What is a single rate (single unit rate) electricity tariff?

A single rate tariff charges the same unit price (pence per kWh) for electricity at all times of day, plus a daily standing charge. It’s often simplest to understand and can suit households that use electricity fairly evenly across the day.

Who is a single rate tariff best for?

Single rate tariffs typically suit households that can’t reliably shift usage to cheaper off-peak hours (for example, many working-from-home households, families with daytime use, or anyone who uses appliances throughout the day). If most of your usage happens in peak hours, single rate can be better value than time-of-use options.

When might an Economy 7 or other time-of-use tariff be cheaper than single rate?

A time-of-use tariff (such as Economy 7) can be cheaper if you can shift a significant portion of your electricity use into off-peak hours—commonly overnight. This is often the case for homes with storage heaters, some EV charging routines, or households that can run high-consumption appliances off-peak.

How do I know if I should switch to a single rate tariff this month?

Compare your day vs night (off-peak) electricity usage, then estimate costs on both tariff types using your recent bills or smart meter data. If you’re not using enough electricity off-peak to offset the higher daytime rate on a time-of-use tariff, switching to single rate may reduce your bill and simplify budgeting.

What percentage of off-peak usage usually makes Economy 7 worthwhile?

As a rule of thumb, many households need roughly 30–40% (or more) of their electricity usage in off-peak hours for Economy 7-style tariffs to beat a comparable single rate—though the exact break-even point depends on the unit rates and your standing charge. Use your bill or half-hourly smart meter data for a precise comparison.

Will switching tariffs affect my smart meter or electricity supply?

Switching tariffs shouldn’t interrupt your supply. If you have a smart meter, it should continue to work normally. Your supplier may apply a new tariff configuration for single rate vs day/night readings, and you should see the updated rates on your account and future bills.

Are there exit fees for switching to a single rate tariff?

Exit fees depend on your current contract. Some fixed deals include an exit fee if you leave early, while many variable tariffs do not. Check your tariff terms before switching so you can factor any fees into your decision.

Can I switch to a single rate tariff if I currently have Economy 7?

Yes, in most cases you can switch from Economy 7 to a single rate tariff. Your meter readings may be handled differently (for example, combining day and night usage for billing), and in some situations a meter reconfiguration may be needed. Your supplier will confirm what’s required for your specific meter type.

Does a single rate tariff help with budgeting and bill stability?

Often, yes. With one unit rate for all usage, costs are easier to estimate and explain. This can be helpful if your routine varies month to month, or if you don’t want to manage when you run appliances.

How do I switch to a single rate tariff with Energy Plus?

You can explore your options and request a switch by visiting https://www.energyplus.co.uk/ and checking available tariffs for your postcode. If you’d like guidance on whether single rate is right for your usage this month, contact the team via the website for help comparing your current tariff to a single rate option.

Should I switch to a single-rate tariff in the UK this month?

A practical guide to deciding whether single-rate (flat) electricity beats Economy 7/Economy 10 or other multi-rate options — with UK examples, pitfalls, and a quick check you can do today.

Fast way to check if your night-use % makes a multi-rate tariff worthwhile
Two realistic scenarios with estimated numbers (and the assumptions behind them)
What to consider for smart meters, storage heaters, EV charging, and exit fees

Compare tariffs for my home See the quick decision check

Estimates only. Prices, eligibility and availability vary by region, meter type and payment method. Always confirm rates and any exit fees before switching.

Fast answer: when a single-rate tariff makes sense

If you’re on Economy 7/Economy 10 (or another multi-rate setup), switching to a single-rate electricity tariff can be the right move this month when your household doesn’t use enough electricity during the off-peak hours to benefit from the cheaper night rate.

A quick rule of thumb

Single-rate often suits you if less than ~30–35% of your electricity use is off-peak and you don’t rely on storage heating/hot water overnight.

If you regularly charge an EV overnight, use storage heaters, or can shift laundry/dishwasher to night hours, a multi-rate tariff may still win — but only if the day rate isn’t too high.

The 60-second check (no maths degree needed)

Look at your last bill/app and find day and night kWh (or “peak/off-peak”).
Estimate your off-peak share: night kWh ÷ total kWh.
If it’s below ~30%, shortlist a single-rate quote to compare.
Check for exit fees and whether your meter supports the tariff you want.

Key takeaways

Meter type matters: Economy 7 often needs a compatible meter (traditional multi-register or smart set up for it).
Standing charges can dominate: don’t compare unit rates alone.
“This month” can matter: if your usage pattern is seasonal (e.g., storage heating), your best option may change across the year.
Switching is usually straightforward with no disruption, but timings/reads can affect your first bill.

Important: If your home has storage heaters or an immersion heater wired to off-peak circuits, switching away from Economy 7/Economy 10 without checking your setup can increase costs or affect heating/hot water schedules.

