Energy efficiency (EE) is the relation between the useful output and the energy/power consumption [ITU-T L.1330] [ITU-T L.1331]. Since the sustainability requirements of networks are becoming more and more stringent, novel capabilities are needed for IMT-2020 networks and beyond from the EE perspective. Among them, the end-to-end EE monitoring and control through coordination among User Equipment (UE), access network, core network, data network, services and applications is essential [ITU-T Y.3102]. This Recommendation focuses on the requirements and capability framework of IMT-2020 networks and beyond from the EE perspective. Appendix I provides typical scenarios of IMT-2020 networks and beyond from the EE perspective.