The energy storage industry plays a crucial role in managing the supply and demand of electricity generated from renewable sources. It involves companies that develop technologies to store energy for later use, enhancing grid reliability and efficiency. Firms in this sector range from battery manufacturers to innovative technology creators, offering solutions like lithium-ion batteries, flow batteries, and even novel alternatives like liquid metal batteries. As the world transitions to clean energy, the industry is poised for significant growth, with investments flowing into new technologies aimed at improving storage capacity and sustainability. Energy storage is increasingly vital for a resilient power grid.

The companies listed here represent a mix of sizes, with many located in the United States, alongside notable names from Austria, Germany, and the United Kingdom. While some were established in the early 2000s, others have only recently entered the field. They specialize in various innovative technologies, ranging from flow batteries and lithium-ion solutions to advancements like sodium-ion technology. This blend of expertise highlights the sector's evolution and the increasing importance of energy storage in achieving sustainable energy goals.

Top 21 Energy Storage Companies

1. Convergent Energy and Power

• Website: convergentep.com
• Ownership type: Private Equity
• Headquarters: New York, New York, United States (USA)
• Employee distribution: United States (USA) 97%, Canada 2%, Other 1%
• Latest funding: Other (Debt), $584.5M, January 2025
• Founded year: 2011
• Headcount: 51-200
• LinkedIn: convergent-energy-power

Convergent Energy and Power, based in New York City, specializes in energy storage and renewable energy solutions. Since its inception in 2011, the company has focused on helping industrial facilities, utilities, and project developers reduce electricity costs and enhance sustainability. With over $1 billion invested in energy storage and solar systems across North America, Convergent has developed a robust portfolio that includes more than 800 MW / 1 GWh of energy storage and solar-plus-storage systems. Their services have led to significant savings for clients, with some industrial customers experiencing reductions of up to 40% in their electricity bills. Convergent also plays a vital role as a capital partner for solar and storage developers, further solidifying its position in the clean energy transition. The company’s commitment to sustainability is reflected in its strong ESG performance, rated as low risk in the industry. Their innovative PEAK IQ® technology collects and analyzes vast amounts of data to optimize energy storage operations, showcasing their expertise in the field.

2. CellCube

• Website: cellcube.com
• Ownership type: Corporate
• Headquarters: Wiener Neudorf, Lower Austria, Austria
• Employee distribution: Austria 86%, United States (USA) 14%
• Latest funding: August 2020
• Founded year: 2000
• Headcount: 51-200
• LinkedIn: cellcube

CellCube, based in Wiener Neudorf, Austria, is an energy storage provider that specializes in vanadium flow battery technology. Founded in 2000, the company has developed a range of solutions tailored for industrial, commercial, and utility applications. Their products are designed to offer reliable energy management and storage solutions, emphasizing sustainability and efficiency. CellCube manufactures its systems in Austria and has a significant presence in the United States as well. The company has successfully completed over 140 installations globally, showcasing its technology's effectiveness in various applications. Their focus on long-duration energy storage solutions positions them well in a market that increasingly values sustainability and resilience in energy systems.

3. Form Energy

• Website: formenergy.com
• Ownership type: Private Equity
• Headquarters: Somerville, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: Other (Debt), $50.0M, December 2024
• Founded year: 2017
• Headcount: 501-1000
• LinkedIn: form-energy

Form Energy is an American energy storage technology company based in Somerville, Massachusetts. Established in 2017, the company specializes in the development and manufacturing of iron-air batteries, which are designed to store electricity for extended periods—up to 100 hours. This capability positions their technology as a cost-effective solution for managing the variability of renewable energy sources. Form Energy aims to transform the electric grid by providing reliable, clean energy storage that can support utilities and energy providers. The company has received significant funding, including a recent $405 million investment, which underscores its potential for growth and innovation in the energy storage sector. With operations in multiple states, including California and Pennsylvania, Form Energy is actively engaged in projects that enhance the reliability and sustainability of the electric grid.

4. sonnen GmbH

• Website: sonnen.de
• Ownership type: Corporate
• Headquarters: Wildpoldsried, Bavaria, Germany
• Employee distribution: Germany 93%, Egypt 3%, Other 4%
• Latest funding: February 2019
• Founded year: 2010
• Headcount: 501-1000
• LinkedIn: sonnen-gmbh

Sonnen GmbH, based in Wildpoldsried, Bavaria, Germany, is an energy solutions provider that has carved a niche in the renewable energy and battery storage market since its inception in 2010. The company offers a range of products, including the sonnenBatterie, which enables households and small businesses to manage their energy use effectively. With a workforce of around 611 employees, sonnen serves a customer base that values energy independence and sustainability. Their innovative offerings extend beyond battery storage; they also provide energy tariffs and financing options, making it easier for customers to transition to renewable energy. Notably, sonnen has developed a virtual power plant system that aggregates individual battery systems to optimize energy distribution and support grid stability. This commitment to advancing energy storage technology and promoting renewable energy usage underscores sonnen's significant role in the industry.