Compare single-rate vs multi-rate for your home

The right answer depends on your meter, where you live, payment method, and when you use electricity. EnergyPlus compares across the market to help you see whether a single-rate tariff looks better for your pattern — then you can decide.

What you’ll need

Your postcode (to match regional charges)
Rough annual usage (or a recent bill)
Meter type (single-rate, Economy 7, smart)
Whether you pay by Direct Debit / prepay / receipt of bill

What we’ll show

Estimated monthly cost across suitable tariffs
Whether the tariff supports your meter setup
Key terms (standing charge, unit rate(s), exit fee)
Supplier and tariff features (where available)

If you’re unsure whether you’re on Economy 7, look for two electricity readings (often labelled “Day/Night” or “Rate 1/Rate 2”) on your bill or in-home display.

Get your tailored comparison

We’ll use your details to return quotes that match your home and meter type.

Single-rate vs Economy 7: what’s different (and what to check)

A single-rate tariff charges the same unit rate for electricity at all times. Economy 7 (and similar) uses two unit rates: a cheaper off-peak rate for a set number of hours (often overnight) and a higher daytime rate. Exact hours and prices vary by supplier, tariff and region.

Feature	Single-rate	Economy 7 / multi-rate	What it means for you
Unit rate(s)	1 price per kWh	2+ prices per kWh (day/night)	Multi-rate can be cheaper if you use a meaningful share off-peak.
Off-peak hours	Not applicable	Set times (vary by area/meter)	If your off-peak times don’t match your routines, benefits can vanish.
Standing charge	Daily charge (varies)	Daily charge (varies)	Compare the full bill estimate — standing charge can outweigh unit-rate tweaks.
Best for	Most typical day-evening usage	Storage heating, planned night usage, some EV schedules	If you can’t shift usage, single-rate is often simpler and safer.
Meter compatibility	Works with most meters	Needs multi-register or smart configured for it	You may need a meter configuration change before switching tariff types.

Decision checklist: switching to single-rate suits you if…

Your off-peak share is low (often under ~30–35%).
You don’t have storage heaters, or you don’t rely on them heavily.
Your household is home in the day/evening (so daytime rate matters most).
You want simpler billing (one unit rate) and less timing risk.
You’re moving home soon and prefer fewer surprises on first bills.

It may not suit you if…

You heat your home with storage heaters and charge them overnight.
You regularly run an EV charger overnight and can keep most charging off-peak.
Your smart tariff gives you very cheap off-peak periods and you can reliably shift usage.
You have a complex meter setup (e.g., related heating circuits) and haven’t confirmed how it will behave on single-rate.

Two realistic scenarios (with estimated numbers)

These examples show how the decision works. They are illustrative only — actual rates vary by supplier, region, payment method and meter.

Scenario A: Flat user on Economy 7 (low night use)

Home & usage: 1–2 bed flat, electric cooking, no storage heaters. Annual electricity: 2,900 kWh. Off-peak share: 20% (580 kWh night, 2,320 kWh day).
Assumed rates (illustrative): Economy 7: day 30p, night 15p, standing charge 60p/day. Single-rate: 25p, standing charge 60p/day.
Estimated annual electricity cost: Economy 7: (2,320×£0.30)+(580×£0.15)+£219 ˜ £1,002
Single-rate: (2,900×£0.25)+£219 ˜ £944
Difference: single-rate ˜ £58/year cheaper (estimate)

Why: the higher Economy 7 day rate hits most of the usage. With only 20% off-peak, the night discount doesn’t compensate.

Scenario B: Storage heating (high night use)

Home & usage: 2–3 bed, storage heaters + immersion on timer. Annual electricity: 7,000 kWh. Off-peak share: 55% (3,850 kWh night, 3,150 kWh day).
Assumed rates (illustrative): Economy 7: day 32p, night 14p, standing charge 60p/day. Single-rate: 26p, standing charge 60p/day.
Estimated annual electricity cost: Economy 7: (3,150×£0.32)+(3,850×£0.14)+£219 ˜ £1,767
Single-rate: (7,000×£0.26)+£219 ˜ £2,039
Difference: Economy 7 ˜ £272/year cheaper (estimate)

Why: more than half the electricity lands in the cheaper window, so the multi-rate discount outweighs the higher day rate.

Break-even idea: there’s a tipping point where Economy 7 becomes better. It depends on the gap between your day vs night rates and what single-rate you can get. If you want, use the form above and we’ll compare based on tariffs available for your postcode and meter type.

Costs, exclusions and common pitfalls (UK)

Before you switch to a single-rate tariff this month, these are the issues most likely to trip people up — especially with Economy 7 setups and smart meters.

1) Exit fees and end dates

Some fixed tariffs charge an exit fee if you leave before the end date. Variable tariffs typically don’t, but check your terms.

