California's solar power industry is at the forefront of renewable energy innovation, driven by a push for sustainability and energy independence. Companies range from giants like SunPower, known for their high-efficiency solar panels, to smaller firms focused on niche solutions like energy storage or solar roofing. The sector is witnessing rapid growth, fueled by advancements in solar technology and favorable government policies. Increasing adoption among homeowners and businesses reflects a shift towards green energy, aiming to reduce carbon footprints while saving on energy costs. Inevitably, as electric vehicle growth continues, solar power will play a vital role in charging infrastructure.

This list highlights 20 solar power companies across California, featuring firms of varying sizes from emerging startups to established enterprises. With headquarters ranging from the Bay Area to Southern California, these companies have been founded between 1985 and 2019. They specialize in a range of solar solutions, such as panel installations, energy storage, and integrated roofing technology. By focusing on residential and commercial sectors, they offer a mix of quality products and customer service, showcasing the innovative spirit driving the state’s solar energy market.

Read on to discover the top solar power companies in California.

Top 20 Solar Power Companies in California

1. 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 has been operational since 1985. The company specializes in residential solar solutions, offering a range of products including high-quality solar panels, battery storage systems, and electric vehicle (EV) charging solutions. SunPower aims to help homeowners reduce their energy costs and environmental impact through its innovative technologies. The company operates through a network of certified dealers, ensuring personalized service and support for its customers. Recently, SunPower secured $300 million in funding in February 2024, which underscores its financial stability and growth potential in the solar industry. With a workforce of approximately 3,572 employees, SunPower continues to play a significant role in advancing solar energy adoption in the United States and beyond.

2. Renogy

• Website: renogy.com
• Ownership type: Venture Capital
• Headquarters: Ontario, California, United States (USA)
• Employee distribution: United States (USA) 48%, China 48%, Czech Republic 2%, Other 2%
• Latest funding: Series E-K, June 2022
• Founded year: 2010
• Headcount: 501-1000
• LinkedIn: renogy

Renogy, based in Ontario, California, is a solar energy provider that specializes in renewable energy solutions. Since its inception in 2010, the company has focused on offering a wide array of products, including solar panels, batteries, and inverters. These products are designed to help both consumers and businesses achieve energy independence and cost savings through solar power. Renogy operates primarily through an online platform, which allows customers to easily access and purchase solar energy systems. The company has a significant presence in the market, with a workforce distributed across the United States and China, and it has been involved in various funding rounds to support its growth. Renogy's mission is to accelerate the adoption of clean energy solutions globally, making it a relevant player in the solar power industry.

3. Semper Solaris

• Website: sempersolaris.com
• Ownership type: Private
• Headquarters: El Cajon, California, United States (USA)
• Employee distribution: United States (USA) 99%
• Founded year: 2012
• Headcount: 501-1000
• LinkedIn: semper-solaris

Semper Solaris, based in El Cajon, California, is a private solar energy provider and roofing contractor that specializes in solar power solutions, roofing services, battery storage, and HVAC systems. Founded in 2012, the company primarily serves homeowners looking to improve energy efficiency and lower utility costs. Semper Solaris has built a reputation for quality service and customer satisfaction, which is reflected in their numerous awards, including recognition as a top residential solar installer. They offer a range of services that integrate solar energy systems with roofing and energy efficiency solutions, making them a comprehensive provider in the residential market. The company operates across various locations in the United States, including major markets in California, Texas, Florida, and Arizona, showcasing their operational reach and commitment to expanding their footprint in the solar industry.

4. d.light

• Website: dlight.com
• Ownership type: Venture Capital
• Headquarters: San Francisco, California, United States (USA)
• Employee distribution: Kenya 48%, Tanzania 13%, India 13%, Other 25%
• Latest funding: Other (Debt), $176.0M, July 2024
• Founded year: 2007
• Headcount: 501-1000
• LinkedIn: d-light-design

d.light is a solar energy company based in San Francisco, California, founded in 2007. The company specializes in providing innovative solar solutions aimed at improving energy access for underserved communities. Their product offerings include solar home systems, inverters, and appliances, all designed to enhance the quality of life for consumers. d.light operates on a Pay-As-You-Go model, which allows customers to access solar energy without the burden of upfront costs. This model has proven effective in reaching low-income households, particularly in regions with limited access to traditional electricity sources. With a workforce of nearly 1,000 employees, d.light has a significant presence in countries such as Kenya, Tanzania, India, Nigeria, and Uganda. The company has successfully transformed the lives of over 180 million people and has offset 40 million tons of CO2 through its clean energy products and carbon projects. Recently, d.light secured $176 million in funding, underscoring its growth trajectory and the confidence investors have in its mission to provide sustainable energy solutions.

