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Most energy bills have two parts: the unit rate you pay for each kWh used, and a fixed daily standing charge. Add VAT or sales tax on top.
Read your meter at the start and end of the period, or use the kWh shown on your bill, then compare tariffs with the yearly estimate.
| kWh used | 300 kWh |
| That kWh figure is for | The billing period |
| Unit rate per kWh | 0.26 |
| Standing / daily charge | 0.54 |
| Days in the period | 30 days |
| VAT / tax | 5% |
| Currency | £ |
| Bill for 30 days | £98.91 |
| Energy charge | £78.00 (300 kWh × £0.260) |
| Standing charge | £16.20 |
| Tax / VAT | £4.71 |
| Per year (same usage) | £1,203 |
| Average cost per kWh incl. standing charge | £0.330 |
£98.91.
| kWh used | 900 kWh |
| That kWh figure is for | The billing period |
| Unit rate per kWh | 0.17 |
| Standing / daily charge | 0.4 |
| Days in the period | 30 days |
| VAT / tax | 0% |
| Currency | $ |
| Bill for 30 days | $165.00 |
| Energy charge | $153.00 (900 kWh × $0.170) |
| Standing charge | $12.00 |
| Tax / VAT | $0.00 |
| Per year (same usage) | $2,008 |
| Average cost per kWh incl. standing charge | $0.183 |
$165.00.
kWh used × price per kWh, plus the daily standing charge × days, plus tax.
Around 225–300 kWh in a typical UK home and about 850–900 kWh in a US home.
A fixed daily fee for being connected, paid even if you use no energy.
Shift use to off-peak times on a time-of-use tariff, insulate, and switch off standby devices.