Apparatus (1) for additively manufacturing at least one three-dimensional object (2) by means of successive layerwise selective consolidation of layers of build material (3), the apparatus (1) comprising a number of functional devices (7-10) operable at a defined operating voltage level, whereby the apparatus (1) comprises at least one voltage control device (13) configured to change the voltage level of a supply voltage (14) supplyable or supplied to the apparatus (1) from an electrical energy supply grid (15) from a supply grid voltage level different from the defined operating voltage level of the number of functional devices (7-10) of the apparatus (1) to the or a voltage level equal to the defined operating voltage level of the number of functional devices (7-10) of the apparatus (1).