The Connecticut natural gas industry is a vibrant sector, hosting a plethora of companies that deliver an array of services. These entities range from global energy companies emphasizing energy commodities trading and asset investing to private equity firms focusing on manufacturing support and exploration of natural gas. With the world shifting towards cleaner energy sources, these firms are poised to play a significant role in the energy transition, providing environmentally friendly alternatives to other energy sources. As they continue growing and innovating, they ensure the delivery of reliable and affordable energy.


Top 22 natural gas companies in Connecticut

1. Castleton Commodities International

  • Website: cci.com
  • Headquarters: Stamford, Connecticut, United States
  • Founded: 2001
  • Headcount: 501-1000
  • LinkedIn

Castleton Commodities International (CCI) is a global energy company that specializes in energy commodities trading and infrastructure asset investing. With a focus on natural gas, power, and oil assets, CCI leverages its market expertise and operational capabilities to unlock value in energy markets. The company utilizes a data-driven approach to drive insight generation and opportunity identification.


2. First Reserve

First Reserve is a global private equity investment firm exclusively focused on the energy sector. With over 39 years of experience, they have raised over $32 billion of aggregate capital since inception. They specialize in worldwide exploration, development, and production of oil, gas, and natural gas liquids, as well as providing specialized equipment, manufacturing, and services supporting the global energy industry.


3. Iroquois Gas Transmission System, L.P.

  • Website: iroquois.com
  • Headquarters: Shelton, Connecticut, United States
  • Founded: 1985
  • Headcount: 51-200
  • Latest funding type: Corporate Round
  • LinkedIn

Iroquois Gas Transmission System is a premier natural gas transmission company serving the Northeast. They are known for their safe and highly reliable (>99%) service, and their commitment to investing in the community and the environment. They deliver a reliable and affordable source of energy that complements renewables.


4. Ppi Gas Distribution, INC.

  • Website: ppigas.com
  • Headquarters: Naugatuck, Connecticut, United States
  • Headcount: 1-10
  • LinkedIn

PPI Gas Distribution, Inc. is a North American company supplying piping systems for the natural gas industry.


5. International Oil Co

It provides industry news updates several times a day and incisive feature articles written by seasoned petroleum journalists around the world and a team of experts across the globe whose insight and technical expertise are exclusive to OGI. OGI doesn't just reproduce press releases and call it news, it delivers the news you can use sometimes minutes after it happens so you stay ahead of the game and can make the kind of informed decisions that matter in today's dynamic petroleum industry. Not only is OGI a source for timely industry news, but it is the number one website in the world for in-depth analysis of both leading edge technology and world petroleum plays. Only OGI gives you genuinely useful editorial coverage of the world of petroleum exploration and production. Contact Information:


6. Petroleum Resources Ltd

  • Website: alphapetroleum.com
  • Headquarters: Greenwich, Connecticut, United States
  • Founded: 2001
  • Headcount: 11-50
  • Latest funding type: Acquired
  • LinkedIn

Alpha Petroleum is a privately owned upstream oil and gas company operating in the North Sea. They focus on operated, development, and production activities.


7. Hawthorne Energy

  • Website: hwnenergy.com
  • Headquarters: Stamford, Connecticut, United States
  • Founded: 2020
  • Headcount: 1-10
  • Latest funding type: Private Equity
  • LinkedIn

HWN Energy Ltd is a Canadian oil and gas E&P company focused on developing and acquiring assets in the Western Canadian Sedimentary Basin.


8. VERBIO North America

  • Website: verbio.us
  • Headquarters: Stamford, Connecticut, United States
  • Founded: 2018
  • Headcount: 51-200
  • LinkedIn

VERBIO is a renewable energy company that specializes in the production of biodiesel, bioethanol, and biogas. With facilities in Nevada, Iowa, and Welland, Ontario, the company utilizes agricultural residues as feedstock for its industrial-scale renewable natural gas (RNG) production. VERBIO also plans to establish a cellulosic RNG production facility in Wellington, Kansas. The company aims to contribute to sustainable energy solutions by leveraging innovative technology and partnering with farmers.


