Time of Use Tariffs Explained: How Peak and Off-Peak Pricing Could Save You Money
Time-of-use tariffs charge different electricity rates depending on when you use power, with off-peak hours (typically overnight) costing significantly less than peak periods.[1][2] Whether they save you money depends entirely on your ability to shift electricity consumption to cheaper windows - if you can't, a standard flat-rate tariff may be cheaper overall.
How Time-of-Use Tariffs Actually Work
Time-of-use (ToU) tariffs divide the day into distinct time bands, each with its own unit rate (pence per kilowatt-hour).[1] Unlike traditional Economy 7 or Economy 10 tariffs with fixed overnight discounts, modern smart ToU tariffs use more flexible pricing structures that can change daily or even half-hourly.[2]
The Basic Pricing Structure
- Off-peak rates (usually midnight to 7am): significantly discounted electricity - often 50-70% cheaper than standard rates
- Peak rates (typically early evening around 5-7pm): higher than standard rates, sometimes considerably
- Standing charge: a daily fixed fee, like standard tariffs[1]
Each supplier defines these windows differently. For example, Economy 7 traditionally provides seven cheaper night hours (approximately 11pm-7am), while modern smart tariffs like Octopus Agile offer half-hourly pricing that tracks wholesale market conditions.[2]
Smart Meter Requirement
You must have a smart meter to access most ToU tariffs.[2][7] Smart meters record half-hourly energy use, allowing suppliers to charge the correct rates and providing you with detailed consumption data.[7]
When Time-of-Use Tariffs Save You Money
A ToU tariff is cheaper when the money you save on off-peak units exceeds any extra you pay on peak units, plus any standing charge differences.[1] This calculation depends on three key factors:
Your Usage Pattern Makes the Difference
The percentage of electricity you consume during off-peak hours is critical. Research from Sunsave Energy (January 2026) illustrates the impact:
| Off-Peak Usage (12am-5am) | Annual Saving on 5,518 kWh |
|---|---|
| 25% | £287 |
| 50% | £574 |
| 75% | £860 |
| 100% (all usage off-peak) | £1,147 |
These savings are calculated against the current energy price cap of £1,758 per year for a typical household (January-March 2026).[8]
Your Appliances and Lifestyle
Households benefit most from ToU tariffs if they can automate high-energy appliances to run overnight:[2]
- Electric vehicle (EV) owners charging overnight
- Heat pump users running heating at off-peak times
- Homes with storage heaters, dishwashers, or washing machines set to delayed-start
- Immersion heater operation scheduled for cheap periods
- Battery storage systems charging during low-cost windows
If most of your consumption happens during peak hours (early evening, working hours), you may pay more overall despite the attractive off-peak rates.[1]
The Exact Off-Peak Windows
Different tariffs offer different time windows. Check whether the cheap hours match your routine.[1] For instance:
- Fixed overnight tariffs (e.g., most EV tariffs): five to six off-peak hours, typically 11pm-7am or midnight-5am[4]
- Dynamic tariffs (e.g., Octopus Agile): prices change half-hourly based on wholesale market conditions, rewarding flexible consumers but potentially punishing inflexible peak-time users[5]
- Solar/battery tariffs (e.g., Octopus Flux): designed for import/export optimization, with specific peak windows (e.g., 4-7pm) encouraging battery discharge when prices are high[5]
Different Types of Time-of-Use Tariffs Available
Fixed Off-Peak Whole-Home Tariffs
The most common model. You get a predictable low rate for a set block of hours (usually overnight), and this discount applies to your entire home, not just one appliance.[5] Examples include Octopus Go and So Energy's So Unique.[4]
Best for: Households with regular off-peak consumption patterns and basic automation (timer-controlled appliances).
Dynamic and Half-Hourly Pricing Tariffs
Octopus Agile is the leading example.[5] Prices vary throughout the day and are updated frequently (often half-hourly) based on wholesale market conditions. This offers maximum savings opportunity for engaged users.
Best for: Highly engaged consumers with smart chargers, home energy management systems, and batteries who can actively chase low-cost periods and avoid peak pricing.
Main risk: Price spikes at peak times can be severe. If you must charge your EV or use high-energy appliances at 6pm, dynamic tariffs can be punishing without automation.[5]
Solar and Battery Export Tariffs
Tariffs like Octopus Flux are explicitly designed for homes with solar PV and/or batteries. They use import/export time bands to encourage you to discharge batteries or export solar power during high-value peak windows (e.g., 4-7pm), rather than just minimizing imports.[5]
Economy 7 and Economy 10 (Traditional ToU)
Older fixed-rate ToU tariffs with two to three fixed pricing windows. E.ON Next offers both Economy 7 and Economy 10, plus newer tariffs like Next Drive (for EV owners) and Next Pumped (for heat pump owners).[7] These require less sophisticated meters than full smart tariffs.
What to Check Before Making the Switch
When comparing ToU tariffs to your current standard flat-rate tariff, assess:
Rates and Standing Charge[1]
- Peak unit rate (p/kWh)
- Off-peak unit rate (p/kWh)
- Any additional pricing bands
- Daily standing charge (compare to your current tariff)
Practical Fit[1]
- Do the off-peak hours align with when you actually use power?
- Are there exit fees or fixed-term commitments?
- Can your appliances be automated to run during cheap periods?
- How does the supplier present time-band usage in your bills?
