Cheapest electricity tariff UK: switch tonight

Get an up-to-date view of the cheapest electricity tariffs you can actually get in the UK tonight (based on your postcode, meter and payment method) — and switch with confidence.

  • Compare whole-of-market options for your home (not business energy)
  • See which tariff types tend to be cheapest for your situation (fixed, variable, EV, smart, Economy 7)
  • Switch online in minutes — your supply stays on throughout
Get your electricity quote How switching works tonight

Prices are personalised and change frequently. Your cheapest tariff depends on your region, meter type, payment method and usage. Estimates shown; terms vary.

Fast answer: what’s the cheapest electricity tariff in the UK tonight?

There isn’t one single “cheapest electricity tariff” for everyone in the UK — the cheapest tariff tonight depends on your postcode (region), meter type (standard, smart, Economy 7), payment method (monthly Direct Debit vs prepayment), and how much you use.

What we can do is help you quickly identify the cheapest shortlist you’re eligible for right now and guide you through switching safely.

Most common “cheapest” outcome

A competitively priced fixed tariff or tracker/variable tariff (if available) that matches your payment method and region.

If you have a smart meter

You may also qualify for time-of-use tariffs (e.g., cheaper overnight rates). These can be cheapest only if your usage fits.

If you’re on prepayment

Your choices can be narrower. The best value may come from moving to Direct Debit (where possible) rather than switching supplier alone.

Key takeaway: “Cheapest” is a combination of unit rate, standing charge, and how you use electricity. Always compare on estimated annual cost, and check exit fees and price-change rules before you switch.

Compare tonight’s cheapest eligible tariffs (postcode-based)

Fill in the basics and we’ll match you with electricity tariffs you can switch to. We’ll use your postcode to estimate local standing charges and available tariffs.

Good to know: Switching doesn’t interrupt your electricity supply. If you’re in a fixed deal, check any exit fee and whether it’s waived close to the end date.

What you’ll need (takes 2 minutes)

  • Your postcode (to identify your electricity region)
  • Approximate annual usage in kWh (from a bill) or your monthly spend
  • Your meter type (standard/smart/Economy 7) and payment method

Tonight switching checklist (quick)

1) Are you tied into a fixed deal?
If yes, check your end date and any exit fee on your bill or online account.
2) Do you have Economy 7 or a smart meter?
Your cheapest option may depend on your day/night split and whether you can shift usage.
3) Are you comparing the right thing?
Use estimated annual cost and review both unit rate and standing charge.

Get your personalised quote

We’ll send your results and next steps. Use details you check regularly so you don’t miss updates.

Used to identify your electricity region and available tariffs.

Optional, but can help if we need to clarify meter or tariff details.

No supply interruption. Estimates only.

Privacy note: We use your details to provide your quote and follow up about switching. You can ask us to stop at any time.

How switching works if you start tonight

In most cases you can start an electricity switch online at any time. The admin happens behind the scenes — your power stays on. The key is to keep your final meter reading and direct debit details accurate.

  1. Choose a tariff based on estimated annual cost. Confirm unit rate, standing charge, contract length, and exit fees.
  2. Apply with the new supplier. They contact your current supplier and manage the switch process.
  3. Cooling-off period. You usually have a short period to change your mind after you apply.
  4. Take meter readings around the switch date. This helps ensure your final bill and opening bill are accurate.
  5. Final bill and refund (if owed). Your old supplier issues a final bill; any credit should be returned.

Important: If you’re in debt to your current supplier or on certain prepayment arrangements, switching may be restricted. We’ll flag this when you compare.

Tariff types: which is usually cheapest (and when)?

Use this as a decision aid. The “cheapest tonight” for you depends on eligibility and how you use electricity. Always confirm the estimated annual cost for your postcode and usage.

Tariff type When it can be cheapest Watch-outs Best for
Fixed (e.g., 12–24 months) If market prices rise later, a good fix can protect your rate (subject to supplier terms). Exit fees; you may miss cheaper deals if prices fall. Budget certainty; households that prefer stability.
Variable / Standard variable tariff (SVT) Sometimes competitive short-term, especially if you want flexibility. Rates can change; you have less price certainty. People expecting to switch again soon; renters.
Tracker (price linked to an index) If the tracked index falls, your price can fall too (depending on tariff rules). Prices can rise quickly; check cap, update frequency, and exit fees. Risk-tolerant households monitoring energy costs.
Economy 7 (two rates) If a large share of usage is overnight (often with storage heaters). Day rate can be higher; night hours vary by region and meter set-up. Homes with storage heating or heavy night-time use.
Smart time-of-use (e.g., EV/overnight offers) If you can shift meaningful usage to cheap periods (EV charging, appliances). Peak rates may be high; requires smart meter; timing discipline matters. EV owners; tech-savvy households willing to load-shift.

Who “switch tonight” suits

  • You’re on an SVT and want to see whether a fix beats it for your postcode
  • Your fixed deal ends soon and you want to lock in (or plan) your next tariff
  • You’re moving home and want a competitive tariff ready
  • You can provide a realistic usage estimate (or have a recent bill)

Who it may not suit (or needs extra care)

  • You’re in significant supplier debt or have a complex prepayment set-up
  • You have Economy 7 but can’t shift usage overnight (day rate may outweigh benefits)
  • You’re considering a long fix but might move before the end (exit fees may apply)
  • You’re chasing “lowest unit rate” without checking standing charge and annual cost

Practical tip: If two tariffs are close, a lower standing charge often helps low users more, while a lower unit rate often helps high users more.

