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Applying for a connection

Connecting to the National Transmission System (NTS) is suitable for a wide range of gas customers, including the largest consumers such as distribution networks, power stations, and large industrial enterprises. We will also connect newer forms of indigenous gas such as biomethane producers, small gas generators, shale and compressed natural gas users; we will open applications for this from late 2018. We offer three types of connection: entry, exit, and storage. All new connections follow the Application to Offer (A2O) process. 

If you have a question about a domestic property or home, please contact your local distribution network operator (DNO).

If you have any questions about NTS gas connections (for large industrial consumers) please contact us by email and we will be happy to help.

[email protected]

We do not provide home or domestic connections.  Please contact your local distribution network operator (DNO).

Application to Offer (A2O) process

Who should apply

Transmission connections are appropriate for a range of gas users, including:

  • gas distribution networks; 

  • major industrial premises, such as power stations;

  • combined heat and power (CHP) schemes;

  • a few major energy-intensive industries; and

  • lower-flow gas users such as biomethane, small gas generators, shale and compressed natural gas (for application in late 2018).

How to apply

To start the process, you will need to: 

Download the application document

Download the application guide

How long it takes

The period from clock start to issue offer depends on the type of offer to be made.

  • An initial connection offer (ICO) will be made within two months;

  • A full connection offer (FCO) requiring a conceptual design study will be made within six months.

  • A full connection offer (FCO) requiring a feasibility study will provide the feasibility study report within three months, and the offer six months following acceptance of the report by the customer.

How much it will cost

Initial connection offer (ICO)
Connection criteria
Timescales to provide an ICO
Application for new or existing connection (entry, exit, or storage)
SimpleUp to 2 months£14,000
MediumUp to 2 months£14,000
ComplexUp to 2 months£14,000
Full connection offer (FCO)
Timescales to provide an FO
Minimum offtake connection in a 'green-field' site (exit)
Up to 6 monthsn/an/an/a£73,000*
Up to 9 months£151,000#£151,000#£151,000#n/a
Up to 9 months£449,000#£449,000#£449,000#n/a

* Feasibility studies are not required for this category type. 

# A feasibility study, ramp rate study, transient analysis, or all three may be undertaken depending on the customer requirements for this category type. The cost is included in the application fee.

For more detail about the costs of the connection process, please download the Statement for Gas Transmission Connection Charging document.

Modifying an offer

If you wish to amend a live connection offer you are required to complete and submit an Application to Modify a Full Connection Offer.

If you wish to apply for a modification to an existing NTS connection you must follow the A2O process and complete our standard A2O application form.

A2O documents and support

Performance reports

Our regulator Ofgem requires us to publish a quarterly report on how effective we are in delivering connection offers.  


How we handle entry and exit capacity, including how to bid for entry capacity and apply for exit capacity, as well as current and historical capacity data.

Find out more

Charging and methodologies

Details about charges that users of the gas National Transmission System (NTS) have to pay, how they are calculated, and how we handle capacity.

Find out more