The topic of this the sis is “Liberalisation and development of the electricity sector market in the Republic of Croatia The the sis is structured in six chapter. The focus will be on the electricity market with partial review of the gas sector. The aim of the thesis is to show the entire sector development and the current state of the market The liberalisation of the energy sector market was necessary and indispensable. It could be said that liberalisation has created a partially positive impact on the market in Croatia, but the expected progress and direct benefit for final customers, as happens in other Member States of the European Union, are not visible. The aim of liberalisation was, of course, the full opening of the market and the emergence of more market operators, all to provide greater choice for final customers. It also sought to create an energy community of European countries in order to establish energy independence and a more prominent position for Member States. The implementation of today's energy policy in Croatia stems from Croatia's accession and accession to the European Union on 1st of July 2013, thus making Croatia a full member of the European Union whose legislation is compatible with the Acquis equip of the European Union. The Croatian energy market is completely open, both for households and businesses. It is a formally separate production and supply activity in which there has not been an expected increase in competition, i.e. the emergence of a sufficient number of market participants to create a competitive market. Network activity was also set aside, but remained a "natural monopoly" owned by the state. Market liberalisation has not led to an anticipated fall in market prices, and the market volatility we are witnessing in recent years lead to a growing interest in investing in renewable energy sources that represent the future, both Croatia and other countries in Europe. We are witnessing how external factors such as war and other situations directly affect the energy sector, both in Europe and in Croatia. Turning to energy independence is essential for a uninterrupted and secure supply. Decarbonization and investment in renewable energy sources is a key path to the realization of the European Green Plan, and Croatia is making good progress. Ultimately, the question arises whether the Croatian market truly feels the real effects of liberali s ation?