Home Energy
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Tariff & rates:
Band windows are typical for each tariff. Check your bill and use Custom if yours differ. Rates are optional and only used to estimate costs and savings.
Upcoming car charging slots
Scheduled by Octopus. Slots outside 23:30–05:30 make your whole home off-peak for those half-hours (up to 6 hours a day).
Tap a bar, then open it to drill down.
Hour by hour
Average kWh used in each half-hour across the days in view.
Day of week
Average kWh per day.
Heatmap
Each row is a day, each column a half-hour. Tap a row to open that day.Breakdown
Battery assumptions
The battery fills during the cheapest band and powers the house at all other times, using your real half-hourly data for the selected period. Twelve months gives the fairest picture of winter versus summer.
Usage moved to the cheap rate, by battery size
Share of your non-cheap-rate usage the battery could cover. The flattening shows where extra capacity stops paying off.
Daily usage outside the cheap window
Number of days at each level. A battery this size or larger covers that whole day.
Size comparison
Month by month
Per day = usage outside the cheap window.
Winter usually limits coverage. If you plan solar, summer coverage will rise further.
Is Octopus's data right?
Compares four views of the same meter for the period selected above: your bills, Octopus's half-hourly data, an independent copy of your meter's data from the DCC (via the free Bright app), and readings you take from the meter's own display.
Bills
Add a bill by hand
Octopus vs your meter, day by day
Octopus minus Bright, in kWh per day. Bars above the line mean Octopus recorded more than the DCC copy.
Meter readings
Take the total import reading shown on the meter's display (kWh for electricity; gas is usually m³ on smart meters). Two readings a week or more apart give a check that doesn't depend on any app. Your meter's manual says which button shows the total.
Settings
Smart gas meters record m³; bills show kWh. The factor is 1.02264 × calorific value ÷ 3.6 (about 11.2; your bill shows the exact calorific value). Applied automatically when Octopus's gas data looks like m³.