Misleading electricity tariff chart
the following is a letter from a TOC reader:
I refer to the recent announcement on the increase in electricity tariff. In major newspapers, SP Services published a chart comparing the prices of fuel oil against the prices of electricity tariffs over time.
The chart is misleading because the tariff axis is over-extended. While the oil price axis ranges up to 180, which just covers the maximum fuel price (155.14 in Oct 08) for the period in comparison, the tariff axis does not follow the same principle of charting. Instead it mirrors the oil price axis, having the top end of the axis range at 180. As a result, the fluctuations in the electricity tariffs are not clearly depicted and it gives a misperception that the electricity tariffs are not rising as much or as fast a rate as the fuel oil price.
To show a better comparison between the electricity tariff and the fuel oil price, I suggest the tariff axis to range up to 35, to just cover the maximum tariff (30.45 in Oct 08). This will show the fluctuations of the electricity tariff vis-a-vis those of the fuel oil price better, graphically.
Keok Tong San