5. Freedom Forever

• Website: freedomforever.com
• Ownership type: Private
• Headquarters: Temecula, California, United States (USA)
• Employee distribution: United States (USA) 99%, Other 1%
• Founded year: 2011
• Headcount: 1001-5000
• LinkedIn: freedom-forever

Freedom Forever, based in Temecula, California, is a private solar energy provider specializing in residential solar panel installation and energy storage solutions. Founded in 2011, the company aims to help homeowners reduce energy costs and achieve greater energy independence through renewable energy. Freedom Forever offers tailored solar systems and flexible financing options, ensuring a smooth transition to solar power for its customers. The company has built a reputation for its commitment to customer service, exemplified by its unique 25-year production guarantee on energy output. With a workforce of approximately 1,800 employees, Freedom Forever actively operates in multiple states across the U.S., making significant strides in the solar industry. Their innovative tools, such as the Volt mobile app for sales management, further enhance their operational efficiency and customer engagement.

6. Greentech Renewables

• Website: greentechrenewables.com
• Ownership type: Private
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1957
• Headcount: 1001-5000
• LinkedIn: cedgreentech

Greentech Renewables, established in 1957 and headquartered in San Diego, California, specializes in renewable energy solutions with a strong emphasis on solar technology. The company provides a wide array of products, including solar panels, inverters, energy storage systems, and solar racking. They also offer design services and financing solutions tailored for residential, commercial, and organizational clients. Greentech Renewables aims to support customers in implementing solar technology efficiently and cost-effectively. Their operations extend beyond mere product supply; they engage in project design and provide logistical support, showcasing their commitment to enhancing the solar installation process. With a workforce of over 600 employees, the company is well-positioned to meet the growing demand for solar energy solutions across the United States.

7. Green Solar Technologies

• Website: greensolartechnologies.com
• Ownership type: Corporate
• Headquarters: Los Angeles, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: February 2024
• Founded year: 2010
• Headcount: 201-500
• LinkedIn: green-solar-technologies

Green Solar Technologies, based in Los Angeles, California, is a solar energy provider that specializes in affordable solar solutions for residential and commercial clients. Established in 2010, the company has built a reputation for delivering high-quality, American-made solar products. They offer a comprehensive suite of services, including solar panel installation, energy storage systems, and financing options designed to help customers reduce their energy costs and carbon footprint. With a focus on customer satisfaction, Green Solar Technologies aims to make solar energy accessible to a broad audience. Their commitment to quality and service is evident in their partnerships with reputable manufacturers like LG and REC, ensuring that clients receive reliable and efficient solar technology. The company operates nationwide, providing solar solutions across various states, which further solidifies its position in the industry.

8. GAF Energy

• Website: gaf.energy
• Ownership type: Private
• Headquarters: San Jose, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Other (Grant), $1.6M, May 2024
• Founded year: 2019
• Headcount: 201-500
• LinkedIn: gaf-energy

GAF Energy, founded in 2019 and based in San Jose, California, is a private company specializing in solar roofing solutions. The company focuses on integrating solar technology into traditional roofing materials, offering products like Timberline Solar™, which not only protects homes but also generates clean electricity. GAF Energy aims to provide homeowners with energy-efficient roofs that can pay for themselves over time, appealing to those seeking sustainable energy options. Their products are designed for easy installation by roofing contractors, leveraging existing skills and tools. With a workforce of approximately 383 employees, GAF Energy is committed to creating American jobs, as their products are designed and assembled in the USA. The company has received funding, including a $1.6 million grant in May 2024, which supports their growth and innovation in the solar market.

9. Alta Devices

• Website: altadevices.com
• Ownership type: Corporate
• Headquarters: Sunnyvale, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: December 2013
• Founded year: 2008
• Headcount: 201-500
• LinkedIn: alta-devices

Alta Devices, founded in 2008 and based in Sunnyvale, California, is a company dedicated to advancing solar energy solutions. They specialize in the development of high-efficiency solar cells, particularly using Gallium Arsenide technology, which has allowed them to achieve notable efficiency records in solar energy conversion. The company provides a range of products, including solar panels, batteries, and inverters, while also serving as an educational resource for homeowners and businesses interested in solar energy. Their target market includes both residential and commercial sectors, aiming to help customers reduce energy costs and promote sustainability. Alta Devices has been involved in various collaborations, including partnerships with automotive companies to integrate solar technology into vehicles, showcasing their commitment to innovation in the solar industry.

