Yes, the Gridcognition platform will automatically create a solar system yield using the longitude and latitude coordinates for your site together with the system parameters you specify. However, if you have your own modelled solar data for a site from third-party software, perhaps because you’ve used PVsyst or similar, then you can upload it to your Library and add it to your simulation. So, your two options are: 1) Create the PV asset in Gridcognition and it will be modelled for you or 2) Upload your own solar yield data.