Largest Renewable Energy Construction Companies

Global grids added more than 600 GW of utility‑scale solar, onshore and offshore wind, and battery storage in 2025–2026 — an all‑time high. The heavy lifting falls to renewable energy construction companies and EPC contractors that turn project pipelines into operating assets. We’ve ranked the ten largest renewable energy construction companies by total completed capacity, based on public project disclosures through the first quarter of 2026.

Methodology

What the Ranking Covers

The list includes companies that self‑perform engineering, procurement, and construction for utility‑scale solar PV, onshore wind, offshore wind, and battery energy storage systems (BESS). Repowering and brownfield redevelopments count at their final nameplate capacity. Pure asset owners that outsource EPC work are excluded.

Data Sources and Verification

We cross‑checked public project databases, corporate filings, and government energy registries. A common mistake is treating announced or under‑construction capacity as commissioned; this ranking only counts commercially operational assets as of Q1 2026. If you are screening partners for a specific country, start with firms that have active local subsidiaries — the largest global renewable energy construction companies almost always operate through in‑country entities that handle permitting and construction logistics.

Largest Renewable Energy Construction Companies – Top 10 Profiles

The Global Leaders

Enel Green Power (Rome, est. 2008) tops the list with 57 GW built. Hydro accounts for 28 GW, onshore wind for 15 GW, and utility‑scale solar PV for 10 GW. The storage fleet sits at 600 MW / 1,400 MWh operational, with another 3.2 GWh under construction. The 306 MW Roadrunner Solar Facility in Texas wasn’t about scale — it proved that hybrid renewable‑storage designs work at utility scale and became a blueprint for later behind‑the‑meter and front‑of‑the‑meter configurations worldwide.

Iberdrola (Bilbao, est. 1992) reports more than 56 GW of renewable capacity, making it the world’s largest 100 % renewable utility by generation. Wind dominates at 23 GW (roughly two‑thirds onshore), with 15 GW of solar PV and 13 GW of hydro. BESS assets have reached 1.2 GW / 2.8 GWh. The company has repowered over 2 GW of older onshore wind in Spain and the United States, and its 714 MW East Anglia ONE offshore wind farm off the UK coast was one of the earliest large‑scale offshore builds for a utility of its size.

China Three Gorges Renewables (Group) Co., Ltd. (Beijing, est. 2010) is the clean‑energy arm of China Three Gorges Corporation. It has constructed 47 GW: 30 GW onshore wind, 17 GW utility‑scale solar, and a 3 GW / 12 GWh BESS portfolio integrated with its wind‑solar hybrid bases. The 8 GW Ulanqab Wind‑Solar‑Storage Project in Inner Mongolia remains one of the largest integrated clean‑energy complexes ever delivered.

NextEra Energy Resources (Juno Beach, Florida, est. 1998) is the world’s largest generator of wind and solar energy, with 32 GW completed. The mix breaks down as 24 GW of onshore wind, 8 GW of solar PV, and 2.5 GWh of BESS in operation. The 485 MW Blythe Solar Energy Center in California pairs PV with storage at a single site. A steady programme of brownfield repowering helped push total clean capacity past the 30 GW mark in 2024.

Ørsted (Fredericia, Denmark; renewables focus from 2006) has constructed 15.7 GW of offshore wind — the largest dedicated offshore wind portfolio globally — along with 2 GW of onshore wind and 1.2 GWh of BESS. Hornsea 3, a 2.9 GW offshore wind farm in UK waters, is the company’s largest project to date. Ørsted’s legacy goes deeper: Vindeby, commissioned in 1991 as the world’s first offshore wind farm, set the direction the entire industry would follow.

EDF Renewables (Paris, est. 1999) operates as a global EPC and developer with 14 GW completed. Onshore and offshore wind claim 12 GW, solar PV 2 GW, and battery storage 1 GW / 2.3 GWh, much of it backed by long‑term PPAs with commercial and industrial offtakers. The 1.2 GW Neart na Gaoithe offshore wind farm off Scotland’s east coast is a flagship project. In 2025, the company became the first developer to fully commission France’s initial round of offshore wind farms.

Vattenfall (Stockholm, roots to 1909) has delivered 13 GW of renewable capacity: 4 GW onshore wind, 3 GW offshore wind, 6 GW hydro, 2 GW solar, and 1 GWh of BESS. The 1.5 GW Hollandse Kust Zuid offshore wind farm in the Netherlands, completed in 2024, stands as one of the world’s largest subsidy‑free offshore farms. Vattenfall’s long‑stated goal of fossil‑free living within a generation has shaped how it diversifies across asset classes.

RWE Renewables (Essen, formed 2021) scaled its EPC‑led construction rapidly to 10 GW of realised capacity. The portfolio comprises 7 GW onshore wind, 2.5 GW offshore wind, 3 GW solar PV, and 1.5 GWh of battery storage, often deployed on repowered brownfield sites. The 1.4 GW Sofia offshore wind farm in UK waters is a key project. The merger of RWE’s and E.ON’s renewable assets cemented its place among Europe’s largest clean‑energy contractors.