9. Xin

  • Website: xin-corp.com
  • Headquarters: Easton, Connecticut, United States
  • Headcount: 11-50

XIN-CORP. is a holding and manufacturing corporation, investing many manufacturers all over China. From 1990, our family started the first pipe system manufacturer, still now, become a big family owned group, who are concentrating on building materials, pipe system and cables industries. Our business covers several fields such as Wire rods, Deformed steel rebar, Steel coils, Pipeline(Ductile Iron, Victaulic, GRE/GRP), Cables, Casing&Tubing, Screen&Slotted pipes, Fittings, Flanges. With many national patents, we has production lines which according with international standard and huge manufacturing capacity. Our manufacturers are capable of manufacturing products in compliance with various standards such as American standards(API/ASTM/ASME), Chinese standards (GB, JB), International Electrotechnical Commission standard (IEC) etc. We has successively been certified to ISO 9001 Quality Management System, ISO14001 Environmental Management System and OHS18001 Occupational Health and Safety Management System, and it has passed the API Q1 management certification, ISO/TS 29001 certification. Our products are widely used in power transmission, transportation, energy, petrochemical, oilfield, waste&drinking water and other industry & urban construction, etc. It is the everlasting pursuit to provide safe, reliable, energy-saving, eco-friendly and stable products and outstanding pre-sales, sales and after-sales service for users. In face of global economic integration, the company will closely rely on strong science and technology and economic strength, sincerely provide domestic and foreign clients with high-quality products and services to create a win-win future based on your help and our hard work.


10. Enviro Power Inc.

  • Website: enviropowertec.com
  • Headquarters: South Windsor, Connecticut, United States
  • Founded: 2013
  • Headcount: 11-50
  • Latest funding type: Series A
  • LinkedIn

EnviroPower specializes in providing renewable and clean energy solutions for reducing greenhouse gas emissions and lowering energy bills. Their SmartWatt Boiler converts lost heat into electricity with near-zero cost onsite generation, and can be easily installed and maintained at similar costs to traditional heating systems.


11. Peening Technologies

  • Website: peentech.com
  • Headquarters: East Hartford, Connecticut, United States
  • Founded: 1966
  • Headcount: 51-200
  • LinkedIn

Peentech.com is a company that specializes in shot peening, abrasive blasting, and surface enhancement job shop services. They cater to industries such as aerospace, automotive, power generation, wind turbine generator, medical, and oil and gas exploration. With over 50 years of experience, they provide state-of-the-art, affordable, and computer-controlled shot peening equipment and offer complete process development services.


12. Norwich Public Utilities

Norwich Public Utilities is a municipally-owned company that provides electric, water, sewer, and natural gas services in Norwich, CT. Established in 1904, the company is governed by a five-member Board of Commissioners and Sewer Authority. They offer utility services to residential and business customers, including rates, fees, meter reading information, and payment assistance. The company is committed to efficiency, offering energy efficiency programs and rebates to its customers.


13. Praxair Distribution, Inc.

LindeDirect.com offers a wide range of gas equipment and supplies for industrial use. Browse their product categories including gases, welding and cutting equipment, abrasives, safety gear, and more. They provide convenient options for purchasing and payment, with the ability to buy with a credit card or set up Linde credit terms.


14. True Position Manufacturing

  • Website: truepositionmfg.com
  • Headquarters: South Windsor, Connecticut, United States
  • Headcount: 1-10

True Position was founded in 1999 with the belief that we could provide for our customers the highest level of quality and service, in conjunction with low cost. We have been dedicated to that philosophy through efficient manufacturing processes, low overhead, and establishing a quality system that provides for not one QC inspector but everyone in the company as QC inspectors. We believe we have succeeded in this philosophy as all of customers QC departments love our parts. Our low cost structure allows for our customers to leverage off of us to increase their capacity and add to the bottom line without new capital investment. We specialize in what we refer to as small parts. That is, parts that are generally manufactured from bar material or slugs that are 4 round or less. We provide both CNC turning and milling processes, and fully deburr and clean our parts. As a supplier to the aircraft and power generation industries, we have created a niche in machining hard-to-machine material. We machine all of the super alloys, like nickel (Inconel 625 & 718, Waspaloy, Hastelloy-X, A-286 and others), cobalt (L-605,Haynes, and others) and titanium (6AL-4V) alloys. We of course machine a full range of materials from plastic, aluminum, brass/copper alloys and the full range of stainless steels. There is nothing like the sound of Stellite being cut. True Position Manufacturing produces great quality results because we have invested in great quality machine tools. All of our CNC machines are either Mori Seiki or Mazaks. This commitment to quality has served us and our customers well. Please give us a try if you are seeking a top tier supplier that will make your quality control manager happy and your bottom line larger.


