The research focuses on the multiple ways in which technological innovation in the management, governance, and security of renewable energies contributes to making smart cities capable of integrating renewable energy systems that lead to more sustainable, efficient governance, and security resilience for the cities. A literature review of Scopus has been done with the aim of asserting at the juncture of smart cities, technological innovation, and renewable energy integration. Co-occurring and co-authorship analyses have been performed by VOSviewer for mapping the key research themes, collaborative networks, and research gaps. Core research themes include smart cities, IoT, renewable sources of energy, urban planning, AI, big data - lots of them, actually. Key areas for concern comprise cybersecurity, social equity, human-centered design, and adaptation to climate change. International collaborations identified through co-authorship analysis mirrored strong contributions from Pandolfi Alessandra and Galiulo Valentina. There are major knowledge gaps with respect to addressing, for example, how combining the elements of energy efficiency and cybersecurity under one umbrella could be defined as a smart city. Contribute uniquely in this area, and analyze the effects that the aggregate technological innovations and integration of renewable energy have on enhancing urban sustainability, governance, and security. These advances indicate ways in which urban systems can be optimized in order to enhance quality of life and lend to more sustainable and resilient urban environments. This study synthesizes interdisciplinary research in a novel manner in pointing out new areas that smart city development has barely touched upon.