Welcome to the official website of the 2015 International Conference on Renewable Energy and Environmental Engineering (ICREEE 2015), which will be held during 20-21 November 2015, in Makassar, Indonesia. This conference to provide a platform for postgraduate from all over the world to present their research results, development activities and their experiences, new ideas, and research results about all aspects of Renewable Energy and Environmental Engineering besides discuss the practical challenges encountered and the solutions adopted.