How does energy comparison work?

Energy comparison helps you review available UK gas and electricity tariffs based on your usage, payment method and preferences. You can compare prices, contract terms and features, then choose the tariff that best fits your household or business.

What information do I need to compare energy tariffs?

To get the most accurate results, have your postcode and either your annual energy usage (kWh) or a recent bill. It can also help to know your current supplier, whether you pay by Direct Debit or on receipt of bill, and if you want a fixed or variable tariff.

Can I compare electricity only, gas only, or dual fuel?

Yes. You can compare electricity-only tariffs, gas-only tariffs or dual-fuel options. Comparing dual fuel can be convenient, but it’s still worth checking whether separate gas and electricity deals would be better for your situation.

Will switching energy supplier interrupt my gas or electricity supply?

No. Switching supplier shouldn’t interrupt your energy supply. Your gas and electricity still come through the same network and pipes/wires; only the company billing you changes.

How long does it take to switch energy supplier in the UK?

Switching times can vary by supplier and tariff, but many switches complete within a few working days to a couple of weeks. Your new supplier will confirm the expected timeline after you apply.

Are there any exit fees for leaving my current tariff?

Some fixed tariffs include exit fees if you leave before the end of the contract, while variable tariffs often don’t. Check your current tariff terms or recent bill to confirm any charges before switching.

How do I know if a tariff is fixed or variable?

A fixed tariff typically locks in the unit rate and standing charge for a set period, while a variable tariff can change in line with the supplier’s pricing. The tariff summary and key terms will state whether it’s fixed or variable and the contract length.

Do I need my MPAN or MPRN to switch?

Usually you can compare and start a switch without these numbers, but having them can help match your supply more accurately. Your MPAN (electricity) and MPRN (gas) are typically shown on your bill.

What if I have a smart meter?

You can still switch with a smart meter. In most cases it will continue to work, though smart features may depend on the supplier. Your new supplier will advise what happens with your meter after you switch.

Is comparing energy tariffs free?

Yes, comparing energy tariffs is free. You can review options and decide whether to switch based on price, contract terms and features that matter to you.

Energy comparison in the UK: compare tariffs the right way

Compare gas and electricity prices across the market, understand what affects your quote, and switch with confidence — including fixed, variable and prepayment options.

Whole-of-market approach: compare based on your meter, usage and payment method
Clear explanations of unit rates, standing charges, exit fees and discounts
Practical UK guidance for renters, smart meters, Economy 7 and prepayment

Get your energy quote How energy switching works

Estimates only. Prices vary by region, meter type, usage and payment method. Switching is subject to supplier checks and tariff terms.

Fast answer: what energy comparison actually means

In the UK, energy comparison means checking your current gas and electricity costs against alternative tariffs (fixed or variable) by using your postcode region, meter type, payment method and (ideally) annual usage in kWh. The best option isn’t always the lowest unit rate — standing charges, exit fees, and how long prices are fixed can matter just as much.

Best time to compare

Any time. You can usually switch at any point; just check if your current tariff has exit fees and whether you’re within the final 49 days of a fixed deal (exit fees often don’t apply then).

What you need

Postcode, supplier name, and ideally your annual kWh for gas and electricity (from a bill or online account). If you don’t have kWh, we can use an estimate.

What “cheapest” should mean

Compare the estimated annual cost for your usage and payment type, then weigh up price certainty, customer service, and any tariff conditions (e.g., smart-meter requirement).

Key takeaway: In Great Britain, rates vary by region and meter type. Always compare like-for-like using kWh usage and your actual payment method (Direct Debit, credit, or prepayment) to avoid misleading results.

Compare energy deals with EnergyPlus

Use the form to get an estimated quote for your home and see suitable tariffs. We’ll ask for a few basics, then we can follow up with options that match your meter and circumstances.

What affects your quote

Where you live (postcode pricing region)
Meter type (standard, smart, Economy 7, prepayment)
How you pay (Direct Debit, cash/cheque, prepay)
Your usage in kWh (or an estimate)

Good to know

You won’t lose supply during a switch
Cooling-off period applies for most switches
Exit fees may apply on fixed tariffs (check terms)
Prices and availability change; quotes are time-sensitive

Tip: If you can, have a recent bill to hand. The most accurate comparisons use annual consumption (kWh) rather than monthly spend, because direct debits can be set higher/lower than your actual usage.

Get your energy quote

Tell us where you live and how to reach you. We’ll use this to share suitable options and next steps.

