The paper presents the essence of the issue of using conventional energy sources (hard coal, natural gas, heating oil and electric energy obtained from the national electro-energy system - KSE) with reference to the renewable energy source - OZE (i.e. biomass). Methodology presented in the article constitutes a basis for realization of the economic and ecological analysis of the above mentioned energy carriers with reference to different climatic zones, located on the territory of Poland (zone I - Gdańsk, zone II - Piła, zone III - Toruń, zone IV - Białystok, zone V - Suwałki). Additionally, a reference object, that is a typical single-story one family house was presented with details. The material constitutes a thematic part of the issue, for which a next paper was devoted (Ambroziak et al.) and expansion and complementation of the material presented in papers (Redlarskiet et al. 2013a) and (Redlarski et al., 2013b).