The global energy storage system market is entering a period of rapid expansion as demand for grid stability, renewable energy integration, and flexible power management continues to rise. According to Statista, the global ESS market is expected to grow at a CAGR of around 9% between 2024 and 2031. The market, valued at approximately USD 256 billion in 2023, is projected to surpass USD 506.5 billion by 2031.

Against this backdrop, leading companies, such as Sungrow, WHES, and Tesla, are continuously advancing technologies, expanding production capabilities, and developing more efficient commercial and industrial energy storage solutions. This article explores some of the top C&I energy storage system manufacturers in 2026, highlighting their key technologies and product capabilities.

Quick Overview

Manufacturer	Headquarter	C&I Solutions
Sungrow	China	PV+ESS+EV charging solution, smart energy products
WHES	China	All-in-one or split ESS Solution, smart WHES OS EMS platform
Fluence Energy	USA	Energy storage products and services
Huawei	China	Integrated solar+energy storage solutions
Tesla	USA	Integrated battery systems for large-scale operation
LG Energy Solution	South Korea	Differentiated solutions based on advanced cell technology

Sungrow

Sungrow entered the energy storage business in 2006. The company ranked No. 1 in the global ESS bankability ranking and had installed more than 1,000 GW of converters worldwide as of December 2025.

Sungrow’s C&I energy storage solutions integrate solar inverters, batteries, and EV chargers, with different product combinations available to meet various application requirements. The coordinated system design helps simplify system configuration and supports efficient energy management.

In addition, Sungrow provides smart energy products, including EMS, software platforms, and intelligent gateways, to support system monitoring, energy management, and user operations.

WHES

WHES is a battery energy storage system manufacturer focused on C&I applications. Its energy storage systems have been deployed across more than 800 operational projects spanning over 40 industries and more than 50 countries and regions, built around safe, reliable battery packs and its own energy management software.

WHES provides both all-in-one and split energy storage systems powered by WHES OS, an AI-driven energy management platform that enables natural language interaction and autonomous energy optimization across applications such as peak-valley management, demand response, renewable integration, and other applications.

WHES’s C&I solutions also feature a comprehensive range of safety certifications, proactive monitoring and control functions, and flexible system designs. With pre-installed configurations and modular architecture, WHES systems are designed to simplify delivery, installation, operation, and maintenance.

Fluence

Fluence was formed through a joint venture between Siemens and AES to develop technologies for modern electric infrastructure and energy storage. As of March 2026, the company reported 52 GWh of energy storage and 37 GW of AI-optimized renewables and storage assets across 48 markets.

Fluence provides an energy storage platform built on a configurable system architecture that can be adapted to different application requirements, including utilities, renewable energy projects, and data centers.

The company also offers software solutions, including the Nispera™ asset performance management platform, which supports predictive maintenance, as well as AI-powered software for energy market bidding and optimization.

Huawei FusionSolar

Huawei FusionSolar provides integrated solar and energy storage solutions, which are designed for multiple application scenarios, including industrial manufacturing, low-carbon business campuses, agricultural projects, etc.

Huawei FusionSolar incorporates its Cell-to-Consumption (C2C) dual-link safety architecture, addressing electrical and thermal safety throughout different stages of system operation. The company also adopts a hybrid cooling system, with the energy storage system achieving a round-trip efficiency (RTE) of 91.3% or higher.

In addition, Huawei FusionSolar provides an integrated management platform covering different lifecycle stages and C&I applications. The solutions support transformer-less design, on-grid and off-grid compatibility, and intelligent harmonic suppression functions.

Tesla

Tesla’s Megapack is an integrated battery energy storage system. As of 2026, the company had more than 58 GWh of operational energy storage projects globally, with systems deployed in over 65 countries and an operational uptime of 99.3%.

Each Megapack unit is delivered fully assembled with an integrated foundation and built-in wireways, supporting simplified site preparation and installation processes. The system is designed to comply with more than 40 global safety requirements and includes a 20-year warranty and performance guarantees for long-term operation.

Tesla also provides integrated software for system monitoring, control, and energy optimization, supporting energy management and operational performance across energy storage projects.

LG Energy Solution Vertech

LG Energy Solution Vertech provides battery energy storage solutions based on LG Energy Solution’s cell technologies, with a focus on system lifespan, thermal management, and system integration. As of 2026, the company had 58 GWh of integrated energy storage under construction, or under contract.

The company integrates battery technologies with energy storage systems, software, and analytics capabilities. It also offers a single-vendor approach covering different phases of project development and implementation.

LG Energy Solution Vertech also provides system-level warranties, monitoring services, and operation and maintenance support through its AEROS™ suite.

Conclusion

The C&I energy storage market is developing with increasing demand for flexible power management, renewable energy integration, and reliable energy infrastructure. Companies such as Sungrow, WHES, Fluence, Huawei FusionSolar, Tesla, and LG Energy Solution Vertech continue to expand their energy storage capabilities by improving system integration, safety, efficiency, and operational management.