For years, Tesla’s Megapack defined the grid-scale battery market. Utilities from California to Australia lined up to buy the company’s shipping-container-sized battery blocks, and Tesla consistently topped global deployment rankings. That era appears to be over.
BYD, the Chinese battery and electric vehicle manufacturer, shipped more than 60 GWh of battery energy storage systems in 2025, capturing roughly 13 percent of the global market and overtaking Tesla for the first time, according to Benchmark Mineral Intelligence’s annual ranking of system integrators. Tesla reported 46.7 GWh in energy storage deployments for the same fiscal year in its 10-K filing with the U.S. Securities and Exchange Commission.
The gap of roughly 14 GWh is not a rounding error. It represents thousands of megawatt-hours of grid capacity and reflects a broader shift: Chinese manufacturers, armed with vertically integrated supply chains and aggressive pricing, are reshaping who supplies the batteries that keep the lights on when the sun sets and the wind dies down.
The numbers behind the shift
Benchmark estimates that approximately 460 GWh of battery storage systems were shipped worldwide in 2025. BYD’s 13 percent share and Tesla’s roughly 10 percent together account for less than a quarter of that total, a reminder that the market remains deeply fragmented. Dozens of other suppliers, including China’s CATL (the world’s largest battery cell manufacturer, which also competes in storage systems), South Korea’s Samsung SDI, and a range of smaller U.S. and European integrators, split the remaining volume.
Tesla’s 46.7 GWh figure carries a particular kind of credibility. It appears in a formal SEC filing subject to auditor review and legal liability for misstatement, meaning analysts can treat it as a hard floor for what the company actually installed and connected. Tesla’s number covers both its utility-scale Megapack line and its residential Powerwall products, and it represents substantial year-over-year growth.
BYD’s figure, tracked by Benchmark through manufacturer data and project registries, refers to systems shipped rather than systems installed and energized. That distinction matters. A battery shipped to a construction site in Saudi Arabia in November 2025 may not be commissioned and feeding power to the grid until mid-2026. The two companies are, in effect, being measured at slightly different points in the delivery chain, and neither Benchmark nor the companies have published a reconciliation of these definitions.
Where BYD is winning contracts
BYD’s push beyond China has been fast and deliberate. In February 2025, the company announced contracts with Saudi Electricity Company for 12.5 GWh of grid-scale storage across five sites, which BYD described at the time as the largest such deal ever signed. The same press release stated that BYD Energy Storage had cumulatively delivered more than 75 GWh of equipment to over 350 projects in more than 110 countries and regions. That cumulative figure is self-reported and has not been independently audited, but the Saudi contract alone, if fully delivered, would represent more storage capacity than most countries had installed in total as recently as 2022.
BYD’s advantage starts at the cell level. The company manufactures its own lithium iron phosphate (LFP) battery cells, assembles them into modules, builds the power conversion systems, and packages everything into containerized units ready for grid connection. That vertical integration lets BYD control costs at every stage and offer project developers a single point of accountability. Tesla, while it produces cells at its own factories, also sources cells from external suppliers, which introduces different cost and scheduling dynamics.
Regional breakdowns, however, remain opaque. Tesla’s 10-K does not separate energy storage deployments by geography, and BYD’s public disclosures spotlight marquee contracts without providing a full country-level ledger. It is unclear whether BYD’s lead is concentrated in markets where Chinese firms face minimal regulatory friction, such as the Middle East and parts of Southeast Asia, or whether it extends into Europe and North America, where the competitive picture looks very different.
The trade policy wildcard
BYD’s global shipment lead does not automatically translate into dominance in every market. In the United States, Section 301 tariffs on Chinese-made lithium-ion batteries were raised to 25 percent in 2024, and the Inflation Reduction Act’s domestic content requirements steer tax credits toward storage systems with U.S.- or allied-nation supply chains. Those policies make it significantly harder for BYD to compete on price in the American market, where Tesla’s Nevada and Texas manufacturing footprint gives it a structural advantage.
The European Union’s Critical Raw Materials Act and its evolving battery regulation impose their own set of sourcing and sustainability requirements that could complicate Chinese imports over time. And in markets where grid-scale batteries are classified as critical infrastructure, national security reviews can slow or block procurement from Chinese suppliers altogether.
None of this erases BYD’s cost advantage in the dozens of countries that lack such restrictions. But it means the global market share figures tell only part of the story. A utility in Texas and a utility in Riyadh face fundamentally different supplier landscapes, even if both are buying the same basic technology.
What this means for the storage market
Grid-scale batteries have become the primary tool for balancing intermittent solar and wind generation, firming capacity during peak demand, and providing fast-response services like frequency regulation. As of early 2026, the pipeline of announced storage projects worldwide runs into the hundreds of gigawatt-hours, and the supplier decisions being made now will lock in equipment choices for years.
BYD’s rise to the top of Benchmark’s ranking signals that any major competitive tender for grid batteries will likely include at least one Chinese bidder with a cost base that Western manufacturers struggle to match. Tesla remains a formidable competitor with a large installed base, strong brand recognition among utilities, and the advantage of domestic manufacturing in the U.S. But it is no longer the default volume leader in every global ranking.
Whether BYD holds this position will depend on several factors still in play as of June 2026: how quickly its shipped systems translate into commissioned, revenue-generating projects; whether trade restrictions tighten further in key Western markets; and whether competitors like CATL, which has its own massive cell production capacity, mount a more aggressive push into integrated storage systems. The storage market is scaling at a pace that rewards manufacturers who can deliver at volume and on schedule. Right now, by the best available measure, BYD is doing exactly that.
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*This article was researched with the help of AI, with human editors creating the final content.
