This graph shows the annual costs if usage remained constant at the level it was in 2006 (with the Carbon Tax component removed from 2012 to 2014). 2011 and 2012 are the obvious standouts, and it has stabilised since then.
The slight dips in 2013, 2015, and 2016 are primarily explained by dramatic drops in usage meaning that there's much less usage in the higher charging tiers, thus reducing the overall cost per kWh. This is specific to my household's usage pattern and shouldn't be considered representative of all electricity customers in South Australia.
Next let's break down how, in 10 years, both of the following statements are true:
- A 9.6% decrease in usage results in a 38.7% increase in price
- No increase in usage results in a 66.6% increase in price
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