Cheapest green energy tariff in the UK right now (what to check first)

What to do now (2 minutes)

1. Get today’s green quotes for your postcode and meter.
2. Sort by estimated annual cost (not just unit rate).
3. Check: exit fees, tariff type (fixed/variable), payment method, and how the supplier defines “green”.

Key takeaways (UK-specific)

• Standing charges vary by region and can outweigh a cheaper unit rate for low users.
• Prepayment options are limited and can price differently from direct debit.
• “100% renewable electricity” is usually evidenced via REGOs; ask what’s included.
• Green gas usually means a blend (often biomethane/offsets) and costs more.

When a “cheap green” tariff may not be best

• If it has high exit fees and you might move.
• If you’re a low user and the standing charge is steep.
• If you need prepay and the tariff is credit-only.
• If you want additionality (direct generation support) rather than certificate-backed claims.

Compare today’s cheapest green tariffs for your home

Because energy pricing is regional, the most helpful answer is personalised: we’ll show estimated annual costs for green tariffs available to you, using your postcode, meter type and contact details so we can send your results and help if you want to switch.

Two realistic cost scenarios (with assumptions)

Get your quote (whole of market)

Enter your details to see the cheapest green tariffs for your home. We’ll email your results and, if you want, help you switch.

Decision checklist: who a cheap green tariff suits

• You can pay by monthly direct debit (typically widest choice).
• You want a lower estimated annual cost and are comfortable with REGO-backed renewable electricity.
• Your meter type matches (standard credit, smart, Economy 7 where supported).
• You’re happy with online account management (often linked to cheaper prices).

Who it may not suit (or needs extra checks)

• You’re in rented accommodation and may move within the fixed term (exit fees matter).
• You’re on a prepayment meter or can’t switch to direct debit.
• You have very low usage — standing charge dominates, so “cheapest unit rate” may mislead.
• You want “additionality” (directly supporting new renewables) — you may prefer specialist tariffs that can cost more.

1) Standing charge shock

Low users can pay more on a tariff with a lower unit rate but a higher daily standing charge. Always compare using your annual kWh.

2) Exit fees and moving home

Fixed deals can include exit fees per fuel. If you might move, check whether the supplier allows you to take the tariff with you or charges to leave.

3) Prepayment limitations

Some of the cheapest green tariffs are credit-only. If you’re on prepay, check whether you have a smart prepay meter and whether the tariff supports it.

4) Economy 7 / time-of-use mismatch

If you have Economy 7 (or a time-of-use tariff), your day/night split matters. A “cheap” single-rate tariff can increase costs for storage heaters.

5) “Green gas” expectations

Most homes can’t get 100% biomethane all the time through the gas network. Many “green gas” tariffs use a blend and/or carbon offsets. Read the breakdown.

6) Discounts that don’t last

Some tariffs show an attractive initial price that changes after a set period. Look for the end date and what happens at renewal.

Is there a single cheapest green tariff across the whole UK?

No. Energy prices vary by region (your local electricity distribution area) and can also vary by meter type and payment method. The “cheapest” option is best identified by comparing estimated annual cost for your postcode and usage.

What does “100% renewable electricity” mean in the UK?

Typically it means the supplier matches the electricity you use with renewable generation certificates (REGOs) over a year. The power delivered to your home is still from the national grid mix, but the supplier evidences renewable sourcing through certificates.

Are green tariffs always more expensive?

Not always. Some renewable electricity tariffs are priced competitively, especially those backed by REGOs. Tariffs that include higher-cost “green gas”, additional environmental contributions, or specific renewable sourcing models may cost more.

Can I get a cheap green tariff on a prepayment meter?

Sometimes, but choice can be narrower and prices may differ from direct debit. If you have a smart prepayment meter you may have more options. Always filter quotes by your actual meter and payment type so the results are realistic.

Do I need a smart meter to get the cheapest green deal?

Not necessarily. Many standard tariffs don’t require a smart meter. However, some tariffs (especially time-of-use deals) may require a smart meter to measure when you use electricity.

What should I check before switching to the cheapest green tariff?

Check: (1) unit rate and standing charge, (2) tariff type and length, (3) exit fees, (4) payment method assumptions, (5) meter compatibility (including Economy 7), and (6) how the supplier supports their “green” claim (REGOs, green gas details, offsets).

Will switching affect my supply or require an engineer visit?

In most cases, no. Your energy supply stays on during a switch and you normally don’t need an engineer visit just to change supplier. If a new meter is needed (for example, smart meter installation), that’s arranged separately.

Is it safe to switch if I’m in debt to my current supplier?

It depends on the type of debt and meter arrangement. Some debts can be moved via debt assignment for prepayment meters, but there are rules and limits. If you’re unsure, it may be best to get advice first from Citizens Advice or your current supplier.

Our definition of “cheapest”

We treat “cheapest” as the lowest estimated annual cost for a specific household profile, based on unit rates (p/kWh) + standing charges (p/day) and the user’s stated or typical consumption.

What makes it “green” in this guide

We refer to tariffs marketed as renewable/green by the supplier. Where possible we highlight the type of backing mentioned (for example, REGOs for electricity; biomethane/offsets for gas). We encourage users to verify the supplier’s fuel mix and environmental claims.

Key assumptions (and limitations)

• Prices vary by region, meter type and payment method; any examples on this page are illustrative.
• Estimated annual cost depends on consumption (kWh). If your usage differs, the “cheapest” option may change.
• Some tariffs require eligibility checks (credit, smart meter, online-only billing).
• Environmental impact is complex; certificate-backed tariffs may not directly fund new generation.

Trust signals

Written by

EnergyPlus Editorial Team

Reviewed by

Energy Specialist

Last updated

April 2026

Sources (UK)

• Ofgem (the energy regulator) — consumer guidance and market rules
• Citizens Advice: energy — switching, billing and support with payments
• GOV.UK: energy bills and prices — official information on support and energy policy

We also cross-check tariff terms shown during quote journeys against supplier documentation where available.