What is demand?


We have been asked this question by a number of people (with references to several articles we have published on WattClarity®), as there are a number of different ways of reporting “demand”.

Depending on the source of the data (i.e. which software package we used), it could be any of the following:

NEM-Watch (for a real-time view)

NEM-Watch provides a real-time view of the National Electricity Market.

As such, it updates two different data sets from AEMO/NEMMCO:

1)  Dispatch Data is the 5-minute data AEMO uses to dispatch the market. 

(a)  This data is produced in the NEMDE dispatch engine at the beginning of each (5-min) dispatch interval and applies as the end of the dispatch interval.

(b)  The measure of demand is called the Dispatch Demand Target.

(c)  Hence it is a forecast (at the beginning of the dispatch interval) what the demand will be at the end (hence the name “Target”).

(d)  NEMMCO/AEMO calls it “TOTALDEMAND”.  Because of the small time-scale involved, it tends to be reasonably accurate, but is not the same as a metered demand.

2)  Trading Data is the 30-minute data AEMO uses for commercial transactions in the market. 

(a)  The Trading Demand Target is just the simple (i.e. time-weighted) average of 6 x 5-minute Dispatch Demand Target numbers in the trading interval.

(b)  Hence, this figure (too) is not a metered demand


NEM-Review (for historical analysis)

As trading (30-min) data is what is used for all commercial transactions in the market, the NEM-Review package provides updates of just this data set.

Hence, the demand numbers shown in NEM-Review at Trading Demand Target.


NEMforecast (for forward-looking data)

Data published in the PASA process by AEMO is for a given half-hour (or, in the case of MT PASA, for the highest demand half-hour in the day), hence it is the equivalent of Trading Demand Target.


About the Author

Paul McArdle
One of three founders of Global-Roam back in 2000, Paul has been CEO of the company since that time. As an author on WattClarity, Paul's focus has been to help make the electricity market more understandable.

1 Comment on "What is demand?"

  1. Further clarification about demand is now available in the AEMO resource here:
    http://www.aemo.com.au/en/Electricity/Market-and-Power-Systems/Dispatch/Regional-Demand-Definition

    It appears that the “Metered Demand” figure we update in NEM-Review falls under the “Scheduled Demand” classification in the AEMO document.

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