A method for improving reporting of operational data from a wind turbine (WT) during operation thereof; said method comprising the steps of: i) controlling the operation of said wind turbine (WT) by using a control system (CS); ii) in respect of a predetermined time segment allowing one or more sensors (S 1 , S 2 , S 3 , ..., S N ) to sense one or more parameter values representing the magnitude of power production of said wind turbine and allowing said sensors to transmit said one or more parameter values to said control system (CS); iii) from said one or more parameter values transmitted to said control system (CS) in step ii), allowing said control system to determine a total production of energy within said time segment; iv) from said one or more parameter values transmitted to said control system (CS), allowing said control system to determine an accumulated value, representing an accumulated production of energy by said wind turbine until the end of said specific time segment; v) allowing said control system (CS) to transmit, to a monitoring system (MS), data determined in step iii) and iv); vi) repeat steps i) - v) in respect of subsequent time segments; vii) in respect of a time span comprising several of said time segments, allowing said monitoring system (MS) to assess the reliability of data relating to the total production of energy in a specific time segment of said time span, and optionally allowing said monitoring system (MS) to correct such data in case such information is assessed as being unreliable, thereby obtaining corrected data relating to an estimated total production of energy in respect of one or more specific time segments within said time span. i) controlling the operation of said wind turbine (WT) by using a control system (CS); ii) in respect of a predetermined time segment allowing one or more sensors (S 1 , S 2 , S 3 , ..., S N ) to sense one or more parameter values representing the magnitude of power production of said wind turbine and allowing said sensors to transmit said one or more parameter values to said control system (CS); iii) from said one or more parameter values transmitted to said control system (CS) in step ii), allowing said control system to determine a total production of energy within said time segment; iv) from said one or more parameter values transmitted to said control system (CS), allowing said control system to determine an accumulated value, representing an accumulated production of energy by said wind turbine until the end of said specific time segment; v) allowing said control system (CS) to transmit, to a monitoring system (MS), data determined in step iii) and iv); vi) repeat steps i) - v) in respect of subsequent time segments; vii) in respect of a time span comprising several of said time segments, allowing said monitoring system (MS) to assess the reliability of data relating to the total production of energy in a specific time segment of said time span, and optionally allowing said monitoring system (MS) to correct such data in case such information is assessed as being unreliable, thereby obtaining corrected data relating to an estimated total production of energy in respect of one or more specific time segments within said time span. <EOS>