Overview

The North Hoyle Offshore Wind Farm is located in the Irish Sea off the North Wales coast. It is Wales' first offshore wind farm. The project was developed by NWP Offshore Ltd and is now owned by Greencoat UK Wind PLC. The construction of the wind farm started in April 2003 and commissioned in November 2003.

The first major offshore renewable power project in UK has a total installed capacity of 60 MW. It comprises 30 wind turbines, each capable of producing up to 2 MW. The wind farm has the capacity to supply electricity to approximately 40,000 homes annually in the towns of Rhyl and Prestatyn.

North Hoyle wind farm plays a crucial role in mitigating climate change by offsetting around 160,000 tonnes of carbon dioxide emissions each year. The offshore wind farm managed by RWE Renewables demonstrates the potential of offshore wind power in the UK.

Project Background

The North Hoyle Offshore Wind Farm's development indicated the larger shift in the UK's energy policy towards renewable sources. This change was driven by the need to combat climate change and reduce dependency on imported energy. Initial site investigations for the North Hoyle wind project began in the summer of 1999.

In April 2001, the project received a Development Licence from the Crown Estate and the Department for Trade and Industry (DTI). Public consultation for North Hoyle commenced in July 2001, and the Consent Application was submitted in February 2002. All necessary consents had been secured, and construction was started in October 2002.

In the autumn of 2002, following a competitive bidding process, the design-and-build contract was awarded to the North Hoyle Consortium, comprising Vestas Celtic Wind Turbines and Mayflower Energy.

Onshore construction of the project began in November 2002, followed by offshore construction in April 2003. The wind farm achieved its first official electricity generation in mid-November 2003 and it became fully operational by April 2004. 

The North Hoyle project was part of the UK's first round of 18 offshore wind sites announced in early 2001. This project marked the beginning of large-scale offshore wind energy production and also set the standard for future developments of the offshore wind market in the UK.

Project Location Details

North Hoyle offshore wind farm is situated 7–8 km off the North Wales coast, Liverpool bay. The water depth is 7–11 m in site with a tidal range of 8 m. It covers an area of 10 sq. km with the offshore wind turbines spaced 800m east-west and 350m north-south.

Project cost

The estimated project cost for the development of North Hoyle Offshore Wind Farm is GBP 80 million. 

For the long-term economic viability, the levelized cost of energy (LCOE) for the wind farm has been set at GBP 77/MWh. The power generated is sold to RWE Generation UK under a power purchase agreement (PPA) at a rate of USD 0.091/kWh. 

Technical Specifications

The North Hoyle Offshore Wind Farm utilizes 30 Vestas V80-2.0 MW wind turbines. Each turbine has a nameplate capacity of 2 megawatts with a total installed offshore wind capacity of 60 MW. These turbines feature a three-bladed rotor with a diameter of 80 meters and a hub height of 70 meters. 

The Vestas V80 turbines are equipped with the OptiSpeed system. These turbine model allows variable rotor speeds between 10 and 20.7 RPM. The OptiTip pitch regulation system is another technology used in wind turbine to optimize blade angles for maximum efficiency in varying wind speed. 

The wind turbines in UK waters are supported by monopile foundations, designed and engineered by LIC Engineering AIS. These steel piles have an outer diameter of 4.2 meters and an average length of 50 meters. They have different penetration depths depending on the site-specific soil conditions.

The subsea cables are designed to interconnect the turbines and connect the wind farm to the local grid. These cables are constructed with copper power conductors, fiber optic communication links, and steel armor for enhanced durability. These cables link the turbines to an onshore substation (national grid) equipped with a 90 MVA main transformer.

Contractors Involved

Project Benefits

The North Hoyle Offshore Wind Farm benefited the local community economically and socially. npower Renewables established a community fund that provides GBP 60,000 annually to support community-led projects in Rhyl and Prestatyn. 

The wind farm boosted the local supply chain by creating demand for local services, materials, and expertise throughout the project's development and operational phases. The project enhanced the UK's offshore wind industry by setting base for large-scale offshore wind developments.

Project Timeline

Current and Future Outlook

In February 2024, MPI Adventure undertook essential maintenance operations at two locations within the wind farm, which lasted 14 days. Decommissioning is expected to occur within the next 5 to 10 years of its operational life.

Summary

The commissioning of the North Hoyle Offshore Wind Farm as the UK's first major offshore wind project highlights the growing prominence of the renewable energy sector in the country. The 60 MW wind farm provides clean energy to approximately 40,000 homes annually with its Vestas V80-2.0 MW turbines. Over its operational life, North Hoyle has made contributions to reducing carbon emissions, supporting the local economy, and advancing the UK's renewable energy goals.

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