We know that the journey to get connected can seem complex, and that you might have queries around the different stages of your connection journey.

To help you better understand what each stage means for you, we have answered a list of frequently asked questions.

Two step offer update: For more information on two step offers, and the recent changes to the process, please visit here: https://www.nationalgrideso.com/news/update-two-step-offers-process-connections


Researching your connection

What is the role of NGET in my connection?

NGET does not contract directly with the customer. The ESO will contract with us to build the connection and any related works. We will still be in regular touch with you on the progress of your connection, as well as being fundamental to your initial offer through the system studies we conduct. We will also conduct any studies needed if a modification application is made to your connection.

What is the role of the ESO in my connection?

The ESO contracts with you directly as the connecting customer. You will submit your application to the ESO, and they will send it through to NGET for assessment once they have conducted their necessary checks. They will also manage your contract should any changes need to be made. They will have regular contact with both NGET and you to keep track of your connection.

What is a feasibility study?

A feasibility study is a bespoke study that may include a detailed analysis of the National Electricity Transmission System (NETS) to cover all areas such as connection options, infrastructure, construction, project timescales, costs, charging issues, risks, etc. 

Both NGET and ESO offer the chance to conduct feasibility studies on your connection. Visit our costs page to find out more: https://www.nationalgrid.com/electricity-transmission/how-to-get-connected/researching-your-connection/how-much-will-it-cost

What is connection capacity?

Your connection capacity will be declared in two forms. The first is your Connection Entry Capacity (CEC), this is the maximum potential output of your asset onto the National Electricity Transmission System (NETS). The second is your Transmission Entry Capacity (TEC). The TEC is the amount you will export onto the NETS as a generator. CEC is often set higher than TEC to allow for changes over years in outputs without needing to adapt or modify infrastructure.

What are the connections registers and why should I use them?

The connection registers will give you an idea of how many current connections exist and at what capacity. There are a variety of connection registers available such as the Transmission Entry Capacity Register and the Interconnector Register on the NGESO website.

We advise that you review the connection register appropriate to your connection type to help inform you of what other connections to the National Electricity Transmission System are currently ongoing. These connection registers could help inform you of where, or when you want to connect.

What are the industry codes?

The industry codes underpin the electricity and gas wholesale and retail markets. Market participants are required to comply with the industry codes in accordance with the conditions of their licence. The National Grid ESO administers four of these codes. They are the CUSCGrid CodeSTC and SQSS.  

For more information on these codes, visit here: https://www.nationalgrideso.com/industry-information/codes/code-changes-beginners-guide

What is the Security and Quality of Supply Standard (SQSS)

The Security and Quality of Supply Standard (SQSS), are the minimum design standard used to plan the transmission system. These standards ensure that any connection or system upgrades are to a high quality, and preserve the safety and reliability of the transmission system.

Understanding your connections project

How long will my connection take?

Your project’s timeline is unique as it is dependent on its location, the design selected, and what other projects are taking place in the area.

Our Connections team consider different factors that can influence how long it takes to connect your project to the transmission network. These include the complexity of the project, the connection site, the availability of outages and resource to do the work, and other contracted customer requirements. When considering your connection date we need to ensure that we can maintain the integrity and resilience of our transmission network and undertake any maintenance or upgrade work required. 

For timelines around certain connections regions, visit our Research Assistant

What is a Customer/User Self Build Agreement?

For the full information on User Self Build Agreements, visit our page here: https://www.nationalgrid.com/electricity-transmission/connections/article/user-self-build-agreements

Why are certain substations full?

Certain substations may be full as they cannot be expanded due to physical, geographical or system limitations. For more information on expanding and triggering new substations, visit here: https://www.nationalgrid.com/electricity-transmission/connections/article/substation-expansion-and-creation

To find out more about substation capacity, visit our Research Assistant

Which region should I connect in?

We encourage our customers to visit our Research Assistant to get the most up to date information about each connections region in England and Wales. Please take the time to research in depth before progressing with your connection.

How much will my connection cost?

