Cheapest green energy tariff for home (UK): how to find it
Green tariffs can be good value, but the “cheapest” option depends on your postcode, meter, payment method and how much energy you use. This guide shows how to compare like-for-like and switch with confidence.
- See what “green” really means (and what it doesn’t)
- Compare unit rates, standing charges and contract terms
- Get a whole-of-market quote tailored to your home
Estimates only. Prices and eligibility vary by region, meter type and payment method. Always check the tariff information label before switching.
Fast answer: what’s the cheapest green energy tariff in the UK?
There isn’t one single “cheapest green tariff” for everyone in the UK. Prices vary by region (your postcode), meter type (standard vs Economy 7 vs smart/prepay), payment method (Direct Debit vs prepayment), and whether you want electricity-only green or dual fuel.
What to do: The cheapest “green” option is the tariff with the lowest estimated annual cost for your usage once you compare: unit rate(s) + standing charge + discounts/credits + exit fees + contract length. Use a whole-of-market comparison to avoid being steered to a narrow panel.
Key takeaways (UK-specific)
- “100% renewable electricity” is about matching supply with certificates (REGOs in Great Britain) rather than a direct cable from a wind farm to your home.
- Green gas is different: it may include biomethane or carbon offsets and can cost more. Check the tariff’s fuel mix and claims.
- Standing charges matter (especially for low users). A slightly higher unit rate can still be cheaper overall if the standing charge is lower (and vice versa).
- Economy 7 and smart tariffs can be “cheap green” for some households, but only if your usage pattern fits (e.g., more night-time use).
- Exit fees and contract terms can wipe out small savings if you need flexibility (e.g., moving home).
Compare green tariffs (whole-of-market) and get a quote
Tell us a few details and we’ll compare eligible home energy tariffs, including green electricity options, based on your postcode and meter type. We’ll show the estimated annual cost so you can compare like-for-like.
Tip: If you have a recent bill, you can later cross-check unit rates (p/kWh) and standing charges (p/day). If you don’t, you can still compare using typical usage estimates.
What counts as “green” in our comparisons?
- Green electricity tariffs
- Usually marketed as “100% renewable electricity”. Suppliers commonly match electricity supply with renewable certificates (REGOs). Some tariffs also include direct investment or power purchase agreements (PPAs).
- Green gas / carbon offset tariffs
- May include a blend of biomethane or offsets. These can differ widely in price and approach—check the tariff label and supplier details.
Get your estimate
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Compare green tariffs: what to look at (not just the headline)
If you want the cheapest green energy tariff for your home, compare tariffs on total estimated annual cost and then verify the key line items below. A tariff that looks cheap for one household can be expensive for another once standing charges, night rates, or exit fees are included.
| What you’re comparing | Why it affects “cheapest” | Quick check | Who it often suits |
|---|---|---|---|
| Unit rate (p/kWh) | High users feel unit rate changes most. | Check electricity and gas separately; Economy 7 has day/night rates. | Medium/high usage households. |
| Standing charge (p/day) | Low users can overpay on high standing charges even with a low unit rate. | Multiply by 365 and add to your estimate. | Everyone, especially low users/empty properties. |
| Tariff type (fixed/variable/time-of-use) | Fixed can protect against rises; variable can drop but may rise too. Time-of-use depends on when you use energy. | Check contract length and when the fix ends. | Fixed: budgeters. TOU: flexible users with smart meters. |
| Green claim (renewable electricity / green gas / offsets) | Two tariffs can cost the same but have different “greenness”. | Look for the tariff fuel mix and explanation of certificates/offsets. | People prioritising renewables transparency. |
| Payment method (Direct Debit / prepay) | Pricing and availability can differ; some deals are Direct Debit only. | Confirm you’re comparing the same payment method. | Direct Debit: widest access. Prepay: limited options. |
| Fees & perks (exit fee, credit, rewards) | A £50–£100 exit fee can outweigh small savings. Credits can be conditional. | Check exit fees per fuel and any end-date conditions. | People staying put for the full contract term. |
Decision checklist: who a “cheap green tariff” suits (and who it doesn’t)
Often a good fit if you…
- Pay by monthly Direct Debit and can pass a standard credit check (where required).
