The renewable energy sector in California is a dynamic and rapidly blooming industry focused on sustainable energy sources such as solar, wind, and hydropower. Companies range from large corporations to nimble startups, all working to meet the state's ambitious clean energy targets. This thriving sector emphasizes innovation, often developing advanced technologies that not only generate power but also enhance efficiency through energy storage solutions. With increasing investment opportunities and a push from consumers for greener options, the industry is positioning itself for exponential growth, underpinned by a commitment to reduce emissions and combat climate change.

In this listing, you will find a mix of 20 Californian renewable energy companies. They vary in size from small teams to extensive operations, with headquarters spanning cities like San Francisco, Los Angeles, and San Diego. Founded from the late 1980s to 2017, these companies specialize in diverse areas, including solar and wind energy, battery storage, and clean energy consulting. Their collective focus is on enabling a sustainable energy future, catering to both residential and commercial sectors, and addressing climate impacts efficiently.

Continue reading to discover California's top renewable energy companies.

Top 20 Renewable Energy Companies in California

1. Pattern Energy

• Website: patternenergy.com
• Ownership type: Corporate
• Headquarters: San Francisco, California, United States (USA)
• Employee distribution: United States (USA) 92%, Canada 7%
• Latest funding: December 2024
• Founded year: 2012
• Headcount: 501-1000
• LinkedIn: pattern-energy

Pattern Energy Group LP, based in San Francisco, California, is a corporate entity that specializes in renewable energy. Founded in 2012, the company develops, constructs, owns, and operates utility-scale wind and solar power facilities primarily across North America. With a workforce of around 702 employees, Pattern Energy is dedicated to providing sustainable energy solutions to utility companies and businesses, facilitating their transition from fossil fuels to renewable energy sources. The company boasts a global development portfolio of 29 GW and operates approximately 30 facilities with a total installed capacity of about 6 GW. Their projects not only contribute to energy production but also aim to foster local economic growth through job creation and community partnerships. Pattern Energy's focus on transparency, accountability, and respect for local cultures underscores their commitment to responsible energy development.

2. 8minute Solar Energy

• Website: 8minute.com
• Ownership type: Private
• Headquarters: Los Angeles, California, United States (USA)
• Founded year: 2009
• Headcount: 51-200
• LinkedIn: 8minute

8minute Solar Energy, now operating under the name Avantus, is a private clean energy company based in Los Angeles, California. Founded in 2009, Avantus specializes in renewable energy solutions, particularly solar power and energy storage. The company serves utilities and organizations by providing innovative energy products and services tailored to meet various energy needs. Avantus is committed to delivering reliable and affordable clean energy while actively addressing climate change through its extensive project pipeline. With a workforce of approximately 177 employees, Avantus has developed a significant portfolio of solar projects, including some of the largest solar and energy storage facilities in the United States. Their focus on smart power plants integrates renewable energy production and storage, allowing for flexible and predictable energy output. This innovative approach not only enhances the efficiency of energy delivery but also positions Avantus as a key player in the transition to a sustainable energy future.

3. Inspire

• Website: inspirecleanenergy.com
• Ownership type: Corporate
• Headquarters: Santa Monica, California, United States (USA)
• Employee distribution: United States (USA) 96%, India 4%
• Latest funding: July 2021
• Founded year: 2014
• Headcount: 51-200
• LinkedIn: helloinspire

Inspire Clean Energy, based in Santa Monica, California, is a renewable energy provider that specializes in delivering 100% clean energy solutions to residential customers. Founded in 2014, the company sources its energy from wind, solar, and hydropower generators, aiming to significantly reduce carbon emissions and promote sustainability. Inspire operates by purchasing renewable energy on behalf of its members, ensuring a seamless transition to cleaner energy sources without the need for installations or upfront costs. The company emphasizes community impact by partnering with local power generators whenever possible, thereby supporting local economies. Inspire has also launched initiatives like the Brighter World Project, which aims to provide clean energy solutions to communities disproportionately affected by climate change. In 2021, Inspire became a wholly-owned subsidiary of Shell Renewables and Energy Solutions, further solidifying its position in the renewable energy sector. Through its operations, Inspire has helped avoid over 8.1 billion pounds of carbon emissions, showcasing its commitment to environmental responsibility.

