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Walney Wind Farm
Walney Wind Farm
Walney Wind Farm
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Wind farm layout

Key Information

Walney Wind Farms are a group of offshore wind farms 9 miles (14 km) west of Walney Island off the coast of Westmorland and Furness, England, in the Irish Sea. The group, operated by Ørsted[1] (formerly Dong Energy), consists of Walney Phase 1, Phase 2 and the Walney Extension. The extension has a capacity of 659 MW[2] and it was the world's second largest offshore wind farm in 2018.[2]

The wind farms were developed by Walney (UK) Offshore Windfarms Limited, a partnership between DONG Energy and Scottish and Southern Energy.[3] The farms, which are immediately northwest of the West of Duddon Sands Wind Farm and west of Ormonde Wind Farm, are in water depths ranging from 19m to 23m and cover an area of approximately 73 km2.

Both of the first phases have 51 turbines giving a nameplate capacity of 367 MW.[4] Until September 2012 it was the world's largest operational offshore wind farm, and regained this title when the expansion completed in September 2018.[5][2] The first two phases were expected to generate about 1,300 GW·h/year of electricity, with a load factor of 43%.[6][7] The Walney Extension opened in September 2018 with a further 87 turbines capable of generating 659 megawatts.[8] And the area reaches 145 km2.

Development phases

[edit]
Phase Offshore construction start Inaugurated Turbines Turbine model Total capacity (MW)
Walney 1[9] 2010 2011 51 Siemens SWT-3.6-107 (3.6 MW) 183.6
Walney 2[10] March 2011 March 2012 51 Siemens SWT-3.6-120 (3.6 MW) 183.6
Walney Extension[11] February 2017 June 2018 87 40 × MHI-Vestas 8.25 MW &
47 × Siemens Gamesa (7 MW)		 659
Total 189 1026.2

Construction

[edit]

In 2004 DONG Energy was awarded a 50-year lease from The Crown Estate to develop a wind farm off Walney Island, as part of the second UK offshore wind farm tendering process known as "Round 2".[12] The farm was constructed sequentially in two phases with overlapping installation activities to reduce the overall construction timeframe.

The project involved constructing the wind turbines and their foundations, building two offshore substations and installing two undersea power cables, one for each phase, and two short onshore cables to connect to two existing onshore electrical substations for connection into the UK National Grid. A cable was laid by Stemat Spirit. Phase 1 connects to a substation at Heysham and Phase 2 connects to substation at Stanah, south of Fleetwood. Both undersea cables pass close by Barrow Wind Farm. All the construction work was expected to take less than 2 years, with both phases operational by the end of 2011.[13] On 11 July 2011 Phase 1 became operational, comprising 51 turbines with an installed capacity of 183.6 MW.[14] Its levelised cost has been estimated at £120/MWh.[15]

Walney 2 began sending power to the grid on 1 November 2011. In February 2012, DONG Energy claimed to have installed the 51 turbines in Walney 2 in 5 months and 14 days, including monopiles and complete turbines; about 3.25 days per turbine. Walney 1 took 7 months. The improvement is due to commonality of projects and resources.[16] The wind farm was officially opened on 9 February 2012 by the new energy secretary, Ed Davey, MP,[5] although the last of the 51 turbines in Walney 2 were only activated in April 2012.[17]

Walney Extension

[edit]

In November 2014 DONG Energy was given development consent for an extension to the Walney offshore wind farm.[18] The development consent allowed a maximum of 207 turbines to be added to the existing 102 turbines.[18] The maximum generating capacity of the extension was said to be 750 MW although DONG was reported to be proceeding with a project based around 660 MW.[18] Offshore construction began in 2017, onshore support construction having started in 2015.[11] In 2015 DONG chose the 8 MW Vestas V164 for Phase 1,[19] and the 7 MW Siemens gearless turbine for Phase 2.[20] In April 2018, the final turbine of the 87 installed for Phase 1 was completed, with full operation commencing in September 2018.[21]

Incidents

[edit]

In 2014 a dive vessel, owned by Danish firm Offshore Marine Services, was carrying out routine inspection work when an anchor cable broke and the ship hit one of 102 turbines installed at the Walney Offshore Wind Farm. The UK’s Maritime and Coastguard Agency surveyed the crash site and reported that a surface sheen stretching 33 feet wide and 0.7 nautical miles long was trailing the vessel. The agency said that, unlike heavier crude oil, the marine engine oil should evaporate or disperse naturally.[22]

