Cheapest green electricity tariff switch (UK guide)

Find low-cost green electricity tariffs you can actually switch to, without the guesswork. We explain what “green” means in the UK, what affects price (region, meter, payment), and how to compare like-for-like.

  • See what makes a tariff genuinely “green” (and what doesn’t)
  • Compare estimated costs on your details (postcode, meter type, payment method)
  • Switch with confidence: exit fees, fixed terms, eligibility and common pitfalls explained
Get your green tariff quote How switching works

Estimates vary by supplier, region, meter type and payment method. Always check tariff terms, standing charges and any exit fees before you switch.

Fast answer: what’s the cheapest green electricity tariff to switch to?

In the UK, the cheapest green electricity tariff for you is usually the one with the best combination of unit rate (p/kWh) and standing charge (p/day) for your region and meter—not necessarily the one with the loudest “100% renewable” label.

Important: Most “green” tariffs in Great Britain are backed by renewable certificates (REGOs). Some go further by buying power directly from UK generators or investing in new renewables. Cheapest and “greenest” are not always the same thing.

Key takeaways (UK-specific)

Price depends on your postcode

Electricity networks vary by region, so standing charges and unit rates can change even on the same tariff.

Meter type matters

Smart, standard credit, Economy 7 and prepayment tariffs can price differently. Economy 7 can be cheaper only if enough use is off-peak.

“Green” is a spectrum

Look for clear claims: REGOs, UK generator matching, and whether the supplier funds new renewable projects.

Compare green tariffs now See what to check before you choose

Compare and switch: get an estimated cheapest green tariff

Tell us a few basics and we’ll match you to available whole-of-market home energy tariffs (where possible), including green electricity options. Your quote depends on:

  • Postcode (sets your electricity distribution region and standing charges)
  • Payment method (Direct Debit is often cheaper than standard credit; prepayment differs)
  • Meter type (standard, smart, Economy 7, prepayment)
  • Tariff type (fixed vs variable; exit fees can apply on fixed)

Good to know: “Green electricity” usually refers to how suppliers match electricity with renewable certificates and procurement, not that your home receives separate renewable electrons.

How switching works (UK)

  1. You choose a tariff and provide your details.
  2. Your new supplier contacts your current supplier—no need to cancel.
  3. Cooling-off period applies (typically 14 days for distance sales).
  4. Your supply stays on throughout; you’ll be asked for meter readings (unless smart readings are used).

If you’re in a fixed deal, check exit fees and whether you’re within the penalty-free switching window (often near the end of the contract—terms vary).

Get your quote (starts with postcode)

We’ll use this to show tariffs available in your area. Fields marked required help us contact you about your quote.

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.

Comparison table: what “cheap green electricity” can mean

Use this to decide which type of green tariff is most likely to be the cheapest for you while still meeting your environmental expectations. Availability varies by supplier and region.

Option type How it’s “green” (typical) Best for Watch-outs Often cheapest when…
Green variable Renewable matching via REGOs; supplier may buy renewables in the market. Flexibility; no long commitment. Rates can change; check standing charge. You want to switch again soon or avoid exit fees.
Green fixed (12–24m) REGOs and/or supplier’s renewable purchasing approach. Budget certainty if your usage is stable. Exit fees may apply; check end date and any auto-rollover. Fix rates are competitive and you’ll stay for the term.
Green + “added impact” May include extra investment in renewables, tree-planting, or UK generator PPAs. Those prioritising additional environmental claims. Can cost more; verify claims and where funds go. You’re willing to pay a small premium for extra initiatives.
Economy 7 green Green matching applies, but prices split into day/night rates. Homes with storage heating or lots of overnight charging. If most use is daytime, it can be more expensive. You can shift a meaningful share of use to off-peak (often 30–40%+).

Quick decision checklist

This usually suits you if…

  • You can pay by Direct Debit and pass a credit check (supplier rules vary).
  • You’re not tied into a fixed tariff with high exit fees.
  • You’re happy with REGOs-backed green electricity (or you can compare “added impact” options).
  • Your current standing charge is high and you want to see alternatives.

This may not be ideal if…

  • You’re on prepayment and need the widest access to top-up options (availability varies).
  • You have Economy 7 but your usage is mostly daytime.
  • You’re moving home very soon (you might prefer flexible terms).
  • You need to avoid any risk of price changes—then consider a fixed tariff (but check exit fees).

Costs, exclusions and common pitfalls (so your “cheap” stays cheap)

Green tariffs can look cheap until you factor in standing charges, payment method, and contract terms. Here’s what to check before you switch.

1) Standing charge vs unit rate

If you use less electricity (small flats, single occupants), a low unit rate can be outweighed by a higher standing charge. Compare estimated annual cost, not just p/kWh.

2) Exit fees on fixed tariffs

Fixed green tariffs may include exit fees. If you might move or switch again soon, check the fee and any penalty-free window near the contract end.

3) Economy 7 assumptions

Economy 7 can be cheaper only if enough consumption is at night. If your heating is gas and you’re home in the day, it can cost more.

4) Payment method restrictions

Some of the cheapest tariffs assume Direct Debit. Prepayment and standard credit tariffs can be priced differently and may have fewer “green” options.

5) “Green gas” vs green electricity

This page is about electricity. If you’re comparing dual fuel, check how “green gas” is defined (often carbon offsetting or biomethane matching).

6) Intro deals and later prices

If a deal includes a discount or bonus, find out how long it lasts and what happens afterwards (variable rates can change).

