Global wind energy is entering a period of rapid expansion. New capacity additions reached 72.2 GW in the first half of 2025, a 63.7 percent jump compared with the same period in 2024. Total installed global wind power capacity now stands at 1,245 GW, according to the Global Wind Energy Council. 

The construction and delivery of these projects rely on companies with deep engineering experience, strong supply chains, and the ability to manage complex projects. The largest wind farm construction companies in the world, which head these developments, are Iberdrola, NextEra Energy, Ørsted, RWE Renewables, Vattenfall, SSE Renewables, and EDF Renewables.

In this article, we explore the top 7 wind farm construction companies in the world according to installed capacity. Also, we’ll understand the crucial role of each wind farm developer in transforming the global energy mix.

Top 7 Wind Farm Construction Companies in the World (By Installed Capacity)

Iberdrola

Iberdrola is the largest wind farm construction and development company globally, with a portfolio of 23 GW. The company’s flagship operational assets include East Anglia ONE in the UK (714 MW), Baltic Eagle and Wikinger in Germany - one of the largest wind farms in Germany (826 MW combined), and the 496 MW Saint-Brieuc project in France. Together, these form a strong base of more than 2.4 GW of installed offshore capacity as of late 2025.

Offshore wind has become one of Iberdrola’s fastest-growing business areas. The company plans to add 3.5 GW of new offshore capacity between 2025 and 2028, backed by EUR 8 billion in global investment. Central to this growth is the East Anglia Hub in the United Kingdom (a four-project complex exceeding 3.9 GW) alongside major pipelines in the United States, Germany, Japan, and Australia.

Upcoming wind projects of Iberdrola:

NextEra Energy

NextEra Energy is the largest electric utility holding company in the world and one of the most active wind farm builders in North America. The company entered the sector in 2001 when it began operations at the Stateline Wind Energy Center in Oregon and Washington.

Stateline became the largest wind farm in the world at the time and marked the company’s fourteenth wind site. The portfolio has expanded steadily since then and now includes more than 160 operating wind sites across the United States.

NextEra continues to grow its market position through a huge development pipeline. The company plans to add between 9.0 GW and 11.5 GW of new wind capacity from 2024 to 2027. Wind generation represented 63 percent of its net capacity in 2024, which was included in the company’s long-term strategy.

Ørsted

Ørsted is the largest offshore wind construction company in the world, which built the first offshore wind farm in 1991 and continues to lead the sector with 10.2 GW of offshore capacity in operation across Europe, the United States, and Asia. Hornsea 2 in the UK by Ørsted is the biggest offshore wind farm in the world. Ørsted has also expanded its U.S. presence through projects such as Revolution Wind, Sunrise Wind, and the South Fork wind farm installation off the East Coast.

The company’s portfolio shows ongoing investment in new capacity. Another 8.1 GW of offshore wind is under construction, including Borkum Riffgrund 3 in Germany and the Greater Changhua projects in Taiwan. Ørsted also maintains a growing onshore business, operating 3.8 GW across the U.S. and Europe. 

Projects such as the Helena Energy Center in Texas demonstrate interest in hybrid solutions combining wind and solar. The company continues to expand its pipeline by securing new sites in markets such as Ireland and Scotland.

Upcoming Ørsted offshore wind farm projects:

RWE renewables

RWE is one of the largest wind farm development companies in the world, which develops, constructs, and operates onshore and offshore wind farms across more than 15 countries in Europe, the Americas, and the Asia-Pacific region. Its portfolio includes 19 operational offshore wind farms and more than 6.5 GW of onshore wind capacity. Long-term experience supports this growth.

RWE has spent more than two decades building and running offshore wind sites, and today it operates more than 9 GW of installed renewable capacity worldwide. The company is expanding its position through one of the most ambitious offshore pipelines in the sector. More than 4 GW of new offshore capacity is under construction in Europe, including major projects such as the 1.4 GW Sofia wind farm in the UK and the 1.1 GW Thor project in Denmark.

RWE is also building the 1.6 GW Nordseecluster off the coast of Germany and the 795 MW OranjeWind project in the Netherlands. The company plans to triple its offshore wind capacity from 3.3 GW to 10 GW by 2030, with further development expected in key markets across Europe, North America, and Asia-Pacific.

Upcoming offshore wind farm projects in RWE:

Vattenfall

Vattenfall is a major European wind developer and one of the leading builders of offshore wind farms in the region. The company operates more than 1,400 turbines with a combined capacity of 6.6 GW, and its portfolio includes large sites such as Hollandse Kust Zuid in the Netherlands, Kriegers Flak in Denmark, and Pen y Cymoedd in the UK. 

Hollandse Kust Zuid is notable as the world’s first non-subsidised offshore wind farm and supplies enough electricity for around 1.5 million Dutch households. Vattenfall also operates integrated hybrid parks that combine wind, solar, and battery storage, including the Haringvliet facility in the Netherlands.

The company is preparing for a new phase of expansion as it works toward a fossil-free energy system by 2030. Offshore wind remains the central focus, supported by major projects now in planning or construction. The Nordlicht 1 and 2 clusters in Germany will form the largest offshore wind farm in the country when completed, with construction starting in 2026 and operations expected in 2028.

Upcoming wind farm projects of Vattenfall:

SSE Renewables

SSE Renewables is one of the most active wind construction companies in the UK and Ireland, with a portfolio that spans onshore, offshore, and hydropower assets. The company operates around 4 GW of renewable capacity across 67 wind farms and hydro sites.

Its offshore programme is anchored by the Dogger Bank Wind Farm, a 3.6 GW project in the UK North Sea that will become the largest offshore wind farm in the world once completed. The first phase produced power in 2023, marking a major milestone for a project built with some of the world’s largest wind turbines.

The company is preparing to scale further through a development pipeline that now exceeds 9 GW, the largest secured offshore pipeline in the UK and Ireland. Key projects include the proposed 4.1 GW Berwick Bank development in Scotland, the 800 MW Arklow Bank Phase 2 offshore site in Ireland, and new infrastructure supporting major onshore projects such as the Viking Wind Farm in Shetland.

Upcoming SSE Renewables wind farm projects:

EDF Renewables

EDF Renewables is a major global builder and operator of wind power, with a portfolio that spans Europe, North America, India, and Africa. Wind energy accounts for 87 percent of the company’s installed capacity. In North America, the company has delivered or contracted more than 12 GW of wind projects, including 1,228 MW in Quebec.

In India, EDF Renewables manages a 569 MW wind portfolio with new projects such as the Rajpur and Kabini wind farms under construction. South Africa is another area of expansion, where the company is building 1.2 GW of new renewable capacity, including 763 MW of wind through the Koruson cluster and associated projects.

Upcoming EDF wind farm projects:

Conclusion

Wind farm construction companies are central to the global shift toward clean power. Their projects, investments, and long-term development pipelines will determine how quickly the world can scale wind capacity to meet climate targets.

The companies highlighted in this article, ranging from Iberdrola’s multigigawatt East Anglia Hub, Ørsted’s global offshore fleet, RWE’s expanding European build-out, and Vattenfall’s Nordlicht cluster, to NextEra Energy’s North American portfolio, SSE Renewables’ record-setting Dogger Bank project, and EDF Renewables’ growing presence in India and South Africa, represent the technical and financial strength driving today’s market.

Together, these developers are delivering some of the world’s largest offshore and onshore wind farms and are building the capacity needed for long-term system decarbonisation. Their combined work contributes directly to the growth that pushed total global wind capacity to 1,245 GW by mid-2025. Continued expansion will be essential if the world is to close the gap identified by GWEC and move toward the 2030 goals.

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