Fiber-wireless (FiWi) access network is a category of networks which utilize optical network’s bandwidth and wireless network’s flexibility. This last mile technology will serve all needs of access networks for many years to come. However, its energy consumption has also been increased rapidly due to the development of high bandwidth application like Internet of Things (IoT). Therefore, it has become critically important to discuss the energy-related issue for FiWi. Based on the literature, this chapter provides an exhaustive survey of recent progress on energy efficiency mechanisms such as ONU sleeping mechanisms, power saving modes (PSM), and some cooperative-based energy saving schemes. Furthermore, it also provides future directions for better energy efficiency in FiWi network.