In February 2025, BYD’s energy storage division signed what it called the largest grid-scale battery storage contract in history: a 12.5 gigawatt-hour deal with Saudi Electricity Company, the kingdom’s dominant power utility. That single contract equals roughly 27 percent of the 46.7 GWh in energy storage Tesla reported deploying across all global markets for the entirety of 2025.
The deal did not come out of nowhere. By early 2026, industry trackers had begun flagging BYD’s rapid climb in global battery energy storage system (BESS) rankings. According to estimates circulating among analysts at firms like BloombergNEF and Wood Mackenzie, BYD’s combined contract wins and shipments in recent quarters have pushed it past Tesla in total BESS deployment volume, with one widely cited estimate placing BYD’s share at roughly 13 percent of global installations in a single quarter. That figure depends on assumptions about the global denominator, which neither tracker has finalized for public release as of June 2026, so it should be treated as an informed estimate rather than an audited fact.
What is not in dispute: the competitive landscape in grid-scale storage has shifted dramatically, and BYD is at the center of that shift.
The Saudi deal and what it signals
Saudi Electricity Company is not a small regional utility. It operates the grid for a nation of 36 million people and sits at the heart of Saudi Arabia’s Vision 2030 plan, which calls for 130 gigawatts of renewable energy capacity by mid-century. In a desert climate where solar panels produce enormous midday surpluses but nothing after dark, grid-scale batteries are not optional. They are the bridge between generation and demand.
BYD’s 12.5 GWh contract is designed to fill that gap. The systems are grid-scale stationary batteries, essentially massive banks of lithium iron phosphate (LFP) cells housed in shipping-container-sized units, engineered to absorb excess solar generation during the day and dispatch it during evening peak hours. Projects of this type typically take 12 to 24 months from contract signing to full commercial operation, depending on permitting, grid interconnection work, and local construction timelines. BYD’s press release did not specify a delivery schedule, so the 12.5 GWh should be understood as a committed pipeline, not yet installed capacity.
Still, the sheer scale of the commitment matters. Before this deal, the largest publicly disclosed single-site BESS projects in the world topped out around 1 to 2 GWh. A 12.5 GWh contract, even if delivered in phases, dwarfs anything previously announced and signals that Saudi Electricity Company is comfortable entrusting national-scale energy infrastructure to a Chinese supplier.
Tesla’s position: dominant but no longer alone
Tesla’s 46.7 GWh deployment figure for 2025, disclosed in an SEC exhibit tied to its annual reporting, is the most authoritative number available for the company’s storage business. It reflects actual Megapack units shipped and installed across projects in the United States, Australia, Europe, and other markets. For context, Tesla deployed roughly 14.7 GWh in 2023 and then surged past 30 GWh in 2024, making the 46.7 GWh figure a continuation of aggressive year-over-year growth.
Tesla has also been expanding manufacturing capacity. Its Megapack factory in Lathrop, California, has been producing at scale since 2023, and the company broke ground on a second Megapack facility in Shanghai. In markets like Australia, where Tesla supplied the landmark Hornsdale Power Reserve (the “big battery” in South Australia), the Megapack brand carries significant credibility with grid operators.
But Tesla’s SEC filing provides only an annual total. It does not break deployments down by quarter, which makes direct quarter-to-quarter comparisons with BYD difficult. Tesla may have shipped disproportionately more storage in certain quarters due to project timing, and without that granularity, any ranking between the two companies at the quarterly level involves assumptions.
What the annual number does reveal is that Tesla is still deploying storage at enormous scale. The question is no longer whether Tesla is a major player. It is whether Tesla can maintain its lead as Chinese manufacturers convert their dominance in battery cell production into dominance in finished, grid-connected storage systems.
BYD’s cost and manufacturing advantage
BYD is the world’s second-largest EV battery cell manufacturer behind CATL, and it produces the vast majority of cells used in its own vehicles and storage products. That vertical integration gives BYD a structural cost advantage. By late 2025, LFP battery pack prices in China had fallen below $70 per kilowatt-hour at the cell level, according to BloombergNEF’s annual battery price survey, with system-level costs for grid storage projects dropping below $100/kWh in some tenders.
