Electricity domain
How GB energy flows
See how energy travels from generation through transmission and distribution networks to your home or business, across six interconnected layers of physical infrastructure, markets, and regulation.
Electricity network
Transmission at 275 kV and 400 kV, distribution at 132 kV down to 230 V, substations, pylons, and underground cables across England, Scotland, and Wales.
Gas system
National Transmission System, local distribution zones, terminals, storage facilities, and the role of gas in balancing and heating.
Connections
How generators, storage, demand, and interconnectors connect to the grid — queue management, offers, and the connections reform programme.
Digital infrastructure
Smart meters, data platforms, SCADA and control systems, and the digital tools that keep the physical network visible and controllable.
Methodology and sources
Last reviewed: 17 March 2026
This hub links to detailed pages on each layer of the GB energy system. Content drawn from NESO Electricity Ten Year Statement, National Gas system data, Ofgem connections reports, and Energy Digitalisation Taskforce publications.