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Load shifting moves electricity use from peak-rate hours to off-peak periods, when unit costs are lower. Most UK energy tariffs charge significantly more in the late afternoon and early evening than they do overnight or in the mid-morning. Running high-draw appliances such as dishwashers, washing machines, and EV chargers during cheaper windows can cut energy bills without reducing electricity use.
This guide shows how load shifting works in practice, which tariffs support it, and how to build a routine that delivers consistent savings.
Key takeaways
- Run appliances between 10 pm and 7 am to cut costs without reducing usage.
- Tumble dryers and washing machines deliver the biggest savings per cycle at off-peak rates.
- Load shifting only works on time-of-use tariffs such as Octopus Go or Economy 7.
- Smart plugs under £15 can automate scheduling, so you do not need to stay awake.
- Check that appliance cycle times fit fully within the off-peak window.
- Running multiple high-draw appliances at the same time can trip older consumer units.
- Standard variable tariffs charge the same rate all day, so shifting usage is pointless.
How load shifting lowers electricity costs without reducing usage
Run your highest-consuming appliances, such as dishwashers, washing machines, and tumble dryers, during off-peak hours, typically between 10pm and 7am. Energy suppliers charge less in these windows because grid demand drops overnight. The electricity itself is identical. Only the price per kilowatt-hour changes.
Time-of-use tariffs, such as Octopus Go and Economy 7, split the day into price bands. Off-peak rates can sit below 10p/kWh, while peak rates exceed 30p/kWh. At the cheaper rate, a single appliance cycle costs roughly a third of what the same cycle costs at 6pm.
Total consumption stays the same, so comfort and routine barely change. The saving comes entirely from when energy is drawn, not how much. Households on time-of-use tariffs that consistently run heavy loads overnight can reduce electricity bills by around 20% without buying new equipment or changing lifestyle habits. Most modern appliances include delay-start timers, so the switch is a one-time setup rather than a nightly task.
Which household appliances offer the biggest savings when moved off-peak
| Appliance | Typical draw in article | Load-shifting value |
|---|---|---|
| Tumble dryer | 2 kW to 3 kW | High per-cycle savings when moved overnight |
| Washing machine | 2 kW to 3 kW | One of the biggest savings opportunities |
| Dishwasher | 1.5 kW to 2 kW | Strong savings across a 90-minute programme |
| Immersion heater / storage heater | Not stated | Often already scheduled overnight on suitable tariffs |
| Phone or laptop charger | Low draw | Minimal benefit; savings are fractions of a penny |
Tumble dryers and washing machines deliver the largest per-cycle savings when you move them to off-peak hours. They draw between 2 kW and 3 kW for extended periods. A single tumble-dryer cycle at an off-peak rate instead of a daytime rate can halve the cost of that load. Dishwashers follow closely and typically draw 1.5 kW to 2 kW across a 90-minute programme.
Electric storage heaters and immersion heaters also benefit, although most time-of-use tariffs already schedule them overnight by default. Savings build faster when several appliances run in the same off-peak window instead of being spread across the day.
Devices with low draw rates offer minimal returns. Shifting a laptop charger or a phone charger saves fractions of a penny per session. The same applies to most items contributing to standby power consumption. Switch those off entirely rather than rescheduling their use. Focus load-shifting efforts on any appliance rated above 1 kW to see a meaningful difference on each bill.
How time-of-use tariffs determine when load shifting pays off
- Creates savings without reducing total electricity use
- Wider gaps between peak and off-peak rates increase the benefit of each shifted cycle
- Smart meters can help verify which hours are cheapest
- Works especially well when several heavy loads are moved into the same cheap window
- Saves nothing on a standard variable tariff with one flat unit rate
- Higher daytime prices can offset overnight savings
- Exact Economy 7 off-peak hours vary by meter and region
- Benefits depend on how much usage you genuinely shift, not just the tariff name
Standard variable tariffs charge the same rate per kilowatt-hour throughout the day. On these plans, running a dishwasher at 2 am saves nothing. Savings only start when your energy plan splits the day into distinct price bands.