- Know your approximate kWh usage (or have a bill to hand).
- Want renewable electricity and are happy with certificate-backed renewables.
- Can commit to a fixed term and won’t need to exit early.
- Have a smart meter (helpful for smart/time-of-use deals, not required for most fixes).
Be cautious if you…
- Are on prepayment (availability can be narrower; check eligibility before switching).
- Have Economy 7 but don’t use much electricity overnight (night rates may not help).
- Need flexibility because you’re moving home soon (exit fees may apply).
- Want “green gas” and assume it means 100% biomethane (often it’s a blend or offset-based).
- Are in debt to your current supplier (you may still be able to switch, but rules vary and you should check first).
Two realistic examples (with numbers)
These scenarios show how “cheapest” changes with usage and standing charge. They are illustrative estimates using simplified maths: annual cost ≈ (unit rate × annual kWh) + (standing charge × 365). Real tariffs can include more than one unit rate (e.g., Economy 7) and other terms.
Scenario A: Low electricity user in a flat (electricity-only)
- Assumptions: 1,800 kWh/year electricity; single-rate meter; Direct Debit.
- Tariff 1 (Green Fix): 25.0p/kWh, 60p/day standing charge.
- Tariff 2 (Green Variable): 26.0p/kWh, 45p/day standing charge.
Estimated annual cost:
Tariff 1 ≈ (0.25×1,800) + (0.60×365) = £450 + £219 = £669
Tariff 2 ≈ (0.26×1,800) + (0.45×365) = £468 + £164 = £632
Even with a higher unit rate, Tariff 2 is cheaper for a low user because the standing charge is lower.
Scenario B: Family home on dual fuel (medium usage)
- Assumptions: 3,100 kWh/year electricity and 12,000 kWh/year gas; Direct Debit.
- Tariff 1 (Green Fix): Elec 25.0p/kWh + 55p/day; Gas 6.2p/kWh + 32p/day; exit fee £50 per fuel.
- Tariff 2 (Green Fix): Elec 26.2p/kWh + 45p/day; Gas 6.0p/kWh + 35p/day; no exit fee.
Estimated annual cost:
Tariff 1 ≈ Elec (0.25×3,100)+(0.55×365)=£775+£201=£976
Gas (0.062×12,000)+(0.32×365)=£744+£117=£861
Total ≈ £1,837 (plus potential exit fees if you leave early)
Tariff 2 ≈ Elec (0.262×3,100)+(0.45×365)=£812+£164=£976
Gas (0.060×12,000)+(0.35×365)=£720+£128=£848
Total ≈ £1,824 (no exit fee in this example)
These totals are close: in practice you’d also consider price certainty, service, and the risk/cost of exit fees.
Costs, exclusions and common pitfalls (UK)
Most disappointment comes from comparing the wrong things (e.g., unit rate only) or missing eligibility details (e.g., meter type). Use the checks below before you switch.
1) “Green” labels aren’t all equal
Some tariffs are backed by REGOs; others claim additional investment or UK renewables sourcing. For gas, “green” may mean a small biomethane blend or offsets.
2) Economy 7 can backfire
If you don’t shift enough electricity to night hours (storage heaters, EV charging, timers), you can pay more overall than a single-rate tariff.
3) Prepayment options can be limited
Some suppliers and deals are not available for prepay meters. If you have smart prepay, availability may differ versus traditional key/card meters.
4) Exit fees and renewal rates
A cheap fixed tariff can have exit fees. Also check what happens at the end of the fix—many roll onto a standard variable tariff unless you switch again.
5) Regional price differences
Standing charges and unit rates vary by region. A deal your friend has elsewhere may not exist or may be priced differently for your postcode.
