Cheapest green gas and electricity tariff in the UK (how to find it)
Green tariffs vary a lot by region, meter type and payment method. This guide shows what “cheap” and “green” usually mean in the UK, what to watch for, and how to compare like-for-like.
- Find tariffs that match your meter (smart, standard, Economy 7) and payment method
- Understand the difference between renewable electricity, green gas and biomethane claims
- Compare unit rates, standing charges, contract length and exit fees—before you switch
Prices are estimated and change frequently. Availability depends on your postcode, meter type and credit checks (where applicable).
Fast answer: the “cheapest green” tariff depends on your postcode and meter
There isn’t one UK-wide cheapest green gas and electricity tariff. The lowest estimated cost for you will depend on:
What changes the price most
- Region (distribution area): standing charges and unit rates vary
- Meter type: single-rate, Economy 7, smart/half-hourly
- Payment method: Direct Debit vs pay-on-receipt vs prepayment
- Usage level: standing charges matter more for low use
- Tariff structure: fixed vs variable, exit fees, discounts
What “green” commonly means in the UK
- Electricity: supplier matches your electricity with renewable generation certificates (e.g., REGOs)
- Gas: often a blend or an offset-style product; some include a % of biomethane
- Proof: look for clear fuel mix disclosure, scheme details and how claims are evidenced
Quick takeaway: The cheapest green tariff for you is usually the one with the lowest estimated annual cost (unit rates + standing charge) that also meets your expectations on renewables evidence, contract terms and service. Compare on your actual meter and payment method—don’t rely on headline “from” prices.
Compare whole-of-market green tariffs for your home
Tell us a few basics and we’ll match you to available green electricity and green gas options for your postcode and meter type. You’ll see estimated costs and key terms side-by-side.
What happens next
- We identify tariffs available in your area and for your meter/payment method
- We show estimated annual costs using your inputs (or typical usage where needed)
- You choose a tariff and we guide you through switching (no interruption to supply)
Renting? You can usually switch if you pay the energy bills and your tenancy agreement doesn’t include energy as part of rent. If you have a prepayment meter or a managed building supply, options can be more limited.
Prefer to read first? Jump to our tariff comparison table and the common pitfalls.
Get a tailored quote
Use your own details for the most accurate estimates. We’ll only use these to provide your quote and switching support.
What counts as a “green” electricity and gas tariff?
Green electricity
Most UK green electricity tariffs are backed by renewable certificates (often REGOs). This supports renewable claims, but it doesn’t mean the electricity delivered to your home is physically traceable to a wind or solar farm.
Green gas
“Green gas” usually means a supplier buys biomethane certificates or offers a tariff with a stated biomethane proportion. Some tariffs include carbon offsetting. The details vary significantly—always read the tariff and fuel mix information.
What to look for
- Clear explanation of evidence (REGOs/biomethane certificates)
- Fuel mix disclosure and sustainability claims
- Whether any “green gas” element is an add-on cost
Practical tip: If your priority is a low-carbon home, consider pairing a green electricity tariff with efficiency improvements (draught-proofing, insulation) and—where feasible—heat pump planning. For many homes, reducing gas use has the biggest impact.
Tariff types compared (so you can spot the cheapest for you)
Use this table to compare the most common green tariff structures. The “cheapest” option is usually the one that best matches your usage pattern and risk tolerance.
