Overview

The Anholt Offshore Wind Farm is a major offshore wind power installation located in the Kattegat strait, situated geographically between the peninsula of Djursland and the island of Anholt in Denmark. Operated by the energy company Ørsted, the facility represents a significant component of Denmark’s renewable energy infrastructure. With a nameplate capacity of 400 megawatts (MW), the wind farm holds a prominent position in global offshore wind generation. Upon its commissioning in 2013, the Anholt project became the largest offshore wind farm in Denmark, maintaining this distinction until 2019. This operational milestone underscores the scale of investment and engineering required to harness wind resources in the North Sea and Baltic Sea transition zone.

Location and Grid Integration

The strategic placement of the wind farm in the Kattegat allows for efficient energy transmission to both the Danish mainland and the island of Anholt. A key feature of the Anholt Offshore Wind Farm is its direct grid connection to Anholt island. This infrastructure development has significantly altered the energy mix on the island, replacing most of the previously diesel-powered electricity supply with wind-generated power. The integration of the wind farm into the local grid demonstrates the potential for offshore wind projects to provide dual benefits: large-scale power generation for the national grid and localized energy security for nearby islands.

Operational Significance

As one of the largest offshore wind farms in the world, the Anholt project highlights the growing capacity of offshore wind technology. The 400 MW capacity contributes substantially to Denmark’s renewable energy targets, reducing reliance on fossil fuels. The operational status of the wind farm, maintained by Ørsted, reflects the maturity of offshore wind technology in the region. The project’s success has influenced subsequent offshore wind developments in Denmark and beyond, serving as a benchmark for large-scale wind energy integration. The replacement of diesel power on Anholt island also illustrates the environmental and economic benefits of connecting remote or semi-remote locations to offshore renewable energy sources.

History and Development

The development of the Anholt Offshore Wind Farm represents a significant milestone in Danish renewable energy infrastructure, evolving from initial conception in 2008 to full operational status in 2013. Located in the Kattegat strait, positioned between the peninsula of Djursland and the island of Anholt, the project was designed to harness strong wind resources in one of Denmark’s most productive offshore zones. The site selection was strategic, aiming to maximize energy yield while minimizing visual and acoustic impact on the mainland and island communities.

Licensing and planning phases began in earnest around 2008, marking the start of a multi-year development cycle. During this period, the project underwent extensive environmental impact assessments, grid connection studies, and stakeholder consultations. The licensing process involved coordination between national energy authorities, local municipalities, and the operator, Ørsted, which led the development effort. These early stages were critical in securing the necessary permits and defining the technical specifications for the 400 MW installation.

Ownership and corporate structure evolved during the development phase. Ørsted, originally known as DONG Energy before its rebranding, played a central role in financing and managing the project. The company leveraged its experience with earlier offshore wind developments in Denmark, such as Horns Rev and Nysted, to streamline engineering and supply chain logistics. Strategic partnerships and joint ventures were formed to distribute financial risk and enhance technical expertise, reflecting the growing complexity of large-scale offshore wind projects.

Construction activities commenced following the final investment decision, with foundation installation, turbine erection, and subsea cable laying progressing over several years. The project faced typical offshore challenges, including weather delays, supply chain coordination, and grid integration requirements. Despite these hurdles, the development remained on track, culminating in the official commissioning of the wind farm in 2013. Upon completion, the Anholt Offshore Wind Farm became the largest offshore wind installation in Denmark, holding that title until 2019.

The commissioning of the 400 MW facility marked a turning point for the island of Anholt, which historically relied heavily on diesel-powered electricity generation. A dedicated submarine cable was laid from the wind farm to the island, enabling the displacement of most diesel-generated power with clean, variable renewable energy. This infrastructure upgrade not only reduced local carbon emissions but also enhanced energy security and price stability for island residents.

The successful delivery of the Anholt project demonstrated the viability of large-scale offshore wind development in the Kattegat region. It provided valuable operational data and lessons learned that influenced subsequent Danish offshore wind projects, including Horns Rev 3 and Kriegers Flak. The project’s timeline—from conception in 2008 to commissioning in 2013—reflected a relatively efficient development cycle for an offshore wind farm of its size and complexity at the time.

Why it matters

The Anholt Offshore Wind Farm represents a significant milestone in global renewable energy infrastructure, particularly within the context of Denmark’s transition to wind power. With a nameplate capacity of 400 MW, it ranks among the largest offshore wind farms in the world. Its commissioning in 2013 marked a pivotal moment for Danish energy policy, establishing a new benchmark for offshore generation scale. At the time of its launch, it was the largest offshore wind farm in Denmark, holding this distinction until 2019. This period of leadership underscores the rapid pace of expansion in the Danish offshore sector, driven by strategic investments and technological advancements in turbine efficiency and grid integration.

Regional Energy Impact

Beyond its national ranking, the wind farm plays a crucial role in the local energy mix of the Kattegat region. Located between Djursland and Anholt island, the facility directly influences the power supply for the island of Anholt. A dedicated cable connects the wind farm to the island, effectively replacing most of the diesel-powered electricity that previously served the local population. This shift from fossil-fuel-based generation to wind power highlights the dual benefit of offshore infrastructure: contributing to the national grid while simultaneously decarbonizing remote or semi-isolated communities. The reduction in diesel dependency improves local air quality and stabilizes energy costs for residents of Anholt.

