PTT Public Company Limited or simply PTT is a Thai state-owned SET-listed oil and gas company. Formerly known as the Petroleum Authority of Thailand, it owns extensive submarine gas pipelines in the Gulf of Thailand, a network of LPG terminals throughout the kingdom, and is involved in electricity generation, petrochemical products, oil and gas exploration and production, and gasoline retailing businesses. Affiliated companies include PTT Exploration and Production, PTT Global Chemical, PTT Asia Pacific Mining, and PTT Green Energy.