Contributing to the Realization of a Carbon-Neutral Society by Introducing a Rock-Based Thermal Energy Storage Management System

Toshiba Energy Systems & Solutions Corporation

Toshiba Energy Systems & Solutions Corporation and Chubu Electric Power Co., Inc. are jointly conducting a survey and verification project aimed at introducing Japan’s largest-capacity rock-based thermal energy storage management system in Okazaki City, Aichi Prefecture.^* This system is designed to maximize the efficient use of renewable energy and to contribute to the realization of a carbon-neutral society. 
The system works by converting electricity generated from renewable sources into heat, storing such heat in rocks, and supplying the stored energy as heat or electricity when needed. This approach not only helps to balance electricity supply and demand but is expected to reduce environmental impacts as the use of renewable energy expands. 
The project plan is to finalize the optimal installation location and thermal capacity by the end of FY2026, commence phased manufacturing of equipment in FY2027, and begin supplying heat and electricity to residential buildings, public facilities, and businesses by FY2029. 
This technology is expected to deliver significant benefits—not only to the environment by reducing CO₂ emissions but through its advantages in terms of economic efficiency and equipment reliability. 

• This initiative is being carried out under the Ministry of the Environment’s Co-Creation and Cross-Sector Carbon Neutral Technology Development and Demonstration Program. 

• https://www.global.toshiba/jp/news/energy/2025/03/news-20250312-01.html (Japanese)  (Toshiba Energy Systems & Solutions Corporation)