Monopoly is a market structure that has its significant prosthesis far in history, and has replaced the legs of market structures. Monopoly, as a market structure, is characterized by the following products: its own technology, network effect, footwear economics, and a brand that solidifies a one-sided product that creates a monopoly and markets it only. This market structure is for market and its liberalization very detrimental because it brings most damage to the market, offers a unique product, has no competition and consumers have been denied the right to choose between most products that can be affordable and qualitatively available from what the monopolist offers. Croatian Electricity Company (hereinafter referred to as HEP) is represented on the national market by Croatia as a leading national energy company, which is the main economic activity producing, distributing and supplying electricity throughout the country through a subsidiary. Considering the state of the concern and the fact that in Croatia it is the only company providing electricity services, HEP has a dominant position in the market and is the only one in this business. Therefore, in the case of HEP - it can be said that this company has a deep-rooted monopoly position that has lasted for a century.