Born under the sun of the Indian Ocean, Reuniwatt is a leading actor in cloud and radiation information for renewable energies and atmospheric sciences. Building on constant investments in R&D, Reuniwatt has succeeded in merging atmospheric knowledge and data sciences. They combine visible and patented infrared all sky imagers, AI techniques, live satellite data, and physical and statistical modeling techniques to offer reliable and accurate products and services. Available at all scales, they are used by various research and operational actors including atmospheric scientists, met forecasters and renewable energy industrials.