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.

Entry capacity

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.

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Exit capacity

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.

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Latest capacity update

The Enduring Exit Application windows for both increase and decrease requests is currently open.  The window for decrease requests is open until the 13th July 2018 and the window for increase requests is open until the 31st July 2018.

The Annual Exit Application window is also currently open and will close on the 31st July 2018 

The Ad-hoc Quarterly System Entry Capacity (QSEC) auction window will open on the 23rd July 2018 and be open for up to 10 business days

About capacity

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:

For Gemini training materials and operational processes, please go to the Xoserve website. You can find more about Gemini contingency on the Joint Office Website.

Processes to be followed and proforma to be used in the event of a Gemini Code contingency are located here:

Download the Gemini Code Contingency Guidelines document



Gas charging and methodology

To find out more about gas charges and how those charges are determined, please refer to the Gas charging and methodology pages.

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