The solar energy industry in Illinois is rapidly evolving, characterized by a growing adoption of renewable technologies. Companies in this sector focus on solar panel production, installations, energy consulting, and electrification programs. They also explore innovative financing and community-oriented solutions to expand access to clean energy. With an increasing shift toward sustainability, solar energy firms are anticipating further regulatory support and financial incentives, aiming to reduce costs for consumers while enhancing energy independence. This environment creates opportunities for new entrants and encourages established players to innovate, ensuring a brighter future for renewable energy in the state.

Illinois hosts a mix of solar companies, ranging from innovative startups to established firms, each specializing in different aspects of solar technology. Headquartered in key cities like Chicago and Oak Brook, these companies came into existence between 2006 and 2022, often employing between 11 to several thousand people. They focus on offering products such as solar installations, storage solutions, and energy management services. With an increasing emphasis on sustainability, many of these firms not only contribute to energy efficiency but also seek enhancements in customer education and local job growth.

Continue reading to discover more about the top solar energy companies in Illinois.

Top 21 Solar Energy Companies in Illinois

1. Greenlight Planet

• Website: greenlightplanet.com
• Ownership type: Private Equity
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: Kenya 35%, Nigeria 29%, India 16%, Other 20%
• Latest funding: $10.0M, February 2015
• Founded year: 2009
• Headcount: 1001-5000
• LinkedIn: greenlightplanet

Greenlight Planet, now operating under the brand name Sun King, was founded in 2009 and is headquartered in Chicago, Illinois. The company specializes in solar energy solutions aimed at off-grid households and businesses, primarily in Africa and Asia. Their product offerings include solar lanterns, home solar systems, and solar inverters, designed to provide reliable energy access to those without traditional grid connections. With a workforce of approximately 1,792 employees, Greenlight Planet has established a significant market presence, selling over 25 million solar products and powering nearly 22 million homes. The company has also extended nearly $1 billion in solar loans to households, showcasing its commitment to making solar energy accessible through innovative financing options. Greenlight Planet's operations span multiple countries, including Kenya, Nigeria, India, and Uganda, reflecting its focus on regions where energy access is a pressing need.

2. Hecate Energy LLC

• Website: hecateenergy.com
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Other (Debt), $550.0M, January 2023
• Founded year: 2012
• Headcount: 11-50
• LinkedIn: hecate-energy-llc

Hecate Energy LLC, based in Chicago, Illinois, is a renewable energy developer that specializes in solar and wind energy projects, along with energy storage solutions. Founded in 2012, the company has built a reputation for its innovative project development and strong community partnerships. Hecate Energy collaborates with municipal utilities, investor-owned utilities, and educational institutions to deliver customized energy solutions that enhance reliability and sustainability. With a project pipeline of around 35 GW, Hecate Energy is actively involved in the development of significant renewable energy projects across the United States. Their recent funding of $550 million in January 2023 supports their ambitious plans to monetize approximately 5 GW of renewable energy annually. Hecate Energy's commitment to environmental quality and local economic sustainability is evident in their projects, which aim to provide clean energy while preserving community values.

3. Verde Solutions

• Website: verdesolutions.com
• Ownership type: Corporate
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: January 2022
• Founded year: 2012
• Headcount: 11-50
• LinkedIn: verde-solutions-llc

Verde Solutions, founded in 2012 and based in Chicago, Illinois, is an energy consulting firm that specializes in sustainable energy solutions. The company focuses on solar energy installation, electric vehicle (EV) charging infrastructure, commercial energy storage, and HVAC systems. Verde Solutions provides a comprehensive suite of services that includes consulting, engineering, and project management, ensuring that their clients receive tailored solutions to meet their specific energy needs. With a team of experienced professionals, Verde Solutions has successfully completed numerous projects across various sectors, helping businesses and organizations reduce energy costs and enhance sustainability. Their commitment to utilizing advanced technologies and innovative practices positions them as a relevant player in the solar energy industry.

