Cheapest green electricity tariff for UK homes (how to find it)
The cheapest green electricity tariff is the one that matches your meter, region and payment method — and meets your definition of “green”. Compare whole-of-market options in minutes, with clear caveats.
- See estimated costs for 100% renewable electricity tariffs (terms vary by supplier)
- Filter by region, meter type (incl. smart/prepay), and tariff type (fixed/variable)
- Understand REGO certificates, fuel mix disclosures, and what “green” can mean in practice
Estimates only. Availability, prices and “green” credentials vary by postcode, meter type, payment method and supplier terms.
Fast answer: what’s the cheapest green electricity tariff?
There isn’t one single “cheapest green tariff” for everyone in the UK. Prices depend on your postcode (region), meter type (credit, smart, prepay), payment method (direct debit, cash/card), and how much electricity you use. The cheapest option is the tariff with the lowest estimated annual cost for your usage that also meets your expectations of “green”.
What “green” usually means
Often: supplier matches your usage with renewable generation using REGO certificates. Some tariffs go further via long-term power purchase agreements (PPAs) or ownership of renewable assets.
How to spot good value
Compare the unit rate (p/kWh), standing charge (p/day), tariff type (fixed/variable), and any exit fees — for your region and meter.
Best next step
Run a quick whole-of-market quote using your postcode and usage (or a recent bill). You’ll see estimated costs and can choose a green tariff that fits.
Key caveat: The electricity delivered to homes comes from the national grid mix. “Green electricity” tariffs typically mean suppliers buy enough renewable certificates/generation to match what customers use, not that electrons to your home are exclusively renewable.
Compare green electricity tariffs (whole of market)
Use the form to request a quote. We’ll compare available home energy tariffs for your area and meter type, then show options that include renewable electricity. You’ll be able to weigh up price, contract length, and key terms.
What you’ll need (takes ~2 minutes)
- Your postcode (determines your electricity region)
- An email and optional phone number for results
- If you have it: annual kWh from a recent bill (otherwise we’ll estimate)
Good to know: Not every supplier is available in every region, and some tariffs are limited to certain meter types (for example, specific smart meter setups or prepayment meters).
Two realistic examples (with assumptions)
These scenarios show how “cheapest” can change once standing charge and unit rate are applied to different usage patterns. Numbers are illustrative (not a promise) and exclude any future price changes.
Scenario A: Low user in a flat (single-rate)
- Assumed usage
- 1,800 kWh/year electricity
- Tariff 1 (low standing charge, higher unit)
- Standing charge 45p/day; unit rate 28p/kWh
- Tariff 2 (higher standing charge, lower unit)
- Standing charge 60p/day; unit rate 25p/kWh
- Estimated annual cost
-
Tariff 1: (365×£0.45) + (1,800×£0.28) ≈ £668
Tariff 2: (365×£0.60) + (1,800×£0.25) ≈ £669
For low usage, a lower standing charge can matter as much as the unit rate.
Scenario B: Higher user (e.g., home working)
- Assumed usage
- 4,200 kWh/year electricity
- Tariff 1
- Standing charge 45p/day; unit rate 28p/kWh
- Tariff 2
- Standing charge 60p/day; unit rate 25p/kWh
- Estimated annual cost
-
Tariff 1: (365×£0.45) + (4,200×£0.28) ≈ £1,340
Tariff 2: (365×£0.60) + (4,200×£0.25) ≈ £1,270
With higher usage, the cheaper unit rate often wins even if the standing charge is higher.
Assumptions: Single-rate electricity, no discounts beyond what’s in the rates, and no changes to prices during the period. In real quotes, rates vary by region and payment method, and fixed deals can include exit fees.
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What counts as a “green electricity tariff” in the UK?
In the UK, suppliers explain where their electricity comes from in their fuel mix disclosure. Many “100% renewable” tariffs are backed by Renewable Energy Guarantees of Origin (REGOs), which certify that renewable electricity was produced somewhere in the UK or Europe.
- REGO-backed matching: Supplier buys certificates to match customer usage.
- Direct sourcing (often via PPAs): Supplier contracts directly with renewable generators.
- Additionality claims: Some tariffs say they support building new renewables; check how this is evidenced.
If “green” matters to you beyond price, look for clear statements about sourcing, REGOs, and independent environmental commitments. Supplier marketing language can differ from the underlying evidence.
Compare options: cheapest vs “best-fit” green tariffs
Use this table to decide what to prioritise. The cheapest green electricity tariff for your home will usually be a trade-off between unit rate, standing charge, contract terms and how you define “green”.
| What you’re comparing | Cheapest focus (typical) | Green credentials focus (typical) | Best for |
|---|---|---|---|
| Tariff type | Fixed or variable — whichever is currently lower for your region | Often fixed, sometimes with clearer sourcing statements | Households wanting price certainty vs flexibility |
| Standing charge | May be higher if unit rate is very low | Varies; not a reliable indicator of “greenness” | Low users should pay close attention |
| Unit rate | Key driver for medium/high users | Can be slightly higher depending on supplier and contract structure | Electric-only homes, home workers, EV charging (where applicable) |
| Exit fees | Sometimes present on the cheapest fixed deals | Can be present too — check before committing | Anyone likely to move home or switch again soon |
| Evidence of renewables | May be REGO-backed “100% renewable” without much detail | Clear fuel mix, REGOs, sourcing, and environmental commitments explained | Customers who prioritise transparency |
Decision checklist: quickest way to choose
- Do you want fixed (price certainty) or variable (flexibility)?
- Is the quote for your exact meter type (credit/smart/prepay)?
- Which matters more for you: standing charge or unit rate?