5. Primus Power Corporation

• Website: primuspower.com
• Ownership type: Venture Capital
• Headquarters: Hayward, California, United States (USA)
• Employee distribution: United States (USA) 67%, United Kingdom (UK) 17%, Nigeria 17%
• Latest funding: Other (Grant), $4.0M, June 2019
• Founded year: 2009
• Headcount: 51-200
• LinkedIn: primus-power

Primus Power Corporation, based in Hayward, California, is an innovative energy storage solutions provider that focuses on long-duration, fade-free energy storage systems. Established in 2009, the company has developed the EnergyPod 2, a flow battery system that serves various sectors, including industrial, commercial, and utilities. This technology allows customers to manage energy costs effectively and enhance grid stability. Primus Power's systems are designed to operate safely and efficiently, with a lifespan of up to 20 years and no risk of fire, making them suitable for a range of applications. The company has received significant funding, including a $4 million grant in 2019, which supports its mission to enable 100% renewable energy worldwide. With a presence in both the U.S. and Asia, Primus Power is actively shipping its products to customers globally, demonstrating its commitment to advancing energy storage technology.

6. Powin

• Website: powin.com
• Ownership type: Private Equity
• Headquarters: Tualatin, Oregon, United States (USA)
• Employee distribution: United States (USA) 87%, Australia 6%, Spain 5%, Other 3%
• Latest funding: Other (Debt), $200.0M, October 2024
• Founded year: 2010
• Headcount: 501-1000
• LinkedIn: powin-energy

Powin, based in Tualatin, Oregon, is a private equity-backed energy storage provider that specializes in advanced battery energy storage systems and energy management solutions. Since its inception in 2010, Powin has focused on enhancing energy efficiency and supporting the transition to clean energy. The company serves a variety of clients, including project developers, utilities, and independent power producers, offering customized services to meet their unique energy needs. Powin's innovative products, such as the Powin Pod—a high-voltage, liquid-cooled energy storage system—and StackOS, a comprehensive energy management software, are designed to optimize performance and reliability. With over 655 GWh discharged to the grid in the past three years and 11 GWh currently under construction, Powin is actively contributing to the energy storage sector. The company has also secured significant funding, with a recent $200 million investment in October 2024, underscoring its growth potential and relevance in the industry.

7. C&D Technologies

• Website: cdtechno.com
• Ownership type: Private Equity
• Headquarters: Horsham, Pennsylvania, United States (USA)
• Employee distribution: United States (USA) 58%, Mexico 25%, China 3%, Other 14%
• Latest funding: August 2017
• Founded year: 1906
• Headcount: 1001-5000
• LinkedIn: c%26d-technologies

C&D Technologies, based in Horsham, Pennsylvania, is a manufacturer specializing in energy storage solutions and power backup systems. Founded in 1906, the company has built a reputation for producing a wide range of battery products, including flooded lead acid and valve regulated lead acid batteries. These products cater to various industries, such as telecommunications, data centers, and renewable energy. C&D Technologies is committed to providing reliable and sustainable power solutions that support critical infrastructure. Their advanced technologies, such as the C&D Ohmic Ring™ and True Front Access™, enhance the performance and maintenance of their battery systems. The company has a significant presence in the energy sector, having empowered a substantial portion of North America's nuclear power plants. With a workforce of over 1,800 employees, C&D Technologies continues to innovate and adapt to the evolving needs of the energy storage market.

8. Res

• Website: res-group.com
• Ownership type: Venture Capital
• Headquarters: Kings Langley, England, United Kingdom (UK)
• Employee distribution: United States (USA) 23%, United Kingdom (UK) 22%, Spain 16%, Other 39%
• Latest funding: January 2019
• Founded year: 1981
• Headcount: 1001-5000
• LinkedIn: res-group

RES Group, founded in 1981 and headquartered in Kings Langley, England, is a prominent renewable energy company that specializes in the development, construction, and management of clean energy projects. With a workforce of nearly 4,000 employees, RES operates globally, leveraging over 40 years of experience in the industry. The company focuses on various renewable technologies, including wind, solar, energy storage, and green hydrogen. RES is dedicated to providing sustainable energy solutions to businesses and organizations, ensuring that projects not only meet energy needs but also contribute positively to the environment. Their energy storage solutions are designed to enhance the flexibility and reliability of renewable energy systems, making them a crucial component of the clean energy transition.

