The quarterly pattern in the data is that it is always lowest in the March quarter. It then steadily increased in the June quarter with the highest amount used in the September quarter. It then steadily falls for the December quarter. The March quarter is the lowest quarter it is on average 580 GWH below the normal amount of electricity used. This is because the March quarter also includes January and February months and they are the hottest months in New Zealand. This means that people maybe using their BBQ’s instead of the stove, not have as many showers and are outside a lot during the day therefore less electricity used. September is the highest quarter it is on average 698 GWH above the normal amount of electricity used. This is because it includes the months July and August these months are our coldest months. As it is so cold outside people will be having more showers, cooking more hot meals, using heaters and staying inside during the day using lots of electric appliances.
In this data there are two main spikes. The data for June 98 is higher than the September 98 this doesn’t follow the seasonal trend. These two should swap around and then would correctly follow the pattern. This may have happened because the June quarter was very cold so more electricity was used than normal and then had to cut back on electricity in the September quarter as they had used too much in June quarter. The other spike is September 01 it I... [continues]
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