Sao Thian-A power plant is located at Tumbol Krai Nai, Ampur Kongkrailat, Sukhothai province. The plant has generating capacity of 3.9 MW and its uses fuel gas, by-product from gas separation process of Petroleum Production Plant (PPP) and associated gas of Sao Thian-A crude oil production well of PTT Exploration and Production Public Co., Ltd, which has been granted concession from Energy Ministry in Sao Thian-A Source, Kongkrailat District, Sukhothai Province, as its fuel to produce electricity. Such electricity will be supplied to distribution and transmission system of Provincial Electricity Authority (PEA)