Cheapest overnight electricity rate for UK homes (how to find it)
Overnight electricity can be cheaper if you’re on the right tariff and meter setup. Compare night-rate options (like Economy 7 and smart tariffs), see who they suit, and get a quote tailored to your postcode and usage.
- UK-specific: meter types, eligibility, regions, and common exclusions
- Two realistic cost scenarios with numbers (and the assumptions behind them)
- Transparent method: how we judge “cheapest” beyond headline unit rates
Rates and eligibility vary by supplier, region and meter. Figures on this page are examples, not guarantees.
Fast answer: what counts as the “cheapest overnight electricity rate” in the UK?
For most UK households, the cheapest overnight electricity comes from either:
A dedicated night-rate tariff (e.g., Economy 7)
You get a cheaper unit rate for a block of night hours, but the daytime unit rate is usually higher. Best if a sizeable share of your electricity can be shifted overnight (often 25–40%+), such as storage heaters or regular EV charging.
A smart time-of-use tariff
Prices can be cheaper overnight (and sometimes at other off-peak times), but rates may vary by day, season or half-hour. Best if you can flex usage and you’re comfortable with variable pricing rules.
Key point: “Cheapest” isn’t just the lowest night unit rate. You need to check day rate, standing charge, the exact off-peak hours, your meter type, and whether you can actually move enough usage overnight to benefit.
Quick takeaways (UK-focused)
- Off-peak hours vary by region, supplier, and meter configuration (they’re not the same everywhere).
- Economy 7/10 generally needs a compatible meter (often a multi-rate meter; some smart meters can support it, depending on configuration).
- EV owners and storage heating households are most likely to benefit, but only if charging/heating is genuinely scheduled overnight.
- Tenants can usually switch, but you may need landlord permission for certain meter changes (and there may be practical constraints in flats).
- Direct Debit is often cheapest compared with standard credit or prepayment, though availability varies.
Get a personalised overnight-rate quote (whole of market)
Tell us a few details and we’ll match you with tariffs that actually work with your meter setup and local network region, including off-peak options where available.
- Includes checks for standing charges, day/night unit rates, and payment method
- We’ll highlight tariffs suitable for EV charging, storage heaters, and high night usage
- No promises—just clear, comparable estimates and next steps
Before you start: If you can, grab a recent bill. Knowing whether you’re on a single-rate or two-rate meter (and your rough day vs night split) helps identify if an overnight tariff is genuinely cheaper.
Request your quote
How to find the cheapest overnight electricity rate (step-by-step)
- Work out if you can shift enough usage to overnight. If you can’t schedule big loads (EV charging, storage heating, immersion heater, dishwasher/washing machine), a night-rate tariff can cost more overall because day rates are often higher.
- Identify your meter type. Look for “Rate 1 / Rate 2” on your display or bill. Two-rate meters support day/night pricing. Smart meters may support time-of-use tariffs, but not every tariff works with every configuration.
- Check the actual off-peak window. “Night” isn’t universal. The times can vary (and may be split for some tariffs). Always confirm the exact hours for your meter/tariff before switching.
- Compare the whole cost, not just the night unit rate. Add standing charge + (day kWh × day rate) + (night kWh × night rate). A very low night rate can be offset by a high day rate or standing charge.
- Check for exit fees and contract length. Fixed deals may have exit fees if you switch away early. Variable deals typically don’t, but pricing can change.
- Consider practical constraints. If you rent, live in a flat, or have storage heaters, changing meter setup can be more complex. If your setup is already Economy 7, switching to single-rate isn’t always a win.
Tip: If you don’t know your day/night split, use a starting assumption (like 70% day / 30% night) and then check your bills or smart meter app later. Your decision can change if your real split is different.
Two realistic scenarios (with assumptions)
Scenario A: EV owner who can charge overnight
Assumptions (illustrative): 3,600 kWh/year total. Of that, 1,500 kWh is EV charging done overnight (scheduled). Day/night split becomes ~58% day / 42% night.
| Example tariff type | Estimated annual cost |
|---|---|
| Single-rate (30p/kWh + 55p/day) | ~£1,279 |
| Economy 7 (35p day / 14p night + 55p/day) | ~£1,032 |
Why it changes: the cheap night rate applies to a large, controllable load. Your actual rates/times will differ by supplier/region/meter.
Scenario B: Typical flat, little overnight usage
Assumptions (illustrative): 2,400 kWh/year total. Only 15% can be used overnight (no EV, no storage heating). Day/night split ~85% day / 15% night.
| Example tariff type | Estimated annual cost |
|---|---|
| Single-rate (30p/kWh + 55p/day) | ~£1,046 |
| Economy 7 (35p day / 14p night + 55p/day) | ~£1,148 |
Why it changes: with limited night usage, the higher day rate can outweigh the cheaper night rate.
Scenario maths (transparent): Annual cost = standing charge (55p × 365 = £200.75) + day kWh × day rate + night kWh × night rate. We use example rates to show how the decision works; your quotes will use live offers for your postcode and meter.
Compare overnight electricity options (what to choose)
If you’re deciding between a night-rate tariff and a standard single-rate deal, use this comparison to spot the trade-offs that most affect total cost.
| Option | Who it suits | Typical catch | What to check |
|---|---|---|---|
| Single-rate tariff | Most homes without large overnight loads | No cheaper overnight window | Standing charge, unit rate, exit fees |
| Economy 7 (two-rate) | EV charging, storage heaters, high overnight use | Day rate often higher; off-peak hours vary | Your % used at night; exact night hours; meter compatibility |
| Economy 10 (split off-peak) | Some storage heating setups needing longer off-peak | Not widely available; timings can be complex | Availability in your region; meter type; total cost vs E7 |
| Smart time-of-use (e.g., off-peak blocks / half-hourly) | Homes comfortable managing when they use power | Rules and prices may vary; may not be best for everyone | Need a working smart meter; peak pricing; how often rates change |
Decision checklist: likely to suit you if…
- You can reliably run a big load overnight (EV charge point schedule, immersion timer, storage heating).