| Tariff type | How pricing works | Who it can suit | Common catch |
|---|---|---|---|
| Fixed green dual fuel | Unit rates + standing charges are fixed for a set term (often 12–24 months). | Households wanting bill stability and predictable budgeting. | May include exit fees if you leave early; fixed rates can become uncompetitive if market prices fall. |
| Variable green tariff | Supplier can change prices (often with notice). May track or sit near the Ofgem price cap where applicable. | Those who want flexibility and low commitment. | Costs can rise; “cap” isn’t a guarantee of the lowest deal. |
| Economy 7 / multi-rate green | Different day/night rates. Best value depends on how much you use off-peak. | Homes with storage heaters, EV charging overnight, or high off-peak use. | If your off-peak share is low, it can be more expensive overall. |
| Green gas add-on | Electricity tariff is green; gas may be standard unless you pay extra for biomethane/offset elements. | Those who want to choose their level of “green gas” contribution. | Add-ons can increase the effective unit cost—compare the total annual estimate. |
Decision checklist: what to compare
- Unit rate(s) for electricity and gas (p/kWh)
- Standing charges (p/day) for both fuels
- Contract length and exit fees
- Payment method assumptions (Direct Debit vs other)
- Green credentials: what evidence is used, and what the tariff actually includes
- Service factors: reviews, billing options, smart meter support
Who “cheapest green dual fuel” usually suits
- Likely to suit
- You pay by Direct Debit, you want renewable electricity, and you’re happy with a fixed term (or a well-priced variable) after checking standing charges in your region.
- May not suit
- You’re on a prepayment meter, you need maximum flexibility, you’re moving soon, or you rely on Economy 7 and the tariff’s off-peak rates don’t align with your usage.
Two realistic examples (with numbers you can adapt)
These examples show how a tariff that looks “cheapest” on unit rate can lose out once standing charges, meter type and your usage are considered. Figures are illustrative, not a live market quote.
Scenario A: Low-use flat (standing charges dominate)
- Payment: Direct Debit
- Electricity use: 1,800 kWh/year
- Gas use: 6,000 kWh/year
- Meter: single-rate electricity
| Illustrative tariff | Rates used | Estimated annual cost |
|---|---|---|
| Tariff 1: low unit rates, high standing | Elec 25p/kWh + 65p/day Gas 6p/kWh + 35p/day |
Elec: (1,800×£0.25)+ (365×£0.65)= £687 Gas: (6,000×£0.06)+ (365×£0.35)= £488 Total: £1,175 |
| Tariff 2: slightly higher unit, lower standing | Elec 27p/kWh + 45p/day Gas 6.5p/kWh + 28p/day |
Elec: (1,800×£0.27)+ (365×£0.45)= £651 Gas: (6,000×£0.065)+ (365×£0.28)= £492 Total: £1,143 |
Even though Tariff 1 has lower unit rates, Tariff 2 can be cheaper for low usage because standing charges take a bigger share of the bill.
Scenario B: Economy 7 household (off-peak share matters)
- Payment: Direct Debit
- Total electricity use: 4,200 kWh/year
- Off-peak share: 45% (1,890 kWh off-peak / 2,310 kWh day)
- Gas: 10,000 kWh/year
| Illustrative tariff | E7 electricity rates used | Estimated annual electricity cost |
|---|---|---|
| Tariff A: strong off-peak rate | Day 33p/kWh Night 14p/kWh Standing 55p/day |
(2,310×£0.33)+(1,890×£0.14)+(365×£0.55)= £1,228 |
| Tariff B: lower day rate, weaker off-peak | Day 30p/kWh Night 20p/kWh Standing 52p/day |
(2,310×£0.30)+(1,890×£0.20)+(365×£0.52)= £1,260 |
Tariff A can work out cheaper when you genuinely shift a large share of usage to night. If your off-peak share drops, Tariff B (or even a single-rate tariff) may win.
Important: These are simplified illustrations. Real tariffs can include different regional standing charges, time-of-use windows, discounts, and varying terms. Always compare the estimated annual cost for your own postcode and meter type.
Costs, exclusions and common pitfalls (so the “cheapest” stays cheap)
A green tariff can look great at first glance, then disappoint when the full terms are applied. Here are the main gotchas UK households run into.
Standing charge surprises
Some tariffs offset low unit rates with higher standing charges. This can be especially costly for low-use homes and small flats.
Exit fees and contract terms
Fixed tariffs often include exit fees. If you may move home, or you like to switch frequently, check the early termination terms before choosing.
Meter/payment eligibility
Not every tariff is available for prepayment meters, Economy 7, or non-Direct Debit payment methods. Some suppliers also apply credit checks.
Green claims: what to confirm
- Is the electricity claim supported by clear certificate reporting?
