When we talk about the green revolution, we speak of the awareness and someone’s responsibility to protect the environment, this dates from 1980s, when the green issues started to become important. The earth is 4 billion years old, whereas the man has only been around for 200 million years. However, we have squeezed all the natural resources without worrying about the consequences. Nowadays, we can observe that since the industrial revolution, world energy consumption has grown steadily, and this has led to catastrophic incidents such as Chernobyl, oil spill from oil rigs or global warming. With this historical background, it is therefore clear that we have entered to another revolutionary stage, that of clean energy. Renewable energies are increasing access to basic energy services in even the most remote areas, including heating, lighting and communications. Water pumping, wind turbines, micro hydro powered and biomass-based systems, solar pumps, hybrid mini-grids, and othe...