California's energy sector is actively shifting towards clean, renewable, and efficient energy resources. Various energy efficiency companies are emerging into prominence as they strive to deliver sustainable power technologies. These companies offer innovative solutions varying from solar energy generation to turnkey efficiency upgrades. Residential and commercial customers alike are beneficiaries of services like solar panel installation, financing, maintenance, and energy savings. With California's need for energy efficiency in mind, an increasing number of businesses are dedicated to reducing energy wastage and seeking viable sustainable power methods. As we advance, the industry seems poised for continued growth and innovation.


Top 22 energy efficiency companies in California

1. Sunrun

  • Website: sunrun.com
  • Headquarters: San Francisco, California, United States
  • Founded: 2007
  • Headcount: 10001+
  • Latest funding type: Post Ipo Debt
  • LinkedIn

Sunrun is a solar company that offers solar energy solutions to residential customers. They have provided solar to over 550,000 customers nationwide, saving them over $600 million on their utility bills.


2. SolarCity

  • Website: solarcity.com
  • Headquarters: San Mateo, California, United States
  • Founded: 2006
  • Headcount: 10001+
  • LinkedIn

SolarCity offers solar energy solutions to residential and commercial customers, providing clean and sustainable power. Their services include installation, financing, and maintenance of solar panels.


3. Freedom Forever

Freedom Forever is a solar panel installation company that offers customized solar energy systems for residential customers. They guarantee the amount of energy that their systems produce for 25 years, making them the best in the industry. The company aims to provide freedom from high electric bills and help customers become more energy efficient.


4. Sungevity

  • Website: sungevity.com
  • Headquarters: Oakland, California, United States
  • Founded: 2007
  • Headcount: 501-1000
  • Latest funding type: Post Ipo Debt
  • LinkedIn

Sungevity is a leading residential solar power company in California. They offer customized solar energy systems with battery storage options, providing savings and financing solutions. Their solar systems are designed to adapt to customers' changing needs and come with a guarantee of performance for 25 years. Sungevity also offers a solar lease program where they own, install, and maintain the solar system. With an easy-to-use monitoring app, customers can track their solar energy system in real-time.


5. Neon Energy

Neon Energy is a company that specializes in providing energy solutions and services. They offer a range of products and technologies to help businesses and individuals optimize their energy usage and reduce environmental impact.


6. H&S Energy Products, LLC

HNS Energy Products is a company that offers a variety of energy products and solutions. They provide efficient and sustainable solutions for both residential and commercial customers.


7. Sunworks, Inc.

  • Website: sunworksusa.com
  • Headquarters: Roseville, California, United States
  • Founded: 1983
  • Headcount: 201-500
  • Latest funding type: Private Equity
  • LinkedIn

Sunworks is a company that provides industry-leading commercial solar power solutions. They specialize in offering solar energy solutions for agricultural, commercial, industrial, public works, and residential sectors. Sunworks aims to help businesses reduce their electric bills, protect against fluctuating energy prices, and enhance their ESG programs.


8. Talesun Solar USA Ltd.

  • Website: talesunusa.com
  • Headquarters: San Jose, California, United States
  • Founded: 2009
  • Headcount: 1001-5000
  • LinkedIn

Talesun USA LLC is a company that specializes in producing solar panels and wind turbines for commercial and residential use.


9. Apricot Solar

Apricot Solar is a company that offers solar energy solutions for residential and commercial properties. They provide a range of products and services, including solar panel installation, maintenance, and financing options.


10. Partner Energy

  • Website: ptrenergy.com
  • Headquarters: Los Angeles, California, United States
  • Founded: 2009
  • Headcount: 51-200
  • LinkedIn

Partner Energy is a nationwide provider of energy efficiency engineering, sustainability, and ESG+R consulting services for existing buildings, new construction, and adaptive reuse.


11. SunPro Solar

SunPro Solar is a company that specializes in residential and commercial solar solutions. With a focus on providing durable and weather-resistant solar panels, they help homeowners and businesses save on electricity costs and shield themselves against future rate increases. They offer services such as solar panel installation, cleaning, and battery storage.


12. Gei

Green Energy Innovations is a company that provides energy-efficient solutions for businesses. They specialize in new LED installations, stadium lighting, and tankless water systems, helping businesses save money and reduce energy consumption.


13. WECS Renewables

WECS Renewables is a leading company in the renewable energy sector, dedicated to developing innovative and sustainable solutions. They offer a wide range of products and services in the field of renewable energy, including wind turbines, solar panels, and energy management systems.


14. Moxion Power Co.

  • Website: moxionpower.com
  • Headquarters: Richmond, California, United States
  • Founded: 2020
  • Headcount: 11-50
  • Latest funding type: Series B
  • LinkedIn

Moxion Power is a company that offers innovative power solutions for businesses. They provide a range of products and services to help companies optimize their energy usage and reduce costs.


15. Power Efficiency Corporation

Power Efficiency is a company focused on promoting and implementing energy-efficient solutions for homes and businesses. They offer a range of products and services aimed at reducing energy consumption and helping customers save money while minimizing their environmental impact. With a strong emphasis on sustainability and green technology, Power Efficiency strives to be a leading player in the energy efficiency industry.


16. Solar Energy Partners

Solar Energy Partners (solarenergy.partners) is a company that specializes in providing solar energy solutions. They offer services such as switching to solar energy and becoming part of their team. Contact them for more information.


17. ConnectPV, Inc.

  • Website: connectpv.com
  • Headquarters: San Diego, California, United States
  • Founded: 2015
  • Headcount: 11-50
  • LinkedIn

ConnectPV is a company that offers solar energy solutions and services. They provide a range of products and expertise to help customers harness the power of solar energy for their homes or businesses.


18. Sustineo Solar

  • Website: sustineo.solar
  • Headquarters: San Diego, California, United States
  • Founded: 2007
  • Headcount: 11-50
  • LinkedIn

Sustineo is a company specializing in Design-Build project delivery for clients in the solar and energy storage industry. They offer a holistic approach, from initial concept to final sign-off, providing less stress and faster project completion. Their in-house staff of electricians and engineers troubleshoot, analyze, and protect investments. They also offer solar preventative maintenance, carport projects, and commercial & industrial solar construction. Sustineo aims to simplify the pursuit of sustainability and exceed customer expectations.


19. Option One Solar

Option One Solar is a leading solar energy company based in Southern California. We specialize in residential and commercial solar installations, offering high-quality solar panels and battery storage solutions. With thousands of successful solar installations and a commitment to excellence, we are the #1 choice for solar energy in the region.


20. Ivy Energy

  • Website: ivy.energy
  • Headquarters: San Diego, California, United States
  • Founded: 2018
  • Headcount: 11-50
  • LinkedIn

Ivy Energy is a company that offers innovative solutions in the energy sector. They provide sustainable energy solutions and technologies to businesses and individuals, helping them reduce their carbon footprint and save on energy costs.


21. Davis Energy Group, a division of Frontier Energy, Inc.

Davis Energy offers a range of services and solutions. They focus on providing energy efficiency consulting, sustainable building design, and implementation of energy-saving technologies.


22. Synergy Power

Synergy Power is a solar power company that specializes in the design, installation, and maintenance of solar panels. They offer high-quality solar panels and provide excellent customer service throughout the entire process.


Want to find more energy efficiency companies?


If you want to find more companies that offer stellar solar energy technologies and energy-saving solutions 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!