Japan Semiconductor Signs Virtual PPA for Floating Solar

Virtual PPA structure and project scope
The agreement brings together Digital Grid Corporation as aggregator1, OTS LLC, Kunishitaike Mega Float LLC, and Japan Semiconductor Corporation, a manufacturing group company of Toshiba Electronic Devices & Storage Corporation. Under the Virtual PPA2, environmental value*3 generated by the Kunishitaike Solar Power Plant in Kagawa Prefecture will be supplied to Japan Semiconductor.

The Kunishitaike facility is a newly commissioned floating solar power plant and the largest in Western Japan*4, with a total installed capacity of 7,842.1 kW. Unlike conventional PPAs that involve physical electricity delivery, the virtual structure allows Japan Semiconductor to procure renewable attributes separately from its electricity supply, aligning decarbonization targets with operational flexibility.

Emissions reduction and floating solar characteristics
Through the agreement, Japan Semiconductor expects to reduce its annual greenhouse gas emissions by approximately 4,173 t per year*5 on a recurring basis. The use of floating solar generation—where photovoltaic modules are installed on water bodies such as reservoirs—offers technical advantages, including improved module efficiency due to water cooling and avoidance of land development constraints.

Role of Digital Grid and transaction platform
The project was executed via “RE Bridge^®”, an auction platform operated by Digital Grid that connects buyers and sellers of renewable energy, resulting in the conclusion of a “GPA^®”*6. The platform supports transparent matching of renewable energy and environmental value transactions based on customer risk profiles and decarbonization strategies.

Alignment with group decarbonization targets
Toshiba Electronic Devices & Storage identifies climate change mitigation as a core corporate responsibility and is expanding renewable energy adoption across its group sites. This Virtual PPA forms part of a broader approach to carbon neutrality, complementing other measures aimed at reducing emissions from manufacturing operations. Toshiba Electronic Devices & Storage Group has set a target to reduce greenhouse gas emissions from its manufacturing sites by 100% by fiscal 2030*7.

By combining virtual PPAs with additional renewable energy initiatives, the group continues to pursue a diversified and resilient pathway toward long-term decarbonization.

*1 Aggregator: A business that bundles energy resources owned by consumers and stands between consumers and power companies to balance supply and demand and promote the use of consumer energy resources.
*2 Virtual PPA (Virtual Power Purchase Agreement): A contract in which companies and power producers trade only the environmental value (such as non-fossil certificates) of renewable energy, not the electricity itself.
*3 Environmental Value: The value of being environmentally friendly, such as renewable energy that does not emit CO₂. This value is traded via certificates and used for corporate decarbonization management.
*4 Largest floating solar power plant output in Western Japan as of December 2025, according to Toshiba Electronic Devices & Storage.
*5 Calculated based on Tohoku Electric Power's 2023 emission factor (residual) of 0.402 kg-CO₂/kWh.
*6 GPA^®: "Green Purchase Agreement", a proprietary service name for direct trading of environmental value using the FIP system. Designed to stabilize the price of environmental value purchased by consumers.
*7 Includes the purchase of carbon credits.

* RE Bridge^® and GPA^® are trademarks of Digital Grid Co., Ltd.
* Other company names, product names, and service names may be trademarks of their respective companies.
* Information in this document, including product prices and specifications, content of services and contact information, is current on the date of the announcement but is subject to change without prior notice.

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