SUSTEPS project is an ambitious initiative dedicated to the sustainable production of advanced biofuels, particularly aviation fuels, from microalgae. The project seeks to revolutionize renewable fuel technologies by advancing every step of the microalgae-based biofuels (jet fuel, renewable diesel) value chain. At its core, SUSTEPS aims to develop technologies that meet the market standards for replacing fossil fuels in the transport sector. SUSTEPS proposes a bio-refinery concept where microalgae-based biofuel is produced with the introduction of several elements oriented towards sustainability and cost efficiency like flue-gas sourced carbon dioxide (CO2) fixation via microalgae fed with wastewater, integrating green hydrogen, valorizing aqueous side-streams.