Currently, changes in European energy policy priorities and policies have brought many challenges. It is nessery to solve especially the changes in the global climate, ever-decreasing oil and gas reserves and the rapid rise of energy prices, reduced energy safety. The aim of this contribution is to point out the positive effects of the liberalization of the energy market in Slovakia. Therefore, we will analyze the timing of the creation of a single gas energy market in the household sector. We have used the Herfindahl-Hirschmann index, switching to reflect the relationship between the concentration rate and the number of companies, which are operating on market. To achieve this goal, we have used a variety of methods, from collecting information, especially from scientific works from both, foreign and home authors. From the scientific methods we used mainly coupled methods of induction and deduction, analysis and synthesis and to better illustrate of the results obtained, we used graphical and mathematical methods, which are mainly used for the clear presentation of our results in tables and charts.
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