The 6th International conference on Energy and Sustainability will be reconvened at the Universidad Pontificia Bolivariana in Medellin. The University is named in honour of the South American Liberator Simon Bolivar.The meeting follows the success of previous conferences started in the New Forest, UK, home of the Wessex Institute (2007); followed by a second in Bologna (2009); the third in Alicante (2011); the fourth in Bucharest (2013) and the fifth in Kuala Lumpur (2014).The choice of Medellin responded to existing contacts between the Universidad Pontificia Bolivariana and the Wessex Institute, and the dynamism and rapid growth of research in Colombia. A significant part of that research focuses on energy matters and the need to respond to the modern world’s dependency on conventional fuels. The world economy is fuelled by energy. Resources depletion and severe environmental effect resulting from the continuous use of fossil fuels has motivated an increasing amount of interest in renewable energy resources and the search for sustainable energy policies.