BANGKOK: State-owned Electricity Generating Authority of Thailand has narrowed its list of potential liquefied natural gas sources to 12 companies, for importing up to 1.5 million metric tonnes per annum for the first time as the government liberalizes the energy sector to boost competition.

Thailand's largest power producer, EGAT, expects to finalize purchasing agreements by June and begin liquefied natural gas (LNG) shipments by September this year, EGAT Director Viboon Rerksirathai said.

EGAT buys gas from a state-owned unit of PTT Pcl, which is the nation's sole gas supplier and LNG importer.

The move comes as Thailand joins other Asian countries such as China where LNG imports have risen exponentially over the past few years, driven by strong economic growth and a push for cleaner air.

Of the dozen companies, which include, Qatargas, Shell and Total SA, EGAT would select the firm that offers the lowest price.

The LNG imports would be via Thailand's existing Map Ta Phut LNG Receiving Terminal in the east of the country.

Other firms being considered are Chevron Corp, Malaysia's Petronas, and Japan's Marubeni Corp.