Tesla, by contrast, sources cells from suppliers including CATL, LG Energy Solution, and Panasonic, in addition to producing its own 4680 cells. For Megapack, Tesla has relied heavily on LFP cells from CATL. That means Tesla is, in some cases, buying from the same supply chain that BYD controls internally. When a utility evaluates bids for a multi-gigawatt-hour project, the supplier that manufactures its own cells, assembles its own battery modules, and integrates its own power electronics can often undercut a competitor that relies on third-party cell procurement.
Neither Tesla nor BYD disclosed per-kilowatt-hour pricing for their respective projects, so it is impossible to confirm exactly how much BYD undercut competitors on the Saudi deal. But the structural economics favor vertically integrated Chinese manufacturers, and the Saudi contract suggests that pricing played a role.
The geopolitical dimension
BYD’s Saudi win also raises questions that go beyond kilowatt-hours and cost curves. In the United States and parts of Europe, policymakers have grown increasingly wary of Chinese involvement in critical energy infrastructure. The U.S. Inflation Reduction Act steers tax credits toward domestically produced batteries and away from “foreign entities of concern,” a category that includes major Chinese battery firms. Australia, which has been one of Tesla’s strongest storage markets, has also begun reviewing foreign investment in critical minerals and energy assets.
Saudi Arabia operates under different strategic calculations. The kingdom has deepened economic ties with China over the past decade, and Chinese firms are already involved in Saudi telecommunications, construction, and petrochemical sectors. For Saudi Electricity Company, awarding a landmark storage contract to BYD aligns with a broader pattern of pragmatic engagement with Chinese technology suppliers, particularly when those suppliers offer competitive pricing and proven manufacturing scale.
For Western storage companies, the risk is that BYD’s Saudi beachhead becomes a template. Several Gulf Cooperation Council nations, including the UAE, Oman, and Kuwait, are planning large solar and wind buildouts that will require substantial storage. If BYD delivers the Saudi project on time and on budget, it will have a powerful reference case for every future tender in the region.
What is still missing from the picture
Several important data points remain unavailable as of June 2026. BYD has not published audited quarterly BESS shipment figures in the way Tesla discloses annual deployments through SEC filings. That makes it difficult to calculate BYD’s precise global market share with the same confidence applied to Tesla’s numbers. The 13 percent quarterly market share figure referenced in the headline is based on analyst estimates, not a verified BYD disclosure.
It is also worth noting that CATL, the world’s largest battery cell manufacturer, has its own rapidly growing energy storage business and has won multi-gigawatt-hour contracts in China, Europe, and Southeast Asia. Any discussion of who leads the global BESS market must account for CATL’s volume, which some analysts estimate rivals or exceeds BYD’s in certain quarters.
Finally, the distinction between signed contracts and completed deployments matters. BYD’s 12.5 GWh Saudi deal is a commitment, not a commissioned system. Until those batteries are installed, tested, and feeding power into the Saudi grid, the contract represents future capacity rather than current output. Tesla’s 46.7 GWh figure, by contrast, reflects storage that has already been deployed. Comparing a signed pipeline to a delivered total is not apples to apples, and readers should keep that distinction in mind.
Where the storage race goes from here
The global battery energy storage market is projected to exceed 100 GWh of annual deployments within the next two years, driven by renewable energy mandates, grid reliability concerns, and falling battery costs. In that expanding market, there is room for multiple large players. Tesla, BYD, CATL, Fluence (a Siemens and AES spinoff), and several other firms are all scaling aggressively.
But the Saudi contract marks a turning point in perception. For years, Tesla’s Megapack was the default name in grid-scale storage, the product that utilities and regulators pointed to when explaining what large batteries could do for a power grid. BYD’s ability to win the single largest storage deal ever announced, with a major national utility, in a region investing hundreds of billions in energy transition, changes that narrative.
It does not mean Tesla has lost the storage war. It means the war now has more than one front, and BYD has proven it can compete on the biggest stage. The next round of quarterly earnings, regulatory filings, and contract announcements from both companies will determine whether this is the beginning of a sustained BYD lead or a single headline-grabbing deal in what remains a fiercely contested market.
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*This article was researched with the help of AI, with human editors creating the final content.
