Japan’s largest power producer is planning an AI data center beside one of its gas plants, putting electricity supply at the center of the project rather than treating it as a problem to solve later. JERA, Dell and British developer Rhaelm say the first site in Chiba, east of Tokyo, will use about 400 megawatts and is expected to start operating around 2028.
Power first, servers second
The project’s main selling point is time. Instead of waiting for a conventional connection to Japan’s electricity grid, the data center would take power directly from the neighboring JERA plant. Rhaelm chief executive Bradd Lewis said this approach could bring a 400 MW facility online years earlier than a standard grid connection.
That makes the project an infrastructure arrangement as much as a data center build. JERA will provide the site and power, Dell will supply ready-to-deploy server racks, and Rhaelm will manage construction. Private investment firm Apollo is the financial partner.
The planned cost for all phases exceeds $15 billion, or about 2.3 trillion yen. That figure covers the project as described, while a separate estimate puts a much broader rollout at $140 billion. JERA has not confirmed that larger figure, so it should be treated as an outside projection, not the company’s budget.
A template for other JERA sites
JERA generates about one-third of Japan’s electricity, giving it a potential advantage in a market where power access can determine how quickly data center projects move from plans to operation. The partners want to repeat the model at other JERA sites, with the goal of reaching several gigawatts of AI capacity across Japan during the 2030s.
The ambition is large, but the immediate test is narrower: whether a power plant and a data center can be brought together quickly enough to make the arrangement useful beyond a single site. Direct supply avoids one queue. It does not, by itself, establish how quickly the partners can build at other locations.
Japan’s infrastructure race
The project arrives as other investors make their own bets on Japanese AI infrastructure. Blackstone announced plans in June to invest $30 billion in the country’s AI data centers over the coming years.
The pressure is not only commercial. Japan’s digital technology minister has warned that the country could become an “AI colony” if it falls behind in the infrastructure race. In that context, a data center next to a power station is a fairly literal answer to a national concern: secure the computing capacity, and make sure the electricity is close by.
The arrangement may help the first facility avoid years of waiting for a grid connection. Whether it becomes a national model will depend on repeating the build, not just repeating the pitch.