Connecticut's renewable energy sector is gaining traction as organizations increasingly focus on sustainable practices. This industry features a mix of solar developers, energy management firms, and investment companies that offer tailored solutions for various clients, including residential, commercial, and governmental entities. With escalating demand for clean energy and state initiatives supportive of renewables, the industry is poised for robust growth. Furthermore, innovators are prioritizing energy efficiency and corporate social responsibility, pushing the boundaries of technology. Given global shifts toward sustainability, Connecticut’s renewable energy sector is evolving into an interesting arena for investment and growth opportunities.

The listed renewable energy companies in Connecticut reflect a blend of sizes and specializations, ranging from small firms with fewer than 10 employees to those with hundreds of staff. Predominantly headquartered across various cities in the state, these companies were founded between 1985 and 2022. Many focus on solar energy solutions, integrating aspects like energy efficiency and sustainable practices into their services. Some notable entities include Greenskies Clean Focus and Verogy, known for their innovative approaches and extensive project portfolios. This selection illustrates the dynamic nature of Connecticut’s commitment to renewable resources.

Continue reading to discover the top renewable energy companies in Connecticut.

Top 19 Renewable Energy Companies in Connecticut

1. Greenskies Clean Focus

• Website: greenskies.com
• Ownership type: Private Equity
• Headquarters: North Haven, Connecticut, United States (USA)
• Employee distribution: United States (USA) 98%, Other 2%
• Latest funding: October 2023
• Founded year: 2009
• Headcount: 51-200
• LinkedIn: greenskies-clean-energy

Greenskies Clean Focus is a solar energy provider based in North Haven, Connecticut, established in 2009. The company specializes in renewable energy solutions tailored for municipalities, schools, nonprofits, and commercial entities. Greenskies offers a comprehensive suite of services, including project financing, operations and maintenance, and solar installations. Their approach allows clients to transition to solar energy without any upfront investment, thereby reducing energy costs and carbon footprints. With a focus on long-term partnerships, Greenskies has developed and constructed over 320 MW of renewable energy facilities across more than 600 sites in 19 states. They have been recognized as the top commercial solar developer in the Northeast and are ranked among the top three in the U.S. for cumulative kW installed. Greenskies operates with a vertically integrated model, managing the entire process from project origination to long-term operation, which enhances their efficiency and reliability in the renewable energy market.

2. Ross Solar, a ConEdison Solutions Company

• Website: rosssolar.com
• Ownership type: Private
• Headquarters: Brookfield, Connecticut, United States (USA)
• Founded year: 2007
• Headcount: 11-50
• LinkedIn: ross-solar-group

Ross Solar, a ConEdison Solutions Company, is a renewable energy provider based in Brookfield, Connecticut. Established in 2007, the company specializes in solar energy systems, catering to a wide range of clients, including government agencies, educational institutions, and commercial businesses. Ross Solar focuses on helping its clients achieve energy efficiency and sustainability goals through innovative energy management solutions. The company is known for its expertise in designing and implementing solar energy systems that not only reduce energy costs but also contribute to environmental sustainability. As part of ConEdison Solutions, Ross Solar benefits from a larger network and resources, allowing it to enhance its service offerings and expand its reach in the renewable energy sector.

3. Sandbrook Capital

• Website: sandbrook.com
• Ownership type: Private
• Headquarters: Stamford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 76%, United Kingdom (UK) 18%, Germany 6%
• Founded year: 2021
• Headcount: 11-50
• LinkedIn: sandbrookcapital

Sandbrook Capital is a private investment firm based in Stamford, Connecticut, founded in 2021. The firm is dedicated to transforming the world's energy infrastructure by investing in renewable energy and climate-related projects. With a focus on partnering with entrepreneurs, Sandbrook aims to build companies that not only address climate change but also provide strong financial returns. As of March 31, 2024, Sandbrook Capital manages $2 billion in limited partner capital and has raised an additional $2 billion for its Climate Infrastructure Fund. The firm has been involved in 172 clean energy projects, generating 88 GWh of renewable energy. Sandbrook Capital's strategy emphasizes responsible investment, ensuring that their financial decisions align with positive environmental impacts. Their portfolio includes companies like NeXtWind, rPlus, Voltwise, and Havfram, which are all engaged in various aspects of clean energy production and infrastructure development.