Short term transformations and long term reforms

Two step offer update

For more information on two step offers, and the recent changes to the process, please visit here: https://www.nationalgrideso.com/news/update-two-step-offers-process-connections


What is the current process for pre applications?

Whilst the two-step offer period was underway- National Grid Electricity Transmission and the Electricity System Operator paused pre application meetings in England and Wales. This was to enable the focus of resources on other initiatives across the industry. Now the two-step offer process has concluded, ESO and NGET have recently been assessing both customer engagement and feedback on the regional webinars, to consider next steps.  


Feedback from customers was that they value the webinars, and our colleagues were able to share messages effectively and concisely. Some key feedback received from customers was the need for access to all previous recordings of webinars, so they will now be available through the ESO website. 


To ensure that updates can be provided that better reflect the current network picture whilst continuing to add value for customers, webinars have been moved to a quarterly frequency. Dates and times can be found on the ESO Connections website along with recordings of previous webinars here, under regional webinar materials. 


Whilst we wish to continue the webinars in a way that ensures the highest value for customers, we also recognise that queries can arise at any time.  


Therefore, in between these webinars, customers with a ESO portal account will be able to ask specific questions. This will mean that customer questions are picked up in between webinars and answered by ESO and NGET colleagues. Please also ensure you are using the ESO portal to submit any commercially sensitive questions, or questions which cannot be answered via previous regional webinar recordings or NGET’s Research Assistant tool.  Your questions can be submitted via the pre-application process in the portal, and they will remain confidential. 


What is Queue Management?

National Grid ESO has proposed a change to the industry rules to introduce ‘queue management’. 

National Grid Electricity Transmission (NGET) has supported the ESO’s development of its proposal, and we strongly advocate for its introduction as soon as possible. Ofgem has approved this new modification, and the process of implementation has begun.

The proposed new way of working will require customers developing projects to meet key milestones at various points of their connection journey. Where these milestones are not met, stalling projects will have to make way for other projects further back in the queue that are ready to proceed.

For more information, visit this page: https://www.nationalgrideso.com/industry-information/connections/queue-management

Transmission Works Review

NGET are working to continue the full transmission works review (TWR). This is in progress, and our teams are conducting assessments across the network. We understand that this process is taking longer to complete than originally expected, however- this further time is necessary to ensure results are aligned with the rapidly changing connections landscape.  As this process continues, any potential for acceleration of viable projects will be considered, and customers communicated with accordingly.

What was the TEC amnesty?

Not all the projects in the connection queue are able to proceed with their connection (for example, there may be no prospect of getting planning permission). However, for several reasons, they may not want to leave the queue. One of those reasons is the cost to reduce Transmission Entry Capacity (TEC) or terminate a connection agreement; these are known as cancellation charges. The TEC amnesty looked to temporarily remove this barrier.

It was an opportunity for customers in the connection queue to relinquish some or all of their future TEC that they could not or did not wish to use. The amnesty allowed customers to do this without having to bear some or all of the costs (e.g. cancellation charges) associated with reducing TEC or terminating their connection agreement. The requests that were made during the amnesty are currently being assessed to check against network planning and security via the ESO. If it is agreed to allow a project to relinquish TEC, it may enable other customers further back in the connection queue to proceed and get an earlier connection date.

What is Connections Reform?

In England and Wales, the total capacity of customer projects seeking connection currently stands at 343GW and is continuing to grow at an accelerated rate. This is leading to customers who are entering the pipeline with new projects receiving connection dates that are much later than when they would like to connect.  Therefore, reform of the connections arrangements is a key priority for the energy industry.

Tactical change is underway to begin addressing immediate and longer term issues within the pipeline. NGET is playing a leading role in delivering these changes alongside the ESO, and other industry colleagues.

For more information visit this page: https://www.nationalgrid.com/electricity-transmission/future-of-connections

What is the new BESS policy?

One of the key areas in the ESO’S five point plan was to change the way that batteries are dealt with in the connections landscape. The revised policy has now been released by the ESO and means that certain customer BESS projects can be considered for acceleration. For more information, visit the ESO policy page here: https://www.nationalgrideso.com/document/281171/download