This study uses a thorough multi-criteria decision-making (MCDM) framework to assess and compare the renewable energy performance of Türkiye and 26 other EU nations. The purpose of this study is to evaluate how well these nations have advanced during 2015, 2020, and 2023 in their transition to sustainable energy. To represent the multifaceted nature of the performance, twelve quantitative variables pertaining to the production, consumption, efficiency, and dependency of renewable energy were used. Three well-known techniques—CRITIC, LOPCOW, and Standard Deviation—were used to compute weighting coefficients in order to impartially assess the relative significance of these variables. The rankings of countries were then obtained using five different MCDM procedures (ARAS, COPRAS, CRADIS, GRA, and TOPSIS), which were then combined using the BORDA aggregation method to get a final comprehensive rating. The findings show a constant pattern of leadership, with Sweden, Finland, Denmark, Germany, and Austria leading the pack. This trend is ascribed to the consistency of policies, the ability to innovate, and the successful integration of renewable energy sources into national grids.

On the other hand, due to institutional fragmentation, financial limits, and structural limitations, Eastern and Southern European nations fare comparably poorly to Türkiye. However, Türkiye’s score shows steady progress over time and increasing potential with the right policy alignment. Overall, the results indicate that Europe’s renewable energy landscape remains divided along North-South and West-East lines. To support a more equitable and balanced transition to renewable energy across the continent, the report emphasizes the need for long-term policy stability, regional cooperation, grid modernization, and inclusive funding mechanisms.