4. Think Energy

• Website: thinkenergy.com
• Ownership type: Corporate
• Headquarters: Westport, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: September 2022
• Founded year: 2011
• Headcount: 11-50
• LinkedIn: think-energy

Think Energy, founded in 2011 and based in Westport, Connecticut, is an energy provider that focuses on clean electricity solutions. The company offers a range of services, including competitive electricity plans and community solar options, aimed at residential consumers. Think Energy is dedicated to sustainability, as evidenced by their commitment to offsetting carbon emissions and promoting renewable energy sources. They provide customers with the opportunity to offset their electricity consumption through renewable energy certificates generated from wind, solar, and hydro resources. Additionally, Think Energy has partnered with organizations to protect rainforests, further emphasizing their environmental commitment. The company operates in multiple states across the U.S., making clean energy accessible to a broader audience.

5. Lodestar Energy

• Website: lodestarenergy.com
• Ownership type: Private
• Headquarters: Avon, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2014
• Headcount: 11-50
• LinkedIn: lodestar-energy

Lodestar Energy, based in Avon, Connecticut, is a private solar energy developer that specializes in renewable energy solutions. Founded in 2014, the company has built a reputation for partnering with landowners, municipalities, and housing authorities to develop solar projects that yield energy savings and lower CO2 emissions. With a strong commitment to sustainable development, Lodestar has successfully completed numerous solar installations across the Northeast United States. Their project portfolio includes innovative solutions such as solar carports and ground-mounted arrays, showcasing their ability to adapt to various site conditions. Lodestar has developed and financed over $300 million in solar projects, demonstrating their capacity to manage significant investments in the renewable energy sector. The company is actively engaged in expanding its project pipeline, with approximately 100 MW of solar projects in development, indicating a robust growth trajectory in the renewable energy market.

6. Verogy

• Website: verogy.com
• Ownership type: Private
• Headquarters: West Hartford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Other (Debt), April 2022
• Founded year: 2017
• Headcount: 11-50
• LinkedIn: verogy

Verogy, founded in 2017 and based in West Hartford, Connecticut, is a private solar energy company dedicated to providing renewable energy solutions. With a team that boasts over 75 years of combined experience in the solar industry, Verogy specializes in project development, EPC services, and solar financing. They cater to a variety of clients, including businesses, municipalities, and organizations, helping them transition to solar power. Their services are designed to reduce energy costs while enhancing environmental sustainability. Verogy's approach includes managing the entire lifecycle of solar projects, from initial design and planning to ongoing operations and maintenance. They also assist clients in navigating solar incentives and financing options, ensuring that projects are both economically viable and environmentally beneficial.

7. MSL Group Inc.

• Website: mslgroupinc.com
• Ownership type: Private
• Headquarters: Manchester, Connecticut, United States (USA)
• Employee distribution: United States (USA) 65%, China 35%
• Founded year: 1988
• Headcount: 1-10
• LinkedIn: msl-group-inc.

MSL Group Inc., based in Manchester, Connecticut, is a private company founded in 1988. It specializes in real estate development and renewable energy solutions. The firm offers a range of services, including multi-family housing projects, solar energy initiatives, and consulting for energy efficiency. MSL Group has been involved in the renewable energy sector since 2015, focusing on solar power generation, fuel cells, and biomass energy. In 2022, they were developing six solar projects and three fuel cell projects, with a total capacity of 2.74 megawatts. Their clientele includes property owners and businesses seeking sustainable energy solutions, highlighting their role in promoting energy efficiency and renewable energy adoption. MSL Group also engages in smart city projects, further emphasizing their commitment to creating sustainable environments.

