Japanese tech investor SoftBank to build $33B power plant for AI data centres in US

Japan’s SoftBank Group announced on Saturday that it plans to build a large gas-fired power plant in the US state of Ohio, aimed at supplying energy to support artificial intelligence data centres.

Tech giant SoftBank, a key investor in ChatGPT creator OpenAI, is led by flamboyant CEO Masayoshi Son, a longtime ally of US President Donald Trump.

The natural-gas plant is part of a broader $550 billion Japanese investment in the United States that Tokyo agreed to in exchange for reduced trade tariffs.

Construction of the $33.3 billion power plant with a "large-scale" power generation capacity of 9.2 gigawatts (GW) will take place at the US Department of Energy's Portsmouth site, SoftBank said.

"This is a size bigger than any power plant, I think, in the world," Son said at a ceremony in Ohio to announce the project, on Friday local time.

"At least in the United States, for sure, this is the biggest power generation in one location," he added.

The goal is to develop "the smartest intelligence in the world," Son said.

The 9.2 GW gas-fired plant is part of an overall plan for the site to power 10 GW of data centre capacity, the US Department of Energy said in a statement.

"Once a cornerstone of America's national security during the Cold War, enriching uranium for our nation's defence, the Portsmouth site is now being transformed to help the United States win the AI race," it said.

SoftBank on Saturday announced a consortium with major American and Japanese firms to help build the plant and develop AI infrastructure in Ohio.

Data centres that can train and run chatbots, image generators and other AI tools are being built on a dramatic scale worldwide as an investment boom into the fast-evolving technology shows no sign of slowing.

A study last month found that industrial investment surged by nearly a third in 2025, thanks to investment in AI and data centres in the United States.