Energy storage projects have a design life of 10 to 20 years, and their actual performance is determined by far more than just a spec sheet.
It depends on whether the system's safety architecture is robust, whether the battery cell supply is stable and reliable, whether the BMS, EMS, and PCS are sufficiently integrated, and whether the battery energy storage system manufacturer will still be providing warranty service to you several years down the line.
This guide is designed to help you make these assessments.
We will systematically review ten leading global battery energy storage system suppliers-including CoPow Energy, Tesla Energy, Fluence Energy, Sungrow, CATL, BYD, LG Energy Solution, EVE Energy, Huawei Digital Power, and HiTHIUM-and compare them side-by-side based on production capacity, cell quality, BMS/EMS/PCS integration capabilities, safety standards, international certifications, and actual project track records.
Whether you are a utility company, project developer, EPC contractor, system integrator, or a business planning its first energy storage investment, this guide will help you distinguish between reliable and high-risk manufacturers, ensuring your project gets off to a solid start from the very beginning.
Quick Comparison of the Top 10 BESS Manufacturers in 2026
| Brand | Founded | Core Differentiator |
|---|---|---|
| CoPow Energy | 2011 | Full-stack ESS customization & integration |
| Tesla Energy | 2015 | Software-driven energy storage ecosystem |
| Fluence Energy | 2018 | Utility-scale ESS & AI optimization |
| Sungrow | 1997 | Solar + storage & PCS integration |
| CATL | 2011 | Large-scale battery cell manufacturing |
| BYD | 1995 | Vertically integrated Blade Battery ecosystem |
| LG Energy Solution | 2020 | North American localized battery supply |
| EVE Energy | 2001 | Large-capacity ESS cell technology |
| Huawei Digital Power | 2021 | Grid-forming + digital power technology |
| HiTHIUM | 2019 | Long-duration energy storage specialization |
* Next, we'll introduce each company one by one, starting with CoPow.
CoPow Energy - Full-Stack Energy Storage System Manufacturer
Founded in 2011 and headquartered at Wanda Jie Industrial Park on Jinlong Avenue in Pingshan District, Shenzhen, CoPow is a professional lithium-ion battery manufacturer. For more than a decade, CoPow has focused on the research and development, production, sales, and service of lithium iron phosphate batteries, guided by the brand philosophy of "Safer, Smarter."
Currently, our business footprint spans more than 40 countries, including the United States, the United Kingdom, Germany, Australia, Canada, Colombia, and Kenya. We are introducing international production, service, and supply standards to the global energy storage market and are committed to becoming a key player in the global energy storage sector.
CoPow is underpinned by its deep technical expertise and professional team.
CoPow's founding team and core R&D personnel come from CATL, BYD, and OptimumNano, bringing an average of over 20 years of extensive experience in the development of energy storage and power batteries.
The company has assembled a team of more than 50 high-caliber professionals, over half of whom hold master's or doctoral degrees. The company has established independent R&D capabilities, with business scope covering cell and pack structural design, battery management systems, modular energy storage power conversion systems, and energy management systems, demonstrating strong system integration capabilities.
In terms of our technology strategy, we adopt a combined hardware-software approach. On the hardware side, our portfolio includes PCS, EMS, BMS, temperature control systems, high-safety new materials, thermal management, next-generation semiconductors, semi-solid-state switches for backup power, and integrated controllers.
On the software side, our offerings include a digital energy management platform, a comprehensive energy management system for power plants, a power market trading system, a smart power plant operations and maintenance management system, and the SAV AI agent, extending into areas such as AI-powered operations and maintenance, AI-powered trading, AI-powered diagnostics, AI-powered reporting, and voice interaction.
CoPow's unique advantages include: dual-engine air-liquid intelligent cooling technology, stacked photovoltaic-storage technology, "flash-switching" technology capable of intelligent voltage capture and instantaneous seamless switching, and AI full-cycle balancing technology.
On the manufacturing and delivery front, we have established a global production footprint with manufacturing bases in multiple countries overseas. By the end of 2025, we will be able to meet a production capacity demand of 5 GWh.
Our production lines are fully equipped, covering fully automated SMT lines, PACK lines, system assembly lines, automated sheet metal lines, automated painting lines, and the entire process of system assembly and testing.
Combined with the MES system's end-to-end monitoring and zero-defect management system, this ensures stable and controllable production with full traceability of information, thereby guaranteeing product quality and safety throughout the manufacturing process.
Manufacturer Strength & Project Scale: PACK, BMS, PCS, EMS, 50+ R&D personnel, over 50% holding master's or doctoral degrees, automated production, 5 GWh production capacity, system integration, and large-scale delivery.
Battery Cell Brands & Performancel: The system uses LFP battery cells, with primary capacities of 314 Ah and 587 Ah, supports 100% DOD, and has a maximum system cycle efficiency of 92.9%.
Cost & ROI: System cycle efficiency improves by 0.8%–2.0%, and the integration of solar and storage further increases efficiency by 0.5%–1.5%, resulting in approximately $44,700 in additional revenue over the full lifecycle of a 1 MWh project.
Safety: LFP battery cells-Active safety alerts-Multi-level fire protection-Intelligent thermal management. The large-scale energy storage system is equipped with perfluorohexane, water-based fire suppression, explosion-proof fans, and an aerosol fire suppression system.
BMS / EMS / PCS Integration Capabilities: Independently developed and integrated with BMS, EMS, and a modular PCS, it supports intelligent control, optimization of charging and discharging strategies, and system-level energy management.
