Energy efficiency companies focus on minimizing energy consumption and reducing carbon footprints across various sectors. Their methods include retrofitting buildings, optimizing systems, and implementing renewable energy solutions. As global energy demands rise, this industry is gaining traction, driven by increasing regulatory frameworks and a push for sustainability. Innovations such as smart technologies and data analytics are transforming how energy efficiency is approached. Moreover, the industry is expected to see a shift towards integrating more advanced and automated solutions, enhancing capabilities to provide even smarter and more efficient energy management systems.

The listed companies vary in size from 11 to over 12,500 employees, showcasing operations mainly in the USA, Canada, and Europe. Founded between 1942 and 2020, they specialize in services like energy management, HVAC solutions, and building optimization. Many are privately owned, indicating a trend of independence and innovation within the sector. Notable names include McKinstry, which has pioneered sustainable building operations, and Ecosystem, recognized for its commitment to integrated energy solutions.

Continue reading to discover the best energy efficiency companies.

Top 23 Energy Efficiency Companies

1. McKinstry

• Website: mckinstry.com
• Ownership type: Venture Capital
• Headquarters: Seattle, Washington, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Seed, $534,000, April 2015
• Founded year: 1960
• Headcount: 1001-5000
• LinkedIn: mckinstry

McKinstry is a construction services company based in Seattle, Washington, founded in 1960. With a workforce of over 2,000 employees, the company specializes in building operations, energy management, and sustainable solutions. McKinstry provides a comprehensive range of services aimed at helping businesses and organizations enhance their energy efficiency and effectively manage their facilities. Their offerings include energy services that focus on replacing outdated components to achieve measurable utility savings, as well as facility condition assessments that help prioritize capital planning. The company is also involved in solar and renewable energy projects, contributing to the transition towards a more sustainable built environment. McKinstry's commitment to innovation and sustainability positions it as a key player in transforming how buildings operate and consume energy.

2. Ecosystem

• Website: ecosystem-energy.com
• Ownership type: Private
• Headquarters: Canada
• Employee distribution: Canada 68%, United States (USA) 32%
• Founded year: 1993
• Headcount: 201-500
• LinkedIn: ecosystem

Ecosystem is a Canadian energy services company that specializes in engineering and construction solutions aimed at improving energy efficiency and sustainability. Established in 1993, the company has developed a robust portfolio of projects across various sectors, including healthcare, education, and municipal authorities. With a workforce of approximately 309 employees, Ecosystem operates primarily in Canada and the United States, providing customized energy performance projects that help clients achieve their decarbonization goals. The company prides itself on its integrated approach, combining engineering, design, construction, and commissioning to deliver measurable results. Ecosystem has successfully completed numerous projects, resulting in significant energy savings and greenhouse gas reductions. Their commitment to innovation and accountability is evident in their ability to guarantee energy savings for clients, further solidifying their role in the energy efficiency industry.

3. Viessmann Refrigeration Systems

• Website: viessmann.com
• Ownership type: Private
• Headquarters: Porvoo, Uusimaa, Finland
• Founded year: 1917
• Headcount: 501-1000
• LinkedIn: norpe

Viessmann Refrigeration Systems, part of the Viessmann Generations Group GmbH & Co. KG, is a climate solutions provider based in Porvoo, Uusimaa, Finland. Founded in 1917, the company has a long-standing history in the industry, focusing on innovative products and services that aim to reduce CO₂ emissions and improve energy efficiency. Viessmann operates on a global scale, emphasizing sustainability in all aspects of its operations. Their offerings include advanced refrigeration systems designed to meet the needs of various sectors, ensuring that both businesses and consumers can benefit from energy-efficient solutions. The company is committed to co-creating living spaces for future generations, reflecting its dedication to environmental stewardship and energy conservation.

