EnergyPlus · May 2026
Cheapest electricity tariff for flats in the UK (May 2026)
UK flats are unusual electricity customers: low annual kWh, often with no gas connection, and frequently on Economy 7 with storage heaters. That makes 'cheapest' very different by flat type. Since 1 April 2026 every supplier on the default tariff must offer a zero-standing-charge electricity variant under Ofgem's new mandate — a real win for very low-use flats. This page shows the cheapest tariff for each flat profile in May 2026 and explains the break-even maths so you switch to the deal that actually saves you money.
Editorial information, not financial advice. Prices and policy can change — always confirm against the supplier and Ofgem.
Cheapest flat electricity tariff — May 2026 at a glance
Gas-heated single-occupancy flat under ~1,800 kWh/year: the zero-standing-charge electricity variant (Ofgem mandate, April 2026) usually wins. Gas-heated couple flat (~2,000–2,400 kWh): a 12-month single-rate fix at 2–6% below the April–June 2026 cap usually wins. All-electric flat with storage heaters (3,500–7,000 kWh, much of it overnight): Economy 7 on a 12-month fix usually wins. All-electric flat without storage heaters: pick a single-rate fix.
Quick checklist (May 2026):
- Zero-standing-charge variant: cheapest for flats under ~1,800–2,200 kWh/year.
- 12-month single-rate fix: cheapest for typical 2,000–2,400 kWh flats.
- Economy 7 fix: cheapest for storage-heater flats with overnight load.
- Ofgem's April 2026 mandate added a zero-standing-charge variant at every supplier.
- Compare on annual cost, not unit rate — flats are very sensitive to standing charge.
- Last updated
- May 2026
- Reviewed by
- Energy Specialist
- Audience
- UK households & small businesses
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Annual kWh
Drives the unit-rate portion of your bill.
Meter type
Single-rate, Economy 7/10, smart, half-hourly all price differently.
Postcode & region
Standing charges and tariff availability vary by network region.
Term & start date
Fixes of 12/18/24/36 months trade certainty for flexibility.
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Cheapest electricity tariff for UK flats in May 2026
A clear, current overview to help you choose with confidence.
Why flats are different
Lower square footage, shared walls and ceilings, and often no garden mean flats use less electricity than houses on average. Ofgem's low-use TDCV benchmark of ~1,800 kWh/year matches many single-occupancy flats. That puts flats right at the no-standing-charge break-even — the group most likely to benefit from the April 2026 mandate.
Storage-heater flats need Economy 7
If your flat has night-storage heaters, your overnight kWh is typically 50–70% of total use. A single-rate tariff bills all of that at the day rate. Economy 7 splits day/night with a cheap off-peak window (usually midnight–7am, region-dependent) — for storage-heater flats it's almost always cheaper than single-rate.
The April 2026 zero-standing-charge mandate
Since 1 April 2026 every default-tariff supplier must offer at least one electricity variant with a zero standing charge. The unit rate is roughly 7–11p/kWh above the cap unit rate to recover network and metering costs. For flats below ~1,800–2,200 kWh/year, that trade pays.
Landlord-supplied electricity is different
If your flat's electricity is on a landlord-billed sub-meter (not a direct supply contract), you're a Heat Networks Act 2023 customer and the tariff is set by your landlord, not by you. The cheapest direct-supply tariffs in this guide do not apply until your flat has its own electricity supply contract.
Compare like-for-like
Indicative May 2026 view by flat type. Use the form on this page for a personalised comparison.
| What to compare | Typical range (May 2026) | Notes |
|---|---|---|
| Default tariff cap (Apr–Jun 2026) | Reference baseline | Cap unit rate + standing charge — the floor on standard variable tariffs. |
| Zero-standing-charge variant | Unit rate ~7–11p above cap, no daily charge | Cheapest for flats under ~1,800–2,200 kWh/year. Mandated since April 2026. |
| 12-month single-rate fix | ~2–6% below cap on typical flat use | Cheapest for typical 2,000–2,400 kWh single-rate flats. |
| Economy 7 fix | Day rate near cap, night rate ~9–14p/kWh | Cheapest for storage-heater flats with overnight load. Needs E7 meter. |
| Time-of-use (Agile, Pulse, Cosy) | Cheap off-peak, peak above cap | Suits flats with shiftable load (laundry, dishwasher, EV). SMETS2 required. |
How to pick the cheapest electricity tariff for a UK flat (May 2026)
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1. Identify your flat type
Gas-heated single occupancy, gas-heated couple, all-electric without storage heaters, or all-electric with storage heaters.
