Keywords: Algal Biodiesel, Source of Energy, energy requirement, renewable biofuel

One of the major problems that the world is facing is dependence of fossil fuels for our day to day energy requirement. The increasing use of fossil fuel directly relates the global warming issues due to increased greenhouse gas emissions. Due to high dependence and usage of this fuel, a decline in its availability is being observed; hence it is necessary to look for alternative fuels. Biodiesel from microalgae seem to be most promising renewable biofuel that has the potential to completely displace petroleum derived transport fuel without adversely affecting supply of food and others crops products. Oil productivity of many microalgae greatly exceeds the oil productivity of the best producing oil crops. The present review covers about the potential of microalgae, algal culture techniques, lipid extraction methods for making algal biodiesel and economic challenges [1-4]