9. Tesvolt Ag

• Website: tesvolt.com
• Ownership type: Venture Capital
• Headquarters: Wittenberg, Saxony-Anhalt, Germany
• Employee distribution: Germany 100%
• Latest funding: Series B, February 2022
• Founded year: 2014
• Headcount: 201-500
• LinkedIn: tesvolt

Tesvolt AG, based in Wittenberg, Saxony-Anhalt, Germany, is a company that specializes in energy storage and management solutions. Established in 2014, Tesvolt has developed a range of products, including cabinet and container systems for battery storage, as well as advanced energy management systems. Their offerings cater to businesses and organizations aiming to optimize energy consumption and effectively integrate renewable energy sources into their operations. The company has a workforce of approximately 176 employees, all located in Germany, and operates under a venture capital ownership model. Tesvolt's products are utilized in various applications, such as self-consumption optimization, peak shaving, and off-grid energy solutions, showcasing their commitment to enhancing energy efficiency and sustainability. The company has also engaged in funding activities, with their last funding round occurring in February 2022, which reflects their ongoing growth and investment in the energy storage sector.

10. Aquion Energy

• Website: aquionenergy.com
• Ownership type: Corporate
• Headquarters: Pittsburgh, Pennsylvania, United States (USA)
• Latest funding: $9.2M, July 2017
• Founded year: 2008
• Headcount: 51-200
• LinkedIn: aquion-energy

Aquion Energy, established in 2008 and located in Pittsburgh, Pennsylvania, is an energy storage company that focuses on providing innovative battery solutions tailored for homeowners, businesses, and utilities. The company emphasizes sustainability and energy efficiency, aiming to enhance the reliability of energy storage options. Aquion's products are designed to meet the growing demand for effective energy storage in various applications, reflecting their commitment to advancing battery technology. Despite not having secured funding since 2017, Aquion Energy continues to operate and engage with the energy storage market, showcasing their relevance in the industry.

11. Kokam

• Website: kokam.com
• Ownership type: Corporate
• Headquarters: Seongnam-Si, Gyeonggi-Do, South Korea
• Employee distribution: South Korea 100%
• Latest funding: $88.0M, October 2018
• Founded year: 1989
• Headcount: 201-500
• LinkedIn: kokam-co.-ltd.

Kokam, based in Seongnam-Si, Gyeonggi-Do, South Korea, is a company that specializes in lithium-ion battery solutions. Founded in 1989, Kokam has established itself as a significant player in the energy storage industry. The company manufactures a range of products, including battery cells, modules, and complete energy storage systems tailored for utilities and commercial sectors. Kokam's technology is designed to optimize energy use, manage costs, and facilitate the integration of renewable energy sources. Their commitment to innovation is evident in their recent projects, such as the development of large-scale battery systems aimed at reducing reliance on fossil fuels and enhancing energy efficiency. Kokam's strategic partnerships further highlight their role in advancing energy storage solutions globally.

12. Gotion Inc.

• Website: gotion.com
• Ownership type: Private
• Headquarters: Fremont, California, United States (USA)
• Employee distribution: United States (USA) 60%, China 24%, Indonesia 7%, Other 10%
• Founded year: 2014
• Headcount: 51-200
• LinkedIn: gotion-inc-

Gotion Inc., founded in 2014 and headquartered in Fremont, California, is an energy solutions company that specializes in green energy technologies. The firm focuses on energy storage and electric vehicle solutions, catering to businesses in the automotive and energy sectors. Gotion is committed to enhancing sustainability and energy efficiency through innovative products and services. With a workforce distributed globally, including significant operations in the United States, China, and Germany, Gotion is well-positioned to advance green energy initiatives. The company actively engages in the energy storage market, as evidenced by their job postings for roles specifically related to energy storage systems. This involvement underscores their dedication to contributing to the energy transition and supporting the growing demand for energy storage solutions.