4. Terra-Gen, LLC

• Website: terra-gen.com
• Ownership type: Private Equity
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: March 2024
• Founded year: 2007
• Headcount: 201-500
• LinkedIn: terra-gen-operating-company-llc

Terra-Gen, LLC, based in San Diego, California, is a renewable energy company that specializes in wind, solar, and energy storage projects. Since its inception in 2007, Terra-Gen has developed over 5,000 megawatts of renewable energy capacity across the United States, primarily in California and Texas. The company operates a significant portfolio that includes 3.8 GW of wind, solar, and battery storage projects, which collectively power the equivalent of over one million homes. Terra-Gen serves a variety of clients, including utilities and municipalities, helping them transition to cleaner energy sources. The company is committed to sustainability and community development, actively engaging in initiatives that benefit local populations. Terra-Gen is owned by Abu Dhabi Future Energy Company PJSC – Masdar and Igneo Infrastructure Partners, which provides a strong financial foundation for its operations.

5. Iown

• Website: iownrenewable.com
• Ownership type: Private
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2014
• Headcount: 11-50
• LinkedIn: iown-renewable-energy-inc

IOWN Renewable Energy Inc. is a private company based in San Diego, California, with a focus on renewable energy solutions. Established in 2014, IOWN specializes in developing, financing, and managing projects in wind, solar, and energy storage. The company primarily serves industries in Sweden and Norway, aiming to support electrification and decarbonization efforts in these regions. Recently, IOWN entered a partnership with Hydro Rein, selling 80 percent of a portfolio of 25 wind power projects with a potential capacity of 2.4 GW. This collaboration underscores IOWN's commitment to sustainable energy development. The company has also been recognized for its innovative approach and growth, receiving accolades such as the SACC USA Business Award in 2023 and being named a Top 10 Energy Company to Watch. IOWN operates with a focus on sustainability, engaging with local communities and prioritizing minimal environmental impact in its projects.

6. Diamond Generating Corporation

• Website: dgc-us.com
• Ownership type: Corporate
• Headquarters: Los Angeles, California, United States (USA)
• Employee distribution: United States (USA) 80%, Mexico 20%
• Latest funding: February 2024
• Founded year: 1999
• Headcount: 51-200
• LinkedIn: dgc-us

Diamond Generating Corporation (DGC), founded in 1999 and based in Los Angeles, California, is a corporate entity specializing in safe and clean electricity generation. As a subsidiary of Mitsubishi Corporation, DGC leverages global expertise to navigate the complexities of the energy market. The company is involved in a variety of energy projects, including wind farms, utility-scale solar arrays, and battery energy storage facilities. DGC also engages in energy management services, providing tailored solutions to utilities and developers. Their commitment to sustainability is evident in their efforts to reduce carbon emissions and invest in renewable energy technologies. DGC's portfolio includes partnerships with companies like Nexamp, focusing on solar and storage assets, and Diamond Offshore Wind, which aims to develop offshore wind projects in the U.S. This multifaceted approach positions DGC as a notable entity in the renewable energy sector.