System Customization & Compatibility: Featuring a modular design, it offers flexible deployment, on-demand scalability, and the ability to connect multiple units in parallel, making it compatible with a variety of application scenarios, including grid-connected and off-grid systems, photovoltaic-storage-charging systems, and backup power solutions.
Application Scenario Adaptability: It covers applications such as commercial and industrial energy storage, solar-storage-charging systems, backup power, virtual power plants (VPPs), heavy industry, long-duration energy storage, and large-scale generation-side and grid-side energy storage.
Warranty & Full Lifecycle Support: We provide 24/7 service, with a response time of no more than 30 minutes, an equipment uptime rate of 99.9%, and a mean time to repair of no more than 1.5 days.
International Certifications: UL 9540, UL 9540A, UL 1973, UL 1741, IEC 62619, IEC 62933-5-2, IEC 62477-1, CE, UN38.3, NFPA 855, RoHS, EMC, etc.
Contact Information
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Tesla Energy - Software-Driven Energy Storage Solutions Leader
Tesla Energy is a core division of Tesla focused on power generation and energy storage; it is not a separately registered third-party company. Its history dates back to 2006, when Elon Musk proposed a vision of "transitioning from a hydrocarbon-based economy to a solar and electric economy."
In 2015, Tesla Energy officially launched its full lineup of energy storage products. Subsequently, Tesla Energy acquired SolarCity, a residential solar company, for $2.6 billion, thereby completing the integration of the entire industry chain-from solar power generation to energy storage and dispatch.
Tesla Energy's product portfolio covers energy storage needs across all scenarios-residential, commercial and industrial, and utility-scale. Its core products include the wall-mounted Powerwall battery for residential users, the Powerpack for small and medium-sized commercial and industrial applications, and the containerized Megapack for utility-scale, ultra-large-scale energy storage.
A single Megapack can store over 3.9 MWh of electricity, equivalent to the battery capacity of 62 Tesla Model 3 vehicles. Currently, this product has been deployed in more than 65 countries worldwide, with over 1,500 operational sites and a cumulative installed capacity exceeding 10 GWh.
To meet rapidly growing market demand, Tesla has built two energy storage Gigafactories-one in California, USA, and another in Shanghai, China. Among these, the energy storage factory in Lingang, Shanghai, officially began production in February 2025 and is Tesla's first energy storage production base outside the United States. The factory has a planned annual production capacity of 10,000 Megapacks, corresponding to a total energy storage capacity of nearly 40 gigawatt-hours. Since production began, the products have been rapidly exported to multiple countries in regions such as Europe and Oceania.
In addition to hardware products, Tesla Energy has developed an AI-driven energy trading and dispatch platform centered on Autobidder, which enables real-time bidding for energy storage assets and optimizes smart charging and discharging. At the same time, Tesla Energy operates virtual power plant businesses in multiple locations worldwide.
The most representative example is the project in California, USA. During a grid heatwave stress test in September 2025, this project mobilized more than 140,000 distributed residential energy storage units, delivering 580 megawatts of power within three hours. This was equivalent to temporarily establishing a medium-sized peaking power plant, which not only prevented grid blackouts but also earned participating households a high compensation of $2 per kilowatt-hour, transforming the idle energy storage resources of ordinary households into flexible regulation assets for the grid.
In the future, Tesla Energy's revenue is expected to match or even exceed that of its automotive business. Currently, Tesla Energy is rapidly expanding into the AI data center energy storage sector and has deployed a total of nearly 1.2 gigawatt-hours of Megapack energy storage systems for Musk's xAI Colossus supercomputing data center in Memphis. At the same time, Tesla Energy has secured a large, long-term energy storage order from Alphabet, Google's parent company, creating a virtuous cycle in which "the company refines its energy storage technology by leveraging its own AI computing needs and then delivers mature products and services to AI customers worldwide," further solidifying its competitive advantage in the global large-scale energy storage sector.
Manufacturer Capabilities & Project Scale: Global energy storage deployment exceeds 46.7 GWh per year. The combined annual production capacity of our factories in Shanghai and the United States totals 80 GWh, covering all scenarios-from utility-scale to commercial, industrial, and residential-and enabling the delivery of gigawatt-hour-scale, interconnected energy storage projects.
BMS / EMS / PCS Integration Capabilities: The in-house developed BMS provides end-to-end monitoring and control of cell status; the Megapack features a built-in 1.5 MW PCS; and the EMS is equipped with the Autobidder AI dispatch system, supporting millisecond-level response times and coordination with virtual power plant clusters.
Safety: Featuring a liquid-cooling system combined with a seven-layer in-chamber fire protection system and a design with no exposed high-pressure components, the entire system has passed major safety certifications such as UL 9540A, and the thermal runaway incident rate at sites worldwide is significantly lower than the industry average.
Fluence Energy - Utility-Scale Energy Storage Integration Expert
Fluence Energy is a leading global provider of energy storage products, services, and renewable energy optimization software, headquartered in Arlington, Virginia. The company was established in 2018 as a joint venture between Siemens and AES Corporation and went public on the Nasdaq on October 28, 2021, under the ticker symbol FLNC. It is referred to by the market as "the first pure-play energy storage stock."
Its technological roots trace back to two joint ventures-AES Energy Storage and Siemens' energy storage division. Since its founding in 2007, the Fluence Energy team has been operational and has tested the world's first lithium-ion energy storage system. Shortly after its founding, the company secured an order for a 100-megawatt/400-megawatt-hour lithium-ion battery energy storage project in Long Beach, California, serving Southern California Edison and the western Los Angeles area.
