Analysis of financial effectiveness proved by electricity sources, within the concept of sustainable development, based on the Polish example

The article presents the issues related to EU member states - including Poland - shifting to proecological sources of energy. Purpose of the article is to demonstrate limitations of quick electrical reorganization of EU member states, as well as possibilities and opportunities for utilizing the existing technologies, according to the principles of sustainable development. It also points to financial effectiveness of the described processes as well as to the arguments for stable and sustainable transformations within the energetic sector in Poland.