See also

[edit]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Walney Wind Farm

View on Grokipedia
from Grokipedia
The Walney Offshore Wind Farm is a major offshore wind energy project located in the , approximately 15–19 km west of the Cumbrian coast near , . It comprises the original Walney phases 1 and 2, which became fully operational in 2012 with 102 turbines and a combined capacity of 367 MW, and the Walney Extension, which added 87 turbines (40 MHI 8 MW and 47 7 MW) with 659 MW capacity upon its inauguration in September 2018. The entire complex spans about 218 km² and achieves a total installed capacity of 1,026 MW, sufficient to generate clean electricity for nearly 1 million households annually. Developed and primarily owned by Ørsted (formerly DONG Energy) in partnership with investors—including Greencoat Capital and PGGM for the original phases, and PFA, PKA (via AIP Management), and Brookfield (as of 2025) for the Extension—the project received its Development Consent Order from the government in 2014, enabling construction of the extension to commence in 2015. At the time of its completion, the Walney Extension held the distinction of being the world's largest operational offshore , a title it retained until surpassed by Ørsted's Hornsea One in 2020. The farm contributes significantly to the 's goals, supporting local employment with over 250 jobs during operations. It connects to the national grid via onshore substations in and is designed for an operational lifespan exceeding 25 years, with ongoing maintenance ensuring .

Overview and Location

Site Characteristics

The Walney Wind Farm is situated approximately 14 km west of in the , off the coast of in the district, . The original phases (Walney 1 and 2) occupy an area of about 73 km², while the extension (Walney Extension, comprising phases 3 and 4) occupies 145 km². This location in the East Irish Sea was selected for its favorable conditions, including consistent wind resources that support efficient energy generation. The site features shallow waters conducive to fixed-bottom turbine installations, with average depths around 25 m relative to mean low water springs across the development area, though the extension reaches up to 55 m in some northern sections. It lies about 19 km west of , facilitating logistical access during development. The seabed lease, granted by The Crown Estate under the UK's Round 2 offshore wind program, spans 50 years from 2004 and covers the combined array area. Tidal currents in the region exhibit an easterly flood and westerly to northwesterly ebb pattern, influencing but posing minimal disruption to the site's overall stability. Pre-development environmental surveys established a comprehensive baseline for the site's . Seabird assessments from 2002 to 2010, using aerial and boat-based methods, documented key species such as , , , and migratory birds like and pink-footed goose, focusing on flight heights and foraging behaviors. Marine mammal surveys identified , , and as prevalent, with studies evaluating potential noise sensitivities. Benthic habitat investigations revealed predominantly muddy sand and mud substrates, supporting diverse infaunal communities with negligible structural impacts anticipated from foundations covering less than 0.4% of the seabed. These surveys underscored the East Irish Sea's dynamic yet viable environment for offshore wind development.

Capacity and Components

The Walney Wind Farm complex has a total installed capacity of 1,026 MW, consisting of the original phases (Walney 1 and 2) with a combined 367 MW and the Walney Extension adding 659 MW. This scale enables the generation of clean sufficient to power nearly 1 million homes annually, with the original phases supporting around 320,000 homes and the extension nearly 600,000. The turbine array comprises 189 units in total. Walney 1 features 51 SWT-3.6-107 turbines, each with a 3.6 MW rating, while Walney 2 has an identical configuration of 51 such turbines, yielding 183.6 MW per phase. The Walney Extension incorporates more advanced models: 40 MHI V164-8.25 MW turbines and 47 SG 7.0-154 turbines rated at 7 MW each, optimizing output through larger rotor diameters and higher efficiency in offshore conditions. Supporting infrastructure includes two offshore substations for the extension, which step up voltage from 33 kV inter-array levels to 220 kV for export, alongside the original phases' substation handling 34 kV to 132 kV conversion. Undersea cabling totals over 220 km, encompassing inter-array connections and export routes of approximately 87 km for the original phases and 139 km for the extension, linking to onshore substations at and Stanah for integration into the National Grid at higher voltages.