As a global leader in utility-scale energy storage integration, Fluence Energy operates in 47 markets worldwide and has consistently ranked among the top three in the North American energy storage integration market. In 2023, its market share was approximately 15%, with a customer base that includes utilities, renewable energy developers, and large enterprises. Additionally, in 2026, the company secured its first major data center orders, setting new records for both new orders and its order backlog.
Fluence Energy has built a comprehensive product portfolio covering a wide range of applications. Its core hardware includes: Smartstack™, a high-density modular energy storage platform launched in 2026 based on 314Ah cells with a single-unit capacity of 7.5 MWh; Gridstack Pro™ for grid-scale and industrial applications; Gridstack™ for grid operators and power developers; and Ultrastack™, designed to address grid stability and congestion issues in transmission networks.
All hardware products are equipped with Fluence OS, an energy management system developed in-house. On the software side, the Fluence IQ platform includes AI-based SaaS applications such as Fluence Nispera and Fluence Mosaic, which enable the unified management and optimization of renewable energy and energy storage assets from different suppliers. This "software-defined energy storage" model gives the company significant control over its supply chain and avoids reliance on a single battery cell supplier.
In September 2026, Fluence Energy signed a long-term lithium-ion battery supply framework agreement with EVE Energy for a total capacity of 206 GWh from 2027 to 2031. This agreement is one of the largest single battery supply agreements in the history of the global energy storage industry.
Manufacturer Capabilities & Project Scale: Global cumulative energy storage capacity deployed or contracted exceeds 80 GWh, with a backlog of orders totaling 45.6 GW / 163.7 GWh-Annual production capacity at the U.S.-based automated manufacturing facility reaches 35 GWh-Completed Europe's largest single-site energy storage project at 1 GW / 4 GWh-Business operations span nearly 50 markets worldwide.
BMS / EMS / PCS Integration Capabilities: Our in-house developed, full-stack Fluence OS energy management system deeply integrates the BMS, EMS, and PCS. Leveraging Siemens' expertise in electrical engineering, it supports and manages hardware from multiple brands. Combined with the Fluence IQ AI platform, it enables intelligent optimization across assets.
Safety: This product complies with thermal runaway propagation test standards that are more stringent than UL 9540A and has undergone extreme operating condition validation in collaboration with DNV. In addition, it features a 24/7 remote monitoring and early warning system and incorporates multiple layers of safety redundancy mechanisms into its design from the outset.
Sungrow - Solar-Plus-Storage Solutions Leader
Sungrow Power Supply Co., Ltd. (Sungrow) was founded in 1997 by university professor Cao Renxian. Headquartered in Hefei, Anhui, it is a global leader in new energy technology. The company was listed on the Shenzhen Stock Exchange in 2011 under stock code 300274. Sungrow has been deeply involved in the clean energy sector for nearly 30 years, with operations spanning more than 180 countries and regions worldwide.
As a world-leading manufacturer of energy storage systems, Sungrow has deeply integrated "three-electricity technologies"-power electronics, electrochemistry, and grid support-to create specialized energy storage solutions.
As of December 2025, its cumulative global installed capacity of energy storage systems ranked first worldwide. In 2025, the company's global shipments of energy storage systems reached 43 GWh. Additionally, the company was ranked No. 1 in the global energy storage systems market by S&P Global and ranked No. 1 in the global energy storage systems and PCS financeability rankings by BloombergNEF. Meanwhile, the total cumulative installed capacity of the company's photovoltaic inverters and converters worldwide has exceeded 1,000 GW, making it the globally recognized supplier of energy storage and photovoltaic equipment with the highest financial reliability.
The company boasts outstanding R&D capabilities, with R&D personnel accounting for 40% of its workforce. It operates six major R&D centers and in-house testing facilities certified by international authorities such as SGS. The company has undertaken more than 20 national key science and technology projects, led the formulation of numerous national industry standards, and established over 520 service centers worldwide.
In addition, the company has established overseas manufacturing facilities and regional R&D centers in India, Europe, and other locations. In 2024, the company achieved operating revenue of 77.857 billion yuan and net profit of 11.036 billion yuan.
The company's business scope has expanded from energy storage and photovoltaics to multiple clean energy sectors, including wind power converters, hydrogen energy equipment, and electric vehicle control systems, and it continues to provide comprehensive clean power solutions for customers worldwide.
Manufacturer Capabilities & Project Scale: In 2025, global shipments of energy storage systems reached 43 GWh, and the company ranked first globally in cumulative installed capacity. Revenue from the energy storage business reached 37.287 billion yuan. Globally, 7.8 GWh of grid-connected flagship projects were successfully implemented, with business operations spanning more than 180 countries and regions.
BMS / EMS / PCS Integration Capabilities: All three core components were developed in-house from the ground up. Based on a "three-electricity integration" architecture, the company has successfully achieved deep coupling between software and hardware. The in-house PCS has an efficiency exceeding 98.5% and supports high compatibility with battery cells from different brands, reducing the grid connection time for a 1 GWh project to just 12 days.
Safety: The company was the first in the industry to complete large-scale real-device combustion testing and released a comprehensive security white paper. Equipped with an AI-powered thermal runaway early warning system, it can provide risk alerts up to one hour in advance. It offers closed-loop protection across all levels and throughout the entire lifecycle, ensuring zero security incidents involving the network.
