Energy cost

How your weekly cost is worked out

The card adds up each day's cost over the last seven days, calculated from your device's recorded energy use (either from an energy meter or calculated from the device's power history) and the tariff rates you have entered. The headline figure is the week's total. Below the bars you can see the energy used in kWh and the average cost per day. Costs are shown in your account's currency.

Reading the bars

Each bar's height is that day's cost, with the amount above it. Today's bar is always last and highlighted. The most expensive completed day is shown in amber.

When the card shows no data or zero cost

If no readings have arrived this week, the card says there is no cost data. If every day shows zero cost despite the device running, the usual cause is a missing tariff: without rates, no cost can be calculated. Set up your tariff from the More menu and the card fills in as new readings arrive.

Frequently asked questions

Why does every day show zero cost?

Cost is energy use multiplied by your tariff rates (plus standing charge). If no tariff is set up, the cost comes out as zero even though energy was used. Add your tariff from the More menu.

Why is one bar a different colour?

The amber bar is the most expensive completed day this week. Today's bar is always shown in the highlight colour, even if it ends up the most expensive.

Is this my whole home's cost?

No. The card is an estimate that covers this device only, based on its own energy readings. Your energy bill and whole-home cost needs a smart meter connection, which is planned for a later release.