Transmission connections are the superhighways of the electricity world. They are characterized by the large-scale movement of electricity at extra high voltage levels, from the point of generation to substations. These connections involve entities seeking to link with the extra high or high voltage transmission network, boasting connection voltages surpassing 132kV, up to 400kV.
The transmission network serves as the conduit for transporting electricity across the nation, from its generation hubs to its points of consumption. Across England, Wales, and Scotland, three Transmission Owners—National Grid Electricity Transmission, Scottish Power Transmission, and Scottish & Southern Electricity Networks (SSEN) Transmission—are entrusted with managing the national high voltage networks and transmission connections.
Diverse forms of large-scale generation and storage technology, such as wind farms, solar farms, battery storage, tidal power, nuclear- and gas-powered generators, directly connect to high voltage transmission networks. Interconnectors, facilitating the import and export of power between countries or connecting offshore wind farms, are also vital components of the transmission system.
Some users, particularly large industrial consumers, draw power directly from the transmission network. District Network Operators (DNOs) ensure effective operation by connecting their own users and maintaining local lower voltage networks, supplementing their supply by tapping into the transmission network.