Tess Holdings Co.,Ltd. engages in the engineering and energy supply businesses in Japan. The company involved in the engineering, procurement, and construction of energy conservation and renewable energy-related facilities. It also engages in the operations and maintenance of renewable energy power plants and renewable energy power generation; 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. In addition, the company offers intelligent energy infrastructure. It has installed capacity of approximately 398.6 MW for renewable energy power generation facilities, including 127 solar power plants, and 3 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.