California is home to myriad renewable energy companies that are ushering in a transition from the traditional fossil fuel-based energy industry to one relying on clean, renewable sources such as wind, solar, and hydroelectric power. These companies, ranging from startups to established players, are making significant strides in creating affordable and efficient solutions for residential and commercial users. Offerings include solar panel installations, wind energy solutions, and even battery storage for excess power. As the battle against climate change intensifies, the sector’s potential continues to grow, promising a future where Californians will comfortably rely on renewable energy.


Top 20 renewable energy companies in California

1. Sunrun

  • Website: sunrun.com
  • Headquarters: San Francisco, California, United States
  • Founded: 2007
  • Headcount: 10001+
  • Latest funding type: Post Ipo Debt
  • LinkedIn

Sunrun is a solar company that offers solar energy solutions to residential customers. They have provided solar to over 550,000 customers nationwide, saving them over $600 million on their utility bills.


2. SolarCity

  • Website: solarcity.com
  • Headquarters: San Mateo, California, United States
  • Founded: 2006
  • Headcount: 10001+
  • LinkedIn

SolarCity offers solar energy solutions to residential and commercial customers, providing clean and sustainable power. Their services include installation, financing, and maintenance of solar panels.


3. EDF Renewables North America

  • Website: edf-re.com
  • Headquarters: San Diego, California, United States
  • Founded: 1987
  • Headcount: 1001-5000
  • Latest funding type: Series Unknown
  • LinkedIn

EDF Renewables is a market-leading, independent power producer and service provider, specializing in wind and solar photovoltaic energy, storage, and electrical vehicle charging. They are committed to providing future generations with sustainable and responsible energy solutions.


4. Clearway Energy Group

  • Website: clearwayenergygroup.com
  • Headquarters: San Francisco, California, United States
  • Founded: 2018
  • Headcount: 501-1000
  • Latest funding type: Secondary Market
  • LinkedIn

Clearway Energy Group is a leading provider of clean power generated by solar and wind across the US. They own and operate utility-scale wind and solar assets, community solar projects, and distributed solar projects. Their vision is to create a world powered by clean energy, and they work with customers, partners, and affiliates to accelerate the transition to a clean energy future.


5. Greentech Renewables San Diego

CED Greentech is a leading solar distributor in San Diego, offering a wide range of cutting-edge solar and wind technology solutions. They provide high-quality products and services across the renewable energy and energy efficiency industries. With a strong emphasis on customer service, CED Greentech is committed to helping businesses in California and beyond reduce their energy costs and transition to sustainable energy sources. They offer comprehensive project support, including system design, material procurement, and project management.


6. Borrego

  • Website: borregoenergy.com
  • Headquarters: San Diego, California, United States
  • Founded: 1980
  • Headcount: 201-500
  • Latest funding type: Grant
  • LinkedIn

Borrego Energy is a clean energy company that offers locally-generated wind energy to residential, commercial, and industrial customers. They aim to provide affordable and sustainable electricity through small-scale wind projects. By leasing land from local farmers and installing 1-2 wind turbines, Borrego Energy helps communities achieve energy independence while supporting the state's renewable energy goals.


7. Inspire

  • Website: inspirecleanenergy.com
  • Headquarters: Santa Monica, California, United States
  • Founded: 2014
  • Headcount: 51-200
  • Latest funding type: Acquired
  • LinkedIn

Inspire Clean Energy is a company dedicated to transforming consumer access to clean energy and accelerating a net-zero carbon future. They offer clean energy plans for homes, providing 100% renewable energy. With their plans, customers can power a brighter world and make a positive impact on the environment. Inspire Clean Energy aims to provide clean energy solutions to those in critical need, making a difference in the fight against climate change.


8. Talesun Solar USA Ltd.

  • Website: talesunusa.com
  • Headquarters: San Jose, California, United States
  • Founded: 2009
  • Headcount: 1001-5000
  • LinkedIn

Talesun USA LLC is a company that specializes in producing solar panels and wind turbines for commercial and residential use.


9. GroundWork Renewables

  • Website: grndwork.com
  • Headquarters: Sand City, California, United States
  • Founded: 2009
  • Headcount: 51-200
  • LinkedIn

GroundWork is a company specializing in MET (Meteorological Equipment) services for the solar industry. They offer a wide range of high-performance equipment and measurement systems, including Spectrally Flat Class A MET, Bifacial Resource Assessment, PV Soiling Measurement System, and Array Packages. GroundWork is known for its expertise in the field and its partnerships with Sandia National Laboratories and CFV Labs. They provide solutions for developers, EPCs (Engineering, Procurement, and Construction companies), and owner/operators in the solar sector.


