each member state should calculate the annual energy savings target for by multiplying with the energy sales to final customers by volume average over the previous three years prior to january the savings should have a cumulative effect with saved in reaching in year times years in practice member states have a flexibility to ensure the achievement of their energy savings overthe whole period as long as the total amount is achieved by in new buildings of or when a building undergoes major renovation individual meters shall always be provided the proposal does not in this case include a clear costeffectiveness criteria