Cheapest green energy tariff UK (June 2026): how to find it

Green tariffs vary by region, meter type and payment method. This guide shows how to compare the cheapest options available to your home in June 2026, with clear assumptions and a quick quote form.

  • Whole-of-market comparison: prices differ by postcode and supplier availability
  • Understand what “green” means (REGOs, renewable tariffs, green gas)
  • See realistic cost scenarios and a decision checklist before you switch
Get your green tariff quote How we assess “cheapest”

Prices are estimated and depend on your usage, region, meter type and payment method. “Cheapest” here means lowest estimated annual cost for your details at the time of comparison.

Fast answer: what’s the cheapest green energy tariff in the UK (June 2026)?

There isn’t one single “cheapest green tariff” for everyone in June 2026. UK energy pricing is location- and customer-specific, so the cheapest green tariff for your home depends on:

Your postcode (region)

Unit rates and standing charges vary across Great Britain (and are different again in Northern Ireland).

Meter type

Credit, prepayment, smart meters and Economy 7 can all price differently and affect eligibility.

Payment method & usage

Direct Debit is often cheapest; your annual kWh drives the “cheapest” result more than the headline unit rate.

Key takeaway: The cheapest green tariff is the one with the lowest estimated annual cost for your address and usage, after checking standing charge, exit fees and whether the tariff is truly green (how it’s backed).

If you want the cheapest possible

Compare whole-of-market prices for your postcode and usage, then filter for renewable electricity tariffs and check fees/terms before switching.

If you want the greenest possible

Look beyond “100% renewable electricity” claims and check whether the supplier invests in new renewables and how they use certificates (REGOs).

Compare green tariffs available to your home

To identify the cheapest green tariff for June 2026, you need a comparison based on your region and usage (not a national headline rate). Our form collects the minimum details required to show accurate estimates.

What you’ll see: estimated monthly and annual costs, key tariff terms (fixed/variable), and green credentials notes where available. Terms and availability can change quickly.

Before you start (2-minute checklist)

  • Have a recent bill? Great—use your annual kWh if you know it.
  • Know your meter type? Smart / credit / prepay / Economy 7 matters.
  • In a fixed term? Check for exit fees and the end date.
  • Renting? You can usually switch if you pay the bill—your landlord doesn’t need to be the account holder.

What “green tariff” can mean in the UK

100% renewable electricity backed by REGOs
Common in the UK: suppliers match customer electricity with renewable certificates (REGOs). This can still be a legitimate claim, but it doesn’t always mean your supplier is building new renewables.

Green gas / carbon offset add-ons
“Green gas” is often a mix of biomethane, certificates, or offsets. It can be higher cost and varies widely between tariffs—check the details.

Get a green tariff quote

Enter your details to compare whole-of-market green tariffs. We’ll use your postcode to find prices available in your area.

Start your comparison

By submitting, you confirm this is for a UK home energy comparison. We’ll use your details to provide quotes and contact you about your comparison. You can opt out at any time.

Important: If you’re on a prepayment meter, in debt to your current supplier, or have an Economy 7/10 setup, options can be more limited. We’ll highlight compatible tariffs where possible.

Comparison table: what to check when choosing the cheapest green tariff

Use this table to judge value beyond the headline “100% renewable” label. The cheapest tariff for you is usually the lowest estimated annual cost that still meets your green preference and practical needs.

Factor What it means Why it changes “cheapest” What to look for
Standing charge Daily fixed cost (electricity and/or gas) High standing charge can outweigh a lower unit rate for low users Compare annual cost using your usage; don’t judge by unit rate alone
Unit rate(s) p/kWh; may be single-rate or day/night (Economy 7) Night rate only helps if you can shift use (storage heaters, EV charging) Check your meter setup and day/night split before choosing E7
Tariff type Fixed (price guaranteed for term) vs variable (can change) A slightly higher fixed price can reduce risk of increases Check term length and when rates can change
Exit fees Charge for leaving a fixed tariff early Can wipe out savings if you expect to switch again soon Look for £0 exit fee if you want flexibility
Green claim How “renewable” is evidenced (e.g., REGOs) and what’s included Some “green” tariffs cost more because they include extras Prefer clear disclosure: REGOs, green gas details, investment claims
Payment method Direct Debit, cash/cheque, prepayment Direct Debit often priced lower; prepay tariffs may be fewer Select the payment method you’ll actually use

Who the cheapest green tariff usually suits

  • You can pay by Direct Debit
  • You want renewable electricity without extra add-ons
  • You’re happy with standard customer service channels (digital-first)
  • You can tolerate price change risk (variable) or accept a fixed term

Who it may not suit

  • You strongly prefer tariffs that fund new renewable projects (often not the cheapest)
  • You need paper billing or specific support needs (some low-cost suppliers are app-only)
  • You’re on prepayment or complex metering (options can be narrower)
  • You expect to move home soon and want zero exit fees

Costs, exclusions and common pitfalls (green tariffs)

Green tariffs can be great value, but there are a few UK-specific “gotchas” that regularly catch people out—especially when you’re hunting for the cheapest.

Pitfall 1: judging by unit rate only

If standing charges are high, a “cheap per kWh” green tariff can be more expensive overall—especially for low usage homes and flats.

