The question of energy becomes everyday problem in the world. Today's world and its development depend on the energies that are related to the space in which they are located. Tourist destinations are great consumers of final energy and have the ability to produce renewable energy. Today the main objective of the energy policy of the European Union and one of the most important tasks for the Republic of Croatia has been development of use of renewable energy sources, especially wind, watercourse, solar and biomass energy. Destinations create sustainable tourism and environmental protection through the participation of renewable energy sources in energy production. The future development of the energy sector will be based on increased use of renewable energy sources, increased energy efficiency and sustainable development. In order to reach the desired sustainable tourism, one must be prepared for a lasting process that requires continuous monitoring of the effects, taking the necessary preventative and / or corrective measures, if necessary. The aim of this paper is to present the importance of the concept of sustainability and application of renewable energy sources in tourist offer. Namely, it is necessary to respect the sustainability and nature protection that may contribute to making the concept of a new tourist offer completely independent of the energy products used in most enterprises. Despite the positive shift, there are still not enough financial incentives and information on the importance of renewable energy sources, so it is very important to promote sustainable tourism in the future. Since sustainability and renewable energy sources are the basic prerequisites for the development of tourism in the future, it is essential to strive for their full realization. This can only be achieved through the active implementation of the existing regulations and by joint work and informed participation of all relevant stakeholders with strong political leadership (state institutions, local self-government, non-governmental organizations and society as a whole).