This paper presents alternatives for expansion of the Macedonian electricity supply system. MESSAGE tool is used for modeling the analyzed system, for developing the scenarios, to analyze cost optimal energy pathways and to determine the optimal electricity generation technology mix. The time horizon for the case study is from 2020 (base year) to 2050. Two scenarios are developed and analyzed. Nuclear energy resource and small modular reactors are considered as an option in the second – green scenario.
Keywords: long term planning, electricity supply system, MESSAGE tool, optimal technology mix.