- You expect at least ~25–40% of your usage to fall in off-peak hours (many EV/storage heating households exceed this).
- You know (or can confirm) your off-peak window and can stick to it.
- You’re comparing total annual cost (not just unit rates).
Probably not worth it if…
- Your home’s usage is mainly daytime/evening (working from home with electric cooking/heating, little automation).
- You’re on a two-rate tariff already but don’t have storage heating/EV charging anymore.
- You can’t control overnight use (no timers, noisy appliances at night, shared meters in some buildings).
- The tariff has a very high day rate or standing charge that wipes out night savings.
Costs, exclusions and common pitfalls (UK)
Off-peak hours aren’t universal
Economy 7 “night” times can differ by area and meter settings, and can shift with daylight-saving changes. Always confirm the off-peak window for your meter before relying on it.
Standing charges can dominate
A low night unit rate can be offset by a high standing charge—especially in low-usage homes. Compare total annual cost using your kWh, not just p/kWh.
Meter compatibility matters
Not every home can move to (or from) multi-rate tariffs instantly. Some changes may require supplier action, and in a few cases a meter exchange.
Exit fees & fixed terms
Some fixed tariffs include exit fees if you switch before the end date. Factor this in if you’re switching mainly for a cheaper overnight rate.
Payment method differences
Direct Debit is often priced lower than standard credit. Prepayment availability for complex time-of-use tariffs can be more limited (it depends on supplier and meter type).
“Cheap night rate” without the right habits
If you don’t actually move usage into the cheap window, you can end up paying more. The best overnight tariffs reward automation (timers/schedules), not good intentions.
Important: If you have storage heaters, changing from Economy 7/10 to a single-rate tariff can affect running costs and comfort. If you’re unsure, compare both options using your real day/night kWh split first.
FAQs
- What time is “overnight” electricity on Economy 7?
- There isn’t one UK-wide time. Economy 7 typically provides around 7 off-peak hours, but the exact window depends on your region, supplier and meter setup. Some meters may shift with daylight-saving. Always confirm the off-peak hours for your specific meter before relying on them.
- Is the cheapest overnight rate always an EV tariff?
- Not always. EV-focused tariffs can offer very low off-peak prices, but they may come with higher peak rates, specific charging-hour rules, or eligibility requirements (such as having a compatible smart meter). The “cheapest” option depends on your total usage pattern and the full tariff structure.
- Do I need a smart meter to get cheaper overnight electricity?
- For many modern time-of-use tariffs, yes—a working smart meter is often required. Traditional Economy 7 can work on older multi-rate meters too. If you’re unsure what you have, check your bill for separate day/night readings (Rate 1/Rate 2) or look at your meter display.
- Can I switch to Economy 7 if I’m currently on a single-rate tariff?
- Possibly, but it depends on your meter and supplier. Some homes may need a meter configuration change or a meter exchange to support two-rate billing. Availability can also vary by region. When comparing, check whether any meter work is required and whether it could affect timescales.
- I rent my home—can I still get a cheaper overnight rate?
- In many cases, yes. Tenants can usually choose their energy supplier, but changing meter setups or installing hardware may require permissions and may not be practical in some buildings. If you’re on a prepayment meter, the range of available time-of-use options may be more limited.
- How do I estimate whether a night-rate tariff will be cheaper for me?
- Use: annual cost = standing charge + (day kWh × day rate) + (night kWh × night rate). If you don’t know your split, start with a conservative estimate (e.g., 70% day / 30% night) and test how the result changes if night use is only 15% or as high as 45%.
- Will switching affect my electricity supply?
- No—switching supplier or tariff shouldn’t interrupt your electricity supply. The process is mostly administrative. Timings vary, and if a meter exchange or reconfiguration is needed, you may need an appointment.
- What’s the biggest mistake people make when chasing the cheapest night rate?
- Focusing on the night unit rate alone. A tariff can look brilliant overnight but be expensive overall due to a higher day rate, a higher standing charge, or because your real usage doesn’t land in the off-peak window.
Trust, methodology and sources
Page details
- Written by: EnergyPlus Editorial Team
- Reviewed by: Energy Specialist
- Last updated: May 2026
How we assess “cheapest overnight rate”
We focus on the outcome that matters to households: estimated total cost, not the lowest advertised night unit rate.
- Tariff structure: day rate, night rate, standing charge, and any peak/off-peak rules.
- Eligibility: meter requirements (single vs multi-rate vs smart), payment method constraints, and regional availability.
- Usage-fit: we consider whether a typical household can realistically shift usage into off-peak hours (EV charging, storage heating, timers).
- Switching friction: we flag where a meter change or configuration may be needed, as this can affect feasibility and timing.
Limitations: Tariffs change frequently and can differ by region and meter type. Example calculations on this page use illustrative rates to show the decision logic; your quote will use the offers available at the time for your postcode and meter eligibility.
Sources (UK)
- Ofgem (Great Britain energy regulator) — guidance on consumers, tariffs and switching
- Citizens Advice: Energy — practical help with bills, meters and switching
- GOV.UK — official UK government information (including energy and consumer topics)
Ready to check the cheapest overnight rate for your home?
We’ll compare UK tariffs for your postcode and highlight options that match your meter type and how you use electricity—so you can decide with confidence.
Remember: the cheapest overnight electricity rate is the one that produces the lowest overall cost for your usage pattern. If your night usage is low, a strong single-rate deal may be better.
Back to Energy Cost Saving Advice