Connecticut's solar energy industry is thriving with businesses operating at various stages of the solar power chain. These outfits range from manufacturers of solar systems to development, construction, and maintenance of renewable-energy projects. They offer comprehensive services including but not limited to solar panel production, rack system development, and active management of renewable energy grids. The evolution of technology coupled with Connecticut's proactive stance on clean energy has even fostered companies that generate and deliver energy from sustainable, renewable sources. To keep this momentum, innovative solutions to make solar energy more affordable are being developed. Looking forward, the continued growth and innovation of this sector in Connecticut seem boundless.


Top 25 solar power companies in Connecticut

1. AVANGRID, Inc. (formerly UIL Holdings Corporation)

  • Website: avangrid.com
  • Headquarters: Orange, Connecticut, United States
  • Founded: 1852
  • Headcount: 5001-10000
  • LinkedIn

Avangrid is a leading clean energy company that generates and delivers energy from sustainable, renewable sources. They actively work to protect and enhance the natural environment.


2. GameChange Solar

  • Website: gamechangesolar.com
  • Headquarters: Norwalk, Connecticut, United States
  • Founded: 2012
  • Headcount: 51-200
  • Latest funding type: Series Unknown
  • LinkedIn

GameChange Solar is a company that is changing the world by making solar energy affordable. They offer innovative solar racking systems and solutions to maximize solar energy production.


3. Louth Callan Renewables

Louth Callan Renewables develops, constructs, and maintains clean, renewable-energy projects in the United States, specializing in solar solutions. They offer workmanship warranties and operations and management agreements to ensure optimal functioning of the systems. LCR procures top-level equipment manufacturers and investment-grade panels for their projects.


4. Specialized Technology Resources, Inc.

  • Website: strsolar.com
  • Headquarters: Enfield, Connecticut, United States
  • Founded: 1944
  • Headcount: 201-500
  • Latest funding type: Ipo
  • LinkedIn

STR Holdings, Inc. is a global leader in solar panel encapsulation, offering environmentally-responsible solutions through research and innovation.


5. Altus Power, Inc.

  • Website: altuspower.com
  • Headquarters: Stamford, Connecticut, United States
  • Founded: 2009
  • Headcount: 51-200
  • Latest funding type: Post Ipo Debt
  • LinkedIn

Altus Power offers locally-sited solar generation, energy storage, and EV-charging stations to customers across the U.S. Find savings and reliable renewable energy for commercial, industrial, public sector, and Community Solar customers.


6. Greenskies Clean Focus

  • Website: greenskies.com
  • Headquarters: North Haven, Connecticut, United States
  • Founded: 2009
  • Headcount: 51-200
  • Latest funding type: Acquired
  • LinkedIn

Greenskies is a vertically-integrated solar energy company offering decarbonization solutions like onsite and offsite solar, battery storage, microgrids, and CCHP. They are dedicated to quality and operational excellence and work with commercial, public sector, and utility energy users throughout the US. With a single delivery team, Greenskies originates, develops, constructs, and operates renewable energy facilities.


7. Greenworks Lending from Nuveen

  • Website: greenworkslending.com
  • Headquarters: Darien, Connecticut, United States
  • Founded: 2015
  • Headcount: 51-200
  • Latest funding type: Acquired
  • LinkedIn

Greenworks Lending is a company that offers financing solutions for energy efficiency projects. They specialize in C-PACE (Commercial Property Assessed Clean Energy) financing, which allows property owners to fund upgrades and improvements with no upfront costs. Their services include project types such as new construction, gut rehabs, energy efficient upgrades, solar and renewables, and recapitalization for recently completed projects. They also provide resources like case studies, available states, and FAQs. Greenworks Lending aims to make the world greener by providing loans for sustainable projects.


8. Green Street Power Partners

  • Website: gspp.com
  • Headquarters: Stamford, Connecticut, United States
  • Founded: 2000
  • Headcount: 11-50
  • LinkedIn

Green Street Power Partners (GSPP) is a company that focuses on acquiring, financing, and developing solar energy systems across the nation. They offer community solar solutions and aim to power tomorrow with clean and sustainable energy.


9. CTEC Solar

  • Website: ctecsolar.com
  • Headquarters: Windsor, Connecticut, United States
  • Founded: 2010
  • Headcount: 51-200
  • LinkedIn

CTEC Solar is a company that specializes in the development and installation of utility-scale solar projects in the Northeast. They offer a range of solutions for commercial and residential customers, including solar farms, rooftops, carports, and residential homes.


10. Sunzer0

  • Website: sunzer0.com
  • Headquarters: New York, Connecticut, United States
  • Founded: 2020
  • Headcount: 51-200
  • LinkedIn

Sunzer0 is a clean energy transition company that provides solar installations for residential and commercial buildings. They offer high power output and battery storage to reduce electricity bills and provide sustainable energy solutions.


11. PurePoint Energy

PurePoint Energy is a solar energy company that specializes in providing superior, customized solar energy installations and energy storage solutions for agricultural properties, commercial properties, and non-profits. They offer free consultations and support post-installation, serving clients nationwide in the United States. Whether for apartment buildings, warehouses, schools, or non-profit facilities, PurePoint Energy helps businesses get started with solar panels and offers grants for nonprofit organizations.