How energy switching works (UK)

1) Check your details

We’ll confirm whether you have gas, electricity or both, plus your meter type (e.g., smart, Economy 7, prepayment).

2) Compare like-for-like

We compare estimated annual costs using your usage (kWh where possible), including standing charges and any tariff conditions we know about.

3) Choose a tariff

Pick fixed for price certainty or variable for flexibility. We’ll highlight where exit fees may apply and when prices can change.

4) Switch without disruption

Your energy supply stays on. Your new supplier normally manages the switch and updates your opening meter reading.

Renting? You can usually switch if you pay the bills and your name is on the account. If your landlord includes energy in the rent, you typically can’t change supplier.

Compare tariff types (what to choose and why)

This table helps you decide between common UK tariff types. Exact features vary by supplier and region, so always read the tariff information and your personal quote.

Tariff type	Best for	Watch-outs	What to check before switching
Fixed (e.g., 12–24 months)	People who want predictable unit rates and standing charges for a set term.	May include exit fees. If market prices fall, you may pay more than new deals.	Exit fees, end date, whether the fix covers both unit rate and standing charge, and what happens at renewal.
Variable (incl. Standard Variable Tariff)	Maximum flexibility; typically no exit fees.	Prices can change. You’re exposed to rises (and falls).	How and when price changes are applied, and whether discounts are conditional (e.g., online-only).
Prepayment (PAYG)	Households who need pay-as-you-go budgeting or have prepay meters installed.	Fewer tariffs may be available. Topping up methods and support vary.	Whether your meter can be supported, top-up options, emergency credit rules, and any debt arrangements.
Economy 7 / multi-rate	Homes with night storage heaters or high overnight usage.	Day rate can be higher; savings depend on night-use percentage.	Your day/night split, the exact off-peak hours, and whether the tariff matches your meter configuration.
Smart-meter compatible (tariff condition)	People with a smart meter (or willing/able to have one installed).	Some tariffs require smart readings; if a meter can’t be installed, eligibility may change.	Meter compatibility, data sharing settings, installation availability, and what happens if smart readings fail.

Quick decision checklist

A fixed tariff may suit you if…: you prefer price certainty for budgeting and you’re happy to commit for the term.
A variable tariff may suit you if…: you want flexibility and you’re comfortable with prices changing.
Economy 7 may suit you if…: a meaningful share of your electricity use happens overnight (often with storage heating).
Prepayment may suit you if…: pay-as-you-go helps you manage spending or you already have a prepay meter.

Who energy comparison may not help (yet)

If you don’t control the account (energy included in rent/service charge).
If you’re in the middle of a supplier transfer dispute (resolve that first).
If your meter setup is unusual (e.g., complex multi-rate) — you may need a specialist quote.
If you have debt linked to a prepayment meter (you can still compare, but options may be narrower and rules apply).

Still unsure? Start a quote and tell us your meter type. We’ll help you compare the right set of tariffs rather than forcing a one-size-fits-all result.

Two realistic scenarios (with numbers)

These examples show how standing charges and unit rates combine. They are illustrative only and not an offer. Your rates depend on region, supplier, meter and payment method.

Scenario A: Dual fuel, Direct Debit, typical usage

Assumptions: Electricity 2,700 kWh/year, Gas 11,500 kWh/year. Tariff 1 vs Tariff 2 below.

Tariff 1: Elec 25.0p/kWh + 55p/day; Gas 6.5p/kWh + 35p/day
Tariff 2: Elec 24.0p/kWh + 62p/day; Gas 6.2p/kWh + 42p/day

Estimated annual cost

Tariff 1: Elec £877.50 + standing £200.75 ˜ £1,078; Gas £747.50 + standing £127.75 ˜ £875 ? ~£1,953/year
Tariff 2: Elec £648.00 + standing £226.30 ˜ £874; Gas £713.00 + standing £153.30 ˜ £866 ? ~£1,740/year

Note: We multiplied daily standing charges by 365 and used kWh × unit rate. Rounding can cause small differences.

Scenario B: Low usage flat, electricity only

Assumptions: Electricity 1,600 kWh/year (small flat). Comparing two electricity-only tariffs.

Tariff A: 23.5p/kWh + 65p/day
Tariff B: 26.0p/kWh + 45p/day

Estimated annual cost

Tariff A: Usage £376 + standing £237.25 ? ~£613/year
Tariff B: Usage £416 + standing £164.25 ? ~£580/year

Why this matters: For low usage, a higher unit rate can still be cheaper overall if the standing charge is significantly lower.

