Offshore wind is growing faster than expected and the world now has 83 GW of installed capacity, enough to power 73 million households. Yet, this is only a small slice of a resource that the World Bank estimates at 71,000 GW of potential wind capacity around the world. The IEA says global offshore wind potential could meet today’s electricity demand 18 times over, showing the capability of the sector.

The largest offshore wind farm companies driving this momentum include Ørsted, Iberdrola, RWE, Equinor, and SSE Renewables, along with fast-advancing Chinese developers such as CTG and SPIC. These firms shape the global market by influencing auctions, supply chains, and the pace of large-scale deployment across Europe, China, Asia, and the United States.

This article ranks the Top 10 Largest Offshore Wind Companies in the World in 2025. It highlights their operating wind farm with future development pipelines and explains how each developer is positioning itself in a market that continues to expand.

List of the Largest Offshore Wind Farm Developers in the World

Ørsted A/S

Ørsted remains the largest offshore wind farm developer in the world. The company operates 10.2 GW of installed offshore capacity across Europe, the US, and the Asia-Pacific region. Its portfolio continues to expand as 8.1 GW is under construction.

Hornsea 2 by Ørsted A/S in the UK stands as the world’s largest operating offshore wind farm. It uses 165 turbines across 462 square kilometres in the North Sea. Each 200-metre-tall turbine can power a typical British home for nearly 40 hours per rotation. The company developed largest offshore wind farm in Taiwan - Formosa 1.

Ørsted is building Borkum Riffgrund 3 in the German North Sea, which will become Germany’s largest offshore wind farm once completed. The company also launched Osonic, a new technology platform focused on low-noise solutions for offshore construction. Ørsted signed its first preferred supplier deal for Osonic with Luxcara.

In the United States, the company plans to complete Sunrise Wind in the second half of 2027. Work has resumed on Revolution Wind after a court lifted a federal work-stop order. Ørsted expects the project to begin operations in the second half of 2026.

Ørsted offshore wind farm portfolio by country:

Vattenfall

Vattenfall ranks among Europe’s largest offshore wind companies and remains a central player in Northern Europe’s energy transition. The company develops and operates offshore projects across Sweden, Germany, the Netherlands, Denmark, and the United Kingdom. Its long-term strategy focuses on expanding renewable power to support a fossil-free future.

In Germany, Vattenfall is building Nordlicht 1 and 2, located about 85 kilometres north of Borkum. The project is scheduled to become Germany’s largest offshore wind development once completed in 2028. In Sweden, the company has secured all major permits for the 1.2 GW Kattegat Syd project. Vattenfall is also advancing Poseidon, a floating offshore wind initiative in the southern Skagerrak.

The Netherlands remains a key market. Vattenfall recently commissioned Hollandse Kust Zuid, the world’s first subsidy-free offshore wind farm. The project can supply enough electricity for about 1.5 million Dutch households. The company also operates several projects in UK waters, including sites in the Thames Estuary and the Aberdeen Offshore Wind Farm.

Vattenfall offshore wind farm portfolio by country:

RWE Renewables

RWE is one of the most experienced offshore wind companies in the world and largest wind developer company in UK. The company has spent more than two decades developing, constructing, and operating offshore wind farms across Europe. Its current portfolio includes 19 operating sites, and construction is underway on several major projects that will add more than 4 GW of new capacity.

The next phase of RWE’s growth is defined by large-scale developments. Sofia, a 1.4 GW project off the British coast, is among the most significant offshore wind farms currently being built in Europe. Thor in Denmark will add another 1.1 GW once completed. In Germany, the company is advancing the 1.6 GW Nordseecluster north of Juist. RWE is also building OranjeWind in the Netherlands in partnership with TotalEnergies. The project will add 795 MW of capacity.

RWE aims to triple its global offshore wind capacity from 3.3 GW today to 10 GW by 2030. The company is preparing for additional auctions and new projects across Europe, the United States, and the Asia-Pacific region. Recent achievements include bringing Triton Knoll in the UK and Kaskasi in Germany into operation.