Pitfall 2: missing exit fees

Fixed green tariffs may charge to leave early. If you may switch again within the term, a £0 exit fee can matter more than a small price difference.

Pitfall 3: “green gas” assumptions

Not all green tariffs include greener gas. Where included, it may be biomethane, certificates or offsets—check what you’re paying for.

Two realistic cost scenarios (illustrative)

These examples show why the “cheapest” result changes depending on usage and standing charge. They are not a quote.

Assumptions for both scenarios: Great Britain; Direct Debit; single-rate electricity; estimated prices typical of the market; VAT included; no discounts; no future price changes assumed.

Scenario A (low user flat, electric only)
Usage: 1,800 kWh/year
Tariff Green A: unit 26p/kWh, standing 62p/day → estimated annual: £854
Tariff Green B: unit 29p/kWh, standing 40p/day → estimated annual: £818
Result: even with a higher unit rate, Green B is cheaper due to a lower standing charge.

Scenario B (family home, gas + electricity)
Electricity: 3,600 kWh/year; Gas: 12,000 kWh/year
Dual Fuel Green C: elec 24p/kWh + 55p/day; gas 6.2p/kWh + 32p/day → estimated annual: £1,711
Dual Fuel Green D: elec 25p/kWh + 43p/day; gas 6.5p/kWh + 28p/day → estimated annual: £1,720
Result: for higher users, unit rates can matter more than standing charge; small changes can flip which tariff is cheapest.

Eligibility exclusions to watch (UK-specific)

Prepayment meters
Some green tariffs are credit-meter only. You may still have options, but fewer—compare specifically for prepay.
Economy 7 / multi-rate meters
If you have a day/night meter, ensure the tariff supports multi-rate pricing; otherwise your bills can rise.
Debt and switching blocks
If you owe money, switching can be restricted in some circumstances. Get advice before initiating a switch.
Northern Ireland
NI’s market works differently to Great Britain. If you’re in NI, comparisons and suppliers differ.

Tip: If you’re not sure about your meter type, look at your bill for “single rate”, “two rate/Economy 7”, or ask your current supplier. Getting this right prevents inaccurate comparisons.

FAQs: cheapest green energy tariffs (UK)

1) Are green energy tariffs always more expensive in the UK?

Not always. Some renewable electricity tariffs price competitively. Whether it’s cheaper depends on standing charges, payment method, and whether the tariff includes extras (like green gas or additional contributions).

2) Does “100% renewable electricity” mean my home only uses renewable power?

In the UK, electricity comes from the grid mix. “100% renewable” typically means the supplier matches your usage with renewable certificates (such as REGOs). It’s a contract and accounting mechanism, not a direct wire to a wind farm.

3) Can I switch to a green tariff if I rent?

Usually yes, if you’re the person responsible for paying the energy bill. If bills are included in rent or the landlord is the account holder, you typically can’t change supplier without their agreement.

4) Will switching affect my smart meter?

Smart meters generally keep working after you switch, but features can vary depending on meter model and supplier systems. If you have a smart meter, tell the supplier and check the tariff supports smart readings and billing.

5) Is there a penalty for switching energy supplier in the UK?

Not usually for variable tariffs. For fixed tariffs, there may be an exit fee if you leave early. Always check tariff terms—especially if you may move or switch again within the term.

6) Are green tariffs covered by the Ofgem price cap?

The price cap applies to standard variable tariffs in Great Britain (and some default tariffs), not to all fixed deals. A green tariff could be fixed or variable; whether it’s capped depends on the tariff type and your circumstances.

7) What details do I need to find the cheapest green tariff?

At minimum: your postcode, whether you want electricity-only or dual fuel, your meter type (single rate / Economy 7 / prepay), payment method, and your annual usage (kWh) if you have it.

8) Can a green tariff include gas, and how green is it?

Some suppliers offer “green gas” elements, but it varies: biomethane, certificates, or carbon offsets. Read the tariff description carefully and compare the cost impact.

How we assess the cheapest green energy tariff (and our limits)

Our definition of “cheapest” (for this page)

We treat “cheapest” as the lowest estimated annual cost for a given set of customer inputs (postcode/region, meter type, payment method, and usage), among tariffs labelled as renewable/green electricity.

  • Estimated annual cost includes unit rates and standing charges (and VAT where shown by suppliers).
  • Tariff eligibility matters: we exclude tariffs you can’t take due to meter/payment constraints.
  • Fees (like exit fees) are highlighted because they affect true cost if you switch again early.

Limitations & caveats

  • Prices and availability can change daily; some deals are limited to new customers or certain regions.
  • “Green” claims vary; some tariffs rely on certificates (REGOs), others include additional environmental contributions.
  • Northern Ireland comparisons differ from Great Britain due to a different market structure.
  • Individual circumstances (debt, complex metering, tenancy arrangements) can restrict switching.

Editorial trust signals

Reviewed by
Energy Specialist (UK household energy markets)
Last updated
June 2026

If you spot something that looks out of date (for example, a tariff withdrawn), please compare again using your postcode—results can shift quickly.

Sources (UK)

We also use supplier tariff information and published terms when available. Links above are provided for independent consumer guidance.

Ready to find the cheapest green tariff for your postcode?

Get a whole-of-market comparison with clear estimated costs and key terms. No misleading promises—just options available to your home in June 2026.

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Updated on 13 Apr 2026