Global warming, and the resulting climate change, are accepted as undisputed facts by now, even if they are, often, underestimated. The increasing greenhouse gases emissions have been implicated as the main cause of global warming, so the energy sector can play a crucial role in confining it. The environment is asking to make big changes in the way we produce most of the energy we consume, shifting to a cleaner power generation portfolio. The recent improvements and results achieved with renewable sources are astonishing but it is still not enough.