TTCL Public Company Limited, together with its subsidiaries, designs, procures, and constructs integrated industrial factories in Thailand and internationally. The company operates in two segments, Energy Business and Construction Business. It offers engineering design services for civil structures and utility systems, such as electricity, water, air conditioning, solid and wastewater treatment systems, storage tanks, production processes, and petrochemical and chemical plants, as well as engages in the procurement of machinery and equipment, and plant construction activities. The company also generates and sells electricity through natural gas-fired power plants and solar power plants, as well as invests and develops renewable energy power plants and invests in energy business. In addition, it offers conceptual study, pre-feasibility study, and detailed feasibility study services; manufactures and distributes wood pellets; and provides torrefaction technology license. The company was formerly known as Toyo-Thai Corporation Public Company Limited and changed its name to TTCL Public Company Limited in April 2015. The company was incorporated in 1985 and is headquartered in Bangkok, Thailand. TTCL Public Company Limited is a subsidiary of Italian-Thai Development Public Company Limited.