Cheapest two‑rate electricity tariffs for UK homes (2026 guide)
Two‑rate tariffs (like Economy 7) can be cheaper for some households—but only when your meter type and off‑peak usage pattern fit. This guide explains how to spot the best value and avoid expensive mismatches.
- See when a two‑rate tariff can cut costs (and when it usually won’t)
- Compare key features: day/night rates, standing charges, exit fees, eligibility
- Use our checklist and examples to estimate whether you’d benefit
Estimates only. Prices vary by region, meter type, payment method and supplier eligibility. Always check the tariff information label before switching.
Fast answer: what’s the cheapest two‑rate electricity tariff?
There isn’t one universal “cheapest” two‑rate tariff for all UK homes. The best value depends on your region, meter type (Economy 7 / Economy 10 / smart meter with multiple registers), payment method and—most importantly—how much electricity you use overnight vs daytime.
Key takeaway #1
Two‑rate tariffs tend to work best when at least ~35–45% of your electricity is used in the cheaper off‑peak window (typical for storage heaters, immersion heaters and EV charging).
Key takeaway #2
If most of your usage is daytime (WFH, electric cooking, tumble dryer, gaming/TV), a two‑rate tariff can be more expensive because the day rate is often higher than a standard single‑rate tariff.
Key takeaway #3
“Economy 7 times” aren’t the same everywhere and may vary by meter setup. Always confirm your exact off‑peak hours before switching.
Quick self‑check: If you have storage heaters or can reliably schedule EV/immersion/dishwasher/washing machine overnight, a two‑rate quote is worth doing. If not, start by comparing single‑rate tariffs.
Compare two‑rate tariffs in minutes
Tell us the basics and we’ll match you with available two‑rate and single‑rate options from across the market. We’ll show estimated costs and key terms so you can decide with confidence.
What you’ll need: your postcode, email and (ideally) a recent bill showing whether you have Economy 7/E10 or a smart meter with multiple registers.
Before you start: what counts as “two‑rate”?
- Economy 7
- Two unit rates: a cheaper night rate for ~7 hours and a higher day rate. Common in flats and all‑electric homes with storage heaters.
- Economy 10 (and other multi‑rate set‑ups)
- More off‑peak hours split across day/night in some regions. Availability is more limited and switching can be trickier.
- Smart time‑of‑use (TOU)
- Rates may change by time/day (sometimes more than two rates). Not all TOU products are suitable if you need a fixed overnight window.
Get your two‑rate quote
We’ll email your results. If you want help finalising a switch, add a phone number (optional).
Tip: If your home is all‑electric and you have storage heaters, tell the agent/supplier you need to keep a two‑rate set‑up. Some switches can accidentally move you to single‑rate if the meter configuration isn’t checked.
How to find the cheapest two‑rate tariff for your home
The “cheapest” option is the tariff with the lowest estimated annual cost for your usage pattern—after standing charges and any fees. Use the steps below to narrow it down quickly.
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Confirm you actually have (or can get) a two‑rate meter setup.
Look for two readings on your bill (often labelled Day/Night, Rate 1/Rate 2). If you’re unsure, your supplier can confirm. Some smart meters support multi‑rate configurations, but not all tariffs will use them.
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Estimate your off‑peak share.
If you can’t see day/night kWh on a bill, approximate: EV charging overnight, storage heaters, and an immersion heater can quickly push you above 35–45% off‑peak. Without these, many households sit below ~20–30% off‑peak.
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Check the off‑peak hours for your meter.
Economy 7 hours vary. Some are fixed; others shift slightly due to GMT/BST or regional set‑ups. If you rely on overnight heating/charging, confirm your window before switching.
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Compare the full cost, not just the night rate.
A very low night rate can be offset by a high day rate or standing charge. Always compare estimated annual cost using your usage split.
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Review the “small print” that affects switching.
Look out for: fixed term length, exit fees, whether the tariff is only for direct debit, and whether your meter needs reconfiguration.
Scenario A (often suits two‑rate): EV + smart charging
Assumptions (illustrative):
- Annual electricity use: 3,600 kWh
- Off‑peak share: 45% (1,620 kWh) via EV charging and appliances
- Example two‑rate prices: day 30p/kWh, night 15p/kWh, standing charge 55p/day
- Example single‑rate price: 26p/kWh, standing charge 55p/day
Estimated annual unit cost:
Two‑rate: (1,980×£0.30) + (1,620×£0.15) = £837
Single‑rate: 3,600×£0.26 = £936
Standing charges are the same in this illustration, so they cancel out. Your actual prices and standing charges vary by region and supplier.
