Cheapest two rate electricity tariff in the UK (2026 guide)
Compare Economy 7 and other two‑rate tariffs the right way: off‑peak hours, unit rates, standing charges, meter compatibility and realistic savings for your home.
- See when two‑rate electricity is genuinely cheaper (and when it isn’t)
- Use our simple checks to estimate whether Economy 7 will reduce your bill
- Get a whole‑of‑market quote based on your postcode, meter and usage split
Estimates only. Prices and off‑peak times vary by region, supplier, meter type and payment method.
Cheapest two‑rate electricity tariff: what matters most
In the UK, the “cheapest” two‑rate tariff is the one with the lowest estimated annual cost for your exact day/night usage split—not simply the lowest off‑peak unit rate.
Quick rule of thumb: two‑rate tariffs (like Economy 7) tend to work best when you can shift roughly 35–45%+ of electricity use into off‑peak hours (commonly overnight), typically with storage heaters, an immersion heater or EV charging.
Key takeaways
- Off‑peak times vary by region, supplier and meter setup (and can differ with smart meters).
- The day rate is often higher than a single‑rate tariff—so low off‑peak use can cost more overall.
- Standing charges matter: a “good” unit rate can be offset by a higher daily standing charge.
- Two‑rate tariffs can suit homes with storage heating, EVs or flexible appliance use; they can be poor value for heavy daytime use.
What you need to compare accurately
- Your meter type
- Economy 7 / Economy 10, smart meter with multi‑rate setup, or single‑rate meter.
- Your off‑peak %
- Estimate how much usage you can move into off‑peak hours (EV charging, storage heating, hot water).
- Payment method
- Direct Debit, cash/cheque, or prepayment can change available tariffs and prices.
- Your region (postcode)
- Electricity distribution regions have different standing charges and unit rates.
Compare the cheapest two‑rate tariffs for your home
Prices depend on your postcode and meter setup. Share a few details and we’ll match you with suitable two‑rate and single‑rate options so you can see which is actually cheaper for your usage.
Tip: If you’re not sure of your off‑peak percentage, estimate it. We’ll show you what changes if your off‑peak use is higher or lower.
Two‑rate tariffs in plain English
A two‑rate tariff charges a higher day rate and a lower night (off‑peak) rate. The aim is to run energy‑hungry appliances (or EV charging) during off‑peak hours.
- Economy 7: typically 7 off‑peak hours overnight (times vary).
- Economy 10: typically 10 off‑peak hours split across day/night (less common).
- Smart multi‑rate: some suppliers can offer variable off‑peak windows.
Want to read first? Jump to how two‑rate tariffs work or our comparison table.
Get a whole‑of‑market quote
Fill in your details to compare suitable tariffs. We’ll use your postcode to apply regional pricing and check meter compatibility.
How two‑rate electricity tariffs work (Economy 7 and beyond)
Two‑rate tariffs split your electricity price into:
Day (peak) rate
Usually applies for most of the day. This rate is often higher than the unit rate on a comparable single‑rate tariff.
Night / off‑peak rate
Applies for a set number of hours (commonly overnight). This rate is lower to reward shifting usage into those hours.
Important: Off‑peak times are set by your meter configuration and supplier rules. For Economy 7 they’re commonly overnight, but exact windows vary by region and can shift with clocks (BST/GMT) depending on the meter.
What “cheapest” really means for two‑rate tariffs
To compare tariffs fairly, you need to estimate an annual cost using:
- Standing charge (p/day)
- Day unit rate (p/kWh)
- Night unit rate (p/kWh)
- Your annual electricity use (kWh) and how much falls into off‑peak hours
Scenario A: two‑rate can be cheaper
A flat with storage heaters and timed hot water, able to use a lot of electricity overnight.
| Annual use | 4,200 kWh |
| Off‑peak share | 45% (1,890 kWh) |
| Illustrative two‑rate prices | Day 32p, Night 14p, SC 55p/day |
| Estimated annual cost | £1,192 |
| Comparable single‑rate example | 26p, SC 55p/day ⇒ £1,245 |
Assumptions: example rates for illustration only. Standing charge held constant to isolate day/night impact. Real prices vary by region and supplier.