Tip: If your fix ends soon, compare what you’d pay by waiting versus switching now — especially if an exit fee applies.

2) Meter and wiring limitations

Economy 7 homes may have separate circuits for heating/hot water that only energise off-peak. Moving to single-rate can be fine, but confirm how your system is set up so you don’t lose intended control or timers.

3) Smart meter tariffs vs “two-rate” tariffs

Some suppliers offer smart tariffs with multiple price windows. These aren’t always comparable to classic Economy 7. If you switch, ensure your new tariff is compatible with your smart meter configuration and that you understand the pricing windows.

4) Standing charges and payment method

Standing charges vary by region and tariff. Your payment method (Direct Debit vs prepayment) can change which tariffs you can access and the overall rates you’re offered.

5) Estimated reads and first-bill surprises

Switches are typically handled without supply interruption, but opening/closing readings matter. If you have a two-rate meter, make sure both registers are captured accurately.

6) Seasonal pattern changes

If you use electric heating more in colder months, your night-use percentage may rise. What looks like the best tariff this month may differ later — consider a plan that matches your year-round pattern.

Not sure what you’re on? If your bill shows two unit rates for electricity, you’re likely on a multi-rate tariff (often Economy 7). If you only see one unit rate and one reading, you’re usually on single-rate.

FAQs

Is a single-rate tariff cheaper than Economy 7 in the UK?

Sometimes. It depends mainly on your off-peak usage share and the gap between Economy 7’s day and night rates versus the best single-rate available for your postcode and payment method. If most of your usage is in the day/evening, Economy 7’s higher day rate can make it more expensive overall.

What percentage of night use makes Economy 7 worth it?

There isn’t a universal number, but many households need roughly 30–40%+ of electricity usage at night for Economy 7 to compete, and more if the day rate is particularly high. Use your bill’s day/night kWh to estimate your split, then compare quotes using your actual meter type.

Can I switch from Economy 7 to single-rate without changing my meter?

Often yes, but not always. Some meters can remain in place while billing is set to a single rate, while other setups (especially where heating/hot water is wired to off-peak) may need configuration changes. Your supplier can confirm what’s possible for your specific meter and wiring.

Will switching affect my electricity supply?

In most UK cases, switching supplier or tariff is an administrative change and you won’t lose power. The main risk is billing accuracy if opening/closing readings aren’t correct — particularly with two-rate meters.

I have a smart meter — does Economy 7 still apply?

Yes, smart meters can support single-rate and multi-rate tariffs, but the tariff type must be set up correctly. Some suppliers also offer smart time-of-use tariffs with different price windows that aren’t the same as traditional Economy 7.

Does a single-rate tariff work for EV charging?

It can, but EV owners often benefit from tariffs with cheaper off-peak windows if most charging can reliably happen overnight. If your charging is mixed (daytime top-ups, variable schedules), a good single-rate tariff may be simpler and more predictable.

Will my standing charge change if I switch?

It can. Standing charges vary by tariff and region, and they’re a key reason “cheaper unit rate” doesn’t always mean a cheaper bill. Always compare the estimated total cost, not just p/kWh.

I’m on prepay — can I switch to single-rate?

Potentially, yes, but your tariff options may be more limited and rates can differ from Direct Debit tariffs. You’ll also need to ensure the new supplier supports your meter type (including smart prepay where applicable).

Trust, methodology and sources

Editorial standards

Written by:: EnergyPlus Editorial Team
Reviewed by:: Energy Specialist
Last updated:: April 2026

How we assess whether single-rate could be better

We base the guidance on how UK electricity tariffs are structured and what typically drives costs:

Usage split: the share of electricity used at off-peak times (from your day/night kWh where available).
Rate spread: how much higher the day rate is compared with the night rate on multi-rate tariffs, versus single-rate alternatives.
Standing charge impact: daily standing charges can materially change totals.
Eligibility constraints: meter type (single vs multi-register vs smart), payment method (Direct Debit vs prepay), and regional differences.
Practical fit: heating/hot water setup, EV charging behaviour, and how reliably usage can be shifted.

Assumptions and limitations (please read)

The scenario numbers are illustrative and use rounded rates to show the mechanism of comparison.
Actual tariffs can vary by region, supplier, payment method, and meter configuration.
Economy 7 off-peak hours can differ by location and meter settings; always confirm your off-peak window with your supplier.
We don’t promise savings. Switching suitability is personal to your household’s usage and constraints.

Sources (UK)

Ofgem (UK energy regulator) — guidance on switching and consumer protections.
Citizens Advice: Energy — practical consumer advice on bills, meters, and switching.
GOV.UK — government information and related support signposting.

Ready to check single-rate prices for your postcode?

We’ll show options that fit your meter type and usage pattern — so you can decide with confidence (no hype, just comparisons).

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Updated on 9 Apr 2026