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2. Find your annual kWh
Use last year's bill or your supplier app — the most recent 12 months of electricity.
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3. Check your meter type
Single-rate, Economy 7 or SMETS2 — your meter type limits which tariffs you can switch to.
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4. Match tariff to profile
Below ~1,800 kWh: zero-standing-charge variant. 1,800–2,400 kWh: single-rate fix. Storage heaters: Economy 7 fix. SMETS2 + shiftable load: time-of-use.
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5. Run a whole-of-market comparison
Use the form on this page — it surfaces every option for your postcode.
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6. Apply and submit a meter read
Switching takes 5 working days. Submit an opening meter read on day one (both registers for Economy 7).
Common pitfalls to avoid
The most frequent issues we see when households and businesses act on what looks like a good deal.
- Picking a zero-standing-charge tariff above 2,200 kWh/year — the higher unit rate makes it more expensive.
- Switching a storage-heater flat off Economy 7 to single-rate — your overnight load will get billed at the higher day rate.
- Assuming all flats are low-use — all-electric flats can easily use 3,500–7,000 kWh/year and behave more like houses.
- Forgetting that the Ofgem zero-standing-charge mandate covers electricity only — gas standing charges are unchanged.
- Switching while a tenancy ends — confirm with your landlord whether the next tenant takes over the supply or you close the account.
Frequently asked questions
What's the cheapest electricity tariff for a UK flat in May 2026?
It depends on your annual kWh and meter type. Flats under ~1,800–2,200 kWh/year usually win with the new zero-standing-charge variant (mandated April 2026). Typical 2,000–2,400 kWh flats win with a 12-month single-rate fix at 2–6% below the April–June 2026 cap. Storage-heater flats win with Economy 7 on a 12-month fix.
Should I switch my flat to a no-standing-charge tariff?
Only if your annual electricity use is below roughly 1,800–2,200 kWh. Above that, the higher unit rate on the no-standing-charge variant outweighs the saved daily standing charge. Look at last year's kWh on a bill before switching.
Is Economy 7 still worth it for storage-heater flats?
Yes — for any flat where overnight kWh is more than ~30% of total use, Economy 7 beats single-rate. Storage heaters typically push 50–70% of total kWh into the night window. The May 2026 Economy 7 night rate is around 9–14p/kWh depending on region; the day rate sits near the cap unit rate.
Do all-electric flats use more electricity?
Yes — typically 3,500–7,000 kWh/year vs 1,800–2,400 kWh for a gas-heated flat. That pushes all-electric flats above the no-standing-charge break-even, so a fix or Economy 7 tariff is usually cheaper.
Can I switch supplier if my flat is rented?
Yes — as the named bill-payer you have the right to switch supplier, even in a rented flat, unless your tenancy agreement specifies otherwise. You don't need landlord permission for a supplier switch (you do for meter changes).
What's the standing charge on a flat's electricity?
It's a daily charge for being connected, capped by Ofgem and varying by network region. In May 2026 the daily standing charge sits in the high-50s/low-60s pence range depending on region. The new zero-standing-charge variant removes this in exchange for a higher per-kWh rate.
How do I know what meter my flat has?
Look at the meter. One reading = single-rate. Two readings labelled Day/Night (or Low/Normal) = Economy 7. A digital screen showing a logo and changing tariff information = SMETS2 smart meter, which can be programmed as single-rate, E7, time-of-use or tracker.
Are landlord-billed flats covered by these tariffs?
No — if your flat's electricity comes via a landlord sub-meter and the landlord bills you, you're a Heat Networks Act customer and your tariff is set by the landlord. The cheapest direct-supply tariffs in this guide apply only once your flat has its own supply contract.
Trust, methodology and sources
Page governance
- Written by
- EnergyPlus Editorial Team
- 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.
Editorial independence: our priority is clarity and like-for-like comparison. Where commercial relationships exist, options are still presented on suitability and the information available at the time.
Reputable UK sources we reference
- Ofgem — energy price cap and zero standing charge
- Ofgem — typical domestic consumption values
- Citizens Advice — switching energy supplier in a rented home
- GOV.UK — Heat Network regulations 2023
If you spot anything that looks out of date (a rule change, a new scheme), please contact EnergyPlus so we can review and update this page.
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