Comparison with Horns Rev 3

The significance of Anholt is further clarified when compared to other major Danish projects, such as Horns Rev 3. While Anholt held the title of Denmark’s largest offshore wind farm from 2013 to 2019, subsequent developments have expanded the country’s offshore capacity. Horns Rev 3, commissioned later, surpassed Anholt in terms of nameplate capacity, illustrating the continuous scaling of Danish offshore wind projects. This progression reflects the evolving strategy of Ørsted, the operator of the Anholt farm, which has consistently pushed the boundaries of offshore wind technology. The transition from Anholt to larger installations like Horns Rev 3 demonstrates the maturation of the sector, where economies of scale and improved turbine designs enable greater energy yields from similar geographic footprints.

How does the Anholt wind farm work?

The Anholt Offshore Wind Farm operates as a significant renewable energy infrastructure project in the Kattegat, utilizing wind as its primary energy source. The facility has a total nameplate capacity of 400 MW, managed by the operator Ørsted. Since its commissioning in 2013, the farm has played a critical role in Denmark’s offshore wind landscape, holding the title of the largest offshore wind farm in Denmark from 2013 to 2019.

Technical Specifications and Layout

The wind farm is situated between Djursland and Anholt island. The layout consists of multiple wind turbines arranged to capture wind energy efficiently across the designated sea area. Each turbine converts kinetic energy from the wind into electrical power, contributing to the aggregate 400 MW capacity. The specific turbine models and their individual ratings are integral to the farm’s overall output, though the collective capacity defines its scale relative to other global offshore installations.

Voltage Transformation and Cable Infrastructure

Electrical power generated at the turbine level undergoes voltage transformation before being transmitted to the onshore grid. The infrastructure includes subsea cables that connect the individual turbines to a central offshore substation. From there, a main export cable carries the electricity to the landfall. A notable feature of the cable infrastructure is its direct connection to Anholt island. This cable replaces most of the diesel-powered electricity previously used on the island, significantly enhancing the local energy mix and reducing reliance on fossil fuels.

Parameter Value
Entity Type Offshore Wind Farm
Primary Fuel/Source Wind
Country Denmark (DK)
Location Kattegat, between Djursland and Anholt island
Operator Ørsted
Commissioned 2013
Capacity 400 MW
Operational Status Operational
Notable Feature Cable to Anholt replaces most diesel-powered electricity

Operation and Maintenance

The Anholt Offshore Wind Farm has maintained continuous operational status since its initial commissioning in 2013. As an active asset in Denmark’s renewable energy portfolio, the facility is operated by Ørsted, which manages the day-to-day performance and maintenance of the 400 MW installation. The wind farm is situated in the Kattegat, positioned strategically between the mainland region of Djursland and the island of Anholt. This specific geographic placement is critical to the project’s engineering design, as it allows for efficient power transmission to both the Danish national grid and the local island infrastructure.

Power Supply to Anholt Island

A defining feature of the Anholt project is its direct impact on the energy mix of the nearby island of Anholt. Prior to the wind farm's integration, the island relied heavily on diesel-powered electricity generation for its local power supply. The construction of a dedicated submarine cable connecting the wind farm directly to Anholt has fundamentally altered this dynamic. This infrastructure upgrade replaces most of the diesel-powered electricity previously consumed on the island, significantly reducing local fuel dependency and emissions. The cable serves as a vital link, ensuring that a substantial portion of the wind-generated power is utilized locally before any surplus is fed into the broader regional grid.

Operational Significance

Since entering service in 2013, the Anholt Offshore Wind Farm has held significant standing within the global offshore wind sector. With a nameplate capacity of 400 MW, it is recognized as one of the largest offshore wind farms in the world. Within the domestic context, the facility held the title of the largest offshore wind farm in Denmark for a six-year period, from 2013 to 2019. This operational milestone underscores the scale of the investment and the technical capabilities required to maintain such a large renewable energy asset in the marine environment of the Kattegat. The continued operation of the 400 MW capacity contributes to the stability and growth of Denmark’s wind energy output, serving as a key reference point for subsequent offshore developments in the region.

Frequently asked questions

What is the total installed capacity of the Anholt Offshore Wind Farm?

The Anholt Offshore Wind Farm has a total installed capacity of 400 megawatts. This significant output makes it one of the larger offshore wind projects in Denmark, contributing substantially to the country's renewable energy mix.

Which company was responsible for commissioning the Anholt project?

The project was commissioned by Ørsted, a leading global energy company originally known as DONG Energy. Ørsted played a pivotal role in developing and bringing the wind farm online to serve the Danish power grid.

In which body of water is the Anholt Offshore Wind Farm located?

The wind farm is situated in the Kattegat, a strait connecting the Baltic Sea and the North Sea. It is positioned northeast of the island of Anholt, which gives the project its name.

When did the Anholt Offshore Wind Farm begin its commercial operation?

The Anholt Offshore Wind Farm was commissioned in 2013, marking the start of its contribution to Denmark's renewable energy infrastructure. This timeline places it among the earlier large-scale offshore wind developments in the region.

What type of energy source does the Anholt project utilize?

The Anholt project utilizes wind energy, specifically harnessing offshore winds to generate electricity. As an offshore wind farm, it uses large turbines positioned in the sea to capture wind power more efficiently than many onshore counterparts.

References

  1. "Anholt Offshore Wind Farm" on English Wikipedia
  2. Anholt Offshore Wind Farm - Global Energy Monitor
  3. Anholt Offshore Wind Farm - Orsted
  4. Offshore Wind - IEA
  5. Energy Mix - Energinet

See also