Current figures — last updated 2026-06-25
Sources: Ofgem RIIO-T3 Final Determinations (Dec 2025); NESO constraint-cost data 20253
transmission owners in Great Britain
~22%
of an electricity bill is network costs
~£1.46bn
spent on wind constraints in 2025
£28.1bn
RIIO-T3 transmission investment, 2026–2031
The belief most people hold (and why it is backwards)
Most people assume pylons are an eyesore we would be better off without, and that the grid is basically finished, just sitting there moving power. Both assumptions are wrong, and believing them costs you money.
Britain built its transmission network for a world of big coal and gas stations sitting near cities. That world is gone. The cheap power now comes from wind in Scotland and the North Sea, far from where people live. The grid was never built to carry that much power that far south. So when the wind blows hard, there is more clean electricity than the wires can move, and something has to give.
What gives is the wind farm. The grid operator pays it to stop generating, then pays a gas plant in England to start, because gas sits closer to demand. We pay twice for one unit of power. In 2025 that double payment came to roughly £1.46 billion, and 98% of the curtailed wind was in Scotland. The fix is more pylons. The thing people fight is the thing that would make their bills cheaper.
Why most "transmission" guides get it wrong
Type "electricity transmission" into a search engine and you get one of two things: a dictionary definition ("transmission moves electricity at high voltage"), or a page about the National Grid share price. Neither helps you understand your bill or a power cut.
The definition is true but useless, because it stops exactly where the interesting part begins. The share-price content is about a listed company, not the physical wires. This page is about the wires: who owns them, why their condition decides what you pay, and who you actually contact when something goes wrong (spoiler: never the transmission owner).
Who owns the National Grid and the transmission network
There is no single "National Grid" that owns everything. The high-voltage transmission network in the UK is split between three regional monopoly owners, all overseen by the regulator Ofgem and all directed in real time by the system operator, NESO. Click an owner to read its full guide.
England and Wales
National Grid Electricity Transmission
also called NGET
The largest transmission network in Britain. A listed company (National Grid plc).
Read the guideSouthern Scotland
SP Transmission
also called SPT
Part of SP Energy Networks (ScottishPower / Iberdrola). Carries power south to the border.
Read the guideNorthern Scotland
SSEN Transmission
also called SHE Transmission
Part of SSE. The Highlands and Islands: huge wind potential, tiny local demand.
Read the guide| Region | Transmission owner | Parent group |
|---|---|---|
| England and Wales | National Grid Electricity Transmission | National Grid plc |
| Southern Scotland | SP Transmission | SP Energy Networks (Iberdrola) |
| Northern Scotland | SSEN Transmission | SSE plc |
Northern Ireland is a separate system: see the NI electricity network, owned by NIE Networks and run by SONI.
How power reaches you: the transmission network in three steps
UK electricity passes through three layers before it reaches your kettle. The transmission network is the first one.
-
1
Transmission: the motorway
Tall steel pylons carry bulk power at 132–400 kV across long distances. Owned by the three transmission owners. This is the "national grid" people picture.
-
2
Distribution: the local roads
Your regional distribution network operator (DNO) takes power off the motorway, steps the voltage down and runs it through local cables to your meter. The DNO fixes power cuts.
-
3
Supply: your bill
A licensed supplier buys the power, pays transmission and distribution charges, and bills you. The supplier is the only link you can switch.
What does the grid actually cost you?
Enter what you spend on electricity a year. The tool shows how much pays for the wires (the transmission and distribution networks) and your rough share of the constraint waste, the money spent switching Scottish wind off. Live grid mix is pulled from the free Carbon Intensity API (NESO / National Grid); if it is unavailable, a sensible default is shown. Every number it produces is also in the table below.
A rough figure is fine. The typical UK home spends about £900 a year on electricity.
Or pick your home type:
Assumptions: network costs ≈ 22% of an electricity bill (transmission ≈ 4%, distribution ≈ 18%); constraint cost ≈ £1.46bn (2025) ÷ ~28m UK households. Estimates for illustration, not a quote.
Your grid bill, revealed
£/yr
goes to the wires that carry your power
Transmission (pylons)
£
Local distribution
£
You also pay about £ a year for constraint waste, the money spent switching Scottish wind off. More pylons would cut this.
| Part of your electricity bill | Share | What it pays for |
|---|---|---|
| Wholesale energy (the power itself) | ~38% | What your supplier pays to buy the electricity. |
| Network costs (transmission + distribution) | ~22% | The wires. Transmission is the smaller slice (~4%); local distribution is the bigger one (~18%). |
| Policy and social schemes | ~16% | Renewables support, social and efficiency programmes. |
| Operating costs, VAT and supplier margin | ~24% | Running costs, 5% VAT and profit. |
Shares are rounded estimates of a typical 2026 GB electricity bill and shift with wholesale prices. Transmission is the smaller part of the ~22% network slice.