- Any exit fee and what’s the contract length?
- Does the supplier explain how they back “100% renewable”?
- Are there any billing/app features you rely on (paper bills, smart meter readings, customer service options)?
Who the cheapest green tariff usually suits (and who it doesn’t)
Often suits you if…
- You can pay by monthly direct debit
- You’re happy with online account management
- You’re comparing on estimated annual cost, not headline rates
May not suit you if…
- You need prepayment (tariff choice can be narrower)
- You expect no exit fees and want to switch frequently
- You want strong evidence of direct renewable sourcing, not only REGOs
If you’re on an older meter setup (e.g., legacy Economy 7 or complex switching history), it can be worth confirming meter details before switching to avoid delays.
Costs, exclusions and common pitfalls (UK-specific)
Most disappointment comes from comparing the wrong thing (headline unit rates), missing fees, or discovering a tariff isn’t available for your meter/payment type. Here’s what to check before you switch.
1) Standing charge can dominate
For low electricity users, the daily standing charge can make a “cheap unit rate” deal look better than it is. Always compare the estimated annual cost for your kWh.
2) Exit fees on fixed tariffs
Some fixed tariffs include exit fees if you leave early. If you may move home or switch again soon, prioritise no exit fee or a shorter term.
3) Payment method changes prices
Monthly direct debit is often priced differently from pay-on-receipt-of-bill or cash/card. Make sure the quote matches how you pay.
4) Meter type limits availability
Prepayment customers can have fewer green options. Economy 7/two-rate tariffs and certain smart configurations may need extra checks before switching.
5) “Green” labels vary
A tariff can be “100% renewable” via REGOs while the supplier’s overall fuel mix includes fossil generation. Read the supplier’s fuel mix disclosure and sourcing notes.
6) Add-ons can change the total
Some tariffs include perks (bundles, donations, carbon offsets). These can be meaningful — but make sure the core electricity cost still works for your budget.
Switching timing: You usually have a 14-day cooling-off period when switching online/at distance. If you’re on a fixed deal, check whether leaving triggers fees and whether your supplier offers a fee-free switching window near the end of your contract.
FAQs: cheapest green electricity tariffs (UK homes)
Is green electricity more expensive in the UK?
Not always. Some renewable-backed tariffs can be competitively priced, while others cost more due to contract structure, customer service model, or added “green” features. The only reliable way to tell is to compare the estimated annual cost for your postcode and usage.
Does “100% renewable electricity” mean my home gets only renewable power?
No. Electricity flows through the national grid; homes receive the grid mix. “100% renewable” tariffs usually mean your supplier matches what you use with renewable generation evidence (often REGOs), or contracts directly with renewables. The practical impact is about accounting and funding, not separate wires to your property.
Can I get a green tariff if I have a prepayment meter?
Sometimes, yes — but choice can be more limited than for direct debit customers. Availability depends on the supplier, your area, and whether your prepay meter is smart/top-up compatible. If you’re considering moving from prepay to credit, check eligibility and any debt rules first.
Will I be charged to switch electricity supplier?
Switching itself is usually free, but your current tariff may have an exit fee if you’re in a fixed contract. Check your latest bill or online account. Also consider any timing rules near the end of a fixed deal.
I’m a renter — can I switch to a green electricity tariff?
Usually yes if you’re the named bill payer, but there are exceptions (for example, if energy is included in rent, or the landlord has a specific arrangement). If you can switch, you normally must leave the meter and energy setup as you found it when you move out.
What’s the fastest way to lower my electricity costs without changing tariff?
Check your meter readings are accurate (especially if you’re on estimates), review your direct debit amount, and confirm you’re on the right meter setup (single-rate vs Economy 7). If you have a smart meter, using time-of-use tariffs may help, but only if your usage pattern fits.
Are green tariffs covered by the Ofgem price cap?
The price cap applies to certain default/standard variable tariffs and some prepayment tariffs, with rules set by Ofgem. Fixed tariffs are priced by suppliers and can be above or below the cap level. Always check the tariff type and terms when comparing.
What information should I check on the quote results?
Look for: your region, the standing charge and unit rate, estimated annual cost based on your usage, contract length, exit fees, payment method, and any notes about meter requirements. For “green” claims, check how the supplier describes renewable matching and their fuel mix disclosure.
Trust, methodology and sources
Page governance
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- May 2026
How we assess “cheapest green electricity tariff”
For households, “cheapest” should be judged on estimated annual cost for your expected kWh usage, not just the unit rate. We focus on the information that actually changes your bill:
- Availability: tariffs vary by postcode/region and supplier participation.
- Meter type: credit, smart and prepayment options can differ materially.
- Payment method: direct debit vs pay-on-receipt vs prepay pricing.
- Tariff type: fixed vs variable; contract length; exit fees.
- Green credentials: whether electricity is described as renewable-backed, and how (e.g., REGOs, PPAs). We encourage checking supplier disclosures.
Limitations: This guide cannot list a single national “cheapest” tariff because prices change and are personalised by region and customer details. Any examples on this page are illustrative calculations to help you understand trade-offs.
Independent sources we use (UK)
- Ofgem (energy regulator) — rules on switching, price cap guidance and consumer protections.
- Citizens Advice: energy — practical consumer help on bills, switching and complaints.
- GOV.UK: energy information — policy and official guidance where relevant.
Supplier-specific claims should be verified against supplier terms, tariff information labels, and fuel mix disclosures.
Find a cheaper green electricity tariff for your home
Compare whole-of-market options using your postcode and preferences. You’ll see estimated annual costs, contract terms and key caveats — so you can switch with confidence.
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