From an environmental perspective, the positive aspect of this project lies in the fact that the atmospheric emissions of the SAduced due to the fact that: èèthe new structure will exclusively use gaseous fuels (natural gas and fuel gas from the adjacent ISAB refinery) which have a lower environmental impact compared with the liquids currently used in the SA1N/3 group, èèthe thermal power of the SA1N/1 group will be dedicated solely to the produc tion of steam, which is less than that of group 3, thus favouring a net reduction a continuous serVice is ensureD by Multiple proDuction centres.