CATL
Contemporary Amperex Technology Co., Ltd. (CATL), a world-leading innovative technology company in the new energy sector headquartered in Ningde, Fujian, was officially established in 2011. It listed on the ChiNext board of the Shenzhen Stock Exchange in 2018 and went public on the Hong Kong Stock Exchange in 2025, achieving an A+H share structure.
CATL has ranked first globally in power battery usage for nine consecutive years and has also ranked first globally in energy storage battery shipments for five consecutive years.
In the first half of 2026, CATL's energy storage cell shipments reached 125 GWh, accounting for a 27.1% global market share. Revenue from the energy storage business totaled 53.261 billion yuan, representing a year-over-year increase of 87.54%, and has become the company's second growth engine, second only to power batteries.
CATL has established 20 battery manufacturing bases worldwide, among which three factories in Ningde, Yibin, and Liyang have been designated as "Lighthouse Factories" by the World Economic Forum. The company achieved carbon neutrality in its core operations in 2025 and maintains a research and development team of over 20,000 people.
In 2024, CATL's R&D investment reached 18.6 billion yuan, with a cumulative total of nearly 50,000 domestic and international patent applications. Its 21C Innovation Lab is a world-leading R&D center for cutting-edge energy storage technologies.
As the undisputed global leader in the energy storage sector, CATL has launched a full range of products, including the EnerC containerized liquid-cooling system, the Tianheng energy storage system, and the 587Ah high-capacity energy storage cell.
In June 2026, the company officially unveiled its first sodium-ion battery energy storage system and began deliveries in September. In addition, the company has secured the world's largest sodium-ion battery order, totaling 60 GWh.
Its products cover all application scenarios-including generation-side, grid-side, commercial and industrial, and residential-and have been successfully deployed in Europe's largest grid-side energy storage plant in Mendi, UK, as well as a 220 MWh liquid-cooled energy storage flagship project in Texas, USA. The company has also established in-depth strategic partnerships with key domestic power groups such as China National Nuclear Power and China Huadian.
At the same time, leveraging its independently developed Tianheng·Zhichu digital management platform, the company provides global customers with one-stop electrochemical energy storage solutions covering battery cells, systems, and intelligent operation and maintenance, and has successfully established a complete closed-loop system for battery materials-spanning production, use, and recycling.
Manufacturer Capabilities & Project Scale: The company has ranked first globally in energy storage battery shipments for five consecutive years; in the first half of 2026, its energy storage cell shipments reached 125 GWh, accounting for a 27.1% global market share. With 20 manufacturing facilities worldwide, the company has successfully implemented Europe's largest single energy storage project, and its cumulative delivery volume ranks among the highest in the industry.
BMS / EMS / PCS Integration Capabilities: Our proprietary all-scenario BMS and Tianheng Zhichu EMS platform support efficient coordination with PCS units from leading brands, providing end-to-end integration of battery cells, systems, and grid dispatch to meet all-scenario requirements on both the generation side and the grid side.
Safety: The company has launched the NP3.0 end-to-end security technology platform, which has passed rigorous thermal runaway propagation tests and is equipped with multi-layered intelligent early-warning and protection mechanisms, thereby establishing a highly reliable energy storage safety system throughout the entire process.
BYD
BYD Energy Storage is a core business division of BYD focused on the energy storage sector. Its business operations date back to 1999, and the company has over 17 years of experience in system operation.
In the first quarter of 2026, BYD Energy Storage officially became the world's leading supplier of energy storage systems, with cumulative system shipments reaching 134 GWh.
Its products are exported to more than 110 countries and regions worldwide, with applications spanning generation and grid-side, commercial and industrial, residential, computing power storage, as well as specialty batteries for forklifts and marine vessels.
Leveraging more than 24 years of technical expertise in lithium iron phosphate (LFP) technology, BYD has successfully developed the Blade Battery-a dedicated energy storage cell-which has become a core competitive advantage.
In 2025, BYD's global shipments of energy storage systems exceeded 60 GWh. In 2026, BYD launched the next-generation high-capacity "Haohan" energy storage system, equipped with 2,710 Ah Blade batteries specifically designed for energy storage, and began mass deliveries.
The company secured a major contract for the world's first GW-scale, all-weather renewable energy project-the 11.275 GWh Masdar project in the United Arab Emirates-entered into a partnership with Spain's Grenergy for a 2.6 GWh solar-plus-storage project in Chile, won the bid for CGN's 1.2 GWh energy storage system project, and implemented multiple landmark projects in key overseas markets such as Saudi Arabia, Europe, and Latin America.
Leveraging the advantages of a vertically integrated full industrial chain, the company has built a comprehensive, self-developed ecosystem covering BESS, PCS, and EMS, and has experience installing over 1.5 million residential energy storage systems.
The company has established a fully closed-loop system spanning R&D, manufacturing, sales, and the recycling and regeneration of end-of-life batteries. It is the world's only leading energy storage system manufacturer that possesses both automotive manufacturing expertise and the capability to deliver energy storage solutions across all scenarios.
Manufacturer Capabilities & Project Scale: In the first quarter of 2026, the company ranked first globally in energy storage system shipments, with cumulative shipments reaching 134 GWh. The company's products are now available in more than 110 countries and regions worldwide, and it has successfully implemented several large-scale, world-class energy storage projects, including a 12.5 GWh project in Saudi Arabia.
