The given investigation considers the peculiarities of decentralized power supply, taking into account specific features of North and Arctic Territories. Aautonomous systems of power supply (ASPS) operate in the regions of the Far North under the most difficult circumstances. This set of territorial factors reflecting the peculiar features of geographical location and situational factors group of autonomous power. Multi-factor approach and complexity of the power problems in modern decentralized energy puts forward ES as the most important component of regions national security. The degree of large differences between Northern and power isolated regions from other territories confirms the need for methodological approaches to the diagnosis. A priori some indicators have their value and the inherited threatening group can complicate in terms of infrastructural isolation and severity of the climate for the functioning of power generation and functioning within quite different types of consumers. Structuralization of the maximum peculiar threats of different nature and the main consequences for ES investigated parts allows formulating a common definition for the exclusively decentralized zones of severe climate conditions territories. Due to the context of autonomy the clear boundaries of concepts of threshold ES states of the researched systems are appropriate: secure, depressive, emergency.