6) Discounts and credits can be conditional
Bill credits may require you to stay to a certain date, pay by Direct Debit, or be applied after several months. Always read the tariff terms.
Quick pre-switch check (2 minutes)
- Confirm your meter type (single rate, Economy 7, smart, prepay).
- Compare on estimated annual cost using your kWh (or a typical estimate if you don’t know it).
- Verify unit rates and standing charges for your region and payment method.
- Check contract length, exit fees, and any discount conditions.
- Read the supplier’s explanation of their renewable/green claims.
FAQs: cheapest green energy tariffs (UK)
Is a green electricity tariff always more expensive?
No. Some renewable electricity tariffs price competitively, and the cheapest option can be green depending on your region and meter. Always compare the total estimated annual cost rather than assuming green costs more.
What does “100% renewable electricity” mean in the UK?
It usually means the supplier matches the electricity supplied to customers with renewable certificates (REGOs in Great Britain). The electricity delivered to your home comes from the national grid mix, but the supplier supports/claims renewable generation through certificate matching. Some suppliers go further with PPAs or investment—check their explanation.
Can I get a cheap green tariff on a prepayment meter?
Sometimes, but options can be more limited than Direct Debit. Availability and pricing can depend on whether you have a traditional prepay meter or smart prepay. If you’re considering changing meter type, check with your supplier about eligibility and any fees or appointment requirements.
Will I need a smart meter for green tariffs?
Not for most green fixed or variable tariffs. You may need a smart meter for smart/time-of-use tariffs that price electricity differently by time (useful for EV charging or shifting usage).
What should I check before switching to a green fixed tariff?
Check: unit rates and standing charges for your region; contract length; exit fees per fuel; payment method; any bill credits and their conditions; and how the supplier defines “green” for electricity and gas. If you’re renting, you can usually switch supplier if you pay the bills—check your tenancy agreement for any restrictions.
Does switching affect my energy supply?
Your energy supply stays on during a switch—there’s no physical interruption in normal circumstances. The main changes are billing, customer service, and your tariff rates/terms. You’ll typically get a final bill from your old supplier and start paying the new supplier from the switch date.
Can I switch if I’m in debt to my current supplier?
Possibly. Rules and options can differ depending on the type and level of debt and whether you’re on prepay. If you’re unsure, get advice and check your supplier’s process before starting a switch.
How quickly do green tariff prices change?
Variable tariffs can change (often with notice) while fixed tariffs generally keep the same unit rates and standing charges for the fixed term. Market changes and supplier pricing decisions can affect availability, so it’s worth comparing again before renewal.
How we assess “cheapest green energy tariff” (methodology)
Our definition of “cheapest”
We treat “cheapest” as the lowest estimated annual cost for an eligible tariff for your home, based on the information you provide (postcode, meter type, payment method and usage where available). We do not rank based on marketing claims or supplier brand alone.
What we include in cost estimates
- Electricity and/or gas unit rate(s) (p/kWh)
- Standing charges (p/day)
- Any stated bill credits/discounts where terms allow
- Contract length and exit fees (shown so you can judge risk)
Limitations (important)
- Estimates are not a guarantee: your actual bills depend on real usage, tariff changes (for variable), and meter reads/estimates.
- Eligibility varies: some tariffs may require Direct Debit, online billing, a smart meter, or certain meter configurations.
- Green claims vary: “100% renewable electricity” typically uses certificate matching. “Green gas” may involve offsets or partial biomethane. We encourage users to read the supplier’s disclosures.
- Regional pricing: electricity and gas costs vary by region; we use postcode-based regional rates where applicable.
Trust signals
Useful UK sources
- Ofgem (UK energy regulator) – guidance on switching, tariffs and consumer protections.
- Citizens Advice: Energy – practical consumer help, billing issues and complaints.
- GOV.UK – broader UK government guidance (including support schemes when available).
- Ofgem: back-billing rules – what happens if you’re billed late.
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