Cheapest Time to Use Electricity UK
Use live weather, Octopus Agile rates, and carbon data to plan cheaper appliance and EV charging times.
Setup Your Schedule
Enter your location and appliance preferences to get started
Appliance Schedules
Starter schedules are pre-loaded so you only need a postcode to run the planner. Edit any schedule below if needed.
Dishwasher
Current window: 10:30 - 21:30
Washing Machine
Current window: 11:30 - 23:30
EV Charging (Optional)
Enter your UK postcode above to enable the planner.
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How This Tool Works
This tool turns live weather, half-hour electricity prices, and carbon forecasts into a practical home energy schedule. It shows what to run, when to run it, and why those times are better.Read our full guide: Weather-Aware Energy Saving for Renters: Smart Strategies Under 30
- 1Enter your UK postcode. We validate it and map it to your local weather and Agile pricing region.
- 2Choose a 24, 48, or 72 hour window, then choose whether to optimize for lower cost or lower carbon.
- 3Add each appliance with the earliest start, latest end, and run duration. Add EV charging if needed.
- 4We fetch live Open-Meteo weather, Octopus Agile half-hour prices plus standing charge, and UK carbon intensity forecasts.
- 5The planner scores each possible slot and picks the best valid slot for each load inside your time limits.
- 6You review Key Insights, schedule cards, action windows, and metric explanations to decide what to run and when.
Complete Guide
Quick Tips
Jump-start your understanding with these essential tips
This period is often the most expensive on Agile tariffs. Moving flexible jobs like dishwashers, immersion heaters, and EV charging can cut daily cost without changing total usage.
The Action Windows table blends price, carbon, and weather into a simple score. Start with high-score windows for your biggest loads.
Cost mode prioritizes cheaper half-hour slots. Carbon mode prioritizes cleaner slots. You can switch mode to compare trade-offs before deciding.
Confidence is based on forecast coverage quality. High confidence means the timing signal is stronger. Lower confidence means keep more flexibility.
If standing charge is a big share of your total, timing still helps, but fixed daily charges limit total bill reduction.
Step-by-Step Guide
Follow these steps to get the most from this tool
Enter a valid UK postcode so the tool can fetch your pricing region and local weather coordinates.
Choose a 24, 48, or 72 hour horizon. Shorter horizons are usually more reliable for exact timings.
Select cost mode for lower bills or carbon mode for lower emissions.
Add each appliance with earliest start, latest end, and duration. The planner only picks times inside your limits.
For EV charging, set battery size, current charge, target charge, and charging window so the schedule is practical.
Each half-hour slot is scored using live Agile price, live carbon forecast, and live weather conditions.
The tool then picks the best valid slot for each appliance based on your selected mode.
Low-confidence signals get a small penalty to avoid over-promising savings.
Start with Key Insights for the plain-English summary.
Then review Optimized Schedule and Optimization Impact to see likely cost and carbon benefit.
Use the Action Windows table to choose backup times if your routine changes.
Re-run when weather changes, your plans change, or prices look unusual.
For most households, checking once per day or every other day is enough to stay close to best timing.
Advanced Topics
Deep dives for advanced users
Live inputs: We fetch half-hour price, carbon, and weather values for your selected horizon.
Slot scoring: Each half-hour slot gets a score based on your chosen mode (cost or carbon), plus weather context and confidence adjustments.
Schedule selection: For each appliance, we test valid start times inside your window and pick the best available slot.
Impact estimate: We compare your optimized plan with a worst-case timing baseline inside the same windows.
Open-Meteo: local hourly weather including temperature, humidity, wind, and rain.
Octopus Agile: half-hour import electricity prices and standing charge values.
UK Carbon Intensity API: national and regional carbon forecast values.
Seasonal benchmark data: long-term UK context used for seasonal comparison cards.
Total Cost and Total Carbon: estimated outcome of following your optimized plan.
Potential Savings and Carbon Avoided: estimated improvement versus worst timing inside your own windows.
Derived metrics: show how much timing opportunity exists today and why.
Action Windows: practical fallback slots if your first-choice schedule changes.
Forecast-based tools always carry uncertainty. The planner gives best estimates, not guarantees.
Regional carbon comparison is a best-fit mapping between tariff region and carbon reporting region.
Savings depend on following the suggested timings and on real-world appliance usage matching your setup.
Frequently Asked Questions
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