Abstract The need to transfer some civil engineering works to an underground location has been apparent in Europe since 1900. However, it is only recently that this need has also been expressed within the context of urgent national needs such as available sites, environmental protection, national safety, and economic evaluations. With regard to the generation of nuclear power, the possibility of building nuclear powerhouses underground is a satisfactory guarantee against accidents involving human beings. In addition, it must be pointed out that due to improved working methods, as well as the development of new technologies, even the financial costs of constructing underground power plants have been considerably reduced. A geological and geomechanical outline for placing nuclear powerhouses underground is suggested herein. Based on this outline, a specialized team of experts could develop the design specifications for a given nuclear plant.