QTC Energy (Public) Company Limited, formerly known as Quality Transformer Company Limited, was established on July 19, 1996, with an initial registered capital of 10 million Baht, to operate the business of producing and distributing distribution transformers.

In July, 2003, the Company changed its name to Q.T.C. Transformer Company Limited. On August 19, 2010, it was transformed into a public limited company and changed its name to QTC Energy (Public) Company Limited and was listed on MAI Stock Exchange on July 28, 2011. Transferred its securities for trading on the Stock Exchange of Thailand (SET) on July 29, 2021. Mr. Poonphiphat Tanthanasin was the founder of the Company who has over 47 years of work experiences in the transformer manufacturing industry. He has worked with major and leading transformer manufacturers in the country and been responsible for various works, including design, assembly, and production as well as sales and marketing. He has intensive and comprehensive knowledge and expertise in transformers in all areas. In addition, the management team, engineers, and employees are knowledgeable, experienced, and expertise in the transformer business for more than 47 years. They had been trained by leading transformer manufacturers for a long time in Germany and Japan. Such experiences enable them to help the Company to develop high quality transformers that are widely accepted by customers, including state-enterprise electricity agencies, i.e. Metropolitan Electricity Authority, Provincial Electricity Authority, and domestic and international private customers.

Over the past years, the Company has continuously developed transformer products which have been accredited by various standards, such as TIS 384-2543 from Thai Industrial Standards Institute, Ministry of Industry, ISO 9001: 2015 standard for the design, production, and maintenance of distribution transformers, and many other standards. In addition, the Company is able to produce quality transformers according to international standards, thus it can prove the international quality of transformers produced by QTC.

The details of significant company developments in the past are as follows: