California's energy efficiency companies play a crucial role in reducing energy consumption and promoting sustainable practices. This industry includes a variety of businesses, from large corporations to boutique firms, all working to deliver innovative solutions that lower costs for clients. Services can range from energy audits to cutting-edge technologies in HVAC and smart systems. Recent trends show increased interest in energy management software and retrofits, indicating a shift towards integrated approaches. This sector is poised for growth as government incentives drive demand for climate-friendly initiatives and businesses seek ways to enhance efficiency while staying competitive.


This collection showcases 22 notable energy efficiency companies located throughout California. Operating sizes vary widely, from smaller firms with 11 employees to larger organizations employing over 5,000. Each company specializes in unique services, including energy audits, renewable energy solutions, and advanced building management systems. Founded between 1973 and 2019, these companies reveal California's vibrant business environment dedicated to improving sustainability and reducing energy costs. Locations span major hubs such as Oakland, San Francisco, and Irvine, reflecting the state's commitment to environmental responsibility and innovation.


Continue reading to discover the top energy efficiency companies in California.


Top 22 Energy Efficiency Companies Companies in California


1. 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 innovative energy management and facility services. ENGIE Services North America employs advanced technology and intelligent integrations to design, build, and manage high-performing sustainability programs. Their Energy Effective™ approach focuses on generating savings, increasing productivity, and promoting sustainability, which has positively impacted numerous clients over the years. The company has a track record of successful projects, demonstrating their capability in delivering effective energy management solutions.


2. Gridium

  • Website: gridium.com
  • Ownership type: Venture Capital
  • Headquarters: Menlo Park, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: Other (Debt), $10.0M, February 2023
  • Founded year: 2011
  • Headcount: 11-50
  • LinkedIn: gridium

Gridium, founded in 2011 and based in Menlo Park, California, is an energy management company that provides innovative solutions aimed at optimizing energy usage for real estate stakeholders. The company offers services such as Energy-Management-as-a-Service and Zero-CapEx Retrofits, which focus on analytics and consulting to improve building performance. Their clientele includes property managers and sustainability leaders who are keen on enhancing operational efficiency and ensuring compliance with energy regulations. Gridium has recently secured $10 million in funding in February 2023, reflecting its active role and relevance in the energy efficiency industry. The company’s approach combines data-driven insights with practical solutions, enabling clients to achieve significant energy cost reductions and streamline reporting processes.


3. FCI Management

  • Website: fcimgt.com
  • Ownership type: Private
  • Headquarters: Cerritos, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1998
  • Headcount: 51-200
  • LinkedIn: fci-management-consultants-fci-

FCI Management, founded in 1998 and based in Cerritos, California, is a private energy solutions provider dedicated to enhancing energy efficiency and promoting clean energy technologies. The company offers a comprehensive suite of services, including utility energy efficiency programs, building code compliance, and energy assessments for both commercial and residential clients. Their expertise extends to various sectors, such as municipalities, schools, and hospitals, where they implement strategies to lower energy costs and reduce carbon footprints. FCI Management is also involved in providing decarbonization strategies and upgrades, showcasing their commitment to sustainable practices and environmental stewardship. With a team of skilled professionals, FCI Management aims to deliver innovative solutions that contribute to the development of sustainable communities.


4. Veregy, formerly Enpowered Solutions


Veregy, formerly known as Enpowered Solutions, is an energy services company based in Irvine, California, founded in 2013. The company focuses on providing innovative solutions for decarbonization and energy efficiency. Their services range from construction management to the implementation of renewable energy systems and smart building technologies. Veregy caters to a variety of sectors, including healthcare, education, and government, helping clients reduce energy costs and transition to sustainable practices. The firm is recognized for its performance contracting approach, which allows clients to fund energy improvements through the savings generated by those improvements. This model is particularly beneficial for organizations facing budget constraints. With a workforce of 501-1000 employees, Veregy has established itself as a significant player in the energy efficiency sector, actively contributing to projects that aim to lower energy consumption and promote sustainability.


