Each member state should calculate the 1.5% annual energy savings target for 2021-2030 by multiplying 1.5% with the energy sales (to final customers by volume) average over the previous three years prior to 1 January 2019. The savings should have a cumulative effect with 1.5% saved in 2021, reaching 15% in year 2030 (1.5% times 10 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 2030. ( 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 cost-effectiveness criteria.