A wind turbine comprising two or more rotors

A wind turbine comprising:

• a tower structure comprising a main tower part being anchored, at a lower part, to a foundation structure, the main tower part extending along a substantially vertical direction, the tower structure further comprising at least two arms, each arm extending away from the main tower part along a direction having a horizontal component, and
• two or more rotors mounted on the tower structure in such a manner that each arm of the tower structure carries at least one rotor, each rotor comprising a hub carrying a set of wind turbine blades, the hub being mounted rotatably on the tower structure;
• a rotating shaft arranged to be connected to a generator in order to transfer rotational movements to the generator;
• and a gear arrangement arranged to transfer rotational movements of the hub to rotational movements of the rotating shaft,
• wherein the gear arrangement of at least one of the rotors comprises a number of pulleys and a number of belts interconnecting the pulleys in order to transfer rotational movements between the pulleys, thereby transferring rotational movements from the hub to the rotating shaft.