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. It is now possible to connect newer forms of indigenous gas such as biomethane producers, small gas generators, shale and compressed natural gas users.

We offer three types of connection: entry, exit, and storage. All new connections follow the Application to Offer (A2O) process. 

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

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.

How to apply

Update 30th October 2018: Following the delivery of Project CLoCC, Applications for Standard Design Connections can now be considered. If you have a project you would like to discuss please contact us at [email protected].

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) - non standard design
Timescales to provide an FCO
Minimum offtake connection in a 'green-field' site (exit)
Up to 6 monthsn/an/an/a£73,000*
Up to 9 months£109,000#£109,000#£109,000#n/a
Up to 9 months£406,000#£406,000#£406,000#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. Where a Ramp Rate Study is required the Application Fee for a Ramp Rate Study will be added.

Full connection offer (FCO) - standard design
Timescales to provide an FCO
Minimum offtake connection in a 'green-field' site (exit)
Up to 3 months - Fixed fee£13,000£13,000£13,000£13,000
Feasibility study additional 3 months£14,000£14,000£14,000£14,000


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.

Application documents

A2O application form and guides

These documents include the application forms and application guides required to request an offer for a new connection.

Standard conditions of contract

Standard Conditions of Contract for the Design and Build of National Grid Facilities

Connection charging statements

Connection agreements

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


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