7. KinetEco Inc.

• Website: kinetecoinc.com
• Ownership type: Family Owned
• Headquarters: Los Angeles, California, United States (USA)
• Employee distribution: United States (USA) 68%, Brazil 32%
• Founded year: 1995
• Headcount: 51-200
• LinkedIn: kineteco

KinetEco Inc., based in Los Angeles, California, is a family-owned clean energy company that has been operational since 1995. The firm specializes in the development and manufacturing of solar and wind energy solutions, offering a range of products that include solar panels, batteries, and wind turbines. KinetEco serves both residential and commercial customers, aiming to help them reduce energy costs and minimize their environmental footprint. The company emphasizes innovation in renewable energy technologies, with a dedicated research and design team based in Barstow, California, focused on creating efficient and effective alternative energy systems. KinetEco also operates a manufacturing facility that aims to become a Zero Waste Facility, showcasing their commitment to sustainability. Their products are designed to be adaptable for various applications, making them a significant player in the renewable energy sector.

8. GreenTek, LLC

• Website: greentek.io
• Ownership type: Private
• Headquarters: Laguna Beach, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2018
• Headcount: 1-10
• LinkedIn: greentek-llc

GreenTek, LLC, based in Laguna Beach, California, is a renewable energy development company established in 2018. The firm is dedicated to deploying innovative green energy technologies aimed at addressing the growing demand for sustainable energy solutions. Their portfolio includes projects in solar energy, vertical axis wind turbine technology, thermal energy storage, and sustainable data centers. GreenTek also integrates blockchain technology into their operations, facilitating energy trading and investment opportunities. This approach not only enhances the efficiency of energy distribution but also aims to empower consumers by providing them with real-time data on energy usage. The company collaborates with scientists and capital partners to ensure that their projects are both economically viable and environmentally friendly. GreenTek's mission is to make sustainable energy solutions accessible to businesses and organizations worldwide, contributing to a greener future.

9. Generate

• Website: generatecapital.com
• Ownership type: Venture Capital
• Headquarters: San Francisco, California, United States (USA)
• Employee distribution: United States (USA) 92%, United Kingdom (UK) 7%
• Latest funding: Other (Debt), $1.2B, November 2024
• Founded year: 2014
• Headcount: 201-500
• LinkedIn: generatecapital

Generate Capital, founded in 2014 and based in San Francisco, is a sustainable infrastructure provider that focuses on delivering reliable and affordable resource solutions across multiple sectors, including energy, water, waste, and mobility. The company collaborates with technology firms and project developers to build, own, operate, and finance sustainable infrastructure. Their offerings include energy efficiency, battery storage, solar energy, electric vehicles, and waste management solutions. With over 2,000 operational assets and a growing portfolio, Generate Capital is committed to helping cities, campuses, and enterprises achieve their sustainability goals. Recently, they raised $1.2 billion in funding, further solidifying their position in the market and enabling them to expand their impact in the renewable energy sector.

10. 174 Power Global

• Website: 174powerglobal.com
• Ownership type: Private
• Headquarters: Irvine, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Other (Debt), $210.0M, September 2019
• Founded year: 2017
• Headcount: 201-500
• LinkedIn: 174-power-global-corporation

174 Power Global, based in Irvine, California, is a private renewable energy developer that specializes in solar power, energy storage, and green hydrogen solutions. Since its inception in 2017, the company has focused on creating sustainable energy projects across North America. With a workforce of approximately 152 employees, 174 Power Global has signed nearly 6.3 gigawatts of power purchase agreements and has more than 8 gigawatts of additional projects in the development pipeline. Their operational portfolio includes 0.8 gigawatts of projects currently in operation. The company collaborates closely with landowners, investors, and communities to ensure that their projects not only generate clean energy but also provide benefits to the local areas. Their innovative approach to energy storage and green hydrogen production positions them as a forward-thinking entity in the renewable energy sector. In 2019, they secured $210 million in funding, which underscores their growth potential and commitment to expanding their renewable energy initiatives.

