015, developed by WPD. Closely comparable to alpha ventus in scale, era, and German North Sea location, serving the same TenneT-connected grid infrastructure.
• Meerwind Süd/Ost: German North Sea offshore wind farm (Meerwind Süd and Meerwind Ost) of similar vintage to alpha ventus, with comparable installed capacity. Directly comparable as another first-wave German offshore project.
• DanTysk Offshore Wind Farm: 288 MW German offshore wind farm in the North Sea operated by Vattenfall (a DOTI shareholder). DanTysk was explicitly developed using learnings from alpha ventus and represents the direct next-generation follow-up by one of DOTI's consortium partners.
• Amrumbank West: 288 MW RWE-operated offshore wind farm in the German North Sea, commissioned in 2015. Direct operating peer, owned by a DOTI consortium shareholder (RWE, which acquired E.ON's stake) and built using alpha ventus operational learnings.
• Nordsee Ost: 295 MW RWE-operated German North Sea offshore wind farm. Direct operating peer under common shareholder (RWE) and similar scale/timing to alpha ventus era projects.
• Borkum Riffgrund: Orsted-operated offshore wind farm in the German Bight near Borkum, directly adjacent to alpha ventus waters. Same waters, same TenneT grid connection point — a near-perfect geographic and operational peer.
• Wikinger Offshore Wind Farm: ~350 MW Iberdrola-operated German Baltic offshore wind farm commissioned in 2017. Comparable as a similarly-sized first-wave European offshore project owned by a major utility operating in the same regulatory and grid framework.
• EnBW Baltic 2: EnBW-operated German Baltic offshore wind farm commissioned in 2015, comparable in scale and vintage to alpha ventus. Directly comparable as another German utility-owned offshore SPV operating in German waters.

Market position

Strengths4 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds

Investors

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M&A

Investments

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Frequently asked questions about doti deutsche offshore-testfeld- und infrastruktur-gmbh & co. kg