Research background and purpose:
The main purpose of the article is to analyze the share of renewable energy sources in Poland's energy mix and to assess the management of the cost-effectiveness of their use, with particular emphasis on their impact on energy production costs, energy system stability and CO₂ reduction.

Design/methodology/approach:
To achieve the purpose of the article, the author used a triangulation of research methods, which included a literature and regulatory review, scenario modeling and three analyses: statistical data, cost and energy efficiency. By using the above methods, the study will allow a comprehensive assessment of the role of renewable energy sources in the Polish power system and their impact on its cost efficiency.

Findings:
The share of RES in Poland is growing, but still remains lower than in many EU countries, despite the fact that the cost of producing energy from renewable sources is steadily falling, making it increasingly cost-effective. Key barriers are the lack of developed storage infrastructure and legal restrictions for onshore wind farms.

Value added and limitations:
The article provides up-to-date and detailed data on the structure of renewable energy consumption, taking into account the latest trends, regulations and technologies. A unique contribution is the analysis of various RES technologies in terms of their profitability and impact on energy prices, which provides practical conclusions for policy makers and investors, as well as the author's interdisciplinary approach - combining economic, legal, technological and social aspects. In conclusion, the value of the article stems from its timeliness, comprehensive approach and the possibility to use the results to shape energy policy and investment strategies in Poland.