RWE offshore wind farm portfolio by country:

SSE Renewables

SSE Renewables is one of the largest offshore wind project developers in the UK and Irish waters. The company began with the 25 MW Arklow Bank project in the Irish Sea and has since grown into a major offshore wind developer and operator. More than 2.5 GW of offshore capacity has been delivered through joint venture projects such as Greater Gabbard, Beatrice, and Seagreen, all of which SSE operates on behalf of its partners.

Seagreen is now Scotland’s largest offshore wind farm and the world’s deepest fixed-bottom site. SSE is also leading the construction of Dogger Bank. At 3.6 GW across three phases, it is the world’s largest offshore wind farm currently being built. The project uses GE’s Haliade-X turbines, among the most powerful turbines in operation today.

The company holds more than 9 GW of secured offshore capacity in the UK and Ireland, including floating wind through the Ossian project and large fixed-bottom sites such as Berwick Bank.

SSE Renewables offshore wind farm portfolio by country:

Iberdrola (Avangrid)

Iberdrola is one of the world’s largest offshore wind developers and continues to scale its presence across Europe, the United States, and new global markets. Through its U.S. subsidiary Avangrid, the company plays a central role in the expansion of American offshore wind with projects in Massachusetts, the mid-Atlantic, and the Gulf of Maine.

In the United States, Vineyard Wind 1 is the country’s first large-scale commercial offshore wind farm. The project will supply electricity to more than 400,000 homes and businesses in Massachusetts once fully commissioned. Iberdrola is also developing New England Wind 1 and 2, which together will deliver 1,870 MW and provide power for nearly one million households. 

Kitty Hawk, a major project for Virginia and North Carolina, has the potential to add 3,500 MW. Avangrid also holds two lease areas in the Gulf of Maine for floating wind development with an estimated capacity of 3,000 MW.

Iberdrola already operates a strong offshore fleet in the UK, Germany, and France, and it is expanding rapidly. The company expects about 4,800 MW of new offshore capacity to be operational by 2026.

Iberdrola offshore wind farm portfolio by country:

EDF Renewables

EDF Renewables, now operating under the brand EDF Power Solutions, is a major offshore wind farm developer, active across Europe, North America, and Asia. Its portfolio combines fixed-bottom and floating wind technologies, reflecting a strategy aimed at deep-water innovation and large-scale market expansion.

The company operates several commercial wind farms in the UK, France, Belgium, and Denmark, including France’s first offshore wind farm at Saint-Nazaire. EDF is also an early mover in floating technology with the Provence Grand Large pilot project.

In addition to its operational fleet, EDF is building and developing a substantial pipeline including Neart na Gaoithe (NnG) in Scotland, multiple French offshore zones, large-scale projects in Ireland, the U.S. (Atlantic Shores), South Korea, and Norway, and over 10 GW of early-stage opportunities in Brazil tied to green hydrogen ambitions.

EDF Renewables offshore wind farm portfolio by country:

Equinor ASA

Equinor is one of the largest and innovative offshore wind farm developers with the world’s first floating offshore wind farm - Hywind. Equinor’s operational portfolio now includes about 779 MW of gross offshore wind capacity, with an equity share of roughly 568 MW. These are spread across fixed-bottom and floating assets in the UK, Norway, and Germany.

Hywind changed the industry’s expectation, delivering a 54% capacity factor and powering 36,000 UK homes. Alongside this breakthrough, Equinor established a solid fixed-bottom footprint in British waters. Sheringham Shoal and Dudgeon, both located off the Norfolk coast, supply more than 700,000 homes combined.

In Germany, Equinor holds a stake in Arkona, a 385 MW project in the Baltic Sea that has been generating power since 2019. It supplies electricity to 400,000 households. Equinor, together with SSE Renewables and Vårgrønn, is developing the largest offshore wind farm in the world, spread across three 1.2 GW phases. Once fully operational, it will supply clean electricity to six million British homes. Phase A is already exporting electricity.

