Rezil Acquires Certification as Aggregator to Advance Aggregation of Distributed Energy Resources

"Standing as a nexus to continuously confront societal challenges" is the purpose of Rezil Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; President and CEO: Yasuzumi Tani, hereinafter "the Company"). The Company announces that its notification to the Minister of Economy, Trade and Industry, under the Designated Wholesale Electricity Supplier System, as a designated wholesale electricity supplier (aggregator), was accepted on May 14, 2026. (※1)

With this certification, the Company can now advance aggregation initiatives targeting distributed energy resources owned by third parties, including solar power plants and battery storage systems.

※1: For registration details, please refer to the "List of Designated Wholesale Electricity Suppliers" on the Agency for Natural Resources and Energy, Ministry of Economy, Trade and Industry website.

■ What is a Designated Wholesale Electricity Supplier (Aggregator)?

A designated wholesale electricity supplier (aggregator) refers to a business entity that aggregates, manages, and controls distributed energy resources—such as solar power plants and battery storage systems—scattered across various locations, enabling their efficient collective utilization. By operating multiple resources as a single integrated unit, aggregators contribute to the effective use of renewable energy (hereinafter "renewables") and help balance electricity supply and demand.

■ Background of Certification Acquisition

As renewables become a mainstay power source, the environment surrounding distributed energy resources is undergoing significant changes, including the transition from the Feed-in Tariff (FIT) system to the market-linked Feed-in Premium (FIP) system and the expanded use of grid-scale battery storage. Consequently, asset-owning businesses are now required to perform more sophisticated demand-supply management, such as forecasting electricity market prices and responding to imbalances.

To date, the Company has leveraged its expertise in demand-supply management and AI-based forecasting technologies developed as a retail electricity provider to promote efficient energy utilization through the operation of its own resources. Looking ahead, the Company believes it is essential to expand these initiatives beyond its own assets to include resources owned by third parties.

In light of this context, the Company submitted its notification as a designated wholesale electricity supplier. Building on this notification’s acceptance, the Company will advance aggregation initiatives targeting third-party-owned solar power plants, battery storage systems, and other distributed energy resources.

■ Future Initiatives

Moving forward, the Company will advance efforts to provide aggregation services to power generators, end-users, and other businesses that own—or are considering owning—distributed energy resources.

Specifically, the Company plans to offer support leveraging its accumulated demand-supply management expertise and forecasting technologies, focusing on post-transition operational support for power generators with FIT solar plants under the FIP system, as well as operational support for grid-scale battery storage systems.

Through integrated management and control—orchestration—of multiple energy resources, the Company will maximize the value of distributed energy resources and contribute to the effective utilization of renewables and the stabilization of electricity supply.

■ About Rezil Co., Ltd.

Rezil upholds the purpose of "standing as a nexus to continuously confront societal challenges." By combining technological innovation with over 30 years of expertise in power operations, the Company contributes to the realization of a decarbonized society through optimal energy control.

Under the mission of "making decarbonization effortless," Rezil operates three core businesses: distributed energy, green energy, and energy digital transformation (DX). The Company provides convenient and reliable services that enable businesses, individuals, and local governments to contribute to decarbonization seamlessly and unconsciously.