What is an energy tariff comparison?

An energy tariff comparison is a way to compare electricity and/or gas tariffs by looking at key costs and features—typically the unit rate (price per kWh), standing charge (daily fee), tariff type (fixed or variable), contract length, and exit fees. Comparing tariffs helps you understand what you’re likely to pay and which tariff best fits your usage.

How do I compare energy tariffs accurately?

To compare energy tariffs accurately, check: (1) unit rates for electricity and gas, (2) standing charges, (3) your estimated annual usage in kWh, (4) tariff length and whether prices are fixed or variable, (5) any exit fees or other charges. The most accurate comparison uses your real usage from recent bills or your online account rather than an estimate.

What’s the difference between a fixed and a variable energy tariff?

A fixed tariff typically locks in your unit rates and standing charges for an agreed term (for example 12 months), helping you budget. A variable tariff can change over time, often in line with wholesale costs and other factors, so your prices may go up or down. Always check the tariff terms and whether any price protection applies.

What are unit rates and standing charges?

The unit rate is the price you pay for each kilowatt-hour (kWh) of energy you use. The standing charge is a daily fixed cost that covers things like maintaining the energy network and running your account. When comparing tariffs, both matter—especially for low-usage homes where the standing charge can make up a larger share of the bill.

Will switching tariffs affect my energy supply?

No. Switching tariff or supplier does not change the energy delivered to your home and there’s no interruption to supply. Your electricity and gas still come through the same pipes and wires; only the company billing you and the tariff rates change.

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

Switching supplier is typically completed within a few working days, though timings can vary depending on the switch process and any specific circumstances. You’ll be kept informed of key dates, and your supply won’t be interrupted during the switch.

Can I switch if I’m in a fixed-term contract or have an exit fee?

You can usually switch while in a fixed-term contract, but you may need to pay an exit fee if you leave before the end date. Check your current tariff terms or bill for the exit fee amount and whether it applies. If you’re close to the end of the term, it may be worth timing the switch to avoid charges.

What information do I need to compare and switch energy tariffs?

You’ll typically need your postcode and address, the name of your current supplier, whether you want to compare electricity, gas or both, and your usage (kWh) or annual cost from a recent bill. If you decide to switch, you may also need your bank details for Direct Debit and a meter reading for a smooth handover.

How can I estimate my energy usage for a tariff comparison?

The best method is to use the kWh usage shown on your latest bill(s) or annual statement. If you don’t have that, you can estimate based on your home size, number of occupants, heating type, and typical usage patterns. Using real kWh figures makes comparisons more reliable.

Is it worth comparing electricity-only, gas-only, or dual fuel tariffs?

It depends on your home and how you use energy. Dual fuel can be convenient because both fuels are managed in one place, but it’s still important to compare the combined cost (unit rates + standing charges) against separate electricity-only and gas-only options to see what works best for your household.

How do I know which tariff is best for my household?

The ‘best’ tariff is the one that offers the lowest likely cost for your usage while matching your preferences—such as price certainty (fixed), flexibility (variable), or a specific contract length. Compare based on your actual kWh usage, check standing charges, and review any fees or terms before you decide.

Where can I get help with choosing or switching an Energy Plus tariff?

You can find guidance on Energy Plus Guides & FAQs and explore tariff information on the Energy Plus website. Start here: https://www.energyplus.co.uk/guidesfaqs/energy-tariff-comparison and browse more articles at https://www.energyplus.co.uk/guidesfaqs/.

Energy tariff comparison: compare UK deals properly

Understand unit rates, standing charges and tariff types (fixed, variable and smart) so you can compare like-for-like and switch with confidence.

See what actually changes your bill (rates, standing charge, usage and region)
Check exit fees, payment method differences and meter eligibility before you switch
Get a whole-of-market style quote journey with clear next steps

Get your energy quote How tariff comparison works

Estimates only. Prices, eligibility and exit fees vary by supplier, region, meter type and payment method.

Fast answer: how to compare energy tariffs in the UK

To compare energy tariffs properly, you need to look at your estimated annual cost (or monthly direct debit) using your usage and your region — not just the headline unit rate. Your bill is driven by:

Unit rate (p/kWh)

What you pay for each unit of gas/electricity used. Even small differences add up if your usage is high.

Standing charge (p/day)

A daily fixed cost. Higher standing charges can outweigh a cheap unit rate, especially for low users.

Tariff terms & eligibility

Fix length, exit fees, payment method, and whether you need a smart meter or specific meter type.

Key takeaway: The “best” tariff is the one with the lowest estimated total cost for your usage, in your region, with terms you’re happy with (like exit fees and contract length).

Compare tariffs with EnergyPlus

Use the form to start a comparison. We’ll use your details to estimate costs and match you with tariffs available for your postcode, meter type and payment preferences.