In Poland, the company is a key partner in the emerging offshore sector, holding interests in all three Bałtyk wind development zones. In South Korea, it is pushing the boundaries of floating wind through two major projects: the 200 MW Donghae floating development and Bandibuli (Firefly), a floating wind farm of up to 750 MW.

In Japan, Equinor is set for long-term offshore wind expansion, while in Australia, the company has teamed up with Oceanex Energy and Nexsphere to pursue new offshore wind opportunities following its 2023 market entry.

Equinor’s offshore wind farm portfolio by country:

Northland Power Inc.

Northland Power has one of the largest offshore wind farm development pipelines among the active offshore wind developers globally. Offshore wind accounts for 8.5 GW of its 12 GW global growth and construction pipeline. Its flagship projects include the 1 GW Hai Long offshore wind farm in Taiwan, developed with Mitsui & Co. and Gentari, which delivered first power in 2025 and is progressing toward full commercial operations in 2027.

In Poland, the Baltic Power project developed jointly with Orlen has been advancing rapidly, with turbine and substation installation already underway and full operation expected later this decade. In Asia, the company is expanding through strong partnerships, targeting up to 5 GW of offshore wind in Taiwan and South Korea alone, including future Round 3 Taiwan opportunities. 

In Europe, Northland is pushing further into large utility-scale projects, from the 1.1 GW Baltic Power development to a 2.3 GW ScotWind lease in Scotland. The company is also co-developing a 1.3 GW cluster in Germany with RWE.

State Power Investment Corporation (SPIC)

SPIC is one of China’s largest renewable energy developers, with 35 GW of total wind capacity (onshore + offshore) as of August 2025. Its offshore wind portfolio is expanding quickly, driven by large parity-priced projects, quality-recognized developments in Jiangsu and Guangdong, and early innovation in floating wind-solar hybrid systems.

The company has at least 1.5 GW of confirmed installed offshore wind capacity from fully operational projects. SPIC’s offshore wind ambitions sit within a broader clean-energy strategy: the company aims for 60% clean energy by 2025, rising to 75% by 2035.

Its flagship asset, the 1.5 GW South U project, reached full operation in October 2024 and stands as China’s largest single-parity offshore wind project in service. SPIC is also advancing major developments in Guangdong and Liaoning, including the 900 MW Xuwen project and the Huayuankou project in Dalian.

The company is further exploring emerging technologies through China’s earliest floating wind-solar hybrid demonstration, now operating at pilot scale and targeting expansion to 20 MW.

SPCI’s offshore wind portfolio across China:

China Three Gorges Corporation (CTG)

China Three Gorges Corporation (CTG) has established itself as one of the world’s biggest offshore wind developers. Through its renewable energy arm, CTGR, the company operates multi-gigawatt offshore wind clusters across Guangdong, Jiangsu, and Fujian, including the 1.7 GW Yangjiang Shapa complex, China’s first gigawatt-scale offshore wind farm, and several far-shore projects supported by advanced converter station technology.

CTG is also at the forefront of turbine engineering. In 2024, it unveiled the world’s largest offshore wind turbine, a 26 MW unit, and continues to expand its floating wind capabilities with China’s first self-developed large-scale floating turbine.

Conclusion

Offshore wind is entering a crucial decade as annual installations are expected to double in 2025 and triple by 2027. The industry is expected to pass 30 GW of yearly additions in 2030 and reach 55 GW by 2034. These milestones still fall short of the 2,000 GW that IRENA says the world needs by mid-century to stay close to a 1.5°C pathway, but the trajectory remains upward.

The developers featured in this ranking, from European leaders to China’s state-owned giants, will define how quickly new markets mature and how costs evolve. Their projects are pushing into deeper waters, introducing larger turbines and opening new offshore zones across Asia and the Americas. Their decisions in the next decade will play a major role in determining how much of offshore wind’s potential the world actually captures.

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