BMS / EMS / PCS Integration Capabilities: Leveraging the advantages of in-house R&D across the entire industrial chain, the CTS architecture has established end-to-end coordination among blade cells, battery management systems, energy management systems, and energy storage inverters, achieving deep system-level optimization. Its grid-forming solution ensures stable operation within the main power grid.
Safety: Given the high safety characteristics of lithium iron phosphate blade batteries, this battery pack is equipped with a multi-layered thermal runaway protection system and a full-lifecycle intelligent monitoring system; under extreme operating conditions, its system reliability ranks among the best in the industry.
LG Energy Solution
LG Energy Solution, formerly known as LG New Energy, is a world-leading lithium-ion battery manufacturer that was spun off from LG Chem as a subsidiary of South Korea's LG Group and officially established in December 2020. It was listed on the Korea Exchange in 2022.
LG Energy Solution has over 30 years of experience in battery technology research and development, holds more than 25,000 related patents worldwide, and employs over 32,000 people. The company began mass-producing energy storage batteries as early as 2015, making it one of the world's first battery manufacturers to enter the energy storage sector.
LG Energy Solution is a key local supplier in the North American energy storage market. Leveraging its five dual-purpose energy storage production bases in North America, the company's energy storage revenue surged 4.6 times year-over-year in the first half of 2026. New order value exceeded 3 trillion won, accounting for over 20% of total revenue. LG Energy Solution secured a three-year long-term energy storage supply contract with Tesla worth over 30 billion yuan, as well as a 6 GWh order worth over 10 billion yuan from DTE Energy in the U.S., and is also supplying ESS for Google's largest solar-plus-storage project.
LG Energy Solution is accelerating its mass production plans for sodium-ion batteries, simultaneously constructing pilot and main production lines in both China and South Korea, with long-duration energy storage (over 6 hours) as its core application focus. Leveraging its global production footprint and deep technological expertise, LG Energy Solution is poised to become a leading player in the global energy storage market, offering both supply chain stability and technological reliability.
Manufacturer Capabilities & Project Scale: The company operates five energy storage manufacturing facilities across North America, and its ESS production capacity in North America is expected to exceed 50 GWh by 2026. The company has successfully secured Google's largest solar-plus-storage project and a three-year long-term order from Tesla, and is one of only three energy storage partners worldwide to be among the first to receive DSX Ready certification from NVIDIA.
BMS / EMS / PCS Integration Capabilities: The in-house developed JF2 series modular energy storage system employs a dual AC/DC link architecture, enabling it to accommodate various scenarios and support compatibility with mainstream PCS units from multiple brands, thereby facilitating the rapid deployment of AI data center-class energy storage clusters.
Safety: The entire product line has passed the rigorous UL 9540A safety tests and is equipped with multi-layered thermal runaway early warning and protection mechanisms. It has been optimized for full-lifecycle safety redundancy specifically for applications in North American power grids and data centers.
EVE Energy
EVE Energy was founded in 2001 and is headquartered in Huizhou, Guangdong. In 2009, it was one of the first companies to list on the ChiNext board of the Shenzhen Stock Exchange, under stock code 300014. The company is a leading global platform-based manufacturer of lithium-ion batteries and ranked among the top three global energy storage technology suppliers in 2024. In 2025, shipments of energy storage batteries reached 71.05 GWh, surpassing power batteries for the first time to become the company's largest business segment.
EVE Energy has established 11 advanced manufacturing bases worldwide, with a total production area exceeding 2.8 million square meters. The 60 GWh energy storage bases located in Jingmen and Shanghang, Fujian, among other locations, have already entered the production ramp-up phase.
As of 2026, total energy storage orders have exceeded 152 GWh. The company has secured several major contracts from industry leaders, including a 60 GWh long-term supply agreement with Godawari in India and a 10 GWh large-scale battery system partnership with State Grid Technology.
The company's core product, the 628Ah high-capacity energy storage cell, has become a key competitive advantage in the market. In addition, the company has launched a full series of "Mr. Giant" high-capacity liquid-cooled energy storage systems with capacities of 5 MWh and 6.9 MWh. These products have obtained a full suite of international certifications, including the TÜV Mark and CE, and are fully qualified for delivery to the European and Australian markets.
The company has a research and development team of over 6,500 people, with R&D investment accounting for approximately 6% of revenue, and has filed more than 16,000 patent applications to date. In December 2024, the company obtained the world's first TÜV SÜD Mark certificate for traction batteries compliant with the new EU Battery Regulation; in September 2025, the company officially launched the "Battery Passport," enabling full-lifecycle traceability of batteries.
The company is currently advancing the construction of a localized manufacturing base in Hungary, and construction of the Huizhou Sodium Battery headquarters project is scheduled to begin in 2026. Leveraging its synergistic strategy across multiple technology routes-including hydrogen, lithium, and sodium-the company has become a leading player in the global energy storage market, combining regulatory compliance, delivery capabilities, and technological reliability.
Manufacturer Capabilities & Project Scale: In 2025, energy storage battery shipments reached 71.05 GWh, firmly securing the company's position as the world's second-largest supplier; in 2026, its order backlog exceeded 152 GWh. The company operates 11 manufacturing facilities worldwide and has successfully completed the world's first 400 MWh standalone energy storage power station benchmark project in Lingshou, Hebei.
BMS / EMS / PCS Integration Capabilities: Based on a 628Ah high-capacity cell platform, we have developed a full-stack BMS control solution that supports efficient integration with PCS units from leading brands. Combined with our proprietary intelligent balancing and thermal management technologies, this solution meets the demands of long-duration energy storage and data center applications.
