Cheapest green electricity tariff for UK homes (how to find it)
The “cheapest green” tariff depends on your region, meter type and how suppliers prove the electricity is renewable. This guide shows what to look for, what to avoid, and how to compare whole-of-market offers.
- Clear definitions: renewable tariffs, REGO-backed claims, and “green” add-ons
- What usually drives the cheapest price (and when it doesn’t)
- Two realistic household examples with estimated annual costs
Prices are estimates and change frequently. Eligibility can vary by region, meter type, and payment method.
Fast answer: what’s the cheapest green electricity tariff in the UK?
There isn’t one national “cheapest green” electricity tariff for every home. The lowest-cost green option for you depends on:
Where you live
Electricity is priced by region (distribution area). The same tariff can cost different amounts in different postcodes.
Your meter & usage
Smart meters can unlock time-of-use rates. High usage homes can benefit from lower unit rates even if the standing charge is higher.
How “green” is defined
Many tariffs are backed by certificates (REGOs). Some also fund new renewables or include additional carbon reduction projects.
Key takeaway: If you want the cheapest renewable-backed electricity, compare whole-of-market tariffs for your postcode and meter type, then check how the supplier supports its “green” claim (e.g., REGO-backed matching, additional funding, or specific renewable generation).
What “cheapest” usually means in practice
- Lowest estimated annual cost for your usage (unit rate + standing charge).
- Fits your payment method (monthly direct debit vs prepay).
- Fits your meter (single-rate, Economy 7, smart time-of-use).
What can make a “cheap” tariff expensive
- High standing charges (especially for low users).
- Time-of-use rates that don’t match your habits.
- Exit fees if you switch again soon.
- Introductory discounts that end after a set period (check the term).
Compare the cheapest green electricity tariffs for your home
Tell us a few details and we’ll compare whole-of-market home energy tariffs, including renewable options. We’ll highlight important terms like meter eligibility, tariff length and exit fees where available.
Tip: If you have a smart meter (or are getting one), mention it. Some of the lowest-priced renewable electricity deals can be time-of-use tariffs where you pay less at certain hours.
What you’ll need (2 minutes)
- Your postcode (prices vary by region)
- An email and phone number so we can send results and help if you want
- Rough idea of your electricity usage (kWh) or bill amount (optional, but improves accuracy)
Get your quote
What we mean by “green electricity” on this page
In the UK, suppliers commonly evidence renewable electricity claims using Renewable Energy Guarantees of Origin (REGOs). Some tariffs go further (for example, investing in new renewable generation or offering additional environmental support). We recommend checking the supplier’s fuel mix and green claims before switching.
Compare tariff types: what’s usually cheapest for green electricity?
Use this table to narrow down the type of tariff most likely to be cheapest for your situation. Exact prices vary by supplier, region, and when you switch.
| Tariff type | Best for | Watch-outs | Green check |
|---|---|---|---|
| Fixed (12–24 months) | Households wanting price certainty; often competitive when wholesale prices rise. | Exit fees; may miss future price drops; check how long the fix lasts. | Look for supplier fuel mix and REGO-backed matching. |
| Variable (standard/rolling) | Flexibility; people likely to switch again soon. | Rates can change; not always the cheapest month-to-month. | Confirm renewable evidence and any “green add-on” cost. |
| Time-of-use (smart meter) | EV charging, flexible appliance use, or households home at off-peak times. | Peak rates can be high; you need to shift usage to benefit. | Check whether off-peak is truly low and how “green” is defined. |
| Economy 7 / two-rate | Homes with storage heaters or significant overnight electricity use. | Day rates often higher; wrong fit can increase costs. | Confirm the renewable claim and whether it applies to all usage. |
Decision checklist (quick)
- Pick “cheapest green” based on:
- Estimated annual cost (unit rate + standing charge) for your usage, not headline p/kWh alone.
- Meter eligibility (smart/time-of-use, Economy 7, prepay).
- Tariff length, exit fees, and whether prices are fixed or variable.
- How the supplier substantiates “renewable” (e.g., REGOs, investments, published fuel mix).
Who this approach suits (and who it doesn’t)
- Suits: most households that want renewables and a low bill, and are happy to compare suppliers.
- May not suit: anyone who can’t switch (e.g., landlord controls supply in some setups), or people who need a specific support scheme beyond tariff choice.
- Worth extra care: prepayment customers, Economy 7 users, and smart time-of-use customers (because the “cheapest” depends heavily on usage pattern).
Important: In the UK, your home’s physical electricity supply comes from the national grid mix. A “green tariff” typically means your supplier matches what you use with renewable generation evidence (often via REGOs) and/or invests in renewable projects.
Costs, exclusions and common pitfalls (UK-specific)
The cheapest-looking green tariff can be the wrong choice if you miss a detail. These are the most common reasons households end up paying more than expected.
Standing charge vs unit rate
Low unit rates can be paired with higher standing charges. If you’re a low user (small flat, often away), this can wipe out savings.
Region and payment method
Prices vary by region and sometimes by payment type. Always compare using your postcode and your likely payment method (often monthly direct debit).
Meter eligibility (smart, Economy 7, prepay)
Some tariffs require a smart meter, or won’t work with Economy 7. Prepay availability can also be limited and priced differently.
Exit fees and contract length
Fixed deals may include exit fees. If you switch frequently, a slightly higher tariff with no exit fees could work out cheaper overall.