4. Certasun

• Website: certasun.com
• Ownership type: Private
• Headquarters: Buffalo Grove, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2018
• Headcount: 11-50
• LinkedIn: certasun

Certasun, based in Buffalo Grove, Illinois, is a private solar energy company founded in 2018. With a team of 31 employees, Certasun specializes in residential solar installations, EV charger installations, and home battery systems. The company primarily serves homeowners in the Chicago and Milwaukee areas, aiming to reduce energy costs and promote sustainability. Certasun prides itself on delivering a high-quality customer experience through in-house consultations and services, ensuring that all aspects of the installation process are handled directly by their team. They have completed over 2,000 solar projects and maintain a strong reputation, as evidenced by their high ratings on platforms like Google and SolarReviews. Certasun also offers additional services such as SunPower repair and heat pump water heater installations, further solidifying their role in the clean energy sector.

5. Carbon Solutions Group

• Website: carbonsolutionsgroup.com
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2006
• Headcount: 11-50
• LinkedIn: carbon-solutions-group

Carbon Solutions Group, founded in 2006 and based in Chicago, Illinois, is a private renewable energy company that specializes in solar energy solutions, electric vehicle charging infrastructure, and environmental consulting services. The company serves a wide range of clients, including homeowners, businesses, and municipalities, assisting them in achieving their sustainability goals. Carbon Solutions Group has become a significant player in the solar market, having partnered with over 250 solar installers and managing more than 20,000 solar aggregation projects across 20 states. Their operations include SREC aggregation, which allows clients to monetize the renewable energy produced by their solar systems. In addition to solar, the company is also involved in developing electric vehicle charging infrastructure and providing ESG advisory services, contributing to a cleaner energy future.

6. Tron Solar

• Website: tron.solar
• Ownership type: Private
• Headquarters: Vernon Hills, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2018
• Headcount: 51-200
• LinkedIn: tron-solar

Tron Solar, based in Vernon Hills, Illinois, is a private company that specializes in renewable energy solutions, particularly solar energy systems tailored for homes and businesses. Founded in 2018, Tron Solar has quickly made a name for itself by offering a range of products including solar panels, battery storage systems, and electric vehicle chargers. The company focuses on helping customers reduce energy costs and achieve greater energy independence. Their services extend to both residential and commercial sectors, with a strong emphasis on installation and maintenance of solar energy systems. Tron Solar prides itself on its customer service, claiming to provide a '5-star white glove service' and has garnered positive reviews from clients. They also engage in solar education, helping potential customers understand the benefits and workings of solar energy. With a workforce of 51-200 employees, Tron Solar is positioned to make a significant impact in the renewable energy sector, particularly in the Midwest.

7. LG Solar USA

• Website: lgsolarusa.com
• Ownership type: Private
• Headquarters: Lincolnshire, Illinois, United States (USA)
• Employee distribution: United States (USA) 54%, India 18%, South Korea 9%, Other 19%
• Founded year: 1958
• Headcount: 10001+
• LinkedIn: lg-solar-usa

LG Solar USA, based in Lincolnshire, Illinois, is a private company that specializes in solar energy solutions. Founded in 1958, the company has established itself as a provider of solar panels, inverters, and various applications related to solar energy. LG Solar USA serves a wide range of clients, including residential homeowners, commercial businesses, and industrial clients, helping them transition to renewable energy sources. Their products are designed to harness sunlight efficiently, thereby reducing energy costs and minimizing environmental impact. The company is part of a global effort to promote sustainable energy practices and has a workforce that spans multiple countries, including significant operations in the United States, India, and South Korea. LG Solar USA's focus on innovation and efficiency in solar technology underscores its relevance in the solar energy market.

8. Day & Night Solar

• Website: dayandnightsolar.com
• Ownership type: Private
• Headquarters: Collinsville, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2009
• Headcount: 11-50
• LinkedIn: day-night-solar

Day & Night Solar, based in Collinsville, Illinois, is a private solar energy provider that specializes in turn-key solar solutions for businesses and organizations. Since its inception in 2009, the company has expanded its operations across the United States, offering a full suite of services that includes the design, installation, financing, and maintenance of solar energy systems. Day & Night Solar aims to help clients reduce energy costs while facilitating a smooth transition to renewable energy sources. They work closely with local contractors to ensure high-quality installations and support. The company is also committed to educating its clients about available incentives and financing options, making solar energy more accessible. Their focus on integrity and customer satisfaction is central to their business model, which has allowed them to build a solid reputation in the industry.

9. 93Energy

• Website: 93energy.com
• Ownership type: Private
• Headquarters: Skokie, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2018
• Headcount: 11-50
• LinkedIn: 93energy

93Energy, based in Skokie, Illinois, is a solar energy provider that specializes in solar panel installation, energy storage solutions, and electric vehicle (EV) charger installations. Founded in December 2018, the company serves both residential and commercial customers, helping them reduce energy costs and promote sustainability through renewable energy solutions. With a team of 19 employees, 93Energy focuses on customer satisfaction, offering tailored solutions that meet the unique energy needs of their clients. They provide financing options and guidance on available incentives, making solar energy more accessible. Their services extend across the Northern Midwest, and they have built a reputation for quality installations and customer service. 93Energy is committed to contributing to a greener future by empowering businesses and homeowners to harness solar energy effectively.

10. Ailey Solar Electric, Inc.

• Website: aileysolar.com
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2007
• Headcount: 11-50
• LinkedIn: ailey-solar-electric-inc-

Ailey Solar Electric, Inc. is a solar installation company based in Chicago, Illinois, specializing in renewable energy solutions for residential, commercial, and non-profit sectors. Since its inception in 2007, Ailey Solar has focused on providing solar installations and financing options that help customers reduce energy costs while transitioning to sustainable energy sources. The company prides itself on its local expertise, having served the Chicagoland area for over 16 years. Ailey Solar is dedicated to empowering communities by making solar energy accessible and affordable, particularly for historically marginalized areas. Their in-house approach to installation ensures quality and customer satisfaction, while their range of financing options, including loans and Power Purchase Agreements (PPAs), caters to various financial needs. Ailey Solar's commitment to environmental stewardship and community engagement positions it as a significant player in the solar energy industry.

11. SunVest Solar, LLC

• Website: sunvest.com
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Other (Debt), $154.0M, December 2022
• Founded year: 2009
• Headcount: 51-200
• LinkedIn: sunvest-solar-inc-

SunVest Solar, LLC is a solar energy developer based in Chicago, Illinois, specializing in the design, construction, and management of solar energy projects. Established in 2009, the company has built a solid reputation for providing tailored solar solutions aimed at reducing energy costs and promoting sustainability. SunVest serves a wide range of clients, including commercial businesses, utilities, and municipalities, and operates across multiple states in the U.S. The company has developed a significant portfolio of projects, with an impressive pipeline of nearly two gigawatts of solar development across 18 states. In December 2022, SunVest secured $154 million in funding, which underscores its financial stability and capacity for growth. Their services include community solar projects, distributed solar for commercial and industrial customers, and solar assets for utilities and cooperatives. SunVest's mission is to cultivate access to renewable energy, making them a key player in the solar energy industry.

12. Tick Tock Energy, Inc.

• Website: ticktockenergy.com
• Ownership type: Private
• Headquarters: Effingham, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2006
• Headcount: 11-50
• LinkedIn: ticktockenergy

Tick Tock Energy, Inc., based in Effingham, Illinois, specializes in renewable energy solutions with a strong emphasis on solar energy and energy efficiency. Since its inception in 2006, the company has served both residential and commercial clients, offering a variety of products such as roof-mounted and ground-mounted solar panels, LED lighting, and power management systems. Tick Tock Energy is also involved in community solar initiatives, allowing customers who may not have the ability to install solar panels on their own properties to benefit from solar energy. Their commitment to sustainability is further highlighted by their participation in programs like the Illinois Solar Renewable Energy Credits (SRECs) and their status as a Pearl-certified contractor, which signifies high-quality installation and service. The company has not reported any funding, indicating a self-sustaining business model focused on delivering energy solutions without external financial backing.

