Compare energy prices (UK): tariffs, suppliers and what to check
A practical UK guide to comparing gas and electricity prices—what affects your quote, how to read unit rates and standing charges, and how to switch with confidence.
- Understand unit rates vs standing charges (and why the “cheapest” isn’t always cheapest)
- Compare like-for-like by payment method, region and meter type (including smart & prepayment)
- See realistic scenarios with estimated costs and a switching checklist
Quotes are estimates and depend on your region, meter type, payment method and usage. Always check tariff terms and any exit fees before switching.
Fast answer: how to compare energy prices in the UK
To compare energy prices accurately, you need to compare the unit rate (pence per kWh) and the standing charge (pence per day) for your region, your meter type and your payment method. Then estimate the yearly cost using your usage in kWh (or your typical monthly spend if you don’t have kWh figures yet).
1) Get the right details
Postcode (region), meter type (credit / prepayment / smart), and payment method (direct debit / on receipt of bill).
2) Compare total estimated cost
A low unit rate can be offset by a higher standing charge (and vice versa). Always check both.
3) Check terms before switching
Exit fees, fixed term length, discounts, and any requirements (e.g., smart meter, online account).
Quick tip: If you don’t know your yearly usage, look for “kWh” on your bill or in your online account. Otherwise, use your last 3–12 months’ costs as a starting point and treat any quote as an estimate.
How comparing energy prices works (and what changes your quote)
Energy prices aren’t one-size-fits-all. Two households can see different tariffs even with the same supplier because the quote depends on the details below.
- Region (postcode): Standing charges and unit rates vary by distribution area.
- Fuel type: Electricity-only vs dual fuel (gas + electricity).
- Meter type: Credit meter, smart meter, prepayment, or Economy 7/10 (where applicable).
- Payment method: Direct debit tariffs can differ from paying on receipt of bill; prepayment is often priced differently.
- Your usage (kWh): A tariff with a lower standing charge can suit low usage; a lower unit rate can suit high usage.
The simple cost formula (so you can sanity-check quotes)
Estimated annual cost ˜ (Unit rate × yearly kWh) + (Standing charge × 365)
You’ll do this separately for electricity and gas, then add them together for a dual-fuel estimate.
Caveat: If you have Economy 7 (day/night rates) or a legacy tariff, you’ll need your split between day and night usage for the best comparison.
Get a like-for-like energy quote
Share a few details and we’ll help you compare available home energy deals. It takes around 2 minutes.
What you’ll need (if handy): your latest bill (kWh usage), current tariff name, and whether you’re on direct debit or another payment method.
Compare energy prices: what to check (table) + decision checklist
Use this to compare tariffs on a like-for-like basis. Focus on the rows that match your situation (e.g., prepayment or Economy 7).
| What you’re comparing | Why it matters | What to look for | Common gotcha |
|---|---|---|---|
| Unit rate (p/kWh) | Drives most of the bill for higher-usage homes | Electricity and gas shown separately; check if single-rate or day/night | Comparing a day/night tariff without knowing your split |
| Standing charge (p/day) | You pay it regardless of usage | Confirm it’s for your region and meter type | Low unit rate but high standing charge for low-usage homes |
| Payment method | Prices can differ by direct debit vs other methods | Match your actual preference and ability to pay | Choosing direct debit pricing when you plan to pay on receipt of bill |
| Tariff type | Affects price certainty and flexibility | Fixed (set rates for a term) vs variable (rates can change) | Assuming “fixed” means your bill is fixed—only the rates are |
| Exit fees & term length | You may pay to leave early | Exit fees per fuel; end date; any fee-free switching window | Not factoring a £/fuel exit fee into your “savings” |
| Meter compatibility | Some tariffs are restricted to certain meter setups | Prepayment availability; Economy 7; smart requirements | Being quoted a tariff you can’t take without a meter change |
Best suited to you if…
- You can confirm your meter type and payment method
- You have a recent bill (or a good estimate of usage)
- You’re happy to compare total cost, not just headline rates
- You’re willing to check terms like exit fees and tariff end date
You may need extra care if…
- You’re on Economy 7/10 and don’t know your day/night split
- You have a complex meter setup (e.g., multiple registers)
- You’re repaying energy debt via prepayment deductions
- You’re moving home soon (exit fees may matter more)
Reminder: The “best” tariff is the one with the lowest estimated total cost for your usage and the right terms for your situation—not necessarily the lowest unit rate.
Costs, exclusions and common pitfalls (UK)
These are the most common reasons people think they’ve found a cheaper deal—then the real bill doesn’t match expectations.
1) Comparing the wrong payment method
If you pick direct debit pricing but plan to pay on receipt of bill, the actual rates can differ. Always compare using the payment method you’ll actually use.
2) Not matching meter type
Prepayment and Economy 7 tariffs are priced differently. A quote for a standard credit meter may not apply to your setup without changes.
3) Exit fees on your current tariff
Some fixed deals charge a fee per fuel if you leave early. Factor that into whether switching now is worthwhile.
4) Economy 7 assumptions
If most of your usage happens in the daytime, an Economy 7 tariff can cost more. Your day/night split matters more than the headline rates.
