The global energy sector requires a significant transition from fossil fuels to more sustainable energy alternatives. This change is driven by a variety of factors, including the urgent need to combat climate change, the exhaustion of non-renewable resources, and the growing energy demands resulting from rapid urbanization and industrial growth. Addressing these challenges calls for innovative approaches and strong policies to speed up the shift toward renewable energy, aiming to create a sustainable and secure energy future. The study focuses on relationship between renewable and non-renewable energy with economic growth of developing and developed nations using multiple regression. The top developed and developing countries were selected for the study over the period of 1991 to 2020. The result highlights a contrast between developed nations, which are generally transitioning towards renewable energy with varying rates of success, and developing nations, where there is a concerning decline in renewable energy usage accompanied by increased reliance on non-renewable sources. Developed countries such as Germany and the UK show significant progress in renewable energy adoption, positively influencing their GDP growth. In contrast, developing nations, including Brazil, China, and India, face challenges with diminishing renewable energy consumption, which could hinder their sustainable development efforts. The findings emphasize the need for developed nations to enhance their renewable energy investments and assist developing countries in achieving energy sustainability. Developing countries must implement stronger renewable energy policies and infrastructure investments to balance economic growth with environmental stewardship.