8. Telyon

• Website: telyon.com
• Ownership type: Private
• Headquarters: Old Saybrook, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: August 2023
• Founded year: 2017
• Headcount: 11-50
• LinkedIn: teloscompanies

Telyon is a private renewable energy company based in Old Saybrook, Connecticut, specializing in solar energy solutions. Established in 2017, Telyon offers a range of services including project development, execution, and asset management, aimed at helping businesses implement sustainable energy practices. The company collaborates with notable brands to assist them in achieving their corporate social responsibility objectives. Telyon's team consists of experienced professionals who have previously contributed to the growth of Greenskies Renewable Energy, a significant player in the commercial and industrial solar sector. Their strategic partnership with Greenbacker Capital allows them to provide comprehensive solutions, ensuring clients receive the confidence and support needed for successful project execution. Telyon is dedicated to addressing climate change through innovative solar energy solutions, making them a relevant entity in the renewable energy industry.

9. EcoSmart Home Services

• Website: ecosmartct.com
• Ownership type: Private
• Headquarters: Berlin, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1985
• Headcount: 11-50
• LinkedIn: ecosmart-home-services

EcoSmart Home Services, based in Berlin, Connecticut, has been a prominent player in the home improvement industry since its establishment in 1985. The company specializes in energy efficiency solutions, offering a wide range of services that include solar panel installations, energy audits, HVAC systems, insulation, and electrical work. With a focus on helping homeowners reduce energy costs and enhance comfort, EcoSmart is dedicated to sustainable practices. Their solar services allow clients to harness clean energy, while their energy audits identify areas for improvement in energy consumption. The company prides itself on educating customers about energy efficiency and providing tailored solutions that meet individual needs. EcoSmart's commitment to eco-friendly practices and customer satisfaction has solidified its reputation in the Connecticut market, making it a trusted partner for homeowners seeking to improve their energy efficiency and reduce their environmental impact.

10. Energywell

• Website: energywell.com
• Ownership type: Private
• Headquarters: Westport, Connecticut, United States (USA)
• Employee distribution: United States (USA) 70%, Canada 25%, Tunisia 6%
• Founded year: 2021
• Headcount: 11-50
• LinkedIn: energywell

Energywell is an energy technology company based in Westport, Connecticut, specializing in sustainable energy solutions. Founded in 2021, the company has quickly established itself with its Proton platform, a cloud-based technology designed for energy management. This platform addresses the challenges of connecting modern consumers with renewable energy sources and aging electricity grids. Energywell's clientele includes energy retailers and consumers looking for innovative energy solutions. The company also operates Think Community Solar, which focuses on expanding access to community solar projects across multiple states. With a team of seasoned energy industry veterans and backing from notable financial partners, Energywell aims to scale its operations through strategic acquisitions and product development, all while prioritizing customer experience and sustainability.

11. Energy Resources USA

• Website: energyresourcesusa.net
• Ownership type: Private
• Headquarters: Thomaston, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2011
• Headcount: 51-200
• LinkedIn: energy-resources-usa

Energy Resources USA, founded in 2011 and based in Thomaston, Connecticut, is a private company that specializes in energy efficiency and renewable energy solutions. With a workforce of approximately 25 employees, the firm provides a range of services aimed at helping clients reduce energy costs and enhance operational efficiency. Their offerings include electric vehicle charging stations, LED lighting solutions, mechanical equipment controls, refrigeration optimization, steam optimization, and solar energy solutions. The company serves various sectors, including commercial, education, healthcare, manufacturing, and nonprofits, demonstrating its capability to address the energy needs of different industries. Energy Resources USA partners with utility companies to implement comprehensive energy conservation measures, ensuring that projects are financially viable and environmentally beneficial. Their approach includes conducting energy assessments, analyzing facility data, and managing the installation of energy-saving technologies, all while navigating available utility incentives to minimize costs for clients.

