Masayoshi Son: Nuclear Fusion Is the Future of AI Power — World Needs 3 Terawatts by 2040

What happened

SoftBank founder and CEO Masayoshi Son, at an investor conference on July 14, 2026, predicted that global data center capacity must grow to 3 terawatts by 2040 — nearly 30 times today's level. He identified nuclear fusion as the realistic long-term solution to AI's energy crisis, with natural gas and renewables dominant in the near term.

Context and impact

Son is one of the most active AI infrastructure investors — SoftBank Vision Fund invested in ARM, OpenAI, and several fusion startups including Helion Energy in 2026. The data center energy crisis is real: Ireland now consumes 23% of national electricity for data centers, and Microsoft acknowledged a 25% emissions spike. Son's statements confirm that hyperscalers see energy as the primary constraint on AI growth.

Details

• Prediction: 3 terawatts of data center capacity needed by 2040
• Estimated annual AI investment: $5 trillion globally by 2030
• Near-term solution: natural gas + renewables
• Long-term solution: nuclear fusion
• SoftBank is an investor in fusion startups (Helion Energy, Commonwealth Fusion)