On these pages you will find out more about how the National Transmission System (NTS) handles entry and exit capacity, including how to bid for entry capacity and apply for exit capacity. You will also be able to retrieve current and historical capacity data on these pages.
This page provides an overview of entry capacity including the types of capacity available, the different types of auctions, and the responsibilities of users and National Grid.
This page provides an overview of exit capacity including the types of capacity available, the different types of applications, and the responsibilities of users and ourselves.
Latest capacity update
The Enduring Annual (Flat) Exit Capacity (EAFLEC) and the Annual (Flat) Exit Capacity (AFLEC) windows are now closed. All successful AFLEC applications will be allocated on or before Monday 14th August and the EAFLEC applications will be allocated on or before Friday 29th September.
Capacity gives shippers the right to flow gas on and off the National Transmission System (NTS), and so capacity is often also referred to as ‘rights’ or ‘entitlements’. A shipper needs to buy one unit of capacity in order to flow one unit of energy on or off the system. This is known as the ‘ticket to ride’ principle. Units for both capacity and energy are in kWh/day.
Gemini contingency arrangements
Here you will find guidance on the Gemini Code contingency arrangements should a failure of the Gemini system occur. The processes detailed on here should only be followed when we have declared a Code contingency.
When contingency arrangements are being used, news updates will be provided via the standard communications channels:
Active notification system (ANS)
Prevailing view section of MIPI including the MIPI news area (office hours only)
Processes to be followed and proforma to be used in the event of a Gemini Code contingency are located here: