- Manufacturing, repairing, repairing equipment products, mechanical structures.

- Design, manufacture, installation and repair of pressure equipment and lifting equipment.

- Perfecting the surface of the products by hot dip galvanizing, electrolytic plating, powder coating.

- Producing electric wires, cables, composite products.

- Consulting, designing, supervising and constructing 110 KV transmission lines and transformer stations.Import and export business of materials, equipment in the fields of mechanics and electricity.

- April 22, 1987: Formerly known as Mechanical and Electrical Repair Enterprise, was established.

- 1991: Renamed as Electrical Mechanical Enterprise;

- 2005: Converted into Electrical Mechanical Joint Stock Company No 3;

- January 18, 2006: Renamed as Central Area Electrical Mechanical Joint Stock Company as a subsidiary of EVN.

- December 14, 2006: Traded on Hanoi Stock Exchange (HNX) with the charter capital of VND20 billion;

- December 14, 2017: Increased charter capital to VND40 billion.