A wind turbine system comprising: a plurality of modules, each module comprising a frame and at least one wind turbine supported by the frame; a set of first electrically conductive members (4a, 4b); and a set of second electrically conductive members (5a, 5b); Z f wherein one of the first electrically conductive members is attached to a terminal of a generator of the at least one turbine and another of the first electrically conductive members is attached to another terminal of the generator such that the set of first electrically conductive members (4a, 4b) forms a collection circuit which is configured to collect electricity generated by the turbine; wherein the set of second electrically conductive members (5a, 5b) are connected to the set of second electrically conductive members (5a, 5b) of adjacent modules to form a concatenated string of second electrically conductive members (5a, 5b) which form a transmission circuit; wherein the set of first electrically conductive members (4a, 4b) are connected to the set of second electrically conductive members (5a, 5b) so as to feed the collected electricity from the collection circuit to the transmission circuit for transmission along the concatenated string of second electrically conductive members; wherein at least one of the first electrically conductive members (4a, 4b) and at least one of the second electrically conductive members (5a, 5b) form structural rails of the frame which supports the at least one turbine, and wherein, in use, the collection circuit and the transmission circuit carry different types of current and/or different voltages. a plurality of modules, each module comprising a frame and at least one wind turbine supported by the frame; a set of first electrically conductive members (4a, 4b); and a set of second electrically conductive members (5a, 5b); Z f wherein one of the first electrically conductive members is attached to a terminal of a generator of the at least one turbine and another of the first electrically conductive members is attached to another terminal of the generator such that the set of first electrically conductive members (4a, 4b) forms a collection circuit which is configured to collect electricity generated by the turbine; wherein the set of second electrically conductive members (5a, 5b) are connected to the set of second electrically conductive members (5a, 5b) of adjacent modules to form a concatenated string of second electrically conductive members (5a, 5b) which form a transmission circuit; wherein the set of first electrically conductive members (4a, 4b) are connected to the set of second electrically conductive members (5a, 5b) so as to feed the collected electricity from the collection circuit to the transmission circuit for transmission along the concatenated string of second electrically conductive members; wherein at least one of the first electrically conductive members (4a, 4b) and at least one of the second electrically conductive members (5a, 5b) form structural rails of the frame which supports the at least one turbine, and wherein, in use, the collection circuit and the transmission circuit carry different types of current and/or different voltages.