10. GCube Insurance

  • Website: gcube-insurance.com
  • Headquarters: Newport Beach, California, United States
  • Founded: 1987
  • Headcount: 51-200
  • Latest funding type: Debt Financing
  • LinkedIn

GCube is a specialist provider of insurance services for utility-scale renewable energy projects worldwide. With over 25 years of experience, we help wind, solar, wave, tidal, hydro, and energy storage asset owners identify, quantify, and mitigate risk efficiently and cost-effectively.


11. BEI Construction, Inc.

BEI Construction, Inc. is a commercial construction company specializing in electrical and technology infrastructure. They offer services such as solar installations, energy storage projects, CNG fueling facilities, and biomass power stations. With expertise in audio/visual capabilities and full-service design/build projects, they provide exceptional work and value to their clients.


12. Global Energy Monitor

Global Energy Monitor (GEM) is a data-driven organization that provides information and analysis on energy projects and industries worldwide. It offers trackers for coal plants, coal mines, coal terminals, solar power, wind power, hydropower, geothermal power, bioenergy power, nuclear power, oil and gas extraction, oil infrastructure, and gas infrastructure. GEM's data enables informed decision-making and supports global efforts towards a transition to clean and sustainable energy sources.


13. WECS Renewables

WECS Renewables is a leading company in the renewable energy sector, dedicated to developing innovative and sustainable solutions. They offer a wide range of products and services in the field of renewable energy, including wind turbines, solar panels, and energy management systems.


14. Coldwell Solar Inc.

Coldwell Solar is a leading family-owned solar company in California, specializing in the installation and maintenance of solar energy systems. With over 200 megawatts installed, we assist agricultural and commercial customers in achieving energy cost savings. We also partner with public and private entities to develop utility-scale solar energy systems. Our financing options include lease-to-own, Power Purchase Agreement (PPA), financed purchases, or cash purchases.


15. Primergy Solar

  • Website: primergysolar.com
  • Headquarters: Oakland, California, United States
  • Founded: 2019
  • Headcount: 11-50
  • Latest funding type: Debt Financing
  • LinkedIn

Primergy Solar develops, builds, owns, and operates energy storage and solar projects across North America. We partner with people who understand that investing in projects that increase clean power reliability, reduce carbon emissions, and promote energy independence leads to healthier communities and strong economies.


16. Cleantech Law Partners

Cleantech Law Partners (cleantechlaw.com) is a renewable energy law firm specializing in project development, project finance, corporate and securities, mergers and acquisitions, and intellectual property law. They offer legal expertise in the emerging markets of clean technology, including solar, wind, biogas, geothermal power, and electric vehicles. With a focus on energy efficiency and energy storage, they provide comprehensive legal solutions to clients in the renewable energy industry.


17. 3 Phases Renewables

3 Phases Renewables is a leading supplier of comprehensive renewable energy solutions, offering direct access to green energy, renewable energy certificates, distributed energy solutions, and wholesale market products and services.


18. Power Efficiency Corporation

Power Efficiency is a company focused on promoting and implementing energy-efficient solutions for homes and businesses. They offer a range of products and services aimed at reducing energy consumption and helping customers save money while minimizing their environmental impact. With a strong emphasis on sustainability and green technology, Power Efficiency strives to be a leading player in the energy efficiency industry.


19. WattTime.org

  • Website: watttime.org
  • Headquarters: Oakland, California, United States
  • Founded: 2014
  • Headcount: 11-50
  • Latest funding type: Grant
  • LinkedIn

WattTime is an environmental tech nonprofit that empowers all people, companies, policymakers, and countries to slash emissions and choose cleaner energy.


20. Geothermic Solution Inc.

Geothermic Solution offers patented deep rock, high temperature GeoHeat™ Harvesting Technology for competitively priced, baseload, renewable energy.


Want to find more renewable energy companies?


If you want to find more companies that offer a variety of clean energy solutions, including solar energy products and services, wind energy production, and electric vehicle charging solutions you can do so with Inven. This list was built with Inven and there are hundreds of companies like these globally.


With Inven you'll also get to know the company's:


  • Ownership: Which of these are private equity backed? Which are family-owned?
  • Contact data: Who are the owners and CEO's? What are their emails and phone numbers?
  • Financials: How do these companies perform financially? What are their revenues and profit margins?

...and a lot more!