11. Avantus

• Website: avantus.com
• Ownership type: Private Equity
• Headquarters: El Dorado Hills, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Other (Debt), $522.0M, July 2024
• Founded year: 2009
• Headcount: 51-200
• LinkedIn: 8minutenergy-renewables-llc

Avantus, based in El Dorado Hills, California, is a clean energy company that specializes in the development and management of renewable energy solutions, with a strong emphasis on solar power plants and energy storage systems. Founded in 2009, the company has evolved from its original identity as 8minute Solar Energy, reflecting its broader focus on clean energy technologies. Avantus provides a range of services, including innovative financing, project management, and asset management, aimed at facilitating the transition to sustainable energy for utilities and businesses. The company has recently attracted significant funding, amounting to $522 million, which underscores its potential for growth and its role in the renewable energy sector. Avantus is committed to creating energy solutions that are clean, reliable, and affordable, positioning itself as a key player in the ongoing shift towards renewable energy.

12. SB Energy

• Website: sbenergy.com
• Ownership type: Private Equity
• Headquarters: San Francisco, California, United States (USA)
• Employee distribution: United States (USA) 70%, India 25%, Japan 4%, Other 1%
• Latest funding: Other (Debt), $2.4B, November 2023
• Founded year: 2015
• Headcount: 51-200
• LinkedIn: sb-energy-softbank-group-

SB Energy, based in San Francisco, California, is a private equity-backed renewable energy company that specializes in utility-scale solar energy and energy storage solutions. Founded in 2015, the company has developed a robust portfolio, including 2 GW of operating projects and an impressive pipeline of over 15 GW of solar projects and 12 GWh of storage projects. SB Energy is dedicated to helping utility providers and large corporations transition to sustainable energy through innovative project development and long-term energy management. The company has received significant backing from SoftBank Group and Ares Climate Infrastructure, raising $8 billion in project capital to support its initiatives. With a focus on operational excellence and strategic partnerships, SB Energy is committed to delivering reliable renewable energy solutions that benefit communities and the environment.

13. Inspire

• Website: helloinspire.com
• Ownership type: Private
• Headquarters: Santa Monica, California, United States (USA)
• Founded year: 2013
• Headcount: 51-200
• LinkedIn: helloinspire

Inspire Clean Energy, founded in 2013 and based in Santa Monica, California, is a private company dedicated to providing 100% renewable energy solutions to residential consumers. The company aims to facilitate a transition to a net-zero carbon future by offering clean energy plans sourced from wind, solar, and hydropower. Inspire empowers its customers to take climate action and reduce their carbon footprint without the need for solar panel installations. They partner with local power generators to source clean energy, ensuring a direct impact on local communities. Inspire has also been recognized for its commitment to sustainability and social impact, including initiatives like the Brighter World Project, which provides clean energy solutions to those in critical need. As a wholly-owned subsidiary of Shell Renewables and Energy Solutions, Inspire is positioned to further its mission of transforming the energy landscape and making clean energy accessible to all.

14. Sunflow Energy

• Website: sunflow.io
• Ownership type: Private
• Headquarters: Truckee, California, United States (USA)
• Employee distribution: United States (USA) 65%, Zimbabwe 18%, Slovakia 18%
• Founded year: 2017
• Headcount: 1-10
• LinkedIn: sunflow-holdings-llc

Sunflow Energy, based in Truckee, California, is a private company founded in 2017 that specializes in renewable energy solutions. The firm focuses on developing, designing, and constructing sustainable energy projects, including microgrids, wind, and solar initiatives. With a team of experienced engineers and builders, Sunflow Energy has successfully implemented projects in various locations, including U.S. embassies and military installations around the world. Their consulting services cater to both government and private sector clients, helping them transition to renewable energy. The company operates independently and is self-funded, which allows for flexibility and innovation in their project execution. Sunflow Energy's commitment to addressing energy needs in remote areas and their involvement in international projects highlight their role in the global shift towards sustainable energy.

