• The primary energy performance =
  (total energy used – renewable energy supply) x national primary energy factors.
• The total energy used includes the building and user coupled energy consumption.
• The energy demand and the energy produced by renewable sources must be monitored on a yearly basis. Metering devices are to be used for all types of energy production/consumption at the building level.
• The annual energy performance evaluation shall specify the supply from:
• individual renewable energy sources integrated into the building
• energy supply from local energy system and the share of renewable energy as well as the CO2 emissions from the local energy system.
• Calculation of primary energy and CO2-emissions shall be based on the national calculation methodology, using nationally-adopted efficiency/conversion and emission factors, as well as climate data.