13. United American Marketing

• Website: uampower.com
• Ownership type: Private
• Headquarters: Oak Brook, Illinois, United States (USA)
• Founded year: 2013
• Headcount: 51-200
• LinkedIn: unitedamericanmarketing

United American Marketing, operating under the brand UAM Power, is an energy solutions provider based in Oak Brook, Illinois. Founded in 2013, the company focuses on renewable energy and energy efficiency services. UAM Power offers a comprehensive range of products, including solar installations, energy storage solutions, and energy supply services tailored for residential customers, businesses, municipalities, and non-profits. A notable aspect of their operations is the Unity Solar Group, a division dedicated to the development and installation of solar energy systems. UAM Power has expanded its reach across multiple states and has engaged in significant partnerships to enhance its service offerings. Their mission emphasizes democratizing renewable energy, making it accessible and affordable for all, which is reflected in their community solar subscription programs. UAM Power has also been recognized for its rapid growth, being listed on the INC.5000 list, showcasing their impact in the renewable energy sector.

14. Windfree Solar

• Website: windfree.us
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2009
• Headcount: 11-50
• LinkedIn: windfree-solar

Windfree Solar, based in Chicago, Illinois, has been a player in the solar energy sector since its founding in 2009. The company specializes in providing renewable energy solutions tailored to the needs of residential, commercial, and municipal clients. With a team of experienced professionals, Windfree Solar offers a range of services including solar installation and energy storage systems. They have successfully completed numerous projects across the Midwest, helping clients reduce energy costs and carbon footprints. Windfree Solar is also recognized as a certified Minority Owned Business and an Equity Eligible Contractor, reflecting their commitment to community and equity in energy access. Their partnership with initiatives like the Solar Switch Chicagoland program further demonstrates their dedication to making solar energy more accessible and affordable for local residents.

15. Continental Energy Solutions

• Website: cesnrg.com
• Ownership type: Family Owned
• Headquarters: Oak Brook, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2009
• Headcount: 11-50
• LinkedIn: cesnrg

Continental Energy Solutions, based in Oak Brook, Illinois, is a family-owned solar energy company that specializes in commercial solar panel installations and battery storage solutions. Since its inception in 2009, the company has focused on helping businesses and organizations in Illinois reduce their energy costs and carbon footprints through customized renewable energy systems. Their services include roof-mounted and ground-mounted solar installations, community solar projects, and microgrid solutions. With a dedicated team of engineers, project managers, and certified installation professionals, Continental Energy Solutions has successfully completed over 90 solar PV projects and installed more than 350 electric vehicle chargers. The company is also actively involved in promoting solar and battery incentives for businesses in Illinois, showcasing their commitment to advancing clean energy solutions. Their operational focus on energy management and maintenance services further enhances their position in the solar energy sector.

16. Iconic Energy

• Website: iconicnrg.com
• Ownership type: Family Owned
• Headquarters: Rockford, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2015
• Headcount: 11-50
• LinkedIn: iconicnrg

Iconic Energy is a family-owned solar energy company based in Rockford, Illinois, established in 2015. The firm specializes in the installation and maintenance of solar panels for residential, commercial, and agricultural clients. With a mission to provide clean and affordable electricity, Iconic Energy aims to help customers reduce their energy costs and carbon footprint. The company prides itself on its local roots, emphasizing a commitment to the community it serves. Their team is knowledgeable about the latest solar technologies and incentives, ensuring clients receive the best possible service and information. Iconic Energy also offers additional services such as solar maintenance and EV charging station installations, further solidifying their role in the solar energy sector.

17. TruHome Pros LLC.

• Website: truhome-pros.com
• Ownership type: Private
• Headquarters: Schaumburg, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2020
• Headcount: 11-50
• LinkedIn: truhome-pros

TruHome Pros LLC, based in Schaumburg, Illinois, is a private company specializing in solar installation and roofing services. Established in 2020, the firm serves homeowners across Illinois, Wisconsin, and Michigan. TruHome Pros aims to assist clients in reducing energy costs while increasing the value of their properties through solar panel installations and maintenance. The company also offers roofing services, creating a unique solar and roofing program that allows homeowners to address both needs simultaneously. With a team of 15 employees, TruHome Pros is dedicated to providing quality service and energy-efficient solutions, ensuring that each installation meets the specific needs of the home. Their focus on customer education and satisfaction is evident in their approach, which includes consultations, site inspections, and ongoing support. TruHome Pros has garnered positive reviews from customers, highlighting their professionalism and commitment to service.

