BYD has overtaken Tesla to become the world's largest battery energy storage system (BESS) integrator, according to figures published on 13 May 2026 by Benchmark Mineral Intelligence. The Chinese manufacturer shipped more than 60 GWh of stationary storage in 2025, taking a 13% share of a global market that grew 51% to about 315 GWh. Tesla deployed 46.7 GWh — up 49% year on year — but slipped to second place with roughly 10% of the market.
The Headline Numbers
| Integrator | 2025 BESS deployments | Global market share |
|---|---|---|
| BYD | >60 GWh | ~13% |
| Tesla | 46.7 GWh (+49% YoY) | ~10% |
| Global market | ~315 GWh (+51% YoY) | 100% |
For context, in December 2025 alone China commissioned 65 GWh of large-scale battery storage — more than the entire United States deployed across the full year. Eight of the top 10 integrators in Benchmark's ranking are now Chinese, and total cell shipments for stationary storage nearly doubled to over 600 GWh.
Why BYD Pulled Ahead
BYD's advantage is structural. The company manufactures its own LFP cells through the in-house Blade platform, which means it controls the entire stack from electrode to integrated container. Tesla buys Megapack cells from external suppliers — primarily CATL and LG — and adds the integration layer itself, so it absorbs a margin BYD does not.
The gap widened in late 2025 when BYD unveiled its Haohan system, a 14.5 MWh standard configuration with nearly three times the energy of a single Tesla Megapack. That product specifically targets utility-scale buyers who want fewer site connections per megawatt-hour, a class Tesla had largely had to itself.
What It Means for Tesla Energy
Losing the top spot does not mean the Tesla Energy business has shrunk. The 46.7 GWh figure is the company's highest annual deployment to date and reflects a 49% growth rate that most non-Chinese competitors would still envy. Tesla is also building new dedicated Megapack capacity at Lathrop in California and Shanghai in China, with the Shanghai factory now feeding utility projects across Asia and Australia.
What the data does signal is that scale alone will not protect Tesla's storage margins. Chinese integrators are growing twice as fast as the underlying market, and price-per-kilowatt-hour pressure from products like Haohan is already showing up in utility tender results across Europe and the Middle East.
European Implications
Europe is still a small slice of global BESS deployment, but the same competitive logic is starting to play out. Grid operators in Germany, the UK and Spain are increasingly running open tenders rather than negotiating sole-source deals, and Chinese integrators have begun winning frequency-response and capacity-market contracts that would have gone to Tesla or Fluence two years ago. Tesla still has an installed-base advantage with brands like Octopus Energy and the UK's National Grid, but the trajectory of 2025 suggests every renewal cycle from here on will be contested on cost.