Results of the efficiency measurement at TG2 in EDF HPP La Chaudanne, France were submitted to the customer on April 23th 2018. The site tests were performed in December 2017. The power plant is situated on the Verdon River in region Alpes-de-Haute-Provence and controls the flow rate in the famous canyon Verdon. The dynamic phenomena in the pressure sensor connections, which can affect the accuracy of the flow measurement, have been analyzed in detail in collaboration with the measuring and expert group EDF - DTG.