What are regional energy price cap rates and why do they vary by postcode?

The UK energy price cap sets a maximum unit rate (p/kWh) and standing charge (p/day) for customers on default tariffs. These capped rates can vary by region because distribution network costs differ across the UK. Your postcode determines your supply region, which affects the capped electricity and gas rates you pay.

How do I find my cheapest regional price cap rates using my postcode?

Enter your postcode to identify your electricity and gas region, then compare the price-capped unit rates and standing charges for that region. Once you know your regional cap rates, you can compare them against fixed or variable tariffs to see if switching could reduce your bills.

Does the price cap mean my bill is capped?

No. The cap limits the unit rate and standing charge—not your total bill. Your actual cost depends on how much gas and electricity you use. Reducing usage or switching to a cheaper tariff (when available) can still lower what you pay.

What’s the difference between the unit rate and the standing charge?

The unit rate is what you pay for each kWh of energy you use. The standing charge is a daily fixed cost that covers things like maintaining the network and metering. Both vary by region and can significantly affect overall costs—especially for low-usage households.

Are regional price cap rates different for electricity and gas?

Yes. Electricity and gas have separate capped unit rates and standing charges, and both can vary by region. It’s common for electricity regional differences to be more noticeable due to distribution costs.

How often do price cap rates change?

Ofgem updates the energy price cap periodically (typically every quarter). When the cap changes, the regional unit rates and standing charges can change too. If you’re comparing tariffs, it’s worth checking the latest rates for your postcode region.

What if I’m on a fixed tariff—do regional price cap rates still matter?

If you’re on a fixed tariff, your rates are set by your contract rather than the cap. However, regional cap rates are still a useful benchmark: compare your fixed unit rates and standing charges to your regional cap to see whether you’re paying more or less than a typical capped tariff in your area.

Can I reduce my bill by switching even if the price cap applies?

Yes. The cap applies to default (standard variable) tariffs, but suppliers can offer deals below the capped level. By comparing offers for your postcode region and usage, you may be able to find a tariff with a lower unit rate, a lower standing charge, or both.

What information do I need to compare prices accurately?

For the best comparison, use your postcode (to identify the correct region) plus your estimated annual electricity (kWh) and gas (kWh) usage. If you don’t know your usage, you can use your recent bill or an estimate based on your household size and heating type.

How do I switch energy supplier with Energy Plus?

You can compare options for your postcode and choose a tariff that suits your home. Switching is typically handled by the new supplier, and your supply usually continues without interruption. Start by reviewing your regional capped rates and then compare available tariffs at https://www.energyplus.co.uk/.

Cheapest regional price cap rates by postcode (UK)

Find your Ofgem price cap region from your postcode, understand the unit rates and standing charges that apply, and see how to compare whole-of-market deals fairly.

Regional price cap rates vary by where you live (and can change by payment method & meter type).
“Cheapest” usually means lower unit rates and standing charges for your usage profile.
We show how to map postcodes to regions, what to check, and when a fixed tariff may still beat the cap.

Get your energy quote How postcode regions work

Figures on this page are guidance only. Your exact rates depend on your supplier, meter type and payment method. Always confirm rates on your tariff information label (TIL) or contract.

Fast answer: what are the cheapest regional price cap rates?

Under the Ofgem price cap, the rates you pay on a standard variable tariff (SVT) (and some default tariffs) are limited by a cap that varies by region. The “cheapest” cap region is simply the region with the lowest combination of unit rates and standing charges for the fuel(s) you use.

Important: your postcode tells you your distribution region, but it doesn’t guarantee you’ll get the very lowest cap rates you see online. Rates can differ by payment method (e.g. direct debit vs pay on receipt of bill), meter type (credit, prepayment, smart prepay), and fuel (electricity vs gas). Always compare using the pence-per-kWh unit rate + standing charge shown on your tariff information label.

Key takeaways (UK)

Postcode ? region affects the price cap rates you see on SVT/default tariffs.
For “cheapest”, don’t look at unit rate alone: standing charges can outweigh small unit-rate differences, especially for low usage households.
The cap limits what suppliers can charge on SVT/default tariffs, but it does not mean SVT is the best deal for your home.
If you have prepayment, Economy 7, or an older meter setup, the relevant cap/market options can be different.
To compare fairly, use your annual kWh (or a realistic estimate) and total cost over a year.

Compare tariffs using your postcode (and the cap region)

Enter your details to compare whole-of-market residential tariffs available for your home. We use your postcode to help identify the regional network area and show prices that are relevant to where you live.

