Octopus Energy vs British Gas: which is cheaper?

A UK-focused comparison guide that explains what really drives the price difference (tariff type, payment method, meter, region and usage). Get an estimate for your postcode and see like-for-like options across the whole market.

  • Fast answer first, then practical steps and examples
  • Two realistic household scenarios (with assumptions)
  • Transparent methodology and trusted UK sources
Get your energy quote How we assess “cheaper”

Prices vary by region, meter type and payment method. We don’t publish “live” supplier rates here—use the quote to see current deals for your postcode.

Fast answer: Octopus Energy vs British Gas which is cheaper

Octopus Energy vs British Gas which is cheaper depends on your postcode, meter type and how you pay—there isn’t one supplier that’s always cheaper. The most important factor is the tariff’s unit rate and standing charge for your region. Compare like-for-like using the same usage and payment method to see which is currently lower for you.

Key takeaway 1

“Cheaper” can flip depending on Direct Debit vs pay on receipt, and whether you have a smart meter (some tariffs require one).

Key takeaway 2

A tariff with a lower unit rate isn’t always cheapest if its standing charge is higher for your region (and vice versa).

Key takeaway 3

If you’re on a standard variable tariff, checking the market still matters: fixed deals and other options can appear and disappear quickly.

Important: We don’t publish “live” Octopus or British Gas rates on this page (they change frequently and vary by region). Use the quote tool to see current prices and full terms for your postcode.

Compare Octopus and British Gas for your home (postcode-level)

To answer “which is cheaper?” in a way that’s actually useful, you need a like-for-like comparison using your region (set by postcode), fuel type (gas, electricity or both), meter setup and payment method.

What you’ll get

  • Whole-of-market options (not just one supplier)
  • Estimated annual cost based on your details
  • Clear tariff features (e.g., fixed vs variable, smart-meter requirements)

If you’d rather skip the form here, you can also use the quote page directly.

Get your estimate

Share a few details and we’ll use them to show available options and estimated costs. You can switch or request help afterwards.

Used to match your regional rates and standing charges. We’ll never assume a tariff is available until we check.

By submitting, you’re asking us to contact you about energy options. You can opt out any time.

Like-for-like tip: When you compare Octopus Energy and British Gas, keep the same fuel (dual fuel vs single), payment method and contract length—otherwise “cheaper” can be misleading.

Octopus vs British Gas: what to compare (not just headline price)

Two tariffs can look similar but cost different amounts over a year. Use the table below as a checklist for a fair comparison. (You’ll see these fields in your quote results.)

What affects cost Why it matters What to check
Unit rate (electricity & gas) Most of your bill is driven by how much you use. Compare using the same annual kWh (or your actual bill usage).
Standing charge A daily cost that can make low-usage homes pay more. Check your region’s standing charge for each fuel.
Tariff type (fixed vs variable) Fixed prices can protect against increases; variable can move up or down. Look for the end date, price-change rules and any conditions.
Payment method Some tariffs price differently for Direct Debit vs other methods. Match the payment method you’ll actually use.
Meter setup (standard, smart, prepayment) Eligibility and pricing can differ for smart and prepay meters. Confirm your meter type and whether a tariff requires a smart meter.
Exit fees / switching terms Leaving a fixed deal early may cost money (or it may not). Check the tariff facts and your current contract end date.

Quick decision checklist

This comparison will be most accurate if you have:
A recent bill (or your annual kWh), your postcode, and your payment method.
Prioritise unit rate if you:
Use above-average energy (larger homes, electric heating, many occupants).
Prioritise standing charge if you:
Use less energy (small flats, lots of time away, second homes).

Who it may suit (and who it may not)

  • Octopus Energy may suit people who want app-based account management and are happy to compare tariff features regularly.
  • British Gas may suit people who prefer a large, established supplier and want to compare the total package (energy + any optional services) before switching.
  • Either may not suit you if you’re in debt on your energy account or you need a specialist arrangement—get advice first (see sources below).

Supplier experiences and service levels can vary by region and over time. Price should be compared alongside customer support preferences and tariff terms.

Two realistic scenarios (with numbers you can sanity-check)

Because we can’t publish live Octopus or British Gas prices here, these examples show how the maths works using typical bill components: unit rate × usage plus standing charge × days. Replace the example rates with the live figures you see in your quote results.

Scenario A: Low usage flat (standing charge matters)

Assumptions: Electricity-only flat, 1 occupant, low annual usage. You compare two tariffs with similar electricity unit rates, but different standing charges.

Example inputs (illustrative):

  • Annual electricity usage: 1,800 kWh
  • Tariff 1 unit rate: 25p/kWh (example)
  • Tariff 2 unit rate: 25p/kWh (example)
  • Tariff 1 standing charge: 45p/day (example)
  • Tariff 2 standing charge: 60p/day (example)

Illustrative outcome: the higher standing charge adds about £55/year (15p × 365) even when the unit rate is the same.

Note: figures are examples only. Your region’s standing charge can be materially higher or lower.

Scenario B: Family home (unit rate matters)

Assumptions: Dual fuel home, above-average usage. You compare two tariffs where one has a lower unit rate but a slightly higher standing charge.

Example inputs (illustrative):

  • Annual electricity usage: 4,200 kWh
  • Annual gas usage: 12,000 kWh
  • Tariff A electricity: 27p/kWh; Tariff B electricity: 26p/kWh (example)
  • Tariff A gas: 7.0p/kWh; Tariff B gas: 6.8p/kWh (example)
  • Tariff B standing charges are 10p/day higher across fuels (example)

Illustrative outcome: a 1p/kWh drop on 4,200 kWh saves about £42/year on electricity; a 0.2p/kWh drop on 12,000 kWh saves about £24/year on gas. Total ~£66/year, which can outweigh a ~£36.50/year increase from 10p/day extra standing charges.

Note: examples exclude optional add-ons and assume rates stay constant for the period.

Best practice: Use your last 12 months of kWh from bills (not just £ spend) to avoid seasonal distortion and to make Octopus vs British Gas (or any supplier) comparisons fair.

Costs, exclusions and common pitfalls (UK-specific)

When people ask whether Octopus Energy or British Gas is cheaper, the answer often changes once you include the details below. Use these checks to avoid surprises.

1) Not comparing the same payment method

Direct Debit, pay on receipt, and prepayment pricing can differ. Make sure your quote uses the method you’ll actually pay with.

2) Standing charges hiding the true cost

If your usage is low, a higher daily standing charge can outweigh a slightly lower unit rate.

3) Smart meter requirements

Some tariffs are only available with a compatible smart meter. If you don’t have one, check eligibility before deciding “cheaper”.

4) Contract terms and exit fees

Fixed deals may have exit fees; variable tariffs usually don’t. Always check your current contract end date and the new tariff’s leaving terms.

5) New-customer vs existing-customer offers

Availability can differ depending on whether you’re switching in, renewing, or changing tariffs with your current supplier. A quote gives the most accurate view.

6) Regional variation (postcode matters)

Standing charges and unit rates vary across Great Britain due to distribution costs. A tariff that’s cheaper in one area may not be elsewhere.

If you’re in debt or on a prepayment meter: switching may still be possible, but there can be restrictions and extra steps. Citizens Advice has guidance on switching if you owe money or have a prepay meter.

FAQs

Is Octopus Energy cheaper than British Gas?

Sometimes, but not always. The cheaper option depends on your postcode (regional charges), meter type (smart/prepay/standard), payment method and how much energy you use. A like-for-like quote using your usage is the quickest way to see which is currently cheaper for you.

Why do prices differ by postcode in the UK?

Energy bills include regional distribution charges. Because those charges vary across Great Britain, suppliers’ standing charges and unit rates can vary by region too. That’s why a comparison needs your postcode to be accurate.

Do I need a smart meter to get the cheapest tariff?

Not necessarily. Some tariffs may require a compatible smart meter, while others don’t. If you don’t have a smart meter, you can still compare and switch—just filter for tariffs you’re eligible for and check any meter requirements in the tariff terms.

How do I compare tariffs fairly between Octopus and British Gas?

Use the same annual kWh (from your bills if possible), the same payment method, and the same fuel setup (electricity-only vs dual fuel). Then compare estimated annual cost, unit rates, standing charges, contract length and any exit fees. Avoid comparing a fixed tariff to a variable tariff unless you understand the trade-offs.

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

Often yes, but options can be more limited and there may be checks, especially if you have debt. The safest approach is to compare using your correct meter type and read the eligibility notes carefully. If you’re unsure, Citizens Advice can help you understand your rights and options.

Will switching supplier affect my energy supply?

No—your gas and electricity still come through the same pipes and wires. Switching changes who bills you and the tariff you’re on. You should not be cut off because you switched, and your supply should continue as normal during the switch process.

Are there any fees for switching from British Gas to Octopus (or vice versa)?

Switching itself is usually free, but your current tariff may have exit fees if you’re leaving a fixed deal early. Always check your latest statement or online account for your current tariff’s end date and any leaving charges before you start.

What information do I need to get an accurate quote?

Your postcode, whether you want gas, electricity or both, your payment method, and (ideally) your annual usage in kWh from a recent bill. If you don’t have kWh to hand, an estimate can still work, but your results will be less precise.

How we assess “which is cheaper” (methodology you can verify)

Our like-for-like approach

  • Same region: we use your postcode to reflect regional charges.
  • Same usage basis: we calculate estimated costs using annual kWh (from you or an estimate).
  • Same payment method: Direct Debit vs other methods aren’t mixed.
  • Same fuel setup: electricity-only and dual fuel are treated separately.
  • Same term assumptions: we consider tariff length and key terms (where provided) so users can judge trade-offs.

Limitations and caveats

  • No live tariff publication: we don’t list Octopus or British Gas unit rates/standing charges on this page because they change frequently and vary by region.
  • Eligibility can vary: some tariffs require certain meter types or conditions.
  • Estimated costs: results depend on your usage accuracy and assume prices remain as stated for the tariff period.
  • Extras not assumed: optional add-ons and non-energy services aren’t automatically included unless clearly presented in the tariff information.

Trust signals

Sources (UK)

We prioritise regulators and consumer bodies for guidance on switching rules and bill components.

See whether Octopus or British Gas is cheaper for you

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Updated on 4 Jul 2026