SoftBank partners with South Korea's Cosmos Lab and DeltaX to mass produce next-gen data center batteries in Sakai, Japan at a scale of 1 GWh/year from FY 2027
SoftBank Group Corp.'s mobile unit said it plans to begin large-scale battery cell manufacturing at its Sakai, Osaka plant to address growing power demand for AI services.
Context & Ripple Effects
SoftBank’s Sakai plan extends its earlier move to repurpose a former Sharp LCD plant for AI-related infrastructure. Related coverage also indicated the company was considering lithium- and cobalt-free cells, linking the project to Japan’s effort to reduce reliance on Chinese battery metals.
The manufacturing push sits alongside SoftBank’s broader buildout of AI compute and cloud capacity through SB Neo, as well as data-center partnerships in Japan. Power availability and resilience are becoming a direct constraint on that strategy, not merely a facilities concern.
First-order effects
- SoftBank’s mobile unit, Cosmos Lab and DeltaX will move from a partnership plan to building a dedicated domestic supply of data-center battery cells at Sakai, targeting 1 GWh of annual production from fiscal 2027.
- The Sakai site gains a second AI-infrastructure role: beyond its planned conversion from display manufacturing, it becomes a production base for equipment intended to support AI-service power demand.
Second-order effects
- SoftBank can potentially tie battery procurement more closely to its own data-center and AI-cloud expansion, reducing exposure to externally sourced storage systems if the Sakai line reaches planned scale.
- The project raises pressure on data-center developers and battery suppliers serving Japan to differentiate on supply security and materials sourcing, particularly where dependence on Chinese metals is a concern.
Third-order effects
- If large operators increasingly manufacture or secure dedicated energy-storage capacity, the AI infrastructure stack will broaden from chips and servers into power-management equipment and battery supply chains.
- The effort points toward a more localized, vertically coordinated approach to AI data-center buildouts in Japan, though the commercial viability of domestic cell production will depend on execution, cost and demand growth.
The trend: AI infrastructure investment is expanding beyond compute capacity toward control of the power, storage and supply-chain inputs needed to operate data centers reliably.