PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of reducing power consumption and a power consumption reduction method.;SOLUTION: An image forming apparatus comprises a first printer part, a second printer part, a heating part and a control part. The first printer part forms an image on a sheet with decoloring toner decolorable by heating. The second printer part forms an image on a sheet with non-decolorable non-decoloring toner. The heating part heats the sheet on which the image has been formed. The control part controls an operation in an own apparatus on the basis of a power amount as an integrated value of power consumption within a predetermined period.;SELECTED DRAWING: Figure 4;COPYRIGHT: (C)2019,JPO&INPIT
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