5. Comfort International Inc.

  • Website: comfortintl.com
  • Ownership type: Private
  • Headquarters: San Jose, California, United States (USA)
  • Employee distribution: United States (USA) 76%, India 24%
  • Founded year: 1989
  • Headcount: 11-50
  • LinkedIn: comfort-international-inc.

Comfort International Inc., based in San Jose, California, has been operational since 1989, focusing on energy efficiency solutions primarily in HVAC systems and energy management. The company employs a team of experienced engineers and skilled HVAC technicians to provide comprehensive services that include energy management studies, HVAC maintenance, and sustainability solutions. Their approach is centered on helping commercial clients reduce energy consumption and costs while achieving certifications such as Energy Star and LEED. Comfort International is known for its commitment to guaranteed energy savings, often promising a return on investment within two years. Their client portfolio includes various commercial entities, and they have successfully implemented projects that resulted in substantial energy savings, such as optimizing HVAC systems for TDK and achieving net-zero carbon status for the Rosicrucian Museum. The company operates without reported funding, indicating a self-sustaining business model.


6. Energy Solutions

  • Website: energy-solution.com
  • Ownership type: Corporate
  • Headquarters: Oakland, California, United States (USA)
  • Employee distribution: United States (USA) 93%, Other 7%
  • Latest funding: February 2015
  • Founded year: 1995
  • Headcount: 201-500
  • LinkedIn: energy-solutions

Energy Solutions, based in Oakland, California, is a consulting firm that specializes in energy efficiency and sustainability. Established in 1995, the company has built a reputation for its comprehensive approach to energy management. They offer a variety of services, including building decarbonization, demand management, and the design of energy efficiency programs. With a workforce of approximately 709 employees, Energy Solutions has implemented over 100 programs across 22 states, making significant contributions to energy savings and greenhouse gas reductions. Their expertise extends to navigating regulatory requirements and advocating for effective energy policies. The company is also involved in market transformation efforts, helping clients adopt clean technologies and improve energy performance. Their commitment to creating substantial environmental impacts through cost-effective solutions positions them as a key player in the energy efficiency sector.


7. BuildingOS

  • Website: buildingos.com
  • Ownership type: Private
  • Headquarters: Oakland, California, United States (USA)
  • Founded year: 2004
  • Headcount: 51-200
  • LinkedIn: buildingos

BuildingOS, also known as Atrius, is a technology solutions provider based in Oakland, California, founded in 2004. The company specializes in building performance, energy management, and sustainability reporting. Atrius offers a suite of products designed to assist businesses across various sectors, including retail, corporate, and aviation, in optimizing their energy usage and enhancing operational efficiency. Their software solutions automate processes and provide actionable insights, enabling organizations to make informed decisions regarding energy consumption and sustainability practices. Atrius has received recognition for its innovative technology and commitment to sustainability, winning multiple awards in recent years. The company operates as part of the Intelligent Spaces Group at Acuity Brands, which further emphasizes its focus on integrating technology with energy efficiency and sustainability initiatives.


8. Delta Electronics Americas

  • Website: delta-americas.com
  • Ownership type: Private
  • Headquarters: Fremont, California, United States (USA)
  • Employee distribution: United States (USA) 91%, Taiwan 2%, Other 6%
  • Founded year: 1982
  • Headcount: 201-500
  • LinkedIn: delta-electronics-americas

Delta Electronics Americas, based in Fremont, California, is a private technology company founded in 1982. It specializes in energy-efficient solutions and automation, catering primarily to businesses in sectors such as manufacturing and telecommunications. The company offers a wide array of products and services, including industrial automation, building automation, renewable energy solutions, and EV charging systems. Delta's commitment to energy efficiency is evident in its recognition as an ENERGY STAR® Partner of the Year for several consecutive years. This accolade underscores their role in promoting sustainable practices and reducing energy consumption across various industries. Delta's innovative approach and extensive product range position it as a significant player in the energy efficiency sector.