12. Smart Roofs Energy

• Website: smartroofssolar.com
• Ownership type: Private
• Headquarters: Monroe, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2013
• Headcount: 11-50
• LinkedIn: smart-roofs-solar

Smart Roofs Energy, based in Monroe, Connecticut, is a private renewable energy service company founded in 2013. With a team of 21 employees, the company focuses on delivering commercial solar energy solutions. Their offerings include solar panel installations, energy storage systems, and electric vehicle (EV) charging stations. Smart Roofs Energy serves a variety of clients, including businesses, municipalities, and non-profits, helping them to lower their utility costs and transition to sustainable energy sources. The company operates nationwide, emphasizing a customer-centric approach that includes a free energy analysis to tailor solutions to individual client needs. Smart Roofs Energy has been recognized for its growth and impact in the industry, having been named a top solar company in the United States and a top overall company in Connecticut by Inc. 5000. Their commitment to innovation and customer satisfaction is evident in their comprehensive service offerings, which cover the entire process from design to installation and ongoing management of solar energy systems.

13. Phibro LLC

• Website: phibro.com
• Ownership type: Corporate
• Headquarters: Stamford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 78%, Belgium 22%
• Latest funding: October 2009
• Founded year: 1901
• Headcount: 11-50
• LinkedIn: mycompany

Phibro LLC, based in Stamford, Connecticut, is a commodity trading company established in 1901. The firm specializes in low carbon and renewable energy solutions, providing products such as renewable gas, clean hydrogen, and sustainable fuels. Phibro serves various sectors, including energy, agriculture, and transportation, assisting businesses in their transition to cleaner energy sources. The company has developed a robust platform for commodity merchanting, focusing on investments in low-carbon products and projects. Their core activities include generating power from renewable sources and producing renewable diesel and sustainable aviation fuel. Phibro's commitment to renewable energy is evident in their strategic focus on optimizing renewable assets and structuring contracts that support the growth of clean energy markets.

14. CTEC Solar

• Website: ctecsolar.com
• Ownership type: Private
• Headquarters: Windsor, Connecticut, United States (USA)
• Employee distribution: United States (USA) 94%, Germany 6%
• Founded year: 2010
• Headcount: 51-200
• LinkedIn: c-tec-solar-llc-

CTEC Solar, based in Windsor, Connecticut, is a private solar energy company that specializes in renewable energy solutions, including solar project development and energy storage. Established in 2010, CTEC Solar has built a reputation for delivering comprehensive services that span engineering, construction, and ongoing maintenance. The company serves a variety of clients, including utilities, solar developers, and property owners, ensuring that each project is tailored to meet specific needs. With a focus on cost-effective and sustainable energy solutions, CTEC Solar has developed and constructed over 100 MW of utility-scale and commercial solar projects across the United States. Their expertise extends to energy storage design and optimization, which is increasingly important in today's energy market. CTEC Solar's commitment to community involvement is reflected in their partnerships with local organizations, creating job opportunities and fostering positive relationships in the areas they serve.

15. Titan Energy

• Website: titanenergyne.com
• Ownership type: Corporate
• Headquarters: Hartford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 74%, Democratic Republic of the Congo 9%, Mexico 9%, Other 9%
• Latest funding: December 2014
• Founded year: 2001
• Headcount: 11-50
• LinkedIn: titanenergynewengland

Titan Energy, founded in 2001 and based in Hartford, Connecticut, is an energy consulting firm that provides comprehensive energy management solutions. The company serves a wide range of clients, including educational institutions, healthcare facilities, and government entities, focusing on optimizing energy procurement and enhancing efficiency strategies. Titan Energy's offerings include energy procurement, demand response, data management, and on-site generation technologies such as solar power and combined heat and power (CHP) systems. They also engage in community solar projects and energy efficiency initiatives, helping clients reduce energy costs while promoting sustainable practices. Titan Energy's commitment to environmental, social, and governance (ESG) compliance further underscores their role in the renewable energy sector, as they assist organizations in achieving their sustainability goals through innovative energy solutions.