Scenario B: two‑rate can cost more
A household at home in the day with little overnight load and no EV.
| Annual use | 2,900 kWh |
| Off‑peak share | 15% (435 kWh) |
| Illustrative two‑rate prices | Day 33p, Night 14p, SC 55p/day |
| Estimated annual cost | £1,118 |
| Comparable single‑rate example | 26p, SC 55p/day ⇒ £936 |
Assumptions: example rates for illustration only. Real outcomes depend on your tariff options and how much you can shift off‑peak.
What to do next: if you don’t know your off‑peak percentage, start with 25%, 35% and 45% and compare outcomes. If you have a smart meter, your supplier may show day vs night usage in your account or app.
Two‑rate vs single‑rate: quick comparison (UK)
Use this table to decide whether it’s worth prioritising a two‑rate tariff in your comparison. Then use your quote results to confirm with real prices for your region and meter.
| What you’re comparing | Two‑rate (e.g., Economy 7) | Single‑rate (standard) | Best for… |
|---|---|---|---|
| Unit rates | Cheaper off‑peak, pricier day rate | One price all day | Two‑rate: flexible load / storage heat / EV |
| Off‑peak times | Fixed window(s), vary by meter/region; may shift with BST | Not applicable | People who can schedule usage to match |
| Meter compatibility | Needs Economy 7/10 or smart multi‑rate setup | Works with standard meters | Two‑rate: homes already on E7/E10 |
| Standing charge | Can be similar, but check carefully | Varies by region and tariff | Both: always include SC in comparisons |
| Risk of paying more | Higher if most usage is daytime | Lower complexity | Single‑rate: heavy daytime users |
Decision checklist: two‑rate suits you if…
- You have storage heaters and/or an immersion heater you can time overnight.
- You can consistently shift a meaningful share of usage off‑peak (often 35–45%+).
- You have an EV and can schedule charging within off‑peak hours.
- You’re comfortable checking (or being told) your off‑peak window and adjusting habits.
It may not suit you if…
- You’re at home most days with high daytime electricity use (cooking, heating, home working).
- Your property uses gas central heating and you don’t have big overnight loads.
- You can’t control when major loads run (no timers; landlord restrictions).
- You’re considering a tariff but don’t know your meter type and haven’t confirmed compatibility.
Practical next step: run a comparison with your current estimated usage. Then re‑run it with a higher off‑peak share (e.g., +10%) to see how sensitive your result is to behaviour changes.
Costs, exclusions and common pitfalls (UK‑specific)
Two‑rate tariffs are simple once set up correctly, but a few UK‑specific details can catch people out. These are the most common reasons a “cheap night rate” ends up costing more.
1) Your off‑peak hours aren’t what you think
Economy 7 windows vary and can be different from neighbours. Some meters don’t automatically adjust for BST/GMT, so the “cheap hours” can shift by an hour seasonally.
2) Day rate is higher than you budgeted
If most of your usage stays in the day, the higher peak price can outweigh the cheaper night price quickly.
3) Standing charges and payment method
Regional standing charges can be significant. Direct Debit vs prepayment can change both eligibility and the tariffs you’ll see.
Metering and switching caveats
- Meter type matters: if you’re on Economy 7/10, the tariff needs to match your meter configuration.
- Smart meters: some suppliers support multi‑rate on smart meters; others may offer only single‑rate depending on setup.
- Landlord / tenancy: you can usually choose your supplier if you pay the bill, but check your tenancy agreement for any practical restrictions.
Fees, eligibility and tariff features
- Exit fees: fixed deals can include exit fees if you leave early—always check the tariff summary.
