REDEC 2018 is a specific scientific conference that helps in finding innovative and adequate solutions for energy saving and production in developing countries. During the first three editions, participants from across the globe have discussed the scientific issues that were presented and subsequently published in IEEEXplore. Due to the fruitful results, the organization of REDEC2018 has added new topics on smart grids and DCmicro-grids, giving more opportunity to a wide profile of participants to present their work in the domain of renewable energy and related research.