Scenario 1: Small flat, low usage (single-rate)
Assumptions (example only): 1–2 bed flat, electricity only for appliances; 1,800 kWh/year; monthly direct debit; single-rate meter; illustrative rates.
| Example tariff | Unit rate | Standing charge | Estimated annual cost |
|---|---|---|---|
| Green Tariff A (lower unit, higher standing) | 26p/kWh | 70p/day | ~£722/year |
| Green Tariff B (higher unit, lower standing) | 28p/kWh | 50p/day | ~£687/year |
Even though Tariff A has the lower unit rate, the higher standing charge makes it cost more for a low-usage household.
Scenario 2: Family home with EV (smart time-of-use)
Assumptions (example only): 3–4 bed home; 4,200 kWh/year total; smart meter; can shift 30% of usage to off-peak (including EV charging); illustrative rates.
| Example tariff | Peak | Off-peak | Estimated annual cost |
|---|---|---|---|
| Green Fixed Single-rate | 27p/kWh | — | ~£1,236/year |
| Green Time-of-use (30% off-peak) | 32p/kWh | 12p/kWh | ~£1,118/year |
If you can reliably move usage to off-peak hours, time-of-use green tariffs can be cheaper overall. If you can’t, the higher peak rate can cost more.
Scenario caveat: These figures are illustrative calculations to show how pricing structure works. Your actual costs depend on your region, exact tariff rates, and your real usage split across peak/off-peak periods.
“Green” claim pitfalls to watch for
REGO-only vs additionality: Some tariffs mainly purchase certificates; others invest in new renewables. Decide what matters to you: lowest cost, or additional environmental impact.
“Green add-ons”: A tariff might be standard electricity with an added monthly cost for an environmental contribution. Check the total estimated annual cost.
Time-of-use complexity: Cheap off-peak windows vary by supplier. Confirm the exact hours and whether they match your routine (and your EV charger schedule if relevant).
FAQs: cheapest green electricity tariffs (UK homes)
1) Are green electricity tariffs always more expensive?
Not always. Many suppliers price renewable-backed electricity competitively. Whether it’s “more expensive” depends on your region, standing charge, and tariff type (fixed/variable/time-of-use) rather than the green label alone.
2) Does a green tariff mean my home only receives renewable electricity?
No. Electricity delivered to your home comes from the grid mix. A green tariff usually means the supplier matches your usage with renewable generation evidence (commonly REGOs) and/or supports renewable projects.
3) What is a REGO and why does it matter?
A REGO (Renewable Energy Guarantee of Origin) is a certificate issued for renewable electricity generated in the UK. Suppliers can use REGOs to evidence renewable claims. It matters because it’s often how “100% renewable electricity” is substantiated.
4) I’m on a prepayment meter. Can I get a cheap green tariff?
Sometimes, but choices can be more limited and priced differently than direct debit tariffs. It’s still worth comparing by postcode and meter type. If you’re struggling with energy costs, check support routes via Citizens Advice as well.
5) How do I know if a time-of-use tariff will actually be cheaper?
Estimate how much electricity you can shift to off-peak hours (EV charging, washing machine/dishwasher). If most use stays at peak times, the higher peak rate can outweigh off-peak savings. A smart meter is typically required.
6) Do green tariffs have exit fees?
They can do, especially fixed-term deals. Exit fees vary by supplier and product, and some variable tariffs have no exit fee. Always check the tariff information before switching.
7) Can tenants switch to a green electricity tariff?
Usually yes, if you pay the bills and have a standard domestic supply. If bills are included in rent or the landlord controls the energy contract for the whole building, you may not be able to switch. Ask your landlord/agent if you’re unsure.
8) Will switching to a green tariff disrupt my supply?
In most domestic switches, there’s no interruption to your electricity supply because the physical network doesn’t change. Your supplier changes on the billing side. Timescales and process can vary.
If you want the cheapest option: focus first on the estimated annual cost for your usage and region, then validate the supplier’s renewable credentials and tariff terms.
How we assess the “cheapest green electricity tariff” (methodology)
Our approach
- Cheapest = lowest estimated annual cost for your details (postcode/region, meter type, payment method, usage) using the supplier’s published rates at the time of comparison.
- Green = renewable-backed supply claim evidenced by the supplier (commonly via REGOs) and supported by publicly available fuel mix / disclosures.
- Quality checks include tariff length, exit fees (if applicable), eligibility constraints (smart meter, Economy 7, prepay), and any extra “green” add-on costs.
Limitations (being transparent)
- Prices can change quickly and may differ by region and availability.
- Your estimated annual cost depends on how accurate your usage estimate is.
- “Green” claims vary by supplier; two tariffs can both be “renewable” but differ in additional environmental impact.
- Some specialist tariffs may have eligibility rules (e.g., smart meter requirement, specific charging windows).
Editorial trust signals
- Written by:
- EnergyPlus Editorial Team
- Reviewed by:
- Energy Specialist (Domestic Markets)
- Last updated:
- May 2026
Sources (UK)
- Ofgem (UK energy regulator) — consumer information and market rules.
- Citizens Advice: energy — switching guidance and help for billing/meter issues.
- GOV.UK — government guidance and relevant schemes (where applicable).
We link to authoritative sources for policy and consumer rights. Individual tariff pricing and eligibility always come from suppliers and can change.
Ready to see your cheapest green electricity options?
Compare whole-of-market home tariffs for your postcode and meter type, then choose the renewable option that fits your budget and preferences.
Note: We can’t guarantee the cheapest tariff will always be available—prices and availability change. We’ll help you compare based on your details and the latest information we have.
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