2026 Billing Calendar

Each year, we publish a billing calendar which details all the scheduled invoicing dates across the year. These include payments relating to transportation, energy and our role as Central Data Service Provider (CDSP).

Our 2026 Billing Calendar contains a breakdown of individual invoices across each month, along with their respective issue and payment due dates.

Our 2026 Billing Calendar is available in three formats: PDF, iCal and CSV

As well as the PDF for you to download, we’ve also produced an iCal version to import directly into your online calendar, and – following the implementation of XRN 5690 – the CSV file which allows you to load the key billing dates directly into your own systems.

More information on our invoicing processes

You can find more information on the Xoserve invoices you receive on our dedicated Invoice type, charges & VAT webpage.

This page provides an overview of invoicing, details of the various charge types on each invoice, and descriptions and tax status of charge types.

We also have online invoicing training material which provides overviews of all the main invoice types we issue on behalf of the Distribution Networks and National Gas.  

Introduction to invoicing