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|[[File:PowerUsagebyTimeofDay.png|center|600px]]
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| style="height:20px; width:600px; text-align:left;" |This [[graph]] shows a typical example of how [[power]] usage varies throughout the 24 hours of the day in the [[United Kingdom]]. The early hours of the morning show a low [[power]] usage because most people are not using much [[electricity]] while there is a peak in the evening at around 8:00pm while people cook food and [[heat]] their homes.
A minimum of 20,000MW are needed throughout the [[day]] which can be produced by any available '''energy resource'''. However, a variable amount of [[power]] (around 20,000MW) is also needed, which can only be generated by '''energy resources''' which can quickly vary their [[power]] output.
|[[File:UKEnergySupply2014.png|center|300px]]
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|colspan="2"|The [[percentage]] of the [[United Kingdom]]'s [[electricity]] generated by different '''energy resources''' in 1990 and 2014. There is a clear decrease in the use of [[Coal]] and [[Crude Oil]] and an increase in the use of [[Natural Gas]] and a number of [[Renewable Energy Resource]]s.
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The current trend suggests that the use of [[Renewable Energy Resource]]s will continue to increase in the future. However, since [[Wind Power]] is unreliable and cannot be altered to meet demand, there will likely be a need for [[Natural Gas]] to generate [[electricity]].