||The thesis deals with the problems faced by the regulatory authority when monitoring natural monopolies. Three main objectives are set out within the work. Firstly, I will compare the theory of regulation with its practical application to the energy sector in the Czech Republic. The second objective covers a comparison of two methods of regulation and their impacts on a consumer and the regulated company. For this purpose prices set by regulatory authority have been compared with prices created by Price-cap method. The third objective is the analyses of electricity prices ranging from the initial operating of the regulatory authority in the Czech Republic. The outcome of the thesis is the description of the regulation of energy market in the Czech Republic focusing on the theories of regulation.