Scenario B (often doesn’t suit two‑rate): daytime‑heavy usage
Assumptions (illustrative):
- Annual electricity use: 2,900 kWh
- Off‑peak share: 20% (580 kWh)
- Same example prices as above
Estimated annual unit cost:
Two‑rate: (2,320×£0.30) + (580×£0.15) = £783
Single‑rate: 2,900×£0.26 = £754
Here, the higher day rate outweighs the cheaper night rate. This is common if you can’t shift usage to off‑peak hours.
Rule of thumb (not a guarantee): if your night rate is about half your day rate, many households need roughly 40%+ of usage off‑peak to beat a competitive single‑rate deal. Use a quote to confirm for your region and tariff terms.
Two‑rate vs single‑rate: what to compare (and why it matters)
Use this table as your quick decision aid. It focuses on the factors that most commonly decide whether a two‑rate tariff is genuinely “cheapest” for a given home.
| What to compare | Two‑rate tariff (Economy 7 style) | Single‑rate tariff | Why it matters |
|---|---|---|---|
| Unit rates | Day rate + night rate | One rate all day | The day rate can be higher—so daytime use is more expensive. |
| Standing charge | Can be similar or higher | Varies by supplier/region | A slightly higher standing charge can wipe out night‑rate savings. |
| Off‑peak window | Fixed hours set by meter configuration | Not applicable | If you can’t use power during off‑peak hours, it’s unlikely to be cheapest. |
| Eligibility | May require Economy 7/E10 or compatible smart setup | Usually available to most homes | Some suppliers won’t support certain multi‑rate setups (especially Economy 10). |
| Exit fees / fixed term | Common on fixed deals | Common on fixed deals | If your usage changes, you may want flexibility to switch again. |
| Payment method | Often cheapest on direct debit | Direct debit often cheapest | Your available tariff set and rates can change with payment method. |
Cheapest two‑rate tariff checklist (quick)
- Meter: You have Economy 7/E10 or a confirmed multi‑rate smart set‑up
- Usage shift: You can move high‑load use (EV, immersion, storage heating) into off‑peak
- Off‑peak hours: You know your exact off‑peak window and it fits your routine
- Day rate: You’ve checked the day rate isn’t punishingly high for daytime use
- Standing charge: You’ve compared it across options (not just the unit rates)
- Fees: You’ve checked exit fees and fixed term length
Who two‑rate often suits
- All‑electric properties with storage heaters
- EV owners who can charge overnight (or schedule at off‑peak)
- Homes with immersion heaters on timers
- Households comfortable using delay timers for appliances
Who it often doesn’t
- Low electricity users with little overnight consumption
- Homes where most energy use is daytime (WFH, electric cooking)
- People who can’t reliably schedule usage into off‑peak hours
- Some Economy 10 setups (limited supplier support)
Costs, exclusions and common pitfalls (UK‑specific)
Two‑rate tariffs can be excellent value for the right home, but the most expensive outcomes tend to come from a handful of avoidable issues.
1) Off‑peak times don’t match your life
Economy 7 “night” hours aren’t always the same nationally, and can be affected by meter programming and seasonal time changes. If your EV charger or immersion timer runs outside the off‑peak window, you may pay the higher day rate.
What to do: Ask your supplier for your exact off‑peak hours (in writing if possible) and test your timers after switching.
2) The day rate is higher than you expect
Many two‑rate deals “pay for” the cheaper night rate with a higher day rate. If you don’t shift enough usage, the deal can cost more overall than a strong single‑rate option.
What to do: Compare estimated annual cost using a realistic night‑usage percentage (not best‑case).
3) Metering and readings cause billing confusion
Two registers (or more) mean more opportunities for misreadings or swapped day/night readings—especially during a supplier switch or if your bill labels are unclear.
What to do: Take dated photos of your meter readings on switch day and keep them until your first correct bill arrives.
4) Economy 10 and niche multi‑rate tariffs can be harder to switch
Some suppliers may not support Economy 10 (or may treat it differently). This can limit “whole of market” availability compared with standard Economy 7.