- Is “green gas” a defined biomethane percentage or an offset-style promise?
- Is any environmental contribution included in the unit rate or charged separately?
- Where can you read the supplier’s fuel mix disclosure and policy?
If you’re currently in debt
Switching supplier can be restricted if you owe your current supplier money—especially above certain thresholds or if you’re on a prepayment meter. If that’s you, check guidance and speak to your supplier. Citizens Advice explains your options and support routes.
Quick “before you switch” checklist
- Take (or download) recent meter readings and check your current tariff end date
- Confirm whether you have Economy 7/multi-rate electricity and the off-peak times
- Compare total estimated annual cost (not just unit rates)
- Check exit fees, billing frequency, customer service and app support if important to you
- Read how the supplier defines and evidences “green” for both fuels
FAQs
Is there a single cheapest green tariff for the whole UK?
No. Energy prices vary by regional network charges, meter type and payment method. A tariff that’s cheapest in one area can be beaten elsewhere—especially if standing charges differ.
Do green tariffs cost more?
Not always. Some suppliers price green electricity competitively; others add a premium. The only reliable way to tell is to compare the estimated annual cost for your postcode and usage.
What’s the difference between renewable electricity and carbon offsets?
Renewable electricity claims are typically supported by renewable certificates (e.g., REGOs). Offsetting is separate: it aims to compensate for emissions through funded projects. Tariffs may include one, the other, or both—check the supplier’s explanation.
Can I get “green gas” through my existing boiler?
Your boiler will still burn natural gas delivered through the grid. “Green gas” tariffs typically involve biomethane certificate matching, a blend commitment, or offsetting. The mechanics vary, so look for clear terms.
Will switching interrupt my supply?
In normal circumstances, no. Your energy is delivered through the same pipes and wires. Your supplier and billing change, not your physical connection. If any action is needed, your new supplier will tell you in advance.
I’m on a prepayment meter—can I switch to a green tariff?
Sometimes, but options can be more limited. Some tariffs are Direct Debit only, and switching may be restricted if you have outstanding debt. Comparing with your exact meter type will show what’s available.
Do I need a smart meter for the cheapest green tariffs?
Not necessarily. Many competitive tariffs are available without one, but some time-of-use products require smart or half-hourly readings. If you have a smart meter, you may see more options.
What information should I have ready to compare accurately?
Your postcode, current supplier/tariff (if known), payment method, meter type (single-rate/Economy 7/smart), and either your annual kWh usage or a recent bill. This helps produce a like-for-like estimate.
Trust, transparency and how we assess “cheapest green”
Page details
- Written by: EnergyPlus Editorial Team
- Reviewed by: Energy Specialist
- Last updated: May 2026
How we assess this (methodology)
When we say “cheapest green tariff”, we mean the tariff that delivers the lowest estimated annual cost for a given household profile, while meeting a user’s stated preference for green electricity and (where chosen) green gas features.
- Cost basis: unit rates (p/kWh) + standing charges (p/day) for electricity and gas, multiplied by annual usage assumptions.
- Availability filters: postcode/region, meter type (single-rate, Economy 7/multi-rate, smart/half-hourly where applicable), and payment method (e.g., Direct Debit vs prepayment).
- Terms considered: contract length, exit fees, and key eligibility restrictions where provided.
- Green criteria: we look for clear supplier explanations of renewable electricity backing (commonly via certificates) and, for green gas, whether the tariff specifies biomethane/certificates/offset-style elements.
Limitations and why results can differ
- Prices change: suppliers can update tariffs; fixed deals come and go quickly.
- Your usage matters: estimates can be higher/lower than your bills depending on how much energy you use and when.
- Regional charges differ: standing charges and unit rates vary across Great Britain regions.
- Green definitions vary: “green gas” especially can mean different things across suppliers; always read the tariff terms and fuel mix information.
Sources and further reading
- Ofgem (UK energy regulator) — consumer protections, price cap information and market guidance
- Citizens Advice: energy — switching, billing, complaints and debt support
- GOV.UK: energy advice and services — grants, schemes and official guidance
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