Croatian Transmission System Operator Plc is a company that operates as a monopoly in the market since it is the only transmission system operator in Croatia and the owner of the entire Croatian transmission network. The focus of future business is a plan to invest in infrastructure worth 65 million euros over a longer period of time, and the first major project selected is the replacement of 110 kV submersible cables. This is also a strategic project of the Republic of Croatia that will ensure the power supply of island infrastructure, and the funds are co-financed through available funds from the European Union. Considering the situation of the energy and electricity market, HOPS Plc has faced liquidity and financial performance problems in recent years, and in 2022, the company operated at a loss. One of the reasons is the introduction of the so-called balancing service, whose financial aspects are analyzed in this paper. The paper evaluates the business performance of HOPS Plc through an analysis of the most important economic parameters of HOPS Plc with comparable European operators. These operators are: ČEPS (Czech Republic), SEPS (Slovakia), MAVIR (Hungary),and ELES (Slovenia). In 2021, HOPS Plc had higher network losses compared to consumption than other operators. Also, it had a lower revenue-to-expense ratio compared to ČEPS and SEPS, relatively old facilities, and unsatisfactory use of assets. The number of employees is twice as high as other operators, and the company's indicators indicate an increase in indebtedness from 2019. to 2022. However, it is estimated and expected that further development of infrastructure, maintenance of existing and investment in new infrastructure and renewable energy sources, increasing the number of users, developing services, and stabilizing the situation in the energy and electricity market will improve the company's financial position.