What to do: If you’re on Economy 10, confirm supplier support before applying, and ask whether your meter needs reconfiguration.
5) Direct debit vs other payment methods
Some tariffs are only available (or priced best) on monthly direct debit. If you prefer other payment methods, the “cheapest” shortlist can change.
What to do: Filter comparisons by the payment method you’ll actually use.
6) Exit fees and term lengths
If your circumstances change (EV sold, heating upgraded, someone starts working from home), a previously good two‑rate deal may stop being best value—but fixed tariffs may charge exit fees.
What to do: Balance headline cost against flexibility. “Cheapest today” isn’t always “best for the year ahead”.
Important: If you rely on storage heaters, don’t switch to a single‑rate tariff by accident. Ask the new supplier to confirm in writing that your meter/tariff will continue to bill separate day and night readings (where required).
FAQs: cheapest two‑rate electricity tariffs (UK)
Is Economy 7 always cheaper at night?
The night unit rate is usually cheaper than the day rate on Economy 7, but the tariff can still be more expensive overall if your day usage is high or the standing charge is higher. Always compare estimated annual cost using your day/night split.
How do I know if I have a two‑rate meter?
Check your bill: you’ll typically see two electricity readings (often “Day” and “Night” or “Rate 1” and “Rate 2”). Your meter may show two registers when you press the display button. If you’re unsure, your supplier can confirm your meter configuration.
What are the Economy 7 off‑peak hours?
It depends on your meter’s settings and sometimes your region. Many setups provide about 7 hours overnight, but the exact start/end times can vary. Ask your supplier for your off‑peak window and re-check after any meter work or switch.
Can I get a two‑rate tariff with a smart meter?
Often yes, but it depends on the supplier and how your smart meter is configured (single‑register vs multi‑register). Some time‑of‑use tariffs use half-hourly pricing rather than a fixed “day/night” split, which may or may not suit your needs.
If I switch supplier, will I lose my Economy 7 setup?
You shouldn’t, but mistakes can happen if meter details aren’t handled correctly. Before switching, ask the new supplier to confirm they support your Economy 7/E10 configuration and that you’ll be billed on two rates. Keep photos of your meter readings on switch day.
Do two‑rate tariffs work with solar panels?
They can, but it’s case‑by‑case. If solar covers a lot of your daytime use, your remaining imported electricity may skew more towards evening/night—potentially making off‑peak pricing more relevant. However, you still need to check standing charges and day-rate exposure during low-solar months.
Is Economy 10 better than Economy 7?
Not automatically. Economy 10 can provide more off‑peak hours (sometimes split across the day), which can suit certain heating systems. But tariff choice and supplier support can be more limited. Compare quotes and confirm the off‑peak times match your heating controls.
What if I rent—can I still switch to a two‑rate tariff?
If you pay the energy bills, you can usually switch supplier. However, changing meter configuration (or installing a new meter) may require landlord permission, and you should check any tenancy conditions. If you already have a two‑rate meter, switching tariffs is typically straightforward.
Trust, methodology and sources
Page accountability
- Written by
- EnergyPlus Editorial Team
- Reviewed by
- Energy Specialist
- Last updated
- April 2026
How we assess “cheapest” two‑rate tariffs
We focus on what UK households can actually act on: estimated annual cost using day/night unit rates, standing charges, and relevant eligibility constraints. We also highlight terms that commonly change the outcome (exit fees, payment method requirements, meter compatibility).
- Regional pricing: Electricity rates vary across distribution regions; your postcode materially affects results.
- Usage split sensitivity: The same tariff can be “cheapest” or “expensive” depending on your off‑peak share.
- Meter eligibility: Economy 7/E10 and multi‑register smart configurations can limit available tariffs.
- Total cost view: Standing charges and fees are included in comparisons where tariff details are available.
Limitations: This guide provides editorial guidance and illustrative examples, not personalised financial advice. Live tariff availability and pricing change frequently. Always check the supplier’s tariff information label and your meter setup before agreeing a switch.
Ready to check the cheapest two‑rate tariff for your postcode?
Compare day/night rates, standing charges and key terms in one place—so you can switch only if it genuinely suits your home.
No guaranteed savings. Quotes depend on your meter type, payment method, usage split and tariff availability.
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