In order to realize 5G’s full potential, 5G deployment requires a more complex network with more powerful network elements, Internet of Thing (IoT) end nodes, and gateways. As compared to previous generations, 5G is expected to be flexible and agile, capable of supporting independent network slices for different applications. In addition, 5G is expected to have ubiquitous presence across different markets, so addressing energy consumption issue right at the onset of 5G deployment is a timely and effective way to make 5G as sustainable as possible.