Energy efficiency is an important strategy for cities to tackle climate change. Improving efficiency in the way we use and develop urban land, in the transportation sector as well as in the design of commercial and residential buildings can help moderate global climate change while contributing to a more sustainable energy future. CEIM (Madrid Business Association) and INTA joined their efforts to organise a debate on energy efficiency and urban development focusing on two main themes: Energy as challenge and opportunity for sustainable urban development and Innovative planning as challenge and solution for sustainable cities.