4. ENGIE Solutions France

• Website: engie-solutions.com
• Ownership type: Corporate
• Headquarters: Courbevoie, Île-De-France, France
• Employee distribution: France 97%, Other 3%
• Latest funding: June 2021
• Founded year: 2020
• Headcount: 10001+
• LinkedIn: engie-solutions

ENGIE Solutions France, established in 2020, operates as a corporate entity based in Courbevoie, Île-De-France. With over 12,500 employees, the company specializes in providing energy solutions that prioritize energy efficiency and renewable energy services. ENGIE Solutions assists various sectors, including local communities, industries, and businesses, in minimizing energy consumption and transitioning to sustainable energy sources. Their services include energy audits, maintenance, and the implementation of energy-efficient technologies. The company is dedicated to decarbonization efforts, helping clients reduce their carbon footprints while optimizing energy use. ENGIE Solutions is a subsidiary of the ENGIE Group, which further strengthens its capabilities and resources in the energy sector. The company has made significant strides in promoting energy efficiency across France, with a focus on innovative solutions that meet the evolving energy needs of its clients.

5. Energy Systems Group (ESG)

• Website: energysystemsgroup.com
• Ownership type: Private Equity
• Headquarters: Newburgh, Indiana, United States (USA)
• Employee distribution: United States (USA) 98%, Other 2%
• Latest funding: July 2023
• Founded year: 1994
• Headcount: 201-500
• LinkedIn: energy-systems-group

Energy Systems Group (ESG), founded in 1994 and based in Newburgh, Indiana, is a private equity-backed energy service company. With a workforce of approximately 390 employees, ESG specializes in delivering energy efficiency, sustainability, and electrification solutions tailored to various sectors, including healthcare, education, and government. The company focuses on reducing energy costs and enhancing operational efficiency through innovative infrastructure improvements and consulting services. ESG's portfolio includes a wide range of services such as water conservation, building automation, retrocommissioning, and HVAC optimization. They have successfully implemented projects that have saved over 4.8 million megawatt hours of energy, equating to significant reductions in carbon emissions and fossil fuel consumption. ESG operates across multiple states, leveraging a team of experts to provide customized solutions that meet the unique needs of their clients. Their commitment to community engagement and safety further underscores their role as a responsible player in the energy efficiency industry.

6. Enova by Veolia

• Website: enova-me.com
• Ownership type: Private
• Headquarters: Dubai, Dubai, United Arab Emirates (UAE)
• Employee distribution: United Arab Emirates 63%, Saudi Arabia 23%, Egypt 6%, Other 7%
• Founded year: 2002
• Headcount: 5001-10000
• LinkedIn: enova-me

Enova by Veolia, established in 2002, operates out of Dubai, UAE, and is a private company with a workforce of over 4,400 employees. The firm specializes in integrated energy and facilities management solutions, catering to various sectors such as transportation, retail, healthcare, and more. Enova's core mission is to help businesses optimize their energy consumption while enhancing operational efficiency. They offer a range of services, including energy management, facility management, and sustainable solutions. The company has made notable strides in sustainability, reporting impressive figures such as 611 million kWh in electricity savings and a reduction of 470,000 tons of CO2 emissions. Enova's commitment to innovation is reflected in their use of advanced technologies and digital solutions to improve energy performance. Their recognition as the first ESCO accredited company in Dubai further solidifies their position in the energy efficiency industry.

7. ENGIE Services North America

• Website: engieservices.us
• Ownership type: Corporate
• Headquarters: Oakland, California, United States (USA)
• Latest funding: October 2018
• Founded year: 1981
• Headcount: 1001-5000
• LinkedIn: engie-services-na

ENGIE Services North America, based in Oakland, California, is an energy services company that has been operational since 1981. The firm specializes in providing sustainable energy solutions and efficiency programs tailored for businesses and organizations across commercial, industrial, education, and government sectors. Their services aim to help clients reduce energy costs and enhance operational efficiency through advanced energy management and facility services. ENGIE Services North America is known for its Energy Effective™ programs, which focus on generating savings, increasing productivity, and promoting sustainability. The company has successfully partnered with various clients, including educational institutions and government entities, to implement energy-efficient practices and technologies. Their approach integrates continuous monitoring and data analytics to optimize energy performance and drive impactful results.

