In July 2021, This wont yet be possible through EPIC.
You can however do it manually by sending an email to your KAM or to email@example.com or through the "Customer Hub".
How can I set up e-Invoicing in "Customer Hub"?
#1 : Change request - 'invoicing type'
#2 : Select 'electronic'
This will have an impact on all invoicing from Elia to your company.
When you switch to e-invoicing you must also give an e-mail address to which reminders will be sent (other communications related to invoicing)