Battery Energy Storage System Market

The global battery energy storage system market size was USD 62.40 Billion in 2025 and is expected to register a revenue CAGR of 13.4% during the forecast period. Market revenue growth is supported by the One Big Beautiful Bill Act, signed July 4, 2025, which preserved the Section 48E technology-neutral investment tax credit for standalone battery storage projects without the placed-in-service deadline applied to solar and wind, giving storage developers a construction window through 2033 at the full credit rate. Sungrow, China, reported in its 2025 annual report that energy storage system revenue reached RMB 37.29 billion, up 49.39 percent year-on-year, with global shipments of 43 GWh, up 53.5 percent, making energy storage its largest business segment for the first time. Fluence Energy reported record third-quarter fiscal 2026 order intake of USD 1.44 billion and a company-record backlog of USD 6.4 billion, while CATL disclosed in its 2025 annual report that its energy storage battery shipments accounted for 30.4 percent of the global market, the fifth consecutive year it has held the top position. Tesla deployed 13.5 GWh of energy storage products in the second quarter of 2026, its second-best quarter on record, bringing cumulative deployments since 2016 to more than 132 GWh. These are some of the key factors driving revenue growth of the market.

Front-of-meter utility-scale systems, behind-the-meter commercial and industrial systems, behind-the-meter data center systems, and residential systems are the principal commercial categories constituting the battery energy storage system market, with grid operators, hyperscale data center developers, and homeowners each requiring different power-to-energy ratios, response times, and safety certifications. For instance, in August 2026, Fluence Energy, United States, secured approximately USD 850 million in data center business during and immediately following its fiscal third quarter, including the company's first large behind-the-meter data center order valued at approximately USD 300 million, alongside approximately USD 550 million awarded from a hyperscaler's portfolio. Canadian Solar reported in its 2025 annual filing that battery energy storage shipments reached 7.8 GWh, an increase of more than 18.6 percent, as the segment's contribution to total company revenue continued to grow.

However, Foreign Entity of Concern restrictions under the One Big Beautiful Bill Act took effect from January 2026, barring developers from claiming Section 48E credits if a project receives material assistance from specified foreign entities, a category that could affect projects reliant on Chinese-linked cell and component supply given CATL's and BYD's combined share of global battery production. Wärtsilä Energy Storage reported in its full-year 2025 results that order intake in Energy Storage remained below 2024 levels for most of the year and cited continued headwinds from elevated United States tariffs and FEOC-related regulatory changes, alongside intensified competition from other suppliers. Fluence Energy itself disclosed that a three-month delay in the construction of its Houston, Texas enclosure factory and initial quality issues at an overseas facility caused third-quarter fiscal 2026 revenue to come in approximately USD 90 million below expectations despite record order intake, illustrating how domestic manufacturing ramp-up execution risk can offset otherwise favorable demand and policy conditions. These factors substantially limit battery energy storage system market growth over the forecast period.

Based on connection type, the global battery energy storage system market is segmented into front-of-meter utility-scale systems, behind-the-meter data center systems, behind-the-meter commercial and industrial systems, residential systems, and microgrid and off-grid systems. The front-of-meter utility-scale segment commands the largest revenue share because grid-scale projects such as Tesla's Megapack deployments and Fluence's utility contracts require the largest individual project sizes and longest-duration systems, and utility and independent power producer procurement continues to represent the majority of gigawatt-hours contracted globally even as behind-the-meter categories grow faster off a smaller base.

Behind-the-meter data center segment is expected to register a rapid revenue growth rate in the global battery energy storage system market over the forecast period. Fluence Energy's disclosure that it secured approximately USD 850 million in data center business during and immediately following its third quarter of fiscal 2026, including its first large behind-the-meter data center order and a major hyperscaler portfolio award, illustrates how AI-driven data center power demand is creating a distinct new BESS demand category alongside traditional grid-services and renewable-firming applications.

• 01What is the global battery energy storage system market size in 2025 and what CAGR is expected during 2026-2035?
• 02What Section 48E investment tax credit provisions for standalone battery storage did the One Big Beautiful Bill Act preserve, and how do they differ from solar and wind treatment?
• 03What Foreign Entity of Concern restrictions took effect in January 2026 and how might they affect Chinese-linked BESS supply chains?
• 04What energy storage system revenue and shipment growth did Sungrow report in its 2025 annual report?
• 05What record order intake and backlog did Fluence Energy report for the third quarter of fiscal 2026, and how much of that was data center business?
• 06What global energy storage battery shipment share did CATL report for 2025, and for how many consecutive years has it held the top position?
• 07How many gigawatt-hours of energy storage did Tesla deploy in the second quarter of 2026, and what is its cumulative deployment total since 2016?
• 08What headwinds did Wärtsilä Energy Storage cite for below-2024 order intake in its full-year 2025 results?
• 09What mandatory testing requirement did IEC 62619:2022 introduce for industrial lithium-ion batteries used in stationary storage?
• 10Why does behind-the-meter data center demand matter more for long-term battery energy storage system market growth than traditional grid-services procurement alone?

This report covers the global battery energy storage system market across all major segments and geographic regions. Primary research combines panel conversations with industry experts and is cross-referenced against company annual reports and government agency data. All market size figures use 2025 as the base year with a 2026-2035 forecast period.