Particularly with the emergence of renewable power sources such as solar and wind, you’ll find the term “variability” widely used when people talk about balancing power supply with demand. Often it’s used to highlight the problems in integrating high proportions of such sources into an energy mix.
However it’s important to realise that variability is nothing new in power systems.
These systems are well used to coping with great variability: on the demand side.
This video lesson shows some example data to illustrate the different scales and time-frames over which power demand varies; from annual and seasonal to minute-by-minute.
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