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Renewable sources play a crucial role in the decarbonisation process of the current linear economy, aimed at reaching the 2030 climate objectives and fulfilling the EU's long-term strategy of achieving carbon neutrality by 2050. All economic subjects, including households, can contribute to the Green Deal goals. The main goal of this paper is to evaluate households' consumption of energy sources for heating purposes in the Czech Republic in the period 2003–2020 and depict possible drivers of switching to biomass. For this, various data were collected, such as data published by the Czech Statistical Office, ministries, and other national authorities, as well as data from Eurostat. Concerning methods, data analysis, correlation analysis, and regression analysis were used. Different models focus on the substitution effect, rebound effect, and behaviour of different kinds of households. The results show a substitution effect connected with the consumption of coal, electricity, and biomass for heating purposes. Many households substituted coal for biomass in the observed period. On the other hand, the environmental impact of such substitution is not significant, as carbon emissions and emissions of other pollutants are stable. The substitution of fuels should be accompanied by technological change, e.g., improvement of combustion boilers. Moreover, households of pensioners are the key economic subjects with the highest impact on biomass consumption for heating purposes. Against this background we recommend policies to support households in replacing their boilers for more environmentally friendly ones. [ABSTRACT FROM AUTHOR]

The number of companies using photovoltaics for the purposes of self-production of electricity is increasing. Generally, we can observe a new category of economic subjects - prosumers, which are simultaneously consumers and producers of selected goods, in this case electricity. The main goal of this paper is to evaluate the economic parameters of the company-prosumer, focusing on a selected administrative building which consumes both electricity from the grid and self-produced electricity. The system is not equipped with a battery; therefore the entire amount of electricity produced is consumed within the company. Firstly, the policy background and a literature overview connected with the issue of prosumers will be presented. The methodological section will focus on data sources and parameters for the model of a companyprosumer and a description of economic indicators used in the evaluation. The technical and economic parameters of the case study will be described. The Results chapter will firstly show the possible relationships between the amount of electricity produced by the photovoltaic power plant and selected natural conditions of the locality. Subsequently, particular economic indicators for the selected company-prosumer will be presented, using two scenarios with different electricity price tariff regimes. Generally, the case study is focused on the photovoltaics installed on the roof of an administrative building located in Olomouc, Czech Republic. Based on the results from the developed company-prosumer model, we can say that the economic indicators of the particular photovoltaic projects, and simultaneously the payback period, are highly sensitive to the price of electricity purchased from the grid and to the particular purchase price tariffs. [ABSTRACT FROM AUTHOR]