The Criticality Measure of Energy Systems

National security, economic growth and population welfare depends on the safe and reliable functioning of various infrastructures very much. The disruptions in one of the infrastructures often are transferred to the other dependent infrastructures. Thus, it could have considerably negative effects for the functionality of the country's basic administration. The critical infrastructure is defined by an asset, system, part thereof or technical networks composed of different sectors. The paper presents the assessment method of critical infrastructure modelling and elements’ criticality of the energy system. The criticality of infrastructure element is described by other systems elements functionality reduction when considered element is affected by disruption or out of order. Assessment of system ability to perform its functions is implemented by authors developed model, when energy supply is interrupted or system element is out of order. In the analysed model energy sector is composed of heat and power systems. The optimization methods were used to simulate real system (to implement allocation of demands of heat and electricity for generation technologies).