Time-of-use tariffs set at least two price tiers across a 24-hour period. Octopus Go, for example, offers a four-hour super-off-peak window between 00:30 and 04:30. Economy 7 provides seven off-peak hours overnight, though the exact window varies by meter and region. A wider gap between peak and off-peak rates increases the saving from each shifted cycle.
Check your tariff’s rate schedule before you change any routines. Some plans balance cheap overnight rates with higher daytime prices. Costs can rise if you still use significant energy during peak hours. The net benefit depends on how much consumption you genuinely move into the cheaper window.
Smart meters paired with time-of-use plans show real-time pricing, so you can verify which hours carry the lowest rate. Review a full billing cycle after switching routines to confirm a measurable reduction.
Practical ways to automate load shifting with smart plugs, timers and EV chargers
A single smart plug with a built-in timer costs under £15 and removes the need to stay awake until midnight to start an appliance. Plug your washing machine or dishwasher into a TP-Link Tapo or Meross smart plug, set a schedule in the companion app, and the device will power on automatically during your tariff’s off-peak window.
For electric vehicles, dedicated chargers from myenergi (Zappi) and Ohme integrate directly with time-of-use tariffs. Both pull rate data and limit charging to the cheapest hours without manual input. Zappi also prioritises surplus solar generation before drawing from the grid.
Use mechanical segment timers for immersion heaters and storage heaters that lack Wi-Fi connectivity. Set the dial to cover your off-peak band, then leave it in place. The main mistake is letting appliances overlap. Three high-draw devices starting at the same minute can trip a fuse or exceed your supply limit. Stagger start times by at least 30 minutes so each appliance finishes its peak-draw phase before the next begins.
Common limits, risks and mistakes that reduce load shifting savings
Savings shrink when an off-peak window is shorter than the appliance cycle. A washing machine set to start at 04:00 on an Octopus Go tariff may still be running after 04:30, leaving the final spin charged at the standard rate. Check cycle times against your tariff’s cheap window before you schedule them.
Running too many appliances at the same time can trip the main fuse, especially on older consumer units rated at 60 A or 80 A. Stagger start times by 30 to 60 minutes so the total load stays within safe limits.
Noise also limits when appliances can run, particularly in terraced houses and flats. A spin cycle at midnight can breach council noise guidelines. Delayed-start dishwashers are usually quieter than washing machines, so they are better suited to late-night use.
Suppliers occasionally adjust off-peak hours or move customers onto revised rate structures. Review your tariff letter or app each quarter, then update smart plug schedules to match. If a schedule still follows an old off-peak window, appliances can run at peak rates for months before the higher bill becomes obvious.
Frequently Asked Questions
What is load shifting, and how does it reduce electricity bills?
Load shifting cuts electricity costs by moving energy-intensive tasks to off-peak hours, when rates are lowest. Running dishwashers, washing machines, and EV chargers during these cheaper periods reduces the cost per kilowatt-hour you pay. Over a billing cycle, this timing change alone can cut electricity costs by up to 20%.
Which household appliances are best suited to load shifting?
Appliances that use significant power and can run unattended offer the best savings potential. Dishwashers, washing machines, tumble dryers, and electric vehicle chargers are ideal candidates. Immersion heaters and storage radiators also shift well. Avoid shifting devices you need on demand, such as kettles or ovens, because they offer too little flexibility to deliver meaningful savings.
How much can load shifting save on a time-of-use electricity tariff?
Shift energy-intensive tasks like laundry, dishwashing, and EV charging to off-peak hours. This single change can reduce electricity costs by around 20% on a time-of-use tariff. Off-peak rates often sit at half the price of peak-hour rates, so using most electricity overnight or during midday windows delivers the largest savings.
Do smart meters or smart plugs make load shifting easier?
Shifting loads to off-peak hours is hard without real-time usage data. Smart meters remove that guesswork by showing live consumption and tariff rates. Smart plugs add automation, so appliances like dishwashers or tumble dryers can run during cheaper periods without manual intervention. Together, these tools make consistent load shifting far more practical.
When is the best time to run high-energy appliances to cut costs?
Off-peak electricity rates usually apply between 10 pm and 7 am, depending on your tariff. Use dishwashers, washing machines, and tumble dryers during these hours to cut per-cycle energy costs. Check your supplier’s rate schedule for the exact window, as time-of-use bands vary between providers.
