Battery storage is crucial to the global transition to renewable energy. It’s how utilities save excess solar and wind power for later use in order to stabilize grids and keep electricity flowing when generation dips, or during more extreme circumstances like blackouts.
But the modern battery energy storage system (BESS) market is no longer just about building batteries. Nowadays, the industry includes companies that are developing next-generation chemistries alongside those that are creating the software, cooling technology and grid infrastructure that allow these massive energy banks to operate reliably at scale. At the same time, falling lithium iron phosphate battery costs are making these projects cheaper to build as the energy-intensive AI race dashes on.
Below are some of the biggest names influencing the future of battery storage and the broader energy grid.
Top Battery Storage Companies
- CATL
- Tesla Energy
- Fluence
- BYD
- EVE Energy
Top Battery Storage Companies
Headquarters: Yongin-si, South Korea
Founded: 1970
Company size: 25k+ employees
What they do: Samsung SDI has become a brand to trust in battery storage, thanks to its prismatic cells that prioritize thermal stability and a 20-year service life. Its Samsung Battery Box systems and U8A1 prismatic batteries help set the industry standard for AI data centers and mission-critical backup power where fire prevention and long-term reliability are paramount.
Headquarters: Juno Beach, Florida
Founded: 1984
Company size: 14k+ employees
What they do: Clean energy developer NextEra Energy Resources’ portfolio spans more than 40,000 megawatts of total generating capacity across wind, solar and battery storage. As part of NextEra Energy family, whose Florida Power & Light subsidiary is the largest utility in the country and serves 12 million people in the Sunshine State, the company has the utility relationships and project scale to make solar-plus-storage a blueprint for modern grid infrastructure.
Headquarters: Huizhou, China
Founded: 2001
Company size: 25k - 30k employees
What they do: EVE Energy has rapidly evolved from a battery supplier into one of the biggest names in stationary energy storage. Its supersized lithium-iron-phosphate cell designs make it a legitimate competitor to energy giant CATL in utility-scale projects. Its Mr. Big product line, including a 6.9MWh battery energy storage system in a standard 20-foot container, is an example of the company’s wider push for larger, cheaper grid infrastructure.
Headquarters: Ningde, China
Founded: 2011
Company size: 100k+ employees
What they do: CATL is the world’s largest battery maker. Owning 40 percent of the global EV battery market, it supplies the lithium-ion systems powering everything from electric vehicles to utility-scale renewable energy projects. The company’s influence increasingly comes from its ability to dictate battery chemistry trends — particularly around lithium iron phosphate and sodium-ion storage — both of which are becoming more important for lower-cost grid storage.
Headquarters: Zurich, Switzerland
Founded: 2020
Company size: 50k+ employees
What they do: Hitachi Energy builds the grid infrastructure that helps large battery storage systems plug into modern power networks. The company has worked on utility-scale storage and transmission projects across Europe, Asia and North America, delivering power to more than three billion people. Using tools like e-mesh, Lumada and digital substations, Hitachi synchronizes electricity between utilities and renewable generation sites, as well as grid-scale batteries.
Headquarters: Shenzhen, China
Founded: 1995
Company size: 1m+ employees
What they do: BYD controls one of the most vertically integrated battery supply chains, stretching from raw materials to finished storage systems and electric vehicles. That leverage gives the company room to price aggressively while scaling lithium iron phosphate products like its own MC Cube-T for both residential and utility-scale storage, ultimately accelerating the global adoption of lower-cost battery systems.
Headquarters: Austin, Texas
Founded: 2003
Company size: 100k+ employees
What they do: Tesla Energy catapulted battery storage into a mainstream piece of grid infrastructure through its Megapack systems, which are now deployed at massive utility scale across the United States, Europe and Australia. Additionally, its Autobidder software has pushed the company deeper into energy trading by automatically deciding when stored electricity should be released back into the grid based on demand.
Headquarters: Seoul, South Korea
Founded: 2020
Company size: 30k+ employees
What they do: LG Energy Solution remains one of the most influential non-Chinese battery manufacturers in the global storage market, particularly across North America. Its recent switch to lithium-iron-phosphate chemistry reflects a broader industry tilt toward lower-cost batteries that can safely support long-duration grid storage. To date, the company holds more than 25,000 battery-related patents.
Headquarters: Hefei, China
Founded: 1997
Company size: 15k+ employees
What they do: Sungrow expanded into battery storage after building a major foothold in the global photovoltaic inverter market, where it holds roughly 30 percent share and has surpassed 500 GW in cumulative shipments. That scale gives the company an edge in grid-forming storage projects, as its power conversion systems, liquid-cooled PowerTitan batteries and iSolarCloud software help move renewable energy onto the grid.
Headquarters: Arlington, Virginia
Founded: 2018
Company size: 1k - 5k employees
What they do: Backed by Siemens and AES, Fluence has emerged as one of the world’s most influential battery storage integrators despite not manufacturing its own cells. Instead, the company connects batteries from multiple suppliers with software like cloud-based asset management system Nispera and auto-bidding software Mosaic. Those tools help utilities forecast performance, optimize revenue and keep large-scale storage projects in line with grid demand.
