On September 14-16, 2020, an international expert conference "Energy Greening" and "Energy and Environment 2020" took place at the Hotel Sepetná in Ostravice. The conference brought together providers of energy units, research and development workers, designers of energy equipment and employees of monitoring organizations in the energy sector who discussed the options of energy greening. The presentations were focused on the experience of operation, implementation and modernization of emission reduction technologies, the issue of achieving new emission limits - NOx, SOx, Hg, etc. at selected sources, construction of new energy sources, modernization of existing technologies, research in the field of energy conversion technologies and reduction of emissions from energy sources.