Energy unit rate by UK region 2026: every postcode area ranked

The Ofgem default tariff cap is set quarterly across 14 Great Britain regions, with separate unit rates and standing charges for electricity and gas in each. Northern Ireland sits outside the cap entirely and is regulated by the Utility Regulator under a different framework. The Q2 2026 cap (1 April to 30 June 2026) is the live reference quarter as of the sprint date in May 2026. Q3 2026 is announced on or around 27 May 2026 by Ofgem and takes effect from 1 July 2026.

How the Ofgem cap is regionalised

The default tariff cap, introduced under the Domestic Gas and Electricity (Tariff Cap) Act 2018, sets a maximum total bill for a typical-consumption household on a standard variable tariff. The cap is recalculated quarterly. The cap is regionalised because energy networks and policy costs are different across the country, and Ofgem's methodology (version 14, effective from Q2 2026) splits the country into 14 cap regions for electricity and 13 cap regions for gas (Northern Scotland and Southern Scotland are merged for gas). The cap is expressed in two pieces: a unit rate in pence per kilowatt-hour and a standing charge in pence per day. Every supplier offering a standard variable tariff is bound by the cap. Fixed-deal tariffs sit outside the cap and can price higher or lower than it. The figures below are ballpark direct-debit rates anchored to the Q2 2026 cap. Verify the current quarter cap on ofgem.gov.uk before quoting any specific figure for a specific consumer use.

The 14 GB regions: electricity unit rate and standing charge

South Western (which covers Devon, Cornwall, Somerset, and parts of Wiltshire and Dorset) tends to sit at the top of the unit-rate league table because of network costs and the lower customer density of the South Western Electricity Distribution licence area. London tends to sit near the bottom on standing charges but slightly above average on unit rate.

The 13 GB regions: gas unit rate and standing charge

Gas standing charges are much flatter across regions than electricity standing charges because the National Gas Transmission charges and the regional Gas Distribution Networks (Cadent, Northern Gas Networks, Wales and West Utilities, SGN) use a more standardised charging framework.

How to find which region a postcode sits in

Every UK postcode maps to a specific electricity distribution licence area and a specific gas distribution licence area. The first letters of the postcode usually give it away (LS for Yorkshire, ME for South Eastern, EX for South Western), but the boundaries are not perfect. Ofgem publishes a postcode lookup; the National Energy System Operator publishes the official electricity licence-area map; and supplier sites all show the regional rate the household sits in once a postcode is entered.

The catch is that some postcodes straddle network boundaries. A property on the border between SP Manweb (Merseyside and North Wales) and Scottish Power Distribution (Southern Scotland) can be in either depending on the actual feeder. Always go by the supplier's confirmed region after a recent bill rather than by the postcode prefix alone.

Northern Ireland: a separate market

Northern Ireland is regulated by the Utility Regulator (UREGNI) based in Belfast. It does not use the Ofgem price cap. Tariffs are approved supplier-by-supplier under a price control framework. The main domestic suppliers are:

• Power NI (electricity)
• SSE Airtricity (electricity and gas)
• Firmus Energy (gas)
• Click Energy (electricity)
• Budget Energy (electricity)

Power NI's domestic electricity tariff approved by the Utility Regulator for the 2025-26 charging year placed the standard unit rate at around 26.5p/kWh and the daily standing charge at around 47p, broadly in line with the GB cap but set through a different process.

Gas is structurally different in Northern Ireland. The natural gas network covers much of Belfast, the Greater Belfast area, and "Ten Towns" served by Firmus. Many rural and western Northern Ireland households remain off-grid and rely on heating oil or LPG, with no equivalent cap regulation.

What drives the regional spread

Three components dominate regional variation:

1. Distribution Use of System charges (DUoS). Set by each DNO under price control RIIO-ED2 (April 2023 to March 2028). Higher-cost networks (SP Manweb, SSEN Distribution Hydro) feed higher DUoS into the standing charge.
2. Transmission Network Use of System charges (TNUoS). Set by National Grid ESO; geographically zonal. Northern Scotland and Mid-Wales pay more in transmission charges than London.
3. Losses adjustment factors. Networks with longer distribution distances incur more line losses, which feed into the unit rate.

