 This paper presents a comprehensive exploration of energy management strategies and sustainable smart cities using the Internet of Energy, IOE, with the goal of improving clean energy processes, environmental benefits, efficiency enhancements, sustainability, and cost reduction. The study covers various energy management approaches, including scheduling optimization, low-power device transceivers, cognitive frameworks, cloud computing technology, smart grids, energy harvesting, and sustainable smart cities across different domains. The paper concludes by proposing a novel conceptual framework and identifying enabling technologies for effective energy management in sustainable smart cities, while also outlining current research challenges and potential research directions relevant to energy management within smart cities. This article was offered by Priyanka Mishra and Gonsham Singh.