TEPCO Green Hydrogen Strategy, 1.3 GW Nuclear Restart, 1 INPEX Joint Venture, and 4 Pilot Projects (2023-2026)

TEPCO’s Hydrogen Pilots, 4 Active Locations and Shift to Nuclear Assets (2023-2026)

In 2025, Tokyo Electric Power Company (TEPCO) solidified a risk-averse, domestic-focused hydrogen strategy by leveraging its existing hydroelectric and nuclear power facilities, a significant contrast to competitors pursuing high-capital international supply chains. This approach, formalized within TEPCO‘s DX/GX (Digital/Green Transformation) initiatives, prioritizes building institutional knowledge and testing multiple production pathways within Japan’s unique regulatory and geographical context. By focusing on repowering hydro assets and planning for nuclear-powered electrolysis, TEPCO is building a foundation for a resilient, domestic hydrogen supply chain while minimizing exposure to the geopolitical and economic volatility that has impacted more aggressive global projects.

TEPCO’s Foundational Pilots

The period leading into 2025 was characterized by foundational work and small-scale testing. This began with activities like the September 2023 feasibility study on a large-scale hydrogen energy system, which set the stage for more concrete actions. By 2025, this evolved into active hydrogen projects at four locations utilizing water electrolysis technology and storing the produced hydrogen in absorbing alloys. The formal operation of its “Hydrogen Company” joint venture, as noted in the company’s FY 2025 second-quarter financial results, marked a transition from exploratory studies to an established business structure aimed at expanding these pilot activities.

The Strategic Shift to Nuclear

The most significant strategic development in 2025 was the clear pivot toward leveraging the company’s considerable nuclear fleet. While smaller green hydrogen pilots in locations like Yamanashi Prefecture continued, the plan to restart the 1.3 GW No. 6 reactor at the Kashiwazaki-Kariwa plant in January 2026 signals a move toward large-scale “pink” hydrogen production. This strategy aims to use the stable, zero-carbon power from the nuclear plant to overcome the high costs and intermittency issues associated with hydrogen produced solely from renewables, creating a distinct and potentially more economically viable path to decarbonization compared to peers like JERA.

$5.8 B JERA Deal vs TEPCO Cautious Capital, A Comparative Investment Analysis

Amid a global “green hydrogen reckoning” in 2025 that saw major projects cancelled due to high costs and uncertain demand, TEPCO maintained a conservative capital investment strategy. The company avoided the multi-billion-dollar commitments made by its chief domestic rival, JERA, and instead focused on smaller-scale projects that utilize existing infrastructure. This prudent approach appears calculated to de-risk its entry into the hydrogen market while waiting for production costs to fall and demand signals to solidify.

Global Headwinds and Project Cancellations

The year 2025 was challenging for the global green hydrogen sector, providing a cautionary backdrop for large capital commitments. High-profile projects were postponed or cancelled, including Trafigura‘s A$750 million green hydrogen facility and an Air Products plant valued at $500 million. These cancellations were attributed to persistently high production costs, which remained at $3.50–$6.00/kg for green hydrogen, and a lack of firm offtake agreements, validating the cautious stance taken by companies like TEPCO and some European peers such as EDF.

TEPCO’s Prudent Capital vs. JERA’s Scale

In sharp contrast to the market’s turbulence, JERA made significant international investments. These included a $5.8 billion partnership with BP for lower-carbon hydrogen and ammonia projects and a joint venture with CF Industries to develop a 1.4 million metric ton-per-year low-carbon ammonia plant in the United States. TEPCO, on the other hand, announced no comparable large-scale capital outlays. Its most prominent project, a 10, 000 k W hydrogen system in Yamanashi, demonstrates a focus on incremental, asset-leveraged growth rather than transformative international acquisitions.

