This article presents the results of an analysis performed in order to determine the feasibility of integrating the generation of wind power plants into the electric power system of the Republic of Croatia and their connection to the existing transmission network, for the purpose of providing a basis for the HEP Transmission System Operator (HEP Operator prijenosnog sustava d.o.o.) to establish the upper limits for the construction of wind power plants of 360 MW, which the system is currently capable of integrating.

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The work examines the problem of the aging of transmission network units and the impact of it on the reliability of the electric power system (EPS). The criteria and methodology are defined for compiling a priority list for the revitalization of lines and transformers in transmission networks. The criteria are based on the real condition of a unit and the role and relevancy of the unit within the EPS. Through a probabilistic simulation and a multi-scenario analysis the expected annual operating costs of the system are calculated. Based on the difference of these costs at different unavailability levels of the observed units, the individual criteria, which are dependent on the role and relevance of the observed unit, are quantified and the significance index of the revitalization candidates is calculated. Based on that index, and the condition index of individual revitalization candidates, a single priority list of lines and transformers for revitalization is compiled.