What you’ll need

Postcode (to get regional rates)
Whether you have gas, electricity or both
How you pay now (e.g. direct debit, prepayment)
Approx usage (or your last bill)

What we won’t do

No unrealistic “guaranteed savings” claims
No assumption that all tariffs fit all meters
No hidden “one supplier only” shortlist

Tip: If you can, have a recent statement handy. The most accurate comparisons use your annual kWh (gas and electricity) rather than a rough monthly spend.

Start your comparison

How tariff comparison works (step-by-step)

Collect your key info: postcode, payment method, meter type (credit, prepayment, smart), and either annual kWh or a recent bill.
Compare estimated total cost: we calculate an estimate using unit rates + standing charge for your region and the usage you provide.
Check the tariff terms: contract length, exit fees, any discounts, and whether prices can change (variable vs fixed).
Confirm compatibility: some tariffs require a smart meter, support only certain payment types, or apply different rates for single-rate vs Economy 7 meters.
Switch: switching is normally handled by your new supplier; you won’t need an engineer visit in most cases. Keep submitting meter readings until the switch completes.

Important: If you’re in debt on a prepayment meter, or you’re in the middle of moving home, switching can be more complex. See the FAQs below for UK-specific guidance.

Tariff comparison table (what to look for)

Use this table to decide which tariff type fits your situation. Exact prices and availability vary by supplier, region and meter.

Tariff type	How prices work	Best for	Watch-outs	What to check before switching
Fixed	Unit rate and standing charge are fixed for the contract term.	People who value bill stability and want to avoid in-contract price changes.	Exit fees may apply; you can miss out if prices fall.	Exit fee amount, end date, what happens at renewal, any limits on payment method.
Variable	Prices can change (usually with notice). Often no fixed end date.	People who may switch again soon and want flexibility.	Rates may rise; “intro” offers may end.	How/when prices can change, notice period, whether it’s a standard variable tariff (SVT).
Time-of-use (e.g. smart)	Different unit rates at different times (peak/off-peak).	Households that can shift usage (EV charging, storage heating, running appliances overnight).	Can cost more if you use most power at peak times; tariff structures vary widely.	Smart meter requirement, peak windows, how often rates change, export options if you have solar.
Economy 7 / multi-rate	Separate day and night electricity rates (set hours vary by region/meter).	Homes with storage heating or significant overnight use.	Day rate can be higher; can be poor value for typical daytime-heavy use.	Your off-peak times, how much usage you can shift, whether you can switch to single-rate.
Prepayment	Pay-as-you-go via key/card or smart PAYG.	People who prefer budget control or need prepay due to tenancy/credit constraints.	Limited deals; debt and emergency credit rules differ by supplier.	Debt status, top-up method, friendly credit hours, and whether you can move to credit meter.

Decision checklist (quick)

Choose a fixed tariff if…: You want predictable rates and you’re comfortable with a contract term and potential exit fee.
Choose a variable tariff if…: You want flexibility and may switch again soon, and you can tolerate price changes.
Consider time-of-use if…: You can move a meaningful share of usage to cheaper periods (e.g. EV charging overnight).

Who it suits / who it doesn’t

This page will help if you:

Pay by direct debit, receipt of bill, or prepayment
Have a credit meter, smart meter, Economy 7, or PAYG
Want to understand why quotes differ by region and usage

It may not fit if you:

Need business energy (different market and contracts)
Are on heat networks or communal billing (not standard domestic tariffs)
Have complex metering (e.g. some landlord sub-meters)

Two realistic scenarios (with numbers)

These examples show why you must compare the estimated annual cost, not just the unit rate. Figures are illustrative and rounded.

Scenario A: low electricity user (standing charge matters)

Assumptions: Electricity only, 1,800 kWh/year. Ignore discounts and VAT already included in rates. Compare two electricity tariffs in the same region.

Tariff	Unit rate	Standing charge	Estimated annual cost
Tariff 1	27p/kWh	65p/day	(1,800×£0.27) + (365×£0.65) ˜ £723
Tariff 2	29p/kWh	45p/day	(1,800×£0.29) + (365×£0.45) ˜ £687

Even with a higher unit rate, Tariff 2 is cheaper here because the standing charge is lower.

Scenario B: higher gas user (unit rate dominates)

Assumptions: Gas only, 12,000 kWh/year. Compare two gas tariffs in the same region.

Tariff	Unit rate	Standing charge	Estimated annual cost
Tariff A	7.2p/kWh	32p/day	(12,000×£0.072) + (365×£0.32) ˜ £981
Tariff B	6.6p/kWh	40p/day	(12,000×£0.066) + (365×£0.40) ˜ £938

Here, the cheaper unit rate wins even with a higher standing charge because gas usage is high.

Reminder: Real quotes can differ due to your region, payment method, meter type (single vs multi-rate), and supplier-specific charges/discounts. Always check the tariff information label before you switch.

