With the rapid development and commercialization of 5G radio communication technology, the 5G network construction is further accelerated. While being an important enabler for digitalization of other industries and thereby contribute to significant energy savings and emission reductions, it is also important to consider the energy consumption of the 5G network infrastructure itself. This Recommendation identifies energy saving potentials, describes energy-saving principles and technologies for 5G RAN and related equipment, and provides best practice recommendations when and how these technologies should be used and controlled thereby reducing the 5G RAN energy consumption, saving operational costs, and making the 5G RAN a green and high-efficiency network