13. ViZn Energy Systems

• Website: viznenergy.com
• Ownership type: Venture Capital
• Headquarters: Columbia Falls, Montana, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $15.0M, June 2018
• Founded year: 2009
• Headcount: 11-50
• LinkedIn: vizn-energy-systems

ViZn Energy Systems, founded in 2009 and based in Columbia Falls, Montana, is an energy storage company that focuses on innovative and safe energy storage solutions. The company has developed products like the GS200 and Z20 energy storage systems, which cater to utility, military, and commercial sectors. ViZn's technology utilizes zinc/iron flow batteries, which are designed to be non-toxic, non-flammable, and non-explosive, making them suitable for deployment in populated areas. The company emphasizes a 20-year lifespan for its products, with minimal maintenance requirements and a strong focus on recycling at the end of life. ViZn has attracted $15 million in funding, reflecting confidence in its approach to energy storage. Their mission is to support a renewable energy-powered future, and they aim to modernize the grid while providing reliable energy storage solutions.

14. Faradion Limited

• Website: faradion.co.uk
• Ownership type: Corporate
• Headquarters: Sheffield, England, United Kingdom (UK)
• Employee distribution: United Kingdom (UK) 100%
• Latest funding: $135.3M, December 2021
• Founded year: 2010
• Headcount: 11-50
• LinkedIn: faradion-limited

Faradion Limited, founded in 2011 and based in Sheffield, England, specializes in sodium-ion battery technology. The company aims to revolutionize energy storage solutions by offering safer and more cost-effective alternatives to conventional lithium-ion batteries. Faradion's sodium-ion batteries are designed for a variety of applications, including stationary energy storage and transport solutions, such as electric vehicles and e-bikes. With a focus on high energy density, safety, and sustainability, Faradion has developed a robust intellectual property portfolio, holding numerous patents in the sodium-ion technology space. The company has also engaged with various partners and licensees to manufacture and deploy its battery technology in real-world scenarios. In December 2021, Faradion secured significant funding, amounting to over 135 million, which highlights its active role in the energy storage sector and its potential for growth.

15. Amber Kinetics

• Website: amberkinetics.com
• Ownership type: Venture Capital
• Headquarters: Union, California, United States (USA)
• Employee distribution: Philippines 58%, United States (USA) 35%, Australia 5%, Other 2%
• Latest funding: Seed, October 2014
• Founded year: 2009
• Headcount: 51-200
• LinkedIn: amber-kinetics

Amber Kinetics, Inc. is a California-based company founded in 2009, specializing in energy storage solutions through the development of long-duration flywheel energy storage systems. Their innovative technology allows for energy storage durations extending from minutes to hours, making it suitable for utilities and organizations that require dependable energy storage to support renewable energy sources. The company operates manufacturing facilities in the Philippines and has a global customer base, showcasing their international reach. With over 1.79 GWh discharged to date and more than 1.4 million operational hours logged, Amber Kinetics has demonstrated its capability in the energy storage market. Their commitment to sustainability is evident in their use of non-toxic materials and a design that allows for 95% recyclability at the end of the product's life. Amber Kinetics has also received recognition for its technology, including awards for innovation in alternative storage technology. Their mission focuses on providing emission-free, economical, and safe energy storage solutions, contributing to the development of reliable and sustainable energy infrastructure worldwide.

16. Ambri

• Website: ambri.com
• Ownership type: Venture Capital
• Headquarters: Marlborough, Massachusetts, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $7.4M, August 2024
• Founded year: 2010
• Headcount: 51-200
• LinkedIn: ambri

Ambri, founded in 2010 and based in Marlborough, Massachusetts, is an energy storage company that specializes in long-duration energy storage solutions. The company has developed an innovative Liquid Metal™ battery technology aimed at enhancing energy storage capabilities for utility companies and organizations focused on renewable energy. Ambri's systems are designed to stabilize the grid and provide reliable energy storage for grid-scale applications. The company has made significant strides in the industry, including achieving UL 1973 certification for its next-generation battery cells and securing partnerships for utility deployments, such as with Xcel Energy and Microsoft. Ambri has also expanded its manufacturing capacity and is actively involved in projects that aim to integrate renewable energy sources into the power grid. Recently, Ambri completed a sale and emerged from Chapter 11, indicating a renewed focus on its operations and growth potential. The company has raised over $200 million in funding, showcasing investor confidence in its technology and vision.

17. NorthStar Battery

• Website: northstarbattery.com
• Ownership type: Corporate
• Headquarters: Springfield, Missouri, United States (USA)
• Employee distribution: United States (USA) 91%, Sweden 4%, United Arab Emirates 4%
• Latest funding: September 2019
• Founded year: 2000
• Headcount: 501-1000
• LinkedIn: northstarbatterycompany

NorthStar Battery, a part of EnerSys, is a corporate entity based in Springfield, Missouri, specializing in energy storage solutions. Founded in 2000, the company has established itself in the battery manufacturing industry, focusing on high-performance batteries that serve a variety of sectors, including telecommunications, logistics, and medical. NorthStar Battery is known for its commitment to reliability and efficiency, providing energy storage systems that ensure operational continuity for its clients. The company operates globally, with a significant presence in the United States and additional operations in Sweden and the United Arab Emirates. Their product offerings include advanced battery technologies that are crucial for powering critical applications across different industries.

