An ultra-supercritical 1 000 MW double-reheat power plant is taken as an example to establish the thermal economic model and techno economic model. The effects of the load

main steam parameters and reheat steam parameters on thermal economy of the double-reheat unit are examined. Moreover

the influences of the operating hours

unit efficiency and fuel price on the cost of power generation are studied. The results show that

the thermal efficiency variation of the double-reheat unit caused by load change is larger than that of a single reheat unit. The effects of the main steam parameters on the thermal economy are negligible. Where as the reheat steam parameter considerably influences the thermal economy. In addition

the cost of power generation increases with the decreasing operation hours and unit efficiency. Furthermore

the cost of power generation for double-reheat unit is higher than that of a single reheat unit when the operating hours reduces under the condition of low efficiency. It means that the technology economy of double-reheat unit has a great advantage under condition with high flue prices.