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Transmission Connections

Roles Within Transmission Connections

SP Transmission (SPT)

SP Transmission is a Transmission Owner (TO). Whilst we retain ownership of our transmission assets, such as substations and transmission towers, we have a licence obligation to maintain, design, develop and deliver new or modified connections to our network.

National Grid Electricity System Operator (NGESO)

National Grid Electricity System Operator (NGESO) are the designated system operator (SO) in England, Scotland and Wales. As the SO, NGESO is responsible for ensuring the stable and secure operation of the whole transmission system. The SO is also responsible for balancing the electricity demand across the whole of Great Britain with electricity supplied by generating stations on a minute-by-minute basis. As the SO, NGESO provides transmission services to generators, electricity suppliers and large customers and will deal with all aspects of the contracts for the connection to and use of the electricity transmission system.

Heat Maps

Before we can connect you we have to make sure that our existing network is capable of providing the power you need to operate your equipment.

For smaller projects (smaller than or equal to 50kW) there is normally no need to worry about the capacity of our network but for larger projects we may need to carry out some work to connect your generator. We recommend that you engage with us at an early stage as it’s important that you are aware of the timescales and costs involved before you begin your project.

In advance of this we have a series of heat maps that will give you an indication of the networks capability and a better understanding of potential opportunities to connect your generator to the electricity network.

The Application Process

To read the application process explained, including connection offers and processes, please select the link below:

To read about connection registers, reports, policy updates, and industry guidance documents for understanding the connection process further, please select the link below:

Charging Statement

SPT is obliged, under Special Condition (SC) 8C of its electricity Transmission Licence, to prepare a statement approved by the Authority setting out the basis upon which charges will be made for the provision of transmission services in such form and detail as shall be necessary to enable NGET to make a reasonable estimate of charges to which it would become liable for the provision of SPT’s services. These services include the planning, development, construction, maintenance and operation of new and modified connections to the licensee’s transmission system.

Reinforcement Works

Find our quarterly report on reinforcement works within transmission below.

Transmission Connections Guidance Leaflet

The aim of this leaflet is to provide a plain English overview of the Transmission connections process.  If you have feedback or questions on this leaflet please send an email to

Transmission Owner Reinforcement Instruction (TORI) Quarterly Update Report

Our Transmission Owner Reinforcement Instruction (TORI) Quarterly Update Reports are available to download.  The documents are designed to update our Transmission system users and connecting parties, following feedback from our stakeholders. Please use the links below to access our reports. If you have any questions or feedback on the report, click here to email us.

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