Costs, exclusions and common pitfalls

These are the issues that most often make a “good-looking” tariff not as good in practice. Scan this list before committing.

1) Exit fees and contract end dates

Fixed tariffs often include exit fees. Check the fee per fuel and whether you’re within any penalty-free window near the end of your deal.

2) Payment method assumptions

Rates can differ for direct debit vs receipt of bill vs prepayment. Compare using the method you’ll actually use.

3) Meter type mismatch

Economy 7 and smart time-of-use tariffs aren’t interchangeable. If your meter is multi-rate, ensure the tariff supports it (or confirm a meter change first).

4) “Cheapest unit rate” trap

A low unit rate can be offset by a high standing charge (common for low users and small flats). Always check the estimated annual cost.

5) Variable rate change risk

Variable tariffs can change with notice. If you’re budgeting tightly, factor in the risk of price increases.

6) Switching while moving home

If you’re about to move, it can be better to take meter readings and set up the new property first, then compare once your account is live.

Accessibility note: If you use medical equipment at home or have additional needs, consider joining your supplier’s Priority Services Register (PSR). It doesn’t directly change your tariff price, but it can improve support during outages and provide extra services.

Energy tariff comparison FAQs (UK)

1) Why do energy prices vary by postcode?

Because network costs vary by region (electricity distribution and gas network areas). Suppliers factor these into standing charges and unit rates, so the same tariff can price differently across the UK.

2) Should I compare using monthly spend or kWh usage?

kWh is best. Monthly spend can be distorted by direct debit changes, credit balances and seasonal usage. If you only know spend, treat results as less precise and confirm with your last bill’s annual consumption when you can.

3) What’s the difference between a fixed tariff and the price cap?

A fixed tariff locks your rates for a term. The Ofgem price cap limits the maximum unit rate and standing charge level for many standard variable tariffs (SVTs) in Great Britain, but your bill still depends on usage and the cap level can change over time.

4) Can I switch if I rent (tenant) or live in a flat?

Usually yes, as long as you pay the energy bills and have a standard domestic meter. If bills are included in rent, or the building uses a communal/heat network, you may not be able to choose a supplier in the normal way.

5) Can I switch if I’m on a prepayment meter?

Often, yes — but choice can be more limited and your eligibility may depend on your debt status and meter type (key/card vs smart PAYG). If you have debt, switching may require it to be repaid or transferred under certain conditions.

6) Do I need a smart meter to get the best deal?

Not necessarily. Many fixed and variable tariffs don’t require one. However, smart/time-of-use tariffs (with different prices by time) typically do require a smart meter for accurate billing.

7) Will my supply be interrupted if I switch?

In most domestic switches, there’s no interruption. The physical gas/electricity infrastructure stays the same; the billing supplier changes. Keep an eye on communications and submit meter readings if requested.

8) What is an exit fee and when do I pay it?

An exit fee is a charge for leaving a fixed tariff before the end date. It’s typically added to your final bill. Not all tariffs have exit fees, and rules can vary depending on timing and supplier terms.

9) Should I choose dual fuel (gas + electricity with the same supplier)?

It can be convenient (one account and set of bills), but it’s not always cheapest. Compare total costs for both fuels together, and separately if you’re considering splitting across suppliers.

10) I’m in Northern Ireland — can I use this guidance?

The principles of comparing unit rates and standing charges still apply, but regulation and market arrangements differ from Great Britain. Check that the comparison journey you use supports your location and meter setup.

Trust, transparency and our methodology

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

How we assess tariff comparisons

This guide is designed to help UK households compare tariffs fairly. We focus on the inputs that most affect your estimated cost and whether you can actually take a tariff.

Regional pricing: we highlight postcode/region because distribution and network charges vary across Great Britain.
Meter and payment eligibility: we emphasise credit vs prepayment, smart vs non-smart, and single vs multi-rate metering.
Like-for-like costs: we encourage comparing estimated annual cost based on kWh + standing charge, not headline rates alone.
Terms and risk: we cover exit fees, contract length, and variable-rate change risk as part of the decision.

Limitations: Any comparison is an estimate until your supplier bills actual meter readings. Quotes can change if your usage estimate is off, your meter setup differs from assumptions, or a tariff closes/updates before you apply.

Sources we use (UK)

We also refer to supplier tariff information labels and publicly available price information where applicable.

Editorial standards (what we avoid)

We don’t promise guaranteed savings.
We don’t recommend tariffs without stating key caveats (eligibility, exit fees, variable pricing risk).
We prefer clear explanations and worked examples over jargon.

Ready to compare energy tariffs?

Get an estimate based on your postcode and preferences, then review the tariff terms before you decide. Switching is usually straightforward, but we’ll help you spot the gotchas.

Get your energy quote Recheck the comparison table

Note: the secondary button takes you back to the table so you can confirm tariff fit (fixed/variable/smart) before starting.

Back to Guides & FAQs

Updated on 30 Mar 2026