The latest trend, which is increasingly being praised by politicians and also by the media and is massively supported by mass environmental demonstrations, is the use of renewable energy sources and, consequently, the care for our environment. Renewable energy sources are only now setting a new trend in society, though they have been among us for many years. There are many types of renewable energy sources, from wind energy all the way to geothermal energy. Neutral energy sources include fusion energy and atomic energy, where CO2 emissions are neutral. Renewable energy sources are most often used for electricity production, and are consequently tied to a decentralized energy system. Despite legal efforts in the EU to expand the decentralization of electricity, it is evolving slowly. Slovenia entered the world of decentralization in 2018, when a private company introduced the electricity market to the public. The SunContract electricity market enables the purchase of electricity directly from the producer and does not include an intermediary, and it is at the same time possible to buy electricity produced exclusively from renewable energy sources in this market. Its background workings include blockchain technology, which means that users can monitor and track every transaction. Simply put, blockchain technology prevents fraud and brings transparency to the energy sector as well.