What is sustainable economy? Its a branch of economy development based on sustainable development concept. The planetary resources and nature must be protected and used in a rational and planned way in space and time. This economy hopes that society development will be achivied in total respect of the sustainable concept from the social, economic and enviromental point of view. 5 article: unrenewable resources of Earth must be used in a particular way to avoid their exhausting and in such a way that the advantages from their use will be shared by everybody. Its impossible to explain in a limited time what sustainable economy is and its components, so we have chosen few topics: 3 article: Earth capacity to produce essential renewable resources must be preserved and, if is possible, re-established and improved. INTRODUCTION, by Nicola Mannu. PHOTOVOLTAIC, by Aicha Benbiga, Silvano Pais, Marco Marginesu, Giulia Cirotto. EOLIC ENERGY, by Valerio Sau, Luca Gatto Ronchieri and Daniel Pintus. DOMOTICS, by Alessandro Sassu and Alex Capitelli. PHOTOVOLTAIC PRATICAL APPLICATION, by Francisco Gago Byron Andrade