U radu se izlažu rezultati teorijsko-metodološke razrade modela kojim se proizvodne jedinice, na čiji rad, odnosno pogonske osobine, a time i raspoloživost i pouzdanost utječe stanje okoline, najčešće nepovoljne atmosferske prilike, uključuju u modele za izračun pouzdanosti i raspoloživosti elektroenergetskog sustava pri operativnim planiranjima njegova rada. Model proizvodne jedinice s uključenim uvjetima okoline pokraj ovisnosti o vremenu u izračun pokazatelja pouzdanosti i raspoloživosti elektroenergetskog sustava uvodi i ovisnost o uvjetima okoline u kojima se jedinica nalazi tijekom vremena izloženosti tim uvjetima.This work presents the results of the theoretical-methodological elaboration of the model by virtue of which the generating units are included in the models for calculation of reliability and availability of the electric power system in the operative plans of its operation. The operation, that is, the operative features of these generating units, and therewith also their reliability and availability, are influenced by the state of the environment, mostly by adverse weather conditions. The generating units model with environmental conditions included also introduces into the calculation of indicators of the electric power system reliability and availability, along with the time dependence, the dependence on the environmental conditions which the unit is exposed to during duration of the period of such conditions
