£800? £1200? What could you be saving?
This household is on a flat-rate tariff of 25.61p per kWh, meaning every unit costs the same, day or night.
Based on the supplier’s electricity estimate of 6,670 kWh per year, that equates to around £1,708.
If that electricity were instead purchased overnight at 6.7p per kWh and stored in our battery system, the cost would fall to approximately £447 — a saving of about £1,261 in the first year alone.
Although, recent usage shows 649 kWh - Multiplied across 12 months, that level of consumption would cost around £1,995.
On a time-of-use tariff — using 6.7p as an example — the same electricity would cost just £522, a saving of about £1,473.
Same electricity. Very different annual cost.
Even this savvy off-peak user could save even more
This household is already doing extremely well, with 68% of their usage already shifted to the cheaper night rate of 6.38p.
But the remaining 300.7 kWh used during the day was charged at a rate 4 times higher than that of the night time! (26.26p)
So, could they save even more? Yes. Certainly.
By filling a battery overnight with those cheaper 6.38p units, and avoiding the daytime rate entirely this household would have saved £62.80 in this month alone (including VAT).
No small print. No tricks.
The figures shown assume 100% of your electricity usage is supplied from energy stored in the battery — we’d rather be clear than clever.
The 6.7p per kWh example is based on a current off-peak rate under E.ON NextDrive Fixed v7. We’re not affiliated with E.ON, and we don’t steer people toward any particular supplier. Every household is different, and the right tariff is your choice.
Why not grab your latest bill and have a quick look at your own annual usage? The maths is simple — and it’s your numbers that matter most. Or use the savings calculator below.
If you’d like a second pair of eyes, just drop us a line. We’re always happy to help.
Let's look at another...
This household is currently on an EDF prepayment tariff at 23.59p per kWh, with estimated usage of 3,795 kWh per year (just over 10 kWh a day).
If they switched to a time-of-use tariff and charged a 15 kWh battery overnight using cheaper off-peak electricity (for example around 6.5p per kWh), that stored energy could then be used during the day instead of paying the higher daytime rate.
On that basis, the estimated annual saving would be around £648.
Actual savings will vary depending on tariff prices, household usage, and how the system is used.
