Dishwasher Timing on Octopus Agile: Save £70 a Year

The dishwasher timing saving: how much and why

A standard dishwasher cycle uses 1.5kWh. On Octopus Agile, electricity prices swing between roughly 4p/kWh overnight and 38p/kWh or more during evening peak hours. That swing is the opportunity.

Run your dishwasher at 8pm on a weekday and you are likely paying around 38p/kWh. That cycle costs 57p. Run the same cycle at midnight when overnight rates settle near 4p/kWh and the same cycle costs 6p. That is a 51p saving per cycle.

Do it every single day and the annual saving is:

• Peak cost: 1.5kWh x £0.38 x 365 = £208/year
• Overnight cost: 1.5kWh x £0.04 x 365 = £22/year
• Saving: £186/year if you currently run at peak every night

Most people do not run their dishwasher at peak Agile prices every single night. A realistic saving, accounting for mixed timing and the July 2026 price cap baseline of 26.11p, sits between £65 and £80 per year. That is a night out. A month of Netflix. A full tank of petrol. From pressing one button.

The peak-to-overnight price ratio on Agile is 8 to 20 times depending on grid demand. On plunge pricing events (around 5 to 10 per month), prices can fall to -20p/kWh. On those nights, running the dishwasher overnight literally earns you money back. Check AgileAlert's live dashboard to spot these events before they happen.

The numbers at a glance

The bottom row is not a gimmick. It happens multiple times a month. You can target those windows directly using the live price tracker.

How to set delay start on Bosch, AEG, Miele, Samsung, Hotpoint

Every major dishwasher brand sold in the UK includes a delay start function. The mechanism varies by brand and model, but the principle is the same: you set the number of hours until the cycle should start, or the time you want the cycle to finish.

Bosch

Press the programme selector to choose your wash. Then press the clock or delay button repeatedly to scroll through the delay options (usually 1 to 24 hours). Confirm by pressing Start. The display shows a countdown. Some Bosch models use a "Time Delay" button; others use a dedicated clock symbol. Check the display for an hourglass or clock icon once set.

For a detailed step-by-step with all model variants, read the brand-by-brand delay start guide.

AEG and Electrolux

Select your programme. Press and hold the Delay Start button (labelled with a clock icon on most models). Use the plus and minus buttons to set the delay in hours. Press Start to confirm. The machine will not start immediately; it waits the set duration then begins the wash.

Miele

Miele uses a rotary selector. Turn the dial to your chosen programme. Press Start/Stop once to confirm. Then turn the selector to the delay option and set the finish time. Miele models typically ask for a finish time rather than a start delay, so work backwards from your target end time.

Samsung

Touchpad models have a Delay button or Delay Start option in the settings menu. Press it once to enter the delay mode, then use the arrow buttons to increase the delay in one-hour increments. Press Start to confirm and begin the countdown.

Hotpoint and Indesit

These models often combine the delay and programme selector on the same dial. Turn the programme dial to your chosen wash. Hold the Delay button and use the selector to increase the delay from 1 to 9 or 1 to 19 hours depending on model. Release and press Start.

If your specific model is not listed here, read the complete brand guide covering Beko, Candy, and older models.

Eco mode: does it save money and do dishes still come out clean?

Eco mode reduces the wash temperature (typically 45-50 degrees Celsius instead of 65 degrees) and extends the cycle time to compensate. The trade-off is real: eco mode uses roughly 1.1kWh versus the standard 1.5kWh, a saving of about 27%.

At price cap rates, the annual saving from switching to eco mode for daily use is around £15 per year. Combine eco mode with overnight Agile timing and the annual bill drops to £16 versus £22 at standard settings overnight. The combined effect of timing and eco mode together is the biggest saving available.

Do dishes come out clean? At full loads with modern enzyme-based tablets, yes. Eco mode performs best when the dishwasher is full and dishes are not heavily encrusted. For lightly soiled loads, eco mode is fine. For heavy casserole dishes or baked-on stains, a standard cycle is more reliable.

The key insight for Agile users: eco mode adds 30 to 60 minutes to the cycle. At 8pm that extra time is inconvenient. At midnight, nobody cares. Read the full eco mode guide for the complete breakdown.

