Non-Gateway Supplier A Non-Gateway (Electricity) Supplier or a Non-Gateway (Gas) Supplier.Related Articles: Glossary: NGI Change of Credentials RequestGlossary: Non-Gateway Supplier SystemsAlternative Meanings: Non-Gateway SupplierA Party that holds an Electricity Supply Licence, but which is not a User for the User Role of 'Import Supplier'.« Back to Glossary Index