Eligibility Requirements
To access most modern ToU tariffs, you need:
- A smart meter (nearly essential for half-hourly pricing)[2][7]
- Consent to share half-hourly data with your supplier[7]
- Existing supply with the relevant energy company (you typically switch to the ToU tariff after signing up for a standard tariff first)[4]
Calculating Your Potential Savings
Before switching, estimate how much of your annual consumption falls in off-peak windows:
- Review your recent energy bill or smart meter data
- Identify your typical usage times (e.g., EV charging 11pm-7am, daytime use, evening peak use)
- Calculate the percentage of annual kWh falling in each window
- Compare the cost using the supplier's rates: (off-peak kWh × off-peak rate) + (peak kWh × peak rate) + (standing charge × 365) versus your current flat rate plus standing charge
Use the Sunsave table above as a baseline: at 50% off-peak usage, savings are approximately £574 per year on average UK consumption.[4]
Who Should Consider a Time-of-Use Tariff?
Ideal candidates include:[2]
- EV owners charging overnight
- Heat pump users with flexible heating schedules
- Homes with solar panels and/or batteries
- Households with storage heaters
- Anyone able to automate high-energy appliances (washing machines, dishwashers) to run during off-peak hours
- Engaged consumers willing to monitor and adjust consumption patterns
Less suitable for:
- Households with inflexible daytime/evening consumption patterns
- Homes without smart meters or unwilling to upgrade
- Users unable or unwilling to automate appliance operation
- Premises where most electricity use occurs during peak hours
Current Market Context (February 2026)
The energy price cap for Q1 2026 (1 January - 31 March) is set at £1,758 per year for a typical dual-fuel household paying by Direct Debit.[8] ToU tariff savings are most attractive when the price cap is high, as the differential between off-peak and peak rates widens.
Many suppliers now offer some form of time of use tariff, particularly those targeting first time buyer energy supplier searches and households with specific needs like EV charging or heat pump operation. The market has evolved significantly beyond basic Economy 7 tariffs to include sophisticated smart options.
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Try Lodo FreeWhat exactly is a time of use tariff and how does it work?
A time of use tariff charges different electricity rates depending on time bands set by your supplier, such as overnight off-peak, daytime standard, and evening peak.[1] Your meter readings are allocated into these periods, each with its own unit rate (p/kWh), allowing you to save money by shifting usage to cheaper windows.[1]
How much money could I save by switching to a time of use tariff in 2026?
Savings depend heavily on your usage patterns.[3] For example, with 5,518 kWh annual consumption, households using 50% of electricity during off-peak hours (12am-5am) could save £574 annually compared to the January 2026 price cap rate of £1,528.[3] Savings can reach £1,147 per year if 100% of usage shifts to off-peak windows.[3]
When are peak and off-peak hours on time of use tariffs?
Peak and off-peak windows vary by supplier, but commonly include overnight off-peak (for example, midnight-7am) and peak evening hours (for example, 4pm-9pm).[1][6] Some tariffs offer multiple pricing periods throughout the day, with at least two off-peak periods and additional differentiation for specific needs.[3]
Is a time of use tariff cheaper than standard variable tariffs under the 2026 price cap?
Time of use tariffs can be significantly cheaper than standard variable tariffs if you can shift substantial usage to off-peak hours.[1] However, if your routine keeps you using electricity during peak windows, you could pay more overall, so comparison is essential.[1]
What appliances and usage patterns work best with time of use tariffs?
Electric vehicle charging, heat pump operation, and running high-energy appliances like dishwashers during off-peak hours are ideal for time of use tariffs.[3] TOU EV tariffs typically provide five or six off-peak hours per day, sufficient for vehicle charging and major appliance use.[3]
How do I calculate if a time of use tariff is worthwhile for my home?
Compare your estimated annual costs by entering your postcode and usage pattern into supplier calculators; identify your biggest shiftable loads and estimate what percentage of usage occurs during off-peak windows.[1] Installing a smart meter helps track your actual peak/off-peak consumption patterns.[1]
What risks should I consider before switching to a time of use tariff?
Time of use tariffs can be risky if rates are variable or if your routine changes - for example, if you start working from home and use more daytime electricity.[1] The key is understanding peak window costs and whether you can realistically keep large loads in off-peak periods.[1]
Are there different types of time of use tariffs available in 2026?
Yes, major types include Economy 7 and Economy 10 (fixed off-peak windows), EV-specific tariffs like Next Drive, heat pump tariffs like Next Pumped, and smart saver options with multiple pricing periods.[6] Some suppliers offer dynamic tariffs where prices fluctuate with real-time wholesale market rates.[7]
Can I switch away from a time of use tariff without penalty?
Standard tariffs, including many time of use options, do not tie you into contracts or charge exit fees, so you can switch whenever you like.[9] This flexibility allows you to test whether the tariff suits your lifestyle and change if it doesn't.
What should I know about standing charges with time of use tariffs?
Some time of use tariffs include a daily standing charge just like standard tariffs.[1] When comparing tariffs, ensure the standing charge difference doesn't offset savings from lower off-peak unit rates, and factor total annual costs including both standing charges and usage-based rates into your decision.[1]
Sources
- Are time-of-use energy tariffs cheaper UK 2026? - Energy Plus
- UK Time of Use Tariffs: Cut Your Energy Bill (2026) - Energy Stats
- Time-of-use tariffs: are they worth it? [UK, 2026] - Sunsave
- Time of use tariffs research data
- Smart tariff analysis
- Tariff comparison data
- E.ON Next tariff information
- Energy price cap data Q1 2026
- Tariff switching terms and conditions