The paper is dedicated to advancing the security of energy systems and conditions for undisturbed use of all types of energy. As the beginning of the 21st century was marked by various threats, challenges and risks that disrupted both integral and human security by the emergence of all kinds of violence, especially contemporary (urban) terrorism, a need has arisen for a preventive action of the UN, the nations, and their institutions for the protection of basic human rights and freedoms of citizens globally. As energy is a source of life, without which it is impossible for the modern man to function, the terrorist organizations are most likely to choose, as a target of their attacks, a range of power plants, energy transmission lines, power stations and substations in urban areas in particular, in order to cause fear, anxiety, defeatism, and panic in citizens, while compromising the nation with the international community incurring significant material damage, primarily for political reasons. Therefore, this paper points to and warns of potential problems, but also of the ways of preventive actions and the preclusion of terrorist attacks against energy systems, the energy itself, and consequently the man.