Tess Holdings Co.,Ltd. engages in the engineering and energy supply businesses. It is involved in the engineering, procurement, and construction of energy conservation and renewable energy-related facilities. The company also engages in the operations and maintenance of renewable energy power plants; retail supply of electricity; and energy management, remote monitoring, and fuel supply services, as well as energy resource aggregation services, including supply-demand adjustment capacity, imbalance avoidance, rate reduction, and output suppression avoidance to general power transmission and distribution operators, power retailers, and consumers. As of March 31, 2022, its total installed capacity was approximately 215 MW for renewable energy power generation facilities, including 71 solar power plants, 6 wind power plants, and 1 biomass power plant. The company was formerly known as Tess Techno Service Co., Ltd. and changed its name to Tess Holdings Co., Ltd. in April 2018. Tess Holdings Co., Ltd. was founded in 1979 and is headquartered in Osaka, Japan.