• The PR will be calculated according to the following formula:Eproduced systemenergy[kWh] Produced system energy will be measured on site. The relevant meter where produced energy will be measured shall be the one where remuneration for electricity production will be granted. (metering in the substation)• GTIGlobal Tilted Irradiance [kWh/m2] Averagevalue of thecalibrated tilted pyranometers from the installed meteorological measurement stations. Sensors must be cleaned daily.• GTIdown timeexternal[kWh/m2] Downtime due to external factors to be excluded. External factors such as grid unavailability or inverter curtailment due to reduced grid capacity.• Atotal module area [m2]Total area of PV module• ηSTC module [%] According to PV module datasheet• αtemp Factor This factor will be used to improve the accuracy of PR measurements to compensate the difference between simulated monthly and real measured module temperature by the sensors of the meteorological station.The following formula shall apply for the temperature correction factor: