Overlaying the annual kWh electricity usage over the previous graph shows a fairly obvious disparity between the rate that the electricity usage changes and the rate that the electricity costs change.
To be fair, from 2007 to 2010 it looks consistent but overall it culminates in the usage in 2015 being 500 kWh lower than it was in 2006 whilst costing $430 more.
For 2015 and 2016 I've stacked the solar rebate value on top of the overall electricity bill to keep the graph consistent (cost for supply and usage). The results for 2016 make it obvious that a full year of solar panel usage, LED lighting, and smarter energy behaviour creates a big difference in annual cost. Keep in mind, however, the initial outlay of $6,000 for solar panel installation.
Next up is a look at what the annual costs would be if the household usage remained at the 2006 level.
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