Arrays of photoactive components (for instance, polynuclear transition metal complexes, and others) can be designed in view of efficient light absorption and collection of excitation energy. The physical convey of this energy to a precise component unit of a supermolecule may open the way to its subsequent transport along modular, linearly arranged fragments, prior to final utilization of the stored energy. The step of vectorial energy transfer in molecular wires takes place with rates and efficiencies which are dictated by the electronic nature of the component modules. These wires (polyphenylenes, polythiophenes, and others) allow transfer of energy according to different types of mechanisms which are examined and studied in detail, in view of optimisation procedures.