Minimum Demand is the lowest level of energy demanded from the grid at any point in time.
Low demand typically occurs during daylight hours in autumn and spring, on cloud-free sunny days, when temperatures are mild enough that large energy consuming devices such as heaters, air conditioners and pool pumps aren’t turned on and rooftop solar is generating the greatest amount of energy.
When these days fall on a weekend or public holiday, when offices and large industry are off and aren’t using power, there is a risk that demand levels can drop to extreme levels.
Under these conditions, AEMO who is responsible for whole electricity system instigates critical measures required to maintain to the security of the power system and stability of the electricity supply in the South West Interconnected System.
Check out AEMO Factsheet: Minimum Demand for more information.