10. Renova Energy

• Website: renovaenergy.com
• Ownership type: Private
• Headquarters: Palm Desert, California, United States (USA)
• Latest funding: September 2022
• Founded year: 2006
• Headcount: 201-500
• LinkedIn: renova-solar

Renova Energy, based in Palm Desert, California, is a private solar energy provider that specializes in the installation, maintenance, and cleaning of solar panels. Since its inception in 2006, the company has focused on serving both residential and commercial clients in California and Arizona, facilitating their transition to renewable energy solutions. Renova Energy prides itself on its customer service, with over 1,000 five-star reviews and a significant portion of new customers coming through referrals. The company has also been recognized for its excellence in the industry, receiving multiple awards from SunPower, including National Customer Excellence and National Dealer of the Year. Additionally, Renova Energy operates an in-house service department, which allows them to provide comprehensive maintenance and repair services for solar systems, further solidifying their position in the market.

11. 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, founded in 2012 and based in San Francisco, California, is a corporate entity focused on renewable energy solutions. The company develops, constructs, owns, and operates utility-scale wind and solar power facilities across North America. With a global development portfolio of approximately 29 gigawatts and around 6 gigawatts of installed capacity, Pattern Energy is committed to providing sustainable energy solutions to utility companies and businesses. They have completed over 750 commercial solar projects through their affiliate, Solect Energy, showcasing their active role in the solar industry. The company emphasizes community engagement and environmental stewardship, aiming to build trust and transparency with the communities they serve. Their operational footprint includes significant investments in both solar and wind energy, reflecting a balanced approach to renewable energy development.

12. Infinity Solar

• Website: infinitysolar.net
• Ownership type: Private
• Headquarters: Orange, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1999
• Headcount: 11-50
• LinkedIn: infinity-solar-orange-ca

Infinity Solar, based in Orange, California, is a private solar energy provider that has been operational since 1999. The company specializes in custom-designed solar panel and home battery systems, catering to both residential and commercial customers. Infinity Solar focuses on reducing electricity costs while promoting sustainable energy solutions. They offer a range of products, including the Tesla Powerwall and Panasonic solar panels, and emphasize high-quality installation services. The company operates primarily in Southern California and aims to facilitate the transition to renewable energy through various financing options. Infinity Solar's commitment to customer satisfaction and its partnerships with well-known brands position it as a relevant player in the solar industry.

13. Baker Home Energy

• Website: bakerhomeenergy.com
• Ownership type: Family Owned
• Headquarters: Escondido, California, United States (USA)
• Employee distribution: United States (USA) 96%, Mexico 4%
• Founded year: 2007
• Headcount: 201-500
• LinkedIn: bakerhomeenergy

Baker Home Energy, based in Escondido, California, is a family-owned company founded in 2007. The firm specializes in providing comprehensive home energy solutions, with a strong focus on renewable energy. Their primary offerings include solar energy systems, home battery installations, and HVAC services, alongside roofing solutions. Baker Home Energy aims to assist homeowners in Southern California in reducing their energy costs and enhancing home comfort through efficient energy management. The company prides itself on its extensive experience, having been in the home energy sector for over 86 years, which contributes to its credibility and expertise in the field. They are also a certified installer of Tesla Powerwall, indicating their commitment to integrating advanced technology into their solar solutions. Baker Home Energy actively engages with customers to provide tailored energy solutions, ensuring that their services meet the specific needs of each homeowner.

14. 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, with a particular emphasis on solar power and energy storage. The company has developed a significant portfolio of projects, aiming to deliver reliable and affordable clean energy to utilities and organizations. Avantus is recognized for its innovative approach, integrating advanced technology into its smart power plants, which are designed to meet the evolving energy needs of its customers. The company has successfully executed numerous power purchase agreements across the Western United States, contributing to its reputation in the industry. With a workforce of approximately 177 employees, Avantus is actively engaged in the clean energy transition, focusing on large-scale solar and energy storage projects that aim to serve millions of people. Their commitment to sustainability and technological advancement positions them as a relevant player in the solar power sector.

15. Xero Solar

• Website: xerosolar.com
• Ownership type: Private
• Headquarters: El Segundo, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2010
• Headcount: 51-200
• LinkedIn: xerosolar

Xero Solar is a California-based solar energy company established in 2010. Located in El Segundo, the firm specializes in designing, installing, and managing solar energy systems tailored for both residential and commercial customers. They also provide energy storage solutions, which help clients optimize energy usage and reduce costs. Xero Solar prides itself on a consultative approach, ensuring that each project aligns with the unique needs of its clients. The company emphasizes quality and customer satisfaction, employing experienced in-house staff to oversee projects from design to installation. Their commitment to sustainability and community education further solidifies their role in promoting renewable energy in Southern California.