Development and Planning

Initial Phases Planning

The development of Walney Wind Farm Phases 1 and 2 began in 2004, when DONG Energy (now Ørsted) was awarded a 50-year seabed lease by The Crown Estate as part of the UK's Round 2 offshore wind leasing program, which aimed to expand commercial-scale wind energy capacity in strategic sea areas. Feasibility studies conducted around this time evaluated local wind resources in the , confirming strong potential for generation of approximately 663 GWh annually per phase, while also addressing early grid integration requirements for connecting to the onshore network near . Planning consent for the project was granted by the Department for Business, Enterprise and Regulatory Reform (now part of the Department for Business, Energy & Industrial Strategy) in 2008, following a rigorous application process under the Round 2 framework that emphasized of offshore renewables. As part of the approval, comprehensive environmental impact assessments were required, evaluating potential effects on commercial fisheries—such as disruptions to potting and activities in —and safety, including risks to shipping routes and mitigation measures like guard vessels during construction. These assessments, initiated in 2007, incorporated stakeholder consultations with fishing organizations and maritime authorities to minimize cumulative impacts from multiple North West region wind farms. Financing the initial phases presented challenges due to the high of offshore projects in the mid-2000s, with total costs estimated at £1.0–1.2 billion for the 367 MW combined capacity; these were addressed through strategic equity partnerships that distributed risk and leveraged specialized investors. DONG Energy retained a 50.1% stake, while Scottish and Southern Energy (SSE) acquired a 25.1% share in December 2009 for approximately £39 million to support development and construction funding. A further 24.8% equity interest was sold to the , a of Dutch PGGM and Ampère Equity Fund, in December 2010 for £16 million, providing additional capital for turbine procurement and installation. Grid connection financing was bolstered by a £52 million loan from the () in 2011 for the Walney 1 transmission link, enabling secure integration into the national grid via high-voltage cables to .

Walney Extension Planning

The planning for the Walney Extension began in 2014, when DONG Energy (now Ørsted) sought development consent for an expansion adjacent to the existing Walney Wind Farm to leverage shared infrastructure and minimize new cabling requirements. The proposal targeted a site covering approximately 149 km² in the , about 19 km west of , , with an estimated generating capacity of up to 750 MW. On 7 November 2014, the UK for Energy and Climate Change granted the Development Consent Order (DCO) under the Planning Act 2008, authorizing construction, operation, and maintenance of the offshore generating station, associated transmission assets, and onshore works. The approvals process involved rigorous environmental impact assessments (EIAs) that evaluated cumulative effects with the operational Walney Phases 1 and 2, including potential interactions on marine ecology, , and commercial fisheries. Due to the site's proximity to the Isle of Man—within 15 km of its —extensive consultations were conducted with the Isle of Man Government, resulting in a Statement of Common Ground that addressed transboundary impacts and mitigation measures. Additional safeguards were incorporated for and , such as radar mitigation protocols to prevent interference with and guard zones for maritime safety, as recommended by the Planning Inspectorate following public examinations. Financing for the Walney Extension was secured through a led by Ørsted, which retained a 50% ownership stake, with the remaining equity held by AIP Management (representing PKA) and PFA Pension, each at approximately 25% following investments finalized in 2017. The project cost around £2 billion, supported by the UK's Contracts for Difference (CfD) scheme, under which it was one of the first offshore wind farms awarded a CfD in 2014 at £150 per MWh to ensure revenue stability amid market fluctuations. This financing structure built on the original Walney phases' planning successes, enabling scalable expansion without revisiting foundational policy hurdles.