- Price changes: variable tariffs can change; fixed deals lock unit rates for the term (standing charge may still change depending on terms).
- Economy 10 availability: fewer suppliers offer it, and it can be region‑dependent.
Best practice: before switching, confirm your off‑peak window and ensure your key loads (storage heaters, immersion, EV charger) are set to run during that window. If you’re unsure, ask your supplier or check your meter’s documentation.
FAQs: cheapest two‑rate electricity tariff (UK)
1) What is a two‑rate electricity tariff?
A tariff with two unit prices: a day (peak) rate and a night/off‑peak rate. Your electricity meter records usage separately for each rate.
2) Is Economy 7 always the cheapest option if the night rate is low?
No. The day rate can be higher than a standard tariff. If you don’t use enough electricity off‑peak, the overall annual cost can be higher—even with a very low night unit rate.
3) What are typical Economy 7 off‑peak hours?
They’re typically overnight for around 7 hours, but exact times vary by region and meter settings. Some meters may shift by an hour when clocks change (BST/GMT).
4) Can I get a two‑rate tariff with a smart meter?
Often yes, but it depends on whether the supplier supports a multi‑rate configuration for your meter and region. Some suppliers may only offer single‑rate on certain setups.
5) I’m on Economy 7 already—should I switch to single‑rate?
Possibly, but compare first. If your lifestyle has changed (e.g., no longer using storage heaters), a single‑rate tariff can be cheaper. Check your bills (or smart meter data) for your day/night split before deciding.
6) Does a two‑rate tariff affect my standing charge?
It can. Standing charges vary by region and tariff, and they can differ between two‑rate and single‑rate products. Always compare the total estimated annual cost, not unit rates alone.
7) Can I have Economy 7 if I have gas central heating?
Yes, but it’s not always good value. Without storage heating, hot‑water heating or EV charging to shift off‑peak, a two‑rate tariff may cost more due to the higher day rate.
8) Will switching affect my meter or require an engineer visit?
Often, switching tariff doesn’t require a visit if your meter already supports the rates. If you need a different meter configuration (e.g., moving from multi‑rate to single‑rate or vice versa), the supplier may need to reconfigure or replace the meter—this depends on the supplier and your current setup.
If you’re unsure what meter you have, your electricity bill often shows separate lines for day and night readings/charges. You can also check your meter display cycle for multiple registers.
Trust, methodology and sources
Page governance
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- February 2026
How we assess the “cheapest” two‑rate tariff
We define “cheapest” as the tariff with the lowest estimated annual cost for your household, based on the information you provide (postcode, meter type and usage assumptions). We focus on user outcomes, not headline unit rates.
- Regional pricing: we account for regional differences in electricity charges using your postcode (electricity distribution region impacts standing charge and unit rates).
- Tariff structure: we compare like‑for‑like across standing charge, day unit rate and night unit rate.
- Usage split: we estimate costs using your total annual kWh and off‑peak proportion (or a reasonable estimate you choose).
- Eligibility: results can depend on payment method (e.g., Direct Debit vs prepayment), meter compatibility and supplier availability.
Limitations: We can’t guarantee the exact off‑peak hours or acceptance until the supplier confirms your meter configuration. Prices can change, and some deals include exit fees or other terms that affect value.
Sources (UK)
- Ofgem (UK energy regulator) — guidance on energy bills, tariffs and switching protections.
- Citizens Advice: Energy — independent advice on tariffs, switching and problem‑solving.
- GOV.UK — consumer and household energy information (including smart meter guidance and support schemes where applicable).
We aim to keep this guide current, but supplier offers and tariff availability can change quickly. Always check the supplier’s tariff information and terms before you switch.
Ready to check the cheapest two‑rate tariff for your postcode?
Compare Economy 7 and standard tariffs side‑by‑side, using your meter type and estimated day/night usage. No misleading “headline rate” comparisons.
Switching eligibility depends on meter setup, supplier checks and tariff terms. Always review the tariff information before confirming.
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