A system for generating electrical energy to be supplied to an equipment at a target area, for instance at an agricultural site, said system comprising: - at least one mobile robot, referred to as "collecting robot"; - a plurality of mobile robots, referred to as "producing robots"; wherein each collecting robot comprises: - at least one input port adapted for coupling with an output port of a producing robot, for receiving electrical energy thereof; - an output port for outputting electrical energy received from each producing robot coupled with the collecting robot; wherein each producing robot comprises: - a photovoltaic, PV, generator for generating electrical energy; - at least one input port adapted for coupling with an output port of another producing robot, for receiving electrical energy thereof; - at least one output port for outputting electrical energy generated by the producing robot and received from each other producing robot coupled with the producing robot; wherein at least one collecting robot and a plurality of producing robots are coupled together and the output port of the at least one collecting robot is connected to the equipment, and the collecting robot is configured to collect electrical energy from all the producing robots it is coupled with and to supply the equipment with the collected electrical energy at the target area. - at least one mobile robot, referred to as "collecting robot"; - a plurality of mobile robots, referred to as "producing robots"; wherein each collecting robot comprises: - at least one input port adapted for coupling with an output port of a producing robot, for receiving electrical energy thereof; - an output port for outputting electrical energy received from each producing robot coupled with the collecting robot; - at least one input port adapted for coupling with an output port of a producing robot, for receiving electrical energy thereof; - an output port for outputting electrical energy received from each producing robot coupled with the collecting robot; wherein each producing robot comprises: - a photovoltaic, PV, generator for generating electrical energy; - at least one input port adapted for coupling with an output port of another producing robot, for receiving electrical energy thereof; - at least one output port for outputting electrical energy generated by the producing robot and received from each other producing robot coupled with the producing robot; - a photovoltaic, PV, generator for generating electrical energy; - at least one input port adapted for coupling with an output port of another producing robot, for receiving electrical energy thereof; - at least one output port for outputting electrical energy generated by the producing robot and received from each other producing robot coupled with the producing robot; wherein at least one collecting robot and a plurality of producing robots are coupled together and the output port of the at least one collecting robot is connected to the equipment, and the collecting robot is configured to collect electrical energy from all the producing robots it is coupled with and to supply the equipment with the collected electrical energy at the target area.