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Energy Saving Lighting Electricity Cost Calculator

Simply changing your bulbs to energy savers could have a dramatic effect on your electricity bills over a year. Our comparison chart below compares the running cost of a conventional bulb to an energy saver. Multiply this by the number of lights in your home and work and you can see how it adds up! And you don’t have the chore of changing bulbs so often.

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Comparison of standard and energy saving light bulbs:

Supplier & tariff:  Or: 

Electricity costs calculated at UK Average Tariff of 14.29p per unit.

Bulb Type Power Cost/day* Cost/Year Saving
Standard 40W 3.43p £12.52
Energy Saving 8W 0.69p £2.50 80.0%
Standard 60W 5.14p £18.78
Energy Saving 11W 0.94p £3.44 81.7%
Standard 75W 6.43p £23.47
Energy Saving 15W 1.29p £4.69 80.0%
Standard 100W 8.57p £31.30
Energy Saving 18W 1.54p £5.63 82.0%

*based on 6 hrs a day at the Average rate of 14.29p/kWh (2011 tariff) for a unit of electricity.
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Enter your own tariff details

Refer to your electricity bill or your energy suppliers published tariffs (usually found on their website) to obtain the information required below.

Do you pay a Standing Charge?  
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First Unit Price per KWh
Usually the higher priced unit of electricity up to a given breakpoint. 		  pence/unit
Second Unit Price per KWh
The amount you pay per unit of electricity after the breakpoint.		   pence/unit
Breakpoint
The number of units of electricity at which the price switches to the Second Unit Price per KWh.		   units