Cheapest green electricity tariff to switch to in the UK (right now)
Find an estimated low-cost green electricity tariff for your home based on your postcode, meter type and payment method — and switch with confidence.
- Whole-of-market comparison (where available) — prices can vary by region and meter
- Clear checks for 100% renewable electricity and tariff terms (e.g. exit fees)
- Fast quotes for credit, prepayment and smart meters
Prices shown on this page are illustrative examples. Your cheapest green tariff depends on your region, consumption, meter and payment method. Terms and availability change frequently.
Fast answer: how to find the cheapest green electricity tariff in the UK
There isn’t one single “cheapest green tariff” for everyone in the UK. The cheapest option depends on your region (distribution area), meter type (standard, smart, Economy 7, prepayment), payment method (Direct Debit vs pay on receipt) and how much electricity you use. The quickest way to find yours is to compare prices using your postcode and usage, then check the tariff’s green credentials and terms.
What “cheap” usually means
The lowest estimated annual cost for your usage, not just the lowest unit rate. Standing charges can make a big difference.
What “green electricity” usually means
A tariff backed by Renewable Energy Guarantees of Origin (REGOs) or equivalent evidence of renewable sourcing. “Green” claims can differ.
When switching is simplest
If you’re on a variable tariff with no exit fee. Fixed deals may have fees—always check your current contract first.
Key takeaway: A cheap green tariff is the one with the lowest estimated total cost for your home and the green credentials and terms you’re happy with. Use your postcode, meter type and payment method to avoid misleading headline prices.
Compare green electricity tariffs for your postcode
We’ll show estimated prices from participating suppliers and highlight key terms (standing charge, unit rate, contract length, and any exit fees where provided). If you also use gas, you can compare dual fuel too.
Tip: Have a recent bill handy if you can (annual kWh usage). If not, we can still estimate using typical consumption — but your “cheapest” result may change once exact usage is known.
What you’ll need
- Postcode (to price your region correctly)
- Meter type (smart, standard, Economy 7, prepayment)
- Payment method preference (Direct Debit is often lowest)
- Optional: annual usage (kWh) from your bill for best accuracy
What happens next
- We match tariffs to your postcode and meter type.
- You can filter to “green electricity” and compare total estimated cost.
- If you choose to switch, your new supplier handles the transfer — no engineer visit for most switches.
Get your green tariff quotes
Enter your details to start a comparison. We use your information to provide quotes and to contact you about your results.
How to choose the cheapest green electricity tariff (without falling for headline prices)
To find a genuinely low-cost green tariff, you need to compare the total estimated annual cost for your household — then confirm the green claim and the contract terms. Use the steps below to keep it simple and avoid common switching regrets.
Step 1: Price it properly for your home
- Use postcode pricing (standing charges vary by region)
- Choose your meter type (Economy 7 and prepayment can price differently)
- Compare payment methods (Direct Debit is often lower, but not always best for everyone)
- Check whether the estimate uses your real kWh or a typical assumption
Step 2: Confirm it’s a green electricity tariff
- Look for 100% renewable electricity wording in the tariff details
- Check how the supplier supports this (often via REGOs)
- Read the supplier’s Fuel Mix / Fuel Mix Disclosure (usually in their documents)
- Be cautious with broad “eco” claims that don’t specify electricity sourcing
Step 3: Scan tariff terms that affect “cheap”
- Exit fees
- Fixed tariffs may charge a fee if you leave early. Variable tariffs usually don’t, but check.
- Contract length
- A longer fix can help budgeting, but might not be best if your needs change (e.g. moving house).
- Standing charge vs unit rate
- Low unit rates can look great, but a high standing charge may cost more overall—especially for low usage homes.
Step 4: Make sure you’re eligible
- Prepayment: fewer tariffs are available; check if the supplier supports your top-up type
- Economy 7: confirm day/night rates and your usage split (common pitfall)
- Smart tariffs: may require a working smart meter with half-hourly readings
- Tenants: you can usually switch if you pay the bills—check your tenancy agreement for any restrictions
Switching timeline (typical): many supplier switches complete within a few working days, but times can vary. Your current supply won’t be interrupted during a switch.
Quick comparison: what to check before choosing the “cheapest green” tariff
Use this table to compare like-for-like. The “best” cheap green tariff is the one that stays low after you account for standing charge, your usage, and tariff rules.
| Check | Why it matters for cheapest price | What to look for | Common gotcha |
|---|---|---|---|
| Estimated annual cost | Combines unit rate + standing charge based on your kWh | An estimate using your real usage where possible | Comparing tariffs using different usage assumptions |
| Standing charge | High standing charge can outweigh low unit rates | Lower standing charge if you’re a low user | A “cheap” unit rate with a much higher standing charge |
| Payment method | Some tariffs are priced differently by payment method | Direct Debit price vs pay-on-receipt price | Choosing a tariff you can’t (or don’t want to) pay by DD |
| Meter eligibility | Not all tariffs are available for Economy 7 or prepay | Explicit support for your meter type | Seeing a great tariff you can’t actually switch to |
| Green claim (electricity) | “Green” isn’t priced consistently; verify what you’re paying for | 100% renewable electricity stated + supporting docs (e.g. REGOs) | Assuming “green” means the same across suppliers |
| Exit fees & contract length | Fees can wipe out savings if you leave early | £0 exit fee if you want flexibility (where available) | Fixing then moving house or switching again soon |
Decision checklist: who a cheap green tariff suits
- You can provide accurate usage (or you’re happy with an estimate).
- You want 100% renewable electricity backed by supplier documentation.
- You’re comfortable with the payment method (often Direct Debit for the lowest pricing).
- You’ve checked contract length and any exit fees.
