Short answer
The biggest clean energy companies are not always the same companies. Size can mean renewable power capacity, clean electricity generation, equipment shipments, battery sales, market value or project pipeline. Based on recent public annual reports and energy agency data available in 2026, large names include State Power Investment Corporation and China Energy Investment Corporation in China; Enel, Iberdrola, NextEra Energy Resources, China Three Gorges and Ørsted in renewable power; and Vestas, JinkoSolar, LONGi, Trinasolar, CATL and Tesla in the equipment and storage supply chain.
This comparison focuses on operating scale rather than stock performance. It also separates power producers from manufacturers, because a company that owns 60 GW of renewable assets is not directly comparable with a company that ships 86 GW of solar modules or sells hundreds of GWh of batteries. For more sector context, see our clean energy coverage.
Why biggest depends on the metric
Searches for the biggest clean energy companies often combine several business models into one list. That can be helpful for a quick scan, but it can also hide important differences. A renewable utility owns or operates wind, solar, hydro, geothermal or storage assets. A solar manufacturer sells modules to project developers. A wind turbine company supplies equipment but usually does not own most of the wind farms using its machines. A battery company may serve electric vehicles, grid storage and industrial systems at the same time.
For a clearer industry comparison, this article uses three practical measures:
- Generation ownership or operation: installed renewable capacity, clean energy capacity or annual renewable generation.
- Technology supply: solar module shipments, cumulative turbine installations or battery sales.
- Strategic influence: geographic reach, grid integration, offshore wind leadership, storage scale and exposure to fast-growing markets.
The result is not a single investment ranking. It is a map of companies that are large in different parts of the clean energy system. The source base includes 2025 annual reports, SEC filings, company sustainability reports, China’s National Energy Administration and International Energy Agency analysis published or available in 2026.
Large renewable power owners and developers
The most direct way to define large clean energy companies is to look at power capacity. Even then, the numbers need careful reading. Some companies report gross capacity, some report net ownership capacity, and some include storage or jointly managed assets. Chinese state-owned groups can also have very large clean energy portfolios while still owning major fossil-fuel operations.
| Company | Main clean energy role | Recent scale indicator | How to read it |
|---|---|---|---|
| State Power Investment Corporation | Chinese power generation group | 199 million kW of clean energy capacity as of August 2025, according to a SASAC update | One of the clearest examples of very large clean power capacity inside a diversified state-owned utility |
| China Energy Investment Corporation | Large Chinese energy group with wind power scale | Its official profile says it was the world’s largest wind power enterprise by the end of 2025 | Important for wind scale, but not a pure-play clean energy company because it is also deeply involved in coal and thermal power |
| Enel and Enel Green Power | Global utility and renewable power operator | 61.9 GW of net efficient consolidated renewable capacity and 128.06 TWh of consolidated renewable generation in 2025 | A major listed utility where renewables account for a large share of generation capacity |
| Iberdrola | Global power utility focused on grids and renewables | More than 46,000 MW of renewable capacity and more than 88,000 GWh of renewable output in 2025 | Large in wind, hydro, solar and grids, with major exposure to Europe, the United States and Latin America |
| NextEra Energy Resources | U.S.-focused renewable and storage developer | At December 31, 2025, it operated about 27,855 MW of wind and 12,794 MW of solar facilities, with about 5,177 MW of net battery storage ownership | One of the largest U.S. platforms for contracted wind, solar and battery projects |
| China Three Gorges Corporation | Hydropower and renewable energy group | Its 2024 social responsibility report listed 61.04 GW of total renewable energy installed capacity and 7.05 GW of offshore wind | Hydropower gives the group a distinctive clean electricity profile, while newer growth includes wind and solar |
| Ørsted | Offshore wind and renewable developer | Its 2025 annual report showed 10.2 GW of installed offshore capacity and 6.3 GW of installed onshore capacity | Smaller than diversified giants by total GW, but highly significant in offshore wind specialization |
China’s domestic market explains why Chinese groups appear so prominently. China’s National Energy Administration reported that China reached 2.34 billion kW of renewable power capacity by the end of 2025, including 1.2 billion kW of solar and 640 million kW of wind. The IEA also reported that China accounted for more than 60% of global renewable capacity additions in 2025. That market scale creates unusually large utilities, developers and supply-chain companies.
Equipment companies that make the build-out possible
Some of the biggest clean energy companies do not primarily sell electricity. They manufacture the equipment that turns policy targets and power purchase agreements into operating assets. For these companies, shipments and installed base are more useful scale indicators than generation capacity.
Vestas remains one of the most important wind technology suppliers. In its 2025 annual report, Vestas said it reached 201 GW of wind turbine installations globally across 88 countries by the end of 2025. It also reported 14,537 MW of turbine deliveries and 16,292 MW of order intake during the year. That makes Vestas a scale leader in wind equipment, even though most electricity from its turbines is produced by customers, not by Vestas itself.
JinkoSolar and LONGi show the scale of solar manufacturing. JinkoSolar reported annual solar module shipments of 86,056 MW for 2025. LONGi reported module shipments of 86.58 GW and external cell shipments of 4.31 GW in 2025. These figures show why annual module shipments can exceed the entire installed renewable fleet of many utilities.