8. Hoval

• Website: hoval.com
• Ownership type: Private
• Headquarters: Vaduz, Vaduz, Liechtenstein
• Employee distribution: Liechtenstein 69%, Switzerland 9%, Austria 4%, Other 18%
• Founded year: 1945
• Headcount: 1001-5000
• LinkedIn: hoval-aktiengesellschaft

Hoval Aktiengesellschaft, founded in 1945 and based in Vaduz, Liechtenstein, is a manufacturer specializing in heating, ventilation, and air conditioning (HVAC) systems. The company is dedicated to improving indoor climate control while prioritizing energy efficiency and sustainability. Hoval's product range includes gas and oil heating systems, heat pumps, solar energy solutions, and advanced indoor climate systems. They serve a variety of sectors, including residential homes, hotels, offices, schools, hospitals, and data centers. Hoval's approach involves providing tailored solutions that meet specific climate control needs, ensuring optimal energy use and reduced carbon footprints. Their commitment to innovation is evident in their focus on developing products that minimize energy consumption and emissions throughout their lifecycle. Hoval operates primarily in Europe, with a significant presence in Liechtenstein, Switzerland, and Austria, and continues to expand its influence in the HVAC industry.

9. Energy Management Collaborative (EMC)

• Website: emcllc.com
• Ownership type: Corporate
• Headquarters: Minneapolis, Minnesota, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: August 2019
• Founded year: 2003
• Headcount: 201-500
• LinkedIn: energy-management-collaborative-emc-llc

Energy Management Collaborative (EMC) is an energy management company based in Minneapolis, Minnesota, founded in 2003. With a workforce of approximately 193 employees, EMC specializes in providing energy-efficient lighting and technology solutions tailored for various sectors, including retail, commercial, industrial, and healthcare. Their service portfolio includes LED lighting installations, disinfection technologies, and HVAC energy savings, all aimed at enhancing energy efficiency and sustainability for their clients. EMC operates on a model that emphasizes measurable energy savings, with a goal to save customers 25 billion kWh by 2025. They also offer innovative funding solutions like Efficiency as a Service (EaaS), which allows businesses to implement energy efficiency projects without upfront costs. This approach not only facilitates immediate energy savings but also supports long-term sustainability goals. EMC's commitment to improving indoor air quality and safety through advanced disinfection technologies further underscores their relevance in the energy efficiency sector.

10. Energy Optimizers, USA

• Website: energyoptusa.com
• Ownership type: Family Owned
• Headquarters: Dayton, Ohio, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 2009
• Headcount: 11-50
• LinkedIn: energy-optimizers-usa

Energy Optimizers, USA, based in Dayton, Ohio, is a family-owned company that specializes in energy efficiency solutions. Founded in 2009, the firm has carved out a niche in providing comprehensive energy-saving services to educational institutions, local governments, and commercial clients. Their offerings include energy audits, LED lighting retrofits, HVAC renovations, and renewable energy projects. The company emphasizes a vendor-neutral approach, ensuring that clients receive the best possible solutions tailored to their specific needs. With a strong focus on reducing operational costs and improving energy efficiency, Energy Optimizers, USA has successfully implemented numerous projects, contributing to significant energy savings and environmental benefits. Their commitment to ethics and customer service is evident in their long-standing relationships with clients, many of whom have engaged them for multiple projects over the years.

11. Ecosave

• Website: ecosaveinc.com
• Ownership type: Private
• Headquarters: Philadelphia, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 97%, Australia 3%
• Founded year: 2002
• Headcount: 51-200
• LinkedIn: ecosave-inc

Ecosave is an energy solutions company based in Philadelphia, Pennsylvania, specializing in energy efficiency and renewable energy services. Established in 2002, Ecosave has built a reputation for providing tailored solutions that help businesses and organizations reduce energy costs and meet sustainability objectives. The company operates under an innovative Energy-as-a-Service model, which allows clients to undertake energy-saving projects without the burden of upfront capital costs. Instead, projects are funded through the savings generated, making it financially viable for clients to invest in energy efficiency. Ecosave's offerings include energy efficiency services that can reduce utility costs by 25-60%, smart building automation systems that optimize efficiency without sacrificing comfort, and renewable energy generation options such as solar and geothermal. The company has successfully implemented projects across various sectors, including commercial real estate and healthcare, and has completed over 3,700 projects to date. Ecosave's proprietary emissions monitoring software, EcosaveWatch, further enhances their service by providing insights into building efficiency and energy savings. With a dedicated team and a commitment to sustainability, Ecosave continues to play a significant role in advancing energy efficiency initiatives.

