Humans have been in need of energy sources since they settled down, and the need for more energy has emerged with the industrial revolutions. These needs have brought with them wars and the order of exploitation. When we look at it in a global context, hegemony and energy have a direct connection with each other. States that want to be a global power must have limited energy resources for unlimited production. For this reason, `energy` has been among the main causes of wars throughout history. Meeting the energy needs that started with coal, and followed by oil and natural gas, new energy sources that have changed with the developing technology have emerged. Although a significant part of the world`s electricity production (40%) is still carried out with coal today, convertible energy sources have also been added. Energy types such as water, solar, wind and nuclear (renewable energy resources) have taken their place in this transformation and new policies have been determined in the struggle against climate change. With the title of "Global Energy And Geopolitical Transformation" this book study aims to examine the transformation of energy and security concerns by focusing on regional and thematic issues within the contemporary world.