15. SunPower Corporation

• Website: us.sunpower.com
• Ownership type: Private Equity
• Headquarters: Richmond, California, United States (USA)
• Employee distribution: United States (USA) 55%, Philippines 35%, Mexico 4%, Other 7%
• Latest funding: Other (Debt), $300.0M, February 2024
• Founded year: 1985
• Headcount: 1001-5000
• LinkedIn: sunpower-corporation

SunPower Corporation, based in Richmond, California, is a prominent solar energy provider that specializes in residential solar solutions. Established in 1985, the company has nearly four decades of experience in the solar industry. SunPower offers a range of products, including high-efficiency solar panels, battery storage systems, and electric vehicle (EV) charging solutions, all designed to help homeowners lower their energy costs and minimize their environmental footprint. The company operates through a network of certified dealers, ensuring personalized service and support for customers. Recently, SunPower secured $300 million in funding, which reflects its ongoing commitment to innovation and growth in the renewable energy sector. Their focus on quality and customer satisfaction is evident in their industry-leading 25-year warranty on solar panels, underscoring their dedication to providing reliable and efficient solar solutions.

16. Site Constructors Inc

• Website: siteconstructors.net
• Ownership type: Private
• Headquarters: Chico, California, United States (USA)
• Employee distribution: United States (USA) 84%, United Kingdom (UK) 16%
• Founded year: 1985
• Headcount: 11-50
• LinkedIn: site-constructors-inc

Site Constructors Inc, based in Chico, California, has been operational since 1985, focusing on construction services tailored to renewable energy solutions. The company specializes in various energy generation methods, including wind, solar, hydroelectric, and biomass. With a core team of approximately 20 professionals, Site Constructors Inc has built a reputation for quality workmanship and multi-service capabilities. Their experience spans mini, small, and large-scale projects, catering to major manufacturers and engineering firms. They have successfully completed numerous projects across the United States and Canada, providing engineering, procurement, construction, and maintenance services. Their client portfolio includes notable entities such as Pacific Gas & Electric and the U.S. Bureau of Reclamation, showcasing their credibility in the renewable energy sector. Currently, they are involved in significant projects, including the construction of a 30MW solar photovoltaic and 120 MWh battery energy storage system in Hawaii, further solidifying their role in advancing renewable energy infrastructure.

17. Eurus Energy America Corporation

• Website: eurusenergy.com
• Ownership type: Private
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 95%, Mexico 5%
• Founded year: 1987
• Headcount: 11-50
• LinkedIn: eurus-energy-america-corporation

Eurus Energy America Corporation, based in San Diego, California, is a private company specializing in the development of renewable energy projects, particularly in wind and solar energy. Established in 1987, Eurus Energy America has been at the forefront of wind energy development in the United States, contributing to the transition towards cleaner energy solutions. The company operates several wind farms, including notable projects like the Bull Creek and Spearville wind farms, and is expanding its portfolio to include solar energy projects, such as the Avenal solar facility. With a commitment to providing reliable and sustainable energy, Eurus Energy America focuses on addressing the increasing demand for renewable resources. Their innovative approach has led to significant achievements in the industry, including the introduction of advanced wind turbine technology and successful solar project financing.

18. Orion Renewable Energy Group LLC

• Website: orionrenewables.com
• Ownership type: Private
• Headquarters: Oakland, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1998
• Headcount: 11-50
• LinkedIn: orion-energy-group-llc

Orion Renewable Energy Group LLC, based in Oakland, California, is a private company specializing in the development of renewable energy projects, particularly in solar and wind energy. Since its inception in 1998, Orion has successfully transitioned numerous projects from concept to completion, demonstrating a strong commitment to delivering clean energy solutions. The company collaborates closely with landowners, public officials, and local communities to ensure that their projects align with the needs and values of those they impact. With a management team boasting over 160 years of combined experience in the renewable sector, Orion has developed a robust portfolio that includes significant projects like the Dunns Bridge Solar and Clearwater Wind. Their operational capacity exceeds 8,000 MW, enough to power approximately 2.5 million homes. Orion's focus on creating stable income sources for landowners and generating local tax revenues underscores their dedication to community engagement and economic development. They have not reported any recent funding, indicating a self-sustaining operational model.

