A solar-driven apparatus is provided having: a cavity having at least one optical window for collecting electromagnetic radiation associated with solar energy impinging on said at least one optical window; a reaction assembly located inside the cavity and adapted to enable carrying out electrolysis process of at least one raw fluid utilizing energy derived partially from the solar radiation and partially from an electric source; one or more ingress units operative to allow introduction of the raw fluid into the apparatus; and one or more egress units operative to allow exit of the electrolysis process' products from the solar driven apparatus.