As the world accelerates its transition toward clean energy, sustainable and renewable energy companies are stepping into the spotlight like never before. In 2025, some of the biggest names in the industry are not only driving innovation but also reshaping the future of electricity through solar, wind, hydro, and next-generation technologies. From multinational giants to specialized renewable leaders, these companies stand at the forefront of the global energy revolution.
Below, we highlight the Top 10 Companies in Sustainable and Renewable Energy 2025, based on revenue performance, market cap, international presence, and commitment to a carbon-neutral future.
1. Iberdrola SA (IBDRY)
With revenues of €55.41 billion ($64.42 billion) and a market cap exceeding €104.24 billion ($121.2 billion), Iberdrola SA continues to dominate the renewable energy sector. Headquartered in Spain, this multinational electric utility company has firmly established itself as a global pioneer in clean energy.
Iberdrola’s diversified portfolio includes onshore and offshore wind, hydroelectric storage, solar photovoltaic, and battery storage solutions. Its international operations span across the U.S., U.K., Spain, Mexico, Brazil, and extend to Portugal, Greece, and Australia. By focusing on large-scale investments in green infrastructure, Iberdrola has positioned itself as a leader in sustainable electrification for both developed and emerging markets.
2. GE Vernova (GEV)
Born from the spin-off of General Electric’s energy division in 2024, GE Vernova is already making waves with a staggering $35.71 billion in revenue and a market cap of $136.81 billion. The company’s one-year trailing return of nearly 185% underscores its rapid rise in the renewable sector.
GE Vernova has anchored its mission around electricity and decarbonization, offering innovative solutions in wind, solar, hydro, gas, and energy storage. The company is targeting full carbon neutrality in operations by 2030, reflecting its ambition to balance reliability, affordability, and sustainability in power generation. Its strong presence on the New York Stock Exchange makes it one of the most closely watched renewable energy players in 2025.
3. NextEra Energy (NEE)
As one of the largest wind and solar power producers in the world, NextEra Energy has built a reputation for scaling renewable solutions with profitability. With revenues of $25.27 billion and net income of $5.51 billion, the company boasts a market cap of $146.64 billion.
NextEra operates across wholesale power generation and plant management, catering to municipal providers, corporations, and cooperatives. Its diversified portfolio includes not only renewables but also nuclear and natural gas, ensuring energy stability alongside clean energy growth. The company’s multi-billion-dollar investments in renewables keep it at the forefront of the U.S. energy transition.
4. Constellation Energy Corp. (CEG)
Baltimore-based Constellation Energy has emerged as the largest carbon-free energy producer in the United States. With a revenue base of $24.2 billion and net income of $2.98 billion, the company enjoys a strong market cap of over $100 billion.
Constellation provides energy solutions to residential, business, and public sector clients, with offerings spanning nuclear, natural gas, and electricity. Its dedication to clean generation has resulted in significant growth, reflected in a 45.18% one-year trailing return as of mid-2025. Positioned as a dependable energy provider, Constellation is spearheading America’s clean power transformation.
5. Vestas Wind Systems A/S (VWDRY)
Based in Denmark, Vestas Wind Systems remains one of the world’s most recognized names in wind energy. Despite financial challenges in 2025, with revenues of DKK 18.08 billion ($2.82 billion) and a one-year return decline of -42.71%, Vestas continues to lead in wind turbine manufacturing and installation.
The company has installed turbines across dozens of countries and sustains a robust service segment offering spare parts, maintenance, and long-term service contracts. Vestas’ expertise in wind engineering positions it as a critical player in the global shift toward renewable energy, even as it navigates turbulent market conditions.
6. Jinko Solar Holding Co. Ltd. (JKS)
Jinko Solar, headquartered in China, is one of the largest solar module manufacturers globally, boasting revenues of $83.06 billion across over 200 countries. Despite recent losses, with net income at – $1.87 million, the company maintains a strong position due to its scale and innovation in silicon ingots, wafers, solar cells, and modules.
The company also offers solar system integration services, making it a complete solutions provider for large-scale solar projects. Jinko Solar’s wide international reach, combined with its manufacturing capabilities, ensures its continued influence in global solar adoption despite fluctuating profitability.
7. Canadian Solar Inc. (CSIQ)
Canada-based Canadian Solar has carved out a niche as both a manufacturer and operator of solar projects. With revenues of $5.86 billion, the company serves more than 160 countries. While it reported a net loss of $10 million in 2025, Canadian Solar’s diversified offerings — from solar PV modules to project development and maintenance services — give it resilience in a competitive market.
The company’s ability to design, install, and manage solar projects at scale ensures its continued relevance as solar energy demand accelerates worldwide. Its global reputation and engineering expertise make Canadian Solar one of the top renewable leaders to watch.
8. Brookfield Renewable Corp. (BEPC)
Headquartered in Canada, Brookfield Renewable Corp. is a diversified renewable powerhouse, generating $3.92 billion in revenue from its extensive global portfolio. Its market cap stands at $5.87 billion, and it recorded a 15.42% one-year return in 2025.
Brookfield operates across hydroelectric, wind, solar, distributed generation, and storage assets, with hydroelectric remaining its cornerstone. Its global reach and multi-pronged approach give it the flexibility to balance traditional and emerging renewable energy solutions, making it a strong force in international sustainability efforts.
9. Algonquin Power & Utilities Corp. (AQN)
Algonquin Power & Utilities, based in Oakville, Ontario, combines regulated utility services with renewable energy operations. With revenues of $2.45 billion and a consumer base of 1.2 million across North America, the company has established itself as a reliable provider of essential services.
Through its operating business, Liberty, Algonquin supplies electricity, natural gas, and water, while also investing heavily in renewable power. Despite reporting a net income loss of – $1.21 billion, the company continues to expand its global asset base, which is valued at over $12.7 billion.
10. Daqo New Energy Corp. (DQ)
China-based Daqo New Energy Corp. specializes in producing high-purity polysilicon, a critical material for the solar PV industry. With revenues of $737.68 million, Daqo positions itself as one of the world’s low-cost polysilicon producers, serving the growing solar manufacturing ecosystem.
The company operates with a production capacity of 305,000 metric tons, supporting global demand for solar wafers and cells. Despite reporting a significant net loss of – $432.52 million, Daqo remains influential in solar supply chains as one of the few large-scale polysilicon producers in the world.
Outlook
The year 2025 underscores the urgency and opportunity within renewable energy. From wind and solar leaders like Vestas and NextEra to hydropower specialists like Brookfield Renewable, these companies are shaping the clean energy future. While some face profitability challenges, their collective efforts are driving innovation, creating jobs, and laying the foundation for a sustainable global economy.
As governments, corporations, and investors rally behind net-zero goals, the top companies in renewable energy will not only play a vital role in reducing carbon footprints but also define the next era of economic growth.
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