Sombat Sarntijaree

PTT Chemical Public Co. Ltd. is engaged in the production and distribution of Ethylene, Propylene and Polyethylene. The company's by products are Mixed C4, Pyrolysis gasoline, Cracker bottom and tail gas. PTT Chemical is also involved with the production and distribution of electricity, water, stream, and other utilities. It operates production support facilities such as jetty and buffer tank farm services for liquid chemical, oil and gas. The company was founded December 7, 2005 and is headquartered in Bangkok, Thailand

EGAT Diamond Service Co. Ltd. provides gas turbine refurbishment services. It offers repair of components such as combustor basket, transition piece, turbine bland, and turbine vane. The company was founded in December 2009 and is headquartered in Pathum Thani, Thailand.

Ratchaburi Power Co., Ltd. engages in generation and production of electricity. The company operates as a gas fired combined-cycle plant. Ratchaburi Power was founded in 1996 and is headquartered in Bangkok, Thailand.

Electricity Generating Authority of Thailand engages in the generation, procurement, transmission, and distribution of electricity. It also offers electricity related engineering, construction, maintenance, and consulting services. The company was founded on May 1, 1969 and is headquartered in Nonthaburi, Thailand.