Trinasolar is another major solar and storage company. Its 2025 sustainability reporting said cumulative PV module shipments exceeded 320 GW by the end of 2025. Cumulative data is different from annual shipments, but it is useful for understanding long-term market presence and global project reach.
CATL is central to batteries, which are increasingly important to clean energy because solar and wind output varies by time of day and weather. CATL’s 2025 annual report summary said lithium-ion battery sales rose to 661 GWh, and the company described itself as maintaining the world’s largest power battery market share based on SNE Research data. Tesla is also important in storage; its 2025 Form 10-K reported 46.7 GWh of energy storage product deployments. CATL and Tesla are not directly comparable, because CATL is mainly a battery supplier while Tesla combines vehicles, storage hardware, software and energy services.
What the comparison reveals about the clean energy market
The first lesson is that scale has shifted toward Asia, especially China, in both project deployment and manufacturing. China’s wind and solar additions in 2025 were so large that any global ranking that ignores Chinese utilities and manufacturers would be incomplete. This does not mean every Chinese company is a pure clean energy company. It means the country’s deployment volume and industrial base are too large to treat as a side note.
The second lesson is that Europe still has globally important clean energy utilities. Enel, Iberdrola and Ørsted show three different models: a diversified multinational utility, a grids-and-renewables platform, and a more focused offshore wind developer. Their scale is not only measured in gigawatts. It also includes regulated networks, project finance experience, offshore engineering capabilities and power-market exposure. See also: EVs.
The third lesson is that the United States has fewer national renewable champions by number, but very large platforms in specific segments. NextEra Energy Resources is especially significant in utility-scale wind, solar and storage. Tesla is a major name in energy storage deployments, even though its broader corporate identity is still heavily tied to electric vehicles.
The fourth lesson is that clean energy growth is no longer only about generation. Battery storage, grid connection, digital controls, financing structures and permitting can decide whether renewable capacity produces reliable value. A solar module company, a wind turbine supplier and a battery manufacturer may therefore be as important to the energy transition as a project owner.
How to read company scale without overstating it
A list of the biggest clean energy companies should not be read as a list of the cleanest companies. Some large utilities still own thermal power assets. Some manufacturers face intense price competition, trade restrictions and supply-chain scrutiny. Some offshore wind developers have had to deal with cost inflation, contract renegotiations and project impairments. Size can create resilience, but it can also create complexity.
Capacity numbers also need context. One gigawatt of solar does not produce the same annual electricity as one gigawatt of offshore wind, hydro or nuclear power. A battery measured in MW describes power output, while GWh describes stored energy or annual shipments. Gross capacity can include joint ventures; net capacity counts the company’s ownership share. These accounting differences explain why public rankings often disagree.
Readers should also separate historical scale from future momentum. Vestas reaching more than 200 GW of cumulative installations is a measure of installed base. JinkoSolar and LONGi shipping more than 86 GW of modules in 2025 is a measure of one-year manufacturing volume. Enel’s 61.9 GW of consolidated renewable capacity is an operating-asset measure. CATL’s 661 GWh of battery sales is a product-sales measure. All are large, but they describe different kinds of market power.
Companies to watch by category
For a practical industry view, it is better to group companies by their role:
- Large clean power groups: State Power Investment Corporation, China Energy Investment, China Three Gorges, Enel, Iberdrola and NextEra Energy Resources.
- Offshore wind specialists: Ørsted remains a key name because of its offshore operating history, although its recent financial performance shows how difficult the sector can be.
- Wind technology suppliers: Vestas is a major benchmark because of its large cumulative installed turbine base and global service footprint.
- Solar manufacturing leaders: JinkoSolar, LONGi and Trinasolar stand out through very large shipment or cumulative deployment figures.
- Battery and storage leaders: CATL and Tesla are major names, while the broader storage supply chain also includes inverter, software, project-development and grid-service companies.
The most useful conclusion is that there is no single winner across clean energy. The sector is now too broad for one ranking to explain it. The biggest clean energy companies are best understood as a network of asset owners, manufacturers, developers, grid operators and storage providers that together determine how fast renewable electricity can scale.
Frequently asked questions
What is the biggest clean energy company in the world?
There is no universally accepted single answer. By clean power capacity, Chinese state-owned groups such as State Power Investment Corporation are extremely large. By listed utility renewable capacity, Enel and Iberdrola are major global names. By wind turbine installed base, Vestas is a leading supplier. By lithium-ion battery sales, CATL is one of the largest companies in the sector.
Why are solar companies ranked differently from utilities?
Solar manufacturers are usually ranked by module shipments, cell capacity or revenue. Utilities are ranked by installed generation capacity, annual electricity output or customer base. A manufacturer may ship tens of gigawatts in one year without owning the projects that use those modules.
Are the biggest clean energy companies all pure renewable companies?
No. Some of the largest companies by clean energy capacity also own natural gas, coal, nuclear, grid or retail power businesses. That is why this article distinguishes clean energy scale from overall corporate purity.
Which segment is growing fastest?
Solar PV and battery storage are among the fastest-scaling parts of the market, while wind remains essential for diversified renewable supply. The exact growth rate varies by region, grid conditions, permitting rules, interest rates and policy support.
