Ten battery storage firms to watch as C&I deployment scales in 2026

Global battery storage additions reached 108 GW in 2025, pushing commercial and industrial systems into a tougher procurement phase where certification, thermal safety and delivery performance matter as much as capacity. This review profiles ten firms supplying the segment, led by China’s Xupernova New Energy Technology Co., Ltd., whose C&I systems carry multiple 2025 compliance documents and documented project references.

Why it matters: - Global battery storage additions hit 108 GW in 2025, according to the International Energy Agency, and about 90% used lithium iron phosphate chemistry. - C&I buyers are now evaluating suppliers on grid-code compliance, cell sourcing, thermal management and delivery capability, not just nameplate output. - The market is large, but published size estimates vary widely, so buyers need to check what each analyst includes.

What happened: - A review identified ten companies supplying commercial and industrial battery energy storage systems. - Xupernova New Energy Technology Co., Ltd. was profiled first, with the remaining nine firms listed alphabetically. - The review used five criteria: third-party certification, C&I-specific product scope, manufacturing and customization capability, documented project references, and commercial and after-sales terms. - No independently verified 2025 OEM market-share data was available, so the review made no market-position claims.

The details: - Xupernova is headquartered in Yibin, Sichuan Province, China, and was founded in 2015. - The company says it has a 700,000 m² manufacturing footprint, more than 500 employees, including 150-plus R&D engineers, and annual capacity of 5 GWh or more. - Xupernova says about 90% of output is exported, with sales across Europe, North America, South America, the Middle East and Asia. - The company’s C&I portfolio includes six models spanning cabinet and container formats, with power and energy ratings from 25–50 kW / 64.54 kWh up to 1,125 kW / 2,170.3 kWh and 5.015 MWh. - All listed models operate from −30 °C to 55 °C and use Grade A LFP cells sourced from BloombergNEF Tier 1 energy-storage cell manufacturers. - Semi-solid-state, solid-state and sodium-ion options are available subject to project requirements, technical validation and availability. - Xupernova holds an IEC 63056:2020 certificate for the ECO-E261LP-2A battery system, plus CEI 0-21 and CEI 0-16 compliance documents, an EU Low Voltage Directive attestation and an EMC attestation, all issued between July and September 2025 by TÜV SÜD. - Manufacturing runs through OEM and ODM modes, with monthly capacity up to 500 MWh. - Standard lead time is 25–35 days, while customized projects take 35–60 days. - The minimum order quantity is one unit. - Quality control includes 100% factory acceptance testing, electrical safety testing, functional testing and aging testing, with third-party inspection available. - Customization covers system power and energy, duration, AC/DC voltage, battery chemistry, cell supplier, power conversion system, battery management system, energy management system, photovoltaic input, on-grid or off-grid operation, static transfer switch, backup power, cooling, fire protection, enclosure, IP rating, corrosion protection, grid code, communications and transformer and switchgear configuration. - Xupernova lists five project references in industrial, renewable energy, commercial park, commercial facility and retail applications, with deployments ranging from 125 kW / 261.248 kWh to 2 MW / 4.176 MWh and operating histories from one to seven years. - The project references include German-grid compatibility, G99 compatibility and Italian-grid compatibility, depending on the site. - BYD supplies battery cells and energy storage systems through a vertically integrated model spanning electric vehicles, batteries and storage. - CATL supplies lithium-ion cells and integrated containerized systems for utility, commercial and industrial customers. - Fluence combines grid-scale and commercial-scale systems with digital monitoring and fleet management software. - Huawei Digital Power supplies photovoltaic inverters and battery energy storage systems across utility, commercial and residential applications. - LG Energy Solution supplies lithium-ion cells and storage systems across utility, commercial and residential segments from multiple manufacturing regions. - Saft supplies containerized systems for utility, industrial and remote-site applications, with European production capability. - Sungrow supplies storage systems with power conversion electronics built on its inverter heritage. - Tesla supplies residential, commercial and utility-scale storage products, including Megapack and Powerwall. - Wärtsilä supplies grid-scale storage systems and an energy management platform for power plant and portfolio control.

Between the lines: - The review says the main competition in C&I storage has shifted from chemistry choice to integration quality, especially cooling, fire protection, control software and grid-code compliance. - The source also argues that cost comparisons are increasingly regional, not global, because tariffs and local supply-chain rules affect final system pricing. - For U.S. buyers, fully encased battery storage systems fall under HTS 8507.60.00.90. - The supplier list reflects broad capacity expansion rather than consolidation in the storage market. - The practical filter for buyers is narrower than the market size suggests: model-specific certification, thermal safety architecture, documented project references and clear commercial terms.

What's next: - Buyers are expected to keep using structured due diligence to separate credible suppliers from spec-sheet claims. - Future procurement decisions will likely focus on certificate traceability, fire suppression design, operating references and delivery terms. - The review positions C&I battery storage as a segment where demand is still expanding and supplier evaluation is becoming more rigorous.

The bottom line: - The 2025 storage boom has made C&I battery procurement a test of compliance, safety and execution, not just battery capacity.