SoftBank Group has announced its strategic entry into the development and manufacturing of storage batteries in Japan.
This decision is fundamentally driven by the massive energy demands of its expanding AI operations. SoftBank is currently transforming the former Sharp factory in Sakai into a huge AI data center. Such facilities consume vast amounts of electricity and require an exceptionally stable power source to operate without interruption. By producing its own batteries, SoftBank can ensure a reliable backup power supply and better manage energy costs through grid balancing, creating what it calls 'Brain Data Centers'.
This move is best understood through three key drivers. First is the pursuit of 'energy sovereignty' for its AI ambitions. SoftBank has been building a domestic, or 'sovereign AI', ecosystem, including servers developed with Nvidia and Foxconn. Adding in-house battery production is the logical next step, creating a vertically integrated system from hardware to power. This gives them greater control and resilience for their core AI business.
Second, it's a strategic de-risking of the supply chain. Amid global trade tensions, particularly with the U.S. imposing tariffs on Chinese-made batteries, diversifying away from China has become critical. SoftBank's partnership with South Korea's Cosmos Lab on zinc-halogen batteries is key here. This technology avoids lithium and cobalt, which are often processed in China, thereby enhancing supply security. The persistently weak yen also makes importing heavy equipment like batteries more expensive, further encouraging domestic production.
Finally, supportive government policies create a favorable environment for this venture. Japan's 'Green Transformation (GX)' policy and long-term decarbonization auctions offer subsidies and stable 20-year contracts for clean energy projects. These incentives help offset the significant initial investment and make domestic manufacturing economically viable. In essence, SoftBank's battery business is a calculated move to secure its AI future, strengthen its supply chain, and align with national policy.
- Vertical Integration: A strategy where a company owns or controls its suppliers, distributors, or retail locations to control its value or supply chain. SoftBank is doing this by making its own batteries for its data centers.
- Zinc-halogen battery: A type of battery that uses zinc and a halogen element. It is considered safer and avoids the use of rare metals like lithium and cobalt, which are central to current geopolitical supply chain concerns.
- Green Transformation (GX): A Japanese government initiative to shift the country's industrial and energy structure toward cleaner, carbon-neutral technologies, often supported by subsidies and long-term policies.