12. Bmsi

• Website: bmsi.co.uk
• Ownership type: Corporate
• Headquarters: Maidenhead, England, United Kingdom (UK)
• Employee distribution: United Kingdom (UK) 99%, Other 1%
• Latest funding: $10.0M, October 2008
• Founded year: 1999
• Headcount: 201-500
• LinkedIn: bmsi

Bmsi, based in Maidenhead, England, is a corporate entity founded in 1999. The company specializes in building energy management systems (BEMS), providing tailored project installations and energy support services to businesses across the UK. With a workforce of over 300 employees, Bmsi emphasizes innovation and customer satisfaction in its operations. They assist clients in optimizing energy consumption, which is essential for achieving sustainability goals. Bmsi's proprietary technology platform, MEDIC, allows for real-time monitoring and management of energy usage, enhancing their service offerings. The company has also committed to becoming net zero by 2026, reflecting its dedication to environmental responsibility.

13. Cx Associates

• Website: cx-associates.com
• Ownership type: Private
• Headquarters: Burlington, Vermont, United States (USA)
• Employee distribution: United States (USA) 100%
• Founded year: 1994
• Headcount: 11-50
• LinkedIn: cx-associates

Cx Associates is an energy consulting firm based in Burlington, Vermont, founded in 1994. The company specializes in enhancing building efficiency and minimizing energy consumption through a comprehensive suite of services. These include design reviews, energy management, and efficiency programs tailored for various sectors such as commercial businesses, educational institutions, and healthcare facilities. Cx Associates is committed to addressing climate change by providing innovative engineering solutions that not only save energy but also reduce operational costs for their clients. Their team of professionals brings extensive experience in commissioning and energy management, ensuring that buildings operate optimally. The firm has built a reputation for delivering measurable results, helping clients achieve their energy reduction goals while navigating the complexities of modern building requirements. Cx Associates operates with a mission-driven approach, focusing on sustainability and the long-term impact of their work on both people and the planet.

14. Bouygues Energies & Services (CH)

• Website: bouygues-es.ch
• Ownership type: Family Owned
• Headquarters: Zurich, Zurich, Switzerland
• Founded year: 2018
• Headcount: 5001-10000
• LinkedIn: bouygues-energies-services-intec

Bouygues Energies & Services (CH), now operating under the brand Equans Switzerland, is a service provider based in Zurich, Switzerland. Founded in 2018, the company has quickly established itself in the fields of building technology, energy optimization, and facility management. With a workforce of approximately 5,000 employees, Bouygues Energies & Services focuses on delivering integrated solutions that enhance operational efficiency for businesses and organizations. Their expertise spans various sectors, including energy and infrastructure management, where they aim to improve sustainability and reduce energy consumption. The company emphasizes innovation and customer service, ensuring that their solutions are tailored to meet the specific needs of their clients. Their services include energy optimization consulting, smart building solutions, and comprehensive facility management, all designed to promote energy efficiency and support the transition to renewable energy sources.

15. CLEAResult

• Website: clearesult.com
• Ownership type: Private Equity
• Headquarters: Austin, Texas, United States (USA)
• Employee distribution: United States (USA) 83%, Canada 17%
• Latest funding: September 2024
• Founded year: 2003
• Headcount: 1001-5000
• LinkedIn: clearesult

CLEAResult, based in Austin, Texas, is a private equity-owned company that specializes in energy efficiency and sustainability services. Founded in 2003, it has grown to employ over 2,200 individuals, primarily in the United States and Canada. The company provides a comprehensive suite of solutions designed to assist utilities, businesses, and residential customers in reducing energy consumption and transitioning to sustainable practices. Their offerings include consulting, training, and certification programs, as well as innovative products like the CLEAResult ATLAS™ platform, which simplifies eligibility verification for incentive programs and tracks greenhouse gas emissions. CLEAResult has made a significant impact in the industry, having helped avert 133 million metric tons of CO2 emissions since its founding, demonstrating their commitment to fostering a more sustainable energy future.

