Abstract: Renewable energy desalination plant for the treatment of a fluid includes: a treatment unit equipped with first and second reverse osmosis filtration devices for desalinating of a flow of fluid to be treated, the first and second devices being connected in parallel; first pump positioned upstream of the treatment unit; means for generating electrical energy from renewable energy to supply electricity to the first pump, a supply duct which is fluidically and separately connected with the inlet of the first device and with the inlet of the second device the treatment unit, to supply the two devices with the fluid to be treated, a shut-off/regulating valve which is positioned at the fluidic connection of said supply duct with the first device, an electronic control unit electronically connected to the shut-off/regulation valve; electronic sensors connected to the electronic control unit configured to detect irradiation and/or the intensity of electric current generated.