Gas Transportation Charges Explained: NTS and LDZ Costs on Your Bill

How the National Transmission System and Local Distribution Zone charges work, why they vary by region, and why they are rising.

On an electricity bill, the cost of the wires is split between TNUoS and DUoS. Gas works the same way. Every unit you burn has to travel through two networks to reach your meter, and gas transportation charges pay for both, a large, and rising, slice of the non-commodity cost on your gas bill.

What Gas Transportation Charges Are

Every unit of gas your business burns has to be physically moved from where it enters the country to your meter, and someone has to pay for the pipes that carry it. Gas transportation charges recover the cost of building, maintaining and operating that pipeline network. They are the gas equivalent of the TNUoS and DUoS charges on your electricity bill: a non-commodity cost, set by regulated network companies rather than by the wholesale market, that applies whoever supplies you.

For most businesses transportation is bundled into the overall unit rate, but for larger sites it can appear as a distinct and significant line. Across a typical gas bill, transportation and the other non-commodity charges make up a substantial share of the total, often far more than customers expect, which is why understanding them is central to controlling cost. Our guide to non-commodity costs puts transportation in the context of the whole bill.

The NTS and the LDZ

Gas transportation happens in two stages, and your bill reflects both. The first is the National Transmission System (NTS), the high-pressure “motorway” network operated by National Gas Transmission that moves large volumes of gas around the country from terminals and storage sites. The second is the Local Distribution Zone (LDZ), the lower-pressure regional networks, run by the four gas distribution companies (Cadent, SGN, Northern Gas Networks and Wales & West Utilities), that take gas off the NTS and deliver it to homes and businesses.

Think of it as the same two-tier structure you see in electricity: the NTS is analogous to the transmission network behind TNUoS charges, while the LDZ is the gas version of the local distribution network behind DUoS charges. Your gas bill carries a share of the cost of both.

Why They Vary by Region

Because Britain is split into eight Local Distribution Zones, two otherwise identical businesses in different parts of the country can face noticeably different transportation charges. The cost of running each regional network, its length, the terrain, the number of connected customers, feeds into the charge, so location genuinely affects what you pay. Charges also depend on your consumption band and, for larger sites, on the capacity you book, which means how much gas you use and how you use it both influence the bill.

This regional and capacity-based structure is deliberate. Like electricity network charges, gas transportation charges are designed to reflect the real cost of serving a given site, and to signal where the network is under most pressure.

Why They Are Rising

Gas transportation charges are set within Ofgem’s price control framework, known as RIIO, which determines how much the network companies can recover from customers over each control period. You can read about how these controls work on Ofgem’s RIIO network price control pages. The pressure on charges is upward for a specific reason: as gas volumes across the country gradually fall with electrification and efficiency, the largely fixed cost of maintaining the pipeline network is spread across fewer units, pushing the per-unit charge up. In other words, even if your own consumption stays flat, the transportation rate you pay can rise simply because the national picture is changing.

What You Can Do About It

Transportation is not a charge you can avoid, but there are levers. First, make sure the charge is quantified, ask your supplier or broker to break transportation out of your all-in rate so you can see it clearly rather than having it buried in the unit price. Second, review your capacity and consumption bands: larger sites that book more capacity than they need, or that could shift into a more favourable band, may be paying more than necessary. Third, buy well. For larger or multi-site users, a flexible contract through energy procurement lets you manage non-commodity volatility rather than being locked to a single fixed all-in rate, and a competitive supply deal, covered in our guide to business gas deals, ensures the commodity element is not adding to the pain.

What This Means for Your Business

Gas transportation is one of the largest non-commodity elements of a business gas bill, it varies by region and consumption in ways that reward careful management, and the underlying trend is upward as falling national gas demand spreads fixed network costs across fewer units. For larger and multi-site users in particular, understanding the NTS and LDZ components, and structuring your buying around them, is a meaningful part of managing total gas cost.

If you want to know exactly how much of your gas bill is transportation, and how it compares across your sites, our team can break it out and model the impact for you. Get in touch to speak to one of our energy consultants today.