Entering the Supply-Demand Adjustment Market with Grid-Scale Battery Projects. Starting in Early June, the Company Will Enter the Primary Balancing Power Market to Strengthen Grid Stability and Renewable Energy Integration.

Sustainable Holdings Inc. (Headquarters: Shibuya-ku, Tokyo; Representative Director: Kenta Mogi) announced that its grid-scale battery project, for which the company handled equipment selection and construction, has passed the pre-screening for the supply-demand adjustment market. Following this, the company will enter the supply-demand adjustment market, including primary balancing power, starting in early June 2026. Through this entry, the company will contribute to the stabilization of electricity supply and demand and accelerate the realization of a sustainable energy society. The company has been developing total solutions from equipment selection to construction of grid-scale batteries, upholding the principle of regional coexistence through its energy business. This market entry utilizes the battery assets constructed by the company to fulfill the critical social infrastructure function of stabilizing electricity supply through the supply-demand adjustment market. Leveraging this entry as a foothold, the company aims to increase its presence in the supply-demand adjustment market and improve the quality of its balancing power. By entering the primary balancing power market in early June, the company will take on the vital role of maintaining the frequency of the power grid. The company plans to contribute to the efficiency of the entire power industry by providing flexible balancing power tailored to market needs, utilizing advanced battery control technology.