Pattern Energy Group (San Francisco, est. 2009) specialises in large‑scale wind and transmission projects across the Americas, with 10.5 GW completed. Onshore wind accounts for 7 GW, solar PV for 2 GW, and BESS for 1.5 GWh, together with the 3,000‑MW SunZia transmission line linking New Mexico to Arizona. The 1,050 MW Western Spirit Wind project in New Mexico illustrates its integrated EPC and offtake model. Securing over $10 billion in green financing in a single year for its construction pipeline marked a defining moment.

SSE Renewables (Perth, UK, part of SSE plc since 1998) has completed 5 GW of renewable capacity, with another 10 GW in construction and pre‑construction. The operational portfolio splits into 2 GW onshore wind, 2.5 GW offshore wind, 1.5 GW of hydro and pumped storage, and 0.5 GWh of battery storage, often linked to favourable PPAs. The Dogger Bank Wind Farm, a 3.6 GW project off Yorkshire being built in phases, is its most ambitious undertaking. Winning the first UK offshore wind contract without government subsidy cemented SSE Renewables’ position in competitive tenders.

Top Five Companies by Key Metrics

The table below stacks the top five by total megawatts, asset‑class split, and storage. Use it as a screening tool — a company with a smaller total MW tally but a bigger storage or offshore pipeline may look very different on a forward‑looking basis.

Rank	Company	Total MW Constructed	Solar MW	Wind MW (Onshore+Offshore)	Storage MWh	Year Founded	Headquarters
1	Enel Green Power	57,000	10,000	15,000	1,400 (operational)	2008	Rome, Italy
2	Iberdrola	56,000	15,000	23,000	2,800	1992	Bilbao, Spain
3	China Three Gorges Renewables	47,000	17,000	30,000	12,000	2010	Beijing, China
4	NextEra Energy Resources	32,000	8,000	24,000	2,500	1998	Juno Beach, USA
5	Ørsted	17,700	–	17,700 (15,700 offshore)	1,200	2006	Fredericia, Denmark

A company with a smaller total MW tally but higher storage or offshore exposure may be a stronger strategic fit for certain portfolios. Always weigh future pipeline alongside historical delivery.

How to Pick the Right Renewable Energy Construction Partner

Selecting a construction firm for a utility‑scale renewable project isn’t just about total gigawatts built. The right partner matches your technology scope, geography, and contracting preferences.

When an Integrated Developer‑EPC Makes Sense

If you lack in‑house design or permitting resources, an integrated developer‑EPC can take a project from site origination through commissioning. These renewable energy construction companies bundle development, finance, and construction under one roof, reducing interface risk. For offshore wind or complex hybrid projects, stick with contractors that have completed at least two 500 MW+ projects in your market.

Red Flags to Watch for in EPC Proposals

• A low bid that excludes grid‑connection scope or long‑lead equipment.
• No evidence of completed projects in the target country’s permitting regime.
• Overly optimistic timelines that ignore local supply chain bottlenecks.

Quick‑Check Evaluation Table

Use the table below to compare candidates when you’ve shortlisted several renewable energy construction companies.

Evaluation Factor	What to Look For
Completed capacity in the region	At least 200 MW of commissioned projects in the same grid interconnection zone
Storage integration experience	Installed BESS capacity showing ability to manage hybrid dispatch
Financial health & parent backing	Investment‑grade credit rating or a history of completing projects through cycles
Indigenous supply chain plans	Documented partnerships with local turbine, module or balance‑of‑plant suppliers
Commissioning track record	Percentage of projects completed on time and within the last 24 months

Treat this checklist as a starting point; a formal technical and commercial evaluation should always follow.

FAQ

What is a renewable energy construction company?
A renewable energy construction company handles the engineering, procurement, and construction (EPC) of utility‑scale wind, solar, and battery storage projects. Many of these firms also develop projects — securing land, permits, and offtake agreements before building the asset for themselves or an owner‑operator.

How can developers locate EPC contractors in a specific region?
Start with completed project registries maintained by the country’s energy regulator or grid operator; these list the construction firms that delivered each plant. Industry directories and renewable energy trade associations supplement that data with regional specialisation filters.

Which companies build battery storage projects?
All the top‑profiled renewable energy construction companies install battery storage alongside generation or on a standalone basis. Although pure‑play storage developers like Fluence construct BESS, the largest storage volumes come from integrated firms with in‑house EPC teams.

What is the difference between a developer and an EPC?
A developer handles site selection, permits, and offtake arrangements. An EPC contractor executes the engineering, procurement, and physical construction. Many large renewable energy construction companies combine both roles, offering a full turnkey service.

How are these rankings determined?
The ranking uses total commissioned megawatts across solar, wind, and battery storage as of Q1 2026, sourced from publicly available project portfolios. Repowered assets and brownfield redevelopments are included at their final nameplate capacity.

Conclusion

These rankings reflect the most current data available for 2026 and will be refreshed annually. The free spreadsheet includes the full 50‑company list with project counts and geographic coverage — designed for developers, investors, and market researchers conducting due diligence or partner screening.

Data Block

Download the complete, free spreadsheet of the 50 largest renewable energy construction companies worldwide — with firm‑level project counts, capacity splits, and geographic coverage — intended for developers, investors, and market researchers conducting due diligence or partner screening.