The Great Britain Gas System

Most of what Britain does with energy still runs on gas. It heats the large majority of homes, and when the wind drops it generates a large share of the electricity as well. All of it moves through one national network of high-pressure pipes.

This page reads that network from the National Gas transmission feed: how much gas is entering the system, where it is coming from, what is taking it out again, and how much is sitting in the pipes.

What the gas transmission system is

Gas arrives in Britain at a handful of coastal entry points — landing terminals for offshore fields, import pipelines, and terminals where liquefied gas is shipped in and turned back into gas. From there the national transmission system carries it at high pressure to the places that need it.

Three kinds of customer take gas off that system. Local distribution networks step the pressure down and deliver to homes and businesses; large industrial sites and gas-fired power stations connect directly; and interconnectors export gas to Ireland and the continent. Every figure here describes that national layer, not the pipe into any particular building.

The current snapshot

The feed updates every couple of minutes, so this is close to a live view of the system rather than a daily summary.

How to read these figures

Four things will save you from misreading the tables above.

Where Britain’s gas comes from

Supply arrives by four routes, and the balance between them moves with price, season and what is available on any given day.

• British production. Gas from fields in UK waters, piped ashore at terminals around the coast. Output has been in long-run decline as the fields mature.
• Norwegian pipeline imports. A direct undersea link from a neighbouring producer, and the steadiest of the import routes.
• Liquefied natural gas. Gas chilled to a liquid, shipped in, and turned back into gas at coastal terminals. This is the flexible route: cargoes go wherever prices are highest, so LNG arrives when Britain is paying more than the alternatives.
• Continental interconnectors. Pipelines to Europe that run in both directions, importing in winter and often exporting in summer when British supply is comfortable.

The origin table above uses entry points only, and keeps sites it cannot classify visible rather than quietly folding them into a category. Where a figure is missing it is shown as unavailable, not as zero.

Linepack: the cushion in the pipes

Linepack is the one figure here that is not a flow, and it is the most useful thing on the page once you know what it is doing.

The network is pressurised, so the pipes themselves hold a substantial volume of gas. That stock acts as a buffer. Supply into the system is fairly steady across the day, while demand peaks sharply in the morning and again in the evening — the pipes absorb the difference, filling when supply exceeds demand and drawing down when it does not.

Which is why the direction matters more than the level. Falling linepack means the system is taking out more than it is putting in, and the shortfall has to be made up before the cushion runs thin. That is the signal the control room watches, and it moves well before anything appears in prices.

Why gas sets the electricity price

Gas and electricity are usually treated as separate bills. In the market that sets their prices, they are barely separable.

Britain’s wholesale electricity market pays every generator the price of the most expensive one needed to meet demand in that period. For a large share of the hours in a year that plant is a gas station, because wind and nuclear cannot be turned up on request and gas can. When the gas price moves, the electricity price moves with it — for the electricity generated from wind and nuclear too.

That is the mechanism behind a fact many households noticed the hard way after 2021: a gas crisis arriving as an electricity bill. Cold, still weather is the condition that pushes both at once, and you can watch how much of the mix gas is carrying at any moment on the live electricity page.

What this means for your bill

Nothing on this page changes what you pay this week. Wholesale movements reach households slowly, through a price cap that is set every three months on a period of past prices, or not at all if you are on a fixed tariff.

What it does explain is the shape of what arrives later. A sustained run of high system demand and tight supply feeds into the cap assessment that eventually sets the rate; a comfortable, mild period does the opposite. Neither is visible in a single reading, which is why the useful habit is watching the direction rather than the number.

If you want to know what any of this costs at your meter, our typical household energy use page has the consumption side, and the energy bill calculator turns it into money.