In practice the highest combined cost regions are Merseyside and North Wales, Northern Scotland, and South Western. The lowest combined cost regions are London, Eastern, and Yorkshire. The spread between top and bottom for a typical-consumption dual-fuel direct-debit household sits in the range of £150-£200 per year under the Q2 2026 cap.

How the cap regions map to real postcodes

The 14 cap regions are defined by electricity distribution licence area, not by political or administrative boundary. The mismatch sometimes catches households out. A few worked examples:

• Hereford and Worcester sit in the Midlands cap region, served by National Grid Electricity Distribution's East Midlands licence area for some postcodes and South Wales licence for others on the western fringe.
• Sheffield sits in the Yorkshire cap region under Northern Powergrid Yorkshire's licence.
• Carlisle sits in the Northern cap region under Northern Powergrid North East's licence, despite its proximity to the Scottish border.
• Bangor and the rest of Anglesey sit in the Merseyside and North Wales cap region under SP Manweb's licence, with the highest electricity standing charges in the GB cap as a result.
• The Isle of Wight sits in the Southern cap region under Scottish and Southern Electricity Networks Southern licence.
• The Isles of Scilly are part of the South Western cap region under National Grid Electricity Distribution's South West licence.

The same applies for gas, with the 13 cap regions mapping to the four Gas Distribution Networks: Cadent (covering large parts of England), Northern Gas Networks (the North East and parts of Yorkshire), Wales and West Utilities (Wales and the South West), and SGN (Southern England and Scotland).

Standard credit and prepayment caps, separate calculations

The figures in the tables above are direct-debit cap rates. Ofgem also publishes:

• Standard credit cap (customers paying by cash or cheque on receipt of bill). Historically higher than direct debit; since 2024 the gap has been recovered through a fixed daily charge adjustment under the Ofgem decision on debt-related cost recovery.
• Prepayment meter cap (PPM). Aligned roughly with the direct-debit cap since the Energy Price Guarantee adjustments worked through in 2023, but the methodology component for prepayment-specific operating costs sits separately.

In practice the spread between direct-debit and other payment-method caps is small but not zero. A direct-debit dual-fuel typical-consumption household saves roughly £20-£40 a year compared to a standard credit household at the same consumption profile.

What Q3 2026 is likely to do to the picture

Cornwall Insight's April 2026 forward cap forecast publication signalled a modest cap movement for Q3 2026, with wholesale gas (TTF) and UK NBP futures softening through the spring. Whether the regional ranking changes much depends on whether Ofgem's network charge updates (which feed standing charges) land within the same quarter as the wholesale repricing. The headline regional ranking is sticky; the absolute figures move quarterly.

On the ground, the practical takeaway is that the cap region a household sits in is a structural input, not a tariff choice. A household cannot move to a cheaper cap region without physically relocating. What it can do is shift onto a tariff structure that suits its consumption profile: a fix with no exit fee in a low-volatility period, a tracker tariff if the household has flexibility, or the standard variable cap when the wholesale outlook is favourable.

Frequently asked questions

Why does my supplier's rate differ from the cap rate?

Suppliers may price below the cap for marketing reasons (loss-leader fixed deals, social tariffs) or above the cap on fixed deals where they hedge against future cap rises. The cap is a maximum for default variable tariffs only.

Are prepayment meter rates different?

Yes. Ofgem's prepayment meter cap is set separately from the direct-debit cap and standard-credit cap. Since the Energy Price Guarantee adjustments in 2023, the prepayment cap has been aligned roughly with the direct-debit cap, but the underlying methodology is still distinct.

Where can a household see its current regional rate?

On any recent bill or annual statement, in the rates section. Suppliers must show the per-kWh unit rate and the per-day standing charge separately. Ofgem also publishes the cap rates for every region every quarter on ofgem.gov.uk.

Why is Northern Ireland not on the same table?

Northern Ireland's energy market is regulated by the Utility Regulator and is not part of the Ofgem default tariff cap framework. Tariffs are approved individually for Power NI, SSE Airtricity, Firmus Energy, Click Energy, and Budget Energy.

How often do the regional rates change?

Quarterly. Ofgem sets the cap four times a year: Q1 (1 January), Q2 (1 April), Q3 (1 July), Q4 (1 October). Each cap announcement comes around six weeks before the cap takes effect.

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