In the past the business unit focused on sales & services of Diesel Engines and Diesel Generating sets. The unit represented Volvo Penta Engines from Sweden and FG Wilson generator sets from the United Kingdom. Besides Conventional Diesel Generators, it also offers special generators for railway car, aircraft services and military purpose.

In the year 2000, the business unit introduced locally assembled “Italthai Genset” fabricated at the company's Mahachai plant, using Volvo engines and Leroy Somers generators as the main components. These locally fabricated generating sets are now the fastest growing sector of the division.

Some of the genset customers are BTS sky train mass transit, MRTA underground mass transit, TOT communication system and Suvarnabhumi International Airport.