The extra space it takes up (versus using the online EPG) is the size of the XML file you saved. (You can choose not to save data on the PC in the configuration area.) With this technique, you need to download a new EPG each day after it is updated online or the data will time out. It doesn't take much time to perform the daily ritual (about two minutes), but some folks want things fully automated or they won't put up with it.
At least this lets us know the EPG can load. There is nothing wrong with that aspect of your Kodi installation. And this provides a way to have an EPG on your PC.