19. PowerWorks LLC

• Website: powerworks.com
• Ownership type: Private
• Headquarters: Tracy, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1998
• Headcount: 11-50
• LinkedIn: powerworks-llc

PowerWorks LLC, based in Tracy, California, is a private company that specializes in the development, ownership, and operation of renewable energy projects, particularly wind and solar farms. Founded in 1998, PowerWorks has over 25 years of experience in the renewable energy sector. The company has successfully owned and operated multiple wind farms in California, totaling over 900 wind turbines, and currently manages the 22 MW Sawtooth wind farm in Idaho. PowerWorks is actively developing new utility-scale wind and solar projects across the United States, aiming to enhance local economies and create jobs through clean energy solutions. Their services extend to utility companies and local governments, showcasing their commitment to sustainable energy practices. The company employs a skilled team of professionals in engineering, finance, and operations, ensuring effective project management and maintenance of their renewable energy assets.

20. eIQ Mobility, a NextEra Energy Company

• Website: eiqmobility.com
• Ownership type: Corporate
• Headquarters: San Francisco, California, United States (USA)
• Latest funding: Seed, February 2019
• Founded year: 2018
• Headcount: 11-50
• LinkedIn: eiqmobility

eIQ Mobility, a NextEra Energy Company, is a clean energy firm based in San Francisco, California. Founded in 2018, the company specializes in providing electric vehicle (EV) charging solutions and energy management services. As part of NextEra Energy, which is recognized for its significant investments in renewable energy generation, eIQ Mobility plays a crucial role in promoting the adoption of electric vehicles. Their services are designed to help businesses and communities transition to cleaner energy sources, thereby supporting sustainability goals. eIQ Mobility's focus on innovative energy solutions is vital in the context of the growing demand for EV infrastructure, which is essential for reducing reliance on fossil fuels and achieving emissions reduction targets.

Renewable Energy Insights: Key Companies in California

Company	Headquarter	Size	Founded	Ownership
Pattern Energy	San Francisco, California, United States (USA)	501-1000	2012	Corporate
8minute Solar Energy	Los Angeles, California, United States (USA)	51-200	2009	Private
Inspire	Santa Monica, California, United States (USA)	51-200	2014	Corporate
Terra-Gen, LLC	San Diego, California, United States (USA)	201-500	2007	Private Equity
Iown	San Diego, California, United States (USA)	11-50	2014	Private
Diamond Generating Corporation	Los Angeles, California, United States (USA)	51-200	1999	Corporate
KinetEco Inc.	Los Angeles, California, United States (USA)	51-200	1995	Family Owned
GreenTek, LLC	Laguna Beach, California, United States (USA)	1-10	2018	Private
Generate	San Francisco, California, United States (USA)	201-500	2014	Venture Capital
174 Power Global	Irvine, California, United States (USA)	201-500	2017	Private
Avantus	El Dorado Hills, California, United States (USA)	51-200	2009	Private Equity
SB Energy	San Francisco, California, United States (USA)	51-200	2015	Private Equity
Inspire	Santa Monica, California, United States (USA)	51-200	2013	Private
Sunflow Energy	Truckee, California, United States (USA)	1-10	2017	Private
SunPower Corporation	Richmond, California, United States (USA)	1001-5000	1985	Private Equity
Site Constructors Inc	Chico, California, United States (USA)	11-50	1985	Private
Eurus Energy America Corporation	San Diego, California, United States (USA)	11-50	1987	Private
Orion Renewable Energy Group LLC	Oakland, California, United States (USA)	11-50	1998	Private
PowerWorks LLC	Tracy, California, United States (USA)	11-50	1998	Private
eIQ Mobility, a NextEra Energy Company	San Francisco, California, United States (USA)	11-50	2018	Corporate

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