By deeply engaging in the upgrading business of thermal power units, HHI has cultivated a highly specialized and experienced team in R&D and project execution of the field. The team has obtained extensive experiences and technical advantages in terms of power plant thermal system optimization, steam turbine flow passage retrofit and safe operation under low-load, boiler air-flue gas system optimization and low-load stable combustion, peak cooling for air-cooling system, and heating system upgrades. HHI has successfully completed energy efficiency enhancements and flexibility retrofits for a number of 300MW and 600MW thermal power units.