Cheapest green electricity switch in the UK this week
Compare whole-of-market estimated prices for renewable electricity tariffs and see which switches could be cheapest for your home, based on your postcode, meter and payment method.
- Works for homeowners and tenants (single-fuel electricity or dual-fuel)
- Accounts for region, meter type and payment method (where suppliers support it)
- Clear caveats on green claims (REGOs), unit rates and exit fees
Prices are estimated and change frequently. “Green” electricity usually means suppliers buy renewable certificates (REGOs). Your local electricity still comes through the national grid.
Fast answer: what “cheapest green electricity this week” really means
There isn’t one single cheapest green electricity tariff for everyone in the UK this week. The cheapest switch depends on your region (Distribution Network Operator area), meter type (standard, Economy 7, smart), payment method (monthly Direct Debit vs prepayment), and your estimated kWh usage. The only reliable way to find the cheapest green option for you is to run a postcode-based comparison across the market.
Quick reality check on “green”: most UK green electricity tariffs are backed by REGOs (Renewable Energy Guarantees of Origin). That’s a recognised certificate scheme, but it doesn’t mean electrons to your home come directly from a specific wind farm. Some tariffs go further (e.g., additional renewable investment or specific generator matching) and can cost more.
Key takeaways
- Monthly cost = unit rate × usage + daily standing charge (plus any add-ons).
- Some of the cheapest tariffs are fixed deals with exit fees—often worth it, but check timing.
- Smart meters can unlock more tariff types, but are not always required for fixed deals.
- If you’re on prepay or have meter restrictions, your “cheapest” options can be fewer.
What to do next (2 minutes)
- Find your postcode and whether you pay by Direct Debit or prepay.
- Check if you’re electricity-only or want to switch gas + electricity.
- If you can, grab your last bill to confirm approximate annual kWh.
- Run a comparison and review total estimated annual cost and exit fees.
Compare this week’s cheapest green electricity deals for your home
Tell us a few details and we’ll match you with available tariffs for your area and meter. We’ll show estimated annual cost, unit rates, standing charges, contract length and any exit fees, so you can decide with confidence.
Tip: If you don’t know your annual usage, you can still compare using typical estimates. For best accuracy, use your latest bill or smart meter app.
What counts as “green” in our results?
- Renewable electricity backed by REGOs is the baseline for “renewable” labelling.
- We highlight tariffs with additional green features where disclosed (e.g., extra renewable investment, time-matched generation, green gas options).
- You’ll still see the important price building blocks: unit rate (p/kWh) and standing charge (p/day).
Get your quote
Switching is usually straightforward: your new supplier arranges the changeover. You normally won’t have an interruption to supply.
Compare: what “cheapest” looks like for green electricity
Use the table below to weigh up price against flexibility. Exact rates vary by region, usage and payment method, but these are the decision factors that usually change which green tariff is cheapest overall.
| Option | Typically cheapest when… | Watch-outs | Best for |
|---|---|---|---|
| Fixed green tariff (12–24 months) |
A supplier prices aggressively to win customers in your region, and your usage fits their rates. | Exit fees may apply; check standing charge vs unit rate balance. | Bill stability and people planning to stay put. |
| Flexible / variable green tariff (no fixed end date) |
You want no exit fees and are ready to switch again if prices drop. | Rates can change; may not be the cheapest in a given week. | Renters, movers, or anyone prioritising flexibility. |
| Green EV / time-of-use (off-peak discounts) |
You can shift usage (e.g., EV charging, appliances) into off-peak windows. | Often needs a smart meter; peak rates can be high. | EV owners and high flexibility households. |
| Economy 7 green (day/night rates) |
You use a meaningful share at night (often 30–40%+), commonly with storage heaters. | If most use is daytime, it can cost more overall. | Homes with storage heating or consistent overnight usage. |
Cheapest green switch checklist
- Confirm tariff type: fixed vs variable; single-rate vs multi-rate.
- Compare estimated annual cost, not just unit rate.
- Check standing charge (can outweigh a cheaper unit rate for low users).
- Look for exit fees and how they apply (per fuel, per meter, or per contract).
- Verify payment method eligibility (Direct Debit tariffs can differ vs prepay).
- Read the “green” description: REGO-backed vs extra environmental claims.
Who this suits (and who it doesn’t)
- Suits you if…
- You can pay by monthly Direct Debit, you know (or can estimate) your kWh use, and you’re happy with REGO-backed renewable electricity.
- May not suit you if…
- You’re on prepay with limited supplier options, you’re in debt with a supplier (you may need to clear or arrange it first), or you want “additionality” (direct project support) only—these options can be pricier and fewer.
Two realistic “cheapest” scenarios (with numbers)
These examples show how the cheapest green tariff can change depending on standing charge, unit rate and usage. They’re illustrative only (not live market quotes).
Scenario A: Low-use flat (electricity-only)
- Payment: monthly Direct Debit
- Meter: single-rate
- Annual use: 1,800 kWh
| Illustrative tariff | Unit rate | Standing charge | Estimated annual cost |
|---|---|---|---|
| Tariff 1 (lower unit, higher standing) | 24.0p/kWh | 60p/day | (1,800×£0.24)+ (365×£0.60)= £651 |
| Tariff 2 (higher unit, lower standing) | 26.0p/kWh | 45p/day | (1,800×£0.26)+ (365×£0.45)= £632 |
Even with a higher unit rate, the lower standing charge can make Tariff 2 cheaper for low usage.
