The aim of the present document is to find and describe methods and best practice to assess energy performance (Energy Consumption and Energy Efficiency) of a future RAN deployment. The results documented will include a summary of previous work@ a collection of important preconditions as traffic aspects (growth@ new traffic classes@ potential disruption)@ collection of energy efficiency/saving solutions and strategies and energy issues in current networks. Network energy performance assessment method examples based on set of scenarios including different solutions. The assessment period is at least until 2020@ optionally also including 5G impact. Energy consumption and efficiency definitions from ETSI ES 202 706 [i.18] and ETSI ES 203 228 [i.19] are preferred.