9. Matrix Energy Services, Inc

  • Website: matrixescorp.com
  • Ownership type: Private
  • Headquarters: Sacramento, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2006
  • Headcount: 51-200
  • LinkedIn: matrix-energy-services-inc

Matrix Energy Services, Inc. is a private company based in Sacramento, California, specializing in energy efficiency solutions for businesses. Since its inception in 2006, the company has focused on helping small and medium enterprises reduce energy costs and improve sustainability. They offer a range of services, including energy audits, direct installations of energy-saving measures, and consulting on energy efficiency programs. Matrix Energy Services has built strong relationships with utility companies, allowing them to provide funded energy efficiency programs across multiple states. Their team consists of certified electricians, engineers, and environmental professionals, all dedicated to delivering effective energy solutions. The company has successfully completed numerous projects, resulting in substantial energy savings and reduced carbon footprints for their clients.


10. Harvest

  • Website: harvest-thermal.com
  • Ownership type: Venture Capital
  • Headquarters: Kensington, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: Other (Grant), $2.0M, September 2024
  • Founded year: 2019
  • Headcount: 11-50
  • LinkedIn: harvest-thermal

Harvest, founded in 2019 and based in Kensington, California, is an HVAC company that specializes in energy-efficient heating and cooling solutions. The company has developed innovative products like the Smart Thermal Battery and advanced heat pumps, which are designed to lower energy costs and reduce emissions for both homeowners and businesses. Harvest's technology allows users to optimize their energy consumption while enhancing comfort in their living and working spaces. The company has received $2 million in funding, reflecting investor confidence in its potential to impact the energy efficiency market. Harvest's commitment to sustainability and efficiency is evident in its mission to transform home heating and cooling, making it a notable player in the energy efficiency sector.


11. Emily Grene

  • Website: emilygrene.com
  • Ownership type: Private
  • Headquarters: San Dimas, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2012
  • Headcount: 51-200
  • LinkedIn: emilygrene

Emily Grene, founded in 2012 and based in San Dimas, California, is an engineering firm that specializes in innovative design solutions across several sectors, including energy, security, HVAC, and construction. The company serves a wide range of clients, from residential builders to commercial and industrial enterprises. Emily Grene is dedicated to enhancing safety, comfort, and efficiency in the environments they work in. Their focus on sustainability is evident in their mission to help customers build a more sustainable future through energy-efficient solutions. They offer a variety of services that optimize performance and reduce energy consumption, making them a significant player in the energy efficiency industry. The firm operates with a strong commitment to customer satisfaction and environmental stewardship, aiming to provide clean energy solutions that deliver economic benefits while minimizing environmental impact.


12. QuEST

  • Website: quest-world.com
  • Ownership type: Private
  • Headquarters: Berkeley, California, United States (USA)
  • Employee distribution: United States (USA) 66%, India 34%
  • Founded year: 2001
  • Headcount: 11-50
  • LinkedIn: quest_5

Quantum Energy Services & Technologies, Inc. (QuEST) is a consulting firm based in Berkeley, California, founded in 2001. The company specializes in energy efficiency and management, providing a range of services designed to help businesses and organizations reduce energy costs while improving sustainability. QuEST conducts energy audits, develops energy efficiency projects, and implements wireless energy management systems. Their clientele includes a variety of sectors, such as education, technology, and public utilities, showcasing their ability to cater to different needs. With a team of engineers and project managers, QuEST combines technical expertise with practical solutions, ensuring that clients achieve measurable energy savings. The firm has established strong connections within the California energy field, including partnerships with major utilities and local governments. Their commitment to sustainability is evident in their approach, which emphasizes data-driven diagnostics and ongoing performance verification to ensure that energy efficiency measures deliver lasting results.