16. Enerz

• Website: enerz.fi
• Ownership type: Private
• Headquarters: Espoo, Uusimaa, Finland
• Employee distribution: Finland 83%, Latvia 13%, Sweden 4%
• Founded year: 2018
• Headcount: 51-200
• LinkedIn: enerz-oy

Enerz, established in 2018 and based in Espoo, Finland, is a private company dedicated to providing energy efficiency solutions and consulting services. With a workforce of approximately 54 employees, Enerz operates primarily in Finland, Latvia, and Sweden. The company assists property owners and managers in implementing energy-efficient systems, aiming to help clients achieve their sustainability goals while reducing operational costs. Enerz's services include comprehensive energy management, energy efficiency projects, and expert consulting, ensuring that clients receive tailored solutions that meet their specific needs. The company has successfully completed numerous projects, resulting in significant CO2 emissions reductions, showcasing their commitment to environmental responsibility. Enerz's vision is to support the transition to net-zero buildings, making them a relevant player in the energy efficiency sector.

17. Rexel Energy Solutions USA

• Website: rexelenergy.com
• Ownership type: Family Owned
• Headquarters: Taunton, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 97%, Indonesia 3%
• Founded year: 1942
• Headcount: 51-200
• LinkedIn: rexel-energy-solutions-usa

Rexel Energy Solutions USA, based in Taunton, Massachusetts, is a family-owned energy solutions provider that has been operational since 1942. The company specializes in energy optimization and electrification, offering a range of products and services aimed at enhancing energy efficiency for businesses, particularly in the energy sector. Their portfolio includes advanced lighting systems, electric vehicle (EV) charging stations, HVAC solutions, solar photovoltaic systems, and battery storage options. Rexel Energy Solutions is dedicated to helping clients meet their sustainability goals through customized solutions and comprehensive support. They also provide valuable resources such as rebate analysis, energy savings calculations, and project management services, which are essential for navigating the complexities of energy efficiency projects. With a workforce of around 72 employees, the company maintains a significant presence in the U.S. market, with a small operational footprint in Indonesia.

18. Indoor Energy

• Website: indoor.se
• Ownership type: Private
• Headquarters: Solna, Stockholm, Sweden
• Employee distribution: Sweden 100%
• Founded year: 1990
• Headcount: 201-500
• LinkedIn: indoor-energy

Indoor Energy, based in Solna, Stockholm, Sweden, is a private service provider established in 1990. The company specializes in energy efficiency and building management, offering a wide range of services that include heating, cooling, ventilation, and energy optimization. With a workforce of approximately 300 employees, Indoor Energy operates across Sweden, focusing on helping property owners and managers reduce energy consumption and improve indoor climate conditions. Their expertise allows them to serve over 10,000 properties, providing tailored solutions that address the specific energy needs of each building. Indoor Energy is committed to sustainability, aiming to lower energy costs for clients by up to 40%. They also engage in educational efforts, offering training programs to enhance knowledge about energy management among property managers. This holistic approach positions Indoor Energy as a significant contributor to energy efficiency in the built environment.

19. Cenergistic

• Website: cenergistic.com
• Ownership type: Venture Capital
• Headquarters: Dallas, Texas, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: November 2015
• Founded year: 1986
• Headcount: 201-500
• LinkedIn: cenergistic

Cenergistic, based in Dallas, Texas, is an energy conservation company that specializes in optimizing energy use for various organizations, particularly school districts and local governments. Established in 1986, the company has dedicated itself to helping clients reduce energy costs and improve sustainability through a range of services, including energy management software and consulting. Cenergistic's business model is designed to deliver measurable savings without requiring upfront capital investment, making it an attractive option for clients with budget constraints. The company has managed over $28 billion in energy billings and has achieved an average savings of 24% on expected energy costs for its clients. With a focus on creating healthier buildings and optimizing existing equipment, Cenergistic aims to instill a culture of sustainability within organizations. Their innovative solutions have led to significant energy savings and have earned them numerous accolades, including the 2024 ENERGY STAR Partner of the Year — Sustained Excellence Award. Cenergistic's commitment to energy efficiency is evident in their extensive experience and the positive impact they have made across more than 25,500 buildings.

