Demand Tariff, Charges Confusing

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I have just been changed to Demand tariff with AGL. 

I have tried to get detail on the demand is charge. 

They say they multiply the 30 min value of the highest demand in the month by 2, then this is multiplied by the days in the billing period.

We are are getting double charged !!!


On another discussion on this forum the moderator explain the calculation as :-


 The formula for calculating this charge is as follows: KW consumption x Days in billing period x Demand charge.

For example, if your highest 30 minutes of usage for a 90-day billing period was 9.6KW with a demand charge of 15c, this'd be calculated as follows: 9.6 x 90 x 15 = $129.60 (excl. GST).



AGL Message Line

Your demand is calculated by;

High-season Demand:

From 2 pm to 8 pm on working weekdays during 1 November to 31 March (inclusive) – the ‘summer months’.

From 5 pm to 9 pm on working weekdays during 1 June to 31 August (inclusive) – the ‘winter months’.

Low-season Demand:

From 2 pm to 8 pm on working weekdays during 1 April to 31 May and 1 September to 31 October (inclusive) – the non-summer and non-winter months.

To check this on your usage data, you'll need to filter your usage data to April only and then assort your usage values from highest to lowest. Locate the highest value within the 2pm - 8pm period.

This is then calculated by (Highest value x 2) to make up the full hour.