Costs, exclusions and common pitfalls (so you don’t get caught out)

Energy comparisons are only as good as the inputs. These are the most common UK issues we see — and how to avoid them.

1) Comparing by monthly Direct Debit

Monthly payments can include catch-up for past underpayment or be set high to build credit. Use kWh usage from your bill for a fair comparison.

2) Not matching your meter type

Economy 7 and prepayment tariffs are priced differently. If your meter type is wrong, your estimated savings can be misleading.

3) Ignoring standing charges

Standing charges are a daily cost. For smaller homes, they can make up a big portion of your total annual bill.

4) Exit fees and timing

Fixed deals can have exit fees. If you’re near the end of your fixed term, you may be able to switch without fees (supplier terms apply).

5) Discount conditions

Some tariffs assume paperless billing, Direct Debit, or smart meter readings. If you can’t meet the conditions, your price may differ.

6) Debt on the meter

If you have energy debt, switching can be more complex (especially prepayment). You can still compare, but options may be limited.

Important: If you’re struggling to pay, you may be eligible for support (e.g., payment plans or supplier help schemes). Citizens Advice can help you understand your options before switching.

Energy comparison FAQs (UK)

Do I need my usage in kWh to compare?

It’s best, because tariffs are priced per kWh plus a standing charge. If you don’t have kWh figures, you can start with an estimate, then refine it using your bill once you have it.

Will my energy go off when I switch?

No. You won’t be cut off just for switching supplier. The physical supply stays the same; only the billing and tariff change.

Can I switch if I’m renting?

Usually yes, if you’re responsible for paying the energy bills and your name is on the account. If energy is included in your rent or managed by the landlord, you generally can’t switch.

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

The unit rate is what you pay per kWh you use. The standing charge is a daily fixed cost. Your annual bill is essentially (kWh × unit rate) + (standing charge × 365).

Can I compare prepayment (PAYG) tariffs?

Yes, but availability can be narrower and depends on your meter. If you have debt on your prepay meter, switching may be restricted or require a specific process.

Do smart meters affect my tariff options?

Sometimes. Certain tariffs require smart meter readings or a compatible meter. If you don’t have a smart meter, you may still switch — but not every tariff will be suitable.

Are exit fees always charged on fixed tariffs?

Not always. Many fixed tariffs include exit fees, but the amount and rules vary. Your tariff terms will state whether a fee applies and in what circumstances.

How long does switching take in the UK?

Timescales vary by supplier and circumstances. In general, supplier-to-supplier switches can take days to a few weeks. Any delays are usually administrative (e.g., meter details, address matching).

If you’re unsure what meter you have: check your bill for “single-rate”, “two-rate/Economy 7”, or “prepayment”, or look at your meter display (some show Rate 1/Rate 2).

Trust, methodology and sources

Page ownership

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

How we assess comparisons (and limitations)

Our goal is to help you compare tariffs on a like-for-like basis and avoid common mistakes.

Inputs we prioritise: postcode region, meter type (single-rate, multi-rate/Economy 7, smart, prepayment), payment method, and annual usage (kWh).
Costing approach: estimated annual cost = (electricity kWh × electricity unit rate) + (electricity standing charge × 365) + (gas kWh × gas unit rate) + (gas standing charge × 365). Where available, we also consider tariff term, exit fees, and eligibility conditions.
Why results can differ from your current direct debit: direct debits can include repayment of past underpayment or be set to build credit; usage-based comparisons are more reliable.
Limitations: tariff availability changes; not all niche meter configurations can be priced instantly; supplier policies (credit checks, meter exchanges, debt rules) may affect eligibility; quotes are estimates until confirmed by the supplier.

Key UK sources we reference

Ofgem (UK energy regulator) — consumer rules, switching and market guidance
Citizens Advice: energy supply guidance — switching, billing and support if you’re struggling
GOV.UK — government guidance and support schemes (where applicable)

We aim to keep this guide accurate and up to date, but always check your supplier’s tariff information and your contract terms for the final word.

Ready to compare energy prices for your home?

Get a quote based on your postcode and details — and we’ll help you avoid the common comparison pitfalls.

Start my comparison Revisit key takeaways

No guaranteed savings. Quotes are estimates and subject to supplier terms, eligibility and confirmation of meter details.

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Updated on 20 Mar 2026