The Saudi Water Authority (SWA) revealed on November 2, 2026 that it is launching a microalgae cultivation project in Rabigh that will harness desalination brine and CO₂ emissions to create bio‑based products. The initiative, managed by the Water Technologies Innovation Institute and Research Advancements (WTIIRA), aims to transform waste outputs from desalination plants into commercial goods for animal and fish feed, biofertilizers, and pharmaceutical and cosmetic ingredients.
Project Implementation and Goals
The venture is designed to produce 60 tons of microalgae each year, designated primarily for developing animal and fish feed. In addition, the SWA plans to generate 8,000 cubic metres of biofertilizer and 20 kilograms of raw materials suitable for pharmaceutical and cosmetic applications annually. These volumes were cited by the Royal Saudi Press Agency as the key production targets for the first operational year of the project.
WTIIRA is testing both open and closed cultivation systems to identify the most efficient means of extracting biomass from brine streams. The agency is also assessing how to best integrate CO₂ emissions from associated desalination facilities into the photosynthetic process. According to the SPA release, these studies will inform decisions about scaling and the potential commercialization of the produced materials.
Operational Details and Sustainability
The project’s primary site will be the Water Innovation Oasis in Rabigh, a dedicated complex intended to host experimental and industrial microalgae cultivation units. WTIIRA intends to evaluate the technical performance of each cultivation system, including growth rates, nutrient uptake, and product purity, while simultaneously measuring economic feasibility in terms of capital and operating costs versus projected revenue streams.
Saudi authorities emphasize that the microalgae project aligns with Vision 2030’s objectives to diversify the economy, expand local bio‑based industries, and create new investment opportunities. By converting desalination by‑products into high‑value goods, the initiative seeks to reduce carbon emissions, increase the environmental sustainability of water treatment infrastructure, and promote resource‐use efficiency. The SPA noted that the project’s circular economy approach could serve as a template for similar efforts throughout the kingdom.
Current statements from the SWA emphasize that the project remains in the developmental stage. While the agency outlines clear production targets and plans for industrial scaling, it acknowledges that the economic and technical viability of converting brine streams at the magnitude proposed has yet to be fully proven. The SPA therefore underscored that further research and pilot‑scale results will be necessary to confirm the feasibility of the initiative.
In addition to animal feed and biofertilizer output, the SWA stresses that 20 kilograms of pharmaceutical and cosmetic ingredients per year provides an encouraging demonstration of the versatility of microalgae-derived compounds. However, no specific product lines, market partners, or clinical trials have been announced to date, leaving the commercial integration of these ingredients uncertain.
While the SWA envisions broad environmental and economic benefits, the SPA highlights several areas of concern that remain unverified. Technical performance metrics from pilot runs, the efficiency of CO₂ capture, the stability of microalgae strains in saline conditions, and the overall carbon footprint reduction of the process have all yet to be quantified extensively. Economic feasibility analyses covering cost of brine digestion, system maintenance, and market pricing for the produced feed, fertilizer, and ingredients are still under construction.
The SWA’s announcement therefore provides a clear framework for the next phases of the project but also leaves unresolved questions about how the initiative will operate at scale, how it will integrate into existing industrial ecosystems, and whether it will realize the projected logistical and financial milestones. Only forthcoming pilot‑scale results and economic assessments will be able to answer these questions definitively.