Safety: The entire product line has passed the UL 9540A thermal runaway test and received a full suite of international certifications from TÜV. It features a multi-layered safety protection system and a battery passport traceability system covering the entire product lifecycle. The system's stability under extreme operating conditions has been validated through large-scale projects.
Huawei Digital Power
Huawei Digital Energy is a wholly-owned, core strategic business unit of Huawei Technologies Co., Ltd. Its operating entity-Huawei Digital Energy Technology Co., Ltd.-was officially incorporated in June 2021. Headquartered in Shenzhen, the company has a registered capital of 3 billion yuan.
It currently employs approximately 10,000 people, operates 13 R&D centers worldwide, and conducts business in more than 170 countries and regions. By 2025, Huawei Digital Energy's revenue reached 77.312 billion yuan, making it Huawei's third-largest source of revenue.
Based on the core philosophy of "managing watts with bits," Huawei Digital Energy deeply integrates digital technology with power electronics. Its smart string-based grid-forming energy storage platform, launched in the energy storage sector, passed technical appraisal in 2024 and was rated as internationally leading.
At the end of 2025, the 400 MW/2,400 MWh smart string-based grid-forming energy storage power station-the largest single-unit facility of its kind in China, in which the company participated in its construction-began trial operations after being connected to the grid in Baotou, Inner Mongolia. In 2026, the company launched a new generation of all-scenario energy storage solutions equipped with "grid-forming + AI" technology.
Leveraging its deep technical expertise-as the global leader in PV inverter shipments for nine consecutive years-Huawei Digital Energy has become a highly competitive, top-tier provider of energy storage system solutions in the field of global PV-storage integration.
Manufacturer Capabilities & Project Scale: In 2025, the company's revenue reached 77.3 billion yuan, with operations spanning more than 170 countries and regions worldwide. The company successfully completed several landmark overseas projects, including a 50 MWh project in Hungary, a 20 MW/40 MWh project in the Philippines, and a 2.4 GWh single-site large-scale energy storage project in Baotou, China.
BMS / EMS / PCS Integration Capabilities: The in-house developed FusionSolar 9.0 photovoltaic-storage integration platform leverages our expertise in power electronics to enable end-to-end coordination between the BMS, EMS, and PCS. It employs a mesh-based architecture and supports compatibility with battery cells and equipment from multiple brands.
Safety: This product employs a multi-tiered thermal runaway protection system designed for all operating scenarios. It has passed the rigorous UL 9540A testing and is equipped with AI-powered millisecond-level active early warning and remote intelligent operation and maintenance mechanisms, enabling it to reduce safety risks in energy storage systems throughout their entire lifecycle.
HiTHIUM
HiTHIUM, whose full name is Xiamen Haichen Energy Storage Technology Co., Ltd., was officially established in 2019. The company is the world's second-largest professional energy storage system manufacturer by battery shipment volume and is the only new energy technology company among global GWh-level lithium-ion energy storage battery suppliers that focuses exclusively on the energy storage sector. Currently, the company is in the application stage for an IPO on the Hong Kong Stock Exchange.
As a Chinese National High-Tech Enterprise and a national-level unicorn company, HiTHIUM is deeply committed to full-chain R&D and innovation in battery materials, cells, and systems. It operates four major R&D institutes, employs a team of over 1,100 engineers, and has filed more than 4,300 patent applications worldwide.
Its testing and validation center has received dual certification from TÜV Rheinland and CNAS. HiTHIUM has established a research, production, sales, and service network covering more than 40 countries and regions across key global markets.
Its manufacturing base in Chongqing is the world's first "Lighthouse Factory" in the energy storage battery sector, with a total investment of 13 billion yuan and a planned production capacity of 56 GWh of lithium-ion energy storage batteries and 22 GWh of energy storage modules. As of August 2025, shipments from this facility had exceeded 100 GWh.
The company's product portfolio includes lithium iron phosphate energy storage cells ranging from 50 Ah to 1,300 Ah (including the 1,300 Ah model) as well as multiple sodium-ion battery models such as the N162Ah and 785Ah. The company has also launched the ∞Power series of high-capacity energy storage systems tailored for scenarios of varying durations (2 hours, 4 hours, and 8 hours), as well as commercial and industrial energy storage cabinets and residential energy storage products, capable of comprehensively meeting customized energy storage needs across generation-side, grid-side, commercial and industrial, residential, and off-grid applications.
HiTHIUM is the world's first energy storage manufacturer to successfully complete an open-door combustion test on a 6.25 MWh large-capacity system. Its products have passed numerous authoritative international certifications and received an "A" rating for energy storage financeability.
The company's successfully implemented flagship projects include: the 235 MWh project in Colorado, USA; the 150 MW/300 MWh project in Lianyungang, Jiangsu; the 55 MWh project in Bulgaria; and the 421 MWh project on the Fraser Coast in Australia.
In 2026, the company also signed a battery factory investment agreement with Spanish partners, continuing to advance its global expansion. Leveraging its end-to-end, full-chain integration capabilities, the company has firmly established itself among the top tier of the global long-duration lithium-ion energy storage market and has maintained its position as the world's second-largest energy storage battery shipper for two consecutive years.
Manufacturer Capabilities & Project Scale: The company consistently ranks second globally in energy storage battery shipments. Cumulative shipments from the Chongqing Lighthouse Plant have exceeded 100 GWh, with orders on hand spanning more than 40 countries worldwide.
