[en] The paper deals with the application of the MESSAGE model for analysis of the energy sector development in three Baltic countries - Estonia, Latvia and Lithuania. The main issue for the Baltic countries is an efficient, secure and environmentally benign manner of power system development after the predetermined closure of the Ignalina NPP, the biggest power plant in the region. The paper focuses on the methodology of analysis, describes in detail the structure of the multi-regional model, presents options analysed for the future power system development, gives characteristics of the scenarios analyzed. The paper focuses on highlighting the circumstances under which a new nuclear power plant can be economically justified in the region. (author)