EnergyPlus · May 2026

Cheapest green energy tariff UK homes (June 2026)

Almost every UK domestic supplier now sells a 100% renewable-electricity tariff in 2026, with REGO certificates as the standard proof. In May 2026 the cheapest green tariffs for typical homes sit at or just below the April–June Ofgem cap on electricity, with green gas (biomethane) usually carrying a small premium. This page covers what counts as ‘green’, which suppliers are cheapest in May 2026 and how to compare like-for-like.

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Editorial information, not financial advice. Prices and policy can change — always confirm against the supplier and Ofgem.

Cheapest UK green energy tariffs — June 2026 snapshot

On a typical 2,700 kWh electricity / 11,500 kWh gas profile, the cheapest 100% renewable electricity tariffs in May 2026 sit roughly 2–5% below the April–June cap. Green gas (biomethane-backed) usually carries a small premium of £20–£60/year on typical use vs a standard gas tariff. Octopus, Good Energy, So Energy and Outfox the Market are among the most consistently green-marketed suppliers, but most majors offer a 100% renewable electricity option too.

Quick checklist (May 2026):

  • Cheapest 100% renewable electricity tariffs in May 2026: ~2–5% below cap on typical use.
  • Green gas (biomethane) premium: typically £20–£60/year on typical use.
  • REGO certificates are the standard renewable-electricity proof in the UK.
  • Octopus, Good Energy, So Energy, Outfox the Market are leading green-focused suppliers in 2026.
Last updated
May 2026
Reviewed by
Energy Specialist
Audience
UK households & small businesses

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Cheapest UK green energy tariffs for homes (June 2026)

A clear, current overview to help you choose with confidence.

What ‘green’ actually means in the UK

On the electricity side, a 100% renewable tariff means the supplier purchases enough REGOs (Renewable Energy Guarantees of Origin) to match your annual kWh. On the gas side, ‘green gas’ means biomethane backed by Renewable Gas Guarantees of Origin (RGGOs) for some portion of the kWh.

Where green sits on price

Renewable electricity is no longer a premium product on the wholesale market — most cheap fixes are now 100% renewable by default. Green gas is harder because biomethane is more expensive to produce, so it still carries a modest premium.

PPA-backed vs REGO-only

Some suppliers (Good Energy, Ecotricity, Octopus on selected tariffs) buy electricity from named UK renewable generators under PPAs. Others meet the 100% renewable claim by buying separately-traded REGOs. Both are legitimate; PPA-backed is the higher-integrity option.

Time-of-use green tariffs

Octopus Agile, Tracker and Outgoing Fixed remain 100% renewable on the import side and pay competitive SEG export rates. EV/heat-pump households can stack low overnight rates with renewable-backed import.

Compare like-for-like

Indicative May 2026 product comparison for UK households shopping green.

What to compare Typical range (May 2026) Notes
100% renewable electricity fix (REGO-backed) ~2–5% below cap Widely available; most majors offer one.
100% renewable electricity, PPA-backed At cap to ~2% below Higher integrity; Good Energy, Ecotricity, selected Octopus.
Green gas (biomethane-backed) Small premium £20–£60/yr typical Most green gas tariffs are partial-percentage biomethane, not 100%.
Octopus Agile / Tracker (renewable import) Variable, often below cap SMETS2 required; renewable on import side.
100% renewable + standard gas dual fuel At cap to ~5% below Common middle ground if you don't want the green-gas premium.

How to find the cheapest green energy tariff for your UK home (June 2026)

  1. 1. Decide what ‘green’ means to you

    REGO-backed electricity is the standard. PPA-backed is higher integrity. Green gas usually carries a premium.

  2. 2. Pull your annual kWh

    Take electricity and gas kWh from your last bill or your supplier's app.

  3. 3. Get whole-of-market green quotes

    Use the form on this page to surface 100% renewable electricity tariffs for your postcode.

  4. 4. Decide gas treatment

    Standard gas + renewable electricity is the cheapest combination. Green gas adds a modest premium for partial biomethane content.

  5. 5. Compare annual cost like-for-like

    Annual cost = unit rate × your kWh + standing charge × 365. The green claim doesn't change the maths.

  6. 6. Apply and submit reads

    Switch completes in 5 working days under Faster Switching.

Common pitfalls to avoid

The most frequent issues we see when households and businesses act on what looks like a good deal.

  • Picking on the word ‘green’ alone — ask whether the renewable claim is REGO-only or PPA-backed.
  • Paying a large premium for green gas where only a small percentage is actually biomethane.
  • Ignoring annual cost — a few pounds of premium is fine if the tariff still beats your current deal.
  • Switching to a green tariff and forgetting the standing charge — it still applies daily even if you use little energy.

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Frequently asked questions

Which UK supplier has the cheapest green energy tariff in June 2026?

On a typical 2,700/11,500 kWh dual-fuel profile, the cheapest 100% renewable electricity tariffs in May 2026 sit ~2–5% below the cap. The exact cheapest in your postcode depends on region — use the form on this page to compare. Good Energy, Octopus, So Energy and Outfox the Market are consistently competitive.

Is a green tariff more expensive than a standard one?

On the electricity side, no — most cheap fixes are now 100% renewable by default in 2026. On the gas side, green gas (biomethane) typically carries a modest premium of £20–£60/year on typical use vs standard gas.

What are REGOs?

REGOs (Renewable Energy Guarantees of Origin) are certificates issued for each MWh of renewable electricity generated in the UK. Suppliers match their customers' annual electricity use with REGOs to claim a 100% renewable tariff. They're tradeable and the most common green-claim mechanism.

What is the difference between REGO-backed and PPA-backed?

REGO-only suppliers buy certificates separately on the open market — the electrons may come from any source on the grid. PPA-backed suppliers have direct contracts with named renewable generators. Both are legitimate; PPA-backed is the higher-integrity claim.

Is green gas really 100% renewable?

Rarely. ‘Green gas’ tariffs typically blend a percentage of biomethane (with RGGOs) into the rest of the grid mix. A few suppliers offer 100% biomethane tariffs but they carry a larger premium. Read the small print before paying for green gas.

Can I have a green prepayment tariff?

An increasing number of PAYG tariffs are 100% renewable on electricity by default in 2026. Compare via the form on this page to check what's available in your postcode.

Does a green tariff cut my carbon footprint?

It drives demand for renewable generation and signals that you value low-carbon supply, which strengthens the case for new renewables. The biggest emissions wins remain insulation, heat pumps and EV charging on a green tariff.

Should I add solar PV to a green tariff?

Yes — self-generation is the lowest-carbon option. Pair the install with a Smart Export Guarantee tariff (Octopus Outgoing Fixed and EDF Export+ are strongest in May 2026) to maximise the value of any export.

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Page governance

Reviewed by
Energy Specialist
Last updated
May 2026

How we keep this page current

We refresh this page each month against the latest Ofgem cap, supplier tariff changes and current scheme guidance. Worked numbers are illustrative; quotes you receive via the comparison form are personalised to your meter and postcode.

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Updated on 19 Jun 2026