The “Solar powered chlorine producing module”, “SCPM”, is a multi-purpose invention. It is designed to provide daily use of chlorine and caustic soda for water and sewer treatment plants in municipalities throughout the world. This design reduces the operating cost of water and sewer plants in such a way that the initial capital cost will be captured within a few years.This invention is designed to replace the chlorine producing plants which are expensive to build and costly to operate. They use enormous electric energy taken from already overloaded power grid.This invention eliminates transporting chlorine, which is considered hazardous material from producing plant to end users' sites. In addition to safety, it also eliminates the liquefaction and transportation cost. Currently, the chlorine end users need storage facilities for hazardous chemicals, which will be eliminated by use of the “SCPM” system.Numerous industries use chlorine in daily processing and productions. They could use this system at their own site. Unlike conventional chlorine productions that are built with constant capacity production for their entire life with high initial capital cost, this design is flexible to the chlorine needs of user facilities. A chlorine production plant with “solar powered chlorine producing modules” is flexible, expandable with minimum initial capital investment that is suitable for any chlorine consumer facility.