Global ESS Battery Shipments Double as AI Data Centers and Geopolitics Rewire Supply Chains
Global energy storage system (ESS) battery shipments surged 109% year-over-year in the first four months of 2026, driven by artificial intelligence data center (AIDC) power demands and geopolitical energy realignments.
The 310-gigawatt-hour (GWh) output recorded from January to April indicates the sector is tracking significantly ahead of 2025's growth trajectory, effectively absorbing escalating tariff pressures from Washington. Initial market feedback suggests a structural bifurcation is underway: Chinese manufacturers are aggressively expanding into Europe and emerging markets to offset a sharp contraction in US orders, while South Korean suppliers are capitalizing on American grid bottlenecks to capture premium market share.
Investors are now closely monitoring raw material cost thresholds as a leading indicator for project viability. With lithium carbonate prices in China approaching RMB 200,000 (US$27,777) per ton, battery manufacturers have passed on a 16% price increase year-to-date, testing the demand tolerance of independent power producers globally.
US Tariffs Force Supply Chain Bifurcation
Trade barriers are actively redrawing the global ESS map. Chinese battery exports to the US fell 18% year-over-year in the first four months of 2026, marking a sharp reversal from the 126% growth recorded in 2025. The US now represents just 8% of Chinese manufacturers' end-market mix, down from 21% a year prior, as the implementation of the Outbound Battery Supply Chain Act (OBBBA) and reciprocal tariffs pushing effective rates to 48.4% force American buyers to pivot.
This regulatory moat has created a windfall for South Korean and Japanese manufacturers. Suppliers like LG Energy Solution and Samsung SDI posted over 170% year-over-year shipment growth in the same period, corroborated by a 22% rise in US battery imports from Korea during the first quarter.
In response, Chinese tier-1 suppliers are redirecting capacity toward regions prioritizing energy security. The escalation of Middle East conflicts since March has catalyzed utility-scale procurement across energy-import-dependent markets. Consequently, Chinese ESS exports surged 167% to the European Union and 154% to the Rest of the World (RoW), insulating aggregate production volumes from the US market lockout.
AI Data Centers Unlock Structural Demand
Beyond traditional grid peak-shaving, AIDC infrastructure is rapidly emerging as a structural incremental demand driver. With power grid bottlenecks threatening AI deployment timelines, data center operators are integrating massive onsite storage solutions.
Industry leader CATL is moving decisively to monopolize this high-margin niche, assembling a full-stack AIDC ESS ecosystem through a series of strategic transactions. The company recently acquired a 38.1% stake in VNET Group to secure a nationwide deployment channel, alongside a 49% stake in Zhongheng Electric to integrate high-voltage direct current (HVDC) power architecture.
Crucially, CATL has secured a 60 GWh sodium-ion battery order with Hyperstrong for AIDC deployment starting in the fourth quarter of 2026. Sodium-ion technology, delivering a 15,000-cycle life and sub-second response times, is structurally tailored for the instantaneous load swings characteristic of AI computing. Because ESS batteries represent less than 5% of total AIDC project capital expenditures, developers exhibit high price inelasticity, potentially muting the impact of US tariffs on CATL’s enterprise data center opportunities.
Rising Lithium Costs Test Margin Resilience
Despite robust volume growth, the supply chain is bracing for margin compression as upstream costs rebound. The debate over demand destruction is intensifying as lithium carbonate flirts with the RMB 200,000 (US$27,777) threshold. While some utility-scale projects historically paused when lithium exceeded RMB 150,000 (US$20,833), current market tolerance appears to have shifted higher, supported by improved project return profiles and government subsidies.
China’s domestic market, which accounted for 44% of global demand in early 2026, remains a primary growth engine. Domestic installations grew 123% year-over-year, shielded from global price volatility by aggressive national policy support.
This environment is heavily favoring vertically integrated and diversified players. BYD has expanded its ESS exposure, with storage now contributing over 20% of its total battery shipments in 2026. Meanwhile, component and integration specialists like Sungrow and distributed-generation producer Deye are experiencing a re-rating as emerging markets accelerate the adoption of commercial and industrial (C&I) solar-plus-storage systems to hedge against elevated oil and gas prices.
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