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SoftBank Group is pursuing an investment in Tokyo Electric Power Company Holdings, Japan’s largest utility, as the AI-obsessed conglomerate tries to solve what may be the single biggest bottleneck in its grand plans: electricity.
TEPCO is reportedly in discussions with SoftBank and at least four other groups, including private equity giant KKR, about potential capital tie-ups. The utility is looking for strategic partners to help restructure its business as demand for power, driven largely by the explosive growth of AI data centers, continues to surge across Japan and globally.
Why SoftBank needs a power company
SoftBank has been on an AI spending spree that makes its previous Vision Fund era look restrained. The company has poured over $30B into OpenAI alone, acquiring roughly an 11% stake. It’s also the majority owner of Arm Holdings, the chip design firm whose architecture underpins most of the world’s smartphones and an increasing number of AI processors.
The company is planning large-scale data center campuses across Japan, including sites in Sakai (near Osaka) and Hokkaido, that will require multi-gigawatt power capacity. For context, a single gigawatt can power roughly 750,000 homes.
Taking a stake in TEPCO would give SoftBank something no amount of money can easily buy on the open market: a more direct and stable power supply chain. Rather than competing with every other tech company scrambling for grid capacity, SoftBank could secure preferential access to one of Japan’s largest electricity producers.
TEPCO’s complicated history
TEPCO isn’t just any utility. It’s the company that operated the Fukushima Daiichi nuclear power plant, which suffered catastrophic meltdowns following the 2011 earthquake and tsunami. Fifteen years later, the utility is still dealing with the financial and operational aftermath of that disaster.
The Japanese government effectively bailed out TEPCO through the Nuclear Damage Compensation and Decommissioning Facilitation Corporation, and the company has spent years trying to rebuild its reputation and balance sheet. Seeking capital partners like SoftBank and KKR represents the latest chapter in that restructuring effort.
The discussions between the two companies are still described as preliminary, with no confirmed deal size or timeline.
SoftBank’s energy play goes beyond equity stakes
In May 2026, SoftBank Corp. launched a gigawatt-hour-scale battery business using zinc-halogen technology, specifically designed to support AI data center power needs and maintain grid stability.
That’s a notable technology choice. Zinc-halogen batteries are cheaper to produce at scale than lithium-ion alternatives and use more abundant materials, though they trade off some energy density. For stationary grid storage, where weight and size matter less than cost and longevity, the economics can be compelling.
SoftBank is also developing power generation and storage solutions beyond Japan, with data center construction planned across the US and Europe. CEO Masayoshi Son has repeatedly framed AI as the defining technology of the coming decades, and he’s clearly decided that controlling the energy supply is as strategically important as controlling the compute.
This vertical integration approach, owning stakes in chip designers (Arm), AI companies (OpenAI), and now potentially utilities (TEPCO) while building proprietary battery storage, mirrors what other tech giants are attempting. Microsoft has signed nuclear power deals. Amazon has invested in small modular reactors. Google has contracted for geothermal energy.
What this means for investors
For TEPCO shareholders, a SoftBank investment could provide both capital and strategic direction at a moment when the utility sector is being fundamentally reshaped by data center demand. The involvement of KKR and other groups suggests competitive bidding dynamics that could drive favorable terms for TEPCO.
For SoftBank investors, the TEPCO discussions signal that Son’s team recognizes the physical constraints on AI growth and is willing to invest heavily in solving them. The risk, as always with SoftBank, is execution. The company’s track record includes spectacular wins like Arm and equally spectacular misses like WeWork. Buying into a utility still carrying Fukushima-related liabilities adds a layer of complexity that spreadsheets alone won’t resolve.
Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our Editorial Policy.
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