The material constitutes continuance of the issue presented in (Ambroziak et al. 2013). The article presents the results of the economic and ecology analysis of biomass (pellets) compared to others, commonly applied energy carriers (hard coal, natural gas, heating oil and electric energy produced in the national electrical and energy system - KSE). The above analysis was carried out on the example of the residential building, constituting a one-family house located in various climatic zones on the territory of Poland (zone I - Gdańsk, zone II - Piła, zone III Toruń, zone IV - Białystok, zone V - Suwałki). Based on the above mentioned research a number of conclusions presenting advantages of biomass as a renewable energy source (RES) compared to other conventional energy sources were presented.