In the present study two different sets of assumptions for future power production scenarios, one based on conventional technologies and another assuming a more sustainable energy oriented electricity production, for the Baltic States are analysed to identify the possible marginal electricity sources which could be used in consequential Life Cycle Assessment (LCA) studies in these countries. The environmental impacts of electricity production often account for a major portion of the total environmental burden in LCAs of many products and services. It is known that the environmental impacts of electricity production vary significantly between different energy sources, thus the choice of input data could significantly influence the final results of LCA studies. Therefore, it is important that the LCA practitioners and those who draw conclusions based on LCA studies have both an understanding about data sensitivity issues and the development of energy systems. In this article the implications of marginal data choices in LCA are discussed on the basis of a case study on energy production from municipal waste incineration in the Baltic States.

Negative environmental impacts of oil shale use, whether for electricity production in power plants or for extraction of oil, are well known, thoroughly studied and comprehensively addressed at past and present issues of our journal. To reduce negative effects of oil shale use, countries and companies as well as research institutions involved in utilisation of oil shale reserves or studying the related issues have proposed and implemented mix of policy instruments: regulations, economic instruments, research and development, education and information, investments into technology shift etc. Significant results in achieving these goals have been recently obtained by pioneering the use of the CFB boilers for oil shale combustion on large scale at Narva Power Plants Ltd. Still several problems related to semi-coke disposal and hydraulic transportation of shale ashes have to be solved via technology shift at the existing plants in order to meet the compliance with coming legislation after EU accession.The European Union (EU) is constantly keeping in focus human health and environment quality, thus policies and measures taken in order to implement the present environmental, economic and social policies are more and more considering and integrating environmental concerns. Recent approval of the CAFE (Clean Air for Europe) Programme of EU, means largely strengthening of environmental regulations, particularly the ones concerning

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