We would like to warmly invite you to the ICAE2013, the Fifth International Conference on Applied Energy, and to Pretoria (described words ancient and beautiful) , South Africa. ICAE has grown substantially after the successful conferences in Hong Kong (2009), Singapore (2010), and Italy (2011), China (2012) firmly established as the one of the premier international forums in all areas of energy. Same as the post ICAE conferences, the ICAE2013, powered by the international journal, Applied Energy, seeks to showcase what is new and exciting in energy research and development that offer opportunities for translation into sustainable solutions. With “Energy innovations for a sustainable world” being the theme, major topics of the ICAE 2013 include renewable and green energy resources, advanced energy technologies, energy conservation in buildings, energy systems, environment and climate change in both technology and policy issues. Participants of the ICAE 2013 are kindly encouraged to submit papers, which will be reviewed and accepted for presentation orally or by poster in the conference. Selected papers from the conference will be recommended by the scientific committee for further consideration of publication in prestigious journals including Applied Energy, and other renowned international journals. Awards for best papers will be evaluated and announced by the scientific committee in the next year’s ICAE conference. Pretoria, the host city of ICAE2013, is the political capital of South Africa and is 50 km away from Johannesburg. Attractions of Pretoria include the Union Buildings for South African presidency, the Botanical Gardens, National Zoological Gardens, Wonderboom Nature Reserves, and many museums and galleries. Post conference tours bring you to the most fantastic sites such as Cape Town and the Kruger National Park. We look forward to meeting you in ICAE 2013 at Pretoria!