The first Australian cloud seeding experiment was conducted by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) in February 1947. In a spectacular demonstration near Bathurst in New South Wales, a single cumulus cloud seeded with 225 kg of dry ice produced an average of 13 mm of rain over an area of about 130 Ian2 while neighbouring clouds produced none. The Hydro-Electric Commission of Tasmania (HECT) first became involved with cloud seeding in 1964, jointly sponsoring a 5-year experiment with CSIRO which resulted in a statistically significant rainfall increase of about 23%. Recent discoveries In the field of atmospheric physics have prompted a re-analysis of CSIRO's early cloud seeding experiments with startling results. Some of their efforts including the New England Experiment, appear to have been far more successful at putting extra rain on the ground than at first thought Three separate cloud seeding projects sponsored by HECT in Tasmania spanning 14 years, have contributed further to our understanding and have confirmed that cloud seeding can routinely enhance runoff into Tasmanian storages by 10 - 20%.