In this study, the potential of important biomass energy sources and animal solid wastes of Turkey were determined and the potential of these as a source of fuel in thermal generating stations to produce electricity was studied. The effects of biomass and lignite coal usage on the environment were reported comparatively. Considering total cereal products and fattyseed plants, approximately 50 65 million tons per year of biomass and 11,051 million tons of solid matter animal waste are produced, and 60 % of biomass is seen as possible to use for energy. The primary energy of applicable biomass was evaluated as 467 623 Peta Joule (PJ) and the energy of animal residues as 50,172 PJ. This amount of energy is equal to 22 27% of Turkey's annual primary energy consumption, (6,308 million tons of oil equivalent).