18. Amps

• Website: amps-db.com
• Ownership type: Private
• Headquarters: Downers Grove, Illinois, United States (USA)
• Employee distribution: United States (USA) 89%, India 11%
• Founded year: 2022
• Headcount: 11-50
• LinkedIn: amps-db

Amps Power Solutions, founded in 2022 and based in Downers Grove, Illinois, is a private construction and engineering company that specializes in energy solutions. With a team of 11-50 employees, Amps focuses on providing comprehensive services in solar system design, electrical gear procurement, and combined heat and power systems. Their clientele spans various sectors, including manufacturing, multifamily housing, and entertainment, all seeking efficient energy solutions. Amps is particularly noted for its solar energy offerings, which include full system design, one-line and three-line diagrams, procurement, and installation. The company leverages proprietary technology and engineering expertise to deliver tailored energy solutions, ensuring that clients receive optimal outcomes for their energy needs. Their projects, such as the installation of solar systems in multifamily complexes and commercial facilities, highlight their active role in the solar energy industry.

19. ENGIE Distributed Renewables

• Website: engiedistributedrenewables.com
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2008
• Headcount: 51-200
• LinkedIn: engie-distributed-renewables

ENGIE Distributed Renewables, a part of ENGIE North America, is an energy solutions provider based in Chicago, Illinois. Founded in 2008, the company specializes in renewable energy and energy efficiency, with a strong emphasis on solar power. ENGIE offers a range of services that include the development, construction, and operation of solar projects, as well as wind and energy storage solutions. They cater to a variety of clients, including public institutions and commercial businesses, helping them transition to sustainable energy while achieving cost savings and environmental objectives. With over 400 MW of distributed solar and 1.5 GWh of storage under management, ENGIE is actively involved in the solar energy sector, contributing to the decarbonization efforts across the United States.

20. Cultivate Power

• Website: cultivate-power.com
• Ownership type: Venture Capital
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Series A, $10.0M, October 2023
• Founded year: 2022
• Headcount: 11-50
• LinkedIn: cultivate-power

Cultivate Power is a renewable energy developer based in Chicago, Illinois, specializing in solar and storage projects. Founded in 2022, the company focuses on creating community-integrated solar farms that not only provide clean energy but also deliver economic benefits to local communities. Cultivate Power collaborates closely with landowners and regional partners to ensure that their projects align with the unique needs of each community. Their initiatives include scholarship programs and workforce development, aimed at enhancing local economies while addressing climate challenges. Recently, Cultivate Power secured a $10 million Series A funding round, which will support the expansion of their solar and storage projects across the United States. With a dedicated team of professionals experienced in renewable energy development, Cultivate Power is committed to strengthening communities and promoting climate stability through distributed clean energy solutions.

21. New Generation Power

• Website: newgenpower.com
• Ownership type: Private
• Headquarters: Chicago, Illinois, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2009
• Headcount: 11-50
• LinkedIn: new-generation-power

New Generation Power, founded in 2009 and based in Chicago, Illinois, is a private renewable energy company dedicated to providing sustainable energy solutions. The firm operates across multiple continents, focusing on various renewable energy sources, including solar, wind, hydro, biomass, and geothermal. They serve a range of clients, including businesses and government entities, with a mission to combat climate change and promote a low-carbon future. Notably, New Generation Power has developed significant solar projects, such as the Rockford Solar Farm, which is recognized as one of the largest commercial airport solar farms in the United States. Their portfolio also includes a substantial contract with the U.S. Army for clean energy projects, showcasing their capability and commitment to renewable energy development. With a team of around 41 employees, they leverage their expertise to innovate and implement clean technologies that address global energy demands while reducing environmental impacts.

Solar Energy Insights: Key Companies in Illinois

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