Cheapest green electricity tariff for UK homes (how to find it)
The “cheapest” green electricity tariff depends on your region, meter type and payment method. Use this guide to compare like-for-like and avoid paying extra for green claims that don’t suit your home.
- See what “green electricity” means in the UK (REGOs, tariffs and add-ons)
- Compare costs fairly: unit rate, standing charge, exit fees and discounts
- Get a whole-of-market quote based on your postcode and usage
Estimates only. Availability and prices vary by region, meter type, payment method and eligibility. Always check tariff terms, exit fees and how the supplier supports renewables.
Fast answer: what’s the cheapest green electricity tariff in the UK?
There isn’t one single cheapest green electricity tariff for every UK home. The best-priced option depends on your postcode (regional network costs), your meter type (standard, Economy 7, smart, prepayment), payment method (direct debit vs pay on receipt of bill), and whether the tariff is fixed or variable.
In practice, the cheapest “green” deal for most households is whichever whole-of-market tariff gives the lowest estimated annual cost once you include:
- Unit rate (p/kWh) and standing charge (p/day)
- Exit fees (if you might switch again before the end date)
- Discounts or add-ons (e.g. bundle deals, tracker premiums, “green add-on” costs)
- Eligibility rules (smart meter required, online-only billing, or new customers only)
Key takeaway: Don’t judge by headline unit rate alone. For many homes, a slightly higher unit rate but a much lower standing charge (or no exit fee) can be cheaper overall.
What “green electricity” usually means
Most UK green tariffs match your electricity use with renewable generation using REGOs (Renewable Energy Guarantees of Origin). Some tariffs go further by funding new renewable projects or buying power directly from generators.
Cheapest for you = based on your home
Prices vary across regions and meters. A tariff that’s cheapest in the North West may not be cheapest in London—so use a quote based on your postcode and usage.
Avoid common traps
Watch for high exit fees, time-of-use rates that don’t fit your routine, and “green add-ons” that increase bills without clear extra impact.
Compare green electricity tariffs (whole of market)
Tell us a few basics and we’ll show estimated costs for green electricity tariffs available for your home. You can compare fixed vs variable, check exit fees, and see whether a tariff requires a smart meter.
Privacy note: We use your details to provide quotes and contact you about your energy options. You can ask us not to call at any time.
Before you start: have these to hand (optional)
- Your current electricity usage in kWh (or a recent bill)
- Your tariff name and whether you’re in contract
- Meter type (smart / standard / Economy 7 / prepayment)
What you’ll see in results
- Estimated annual cost
- Based on your usage (or typical usage if you don’t know it).
- Unit rate + standing charge
- The two numbers that usually drive overall price.
- Tariff features
- Fixed end date, exit fee, smart meter requirements, paper billing fees, and payment options.
Get your green tariff quote
Enter your details for a tailored comparison. This helps us show tariffs available in your region.
Not sure if your tariff is “green”?
Check your supplier’s fuel mix disclosure and whether the tariff uses REGOs. If the supplier claims added environmental impact (beyond REGOs), look for clear details on what they fund and how much.
Compare green electricity tariffs: the factors that change the price
Use the table below to compare tariffs in a way that reflects real bills. If you’re comparing quotes from different sites, make sure they’re using the same usage, region, meter type and payment method.
| What to compare | Why it matters | Quick check |
|---|---|---|
| Estimated annual cost | Combines standing charge + unit rate using a usage estimate. Best single number to shortlist. | Is your kWh usage right? Is it electric-only or dual fuel? |
| Unit rate (p/kWh) | Affects every kWh you use. Crucial for high-usage or electric heating homes. | Is it single-rate or day/night (Economy 7 / time-of-use)? |
| Standing charge (p/day) | You pay it regardless of usage. Often the deciding factor for low-usage flats. | Multiply by 365 to see the annual fixed cost. |
| Tariff type (fixed / variable / tracker) | Fixed offers price certainty; variable can change; tracker may move frequently with a formula. | Do you need predictable bills? Can you tolerate rate changes? |
| Exit fees | You may pay to leave early. Important if prices fall or you plan to move. | Is the fee per fuel? Is it waived near contract end? |
| Meter & payment rules | Some tariffs require a smart meter, online account, or direct debit for the best rates. | If you’re prepayment or Economy 7, check the tariff supports it. |
| Green claims (REGOs vs added impact) | Two tariffs can both be “100% renewable” yet differ in how they source or fund renewables. | Does the supplier explain what they buy/fund beyond REGOs? |
Decision checklist: who the cheapest green electricity tariff tends to suit
Likely to suit you if…
- You pay by direct debit and can do paperless billing
- You can commit to a fixed term (or the exit fee is low)
- Your usage is stable, so a fixed price helps budgeting
- You’ve checked your standing charge isn’t unusually high
May not suit you if…
- You’re likely to move home soon (exit fee risk)
- You’re on Economy 7 but can’t shift usage to night-rate hours
- You’re on prepayment and the tariff isn’t available for your meter
- You need paper bills or quarterly cash/cheque payments
Editor’s quick shortcut
Shortlist 3–5 green tariffs by estimated annual cost, then decide based on exit fees and whether the green credentials match what you care about (REGOs-only vs added funding for renewables).
Costs, exclusions and common pitfalls (UK-specific)
Green tariffs can be competitively priced, but the “cheapest” option can flip depending on fees, meter requirements and how you actually use electricity. Here are the main gotchas we see when people compare.
1) Standing charge dominates low usage
If you’re in a small flat or out of the property a lot, a high standing charge can outweigh a low unit rate. Compare the annualised standing charge (standing charge × 365).