Reality check on “100% renewable”: Your home draws from the national grid mix. Suppliers typically match customer use with renewable certificates and procurement. If you want extra confidence, look for suppliers that explain their renewable purchasing and publish fuel mix and environmental disclosures.

Two realistic switching scenarios (with numbers)

These examples show how the cheapest green tariff can change depending on usage and charges. Figures are illustrative and not a promise; actual quotes vary by region, supplier, and timing.

Scenario A: Low usage flat (single rate)

Assumptions
Annual use: 1,800 kWh. Payment: Direct Debit. Single-rate meter. Region: varies (example only).
Tariff 1 (Green variable)
Unit rate 26p/kWh, standing charge 60p/day.
Tariff 2 (Green fixed)
Unit rate 28p/kWh, standing charge 45p/day.
Estimated yearly cost Electricity use Standing charge Total
Tariff 1 1,800 × £0.26 = £468 365 × £0.60 = £219 £687
Tariff 2 1,800 × £0.28 = £504 365 × £0.45 = £164 £668

Even with a higher unit rate, Tariff 2 comes out cheaper here because the standing charge is lower—common for lower-usage homes.

Scenario B: Higher usage home (Economy 7)

Assumptions
Annual use: 4,200 kWh. 35% off-peak (1,470 kWh) and 65% peak (2,730 kWh). Payment: Direct Debit.
Tariff 1 (Single rate green)
29p/kWh, standing charge 55p/day.
Tariff 2 (Economy 7 green)
Day 33p/kWh, night 15p/kWh, standing charge 55p/day.
Estimated yearly cost Usage cost Standing charge Total
Tariff 1 4,200 × £0.29 = £1,218 365 × £0.55 = £201 £1,419
Tariff 2 (2,730 × £0.33) + (1,470 × £0.15) = £1,122 365 × £0.55 = £201 £1,323

Economy 7 can win if you can reliably shift enough usage off-peak. If your off-peak share drops (for example, below ~25–30%), it may stop being cheaper.

Tip: When comparing tariffs, use your annual kWh from bills (or a smart meter app) rather than “typical use”. It’s the quickest way to find the cheapest option for your household.

FAQs: cheapest green electricity tariffs (UK)

1) Is 100% renewable electricity really possible in the UK?

Your home uses electricity from the national grid. “100% renewable” tariffs typically mean the supplier matches the amount you use with renewable generation evidence (often REGOs) and their purchasing. It doesn’t mean a separate wire delivers only renewable electricity to your property.

2) What makes a green tariff cheaper or more expensive?

Price is driven mainly by wholesale costs, network charges (which vary by region), operating costs, and how the tariff is structured (standing charge, unit rates, fixed vs variable). A “greener” proposition that includes extra initiatives may cost more, but not always.

3) Can I switch if I rent?

Usually yes, as long as you pay the energy bills and your tenancy agreement doesn’t include energy as part of the rent. If you have a landlord-managed supply, you may not be able to change supplier without their agreement.

4) Will switching affect my smart meter?

In most cases smart meters continue to work after a switch, but features can vary by supplier and meter setup. If smart readings aren’t compatible, you may need to provide manual readings temporarily.

5) Are green tariffs available for prepayment meters?

Sometimes, but choice can be narrower and pricing can differ. If you’re moving from prepayment to Direct Debit, you may need to meet eligibility checks and clear any debt (supplier rules vary).

6) What is a standing charge and why is it so high?

A standing charge is a daily amount that covers fixed costs like maintaining energy networks and metering. It varies by region and can change over time. A tariff with a slightly higher unit rate but a lower standing charge may be cheaper for low-usage households.

7) Should I choose fixed or variable for the cheapest green tariff?

It depends on your risk preference and how competitive the fixed deal is at the time you switch. Fixed tariffs offer price certainty for the term but may include exit fees. Variable tariffs are more flexible but prices can change. Always compare the estimated annual cost and check the terms.

8) How do I check if a supplier’s green claims are credible?

Look for clear, specific information: fuel mix disclosures, whether they use REGOs, whether they buy power from named renewable generators, and whether they fund new renewable capacity. If claims are vague (“eco-friendly”) without detail, treat them cautiously.

Trust, methodology and sources

Page accountability

Reviewed by
Energy Specialist
Last updated
May 2026

How we assess “cheapest green electricity”

We focus on what changes the price for UK households and what changes the credibility of a tariff’s environmental claims. Our comparisons are designed to help you avoid common traps.

  • Like-for-like costing: we compare using unit rate (p/kWh) and standing charge (p/day) against a stated annual usage (kWh).
  • UK constraints: we account for regional pricing differences, meter types (including Economy 7 and prepayment), payment method, and fixed-term conditions such as exit fees.
  • Green criteria: we explain typical UK “green tariff” structures (including REGOs) and highlight where tariffs may include additional environmental actions.
  • User-first caveats: we highlight where the cheapest choice can change (for example, low usage vs high usage, or off-peak proportion on Economy 7).

Limitations: Tariff availability and prices can change daily. We can’t show every tariff to every user because eligibility can depend on credit checks, meter setup, supplier capacity, and your exact address history. Always confirm the final tariff details before switching.

Sources (UK)

We may also refer to supplier tariff terms and fuel mix disclosures where relevant. If you spot something out of date, please contact us so we can review it.

Ready to find your cheapest green electricity tariff?

Compare estimated costs using your postcode, meter type and payment method—then switch only if the tariff terms look right for you.

Start my green tariff comparison Re-read the key checks

EnergyPlus is a home energy comparison service. Savings are not guaranteed and depend on your tariff eligibility and usage.

Back to Guides & FAQs



Updated on 16 May 2026