Abstract: CO₂ capture and storage （CCS） technology is one of the actively exploring ways to reduce carbon emissions and achieve carbon neutrality goals fossil energy enterprises. Based on the actual unit data of the coal-fired power plants of Huaneng Group, the technical economy and development potential of CCS of coal-fired power plants were quantitatively evaluated using an enterprise-scale CCS source-sink matching system evaluation model optimized based on the characteristics of Huaneng Group. The model integrates the methods of enterprise emission source screening, CO₂ geological utilization and storage site assessment, full-chains CCUS technical and economic assessment, source-sink matching, etc. The technical and cost parameters of the full-chains CCS, the characteristics of coal-fired power units, the performance of CO₂ storage sites, and pipe networks planning were considered, which can answer the problems of coal-fired power units with CCS retrofitting that are of special concern to enterprise managers, decision-makers and investors. With the existing technology level, only CO₂- enhanced water recovery technology (CO₂−EWR), 250 km matching distance, and 85% capture rate scenarios were considered. The CCS technology of the enterprise is feasible and contributes significantly to emission reduction. About 82% of the installed capacity of the enterprise is suitable for CCS, cumulative CO₂ emission reduction is more than 264 Mt/a, and CO₂ emission intensity is 135 g/(kW·h). The cost of full-chains CCS in the enterprise is controllable. The levelized net emission reduction cost of coal-fired power is 384 yuan/t, and the average levelized additional cost of electricity is 332 yuan/(MW·h). The low-cost CCS projects of Huaneng coal-fired power plants are mainly distributed in Ordos, Bohai Bay, Erlian, Songliao, and Subei Basin. Detailed technical and economic evaluations have been carried out for the CCS retrofitting of typical coal-fired power plants in these areas, which can provide a reference for early demonstration projects. Considering technological advances and CCS-hub, EWR costs for coal-fired power can be drastically reduced. Coal-based enterprises can prioritize deploying low-cost CO₂-EWR demonstration projects, achieving breakthroughs in key technologies and then set up demonstrations and forming full-chains integrated systems and CCS-hub in the future. Research findings provide a basis for coal-based enterprises to reduce large-scale emissions and develop low-carbon transformation through CCS technology.