State of the art on renewable and sustainable energy

In this special issue on renewable and sustainable energy concerns with latest developments related to sustainable and renewable energy. In this editorial introduction, the editor is highlighting the different articles presented and discussed in this issue. This issue will introduce the main development in: PV and Solar Energy, Wind Energy, Hydrogen and Fuel Cell, Energy Efficiency, ECO Design and Energy and Environment Planning and Management. The contents of this issue will be discussed in details in the following sections.