Reliable electricity and heat production as well as related issues are one of the components of the energy security. Considerable part of general energy sector consists of renewable energy sources, such as wind, photovoltaic (PV), biofuel and hydro. Thus, it is important to assess which renewable resources in the most efficient way should be used and which part of the subsequent energy sector should be covered by energy system of renewable energy sources. In the context of renewable resources

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... e key criteria assessing energy security are the amount of unsupplied energy and the price increase of supplied energy for all possible disturbance cases. Various scenarios of renewable energy sources usage are analyzed in the article that help to predict which one of the scenarios would be the "best" in terms of the energy security and provides a possibility to forecast perspective development of the energy sector.