Industry snapshot
Key public data points
Historical & forecast
Base year 2025. Each series is official through its own latest government-data year (shown in the legend on each chart), and years beyond that are Claight estimates. As of July 2026 the current year is still in progress (2026 annual data is not yet published), so the forecast runs to 2030.
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Connect to an analyst →Industry Definition and Scope
What does the Electricity Transmission in the UK industry cover?
The industry encompasses the operation, maintenance, and structural development of high-voltage onshore and offshore electricity transmission assets. These assets primarily operate at voltages of 132kV, 275kV, and 400kV to deliver electricity efficiently over long distances. The scope includes overhead lines, underground cables, substations, and subsea interconnectors linking Great Britain to international grids.
- •Covers high-voltage electrical infrastructure across England, Wales, and Scotland.
- •Includes the asset ownership of physical networks and technical grid reinforcement.
- •Excludes low-voltage regional distribution grids, which operate separately under regional operators.
Market Structure and Operators
Who operates in the industry and how is it structured?
The market operates as a regulated natural monopoly structured geographically among three main transmission owners. In England and Wales, asset ownership is held by a single entity, whereas Scotland is divided into two distinct transmission license areas. In late 2024, system coordination and planning were structurally separated from asset owners and transitioned to a state-owned independent entity.
- •National Grid Electricity Transmission plc (NGET) owns the network in England and Wales.
- •SP Transmission plc (part of SP Energy Networks) operates in southern Scotland.
- •Scottish Hydro Electric Transmission plc (operating as SSEN Transmission) operates in northern Scotland.
- •The National Energy System Operator (NESO) acts as the independent system balance coordinator.
Demand Drivers
What drives demand in the industry?
Demand within the industry is primarily driven by the systemic shift toward nationwide electrification and the geographical redistribution of power generation. As industrial sectors, domestic heating, and transport decarbonize, total electricity load requirements are scaling significantly. Additionally, connecting massive new offshore wind developments in remote coastal locations requires localized transmission reinforcement.
- •The shift toward electric vehicle (EV) charging infrastructure and heat pump integration.
- •The target to connect over 71 GW of new capacity by 2050 to avoid network constraints.
- •Industrial decarbonization across cement, steel, and chemical plants requiring high-capacity connections.
Competitive Landscape and Notable Public Companies
Who are the notable companies in the industry?
Because transmission licenses represent natural monopolies, direct corporate competition within geographic zones does not occur. Instead, competition manifests through capital allocation, competitive bidding for offshore transmission owner (OFTO) licenses, and regulatory benchmarking. The primary corporate groups active in this space are large, publicly traded utility consortia and multinational infrastructure operators.
- •National Grid plc is the largest listed utility holding company, controlling the English and Welsh networks.
- •SSE plc owns and operates the north of Scotland transmission license through its SSEN subsidiary.
- •Iberdrola SA operates the south of Scotland transmission network via its subsidiary Scottish Power UK plc.
- •A Balfour Beatty plc joint venture frequently competes for and executes multi-billion pound grid reinforcement projects.
Recent Trends and Outlook
What are the recent trends and outlook?
The industry is experiencing an unprecedented surge in capital expenditure targeted at updating legacy infrastructure and reducing grid connection backlogs. A key focus is alleviating transmission bottlenecks between Scotland's high wind generation regions and England's high demand centers. Furthermore, regulatory frameworks are evolving to accelerate connection queues for projects that optimize grid congestion.
- •Substantial capital deployment into subsea High Voltage Direct Current (HVDC) links like the Eastern Green Link projects.
- •Implementation of a new network congestion-optimized grid connection queue system by NESO in 2025.
- •Ongoing evaluation of a transition from national uniform pricing to Zonal Pricing under the Review of Electricity Market Arrangements (REMA).
Regulation and Compliance
How is the industry regulated?
The industry is heavily regulated by the independent British regulator to protect consumers while ensuring sufficient investment. Operators are bound by strict revenue caps and performance outputs dictated through multi-year price control frameworks. In addition, all active network licensees must adhere to uniform data transparency and risk assurance rules.
- •Regulated by the Office of Gas and Electricity Markets (Ofgem) through the RIIO (Revenue = Incentives + Innovation + Outputs) price controls.
- •Compliance with the Data Assurance Guidance (DAG) updated by Ofgem in January 2025.
- •Mandatory adherence to statutory emission reduction targets set out under the UK Climate Change Act.
Sources
Government, statistical and trade sources used for this Claight analysis.
- Department for Energy Security and Net Zero (DESNZ) 2025 ·
- Office of Gas and Electricity Markets (Ofgem) Data Assurance Guidance 2025 ·
- National Energy System Operator (NESO) 2025 Outlook ·
- UK Standard Industrial Classification (SIC) 2007 System
Claight analysis of public industry data.