5) Debt recovery on prepayment
If you repay debt through your meter, some top-ups are taken automatically. A “cheaper” tariff may not feel cheaper until the debt is cleared.
6) Discounts and conditions
Some deals rely on online-only management, paperless billing, or meeting certain criteria. Check the tariff information and terms.
Scenario A (electricity-only flat): why standing charge matters
Assumptions: Single-rate electricity; 1,800 kWh/year usage; prices are illustrative; VAT at the domestic rate may apply as per supplier billing.
| Example tariff | Unit rate | Standing charge | Estimated yearly cost |
|---|---|---|---|
| Tariff 1 (lower unit, higher standing) | 24p/kWh | 70p/day | (0.24×1,800)=£432 + (0.70×365)=£255.50 ? £687.50 |
| Tariff 2 (higher unit, lower standing) | 27p/kWh | 45p/day | (0.27×1,800)=£486 + (0.45×365)=£164.25 ? £650.25 |
Even though Tariff 1 has a lower unit rate, the higher standing charge makes it cost more for a lower-usage household.
Scenario B (dual fuel house): why unit rate matters at higher usage
Assumptions: Electricity 3,100 kWh/year; Gas 12,000 kWh/year; illustrative rates; exclude any exit fees and any one-off credits.
| Example tariff | Electric (unit / standing) | Gas (unit / standing) | Estimated yearly total |
|---|---|---|---|
| Tariff A (slightly higher standing) | 26p / 60p | 6.5p / 33p | Elec: (0.26×3,100)=£806 + (0.60×365)=£219 ? £1,025 Gas: (0.065×12,000)=£780 + (0.33×365)=£120 ? £900 Total ˜ £1,925 |
| Tariff B (lower standing, higher units) | 28p / 50p | 7.2p / 28p | Elec: (0.28×3,100)=£868 + (0.50×365)=£182.50 ? £1,050.50 Gas: (0.072×12,000)=£864 + (0.28×365)=£102.20 ? £966.20 Total ˜ £2,016.70 |
At higher usage, a small difference in unit rates can outweigh savings from a lower standing charge.
Important: These scenarios are worked examples to show the maths. Real quotes vary by region, supplier, tariff availability, meter type and payment method, and prices can change.
FAQs: comparing energy prices
What’s the difference between unit rate and standing charge?
The unit rate is what you pay for each kWh you use. The standing charge is a daily fixed amount to cover network and metering costs. Both affect the overall bill.
Why do prices change by postcode?
Electricity and gas distribution costs vary across Great Britain. Suppliers reflect these regional differences in standing charges and sometimes unit rates.
Can I switch if I’m renting?
Often yes—if you pay the energy bills and are the account holder. If bills are included in rent, or your landlord manages the account, you may not be able to change supplier.
Will switching interrupt my gas or electricity supply?
Switching supplier is usually administrative, so supply should not be interrupted. If there are issues (e.g., meter details don’t match), switching can be delayed.
What if I have a prepayment meter?
You can still compare and switch, but tariffs and availability can differ. If you have energy debt, you may have limited switching options until it’s repaid or agreed with the supplier.
Do I need a smart meter to get the best deals?
Not always. Some tariffs may be smart-meter-only, but many standard fixed and variable tariffs are available without one. Always check eligibility in the tariff terms.
How do I find my kWh usage?
Look on your bill or online account for annual consumption in kWh, or add up recent kWh statements. If you only have £ spend, you can still compare, but treat results as estimates.
Fixed vs variable: which is better?
Fixed tariffs can offer price certainty for the term (rates fixed, not your bill). Variable tariffs can change. The better choice depends on your risk preference, current market prices and any exit fees.
If you’re unsure of your meter type (standard vs Economy 7 vs prepayment), check your bill wording or your meter display, or contact your current supplier for confirmation before switching.
Trust, methodology and sources
Page details
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- April 2026
How we assess “compare energy prices” guidance
This guide is designed to help UK households compare tariffs on a like-for-like basis. We prioritise clarity and consumer outcomes over “headline” pricing.
- Comparison inputs we treat as essential: postcode/region, meter type, payment method, and usage (kWh where possible).
- Cost lens: we focus on total estimated annual cost, not just unit rate or standing charge in isolation.
- Terms lens: we highlight tariff type (fixed/variable), term length, exit fees, and eligibility constraints.
- Limitations: examples are illustrative; real tariffs vary by supplier availability, region, meter details, and market movements. Your bill can also change with usage and future price changes.
Transparency note: We do not promise savings. Switching outcomes depend on your current tariff, any fees, and future price changes. Always read the tariff information and supplier terms before you agree.
Helpful UK sources
- Ofgem (UK energy regulator) — guidance on consumer rights, price cap and switching.
- Citizens Advice: Energy — practical help on bills, switching, and complaints.
- GOV.UK: Energy — government information on grants, support schemes and energy advice.
Ready to compare energy prices for your home?
Get an estimate based on your postcode, meter type and preferences—then review tariff terms before you switch.
If you’re mid-move, on Economy 7, or have a prepayment meter with debt recovery, allow extra time and double-check eligibility before switching.
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