This paper explores the dynamic legislative landscape of Ukraine’s energy sector, focusing on integrating renewable energy sources alongside the development of nuclear power plants (NPPs) to enhance energy security and meet climate objectives. Ukraine’s strategic policy initiatives, including accelerating new NPP preparations by 2024, highlight its commitment to diversifying its energy mix and reducing greenhouse gas emissions. The enactment of the "Law of Ukraine on Alternative Energy Sources" in 2019 and the "Law of Ukraine on the Electricity Market" in 2020 underscore Ukraine’s efforts to align with international standards, particularly those of the European Union, by fostering a competitive and liberalized energy market conducive to innovation and sustainability. Additionally, including scenarios from the World Energy Council’s 2021 report emphasizes the critical role of innovative energy solutions in achieving sustainability. By analyzing these legislative measures and their impact on the energy sector, the paper discusses how Ukraine positions itself as a leader in the transition to a more sustainable and secure energy future through a balanced approach to nuclear power development and renewable energy production.