Resumen: Due to the growing demand for energy worldwide and the need to reduce greenhouse gas emissions, it is necessary to investigate new sources of energy. One of these sources is nuclear fusion technology. On nuclear fusion, a large amount of research is being carried out in small reactors in order to build DEMO in the future, the first fusion power plant with the capacity to produce electrical energy. For the operation of this plant, a series of energy requirements will be necessary. These requirements will have high powers during very low times that it is impossible for them to be provided by the network. Mainly it will be necessary power peaks to feed the magnetic field system and the heating system. To provide this energy it is necessary to use some type of storage system. And among all these systems the most suitable is the use of supercapcitors. These supercapacitors are relatively new systems that allow a large amount of power to be delivered. Also, if the current trend is continued, in a few years new technologies will be developed that will improve the characteristics of these supercapcitors. This makes it the most efficient alternative to make DEMO work possible and prove that nuclear fusion energy can be the future of energy.