Low grade heat driven multi-effect distillation (MED) desalination is a very promising environmentally friendly, low emission technology.Many countries, such as Australia, are water short and conventional desalination technology is energy intensive.If primary fossil fuel source is used, then desalination will significantly contribute to carbon dioxide emission.Low grade waste heat from process plants and power plants generate minimal carbon dioxide.This source of energy is typically abundant at a typical temperature around 65-90 ℃, and dovetails with the MED technology.In this paper, we report on a new MED technology that couples perfectly with the nature of low grade waste heat so that at least 25% freshwater yield improvement compared with conventional MED design is possible.Typical applications and their expected improvement will also be reported.