PROBLEM TO BE SOLVED: To provide a unit start method for electric power plant enabling auxiliary steam required at the time of starting-up of a power generation unit to be assured at No.2 plant boiler.SOLUTION: This invention includes a first stage before starting-up to perform stopping of a boiler soot blow and stopping of a water demineralizer in order to start a power generation unit by No.2 plant boiler HB, a second stage for performing a condensed water clean-up, a third stage for performing a clean-up of a deaerator, a fourth stage for preparing a boiler ignition, and a fifth stage for igniting the boiler and increasing its temperature. At the second stage, B*C tank yard bottom surface heating steam master valve is closed after starting the clean-up. At the third stage, after starting the clean-up for the deaerator, a flow rate of steam of the plant boiler is reduced by a pressure adjustment valve PCV-502-1 in the deaerator, and after this operation, the flow rate of steam in the plant boiler is reduced by a high pressure turbine worming valve AS-12V and at the fourth stage, the flow rate of steam in the plant boiler is reduced by temperature adjustment valves TCV-005A, TCV-005B for a steam type air-preheater unit.SELECTED DRAWING: Figure 3
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