2) Smart meter / online-only requirements
Some green time-of-use tariffs require a smart meter and mobile app. If you can’t or don’t want one, filter them out early to avoid disappointment.
3) Exit fees on fixed green deals
A fix can be good value, but exit fees matter if prices fall or you move. Check whether fees apply per fuel and whether they reduce near the end of the term.
4) “Green add-ons” that increase the bill
Some suppliers offer a paid green add-on. This can be worth it if you value the specific project funding, but it usually won’t be the cheapest option.
5) Economy 7 / time-of-use mismatch
Night rates only help if a meaningful share of your electricity use happens overnight (e.g. storage heaters, EV charging). Otherwise you can end up paying more.
6) Prepayment limitations
Not all green tariffs are available for prepayment meters. If you’re prepay, focus comparisons on tariffs that explicitly support your meter type.
Two realistic cost scenarios (illustrative only)
These examples show how “cheapest” can change depending on usage and standing charge. Numbers are illustrative estimates using a simple formula:
Annual cost ≈ (standing charge × 365) + (unit rate × annual kWh) (excluding discounts, fees, VAT rounding and any price changes).
Scenario A: low-usage flat (single occupant)
- Assumed usage: 1,800 kWh/year
- Tariff 1: 25p/kWh + 65p/day
- Tariff 2: 28p/kWh + 45p/day
Estimated annual cost:
- Tariff 1: (0.65×365)=£237.25 + (0.25×1800)=£450 → £687
- Tariff 2: (0.45×365)=£164.25 + (0.28×1800)=£504 → £668
Even with a higher unit rate, Tariff 2 wins due to the lower standing charge.
Scenario B: family home (higher usage)
- Assumed usage: 4,200 kWh/year
- Tariff 1: 25p/kWh + 65p/day
- Tariff 2: 28p/kWh + 45p/day
Estimated annual cost:
- Tariff 1: £237.25 + (0.25×4200)=£1,050 → £1,287
- Tariff 2: £164.25 + (0.28×4200)=£1,176 → £1,340
At higher usage, the lower unit rate matters more—Tariff 1 becomes cheaper.
These scenarios ignore potential exit fees, discounts, and any mid-contract price changes for variable/tracker tariffs.
FAQs: cheapest green electricity tariffs in the UK
Is green electricity more expensive in the UK?
Not always. Some green tariffs are priced competitively with standard tariffs, especially those that match usage with renewables via REGOs. Others cost more if they include added benefits (like funding new renewable projects) or if they’re linked to smart time-of-use pricing that doesn’t suit your usage pattern.
What does “100% renewable electricity” mean on a tariff?
Usually it means the supplier matches the electricity you use with renewable generation certificates (REGOs). Your home still receives electricity from the national grid, but the supplier buys evidence that an equivalent amount of renewable power was generated.
Do I need a smart meter for the cheapest green tariff?
Not necessarily. Many fixed or standard variable green tariffs don’t require a smart meter. However, time-of-use green tariffs (including EV-focused plans) often do. If you don’t have a smart meter, focus on tariffs that explicitly support standard meters or Economy 7 (if relevant).
Can I get a green electricity tariff if I’m on a prepayment meter?
Sometimes, but the choice can be narrower. Availability depends on the supplier, your meter type (traditional key/card vs smart prepay), and your region. If you’re prepay, it’s worth filtering quotes to tariffs that explicitly support prepayment to avoid wasted time.
Will switching to a green tariff cut my carbon footprint?
It can support renewable generation through certificate-backed purchasing, but the impact depends on what the supplier does beyond REGOs (e.g. long-term power purchase agreements, investment in new renewable capacity). If added impact matters to you, look for clear, specific evidence from the supplier.
What’s the difference between a fixed and variable green tariff?
A fixed tariff locks unit rates and standing charges for a set period (exit fees may apply). A variable tariff can change (often with notice). A tracker follows a published formula and can move more frequently. “Cheapest” depends on your risk tolerance and how long you expect to stay put.
How do regional electricity prices affect the cheapest tariff?
Suppliers price tariffs by region because network and distribution costs vary across Great Britain. That’s why the cheapest green tariff in one postcode area may not be cheapest elsewhere. A quote based on your postcode is the most reliable way to compare.
Are exit fees always bad?
Not always. An exit fee can be acceptable if the tariff’s overall price is strong and you’re confident you’ll stay for the term. If you might move, want flexibility, or expect to switch again soon, prioritise low or zero exit fees.
How we assess the “cheapest” green electricity tariff
Our core principle
We prioritise estimated annual cost for your home, not a single headline rate. We then surface the terms that most commonly change the true cost: standing charge, exit fees, discounts, and eligibility requirements.
What we mean by “green”
In UK tariff comparisons, “green electricity” typically refers to renewable matching via REGOs. Where a supplier claims added environmental impact, we encourage users to check published details (e.g. funding, PPAs, investment commitments).
Limitations & caveats
- Prices vary by region and can change (especially variable/tracker).
- Not all tariffs are available for all meter types (e.g. prepayment).
- Your actual bill depends on real usage, billing periods, and any future price changes.
Editorial trust signals
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- April 2026
Sources (UK)
- Ofgem (energy regulator guidance on tariffs, switching and consumer protections)
- Citizens Advice energy advice (switching, billing and complaints)
- GOV.UK (consumer rights, energy and environment information)
Where supplier-specific green claims are mentioned in quotes, we recommend verifying them on the supplier’s own tariff pages and fuel mix disclosures.
Ready to find the cheapest green electricity tariff for your home?
Get a tailored quote based on your postcode and usage, then compare unit rates, standing charges and exit fees side by side.
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