Did you know Japan’s data centers, the silent workhorses behind our digital lives, are on track to quadruple their energy demand by 2045? These facilities fuel everything from your favorite streaming shows to critical financial systems and the AI and 5G technologies shaping the future. But powering this rapid growth comes at a cost. The surge in demand is stretching Japan’s energy supply to its limits, raising tough questions about how to keep the digital world running reliably and sustainably. As the nation grapples with this challenge, nuclear energy is stepping into the spotlight as a powerful solution for Japan’s digital future.
In Tokyo’s Mitaka district, the Mitaka Data Center EAST stands as a symbol of Japan’s digital transformation. Operated by NTT DATA, it spans an impressive 38,000 square meters and houses 5,600 server racks, making it one of the most advanced facilities in the country. Designed with cutting-edge features like solar panels, energy-efficient cooling systems, and earthquake-proof construction, Mitaka reflects Japan’s ambition to balance innovation with sustainability. Yet even state-of-the-art centers like this depend heavily on Japan’s overstretched energy grid. With data center power consumption growing by 20% annually, the country faces an urgent challenge: how to power its digital future sustainably.
The numbers paint a startling picture. By 2030, Japan’s data centers could consume up to 90 terawatt hours of electricity, enough to power 30 million households. Globally, energy use from data centers is on track to double between 2022 and 2026, climbing to an incredible 1,000 terawatt hours. These facilities are often called “energy gluttons” for a reason, a single one can use as much electricity as 50,000 homes. To make matters worse, the cloud computing industry now leaves a larger carbon footprint than global aviation.
On top of their massive energy demands, data centers use enormous amounts of water to keep their servers cool, millions of liters every year. For a country like Japan, where water resources are already stretched thin, this is a growing concern. It’s clear that finding smarter, more sustainable ways to power and cool these facilities isn’t just an option, it’s a necessity.
Nuclear energy is the solution Japan needs. Unlike solar or wind power, which rely on the weather, nuclear provides a constant, reliable supply of electricity 24/7. It’s also completely carbon-free during operation, making it essential to achieving Japan’s net-zero emissions goal by 2050. Regions like Kansai and Kyushu, with their nuclear power plants, already enjoy lower electricity costs, an undeniable advantage for energy-intensive industries. A single reactor produces enough power to run multiple large data centers or supply electricity to 750,000 homes, making it the backbone of a sustainable, high-capacity energy strategy.
Some companies are already embracing nuclear energy to power their operations. Tokyo-based cloud gaming company Ubitus KK is eyeing locations near nuclear power plants in Kyoto and Shimane to ensure they have a stable and affordable energy supply for their energy-hungry servers. Meanwhile, SoftBank is working on its “Core Brain” project in Hokkaido, a massive AI hub that’s set to need 300 megawatts of power by 2029. Nuclear energy would be the key to keeping these ambitious projects running smoothly.
The Japanese government is doubling down on nuclear energy to meet the country’s growing power needs. By 2030, nuclear power is expected to provide 20–22% of Japan’s electricity, a big leap from just 5.5% today. Support is growing, too – over 70% of Japanese corporate leaders back restarting nuclear plants, and more than half are in favor of building new ones. Still, public opinion remains cautious, with the memories of Fukushima lingering. Winning back trust will require clear communication, transparency, and showcasing the advanced safety systems that make today’s nuclear technology safer than ever.
Modern nuclear reactors are a world apart from the older designs. Advanced safety features, like passive cooling systems that use natural forces such as gravity, ensure that even in emergencies, the reactors stay safe without relying on human intervention. Reinforced containment structures and control rods that can instantly stop nuclear reactions add extra layers of protection. These innovations make today’s nuclear energy not just efficient but also safer than ever before.
At the same time, Japan is exploring other ways to reduce the environmental impact of data centers. The government is pouring significant resources into green technologies, with the New Energy and Industrial Technology Development Organization (NEDO) committing ¥137.6 billion to make data centers 40% more energy-efficient. Companies like Fujitsu and NEC are stepping up with their own efforts, from renewable-powered facilities to hardware that uses far less energy. Together with nuclear power, these advancements are paving the way for a more sustainable digital future.
Even with all these advancements, challenges remain. Building a nuclear power plant is a long-term commitment—it can take up to 17 years, while a data center can go up in just three. On top of that, strict regulations and public skepticism add extra layers of complexity. Tackling these hurdles will take careful planning and cooperation from all sides, but the potential rewards make it worth the effort.
Japan is in a unique position to lead the way in solving global energy challenges. With limited natural resources but world-class technology and ambitious climate goals, it has every reason to innovate. Pairing nuclear power with cutting-edge green technologies to power its growing digital infrastructure isn’t just practical—it’s a chance for Japan to show the world how to balance progress with sustainability.
As Japan’s digital economy grows at lightning speed, the need for reliable, sustainable energy has never been clearer. Nuclear power, paired with innovative green technologies, offers a way to meet the country’s energy demands while reducing its environmental impact. By embracing this approach, Japan has the chance to create an energy system that not only keeps its data centers running but also serves as a global blueprint for balancing progress with responsibility. The choices made now will shape Japan’s energy future and they’ll influence how the world powers its digital age.
Advisory Committee for Natural Resources and Energy. (2024, June 6). Advisory Committee Holds Hearing on Expected Sharp Increases in Power Demand. Japan Atomic Industrial Forum. https://www.jaif.or.jp/en/news/7105
Atlantic Council. (2024, May). Japan’s economic revitalization requires nuclear energy. https://www.atlanticcouncil.org/blogs/energysource/japans-economic-revitalization-requires-nuclear-energy/
Goto, M. (2024, August 15). Is the Plan to Build New Nuclear Power Plants as Part of GX Efforts Consistent with the Strategic Energy Plan? Renewable Energy Institute. https://www.renewable-ei.org/en/activities/column/REupdate/20240815_1.php
Nikkei Asia. (2024). Boom in data centers challenges clean power goals in Asia. https://asia.nikkei.com/Business/Energy/Boom-in-data-centers-challenges-clean-power-goals-in-Asia
World Nuclear Association. (2024, September 5). Nuclear Power in Japan. https://world-nuclear.org/information-library/country-profiles/countries-g-n/japan-nuclear-power