20. GridPoint

• Website: gridpoint.com
• Ownership type: Venture Capital
• Headquarters: Reston, Virginia, United States (USA)
• Employee distribution: United States (USA) 99%, Other 1%
• Latest funding: $45.0M, March 2025
• Founded year: 2003
• Headcount: 201-500
• LinkedIn: gridpoint

GridPoint, founded in 2003 and based in Reston, Virginia, is an energy management company that focuses on innovative solutions for energy efficiency and sustainability. The firm serves a range of clients, including enterprises and government agencies, particularly in the clean technology sector. GridPoint's offerings include building management systems and energy analytics, which are designed to help customers identify inefficiencies and optimize their energy usage. The company has reported substantial achievements, including over $1 billion in energy savings, 13 billion pounds of CO2 emissions avoided, and 7.5 billion kWh of energy reduced. Recently, GridPoint secured $45 million in funding, indicating ongoing investor confidence in their business model and technology. Their platform integrates various building systems, providing real-time visibility and automated controls that enhance operational efficiency and support sustainability initiatives.

21. Sealed

• Website: sealed.com
• Ownership type: Private Equity
• Headquarters: New York, New York, United States (USA)
• Employee distribution: United States (USA) 84%, India 5%, Australia 5%, Other 5%
• Latest funding: Series B, $30.0M, March 2024
• Founded year: 2012
• Headcount: 51-200
• LinkedIn: sealed

Sealed is a climate tech company based in New York, founded in 2012, that specializes in home energy efficiency and electrification. The company aims to combat energy waste in residential settings by offering services such as insulation and HVAC upgrades. Sealed collaborates with contractors to facilitate these upgrades, ensuring that homeowners can benefit from available rebates and incentives. Their innovative software and analytics support contractors in maximizing their earnings while simplifying the rebate process. Sealed has been recognized as the first Energy Star Home Upgrade Service Provider, highlighting their commitment to high-performance energy solutions. With a workforce of around 58 employees and a recent Series B funding round of $30 million in March 2024, Sealed is positioned for continued growth and impact in the energy efficiency market.

22. SEE-Tech Solutions Pvt. Ltd.

• Website: seetechsolutions.in
• Ownership type: Private
• Headquarters: Nagpur, Maharashtra, India
• Employee distribution: India 100%
• Founded year: 1993
• Headcount: 11-50
• LinkedIn: see-tech-solutions-pvt-ltd-

SEE-Tech Solutions Pvt. Ltd., based in Nagpur, Maharashtra, India, is an energy service company that has been active in the field of energy efficiency and conservation since its inception in 1993. With a dedicated team of over 30 consultants and engineers, the company focuses on delivering energy-saving solutions tailored to the needs of various sectors, including small and medium enterprises, hotels, and large industries. SEE-Tech specializes in conducting energy audits and implementing energy-saving technologies, aiming to achieve substantial reductions in energy costs for its clients. The firm has successfully executed more than 2000 projects, resulting in significant energy savings and cost reductions. Their commitment to sustainability is reflected in their mission to help clients achieve net-zero carbon emissions. SEE-Tech is recognized as a Grade-1 ESCO by the Bureau of Energy Efficiency, highlighting their expertise and reliability in the energy efficiency domain.

23. Techem Energy Services GmbH

• Website: techem.com
• Ownership type: Private Equity
• Headquarters: Eschborn, Hesse, Germany
• Employee distribution: Germany 80%, Poland 4%, Italy 4%, Other 12%
• Latest funding: $7.5B, September 2024
• Founded year: 1952
• Headcount: 1001-5000
• LinkedIn: techem-ag

Techem Energy Services GmbH, based in Eschborn, Hesse, Germany, is an energy and metering service provider that has been active since 1952. The company focuses on creating smart digital solutions tailored for the real estate industry, helping clients optimize energy consumption and reduce operational costs. Techem offers a comprehensive suite of services, including billing, energy efficiency solutions, and device management. With approximately 60 million devices installed worldwide, they provide transparent data on energy and water consumption, which is vital for informed decision-making. Techem is also committed to sustainability, aiming for a climate-neutral building stock by 2045. Their innovative approach includes advanced technologies for monitoring and optimizing heating systems, as well as smart metering solutions that facilitate the energy transition. Techem operates in 18 countries, demonstrating its international reach and influence in the energy efficiency sector.

Energy Efficiency Insights: Key Companies

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