2025-07-25 00:00:00 The MyGelsia app was designed to easily manage and monitor your energy and gas supplies. Welcome to the new Gelsia application. Are you one of our customers with electricity and natural gas supplies? Find out what you can do: Manage your supplies: you can check your bills, tell us your meter reading, activate direct debit for your bills, activate the email bill service, consult the status of your requests. Consult the account statement: you will be able to view the amounts and bills issued and download the PDF.