PTT Natural Gas Distribution Co (PTT NGD), a PTT Plc subsidiary, expects sales to grow by 5% next year to 8.4 billion baht, thanks to steady expansion of the industrial sector.
The country's sole industrial natural-gas distributor also projects sales volume growth of 5% to 85 million standard cubic feet per day (MMSCFD) in 2014 from 80 MMSCFD this year.
Paspong Sangprueksa, vice-president for marketing and sales, said companies in the automotive, textile, glass, food-processing and rubber sectors are now expanding capacities to serve demand at home and overseas.
Though the company expects the number of customers to be on par with this year at 300, each has increased its capacity and will use more gas, he said.
He added most of the clients are in the central region.
Mr Paspong said the company has approached potential customers along PTT's new gas pipelines.
With a total investment 250 billion baht from 2012 to 2016, the fourth phase of the gas pipelines runs to Nakhon Sawan to the North, Hua Hin to the south and Nakhon Ratchasima to the northeast.
Termchai Bunnak, PTT executive vice-president, said PTT NGD's joint venture with Amata Corporation, Thailand's leading industrial estate operator, would campaign for usage in overseas markets such as Myanmar and Vietnam.
Prasert Bunsumpun, chairman of the board of PTT Global Chemical Plc, said the government's 2.2-trillion-baht infrastructure investment programme would increase power demand by 4,800 megawatts to run the planned four high-speed and 10 mass-transit rail lines.
Total power generation capacity is expected to more than double to 70,000 MW in 2030 from 33,000 MW at present.
Gas will play a significant role in feeding rail logistics, added Mr Prasert.
But Payungsak Chartsutthipol, chairman of the Federation of Thai Industries (FTI), said Thailand would use energy more efficiently when the planned infrastructure projects are in place.
The FTI reported that road transport costs around 1.7 baht per kilometre per tonne compared with 0.93 baht shipped on rail and 0.64 baht by sea.
Thailand's competitiveness will be enhanced as logistics costs would be cut down from 15% of gross domestic products (GDP) at present to 13% although it remains high compared with 8-9% in developed countries. GDP growth, meanwhile, would get a one-percentage-point boost from the massive investments.