The geothermal energy industry in Connecticut is a collaboration of diverse companies with a shared vision for sustainable and renewable energy. These firms vary in size and scop, ranging from burgeoning local start-ups like Evergreen Energy to larger corporations such as AVANGRID. They provide a range of services including installing geothermal heating and cooling systems in homes and businesses, and supplying power from sustainable resources. Amid increasing climate concerns, the industry is pacing towards immense growth, making geothermal a strong contender in the evolving energy landscape.


Top 20 geothermal energy companies in Connecticut

1. Evergreen Energy

Evergreen Energy was founded by Rich & Sharon Vocke in March 2006. Both had been interested in solar power since the last energy crisis in the 1970's. In 2005 they installed a 6 kilowatt solar photovoltaic array on their home in Southington, Connecticut. They were so pleased with the result, they were inspired to help other homeowners and businesses install renewable energy systems and Evergreen Energy was born. Shortly thereafter, they installed a geothermal heating and cooling system in their home and decided to expand the business to offer multiple renewable technologies. Wind energy was a natural addition to the menu where there's an appropriate wind resource. Their goal is to meet the specific needs of each of their clients by providing various renewable energy options.


2. 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.


3. Viridian International Management

  • Website: viridian.com
  • Headquarters: Norwalk, Connecticut, United States
  • Founded: 2009
  • Headcount: 11-50
  • LinkedIn

Viridian is a company that offers products and services related to energy, environmental disclosures, and customer care. They provide solutions for individuals and businesses who are seeking environmentally friendly and sustainable options for their energy needs.


4. 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.


5. Daniels Energy

Daniels Energy is a company that offers energy solutions and services. They specialize in providing innovative and sustainable energy solutions to customers, helping them reduce their carbon footprint and lower energy costs. With a focus on renewable energy sources, Daniels Energy aims to create a more sustainable future for businesses and individuals.


6. 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.


7. Energywell

Energywell is a sustainable energy company that offers a best-in-class platform powered by their proprietary technology, Proton. Their experienced team of energy industry veterans aims to scale quickly through strategic acquisitions and innovative product development.


8. Counterpointe Sustainable Real Estate LLC

  • Website: counterpointesre.com
  • Headquarters: Greenwich, Connecticut, United States
  • Founded: 2014
  • Headcount: 11-50
  • Latest funding type: Series C
  • LinkedIn

CounterpointeSRE is a company that focuses on sustainable energy finance and provides capital for renewable energy production and energy efficiency projects in commercial buildings. They specialize in financing the construction of new 'greener' buildings and the retrofit of existing properties, directly addressing climate change and bringing efficiency and renewable measures to residential and commercial buildings.


9. American GreenFuels LLC

American GreenFuels is the largest biodiesel producer that specializes in providing premium biodiesel produced from plant oils and recycled waste materials. They continuously create more biodiesel for a cleaner environment in the Northeast United States. Their biodiesel is clean, safe, and made in America.


10. Verdek

  • Website: verdek.com
  • Headquarters: Madison, Connecticut, United States
  • Founded: 2008
  • Headcount: 11-50
  • LinkedIn

Verdek Green Technologies Corp. is a leading solution-driven company that specializes in electric vehicle charging and CNG/LNG infrastructure for sustainable transportation. They offer EV charging stations, CNG/LNG products, virtual pipeline solutions, and turnkey solutions. Their innovative technologies help reduce greenhouse gas emissions and provide clean energy solutions. They serve a wide range of customers, including fleets, ferries, tug boats, trains, and more. Verdek is committed to delivering high-performance products with a small footprint and lower operating costs compared to traditional LNG plants.


11. Environmental Energy Services, Inc.

  • Website: eescorp.com
  • Headquarters: Sandy Hook, Connecticut, United States
  • Founded: 1992
  • Headcount: 11-50
  • Latest funding type: Debt Financing
  • LinkedIn

Environmental Energy Services Corporation (EES) is a clean energy company specializing in combustion enhancement, boiler performance optimization, emissions reduction, and water treatment technology. They offer innovative chemistry and engineering solutions for energy facilities worldwide.


12. Starwood Energy Group

Starwood Energy Group is an investment company focused on the energy sector. They offer funding and support to energy projects, primarily in the renewable and natural gas markets. With a team of experienced professionals, they provide expertise in project development, financing, and asset management.


13. 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.


14. 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.


15. Cadenza Innovation, Inc.

  • Website: cadenzainnovation.com
  • Headquarters: Danbury, Connecticut, United States
  • Founded: 2012
  • Headcount: 11-50
  • Latest funding type: Corporate Round
  • LinkedIn

Cadenza Innovation is a provider of supercell technology for the cell, module, and pack/rack, offering safe, reliable, and high-energy density solutions at low cost for EV, PHEV, energy storage, and telecom markets.


16. Quantum Biopower

Quantum Biopower provides sustainable solutions to manage organic waste streams using advanced technologies to make products that add value; this value benefits us all.


17. US Power Generating Company

  • Website: uspowergen.com
  • Headquarters: Stamford, Connecticut, United States
  • Founded: 2005
  • Headcount: 51-200
  • LinkedIn

US Power Generation LLC is a power generation company offering energy solutions to its customers.


18. Valley Energy Co.

Valley Energy Co is a company that offers energy solutions and services focused on sustainable development and carbon reduction.


19. NuSTREEM | Hydropower Technology

  • Website: nustreem.com
  • Headquarters: Mansfield Center, Connecticut, United States
  • Founded: 2014
  • Headcount: 11-50
  • LinkedIn

NuSTREEM LLC is a US-based hydropower technology company that manufactures modern, modular, and intelligent hydroelectric turbines to enable sustainable development with low-cost hydropower systems and solutions.


20. SolarFlexes

SolarFlexes is a company that offers renewable energy solutions to individuals and businesses to help accelerate the transition to a clean economy.


Want to find more geothermal energy companies?


If you want to find more companies that offer a range of energy solutions, prioritizing sustainability and efficiency you can do so with Inven. This list was built with Inven and there are hundreds of companies like these globally.


With Inven you'll also get to know the company's:


  • Ownership: Which of these are private equity backed? Which are family-owned?
  • Contact data: Who are the owners and CEO's? What are their emails and phone numbers?
  • Financials: How do these companies perform financially? What are their revenues and profit margins?

...and a lot more!