Global warming and resources scarcity have been still the main issues that have been addressed nowadays in both, economical and scientific conferences, and meetings. Therefore, industrial activities and engineering communities start a new era of energy-efficient uses. Conventional energy sources such as coal and natural gas are huge contributors to climate change. Reliance on conventional energy sources exposes consumers to price fluctuations and harms our health and environment. The world has witnessed a significant shift towards the use of renewable energy resources over the past couple of decades due to the reason of continuous depletion of fossil fuels. Renewable energy is the way to reliable and clean power. It gives significant advantages for the climate, health, and economy. Wind and solar energy need no water to operate and hence do not pollute water. In contrast, conventional sources can have a substantial impact on water resources. Energy efficiency is also essential to combat climate change. It is one of the easiest and most cost-effective ways to combat climate change. 

We cordially invite you to submit your original contributions to this Special Issue, entitled: "Energy Efficiency and Renewable Energy". The present Special Issue aims to collect innovative solutions and experimental research supported by appropriate modeling and design, but also state-of-the-art studies, in the following topics: 

Please refer to the Editorial Process and Article Processing Charge for more information about manuscript process and publishing fees.