Dishwasher vs hand washing: the real cost comparison

The common assumption is that hand washing is cheaper than using a dishwasher. The data says otherwise.

A full dishwasher load uses 9 to 12 litres of water per cycle. Washing the same dishes by hand typically requires 40 to 60 litres if you run a full hot tap. The dishwasher uses less water in almost every scenario, and often less energy too, because heating 12 litres to 65 degrees takes less energy than continuously running a hot tap for 15 to 20 minutes.

On Octopus Agile overnight pricing, a full dishwasher load at 4p/kWh costs 6p. The equivalent hand wash, using a full hot water cylinder heated at price cap rates, costs more than 20p in energy alone before factoring in water bills.

For the full cost comparison including water, energy, time, and detergent, read Dishwasher vs washing by hand: which costs less?

Full load only: why this matters even more on Agile

Running a half-empty dishwasher uses the same 1.5kWh as a full load. The energy cost per plate, per cup, per piece of cutlery doubles when the machine is half empty. On a standard tariff this is wasteful. On Agile, where overnight slots are limited and you want to make the most of cheap windows, it matters even more.

The rule is simple: never run it unless it is full. If you live alone and it takes two days to fill the machine, let it sit. The delay costs nothing. The energy saving from running full loads versus half loads is between 25% and 50% per item washed.

If odours are a concern, run a rinse-and-hold cycle (available on most brands) which uses minimal water and keeps the interior fresh without starting a full wash cycle.

The tablet and detergent cost: often overlooked

Dishwasher tablets typically cost 15p to 30p each. For a daily dishwasher user, that is £55 to £110 per year in tablets alone. This dwarfs the energy cost of overnight running, which lands at £22/year.

Switching to a cheaper own-brand tablet at 12p each saves £10 to £20 per year with no perceptible difference in cleaning quality on modern machines. Use one tablet per full load, not two.

Salt and rinse aid add roughly £10 to £15 per year. Keep these topped up. Running without salt damages the water softener in the machine and leads to expensive repairs.

Using AgileAlert to target tonight's cheapest window

Agile prices are published by Octopus Energy at around 4pm each day for the following 24 hours. The overnight window from midnight to 6am is almost always the cheapest period. But within that window there is often a specific 2 to 3 hour slot where prices are lowest.

On some nights, prices dip below 2p/kWh. On plunge pricing nights they go negative. These events are visible in advance if you check the half-hourly data. A standard dishwasher cycle takes 60 to 90 minutes. Setting delay start to hit a 3am price trough of 1p/kWh instead of a 1am price of 8p/kWh saves only a few pence, but adds up over months.

The practical workflow:

1. Check AgileAlert's live price dashboard at around 5pm or 6pm to see tomorrow's overnight prices.
2. Identify the lowest 2-hour window (typically 2am to 5am).
3. Set delay start to hit the midpoint of that window.
4. Stack the dishwasher, press delay start, and go to bed.

This takes 90 seconds once you know the prices. Over a full year the discipline of hitting true overnight troughs rather than just "sometime after midnight" adds another £5 to £15 to the total saving.

On plunge pricing nights, the dishwasher is essentially free. The live dashboard shows when plunge events are forecast so you can catch them without guessing.

Which dishwashers are the most efficient?

The EU energy label rates dishwashers from A (most efficient) to G (least efficient). From January 2025, the rating scale was reset and the majority of models now sit in the D to F range, with only the most efficient models reaching A or B.

Energy use per cycle varies from around 0.7kWh for top-rated models to 1.8kWh for older or larger machines. If your dishwasher is more than 10 years old, it almost certainly uses more energy per cycle than a new A-rated model. The annual saving from switching to a modern efficient dishwasher can offset the purchase price within 3 to 5 years when combined with overnight Agile timing.

Key brands with strong efficiency records for 2026 models: Bosch Series 6 and above, AEG 7000 series, Miele G5000 series. These machines include auto-sensing programmes that adjust water temperature and cycle length based on the actual load, reducing energy use further.

Putting it all together: the full annual saving

Here is what the numbers look like when you stack all the savings:

The headline "save £70 a year" in this guide's title is the conservative, realistic figure for someone switching from mixed timing on a standard-rate tariff to consistent overnight Agile running. The upside is higher if you have been running at peak evening rates.

Frequently asked questions