Otsuka Pharmaceutical Co., Ltd.
Corporate
January 19, 2026
Otsuka Pharmaceutical Expands On-Site Solar Power Facilities at Factory Premises
Accelerating Carbon-Neutral Initiatives
Otsuka Pharmaceutical Co., Ltd. (Otsuka) has announced the launch of solar power generation systems at the Tokushima Second Factory and expanded existing systems at the Tokushima Itano, Takasaki, Tokushima and Tokushima Mima Factories. These systems became operational between September 2024 and December 2025. As a result of these initiatives, annual CO2 emissions are expected to be reduced by approximately 3,189 tons across the six domestic factories where these systems have been installed.
Otsuka has also transitioned approximately 84% of its domestic electricity consumption to CO₂-free power sources, and its efforts to generate renewable energy in-house directly contribute to decarbonization.
Newly installed and expanded solar power generation systems at each factory (From left to right: Tokushima Factory, Tokushima Second Factory, Tokushima Mima Factory)
As part of Otsuka group's sustainability initiatives, which identify "Reducing Environmental Impact" as one of its material issues, Otsuka is actively working toward achieving its CO₂ reduction targets under the "Carbon Neutral" commitment.
Since 2021, Otsuka has been actively introducing solar power generation systems at its manufacturing facilities in Japan. Currently, such systems are operational at six factories: Tokushima Itano2, Takasaki3, Tokushima4, Tokushima Mima5, Tokushima Second6, and Tokushima Wajiki7. In addition to implementing CO₂-free electricity across all eight domestic manufacturing facilities8 and utilizing Green Power Certificates9 for all office locations outside factory premises, the Otsuka group is also promoting further CO₂ reductions throughout the entire supply chain, including initiatives such as the increased use of SAF9 for air cargo transportation.
In addition to these initiatives, Otsuka is advancing efforts to improve the efficiency of group-wide integrated energy management by establishing an integrated energy service framework. Through the centralized procurement of renewable energy and the supply of generated electricity, the group is working to maximize energy-use efficiency.
Otsuka will continue to promote the active adoption of renewable energy, along with initiatives to maximize energy-use efficiency, as it works toward the realization of a low-carbon, sustainable society.
●Solar power generation systems at Otsuka Pharmaceutical factories
| Launch of operations | Number of panels | Estimated generated electricity | CO2Targeted reduction in CO2emissions (annual)12 | ||
|---|---|---|---|---|---|
| Tokushima Itano Factory | Pharmaceutical Factory (Phase one) |
December 2021 | 408panels | 237MWh | 100tons |
|
Pharmaceutical Factory |
February 2025 | 136panels | 113MWh | 48tons | |
| Soylution Factory | January 2023 | 1,056panels | 661MWh | 279tons | |
| Takasaki Factory | Phase one | December 2022 | 544panels | 284MWh | 120tons |
| Phase two | November 2023 | 460panels | 240MWh | 101tons | |
| Phase three | November 2024 | 270panels | 137MWh | 58tons | |
| Tokushima Factory | Phase one | November 2023 | 185panels | 123MWh | 52tons |
| Phase two | November 2025 | 199panels | 128MWh | 54tons | |
| Tokushima Mima Factory | Phase one | January 2024 | 717panels | 483MWh | 204tons |
| Phase two | December 2024 | 424panels | 322MWh | 136tons | |
| Phase three | December 2025 | 2,253panels | 1,713MWh | 723tons | |
| Tokushima Second Factory | Phase one | September 2024 | 272panels | 204MWh | 86tons |
| Phase two | December 2025 | 70panels | 41MWh | 17tons | |
| Tokushima Wajiki Factory11 | September 2024 | 4,848panels | 2,872MWh | 1,212tons | |
| total | 3,189tons | ||||
*1
- 1
CO₂ reduction achieved by using in-house electricity compared with conventional electricity
- 2Production of pharmaceutical and nutraceutical business products.
- 3Production of nutraceutical business products.
- 4Production of pharmaceuticals.
- 5Production of pharmaceuticals.
- 6Production of pharmaceutical and nutraceutical business products.
- 7Production of pharmaceutical and nutraceutical business products.
- 8Tokushima Factory, Second Tokushima Factory, Tokushima Wajiki Factory, Tokushima Itano Factory, Tokushima Mima Factory, Saga Factory, Takasaki Factory, Fukuroi Factory, as well as laboratories and offices within the factory premises.
- 9
In the Green Power Certificate system, the environmental added value of power produced from renewable energy sources is certified by a third-party certification entity, with Green Power Certificates issued as tradable items.
- 10Sustainable Aviation Fuel.
- 11Information on the solar power generation systems installed and managed by Otsuka Holdings, specifically those utilized at the Tokushima Wajiki factory.
- 12Calculated using the alternative value (0.000422 t-CO₂/kWh) published by Japan's Ministry of the Environment in its "Emission Factors by Electric Utility" on August 1, 2025.
Based on the corporate philosophy of 'Otsuka-people creating new products for better health worldwide,' Otsuka Pharmaceutical continues to contribute to the health and well-being of people around the world.
Reference: Otsuka's sustainability initiatives for carbon neutrality
Otsuka operates its business based on a corporate philosophy centered on contributing to health. In line with this mission, the company has identified four key material issues (materiality) and is actively working to address them while striving to realize a sustainable society.
Under "Reducing Environmental Impact," one of Otsuka group's material issues, Otsuka is advancing initiatives aimed at achieving carbon neutrality by mitigating climate change caused by global warming. These initiatives include not only the installation of solar power generation systems, but also efforts to reduce CO₂ emissions across the entire business value chain.
・Introduction of CO2-free electricity at all eight factories in Japan
Since April 2020, all manufacturing activities have been powered by CO2-free electricity, derived from renewable energy sources that do not emit CO2. This has been implemented at all 8 plants in Japan for all purchased electricity used in production activities.
・Adoption of Green Power Certificates
Adoption in 2020 of Green Power Certificates for all offices of five Otsuka group companies in Japan has resulted in replacement of annual electricity consumption with green power.
・Promoting CO₂ reduction across the entire supply chain
In 2024, Otsuka participated as a consignor company in the Tokyo Metropolitan Government's initiative to promote the use of SAF in air cargo transportation as part of efforts to address Scope 3 emissions. Through such initiatives, the company continues to advance CO₂ reduction measures across its entire supply chain.
・Maximizing energy efficiency
At the Otsuka Group Energy Management Building, completed in July 2023, the group centrally manages integrated energy operations, including the bulk procurement of renewable energy, electricity demand forecasting and supply, as well as the management of water, electricity, and heat at the Kawauchi area factories in Tokushima, in order to reduce CO₂ emissions and maximize energy-use efficiency.
Otsuka Pharmaceutical sustainability - carbon neutrality
Carbon Neutrality | Otsuka Pharmaceutical Co., Ltd.
Otsuka Pharmaceutical sustainability handbook（in Japanese)
handbook.pdf
1
About Otsuka
Otsuka Pharmaceutical Co., Ltd. is a total healthcare company that focuses on each individual's potential to enhance their well-being. Our medical-related business provides treatments and diagnostics for both physical and mental health. Our nutraceutical business supports daily health maintenance and improvement. Otsuka's unique products and services are based on scientific evidence, under the guidance of our corporate philosophy: Otsuka-people creating new products for better health worldwide.
For further information, please visit. www.otsuka.co.jp/en/
Latest Corporate News Releases