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• After deducting the service charge from you electricity bill, what remains is the energy charge.

• The present domestic tariff is very close to 12 cents per kilowatt-hour (kWh), the unit used to measure electrical energy consumption.

• For the previous example of the 100-watt lightglobe, it will cost 2.4 (kWh/day) x 0.12 (dollars/kWh) x 365 = $105.12 per year to run at 240 volts

• However at 254.4 volts it will cost 2.69 (kWh/day) x 0.12 (dollars/kWh) x 365 = $117.80 per year to run. The extra $12.68 revenue goes to the retailer purely due to the higher distribution voltage experienced by the customer.

• Obviously the running cost over any period of time is proportional to the total energy consumed.

• For this and very many other examples of domestic and office loads, the running cost of these appliances will be significantly influenced by the average supply voltage present in your premises.

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Appliances Affected by High Voltage