The renewable energy sources sector constitute a very important subject nowadays on a global level and many nations are trying to direct some investments in this field. After the pandemic strike and the conflict between Russia and Ukraine a problem that appeared was the energy crisis. Energy prices has gone up and energy poverty has risen in many countries. As an answer many countries have started trying to be energy independent, something that can happen through renewable energy sources. So, in this thesis we examine the renewable energy sources sector in the context of energy economics and the latest developments. There are many types of RES such as solar and wind energy, with a lot of room for improvement in order to tackle energy poverty. The EU Green Deal launched in 2020 has some useful instructions to offer in order to make European countries energy independent as much as possible. In this context there are also many opportunities for Greece, a country with a lot of renewable sources due to its geographic position. From the examination of some RES stations in Greece it is clear that the country should facilitate investments in this direction, because there can be many benefits from renewable energy.