In addition, the plant has successfully completed several flagship 100-megawatt-scale projects, including a 235-megawatt project in the United States and a 421-megawatt project in Australia, demonstrating its ability to deliver at scale across the entire value chain-from battery cells to complete systems.
BMS / EMS / PCS Integration Capabilities: The in-house developed BMS has obtained IEC 62443 SL-C2 cybersecurity certification and has successfully established full-chain collaboration among the BMS, EMS, and PCS. Leveraging a CNAS-certified all-scenario testing platform, the product has completed cluster-level 3S joint debugging and grid adaptability verification, achieving efficient integration of the system across multiple scenarios.
Safety: This system is the first in the world to successfully complete a full-door fire test for a 5 MWh large-capacity energy storage system and has passed the rigorous thermal runaway validation required by UL 9540A. The system incorporates intrinsically safe designs, such as a high-heat-resistant ceramic-coated separator and a directional pressure relief structure, ensuring that thermal runaway does not spread to adjacent containers even under extreme operating conditions.
How to Identify a Reliable Battery Energy Storage System Manufacturer?
As we mentioned earlier, investing in an energy storage system is a long-term investment. If you don't give it careful thought and choose your supplier wisely from the outset, you'll face many problems down the road.
Therefore, when looking for an energy storage system supplier, you should consider the following questions in advance:
1. Focus on Safety, Not Just Certifications
The greatest risk to energy storage systems stems from safety incidents. Therefore, the first step is to evaluate a manufacturer's safety design capabilities.
This includes not only whether the manufacturer holds certifications such as UL, IEC, CE, and UN38.3, but also whether it has a comprehensive thermal management system, battery management system, multi-level electrical protection, and fire suppression system.
Truly reliable manufacturers will explain their safety architecture and risk control logic to customers, rather than simply presenting a stack of certificates.
2. Evaluate Project Experience and Implementation Case Studies
Energy storage projects involve multiple components, including batteries, PCS, EMS, and grid integration. Manufacturers lacking sufficient project experience will struggle to ensure stable system operation; therefore, it is essential to thoroughly understand their cumulative installed capacity, number of successful case studies, project types, and client base.
3. Examine Cell Sources and Supply Chain Strength
Battery cells determine the lifespan, safety, and performance of an energy storage system, so it is crucial to examine their sources.
High-quality manufacturers will use cells from leading brands such as CATL, BYD, EVE, Gotion High-Tech, and Hithium, or possess their own proprietary cell manufacturing capabilities.
Additionally, it is important to assess their production capacity, delivery capabilities, and supply chain stability to avoid delays in project implementation or the inability to provide spare parts later on.
4. Evaluate System Integration Capabilities
An energy storage system is not merely a simple assembly of batteries, but a comprehensive energy solution.
A reliable manufacturer should possess the capability to integrate Battery Management Systems, Energy Management Systems (EMS), and Power Conversion Systems (PCS), enabling battery management, energy dispatch, remote monitoring, data analysis, and coordinated operation with equipment such as photovoltaic systems, diesel generators, and the power grid.
5. Evaluate Corporate Strength and Long-Term Viability
Energy storage projects typically have a lifespan of 10 to 20 years, so the long-term viability of the partner is critical. Key factors to consider include the company's years in operation, revenue scale, market share, financing background, and industry reputation.
Select a financially sound company that consistently invests in R&D to ensure it has the capacity to fulfill long-term warranty and after-sales service commitments.
6. Verify Compliance with Target Market Requirements
Different countries and regions have varying access standards for energy storage systems.
For example, the European market emphasizes CE and IEC certifications, the U.S. market prioritizes UL certification, and the Australian market may require inclusion on relevant government or industry certification lists.
Reliable manufacturers not only hold the necessary certifications but are also familiar with local regulations and grid-connection requirements, enabling them to assist clients in successfully completing project approvals.
7. Evaluate Customization and Technical Support Capabilities
Since the application scenarios for each energy storage project differ, standardized products often cannot fully meet requirements. Therefore, an excellent energy storage manufacturer should possess the ability to customize aspects such as capacity, voltage, EMS functionality, PCS matching, cabinet structure, and communication protocols, and provide professional technical support during the solution design phase-not merely sell products.
8. After-Sales Service System
Many issues do not surface during the procurement phase but arise during installation, commissioning, and actual operation. Therefore, you should focus on whether the manufacturer has a professional technical team, remote monitoring capabilities, a fault response mechanism, and a spare parts supply system, as good after-sales service is more valuable than a lower purchase price.
9. Consider Total Cost of Ownership, Not Just Price
The lowest quote is not necessarily the best choice. Buyers should comprehensively evaluate system lifespan, cycle life, energy efficiency, maintenance costs, warranty policies, and future expansion costs, as an energy storage system that is slightly more expensive but has a longer lifespan and higher efficiency often delivers a better return on investment.
10. Do they truly understand your application scenario?
Residential energy storage, commercial and industrial energy storage, microgrids, solar-storage-charging projects, and utility-scale energy storage all have completely different system design requirements.
Professional manufacturers will first understand your application needs before providing a tailored solution, whereas unprofessional manufacturers often simply recommend existing products without being able to optimize the design based on the actual circumstances of the project.
Why Choose CoPow as Your Battery Energy Storage System Partner?
Why Can You Trust CoPow? The following 10 key advantages will give you a comprehensive understanding of the competitive edge of CoPow's commercial and industrial energy storage systems.
1. Focus on Customized Energy Storage Solutions
CoPow not only provides standardized energy storage products but also offers in-depth customization based on customers' project requirements-including system capacity, voltage platforms, cabinet structures, PCS matching, EMS functions, and communication protocols-to create solutions that are better suited to actual application scenarios.