Who it may not suit (or needs extra care)
- You’re on prepayment and have limited tariff availability in your area.
- You have Economy 7 but most of your usage is daytime (a single-rate tariff could be cheaper).
- You’re in a fixed deal and might pay an exit fee that outweighs the benefit.
- You need a single supplier requirement from a landlord/heat network (rare, but possible).
Remember: your “cheapest” green electricity tariff today may not stay the cheapest at renewal. Set a reminder to compare again a few weeks before your deal ends (if fixed).
Costs, exclusions and common pitfalls (UK-specific)
Most switching problems aren’t about the switch itself — they come from tariff terms, meter mismatches, or comparing the wrong numbers. These are the most common issues we see for UK households looking for the cheapest green electricity deal.
Pitfall: exit fees
If you’re currently in a fixed tariff, an exit fee could reduce or remove any benefit. Always check your latest statement or account.
Pitfall: Economy 7 mismatch
Economy 7 can be great if a meaningful share of usage is overnight. If you’re mostly daytime, a single-rate tariff may work out cheaper.
Pitfall: comparing unit rates only
A lower unit rate can lose to a higher standing charge. Use total annual estimate for a fair comparison.
Scenario 1: Low usage flat (single-rate, Direct Debit)
Assumptions (illustrative): 1-bedroom flat, 1,800 kWh/year electricity, single-rate meter, paying by monthly Direct Debit, same region across both examples.
| Example tariff | Standing charge | Unit rate | Estimated annual cost |
|---|---|---|---|
| Tariff A (higher standing charge) | 70p/day | 24p/kWh | (0.70×365) + (0.24×1800) = £687.50 |
| Tariff B (lower standing charge) | 45p/day | 26p/kWh | (0.45×365) + (0.26×1800) = £632.25 |
Even though Tariff B has a higher unit rate, it’s cheaper overall for a low-usage home because the standing charge is lower. This is why we recommend comparing total estimated cost, not unit rate alone.
Scenario 2: Economy 7 household (day/night split matters)
Assumptions (illustrative): 3,600 kWh/year electricity on Economy 7. Compare two different night-use patterns.
| Example Economy 7 tariff | Standing charge | Day / Night rate | Estimated annual cost |
|---|---|---|---|
| Tariff C | 55p/day | 30p / 12p | If 35% night: (0.55×365)+((0.30×2340)+(0.12×1260)) = £1,055.75 |
| Tariff C (same tariff, different usage split) | 55p/day | 30p / 12p | If 15% night: (0.55×365)+((0.30×3060)+(0.12×540)) = £1,179.15 |
Same tariff, same total kWh — but a different night-usage pattern changes the estimate materially. If you’re unsure of your split, check your bill or smart meter app before switching.
Important: The scenarios above are for understanding the maths. Your actual rates depend on your region, supplier and tariff, and may change over time. Always use a current quote for your postcode to decide.
FAQs: cheapest green electricity tariff switching in the UK
Is the cheapest green electricity tariff always a fixed deal?
Not always. Fixed tariffs can be competitively priced and help you budget, but they may include exit fees. Variable tariffs can be flexible (often no exit fee) but prices may change. Compare the estimated annual cost and the terms for your situation.
What does “100% renewable electricity” mean in the UK?
In the UK, green electricity tariffs commonly use certificates such as REGOs to evidence that renewable electricity was generated and matched to supply. Approaches can differ between suppliers, so read the tariff details and supplier documents.
Can I switch to a green tariff if I’m renting?
Usually, yes — if you’re responsible for paying the energy bills and the meter isn’t part of a landlord-supplied arrangement. If bills are included in rent, you normally can’t choose the supplier.
Will my electricity be cut off when I switch suppliers?
No. Switching changes who bills you, not the physical electricity supply to your home. Your electricity should continue as normal during the switch.
Are green tariffs more expensive?
Not necessarily. Some green tariffs can be priced similarly to non-green tariffs, and the cheapest option varies by supplier, region and meter type. Always compare using your postcode and usage.
Do I need a smart meter for a cheap green tariff?
Only for some smart tariffs (for example, tariffs that require half-hourly readings). Many green fixed and variable tariffs work with standard meters too. If you have Economy 7, make sure you’re comparing the correct meter type.
Can I switch if I have a prepayment meter?
Often yes, but your choice of tariffs may be more limited and some deals may not be available. When you compare, filter by prepayment and check any requirements for top-up method or meter compatibility.
What if my current supplier says I’m in debt?
Debt can affect switching in some situations. If you’re struggling, seek independent support and check what options are available. Citizens Advice has practical guidance on energy issues, billing and switching.
Trust, methodology and sources
Editorial information
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- April 2026
How we assess “cheapest green electricity tariff”
We treat “cheapest” as the lowest estimated annual cost for a given household profile, using tariff components available at the time (standing charge, unit rates, and where applicable day/night rates). We then apply a green check based on the tariff’s stated renewable electricity position and supplier documentation where available.
- Inputs that change prices: postcode region, meter type, payment method, usage (kWh), and tariff availability
- Green criteria (practical): tariff states 100% renewable electricity and provides a basis for that claim (commonly via REGOs); we also encourage users to read the supplier’s fuel mix disclosure
- User-first ranking: we prioritise total estimated cost for your details, then highlight exit fees/contract length and key eligibility notes
Limitations: Tariffs can be added/withdrawn quickly and prices vary by region and meter. “Green” electricity claims can be structured differently by suppliers. Always confirm the latest tariff information before switching.
Sources (UK)
- Ofgem (Great Britain energy regulator) — regulation, switching and consumer guidance
- Citizens Advice: Energy — practical consumer help with bills, switching and complaints
- GOV.UK — official information on energy support schemes and consumer rights
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