It is a truth universally acknowledged that we are living in a very important period in the area of climate change. The effects of greenhouse gas emissions and pollutants are manifesting themselves with greater frequency and intensity than ever before, and as a result, the world is moving in a more environmentally sustainable direction. This implies that the aviation sector is also studying solutions to reduce greenhouse gases. The aim of this thesis is to show the reader the reliability aspect of new turbo-electric and turbo-hybrid architectures, as well as the current state of the art of such technologies that various companies and universities are studying and developing.