Once you’ve researched your connection, and are ready to submit your application, visit the Electricity System Operator portal. This replaces the previous connection application form process.
Once the ESO have reviewed the application, it will be sent over to us. A specialised team including your dedicated Account Manager, Power System Engineers and Feasibility Engineers, will work with you to design your connection to the network. To do this, they will use industry standards, such as the Security and Quality of Supply Standard (SQSS), to ensure your connection offer is the most economic and efficient solution. Our Power Systems Engineers also undertake computer-based study work to assess the electrical impact of your connection on the network. Your application will follow the below series of studies.
Thermal studies: Determines power flow requirements
These studies calculate the current flowing through the power system, to ensure our assets have enough capacity to support your connection. All our assets have thermal ratings, so the study will show if an increased power flowdue to the new connection remains within the safe rating of that asset.
Voltage studies: Determines requirements for any additional reactive compensation devices
Voltage studies may be undertaken to examine any potential voltage instability, voltage control coordination, or to calculate voltage step changes. This will allow us to understand if any new voltage compensation measures alongside your connection may be needed in case of any instability on the network.
Fault level studies: Determines required rating of circuit breakers
These studies determine the size of the circuit breakers needed in line with your connection, to preserve the safety of the equipment should a fault occur. To calculate fault currents correctly, we replicate worst case scenarios to ensure the system can handle all fault conditions.
Stability studies: Determines any transient stability issues
This assessment looks at the ability of generators to remain stable under normal operating conditions and following a disturbance on the transmission system.
Once your connection design has been agreed, your Account Manager will collate all the relevant information into a contract which is then sent to the ESO and a connection agreement contract will be sent to you.
The period between the ESO sending the connections contract over to us, and us sending it back to ESO during which these processes happen is called a ‘clock start’. See the table below for more information on all the stages of the clock start process.
Key developments that take place after 'clock start'
Setting up your team
We'll put together your NGET core scheme team, which will support you throughout the connection process. This team will be made up of:
A power system engineer- conducts the system studies needed for your connection
Connection engineer- puts together a project program by bringing costs together, whilst verifying how to deliver the works.
Customer Account Manager- your first point of contact for all enquiries relating to NGET. They help manage your needs and requirements.
Revenue Analyst- Analyses the costs that will be incurred for your connection, to calculate charging elements appropriate and details them in the offer.
Customer Contract Manager- your ESO account manager will remain your primary ESO contact and will be present throughout the connections process.
The team will kick things off internally by running through your application so that we fully understand all of your connection requirements. If any questions arise these will be raised with you.
Analysing your connection requirements
Next, the system studies are carried out. These studies are conducted based on the data the user provides to us. It may comprise thermal studies, fault level studies, voltage studies and stability studies as outlined in the previous table. The depth of these studies is defined by the data the user provides.
Designing your connection
We will then set up an internal offer workshop. This takes into account the study results and determines the best design for your connection. The connection engineer will then develop your solution further, conducting desktop exercises to calculate relevant costs, designs, and programme. We'll contact you to update you with progress made plus initial views of what your offer may look like.
Drawing up your offer
Once this workshop is complete, we will call you to discuss our proposed offer. We will then hold an internal governance meetings, where we will seek approval to release our offer to the ESO, on your behalf. Following this, we will produce your Transmission Owner Connection Offer (TOCO), which is then sent to the ESO.
In the final 30 days of the process, the ESO will feedback on any amendments of the Transmission Owner Connection Offer (TOCO) NGET will aim to resolve these as soon as possible. Once this is complete, the user will receive their offer from the ESO.