13. kW Engineering

  • Website: kw-engineering.com
  • Ownership type: Private
  • Headquarters: Oakland, California, United States (USA)
  • Employee distribution: United States (USA) 96%, Other 4%
  • Founded year: 1998
  • Headcount: 51-200
  • LinkedIn: kw-engineering

kW Engineering, founded in 1998 and based in Oakland, California, is a consulting firm dedicated to energy efficiency and sustainable building solutions. With a workforce of approximately 105 employees, the company has carved out a niche in the energy management sector. They provide a range of services including electrification and decarbonization, commissioning, utility program support, and smart building solutions. Their expertise lies in optimizing building performance and reducing operational costs while minimizing environmental impact. kW Engineering has worked on various projects, helping clients achieve significant energy savings and carbon reduction goals. Their commitment to customer success and tailored solutions has made them a reliable partner for organizations looking to enhance their sustainability efforts.


14. Carbon Lighthouse

  • Website: carbonlighthouse.com
  • Ownership type: Venture Capital
  • Headquarters: San Francisco, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: Seed, October 2021
  • Founded year: 2010
  • Headcount: 11-50
  • LinkedIn: carbon-lighthouse

Carbon Lighthouse, founded in 2010 and based in San Francisco, specializes in energy efficiency solutions for the commercial real estate sector. The company aims to help building owners reduce operating costs while simultaneously generating additional income through innovative services like SMARTincome and mechanical room rent. Their clientele includes commercial real estate firms and property managers who seek to enhance net operating income and tenant satisfaction. With a focus on creating high-return investments, Carbon Lighthouse has successfully implemented its solutions in over 1,800 buildings across the United States, significantly contributing to carbon reduction efforts. The company has reported substantial client value, with clients experiencing average savings and increased rent opportunities. Their approach combines data-driven insights with practical applications, making them a notable player in the energy efficiency industry.


15. Enlighted

  • Website: enlightedinc.com
  • Ownership type: Corporate
  • Headquarters: Santa Clara, California, United States (USA)
  • Employee distribution: India 53%, United States (USA) 37%, Canada 6%, Other 4%
  • Latest funding: May 2018
  • Founded year: 2009
  • Headcount: 201-500
  • LinkedIn: enlighted-inc

Enlighted, founded in 2009 and based in Santa Clara, California, is a technology solutions provider that specializes in Internet of Things (IoT) systems and software applications aimed at optimizing building operations. With a workforce of around 224 employees, the company serves a variety of sectors, including commercial real estate, education, healthcare, and industrial spaces. Enlighted's offerings include advanced lighting solutions, HVAC integration, and data services that provide insights into occupancy and energy management. Their products are designed to enhance energy efficiency while improving the overall workplace experience. Enlighted has established partnerships with notable organizations and has been recognized for its innovative approach to creating smart, sustainable environments. The company has not reported any recent funding, indicating a stable operational status since its last funding round in 2018.


16. RenewAge Energy Solutions

  • Website: renewage.com
  • Ownership type: Private
  • Headquarters: El Segundo, California, United States (USA)
  • Employee distribution: United States (USA) 88%, Mexico 12%
  • Founded year: 2010
  • Headcount: 11-50
  • LinkedIn: renewage-energy-solutions

RenewAge Energy Solutions, founded in 2010 and based in El Segundo, California, is a private company that specializes in energy, construction, and technology solutions aimed at improving property performance and sustainability. With a team of 16 employees, RenewAge offers a range of services including electric vehicle (EV) charging solutions, design engineering, lighting solutions, energy management systems, and water services. Their approach is centered on helping property owners and managers reduce operational costs while enhancing tenant satisfaction. The company has successfully completed projects for various clients, achieving significant savings and revenue generation. Their commitment to sustainability and efficiency positions them as a relevant player in the energy efficiency sector.