Electricity pylons: the consumer question nobody answers honestly
People search "electricity pylons uk", "living near pylons", "do pylons cause cancer". Here is the straight answer and the part that matters for your wallet.
The health question
UK and international health reviews have found no proven risk from living near high-voltage lines. The magnetic field drops fast with distance and stays within safety limits at the edge of the line. Property value, not health, is the usual real-world concern.
The money question
Here is the twist. Local opposition slows new pylons down for years. Meanwhile the grid stays too weak to carry Scottish wind south, so we keep paying ~£1.5bn a year in constraint costs. Blocking pylons does not make that go away; it spreads it across everyone\'s bill.
The insider insight: you pay for the bottleneck twice
Here is the mechanism that almost no consumer guide explains. When too much Scottish wind hits a grid that cannot carry it south, NESO runs two payments at once:
Payment one: the Scottish wind farm is paid to switch off (it loses its sale, so it is compensated). In 2025 this came to about £380 million.
Payment two: a gas plant nearer England is paid to switch on to replace that power. In 2025 this came to about £1.08 billion.
So one missing transmission line means you fund clean power you never receive and dirtier power you did not need. The entire £28.1bn RIIO-T3 transmission programme (2026–2031) is largely about closing this gap. The behavioural trap: the cost is invisible (buried in the unit rate), so nobody protests it, while the visible thing (a new pylon) gets fought, which keeps the invisible cost flowing.
What you can actually do
Be honest about what is in your control. You cannot switch transmission owner, and you cannot stop constraint costs as an individual. Two things genuinely help your bill:
- Switch the part you can switch. The supplier is the only link in the chain you control. Comparing tariffs is the one move that changes your unit rate.
- Shift usage to when the wind blows, if you can. A time-of-use tariff rewards using power off-peak, which is often exactly when cheap wind would otherwise be switched off.
- For a power cut, call 105, never the transmission owner. 105 routes you to your local DNO, the company that owns the cable to your home.
Find your cheapest electricity tariff
You cannot switch the network or the system operator, only your supplier. That is the one lever that changes your bill. Compare every live UK tariff, cheapest first.
Cheapest live rate now: British Gas at 23.85p/kWh, about 3% below the 24.67p cap.
The bottom line
Electricity transmission is the invisible motorway your power travels on, owned by three regional monopolies you can never switch. It matters because Britain does not have enough of it: the Scotland-to-England bottleneck quietly adds roughly £1.5 billion a year to bills. The £28 billion being spent on new pylons through 2031 will add a little to network charges now, but is designed to cut the far larger constraint waste later. The pylons are not the problem. The missing pylons are.
Electricity transmission: your questions answered
Electricity transmission is the high-voltage part of the grid: the big steel pylons and lines running at 132,000, 275,000 and 400,000 volts that carry bulk power long distances, from power stations and wind farms toward the cities and regions that use it. Think of it as the motorway network for electricity. The lower-voltage distribution network is the local roads that take power the last mile to your home.
Three companies own the high-voltage transmission network. National Grid Electricity Transmission owns it in England and Wales. SP Transmission owns it in southern Scotland and SSEN Transmission in northern Scotland. The body that runs the grid in real time across Great Britain is NESO, which has been publicly owned since 2024. No transmission owner sells electricity to homes.
It depends on size. The tall steel lattice pylons carrying 275 kV or 400 kV belong to a transmission owner (National Grid, SP Transmission or SSEN Transmission). The smaller wooden or steel poles on your street belong to your local distribution network operator (DNO). If a line is down or sparking, you do not need to know which: call 105 and the operator is found for you.
Public-health reviews in the UK have found no proven health risk from living near high-voltage power lines. The electromagnetic fields fall away sharply with distance and stay within international safety limits at the edge of the line's easement. The bigger, real cost of pylons is not health: it is that Britain does not have enough of them, which forces wind farms off and pushes up bills.
Because the cost is built into the price your supplier charges. Network charges are about 22% of a typical electricity bill; transmission is the smaller slice of that. On top of that you pay constraint costs, roughly £1.5 billion a year in 2025, to switch off Scottish wind the grid cannot carry south. You never see a transmission line item, but it is in the unit rate.
No. The transmission network is a regulated monopoly: one owner per region, set by your geography, overseen by Ofgem. You cannot switch network. The only part of the chain you can switch is your supplier, which is where any saving on your bill comes from. Compare electricity tariffs to change that part.