This paper[0] has capex and opex costs for three types of desalination technology - multistage flashing (MSF), multi-effect distillation (MED) and reverse osmos

This paper[0] has capex and opex costs for three types of desalination technology - multistage flashing (MSF), multi-effect distillation (MED) and reverse osmosis (RO). The lowest costs are for reverse osmosis and are $113 million capex, $19 million annual opex, for a 68000 cubic meters per day plant (which is apparently a defacto standard size) with an expected lifetime of 25 years. [0] https://www.researchgate.net/publication/313461134_Long-term_desalinated_water_demand_and_investment_requirements_a_case_study_of_Riyadh https://www.researchgate.net/publication/313461134_Long-term...