15. Euromar

  • Website: euromar.biz
  • Headquarters: Wolcott, Connecticut, United States
  • Headcount: 1-10

In order to track the opportunities and face the challenges arising in these three sectors, EUROMAR has established strategic alliances with a selected group of complementary specialized international consultancy, service and engineering companies to assist in developing corporate decision making and strategic business management. EUROMAR activities revolve around the promotion and marketing of industrial products and services in the Arabian Gulf; primarily in the Upstream Oil/Gas reservoir engineering/field development & associated upstream infrastructure design, Downstream and Petrochemical Process Optimization, Power Generation and Distribution, Marine, Fleet & Port Services as well as other supporting products and services in Business Management, HSE, EPC, PMC and O & M Services. EUROMAR's core competencies and activities cover a wide range of complex business development disciplines and we specialize in the provision of a range of inter-related business consultancy and engineering services including strategic development/growth strategies and associated business plans, business turnaround & change management, organizational development & procedures, market penetration, partner identification & due diligence, risk assessment & management, claims dispute resolution, project pursuit & capture, project management, operational/project auditing, technology transfer assessment & development, human resources and management coaching, technical training, professional/technical manpower secondment, logistical support & commercial performance monitoring services. Home | Euromar Center


16. M.I.S. Commodities

  • Website: miscommodities.com
  • Headquarters: Stamford, Connecticut, United States
  • Headcount: 1-10

MIS Commodities is an international marketer of food and agricultural services. We are a vital link between farmers and consumers. With a veteran team we specialize in soft commodities, meats, and pulses. With principal offices in Bach, Geneva, and Stamford, CT we continue to expand globally in an effort to contribute significantly in the worldwide endeavors towards improving the quality of life.


17. Waste Technologies LLC (WTL)

Waste Technologies LLC is a USA-based company specializing in solid waste management. They offer patented Green Technologies that reduce greenhouse gas emissions by converting municipal solid waste (MSW) to fuel, gas, and fertilizer (FGF). Their mission is to provide a zero waste disposal system while ensuring an economically viable outcome. They are constantly growing and working complacently all over the world.


18. McKenney Mechanical Contractors Inc.

McKenney Mechanical Contractors, Inc is an HVAC, Refrigeration, and Process Piping Contractor that specializes in energy efficiency and reduced emissions. They offer services such as energy cogeneration, variable drive motor upgrades, large-scale dehumidification, and installation of new natural gas services. They have experience in replacing and upgrading complex cooling systems including cooling towers, pumps, and heat exchangers. The company is committed to safety and has a zero injuries, zero delays policy. They have built strong relationships with the community and are actively involved in local organizations.


19. Howell Energy Consulting

Howell Energy Consulting is a company that operates in the Information Technology and Services industry. It employs 6-10 people and has $1M-$5M of revenue. The company is headquartered in Hartford, Connecticut.


20. East River Energy

East River Energy is a company that offers a variety of energy solutions, including heating oil, propane, and diesel fuel, to residential and commercial customers in the Northeastern United States.


21. Aadvantage Power

With over 25 years of experience in the energy sector, Aadvantage Power is committed to helping our customers regain control over their energy costs. Using a blend of proprietary cost-analysis tools, we will provide our customers with lower energy costs and unparalleled customer service. Energy prices vary constantly due to a wide-span of factors including weather, world events, the economy and seasonal variations. Other factors within your own business may cause large swings in what you pay for energy. We will work with you to provide a personalized solution on how you procure your electricity and natural gas.


22. Paragon Advisors

Paragon Advisors develops solutions to help clients establish successful energy cost management strategies in deregulated energy markets. We provide our clients with a road map to leverage the benefits of procurement options, conservation and load management opportunities and other energy incentive programs. As an energy broker our primary focus is to provide the expertise and resources to help our clients procure the most cost effective competitive generation supply. Electric deregulation presents users with significant opportunities to directly manage and reduce their energy costs. See how Paragon Advisors is helping clients evaluate and choose from the vast array of market opportunities.


Want to find more natural gas companies?


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