Tip: For the most accurate comparison, have a recent bill to hand so you can check (1) whether you’re on gas + electricity or electricity-only, (2) your meter type (standard, smart, Economy 7, prepay) and (3) your typical annual kWh.

How postcode regions work (simple explanation)

1) Your postcode maps to a distribution region. Electricity (and gas) networks are split into regions (often aligned to historic supplier areas and network operators).

2) Ofgem sets cap levels by region. Cap rates differ because network costs and other regional factors vary.

3) You still choose a tariff as normal. Your supplier and tariff determine what you pay; the cap only limits certain default tariffs, not every deal.

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We’ll use your details to provide a comparison based on your location and needs. Switching is usually handled by the new supplier, with no change to your pipes or wires.

Renting? You can usually switch energy supplier if you pay the bills, even if you’re a tenant. If your rent includes bills, you typically can’t switch the supplier for that property.

What changes by region (and what doesn’t)

If you’re searching for the cheapest regional price cap rates, it helps to separate cap mechanics from your actual bill. This table summarises the differences that most often affect the total cost.

Item	Varies by postcode/region?	Why it matters	What to check
SVT price cap unit rate (p/kWh)	Yes	Even small differences can add up for higher usage homes.	Your tariff info label; confirm electricity vs gas rates.
SVT price cap standing charge (p/day)	Yes	Key for low usage households; you pay it regardless of consumption.	Standing charge for your payment method and meter type.
Payment method (Direct Debit / cash-cheque / prepay)	Often	Some tariffs are only available (or priced differently) for certain methods.	Your current setup and what you’re willing/able to use.
Meter type (credit, smart, Economy 7, prepay)	Indirectly	Affects available tariffs and (for Economy 7) day/night unit rates.	Whether you have multi-rate and how much you use overnight.
Fixed tariff pricing	Not tied to cap, but can still vary by region	A fixed deal can beat SVT in some regions/usage profiles, but check fees and term length.	Exit fees, end date, and whether rates are single- or multi-rate.

Decision checklist: is it worth chasing the “cheapest cap region”?

This guide suits you if…

You’re on an SVT/default tariff and want to sanity-check your rates against the cap for your area.
You’ve moved home and need to understand why your rates differ from your last address.
You want to compare fixed deals using the right regional assumptions.

It may not suit you if…

Your bills are included in rent/service charges (you generally can’t switch the property’s supplier).
You have a complex setup (e.g. multiple meters, embedded networks, heat network) where cap tables may not apply in the same way.
You’re comparing business energy (this page is for homes only).

Two realistic examples (with numbers)

These examples show how to compare total costs using unit rates and standing charges. They are illustrative only (rates vary by region, tariff, meter type and payment method). We’ve kept VAT at 5% out of the maths below to keep it easy to follow; suppliers usually quote domestic prices including VAT.

Scenario A: low electricity use (standing charge matters)

Assumptions: Electricity-only home, 1,800 kWh/year. Comparing two SVT-style rate sets.
Rate set 1 (Region X): Unit rate 25p/kWh, standing charge 60p/day.
Rate set 2 (Region Y): Unit rate 24p/kWh, standing charge 70p/day.
Estimated annual cost: Set 1: (1,800×£0.25)=£450 + (365×£0.60)=£219 ? £669
Set 2: (1,800×£0.24)=£432 + (365×£0.70)=£256 ? £688

Even with a lower unit rate, the higher standing charge makes Set 2 cost more for a low-usage household.

Scenario B: higher dual-fuel use (unit rate matters more)

Assumptions: Dual fuel: electricity 3,100 kWh/year and gas 12,000 kWh/year.
Tariff A (fixed deal): Elec 23p/kWh + 55p/day; Gas 6.0p/kWh + 30p/day; exit fee £75 per fuel.
Tariff B (SVT-style): Elec 25p/kWh + 60p/day; Gas 6.5p/kWh + 32p/day; no exit fees.
Estimated annual cost (excluding any exit fee): A: Elec (3,100×£0.23)=£713 + (365×£0.55)=£201 ? £914
Gas (12,000×£0.060)=£720 + (365×£0.30)=£110 ? £830
Total A ˜ £1,744
B: Elec (3,100×£0.25)=£775 + (365×£0.60)=£219 ? £994
Gas (12,000×£0.065)=£780 + (365×£0.32)=£117 ? £897
Total B ˜ £1,891

Tariff A looks cheaper on usage, but you should only choose it if the term length and exit fees suit your plans.

