Japan's clean energy future hinges on diversifying supply chains amid China's dominance

Since the Fukushima disaster, Japan has rebuilt a substantial solar fleet yet failed to rebuild a domestic industry. The country now obtains roughly 10% of its electricity from solar panels, a penetration higher than France, the United States and, notably, China, but that generation increasingly rests on imports. According to industry data, Japan relied on foreign-made modules for more than 90% of its installed capacity in 2024,reflecting a structural shift that began in the early 2000s when Japanese firms ceded manufacturing leadership to China.

China’s dominance is stark and expanding. According to pv‑magazine, China exported 235.93 gigawatts of photovoltaic modules in 2024, up 13% year‑on‑year,with Europe alone importing 94.4 GW while demand grew rapidly in the Middle East,Africa and the Asia‑Pacific. Research from Ember shows China’s exports are shifting beyond finished panels: in the first half of 2025 solar cell and wafer shipments jumped 73%,with India, Indonesia and Turkey absorbing most of that component trade. Those trends underline how China now controls not only module assembly but also upstream inputs such as polysilicon and wafers that are decisive for cost and scale.

The commercial consequences are visible. “Because of cheap labor costs and other factors, China could produce inexpensive solar panels and could export and kill Japan, Germany and U.S. production,” said Hiroshi Ohta, a professor at Waseda University. Yuriy Humber of Japan NRG adds a geopolitical dimension,warning that “China has shown it is willing to use the business side for what the United States calls economic coercion,”and that Beijing could restrict cleantech exports if it chose to. For industrial decarbonisation programmes that depend on predictable, large‑volume procurement of panels, cells and batteries,this kind of supplier concentration represents a clear strategic risk.

Human‑rights and compliance risks compound the vulnerability. Observers have linked substantial portions of the solar supply chain to Xinjiang and other jurisdictions where forced labour and poor labour oversight have been alleged. “Allegations of state‑sponsored Uyghur forced labor program participation have plagued solar polysilicon, metallurgical silicon and aluminum production in Xinjiang,” said Seaver Wang of the Breakthrough Institute. Policymakers in the U.S. and EU have responded with import restrictions and tougher due‑diligence regimes; the U.S. Uyghur Forced Labor Prevention Act, in force since 2022, and emerging European mandatory due‑diligence rules are reshaping market access and are already prompting supply‑chain relocation and reshoring in other markets.

Japan’s policy response has been uneven. Government support has historically prioritised traditional fuels and technologies such as LNG and nuclear while cleantech manufacturing subsidies were limited compared with those offered in the U.S. and South Korea. That has left Japan with technological strength in niches such as gas turbines but little capacity in mass PV manufacture. Tokyo has started to shift policy posture,however, channeling R&D and constrained state support into next‑generation approaches such as perovskite cells. “With perovskite, Japan has been quite secretive,” Humber said,noting tighter control over domestic know‑how and selective support for firms pursuing potentially domestic‑manufacturable alternatives.

Perovskite offers an intriguing industrial policy lever: thinner and lower‑material‑intensity cells that could, in principle, reduce dependence on supply chains dominated by China. Yet perovskite’s commercial readiness remains uncertain; questions persist on longevity, degradation and cost competitiveness at scale. Simultaneously, Japan is accelerating support for other decarbonisation technologies with mixed commercial prospects , carbon capture and sequestration,ammonia co‑firing and further nuclear deployment , choices that may reflect energy security priorities as much as climate optimisation.

For industrial stakeholders planning decarbonisation investments, the immediate lessons are practical. Diversify procurement and qualify multiple suppliers for modules,cells and batteries rather than relying on a single geography. Track upstream inputs such as polysilicon and wafers as procurement risks,not merely finished modules. Build commercial relationships in alternative manufacturing hubs , Southeast Asia,India and South Korea are already absorbing Chinese cell and module flows , and consider offtake agreements that incentivise local or regional fabrication. Industry data suggests those regions are growing rapidly;pv‑magazine reports 26% growth in Asia‑Pacific imports of Chinese modules in 2024 while the Middle East and Africa grew even faster.

Ultimately, Japan’s decarbonisation timetable and its industrial strategy are interlinked. Meeting the government’s emissions targets will require large volumes of solar,wind and storage deployed at pace and competitive cost. Achieving that while reducing strategic dependence on a single supplier nation will demand a concerted industrial policy combining targeted subsidies,regulated supply‑chain due diligence,and international partnerships to scale alternative manufacturing. Without that, Japan risks being a leading consumer of clean electricity that nevertheless lacks the industrial basis to insulate its energy transition from geopolitics and supply‑chain risk.