Scenario B: Family home (higher electricity use)
- Payment: monthly Direct Debit
- Meter: single-rate (smart meter optional)
- Annual use: 4,200 kWh
| Illustrative tariff | Unit rate | Standing charge | Estimated annual cost |
|---|---|---|---|
| Tariff 1 (lower unit, higher standing) | 24.0p/kWh | 60p/day | (4,200×£0.24)+ (365×£0.60)= £1,227 |
| Tariff 2 (higher unit, lower standing) | 26.0p/kWh | 45p/day | (4,200×£0.26)+ (365×£0.45)= £1,257 |
With higher usage, the cheaper unit rate often matters more, making Tariff 1 cheaper overall.
Important: Real tariffs can include different rates by region, and some multi-rate or time-of-use tariffs can outperform these examples if you can shift usage off-peak.
Costs, exclusions and common pitfalls (UK-specific)
A tariff that looks cheapest at a glance can end up costing more once you include standing charges, exit fees, or a mismatch with your meter and usage pattern.
1) Standing charge can dominate
If you use relatively little electricity (small flats, frequent travel), a higher standing charge may wipe out a low unit rate.
2) Exit fees and timing
Fixed tariffs often have exit fees. If you’re likely to move soon, a flexible tariff could be better even if it’s slightly pricier today.
3) Meter type restrictions
Economy 7 and some smart tariffs require specific meter setups. Choosing the wrong type can increase costs.
Green claims: what to look for
- REGO-backed renewable electricity (common baseline in the UK).
- Clear wording on whether the tariff supports new renewable generation (not always the case).
- Any carbon offset claims should be explained (what standard, what projects, and whether it’s in addition to REGOs).
Eligibility exclusions we commonly see
- Prepayment: fewer tariffs; some suppliers don’t support certain meters.
- Complex meters (e.g., related to heat networks or restricted supply): limited switching options.
- Debt: you may need to arrange repayment first; rules vary by situation.
- Economy 7 usage split: if most power is used in the day, E7 can be a trap.
Price changes: Suppliers can launch and withdraw tariffs quickly. If a deal looks good, it’s worth checking again before you submit a switch. We aim to keep comparisons current, but live availability and acceptance can change.
FAQs: cheapest green electricity switching in the UK
Is green electricity more expensive in the UK?
Not always. Some renewable tariffs are priced competitively, and in some weeks they can be among the cheapest options. The best way to know is to compare total estimated annual cost for your postcode and usage, not just the “green” label.
What does “100% renewable electricity” usually mean?
Typically it means the supplier matches your electricity supply with renewable generation evidence using REGOs. It’s a recognised UK certificate system. It doesn’t mean your home is physically powered only by renewable generators at the moment you use electricity.
Can I switch if I rent?
Usually yes, as long as you pay the energy bills (you’re the account holder). You don’t normally need landlord permission to switch supplier, but if bills are included in rent or there’s a managed supply arrangement, you may not be able to change.
How long does an electricity switch take?
Switching timescales can vary, but many switches complete within a few working days. If there are meter details to validate or issues to resolve, it can take longer. Your supply shouldn’t be interrupted during the process.
Do I need a smart meter for the cheapest green deals?
Not necessarily. Many fixed green tariffs work with standard meters. However, some of the cheapest time-of-use or EV-focused tariffs require a smart meter to measure when you use electricity.
Will I pay exit fees if I’m on a fixed tariff?
Often yes, but it depends on your contract. Exit fees are commonly charged if you leave before the end date. Some suppliers waive fees in certain situations (for example, when you’re within a set window of the end of your contract). Always check your tariff terms.
Can I switch if I owe money to my current supplier?
Possibly, but it may be restricted. The rules depend on the type of meter, the amount owed, and whether you have an agreed repayment plan. If you’re unsure, compare options first, then speak to your current supplier or get independent guidance.
Is it better to switch electricity-only or dual fuel?
It depends. Dual fuel can be convenient, but not always cheapest. Sometimes the cheapest approach is mixing suppliers (electricity with one, gas with another). Comparing both ways is the easiest way to check.
Trust, methodology and sources
Editorial information
- Written by: EnergyPlus Editorial Team
- Reviewed by: Energy Specialist
- Last updated: May 2026
How we assess “cheapest green electricity this week”
We rank tariffs by estimated annual electricity cost (and where relevant, dual-fuel cost), using the rates and charges the supplier makes available for the customer’s region, meter type and payment method. We show the building blocks so you can sanity-check the result.
- Inputs used: postcode (region), tariff rates (unit + standing), payment method, meter type, estimated annual kWh usage.
- What “this week” means: results reflect tariffs and pricing available at the time you run your comparison; suppliers can change prices or withdraw deals quickly.
- Green classification: we label tariffs as renewable where suppliers state renewable supply backed by certificates (commonly REGOs). We also surface disclosed extra environmental features where available.
- What we don’t assume: we don’t assume you can shift usage to off-peak unless you select a time-of-use type; we don’t assume you’ll avoid exit fees.
Limitations: Estimated costs depend on your usage and tariff structure. If your actual kWh use differs materially (or you have multi-rate meters like Economy 7), your true costs may differ. Always read the supplier’s tariff information and terms before switching.
Independent UK sources we use
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