The advances on the technology sector bring more and more changes in our everyday lives, sometimes without ever being noticed. All the sectors of the economy have experienced great changes over the last 10 years due to the progression of the technology, thus affecting the way every business functions. Technology advances have changed our lives and are expected to do this in a faster and more dynamic way. Under these circumstances, technology developments are available to everyone, not only to use them, but also to advance them. Changes are not made only by big companies, but also from anyone who may have a revolutionary idea. This has resulted in many recent developments, which have created a breakthrough and revolutions in technologies available to everyone. Such a result is the creation of the Blockchain technology in 2009. It has been described as a revolution because it changes everyday operations of businesses, banks, public sector and many more who adopt this technology. This thesis deals with the Blockchain technology across the globe and how it can be implemented in the energy sector. Since it is a brand-new idea, the adoption of this technology has occurred in a small scale in energy, however, it is expected to grow the area of adjustment. In the first chapter, a theoretical approach of the Blockchain is presented, while in the second chapter I will describe in which cases the application of Blockchain is possible in the energy sector. Furthermore, there will be a brief presentation of some projects that deal with this technology and what their activities and goals are. Certain experiments will also be presented in this paper; while big companies such as Shell and IBM are trying to investigate which is the best way to implement it. Analysing the benefits, that can be derived from it, it is essential to understand the issue of the Blockchain in the energy sector. However, there are some changes that need to be done in the regulations for example, so that this technology can be adopted without restrictions. Finally, this paper closes with a discussion and a conclusion on the benefits from this new technology and some recommendations.