For the location based method, you do not need to insert an emission factor. You only insert the amount of energy that you purchased in MWh and NIVI will take an average emission factor that represents:

• all electricity production occurring in a defined grid distribution region that approximates a geographically precise energy distribution and use area. E.g., The Danish Energy Agency (DK), DEFRA annual grid average emissions factor (UK), eGRID total output emissions rates (US), etc.
• all electricity production information from geographic boundaries that are not necessarily related to dispatch region, such as state or national borders. E.g., IEA national electricity emission factors.