The short version
General information, not advice
- Prices vary by time
- Requires smart meter
- Can reduce bills if usage is flexible
- Risk of higher bills if not managed carefully
See it step by step
One price, or many
Step 1 of 6
One price, or many
On a standard tariff every unit of electricity costs the same, whatever the time. A time-of-use tariff splits the day into rate bands: cheaper off-peak, dearer at peak demand.
Here the day runs left to right. The line shows the price per unit. The bars below add up what a home’s everyday use costs as the day goes by.
- Day on time of use (example)
- £2.18
- Same day, flat rate (example)
- £1.98
- Difference
- 20p more on time of use
Example: rates, band times and usage here are example figures. Every tariff sets its own.
Figures from the Switch4Good guide, Time-of-use tariffs explained, checked 4 October 2026: every rate, band, usage figure and appliance shown is an invented example, not a real tariff or home.
Time-of-Use (ToU) tariffs charge different electricity prices depending on the time of day.
Instead of a single flat unit rate, prices vary:
- Cheaper off-peak
- Higher during peak demand
These tariffs are enabled by smart meters and are designed to encourage flexible energy use.
This guide explains how ToU tariffs work, risks and rewards, and which households benefit most.
What Time-of-Use Pricing Really Means
Electricity demand varies throughout the day. Early evening is typically peak demand when many households cook, heat, and use appliances simultaneously.
Time-of-use (ToU) tariffs reflect this by charging:
- Higher rates during peak demand
- Lower rates during off-peak periods
Some ToU tariffs use fixed time bands (e.g. Economy 7). Others use dynamic half-hourly pricing.
Types of Time-of-Use Tariffs
Common examples:
Economy 7
- Cheaper overnight
- Higher daytime rate
EV tariffs
- Low overnight rates for vehicle charging
Dynamic tariffs
- Prices change daily or half-hourly based on wholesale markets
Each has different risk profiles.
Who Benefits Most
ToU tariffs benefit households that can shift usage.
Best suited for:
- EV owners charging overnight
- Solar + battery households
- Flexible working patterns
- Homes with programmable appliances
Less suited for:
- Households with high peak-time heating demand
- Those unable to shift consumption
Risks and Bill Volatility
If most of your usage remains during peak periods, bills may increase.
Dynamic tariffs introduce price volatility. On high-demand days, peak prices can spike.
Understanding your consumption pattern is essential before switching.
Technology Requirements
Most ToU tariffs require:
- Smart meter
- Half-hourly data consent
- Compatible billing systems
To maximise benefit, some households use:
- Smart EV chargers
- Smart battery management
- Timed appliances
Strategic Use and Behaviour Change
Time-of-use tariffs are not just pricing tools; they are behavioural incentives.
They encourage:
- Load shifting
- Grid balancing
- Lower carbon intensity usage (in some cases)
But they require active engagement. Passive households may not see savings.
Key takeaways
- ToU tariffs reward flexibility
- Smart meter required
- Savings depend on behaviour
- Not suitable for everyone
Common questions
Will I automatically save money on a ToU tariff?
No. Savings depend on shifting consumption to cheaper periods.
Is Economy 7 always cheaper?
Only if you use enough electricity overnight to offset higher daytime rates.
Are dynamic tariffs risky?
They can be. Prices can spike during high demand periods.
Do I need a smart meter?
Yes, for most ToU tariffs.
Can batteries make ToU tariffs more profitable?
Yes, by storing cheap electricity and using it at peak times.
Are ToU tariffs good for the environment?
They can reduce peak demand and support grid balancing, which may help integrate renewables.
Should vulnerable households use dynamic tariffs?
Caution is advised if consumption cannot be shifted or if bill predictability is important.
Switch energy
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