Site Prices Update
Last Updated28th June 2022
All calculations on this site are based on current fuel prices, they are checked regularly and calculations are automatically updated.
The costs calculated based on these fuel prices should be regarded as 'good estimates', given that fuel prices vary in different parts of the county and at different time of the year.
The calculations also have different levels of accuracy depending on the nature of the calculation. For example calculating the energy use of a known power output TV is very easy compared to calculating the effect on energy savings when insulating a cavity wall.
Site Calculations
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User PricesFor several of the fuel prices on this site you can now set your own prices and all the calculations on the site will adjust accordingly.
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At Confused About Energy we aim to provide practical, impartial advice on all aspects of energy usage, climate change and ways to save money on energy bills.
All calculations on this site are based on current fuel prices they are checked regularly are automatically updated and were last changed on:-
28th June 2022
The costs calculated based on these fuel prices should be regarded as 'good estimates', given that fuel prices vary in different parts of the county and at different time of the year.
The calculations also have different levels of accuracy depending on the nature of the calculation. For example calculating the energy use of a known power output TV is very easy compared to calculating the effect on energy savings when insulating a cavity wall.
Site Calculations
| Electricity | £0.271 per unit (1 kWh) |
| Economy Electricity | £0.094 per unit (1 kWh) |
| Gas | £0.072 per unit (1 kWh) |
| Domestic LPG | £0.122 per unit (1 kWh) |
| Heating Oil | £0.104 per unit (1 kWh) |
| UK Grid CO2 Emissions | 0.233 kg per kWh used |
The main units used in this site are in the table below, For a complete explanation of power and energy Read More.
| Unit | Name | Detail |
|---|---|---|
| W | Watt | Unit of Power |
| kW | Kilowatt | 1000 watts |
| kWh | Kilowatt hour | Measure of Energy |
| L | Litre | Measure of Volume |
Please use twitter to ask a question Message @@EnergyThinking
How much does it cost to have a light on for 1 hour?
Well it depend on the light.
The old filament (or incandescent) bulbs are relatively expensive at £0.027 for an hour and the LED comes in at £0.004 . The table below also shows halogen and compact fluorescent bulbs. All bulbs are 100W equivalents giving 1600 lumins (we also give the the CO2 Emissions in the next column), this means they give out about the same light as the old 100w filament bulb, the one you used to burn your hand on because they waste so much energy as heat.
For carbon dioxide data have a look here:- Carbon dioxide emission from burning fuels and the electricity grid
| Type | Power | How much does it cost to run a light bulb for 1 hour? | How much Carbon Dioxide (CO2) is emitted by using this electricity? |
|---|---|---|---|
| Incandescent | 100W | £0.027 | 0.02kg |
| Halogen | 70W | £0.019 | 0.02kg |
| Compact fluorescent | 20W | £0.005 | 0kg |
| LED | 15W | £0.004 | 0kg |
Just to give you an idea of the running costs of light bulbs for a year have a look at the table below, and I'm sure you can see that a move to LED is worth while.
| Type | Power | 6 hours | 12 hours | 18 hours | 24 hours |
|---|---|---|---|---|---|
| Incandescent | 100W | £59.39 (51.1kg) |
£118.779 (102.1kg) |
£178.169 (153.2kg) |
£237.559 (204.2kg) |
| Halogen | 70W | £41.571 (35.7kg) |
£83.146 (71.5kg) |
£124.72 (107.2kg) |
£166.291 (143kg) |
| Compact fluorescent | 20W | £11.878 (10.2kg) |
£23.756 (20.4kg) |
£35.634 (30.6kg) |
£47.512 (40.8kg) |
| LED | 15W | £8.908 (7.7kg) |
£17.818 (15.3kg) |
£26.726 (23kg) |
£35.634 (30.6kg) |
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