2. Utilization of Grade A Cells from Globally Renowned Brands
CoPow maintains long-term partnerships with leading cell suppliers such as CATL, BYD, EVE Energy, and Guoxuan High-Tech, prioritizing the use of high-quality Grade A cells to ensure that energy storage systems offer higher safety, longer service life, and more stable performance.
3. Robust System Integration Capabilities
CoPow not only supplies batteries but also possesses comprehensive BESS system integration capabilities, enabling seamless integration of BMS, EMS, PCS, remote monitoring platforms, and third-party energy equipment to help customers rapidly complete project deployment and operational management.
4. Extensive Overseas Project Experience
CoPow's products have been exported to more than 40 countries and regions worldwide and are widely used in residential energy storage, commercial and industrial energy storage, microgrids, off-grid power supply, and new energy support projects.
This has enabled CoPow to accumulate extensive international project experience and better understand the technical specifications and customer needs of different markets.
5. Rigorous Quality Management System
CoPow operates modern production facilities and automated production lines. From cell screening and PACK assembly to system testing, strict quality control processes are implemented to ensure that every energy storage system undergoes comprehensive validation before leaving the factory.
6. Flexible OEM/ODM Collaboration Models
Whether for brand owners, system integrators, EPC contractors, or energy project developers, CoPow provides one-stop OEM/ODM services ranging from product design and brand customization to mass production, helping customers rapidly develop differentiated products.
7. Comprehensive Smart Energy Management Capabilities
The system supports EMS energy management, precise SOC estimation, remote monitoring, data analysis, and mainstream communication protocols such as CAN, RS485, and Modbus. It enables real-time monitoring and intelligent scheduling of energy storage systems, thereby improving energy utilization efficiency.
8. Stable Delivery Capabilities
Leveraging a mature supply chain system and large-scale production capacity, CoPow can provide customers with stable delivery schedules and continuous supply assurance to meet various needs, from sample testing to large-scale project delivery.
9. Long Service Life and Extended Warranty
Utilizing high-quality LiFePO4 technology, the energy storage system has a cycle life exceeding 8,000 cycles and a design life of over 10 years, backed by a warranty ranging from 5 to 10 years.
10. Professional Technical and After-Sales Support
CoPow provides professional technical support ranging from solution design, product selection, installation, and commissioning to project operation, as well as rapid-response after-sales service to help customers promptly resolve any issues encountered during project operation.
How To Start Your Custom BESS Project With CoPow?
CoPow has a comprehensive process for customizing and delivering energy storage systems, enabling it to provide customers with efficient and reliable one-stop collaboration from project planning through system implementation.
Step 1: Describe Your Project Requirements
Please describe your project, including: application scenarios (e.g., commercial and industrial energy storage, microgrids, solar-storage-charging systems, or backup power), project location, required energy storage capacity (in kWh or MWh), and expected functional requirements.
Step 2: Confirm Technical Specifications
Based on your project requirements, confirm the system parameters. This includes technical requirements such as battery type, system capacity, voltage level, PCS power, EMS functionality, grid-connected or off-grid mode, charge/discharge strategies, and communication protocols.
Step 3: Customize System Design
The CoPow engineering team will provide you with a customized system design solution based on your project requirements, covering battery configuration, PCS selection, EMS logic design, liquid-cooled or air-cooled solutions, fire suppression systems, and cabinet or container structural design.
Step 4: Review Design Drawings and Technical Proposal
The customer confirms the system solution, single-line diagrams, electrical schematics, technical specifications, communication interfaces, and project configuration lists to ensure the solution meets actual application requirements.
Step 5: Prototype Testing and System Validation
For special projects or OEM/ODM projects, CoPow can provide sample testing or system validation services to ensure the system's compatibility, performance, and safety meet requirements.
Step 6: Mass Production and Quality Inspection
Once the solution is confirmed, the project enters the mass production phase. All products undergo cell screening, pack testing, system integration testing, safety testing, and final inspection to ensure delivery quality.
Step 7: Delivery, Commissioning, and After-Sales Service
After product delivery, CoPow provides remote commissioning, installation guidance, system training, and after-sales service to ensure customers can successfully complete project deployment and maintain long-term operations.
conclusion
Differences listed in specification sheets are often overlooked, but once the system is actually up and running, these differences become impossible to ignore.
Looking at the ten companies evaluated in this guide, what truly sets the leading companies apart from the rest are certain common traits: they treat safety as an engineering discipline, rather than a collection of certifications.
They either manufacture their own battery cells or maintain strict control over their cell sources; they are capable of deeply integrating BMS, EMS, and PCS, rather than simply piecing together unrelated components.
They also provide real-world project experience and comprehensive international certifications.
They truly understand the grid-connection regulations and localization requirements of the markets they serve.
A manufacturer that can clearly explain its safety architecture, provide case studies of similar projects, and is willing to stand behind its warranty will almost always deliver better returns than a manufacturer that competes solely on price.
This is precisely the standard CoPow has set for itself.
Are you ready to launch your custom energy storage project?
Whether you need a tailor-made system design, a project feasibility assessment, or a reliable OEM/ODM partner, the CoPow team is ready to support you.
Request a free consultation to receive a customized system solution for your project.
Our engineering team will provide project-specific capacity selection, configuration recommendations, and ROI assessments.
Speak directly with an engineer-not just a salesperson.
