The document describes an industrial plant for producing biodiesel from algae. It discusses the multi-step process including growing algae phototrophically in photobioreactors, extracting the algal oil, and converting the oil to biodiesel. Key aspects of the process include nutrient delivery and monitoring, light exposure and mixing to maximize photosynthesis, and mechanical designs to optimize the culture and extraction. The biodiesel produced can replace diesel fuel completely and meets European environmental regulations.