Construction

Walney Phases 1 and 2

The construction of Walney Phases 1 and 2, developed by DONG Energy (now Ørsted), involved sequential installation activities to minimize overall project duration while adhering to planning consents granted in 2008. Phase 1 construction commenced in April 2010, with the installation of 51 monopile foundations beginning in the same month using jack-up vessels such as the Vagant and operated by GeoSea. These monopiles, each weighing approximately 550 tonnes and standing 56 metres tall, were driven into the seabed to support 3.6 MW turbines, with all foundations completed by August 2010. Turbine erection followed from July 2010 through May 2011, marking the progressive assembly of the 51-turbine array, and the phase achieved full operational status in July 2011. Phase 2 construction overlapped slightly with Phase 1 to optimize timelines, starting in April 2011 with monopile installation aboard the jack-up vessel Svanen, which completed all 51 foundations by 2011. Inter-array and cables were laid using specialized vessels to connect the turbines to onshore , ensuring efficient from the site. The phase reached completion in December 2011, entering commercial operation shortly thereafter and bringing the combined Phases 1 and 2 capacity to 367.2 MW. Throughout both phases, nearly 6,000 workers contributed to the onshore and offshore efforts, supported by a new £2 million maintenance facility at port, which facilitated logistics and employed around 60 staff for ongoing operations. Construction faced challenges from the harsh environment, including weather-related delays due to high winds and waves that periodically halted commissioning and installation activities, particularly during Phase 2. These conditions required adaptive scheduling and robust vessel designs to maintain progress. Additionally, coordination with the nearby Barrow Offshore , operational since 2006, involved shared use of Barrow port facilities for material staging and vessel mobilization, ensuring minimal disruption to existing infrastructure while integrating the new phases into the regional grid network.

Walney Extension Build

Construction of the Walney Extension offshore wind farm commenced in February 2017, with offshore works focusing on the installation of 87 monopile foundations in water depths ranging from 24 to 32 meters. These foundations, each consisting of a single steel monopile driven into the seabed, were fully installed by August 2017, utilizing specialized vessels such as the jack-up installation vessel for pile driving and the heavy-lift vessel Svanen for positioning. The project leveraged the proximity to the existing Walney Phases 1 and 2 to streamline , including sequential installation phases that allowed for overlapping activities to minimize and coordinate with ongoing of the adjacent operational farm. Turbine installation followed in late 2017 and continued through 2018, deploying 40 V164-8.0 MW turbines and 47 SWT-7.0-154 7 MW turbines. Heavy-lift vessels, including the , transported and installed the larger rotors and nacelles, enabling efficient handling of components weighing up to 700 tons. The construction also involved laying over 300 kilometers of inter-array and export cables, including approximately 80 kilometers of high-voltage export cables connecting the two offshore substations to the onshore grid at . This expanded the farm's cabling infrastructure by an additional 50 kilometers beyond the original phases, enhancing connectivity while adhering to measures during burial. The supported around 250 local jobs during peak construction and engaged over 50 regional suppliers, from manufacturing in Hull to cabling services in , fostering development in northwest . First power generation occurred in 2017, with full grid connection achieved by June 2018, allowing the farm to reach operational capacity ahead of its official inauguration on 6 2018. These innovations in scale and phased installation not only reduced overall timelines but also set precedents for future large-scale offshore developments by demonstrating efficient integration with existing .

Operations and Impact

Technical Operations

The Walney Wind Farm is operated and maintained by Ørsted from its base in , , with 24/7 remote monitoring and control center services ensuring real-time oversight of turbine performance and grid output. Scheduled and unscheduled activities are conducted annually using service operation vessels to access the offshore turbines for inspections, repairs, and blade servicing. These operations support over 250 direct jobs in the local region and emphasize through systems to minimize downtime. The wind farm has an expected operational lifespan of 25 years, after which repowering—replacing turbines with higher-capacity models—or lifetime extensions could extend its productivity, aligning with industry practices for offshore assets. As of , no major repowering has occurred, but ongoing operations and (O&M) optimizations, including for efficiency improvements, continue to enhance reliability and yield. In terms of performance, the facility achieves an average of 40-45%, reflecting effective utilization of resources in the . Based on its total 1,026 MW capacity and prevailing conditions, the annual electricity output is estimated at approximately 3.6 TWh, sufficient to power over 1.2 million homes. Power generated is integrated into the national grid through 400 kV onshore connections at the substation, enabling efficient transmission with minimal losses. The combined Walney phases represent one of the largest operational offshore complexes globally, following major projects like Hornsea 2.

