#Japan #Setagaya #Tokyu Power Supply #Terumaru Project #Home Battery

The Terumaru Battery Project: Innovating Energy Solutions for Homes Without Solar Power

In a remarkable initiative, Tokyu Power Supply, based in Setagaya, Tokyo, is launching the Terumaru Battery Project. This project aims to facilitate the adoption of home batteries even in residences without solar photovoltaic (PV) systems. Starting June 18, 2026, the project will open early registrations to expand its reach and impact.

The Terumaru Battery Project is part of Tokyo’s efforts to promote battery installations among homes, emphasizing the stability of urban electricity through Demand Response (DR) strategies. The home batteries, managed remotely by Tokyu Power Supply’s demand management system, charge during off-peak hours—when electricity rates are lower—and supply power during peak hours, thus reducing costs for the customer without the need for manual intervention.

This innovative program not only provides financial benefits by lowering electricity bills but also contributes significantly to disaster resilience. In the event of power outages, these batteries can autonomously transition to supply power for household needs, ensuring peace of mind for families during emergencies.

Positive Outcomes from Previous Installations

Analyzing the actual data from homes that installed batteries in 2025, the project revealed substantial savings in electricity costs. In April 2026, for instance, the maximum savings achieved was approximately 0,294 per month, representing a reduction rate of 18.1%. On average, homes saw a reduction of about 8,900 monthly, which translates to a savings of 11.8%. These significant reductions came amidst rising electricity prices due to global circumstances and an increase in renewable energy supply, which allowed better management of charging and discharging optimizations.

Surveys conducted among 2025 participants showed that around 30% experienced noticeable reductions in their electricity bills, leading to a remarkable overall satisfaction rate of 94% for the service. The combination of financial benefits and assurance against power outages made this program widely appreciated.

Embracing Renewable Energy and DR Initiatives

In addition to managing costs, Tokyu Power Supply is also pioneering initiatives related to renewable energy. Following March 2026, the company began large-scale DR implementation by controlling the charging of home batteries during times when the output of renewable sources exceeded demand. This initiative resulted in the effective utilization of renewable energy, generating over 30,000 kWh in demand just within two months.

By streamlining battery management through remote control, the potential of home batteries is being fully realized, not just as individual units but as a collective resource that contributes to the stabilization of electricity networks.

Looking Ahead: The 2026 Enrollment Campaign

Bolstered by the success of the previous year's results and high participant satisfaction, Tokyu Power Supply is commencing the enrollment for the 2026 program. This creates pathways for further battery integration, helping households simultaneously achieve energy security, cost savings, and community-wide electricity stability.

The initiative is designed not only to respond to current electricity demands but also to further support a carbon-neutral society. As part of the enrollment process, participants may register online through a dedicated form provided by Tokyu Power Supply. Successful registrants will also receive limited promotional items, such as a cute Terumaru plush blanket—emphasizing a blend of functionality and community engagement.

Conclusion: Path Towards Sustainable Energy Solutions

As Japan continues to embrace renewable energy solutions, projects like the Terumaru Battery Project represent a critical step toward optimizing energy consumption while enhancing household flexibility against disasters. The ongoing commitment to support consumers with innovative technological solutions fosters a sustainable energy ecosystem. Tokyu Power Supply plans to keep exploring harmonized social models, contributing meaningfully to the challenges at hand and the global goal of carbon neutrality.

For more information about the Terumaru Battery Project, visit Tokyu Power Supply's campaign site.