How to use the examples: swap in the unit rates and standing charges for your tariff(s) and your annual kWh from a bill. If you don’t have annual kWh, multiply a typical month by 12 as a rough check (seasonal usage varies, especially for gas).

Costs, exclusions and common pitfalls (UK)

If you’re trying to find the “cheapest” regional cap rates, these are the issues that most often cause confusion or unexpected costs.

1) Confusing the cap with a guaranteed bill

Ofgem’s cap is set using typical consumption examples, but your bill depends on your usage. A “cheaper cap region” doesn’t guarantee a lower bill if your standing charge is higher or you use more energy.

2) Not checking meter type (especially Economy 7)

Economy 7 has separate day/night rates. If your usage isn’t shifted overnight, a single-rate tariff may be better. Always compare using the right meter setup.

3) Missing exit fees on fixed deals

Some fixes include exit fees per fuel. If you plan to move, might need flexibility, or expect better deals soon, weigh savings against the fee risk.

4) Payment method differences

Some suppliers price differently for direct debit vs paying on receipt of bill. If you can’t (or don’t want to) pay by direct debit, filter your comparison accordingly.

5) Assuming postcode = supplier region name

Region names can vary across tools (legacy supplier areas, DNO regions, Ofgem wording). What matters is that your comparison uses the correct regional rate set for your MPAN/MPRN area.

6) Prepayment and smart prepay specifics

Prepayment customers can have different cap levels and product availability. If you’re considering moving from prepay to credit meters, check supplier eligibility and any process steps.

Quick self-check: Your current unit rates and standing charges are on your bill or in your online account. Compare those numbers directly, rather than relying on headlines about the “average price cap”.

FAQs

Does the Ofgem price cap mean my bill is capped?

No. The cap limits the unit rate and standing charge (and related elements) on SVTs and certain default tariffs. Your bill still depends on how much energy you use.

Why do price cap rates vary by region?

Regional variation largely reflects differences in network costs and how electricity is distributed. Ofgem publishes cap levels by region, which is why postcode matters when viewing cap rate tables.

Can I change my price cap region by switching supplier?

No. Your region is based on where your property is located and the network area it sits in. Switching supplier can change your tariff and rates, but not the underlying region.

I’m on Economy 7. Do regional cap rates still apply?

Yes, but you need the cap information relevant to multi-rate tariffs (day/night rates) and your meter type. When comparing, make sure you’re not comparing single-rate figures against Economy 7 rates.

Does the cap apply to fixed tariffs?

Not in the same way. Fixed tariffs are not capped by the SVT price cap structure, though suppliers still have to follow rules and provide clear information. A fixed tariff can be above or below SVT depending on market conditions.

Are standing charges capped too?

Yes, the cap framework includes standing charges for SVTs/default tariffs. However, the level can vary by region and payment method, and some tariffs can have different standing charges.

What if my postcode covers more than one network area?

Some postcode areas can be close to a boundary. The accurate way to confirm is via your supply identifiers (electricity MPAN region and gas MPRN details), which your supplier can confirm. A comparison form using postcode is a good starting point but may refine results when meter details are confirmed.

I’m in Northern Ireland. Does this page apply?

This page is written for Great Britain where Ofgem regulates the default tariff cap. Northern Ireland has a different market structure and regulator, so cap figures and processes differ.

Trust, methodology and sources

Page details

Written by: EnergyPlus Editorial Team
Reviewed by: Energy Specialist
Last updated: March 2026

How we assess “cheapest regional price cap rates”

We interpret “cheapest” in a consumer-helpful way: the lowest estimated annual cost for a like-for-like setup, using:

Unit rate (p/kWh) and standing charge (p/day) for the relevant fuel(s).
Clear assumptions about annual kWh consumption (either user-provided or typical examples in our scenarios).
Consideration of payment method and meter type because they can change available tariffs and applicable cap levels.

Limitations: A postcode is a strong indicator of region, but edge cases exist (boundary areas; complex metering; embedded networks). Supplier pricing can also change, and cap levels are updated periodically. Always confirm your exact rates in your contract/TIL before switching.

Primary sources (UK)

We aim to keep this page current, but if you spot an update needed (e.g. cap period changes), please contact EnergyPlus support with the relevant source link.

Ready to compare energy prices for your postcode?

See tariffs available for your home and compare estimated costs using the rates that apply in your region. No obligation — just clear options and key details like unit rates, standing charges and exit fees.

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Reminder: Prices are estimates and availability varies. If you’re in debt or on a specialist meter, options may differ — we’ll help you understand what applies.

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Updated on 14 Mar 2026