Table: Major Hydrogen Project Announcements and Market Shifts (2025)

Hydrogen Alliances, TEPCO’s INPEX JV and Yamanashi Prefecture Cooperation

TEPCO‘s partnership strategy in 2025 was centered on forging domestic alliances to construct local hydrogen value chains and leverage regional expertise. This collaborative approach is designed to build the necessary infrastructure and technical capabilities within Japan, contrasting with strategies focused on importing hydrogen or its derivatives from international partners. These alliances are crucial for navigating the complexities of developing a new energy ecosystem, from production to distribution.

Domestic Alliances for Infrastructure

A key development was the establishment of a joint venture between INPEX and Kanto Natural Gas Development on April 1, 2025. While TEPCO is not a direct party, this move by major Japanese energy players signals a broader trend of domestic collaboration to build out the national hydrogen infrastructure. Such partnerships are essential for sharing technical knowledge, co-investing in distribution networks, and securing the resources needed for ambitious projects, a model also seen in the strategies of firms like Repsol.

Regional Cooperation in Yamanashi

TEPCO‘s ongoing cooperation with Yamanashi Prefecture and the Yamanashi Hydrogen Company, Inc. (YHC) is a prime example of its regional strategy. This partnership underpins the development of a 10, 000 k W hydrogen energy system that leverages the area’s renewable energy potential, particularly through the repowering of existing hydroelectric power stations. This project serves as a testbed for integrating green hydrogen production with local grid management and industrial use cases.

Table: TEPCO and Peer Hydrogen Partnerships (2025)

SWOT Analysis, TEPCO’s Hydrogen Strategy and Nuclear Asset Leverage

TEPCO‘s hydrogen strategy leverages formidable strengths in its existing low-carbon generation portfolio and a de-risked domestic focus. However, this cautious approach creates a potential weakness in speed-to-scale compared to more aggressive competitors and exposes the company to significant domestic regulatory and political risks, particularly concerning its nuclear assets.

Table: SWOT Analysis for TEPCO Hydrogen Initiatives for 2025: Key Projects, Strategies and Partnerships

2026 Outlook, TEPCO’s Kashiwazaki-Kariwa Restart and Pink Hydrogen Viability

The single most critical event for TEPCO‘s hydrogen ambitions over the next 12-18 months is the successful and sustained operation of the Kashiwazaki-Kariwa No. 6 reactor, scheduled for January 2026. This event will serve as the primary validation point for the economic and technical viability of its entire nuclear-to-hydrogen strategy, determining whether it can become a leader in cost-competitive, low-carbon hydrogen production in Japan.

The Kashiwazaki-Kariwa Catalyst

If the 1.3 GW reactor restarts on schedule and maintains stable operation, it will provide a 24/7, zero-carbon power source for electrolysis that is decoupled from the price volatility and intermittency of renewables. This is a significant competitive advantage. The success of this restart will likely accelerate internal planning and investment in the infrastructure required to turn nuclear power into hydrogen fuel, moving the concept from a strategic option to a core business line.

Signals to Monitor in 2026

Following a successful restart, the key signal to watch for will be formal announcements of capital allocation for electrolysis facilities at or near the Kashiwazaki-Kariwa site. Further signals will include the first offtake agreements with industrial users seeking stable, low-carbon fuel. Progress on its geothermal hydrogen project in Indonesia, slated to begin as early as 2027, should also be monitored as an indicator of TEPCO‘s ability to execute its diversification strategy and expand its hydrogen operations internationally.

The questions your competitors are already asking

This report covers one angle of TEPCO’s hydrogen strategy. The questions that matter most depend on your work.

• Japan nuclear plant restart approvals for hydrogen
• JERA ammonia and hydrogen import projects
• TEPCO domestic hydrogen pilot projects
• Cost of hydrogen from nuclear power versus renewables

This report does not answer these. Enki Brief Pro does.

Your question, your angle, your framework. SWOT, PESTL, scenario modelling. The same niche depth, built around the decision your work actually depends on.

Run your first brief in Enki Brief Pro