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The increasing number of Internet of Things (IoT) devices in smart cities has resulted in a significant rise in energy usage. To promote sustainability and minimize environmental effects, it is essential to investigate green energy options. This study examines the challenges related to IoT energy usage in smart cities and explores diverse green energy solutions. It evaluates the benefits and drawbacks of solar, wind, and geothermal energy, along with energy-efficient designs for IoT devices and centralized energy management systems. Furthermore, the paper underscores the significance of policy frameworks and collaborations between public and private sectors in encouraging the uptake of green energy solutions.
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