In the light of contemporary economic challenges, more and more significant attention is focused on achieving sustainable development using renewable energy sources. The subject of this research was investments in photovoltaic power stations in the territory of the Republic of Croatia. Through a detailed analysis of the process of their realization, the potential of the economic profit that such an investment brings is estimated. In addition to defining the Croatian solar potential, financial support programs for photovoltaic power plant projects were presented. Special attention is paid to the integration of solar panels as a sustainable energy solution. The necessary legal permits and key technical factors for their installation are discussed. In order to determine the perceptions and achieved results of users of photovoltaic power stations (solar systems) in the Republic of Croatia, a survey questionnaire was conducted. The analysis of the answers shows that the majority of the respondents made significant savings on their electricity bills. Additionally, a statistical significance test determined that the geographical location of the power plant in the Republic of Croatia affects certain key technical factors, such as panel orientation, where optimal efficiency is achieved with proper selection. According to the results of the research, the most common return period for invested funds is a period of 6 to 10 years. In addition to the above, the existing correlation of financial profitability and the achieved reduction of bills confirmed the hypothesis of the work, that the main factor of investment in photovoltaic power stations is significant long-term savings on energy bills.