SoftBank Launches Battery Unit for AI Data Centers

SoftBank Group has officially launched its dedicated battery business in Japan, marking a strategic pivot to address the surging energy demands of artificial intelligence infrastructure. The telecommunications giant aims to secure stable power supplies for its expanding network of AI data centers while targeting significant revenue growth through industrial and residential energy storage solutions.

This move comes as global tech companies face increasing pressure to manage the massive electricity consumption associated with training large language models and running inference workloads. By vertically integrating energy storage, SoftBank seeks to mitigate grid instability risks and reduce the carbon footprint of its digital operations.

Strategic Expansion into Energy Storage

SoftBank announced on Monday that it will develop and manufacture battery cells and energy storage systems at the former Sharp Sakai Factory site in Osaka Prefecture. This location is strategically chosen because SoftBank is simultaneously constructing a large-scale AI data center campus on the same grounds. The proximity allows for direct integration of power generation and storage capabilities with high-performance computing facilities.

The company plans to begin full-scale production of battery cells and storage systems in the fiscal year ending March 2028. By the following year, SoftBank intends to scale its production capacity to the gigawatt-hour level. This aggressive timeline reflects the urgent need for reliable backup power in mission-critical AI environments where downtime can result in significant financial losses.

Key Milestones and Targets

• Production Start: Fiscal year 2028 (ending March 2028)
• Capacity Goal: Gigawatt-hour scale by fiscal year 2029
• Revenue Target: 1 trillion yen ($6.5 billion) annually by fiscal year 2030
• Primary Use Case: Powering SoftBank’s own AI data centers
• Secondary Markets: Industrial and residential solar/wind storage
• Global Ambition: Plans to expand operations to overseas markets

Addressing the AI Energy Crisis

Artificial intelligence workloads are notoriously energy-intensive. Training a single large model can consume as much electricity as hundreds of households use in a year. As major technology firms race to deploy more powerful generative AI services, the strain on national power grids has become a critical bottleneck. Traditional energy sources often struggle to provide the consistent, high-volume power required by modern GPU clusters.

Efficient battery technology serves two vital functions in this context. First, it acts as a buffer to ensure uninterrupted power supply during peak demand or grid fluctuations. Second, it helps resolve environmental concerns linked to the rapid expansion of digital infrastructure. By storing renewable energy from solar and wind sources, these systems allow data centers to operate more sustainably.

SoftBank’s initiative aligns with broader industry trends where tech giants are seeking alternative energy solutions. Unlike previous approaches that relied solely on purchasing green energy credits, this strategy involves physical control over energy storage assets. This vertical integration provides greater resilience against volatile energy prices and potential supply chain disruptions.

Innovative Zinc-Halogen Technology

A cornerstone of SoftBank’s new battery division is its collaboration with Cosmos Lab, a South Korean startup specializing in next-generation energy storage. The partnership focuses on developing zinc-halogen battery cells, which utilize aqueous electrolytes instead of the flammable organic materials found in traditional lithium-ion batteries. This chemical difference offers significant safety advantages for densely packed data center environments.

Lithium-ion batteries, while dominant in the market, carry inherent risks of thermal runaway and fire. In contrast, zinc-halogen systems are non-flammable and generally safer to operate at large scales. For data center operators, this means reduced insurance costs and lower safety compliance burdens. The technology also promises longer cycle lives, making it ideal for daily charging and discharging cycles required for grid stabilization.

Technical Advantages of New Cells

• Safety: Non-flammable aqueous electrolytes eliminate fire hazards
• Scalability: Modular design supports easy expansion to gigawatt scales
• Longevity: High cycle durability suitable for frequent grid interactions
• Sustainability: Uses abundant materials like zinc, reducing reliance on scarce metals
• Cost Efficiency: Potential for lower long-term operational costs compared to Li-ion

Market Implications and Future Outlook

SoftBank targets annual sales of 1 trillion yen (approximately $6.5 billion USD at current exchange rates) by the fiscal year 2030. This ambitious goal underscores the company’s confidence in the growing market for commercial and industrial energy storage. While the initial output will prioritize internal consumption for AI infrastructure, subsequent phases will target external customers.

The company plans to supply batteries for industrial applications and residential homes, specifically for storing solar and wind power. This diversification allows SoftBank to build a robust ecosystem beyond just supporting its own tech ambitions. It positions the firm as a key player in Japan’s transition toward decentralized renewable energy networks.

Furthermore, SoftBank is actively considering expanding this business into overseas markets. Given the global nature of the AI boom, similar energy challenges exist in North America and Europe. If successful, the Japanese model could serve as a blueprint for international deployment, potentially partnering with local utilities or cloud providers abroad.

What This Means for the Industry

For developers and businesses relying on cloud AI services, SoftBank’s move signals a shift toward more resilient infrastructure. Reliable power is no longer just a utility concern but a competitive advantage. Companies that secure their own energy supplies may offer more consistent service levels and potentially lower costs due to optimized energy usage.

Investors should watch how SoftBank executes its production timeline. Meeting the 2028 start date will be crucial for maintaining credibility. Additionally, the performance of zinc-halogen technology in real-world scenarios will determine whether it becomes a viable alternative to lithium-ion in large-scale applications. Success here could disrupt the existing battery supply chain dominated by Asian manufacturers.

Ultimately, this launch highlights the convergence of energy and technology sectors. As AI continues to evolve, the boundary between computing hardware and power infrastructure will blur. Firms that master both domains will likely lead the next phase of digital innovation.