This Energy stability and security in the world have become important issues in almost every country. These are very important for the economic, social and economic development of each country. Getting energy is crucial for the development of any country, whether it comes to its industry or the economy. The paper presents the development and implementation of renewable energy sources, such as wind-power, solar energy, small hydro and biomass, both in the world and the EU. It elaborates and portrays an increasing trend of renewable energy sources in the total share of energy production, with the trend of reducing fossil fuels in energy production. The paper shows the trend of investments in renewable energy sources, with the trend of opening work posts and employment of workers who are working on the implementation of renewable energy sources, with a special emphasis on solar energy. We analyze the capacity to generate solar energy in the world for the period 2005-2015, as well as in the countries in which solar energy is used the most.