This service includes Engineering Services for the system installations and Maintenance Services such as periodic inspection, cleaning and greasing of porcelain insulators of high and extra-high voltage(up to 765KV) transmission lines and switchyards, and detection, replacement of defective lines and systems. The total length is 19,500 Circuit km long and the total number of Towers are 32,000.

For High Voltage Direct Current (HVDC) Lines and Convertor systems between Korean main land and Cheju island (length of 101km), KPS provides maintenance services.