Environmental and Economic Effects

The Walney Wind Farm significantly contributes to environmental sustainability by generating that displaces fossil fuel-based electricity production, thereby reducing emissions by approximately 1.5 million tonnes annually across its full capacity. This offset supports the UK's broader efforts to mitigate through clean power equivalent to the needs of over 1.2 million households. Ongoing bird and marine monitoring programs have been implemented to assess ecological impacts, including boat-based surveys for avian species and benthic assessments to track changes in behavior and distribution. These efforts, conducted pre-, during, and post-construction, have informed strategies without identifying major disruptions to migratory patterns or populations. The wind farm's structures, particularly turbine foundations, create an artificial reef effect that enhances local populations by providing new and shelter, potentially increasing and supporting spillover to adjacent areas. Post-construction studies indicate no significant long-term habitat disruption, with benthic communities showing resilience and recovery following initial disturbances. Economically, the Walney Wind Farm has delivered over £5.1 million in community funding since 2016, supporting more than 276 projects in and focused on local environmental and social initiatives (as of 2024). This includes an annual allocation of approximately £600,000 over the project's 25-year operational life, fostering and development. The facility sustains around 250 direct jobs in operations and maintenance at the Barrow-in-Furness base, bolstering the regional workforce in sectors. Additionally, it has engaged over 50 local suppliers, contributing to growth and injecting capital into the offshore industry. As of 2025, community funding continues unabated, aligning the wind farm's outputs with the 's net-zero emissions target by 2050 through sustained renewable generation. Recent studies on wake effects with nearby farms highlight minor energy yield reductions, prompting collaborative assessments to optimize regional resource utilization, including government-backed solutions for disputes involving upstream projects.

Incidents and Challenges

Safety Incidents

One significant safety incident occurred at the Walney Offshore Wind Farm site. On March 1, , 26-year-old Latvian motorman Aleksejs Kuznecovs fell from deck 10 (the Monkey Island) to deck 5 of the floating accommodation vessel MS Wind Perfection, sustaining severe that caused his death upon impact with a base. The inquest held in County Hall, , recorded an , determining the cause of the fall as unknown, with no evidence of foul play or external factors such as a ship-wide . In 2014, Ørsted (then DONG Energy) implemented enhanced safety measures, including making the "Safety Leadership Onboarding" course mandatory for all new managers to strengthen oversight and in offshore operations. The company also collaborated with the G+ Global Offshore Wind Health and Safety Organisation to develop 10 life-saving rules for employees and contractors, emphasizing and safe work at height in offshore environments. These updates align with UK (HSE) guidelines for offshore wind projects, which mandate rigorous risk assessments for working at height and vessel operations. Earlier in the construction phase, from to , minor injuries were reported during turbine lifting and installation activities, though specific details remain limited in . Following the commissioning of the Walney Extension in , no major incidents involving personnel have been reported as of 2025, reflecting improved industry-wide safety trends with a 13% decline in high-risk offshore wind events that year.

Environmental Incidents

One notable environmental incident at the Walney Wind Farm occurred on August 14, 2014, when the multi-service vessel OMS Pollux, operated by Offshore Marine Services, collided with a turbine foundation pile during dive support operations. The impact damaged the vessel's port-side fuel tank, resulting in a diesel oil leak at an initial rate of approximately 10 liters per minute, forming a light surface sheen about 1 km in length. Liverpool Coastguard coordinated the response, and temporary repairs halted the leak; the oil dispersed naturally with no reported shoreline contamination or impacts on wildlife, as confirmed by local authority surveys. A multi-agency Environment Group investigated the event, but no prosecutions followed. During construction and cable installation phases from 2010 to 2018, minor sediment disturbances occurred due to seabed works, including trenching and burial of inter-array and export cables. These activities temporarily increased suspended sediment levels in the vicinity, potentially affecting local benthic habitats, but environmental impact assessments (EIAs) predicted and monitored such effects, deeming them negligible to minor in magnitude with rapid natural recovery expected. Ongoing post-construction surveys confirmed no long-term adverse changes to sediment quality or marine ecology attributable to these operations. To mitigate pollution risks, the Walney Wind Farm operators implemented oil spill contingency plans and emergency response protocols prior to , including measures for rapid containment and dispersion modeling. These plans align with regulatory requirements under the Walney Extension Offshore Wind Farm Order 2014, emphasizing prevention of hydraulic fluids, lubricants, and fuels from turbines and vessels entering the marine environment. Complementing these, regular marine environmental surveys continue to monitor benthic recovery and , integrating findings into broader operational management. As of November 2025, no significant environmental incidents have been reported at the site.

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