17. Greenlite

  • Website: greenliteusa.com
  • Ownership type: Private
  • Headquarters: Anaheim, California, United States (USA)
  • Employee distribution: Canada 83%, United States (USA) 9%, India 9%
  • Founded year: 1994
  • Headcount: 51-200
  • LinkedIn: greenliteusa

Greenlite Lighting Corporation USA, founded in 1994 and based in Anaheim, California, specializes in energy efficiency and home improvement products. The company offers a comprehensive range of solutions aimed at promoting sustainability and reducing energy costs. Their product lineup includes water conservation tools like aerators and showerheads, HVAC systems, smart home technologies, and LED lighting. Greenlite has established itself as a trusted partner for over 150 utilities across North America, providing energy efficiency products and programs tailored to both businesses and consumers. Their commitment to innovation is evident in their extensive catalog, which features ENERGY STAR certified models and smart home devices designed to enhance energy conservation. As a woman-owned and diversity-owned business, Greenlite also prioritizes inclusion and community engagement in their operations.


18. American Power Solutions, INC


American Power Solutions, INC, based in La Mirada, California, has been operational since 2000. The company specializes in energy efficiency solutions, offering a range of products and services that include heat pump water heaters, electric vehicle (EV) chargers, and solar installations. Their clientele primarily consists of commercial properties and organizations aiming to cut energy costs and enhance sustainability. American Power Solutions conducts comprehensive energy audits to identify savings opportunities and provides customized proposals that detail potential energy reductions and associated utility rebates. Their commitment to quality is reflected in their use of certified products and a responsive customer support team. With a workforce of around 57 employees, the company has maintained a steady presence in the energy efficiency sector for over 20 years, focusing on practical solutions that meet the evolving needs of their clients.


19. EcoGreen Solutions Inc.

  • Website: ecogreen-solutions.com
  • Ownership type: Private
  • Headquarters: Laguna Niguel, California, United States (USA)
  • Employee distribution: United States (USA) 85%, France 8%, India 8%
  • Founded year: 2007
  • Headcount: 11-50
  • LinkedIn: ecogreen-solutions-inc.

EcoGreen Solutions Inc., based in Laguna Niguel, California, is an energy services company founded in 2007. With a workforce of 11-50 employees, the company focuses on energy efficiency upgrades primarily for commercial clients, including businesses and public entities. EcoGreen Solutions offers a range of services such as HVAC improvements, LED lighting retrofits, and solar energy solutions. They are particularly adept at navigating utility programs to provide financing options that often require no upfront costs for their clients. Over the years, EcoGreen has successfully completed numerous projects, helping thousands of companies reduce their energy costs and enhance sustainability. Their client portfolio includes various sectors, from agriculture to education, showcasing their ability to tailor solutions to meet specific needs. The company prides itself on delivering comprehensive energy audits and turnkey services, ensuring that all aspects of energy efficiency upgrades are managed effectively.


20. Verdigris

  • Website: verdigris.co
  • Ownership type: Venture Capital
  • Headquarters: Mountain View, California, United States (USA)
  • Employee distribution: United States (USA) 79%, Taiwan 21%
  • Latest funding: $10.0M, August 2023
  • Founded year: 2012
  • Headcount: 51-200
  • LinkedIn: verdigris

Verdigris Technologies, Inc., founded in 2012 and based in Mountain View, California, is a technology company that specializes in smart building management and energy solutions. The firm offers a range of products, including energy meters and analytics software, aimed at helping businesses in data centers, commercial buildings, and industrial facilities optimize their energy usage. By providing tools for better electrical data management, Verdigris enables organizations to enhance operational efficiency and reduce energy costs. The company has recently secured $10 million in funding, reflecting its active role and relevance in the energy efficiency industry. With a focus on delivering real-time, granular data, Verdigris is positioned to support businesses in achieving their sustainability goals and improving their energy management practices.


