Launch of New Residential Solar Power Service 'Sumifu × Enekari FLEXIBLE' with 'Shinchiku Sokkuri-san,' Japan's Top-Ranked Full-Home Renovation Service

Sumitomo Realty Co., Ltd. (hereinafter 'Sumitomo Realty'), Sumitomo Realty Housing Co., Ltd. (hereinafter 'Sumitomo Realty Housing'), Tokyo Electric Power Energy Partner Co., Ltd. (hereinafter 'Tokyo Electric Power EP'), TEPCO Home Tech Co., Ltd. (hereinafter 'THT'), and Denkousha Co., Ltd. (hereinafter 'Denkousha') will begin sales of the new residential solar power service 'Sumifu × Enekari FLEXIBLE' on June 16, 2026, in the one metropolis and three prefectures (Tokyo, Kanagawa, Chiba, Saitama) through the full-home renovation service 'Shinchiku Sokkuri-san.'

This product adopts ultra-light, thin solar panels, significantly easing installation constraints for existing detached homes, while reducing installation costs and maximizing power generation.

'Shinchiku Sokkuri-san' has an annual construction record of approximately 7,000 homes. This service will promote local production and consumption of energy and contribute to stable energy utilization. Sales areas will be gradually expanded in the future, aiming to install 'Sumifu × Enekari FLEXIBLE' in 1,800 homes annually.

■ Background of New Product Development

Achieving carbon neutrality by 2050 has become an urgent issue, particularly in decarbonizing households. Additionally, rising prices, increasingly severe disasters, and changing international situations have heightened uncertainty in the energy environment.

Under these circumstances, the importance of installing residential solar power systems—emitting no CO2 during generation and usable during disaster-related power outages—has increased. National and local governments are actively promoting and even mandating solar panel installations. Solar power is a core system for reducing environmental impact, enabling energy self-sufficiency, and enhancing disaster resilience, making it imperative to create a reliable and accessible installation environment.

Sumitomo Realty and Tokyo Electric Power EP signed the 'Decarbonization Lead Project Agreement' in September 2021 to jointly plan and implement decarbonization-leading initiatives. Under this agreement, THT developed 'Sumifu × Enekari' to promote solar power systems and storage batteries in detached homes. The service is offered not only for new detached homes but also through the full-home renovation service 'Shinchiku Sokkuri-san.'

■ Implementation Background

'Sumifu × Enekari,' launched in 2021, has been well-received primarily for new detached homes, achieving approximately 5,000 sales to date. However, for existing detached homes, installation barriers such as site limitations and initial costs for seismic reinforcement have hindered adoption.

To address these challenges, starting August 2025, Denkousha's ultra-light, thin solar panel 'Flexible Solar G+' was tested on model house roofs managed by the Sumitomo Realty Group. The evaluation focused on: ① workability and durability of ultra-light, thin solar panels; ② compatibility and design integration with residential roofs; and ③ conversion efficiency and anti-glare performance of north-facing panel installations. The following points were confirmed:

＜Confirmed Items＞

〇 Workability and Durability via Adhesive Installation

Confirmed sufficient adhesion performance with roofing materials

Reduced roof load by eliminating the need for drilling holes

〇 Lightweight Design

Confirmed significantly lighter and thinner compared to conventional panels

Eliminated the need for additional seismic reinforcement work, enabling installation directly over roof painting

Achieved a reduction of approximately ¥900,000 (excluding tax) in installation costs

〇 Power Generation Performance and Anti-Glare

Confirmed power generation performance and anti-glare properties under diverse roof conditions, including north-facing installations

Enabled solar utilization with minimal site constraints

These results confirmed that even existing detached homes previously deterred by cost or roof conditions can now adopt the system, leading to the decision to launch the new product.

※ According to a 2025 survey by the Renovation Industry News (ranking companies by number of renovation projects exceeding 5 million yen, where Sumitomo Realty Housing ranked first nationwide)

【Reference】

■ What is 'Sumifu × Enekari'?

'Sumifu × Enekari' is a service that allows solar power systems and storage batteries to be installed in new and existing detached homes constructed by the Sumitomo Realty Group, with zero upfront costs and only a fixed monthly service fee. The service also includes support for equipment repair and replacement.

By strongly promoting the adoption of solar power systems and storage batteries in detached homes, the service maximizes the potential for additional residential solar capacity in Japan. Beyond increasing renewable energy generation, it contributes to balancing electricity supply and demand—a growing challenge as renewable energy expands. By aggregating and utilizing the environmental value of self-consumed electricity generated by customers' solar panels, it significantly contributes to realizing a carbon-neutral society in Japan.

Sumitomo Realty Group
• Constructs custom homes and renovates existing detached homes ('Shinchiku Sokkuri-san' business)
• Promotes adoption of 'Sumifu × Enekari'
• Provides 'ongoing peace of mind' to customers, even during major disasters involving power outages and water shortages

Tokyo Electric Power Group
• Installs solar power systems and storage batteries, and provides repair and replacement support
• Aggregates and utilizes the environmental value of self-consumed electricity generated by solar power

■ Features and Customer Benefits

◎ 'Zero Upfront Cost' – Reducing Financial Burden at Installation

'Sumifu × Enekari' enables installation of solar power systems and storage batteries at 'zero upfront cost,' significantly reducing financial burden at the time of adoption.

◎ 'Ongoing Peace of Mind' – Resolving Concerns with Repair and Replacement Support

Under a 24/7 call center system, support for repairs and replacements during equipment failures ensures 'peace of mind'—customers can still use electricity even during power outages caused by major disasters.

■ Each Company's Initiatives Toward Carbon Neutrality

Sumitomo Realty Group

The Sumitomo Realty Group actively collaborates with all stakeholders to contribute to environmental conservation.

Tokyo Electric Power Group

Under the Tokyo Electric Power Group Environmental Policy, the group contributes to achieving carbon neutrality and building a sustainable society through energy services.

Denkousha

Denkousha contributes to carbon neutrality by comprehensively supporting the use of renewable energy such as solar power, as well as energy-saving and energy-storage solutions.