International agreements and national policy aiming at emission reduction require information on the current situation as wed as recommendations on how to avoid harmful environmental effects in a cast-effective way, Energy-environment models, such as the LP-model EFOM-ENV, can be used (1) to analyze the influences of structural changes and energy saving measures (2) to study the effects of strategies aiming at a simultaneous reduction of multiple pollutants and (3) to develop emission and deposition reduction strategies, Selected results of EFOM-ENV applications in several Central and Eastern European countries are presented here, They show a high potential for fuel and technology switching as well as for energy saving measures in these countries. This leads to emission reduction costs which are significantly lower than in Western European countries,