Nowadays, we cannot imagine life without electricity. Although we take it for granted as a part of our lives we do not always realize how demanding it is to be produced and supplied by power plants directly to our homes. The transmission and distribution network is a highly complex system of lines of interconnecting electric energy sources, transformer stations and consumers. Unfortunately, failures can occur within electricity networks that can lead to electricity breakdowns as well as destructive fires. A UAV (drone) with a thermal imaging system installed can be a very useful tool to prevent such problems.