12. Ion Solar Pros

Ion Solar Pros is a solar energy solutions provider that helps customers produce, store, and generate revenue for years to come. They offer customized solar systems for residential and commercial properties, along with end-to-end support. The company's goal is to provide customers with sustainable power and significant savings.


13. Verogy

  • Website: verogy.com
  • Headquarters: Hartford, Connecticut, United States
  • Founded: 2017
  • Headcount: 11-50
  • Latest funding type: Debt Financing
  • LinkedIn

Verogy is a renewable energy company that specializes in solar project development. They offer a range of services and solutions to help their clients access the benefits of solar power. Their team of experts has extensive experience in securing capital and financing for solar projects across the country. Verogy is dedicated to building a strong portfolio of solar energy projects to improve long-term environmental impact and lower electricity bills.


14. Elite Energy Consulting

Elite Solar Pros is a company that provides solar panel installations and services. They offer low-cost home solar panels with installation in Connecticut and beyond. Their mission is to promote the use of solar energy and help homeowners save money by converting to solar power.


15. Prime Energy Solar

Prime Energy Solar offers renewable energy solutions including solar installations, repairs, and roof installations to create sustainable energy and save on repairs.


16. True Green Capital Management LLC

True Green Capital Management is a specialized renewable energy infrastructure private equity firm based in Westport, Connecticut. They focus on sustainable solar and aim to deliver attractive returns for investors while remaining committed to local communities. They invest in distributed power generation projects across multiple US states and Europe, with a particular emphasis on the sub-utility scale solar power segment.


17. Ross Solar, a ConEdison Solutions Company

  • Website: rosssolar.com
  • Headquarters: Brookfield, Connecticut, United States
  • Founded: 2007
  • Headcount: 11-50
  • LinkedIn

Con Edison Solutions is a company that specializes in custom solar power systems for homes and businesses in the northeastern region. They have extensive knowledge of the local climate, incentive programs, utility requirements, and building regulations. With an in-house design team and experienced installers, they provide affordable and tailored solar solutions. Their expertise, integrity, and financial stability set them apart in the industry.


18. Soltas Energy

Soltas Energy was a developer and owner of solar power plants, later sold to focus on GameChange Solar, a company involved in fixed tilt structure and tracker business.


19. Murphy International Development LLC

Murphy International Development is a global energy project development, management and financing company offering renewable and conventional power solutions including wind, solar, hydrogen, geothermal, and biomass.


20. Gemma Power Systems, LLC

  • Website: gemmapower.com
  • Headquarters: Glastonbury, Connecticut, United States
  • Founded: 1997
  • Headcount: 51-200
  • LinkedIn

Gemma Power Systems is a company that specializes in engineering and construction for utility-scale power generation projects. They offer innovative solutions and the latest technology in combined cycle, simple cycle, and renewable/environmental power plants. With a focus on quality and safety, Gemma Power Systems delivers efficient and reliable energy solutions for their customers.


21. Powr2

  • Website: powr2.com
  • Headquarters: Bethel, Connecticut, United States
  • Founded: 2018
  • Headcount: 11-50
  • LinkedIn

POWR2 is a company that provides sustainable energy storage solutions for the clean energy industry. They offer reliable and portable power solutions for various applications and industries.


22. Solar Industry Magazine

  • Website: solarindustrymag.com
  • Headquarters: Southbury, Connecticut, United States
  • Founded: 2008
  • Headcount: 51-200

Solar Industry is a magazine that provides news and insights on the solar power industry. The publication covers the latest developments in technology, policy, and finance related to solar energy.


23. Dyna Electric, Inc.

Dynaelectric is a company that specializes in electrical construction and services. They offer a wide range of services including HVAC, power connections, lighting retrofit, telephone and data communications, and design-build construction. They also provide back-up generator systems for commercial and industrial clients. With a focus on sustainability, Dynaelectric helps businesses reduce energy costs and promote green energy solutions through the installation of solar panel systems.


24. Apollo Solar

Apollo Solar offers power generation equipment for remote telecom sites, providing pure solar and hybrid configurations that enable telecommunications companies to deliver services in challenging locations. Their off-grid systems increase reliability and reduce power costs. They specialize in telecom power products, including solar controllers, inverters, and pre-wired panels. Apollo Solar's solutions have proven reliability in challenging environments such as jungles, deserts, mountains, and coastlines. They also offer remote monitoring for minimal downtime. Their goal is to achieve maximum reliability and efficiency while reducing operational expenses and CO2 emissions.


25. Titan Energy

Titan Energy is an energy management company that offers services such as energy procurement, demand response, data management, on-site generation, and energy efficiency. They help various customer groups including schools, universities, healthcare facilities, hospitality businesses, large commercial and industrial sectors, local and state governments, and nonprofits. Their offerings include solar, combined heat and power, fuel cell, and renewable energy credit management. They are known for their expertise in deregulated energy markets and cost reduction measures. Titan Energy is a trusted partner for organizations looking to optimize their energy usage and reduce costs.


Want to find more solar power companies?


If you want to find more companies that provide a variety of services from energy production to system maintenance you can do so with Inven. This list was built with Inven and there are hundreds of companies like these globally.


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...and a lot more!