Your tariff information can be found online or alternatively you can calculate your tariff from your most recent electricity bill.
To do this for a single rate tariff:
- Take the total cost of your first units of electricity.
- Add the cost of the remainder of your units.
- Then divide the total cost by the total of number units consumed.
For example, 200 units at £0.20 and 50 at £0.10 would work out as follows; (200 x £0.20) + (50 x £0.10) = £40 + £5 = £45. Then divide the total cost by the total units, which would be £45 ÷ 250 units = £0.18 per unit.
To do this for an economy 7 tariff:
- Calculate the total cost of your day rate units by taking the cost of your first units of electricity and adding the cost of the remaining units.
- Divide this total cost by the total day rate units, this provides your day rate tariff.
- Your night rate units are charged at one rate, which is shown on your bill. This is your night rate tariff.
- You should now have a day rate tariff and a night rate tariff.
For example, 200 day rate units at £0.20 and 50 at £0.10 would work out as follows; (200 x £0.20) + (50 x £0.10) = £40 + £5 = £45. Then divide the total day rate cost by the total number of units to provide your day rate tariff, which would be £45 ÷ 250 = £0.18 per unit. Your night rate tariff is shown on your bill (all night rate units are charged at this same rate).