A power umbilical is shown that comprises a number of power cables (40) to transfer large amounts of electric power/energy, optionally electric wires and/or optical conductors, filler material (20, 25, 30) in the form of rigid elongated plastic elements that are located at least partially around and between the power cables (40) and the optional wires/conductors and they are collectively gathered in a twisted bundle by means of a laying operation. A protective jacket (10) encompasses the power cables (40), the optional wires/conductors, and the filler material (20, 25, 30). The power cables (40) are made of aluminium. The power cables (40), the optional wires/conductors and the filler material (20, 25, 30) are alternately laid, i.e. by continuously alternating laying direction, in the entire or part of the longitudinal extension of the power umbilical.
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