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Mitsui Fudosan Co., Ltd. (“Mitsui Fudosan”) announces that it has made an investment in Exergy Power Systems Inc. headquartered in Bunkyo-ku, Tokyo (“Exergy”), a provider of energy solutions utilizing its proprietary Exergy Battery®, which offers ultra-fast charge and discharge capabilities. The investment was made through Mitsui Fudosan & Innovation Fund (“& Innovation Fund”), a corporate venture capital fund managed by Global Brain Corporation (“Global Brain”).

In Japan’s electricity market, new markets such as the balancing market are emerging as renewable energy becomes a main power source. This shift is accelerating the creation of new businesses that utilize storage batteries and demand response (“DR”). To maximize the value of storage batteries and DR, sophisticated operations that meet market and equipment requirements are essential. Exergy provides services that accelerate the optimization of customers’ electricity usage by operating storage battery systems leveraging its proprietary Exergy Battery® in combination with distributed energy resources at power plants and electricity demand sites.

Mitsui Fudosan has been conducting demonstration initiatives with Exergy in Kashiwa-no-ha Smart City. Since 2025, the two companies have accelerated their collaboration in the “Demand-Side Energy Resource Aggregation Business” led by Mitsui Fudosan and have begun the market deployment and trading of demand-side storage batteries located in Kashiwa-no-ha. Going forward, Mitsui Fudosan will leverage its real estate assets and other resources to accelerate the expansion of its demand-side storage battery business.

In addition to demand-side storage batteries, Mitsui Fudosan is promoting demonstration initiatives and business development in its demand-side energy resource aggregation business by utilizing distributed energy resource equipment within its real estate assets, including air-conditioning systems, hot water supply systems, EV chargers, and generators. Mitsui Fudosan will further strengthen its business development efforts with the aim of transforming real estate assets—traditionally regarded primarily as consumers of electricity—into assets capable of delivering value to local communities and power grids in a society where renewable energy serves as a main power source.

■About Exergy
・Company name: Exergy Power Systems Inc.
・Location: 4-1-16 Yushima, Bunkyo-ku, Tokyo
・Representative: Daisuke Miura
・Founded: May, 2011
・Business description: Energy Management Businesses
・URL: https://exergyworld.com/

■About Mitsui Fudosan & Innovation Fund
・Name: Mitsui Fudosan & Innovation Fund (MF-GB Fund 3 L.P.)
・Manager: Global Brain Corporation
・Fund Size: JPY 15 billion

■About Demand-Side Energy Resource Aggregation Business
・URL: https://www.mitsuifudosan.co.jp/corporate/news/2025/0220/