Hi Sondre207, first of all: The import of PVGIS horizons will be a built-in feature in the upcoming major release, PV*SOL premium 2022 R1, due this autumn/winter. In the meantime you can simply open the exported csv file in Excel or any other spreadsheet software, and add 180 to the azimut values in another column, like so:   Then you can just copy the azimuth and the elevation column (B and C in this example here), and paste it into the horizon table in PV*SOL: