In this paper, we present and analyze the evolution of the thermopower plant (TPP) Voitsberg of Austria from the past, when there were no measures taken against pollution, to the present, when it is provided with desulphurization (Desulph) and Denox systems and installations, and we globally evaluate it from the point of view of its energy ecologic efficiency. Using the results of the analysis for the TPP Voitsberg, we similarly analyze the TPPs of Romania with power units of 330 MW, and we propose measures to improve the energy ecologic efficiency in the existing TPPs, as well as to comply with the European norms regarding pollutant emissions for new units and those which are to be continued.