18. PowerSecure, Inc.

• Website: powersecure.com
• Ownership type: Corporate
• Headquarters: Durham, North Carolina, United States (USA)
• Employee distribution: United States (USA) 100%
• Latest funding: $431.0M, February 2016
• Founded year: 1991
• Headcount: 501-1000
• LinkedIn: powersecure

PowerSecure, Inc., based in Durham, North Carolina, is an energy solutions provider that has been operational since 1991. The company specializes in innovative energy management and efficiency services, offering a range of products that include microgrids and energy storage systems. PowerSecure serves various sectors, including healthcare, government, and manufacturing, focusing on delivering reliable and resilient energy solutions. Their energy storage systems are designed to integrate seamlessly with generators, providing enhanced reliability and cost savings. With a workforce of approximately 811 employees, PowerSecure has developed and managed over 2 GW of microgrid capacity and implemented significant energy efficiency upgrades, totaling over $900 million. As a subsidiary of Southern Company, PowerSecure is positioned to leverage extensive resources and expertise in the energy sector.

19. Maxwell Technologies

• Website: maxwell.com
• Ownership type: Corporate
• Headquarters: San Diego, California, United States (USA)
• Employee distribution: United States (USA) 43%, China 32%, India 7%, Other 18%
• Latest funding: $218.0M, February 2019
• Founded year: 1965
• Headcount: 51-200
• LinkedIn: maxwell-technologies

Maxwell Technologies, based in San Diego, California, is a manufacturer that specializes in energy storage solutions, particularly ultracapacitors. Founded in 1965, the company has carved out a niche in providing products that deliver quick bursts of power and efficient energy storage. Their ultracapacitor technology is utilized across various industries, including automotive, renewable energy, and industrial electronics. Maxwell's products are engineered to meet the rigorous demands of applications such as regenerative braking systems, uninterruptible power supplies, and energy stabilization for renewable installations. The company has a notable global footprint, with a significant portion of its operations in China and India, and has successfully deployed over 65 million ultracapacitor cells worldwide. In 2019, Maxwell Technologies secured $218 million in funding, further solidifying its position in the energy storage market.

20. Highview Power

• Website: highviewpower.com
• Ownership type: Private
• Headquarters: London, England, United Kingdom (UK)
• Employee distribution: United Kingdom (UK) 83%, United Arab Emirates 11%, India 3%, Other 3%
• Founded year: 2005
• Headcount: 51-200
• LinkedIn: highviewpower

Highview Power, founded in 2005 and based in London, specializes in long-duration energy storage solutions through its innovative Liquid Air Energy Storage technology. The company aims to facilitate the transition to renewable energy by providing reliable and consistent energy storage options. Highview Power's technology captures excess energy from renewable sources, allowing for energy to be stored and used when demand peaks or generation dips. This capability is crucial for stabilizing the grid and ensuring a steady energy supply. The company has engaged in significant projects, including partnerships with the National Grid to enhance the UK's energy security and collaborations with Ørsted to optimize wind farm operations. Highview Power is committed to helping businesses and communities achieve net-zero emissions, positioning itself as a key player in the energy storage sector.

21. EnerVenue

• Website: enervenue.com
• Ownership type: Venture Capital
• Headquarters: Fremont, California, United States (USA)
• Employee distribution: United States (USA) 96%, Australia 4%
• Latest funding: Series B, $308.1M, June 2024
• Founded year: 2020
• Headcount: 201-500
• LinkedIn: enervenue

EnerVenue, Inc. is a California-based company founded in 2020, specializing in energy storage solutions through its innovative metal-hydrogen battery technology. The company targets a variety of sectors, including grid operators, commercial and industrial businesses, and residential users. EnerVenue's products are designed to enhance energy reliability and facilitate the integration of renewable energy sources. Their technology boasts a remarkable lifecycle of 30,000 cycles, making it a durable option for long-term energy storage. The company has recently secured significant funding, raising over $308 million in a Series B round, which underscores its potential for growth and development in the energy storage market. EnerVenue's commitment to safety, sustainability, and efficiency positions it as a noteworthy contender in the energy storage industry.

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