Costs, exclusions and common pitfalls (so you don’t pick the “wrong cheapest”)

The cheapest-looking electricity tariff can become expensive if it doesn’t match your usage or has conditions you’ll struggle to meet. Here are the big ones to check tonight.

Standing charge vs unit rate

A tariff can have a very low unit rate but a higher standing charge. Compare estimated annual cost using your usage, not headline rates.

Exit fees and moving home

Fixed tariffs often include exit fees. If you might move, check whether you can take the tariff with you or whether fees apply.

Economy 7 / time-of-use fit

These can be great if you use electricity at the right times. If your usage is mostly daytime, they may cost more despite a cheap night rate.

Payment method differences

Direct Debit tariffs often differ from prepayment. If you’re on a meter that can’t easily switch payment methods, eligibility may be limited.

Two realistic examples (with numbers)

These are illustrative to show how cheapest tariffs change by situation. Rates and availability vary by supplier, region and time. Numbers below are estimated and exclude any special discounts.

Scenario A: Low user in a flat (single-rate)

  • Usage assumption: 1,800 kWh/year
  • Tariff 1 (low unit, higher standing): 23p/kWh + 65p/day
  • Tariff 2 (higher unit, lower standing): 26p/kWh + 45p/day

Estimated annual cost:
Tariff 1: (1,800×£0.23)=£414 + (365×£0.65)=£237.25 → £651.25
Tariff 2: (1,800×£0.26)=£468 + (365×£0.45)=£164.25 → £632.25

Even with a higher unit rate, Tariff 2 is cheaper here because the standing charge is lower.

Scenario B: Higher user household (single-rate)

  • Usage assumption: 4,200 kWh/year
  • Tariff 1 (low unit, higher standing): 23p/kWh + 65p/day
  • Tariff 2 (higher unit, lower standing): 26p/kWh + 45p/day

Estimated annual cost:
Tariff 1: (4,200×£0.23)=£966 + £237.25 → £1,203.25
Tariff 2: (4,200×£0.26)=£1,092 + £164.25 → £1,256.25

For higher usage, Tariff 1 becomes cheaper because the lower unit rate outweighs the higher standing charge.

What this means for your switch tonight: if you don’t know your annual kWh, the “cheapest tariff” can be mis-identified. If you can, take your annual usage from your latest bill (or online account) before committing.

Quick exclusions to be aware of

  • Regional pricing: standing charges and unit rates can vary by region even on the same tariff name.
  • Meter compatibility: some tariffs require a smart meter (or won’t accept certain legacy meters).
  • Payment method: some deals are Direct Debit-only; prepayment options can differ.
  • Eligibility rules: “new customer only” deals or limited-time offers may appear/disappear quickly.

FAQs: cheapest electricity tariffs & switching tonight

Can I switch electricity supplier tonight?

You can usually start an application online at any time. The switch completes later, after industry processes and any cooling-off period. Your electricity stays on throughout.

How do I know which tariff is actually “cheapest” for me?

Compare on estimated annual cost using your annual kWh (or a realistic estimate). Check both unit rate and standing charge, plus any exit fees and tariff rules.

Does a smart meter get me cheaper electricity?

Not automatically. A smart meter can unlock time-of-use tariffs, which can be cheaper if you can shift usage (e.g., EV charging overnight). If you can’t, a standard tariff may be better value.

I’m on Economy 7 — should I switch to single rate?

It depends on how much you use at night. If most of your use is daytime, Economy 7 can be more expensive due to a higher day rate. If you have storage heaters or heavy overnight use, it may still suit you.

Will I pay an exit fee if I switch?

Some fixed tariffs have exit fees, while many variable tariffs don’t. Your bill, online account, or tariff information should tell you. Always check before switching, especially if your deal end date is close.

Is it safe to switch if my supplier goes bust?

If a supplier fails, Ofgem appoints a new supplier. You usually shouldn’t switch immediately until the process completes (so your account balance is handled correctly). Then you can compare again.

Can I switch if I rent?

Often yes, if you pay the electricity bill and you’re not on a landlord-supplied arrangement. If bills are included in rent or the landlord controls the supply, you may not be able to switch.

What if I don’t know my annual usage (kWh)?

Use your latest bill (often shown as annual consumption) or your online account. If you can’t, start with an estimate, but expect the “cheapest” ranking to change once accurate usage is entered.

Still unsure? Use the quote form above — we’ll shortlist tariffs by eligibility (postcode, meter, payment method) and highlight key conditions like exit fees.

Trust, transparency and how we assess “cheapest tonight”

Page details

Our approach (in plain English)

We focus on what changes the “cheapest” answer in the UK: region, meter type, payment method, usage, and tariff rules. We prioritise estimated annual cost rather than a single headline rate.

Limitations and caveats

  • Tariffs and prices can change daily (or faster) and may be withdrawn.
  • Not all households are eligible for all tariffs (e.g., smart/time-of-use).
  • Estimates depend on usage accuracy and standing charges in your region.

What we mean by “cheapest” on this page

When we say “cheapest”, we mean the tariff that is likely to produce the lowest estimated annual electricity cost for your inputs, taking into account:

  • Unit rate (pence per kWh)
  • Standing charge (pence per day)
  • Meter type (single-rate, Economy 7, smart/time-of-use)
  • Payment method (monthly Direct Debit vs prepayment)
  • Contract terms (exit fees, price variation rules)

Sources and further reading (UK)

We link to independent UK sources to support accuracy. Supplier offers and tariff names vary.

Ready to see the cheapest electricity tariff you can get tonight?

Compare by postcode, meter and payment method, with clear caveats on exit fees and tariff rules. No disruption to your supply.

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Updated on 25 May 2026