21. Syserco, Inc.

  • Website: syserco.com
  • Ownership type: Private
  • Headquarters: Fremont, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1973
  • Headcount: 51-200
  • LinkedIn: syserco

Syserco, Inc., based in Fremont, California, is an energy management company that specializes in optimizing energy usage and enhancing building automation. Established in 1973, Syserco initially supplied and serviced HVAC equipment but transitioned to focus on energy management in the late 1980s. The company provides a range of services, including energy management systems, HVAC solutions, and ongoing support, catering to clients in sectors such as healthcare, education, and commercial real estate. With a team of over 200 energy management professionals, including LEED accredited experts, Syserco has successfully designed, installed, and serviced energy management systems in more than 2,500 sites. Their commitment to customer service and training ensures that clients can maintain energy efficiency long after installation. Syserco's projects include notable buildings like the Salesforce Tower and various educational institutions, showcasing their expertise in large-scale and complex jobs.


22. CoolSys - Refrigeration and HVAC Systems

  • Website: coolsys.com
  • Ownership type: Private Equity
  • Headquarters: Brea, California, United States (USA)
  • Employee distribution: United States (USA) 99%
  • Latest funding: March 2019
  • Founded year: 2015
  • Headcount: 1001-5000
  • LinkedIn: cool-sys

CoolSys - Refrigeration and HVAC Systems, founded in 2015 and based in Brea, California, is a private equity-backed service provider specializing in commercial refrigeration and HVAC solutions. With a workforce of over 873 employees, the company offers a wide range of services, including installation, maintenance, and energy optimization tailored for sectors such as commercial, industrial, and healthcare. CoolSys is dedicated to delivering efficient and sustainable solutions, employing a large team of trained technicians who are equipped to handle various system needs. Their focus on energy solutions includes energy audits, upgrades to low-emission systems, and the implementation of energy management systems, which help clients reduce costs and meet their sustainability goals. CoolSys has established a significant presence in the industry, managing over 32,600 customer locations across the United States, and is recognized for its commitment to optimizing the lifecycle of refrigeration and HVAC systems.



Energy Efficiency Companies Insights: Key Companies in California


CompanyHeadquarterSizeFoundedOwnership
ENGIE Services North AmericaOakland, California, United States (USA)1001-50001981Corporate
GridiumMenlo Park, California, United States (USA)11-502011Venture Capital
FCI ManagementCerritos, California, United States (USA)51-2001998Private
Veregy, formerly Enpowered SolutionsIrvine, California, United States (USA)501-10002013Corporate
Comfort International Inc.San Jose, California, United States (USA)11-501989Private
Energy SolutionsOakland, California, United States (USA)201-5001995Corporate
BuildingOSOakland, California, United States (USA)51-2002004Private
Delta Electronics AmericasFremont, California, United States (USA)201-5001982Private
Matrix Energy Services, IncSacramento, California, United States (USA)51-2002006Private
HarvestKensington, California, United States (USA)11-502019Venture Capital
Emily GreneSan Dimas, California, United States (USA)51-2002012Private
QuESTBerkeley, California, United States (USA)11-502001Private
kW EngineeringOakland, California, United States (USA)51-2001998Private
Carbon LighthouseSan Francisco, California, United States (USA)11-502010Venture Capital
EnlightedSanta Clara, California, United States (USA)201-5002009Corporate
RenewAge Energy SolutionsEl Segundo, California, United States (USA)11-502010Private
GreenliteAnaheim, California, United States (USA)51-2001994Private
American Power Solutions, INCLa Mirada, California, United States (USA)11-502000Private
EcoGreen Solutions Inc.Laguna Niguel, California, United States (USA)11-502007Private
VerdigrisMountain View, California, United States (USA)51-2002012Venture Capital
Syserco, Inc.Fremont, California, United States (USA)51-2001973Private
CoolSys - Refrigeration and HVAC SystemsBrea, California, United States (USA)1001-50002015Private Equity


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