Founded in 1990, Iljin Power specializes in maintenance and manufacturing for power generation and industrial plant equipment, organized into a Power Generation Business Division handling plant maintenance, a Nuclear Business Division covering nuclear plant maintenance and component manufacturing, and a Chemical Equipment Division producing petrochemical and plant components.
The company stations personnel at operating plants such as Hadong Thermal, Ilsan Combined Cycle, and Dangjin Thermal power stations for routine maintenance, and deploys technical staff at the Wolsong and Hanbit nuclear power plants.
Its subsidiaries include Iljin Energy, which handles chemical and plant businesses, and Jincheon Green Energy and Goyang Green Energy, which operate in the fuel cell and hydrogen segment.
In March 2024 the company established a local entity in Abu Dhabi, ILJIN POWER PLANTS MAINTENANCE LLC, to participate in maintenance work at the UAE's Barakah nuclear plant, marking a step toward overseas expansion.
The domestic power plant maintenance market is split roughly 44% for KEPCO KPS and around 56% for private operators including Iljin Power, with Geumhwa PCS, Korea Plant Service, and Susan Industry as key competitors.
In the most technically demanding large overhaul segment, KEPCO KPS still leads by job count, indicating a persistent capability gap in the highest-complexity work.
At its March 2026 annual general meeting, the company expanded its articles of incorporation to add power generation business, electricity production, supply and sales, renewable energy facility installation and operation, and plant EPC and O&M services.
This suggests an attempt to broaden the business scope beyond pure maintenance services into the wider power generation value chain. The company describes itself as a 'Green & Clean Energy' company spanning nuclear and hydro maintenance to hydrogen refueling station commissioning.