16. SunEnergy1

• Website: sunenergy1.com
• Ownership type: Venture Capital
• Headquarters: Stamford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: December 2024
• Founded year: 2009
• Headcount: 201-500
• LinkedIn: sunenergy1

SunEnergy1, based in Stamford, Connecticut, is a solar energy developer that specializes in commercial solar project development. Since its inception in 2009, the company has focused on providing comprehensive services that include engineering, procurement, construction, and operations for solar facilities. With a workforce of approximately 133 employees, SunEnergy1 has successfully constructed over 1 GW of solar projects and boasts a pipeline of 14 GW, indicating a strong capacity for future growth. The company operates a vertically integrated model, which allows it to control all stages of solar project development, from land acquisition to maintenance. This approach not only streamlines operations but also ensures competitive pricing for its corporate and institutional clients. SunEnergy1 is also committed to community engagement, having donated over $5 million to various causes, which underscores its dedication to sustainable development and social responsibility.

17. Prime Energy Solar

• Website: primeenergysolar.com
• Ownership type: Private
• Headquarters: Milford, Connecticut, United States (USA)
• Employee distribution: United States (USA) 93%, Pakistan 7%
• Founded year: 2018
• Headcount: 11-50
• LinkedIn: prime-energy-solar

Prime Energy Solar, based in Milford, Connecticut, is a private solar energy company established in 2018. With a workforce of approximately 43 employees, the company specializes in solar panel installations for both residential and commercial clients. They aim to help customers reduce energy costs and achieve sustainability through their services. In addition to solar installations, Prime Energy Solar also provides HVAC and roofing services, enhancing their value proposition to clients. The company operates with a strong focus on customer satisfaction, offering tailored solutions and financing options that require no upfront costs. Their mission is to transform homes into energy-efficient spaces, promoting a future of energy independence and environmental responsibility. Prime Energy Solar collaborates with reputable manufacturers to ensure high-quality installations and has garnered positive reviews for their service and support.

18. Empower Energy Solutions

• Website: empowerenergy.co
• Ownership type: Private
• Headquarters: Darien, Connecticut, United States (USA)
• Employee distribution: United States (USA) 84%, United Arab Emirates 5%, Pakistan 5%, Other 5%
• Founded year: 2013
• Headcount: 51-200
• LinkedIn: empower-energy-solutions-inc

Empower Energy Solutions, founded in 2013 and based in Darien, Connecticut, is a private solar energy provider. The company specializes in offering a range of solar energy solutions, including the installation of solar panels and various financing options tailored for both residential and commercial clients. Empower Energy Solutions aims to help customers reduce their energy expenses while contributing to environmental sustainability through renewable energy initiatives. With a workforce of approximately 114 employees, the company has built a reputation for its customer-centric service model, which includes a comprehensive project workflow from consultation to installation. Their commitment to quality is evident in their choice of high-grade solar panels and a focus on creating a positive impact in the communities they serve. Empower Energy Solutions also emphasizes the importance of educating customers about their environmental impact and the benefits of solar energy.

19. Everlast Energy

• Website: everlastenergyct.com
• Ownership type: Private
• Headquarters: Manchester, Connecticut, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2022
• Headcount: 11-50
• LinkedIn: everlast-energy

Everlast Energy, based in Manchester, Connecticut, is a solar energy company that specializes in renewable energy solutions tailored for residential and commercial customers. Founded in 2022, the company has quickly positioned itself in the solar market by offering services such as solar panel installations and energy storage solutions. With a team that boasts over 30 years of collective experience in the solar industry, Everlast Energy aims to help clients reduce their energy costs and environmental impact. They operate primarily in Connecticut, Massachusetts, and Rhode Island, focusing on building strong relationships with local communities. The company prides itself on providing a personal touch, emphasizing face-to-face interactions and educational support to guide customers through the solar installation process. Their commitment to customer service is further reflected in their special discounts for veterans and active-duty military members, showcasing their dedication to community support. Everlast Energy's approach to solar energy is not just about installations; it’s about empowering individuals to take control of their energy needs and contribute to a sustainable future.

Renewable Energy Insights: Key Companies in Connecticut

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