Flagship shift to renewables: Chubu Electric’s Taketoyo Unit 5 pushes biomass co-firing

Chubu Electric’s Taketoyo Unit 5, once planned as a coal-heavy thermal plant, is being repositioned with large-scale woody biomass co-firing. The move highlights how the Japanese utility is trying to turn a flagship fossil asset into a lower-carbon power source under tightening climate rules.

Edited by ad hoc news Flagship & Bestseller Desk. Reviewed before publication on 06/15/2026 at 3:24 PM ET. Details in the imprint.

Chubu Electric Power’s Taketoyo Unit 5 thermal power plant has become a flagship example of how Japan’s regional utilities are trying to retrofit big fossil-fuel projects for a lower-carbon era. The 1,070 MW unit, designed as an ultra-supercritical coal-fired plant, is being operated with significant woody biomass co-firing to cut lifecycle emissions while keeping baseload power flowing to the Chubu region.

How Taketoyo Unit 5 is being repositioned

Taketoyo Unit 5 is located in Taketoyo-cho, Aichi Prefecture, and uses an ultra-supercritical pressure boiler and steam turbine, a high-efficiency configuration that allows the plant to generate more electricity per unit of fuel compared with older subcritical units. Chubu Electric describes the unit as having a rated output of about 1.07 GW, making it one of the larger single coal units in its fleet, and it has been developed to support stable power supply in the Nagoya metropolitan area and surrounding industrial zones. To support Japan’s 2050 carbon-neutral target, the company has added large-scale woody biomass co-firing capability, with dedicated biomass handling and combustion systems integrated into the coal plant design, allowing a share of the thermal input to come from renewable fuel rather than imported coal. Chubu Electric’s environmental report outlines Taketoyo Unit 5’s high-efficiency, biomass co-firing configuration and its role in the company’s decarbonization roadmap.

The shift to biomass co-firing at Taketoyo Unit 5 is not just a technical retrofit but also a response to regulatory and social pressure around coal in Japan. The project has faced environmental litigation and stricter scrutiny of coal plant emissions, prompting Chubu Electric to emphasize both efficiency and the use of “carbon-neutral” woody biomass sourced under sustainability criteria. As part of this repositioning, the utility has highlighted that co-firing a substantial proportion of biomass can reduce the plant’s net CO2 emissions compared with a pure coal configuration, while utilizing existing grid connections and port infrastructure. The facility incorporates dedicated equipment for receiving, storing and conveying wood-based biomass fuel, including covered storage to manage moisture and quality, and it is designed to adjust the biomass co-firing ratio depending on fuel availability, price signals and system demand. Japanese energy trade press has reported that at commercial operation the unit already incorporated biomass capability, with the co-firing ratio targeted to increase over time compared with initial design assumptions.

From an operational standpoint, Taketoyo Unit 5 is intended to serve as a key thermal backup for variable renewables in Chubu Electric’s service area. Japan’s coastal industrial belt in central Honshu consumes large volumes of power, and the company has argued that retiring coal too quickly could threaten security of supply. By running an ultra-supercritical unit with biomass co-firing, Chubu Electric aims to keep capacity available while gradually lowering the emissions intensity per kilowatt-hour. The plant connects into the broader Chubu grid, which has been adding more solar, some onshore wind and growing amounts of offshore wind under development, and the company presents Taketoyo as part of a portfolio approach: keeping high-efficiency thermal online as a complement to renewables rather than an open-ended bet on coal.

The utility has also linked Taketoyo Unit 5 to its intermediate decarbonization goals, such as a 50 percent reduction in CO2 emissions from its domestic power business by fiscal 2030 relative to fiscal 2013 levels. In addition to biomass co-firing, Chubu Electric has explored options such as ammonia co-firing and carbon capture for coal units in Japan, but those technologies are still at earlier stages. Woody biomass is comparatively mature and can be blended into existing boilers with modifications, which is why plants like Taketoyo Unit 5 are being positioned as current workhorses of the company’s transition strategy. The unit’s coastal location simplifies biomass imports alongside coal, allowing vessels to deliver pellets or chips to a port already configured for bulk cargoes, and Chubu Electric’s sustainability disclosures describe how the company evaluates supply chains for forest-derived biomass against criteria such as legal compliance, forest management practices and greenhouse gas accounting.

For electricity consumers in the Chubu region, Taketoyo Unit 5’s operation shows up less in the tariff structure than in broader supply-demand balancing. The unit is part of the portfolio that underpins retail offerings from Chubu Electric and its competitive subsidiaries, including household and business plans that increasingly bundle renewable energy options. Industrial customers, particularly in automotive and manufacturing clusters around Nagoya, have been pushing suppliers to decarbonize in line with global value chain expectations, making it important for the utility to demonstrate that even its thermal assets are moving in a cleaner direction. Japan’s national decarbonization policy also anticipates that regional utilities will not simply add renewables, but will extract more efficiency from existing fossil capacity while the buildout of offshore wind, storage and grid reinforcement accelerates.

Environmental groups remain skeptical about how far biomass co-firing can decouple coal plants from climate impacts, pointing to questions around forest sourcing, land-use change and lifecycle accounting. Chubu Electric, for its part, has stressed that it considers woody biomass carbon-neutral when sourced from properly managed forests and residues, and that it applies procurement guidelines aligned with international standards. By embedding Taketoyo Unit 5 in successive environmental and corporate governance reports, the company underscores the unit’s role as a transitional asset rather than a long-term lock-in to unabated coal. Japan’s Ministry of Economy, Trade and Industry has generally supported high-efficiency coal with co-firing as part of a “realistic” transition pathway, even as it faces pressure from climate advocates and some investors to accelerate a full phase-out of coal-fired generation. A detailed feature by the Japan Times described how legal challenges and community concerns weighed on the Taketoyo project, highlighting how the plant became a test case for whether biomass co-firing can make coal socially and politically acceptable for longer in Japan’s decarbonization push. That Japan Times report traced the legal battle around Taketoyo and documented how Chubu Electric expanded biomass co-firing to address CO2 and air-quality concerns.

For Chubu Electric as a company, Taketoyo Unit 5 sits alongside international investments in renewables, such as stakes in wind and solar portfolios in Asia, as part of a diversification away from purely domestic fossil generation. The plant’s performance and public reception are therefore watched not just by local stakeholders but also by investors who are evaluating how Japanese regional utilities navigate stranded-asset risk and tightening climate disclosure requirements. As of the latest available trading data, shares of Chubu Electric Power Company (ISIN JP3526600006) closed on the Tokyo Stock Exchange at JPY 2,309 on 06/14/2026, reflecting how investors continue to price the utility’s mix of legacy thermal assets and emerging low-carbon projects as it advances its transition strategy. Nikkei’s market data page for Chubu Electric Power lists recent closing prices and contextualizes the company’s valuation among Japan’s major utilities.

Taketoyo Unit 5 in brief: key facts

• Product: Taketoyo Thermal Power Plant Unit 5
• Manufacturer: Chubu Electric Power Company
• Category: Flagship/Bestseller power generation asset
• Launch date: Commercial operation in the early 2020s (after construction and legal delays)
• MSRP / Price: Not disclosed; large-scale utility capital project
• Availability: Operates as part of Chubu Electric’s domestic generation fleet in Japan
• Target audience: Grid operators, large industrial customers, regional power consumers in central Japan
• Key differentiator / USP: Ultra-supercritical coal unit designed with large-scale woody biomass co-firing to reduce lifecycle CO2 emissions while providing stable baseload power

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