16. REC Solar

• Website: recsolar.com
• Ownership type: Private Equity
• Headquarters: San Luis Obispo, California, United States (USA)
• Employee distribution: United States (USA) 53%, Singapore 35%, Norway 9%, Other 3%
• Latest funding: October 2023
• Founded year: 1997
• Headcount: 11-50
• LinkedIn: rec-solar

REC Solar, founded in 1997 and based in San Luis Obispo, California, is a commercial solar energy provider that specializes in onsite solar, energy storage, and community solar solutions. The company serves a variety of clients, including businesses, municipalities, and educational institutions, helping them reduce energy costs and meet sustainability goals through renewable energy projects. With a workforce of approximately 436 employees, REC Solar has completed over 700 projects nationwide, totaling 675 MW of solar and storage capacity. Their services include expert design, seamless financing options, and long-term support, ensuring that clients can effectively manage their energy needs. REC Solar's commitment to integrity and high-quality standards is evident in their project execution and customer relationships, making them a trusted partner in the commercial solar sector.

17. Stellar Solar

• Website: stellarsolar.net
• Ownership type: Private
• Headquarters: Oceanside, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1998
• Headcount: 51-200
• LinkedIn: stellar-solar-inc-

Stellar Solar, based in Oceanside, California, is a private solar energy company that has been operational since 1998. With a workforce of approximately 82 employees, the company specializes in solar panel installations, battery storage solutions, and electric vehicle (EV) charging systems for both residential and commercial clients. Over the years, Stellar Solar has completed more than 15,000 installations, showcasing their extensive experience in the field. The company has garnered a strong reputation in Southern California, consistently being recognized as one of the best solar companies in the region. Their commitment to helping customers reduce energy costs and achieve energy independence is evident in their service offerings, which include innovative solutions like the Tesla Powerwall. Stellar Solar also emphasizes customer satisfaction, as reflected in their numerous positive reviews and referrals, which constitute a significant portion of their new business. The company operates primarily in Southern California and has expanded its services to Michigan, further solidifying its presence in the solar market.

18. Green Home Systems

• Website: greenhomesystems.com
• Ownership type: Private
• Headquarters: Los Angeles, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2010
• Headcount: 51-200
• LinkedIn: greenhomesystemsus

Green Home Systems, based in Los Angeles, California, is a private solar energy provider that has been operational since 2010. The company focuses on solar panel installations and energy solutions tailored for residential customers. They offer a range of products, including solar panels from well-known manufacturers like Panasonic and Qcells, as well as inverters and battery storage options. Green Home Systems prides itself on its customer service, managing the entire process from installation to ensuring energy efficiency. With a presence in 21 states and a network of over 1,000 installers, they have successfully served more than 11,000 customers. Their mission emphasizes providing affordable and efficient clean energy solutions, which aligns with the growing demand for sustainable energy alternatives.

19. SunWize Technologies, Inc.

• Website: sunwize.com
• Ownership type: Private
• Headquarters: San Jose, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Other (Grant), $13,000, February 2007
• Founded year: 1992
• Headcount: 51-200
• LinkedIn: sunwize-technologies-inc

SunWize Technologies, Inc., based in San Jose, California, specializes in renewable energy solutions, particularly in the design and manufacturing of remote power systems. Founded in 1992, the company has built a reputation for providing reliable off-grid solar power, battery backup, and hybrid systems tailored to meet specific operational needs. Their clientele includes government entities and large corporations, showcasing their ability to deliver complex energy solutions. SunWize has deployed over 15,000 custom-designed systems across all seven continents, emphasizing their global reach and expertise. The company operates manufacturing and distribution hubs on both the West and East Coasts of the United States, ensuring efficient service and support for their customers. Their product offerings include a range of solar modules, enclosures, and custom power systems, all rigorously tested to meet high standards before delivery.

20. Sustainable Energy Group - SEG

• Website: sustainableenergygroup.com
• Ownership type: Private
• Headquarters: Grass Valley, California, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2004
• Headcount: 11-50
• LinkedIn: segenergy

Sustainable Energy Group - SEG, based in Grass Valley, California, is a solar energy company that has been operational since 2004. The firm specializes in the installation of solar energy systems and backup power solutions, catering to residential, commercial, and non-profit clients. SEG is dedicated to helping its customers achieve energy independence while reducing their energy costs through renewable energy solutions. The company prides itself on its local expertise, having served various communities in Northern California, including Grass Valley, Nevada City, and surrounding areas. SEG is a licensed contractor in multiple fields, including general, electrical, solar, and plumbing, which allows them to offer comprehensive services. Their commitment to quality is reflected in their 25-year parts and labor warranty, and they emphasize clear communication and customer satisfaction throughout the installation process.

Solar Power Insights: Key Companies in California

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